Implement 2D graphic API (#87)

* Implement 2D graphic library based on LittlevGL

* Add lvgl license file

README.md

@@ -247,7 +247,7 @@ Run WASM app
 
 Assume you are using Linux, the command to run the test.wasm is:
 ``` Bash
-cd iwasm/products/linux/bin
+cd iwasm/products/linux/build
 ./iwasm test.wasm
 ```
 You will get the following output:
@@ -363,7 +363,9 @@ void api_timer_restart(user_timer_t timer, int interval);
 ```
 
 **Library extension reference**<br/>
-Currently we provide the sensor API's as one library extension sample. In the header file ```lib/app-libs/extension/sensor/sensor.h```, the API set is defined as below:
+Currently we provide several kinds of extension library for reference including sensor, connection and GUI.
+
+Sensor API: In the header file ```lib/app-libs/extension/sensor/sensor.h```, the API set is defined as below:
 ``` C
 sensor_t sensor_open(const char* name, int index,
                      void(*on_sensor_event)(sensor_t, attr_container_t *, void *),
@@ -372,7 +374,7 @@ bool sensor_config(sensor_t sensor, int interval, int bit_cfg, int delay);
 bool sensor_config_with_attr_container(sensor_t sensor, attr_container_t *cfg);
 bool sensor_close(sensor_t sensor);
 ```
-We provide the connection API's as another sample. In the header file `lib/app-libs/extension/connection/connection.h.`, the API set is defined as below:
+Connection API: In the header file `lib/app-libs/extension/connection/connection.h.`, the API set is defined as below:
 ``` C
 /* Connection event type */
 typedef enum {
@@ -395,6 +397,8 @@ void api_close_connection(connection_t *conn);
 int api_send_on_connection(connection_t *conn, const char *data, uint32 len);
 bool api_config_connection(connection_t *conn, attr_container_t *cfg);
 ```
+GUI API: The API's is list in header file ```lib/app-libs/extension/gui/wgl.h``` which is implemented based open soure 2D graphic library [LittlevGL](https://docs.littlevgl.com/en/html/index.html). Currently supported widgets include button, label, list and check box and more wigdet would be provided in future.
+
 
 The mechanism of exporting native API to WASM application
 =======================================================
@@ -622,7 +626,9 @@ Please refer to the ```samples/simple``` folder for samples of WASM application
 
 2D graphic user interface with LittlevGL
 ------------------------------------------------
-This sample demonstrates that a graphic user interface application in WebAssembly  integrates  the LittlevGL, an open-source embedded 2d graphic library. The sample source code is under ```samples/littlevgl``` 
+We have 2 samples for 2D graphic user interface.
+
+One of them demonstrates that a graphic user interface application in WebAssembly  integrates  the LittlevGL, an open-source embedded 2d graphic library. The sample source code is under ```samples/littlevgl``` 
 
 In this sample, the LittlevGL source code is built into the WebAssembly code with the user application source files. The platform interfaces defined by LittlevGL is implemented in the runtime and exported to the application through the declarations from source "ext_lib_export.c" as below:
 
@@ -645,6 +651,10 @@ Below pictures show the WASM application is running on an STM board with an LCD
 The sample also provides the native Linux version of application without the runtime under folder "vgl-native-ui-app". It can help to check differences between the implementations in native and WebAssembly.
 <img src="./doc/pics/vgl_linux.PNG">
 
+The other sample demonstrates that a graphic user interface application in WebAssembly programming with WAMR graphic library(WGL), which is implemented based on LittlevGL, an open-source embedded 2d graphic library. The sample source code is under ```samples/gui```
+
+Unlike `sample/littlevgl/val-wasm-runtime`, in this sample, the  LittlevGL source code is built into the WAMR runtime and exported to Webassembly applicaton but not directly built into Webassembly application. And WGL provides a group of WebAssembly wrapper API's for user to write graphic application. These API's are listed in: `<wamr_root>/core/iwasm/lib/app-libs/extension/gui/wgl.h`. Currently only a few API's are provided and there will be more.
+
 
 Submit issues and contact the maintainers
 =========================================

core/app-mgr/app-manager/module_wasm_app.h

@@ -43,6 +43,7 @@ enum {
     TIMER_EVENT_WASM,
     SENSOR_EVENT_WASM,
     CONNECTION_EVENT_WASM,
+    WIDGET_EVENT_WASM,
     WASM_Msg_End = WASM_Msg_Start + 100
 };
 

core/iwasm/lib/3rdparty/LICENCE.txt

@@ -0,0 +1,8 @@
+MIT licence
+Copyright (c) 2016 Gábor Kiss-Vámosi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

core/iwasm/lib/3rdparty/lv_conf.h

@@ -0,0 +1,495 @@
+/**
+ * @file lv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS `lv_conf.h` NEXT TO the `lvgl` FOLDER
+ */
+
+#if 1 /*Set it to "1" to enable content*/
+
+#ifndef LV_CONF_H
+#define LV_CONF_H
+/* clang-format off */
+
+#include <stdint.h>
+
+/*====================
+   Graphical settings
+ *====================*/
+
+/* Maximal horizontal and vertical resolution to support by the library.*/
+#define LV_HOR_RES_MAX          (320)
+#define LV_VER_RES_MAX          (240)
+
+/* Color depth:
+ * - 1:  1 byte per pixel
+ * - 8:  RGB233
+ * - 16: RGB565
+ * - 32: ARGB8888
+ */
+#define LV_COLOR_DEPTH     32
+
+/* Swap the 2 bytes of RGB565 color.
+ * Useful if the display has a 8 bit interface (e.g. SPI)*/
+#define LV_COLOR_16_SWAP   0
+
+/* 1: Enable screen transparency.
+ * Useful for OSD or other overlapping GUIs.
+ * Requires `LV_COLOR_DEPTH = 32` colors and the screen's style should be modified: `style.body.opa = ...`*/
+#define LV_COLOR_SCREEN_TRANSP    0
+
+/*Images pixels with this color will not be drawn (with chroma keying)*/
+#define LV_COLOR_TRANSP    LV_COLOR_LIME         /*LV_COLOR_LIME: pure green*/
+
+/* Enable anti-aliasing (lines, and radiuses will be smoothed) */
+#define LV_ANTIALIAS        1
+
+/* Default display refresh period.
+ * Can be changed in the display driver (`lv_disp_drv_t`).*/
+#define LV_DISP_DEF_REFR_PERIOD      30      /*[ms]*/
+
+/* Dot Per Inch: used to initialize default sizes.
+ * E.g. a button with width = LV_DPI / 2 -> half inch wide
+ * (Not so important, you can adjust it to modify default sizes and spaces)*/
+#define LV_DPI              100     /*[px]*/
+
+/* Type of coordinates. Should be `int16_t` (or `int32_t` for extreme cases) */
+typedef int16_t lv_coord_t;
+
+/*=========================
+   Memory manager settings
+ *=========================*/
+
+/* LittelvGL's internal memory manager's settings.
+ * The graphical objects and other related data are stored here. */
+
+/* 1: use custom malloc/free, 0: use the built-in `lv_mem_alloc` and `lv_mem_free` */
+#define LV_MEM_CUSTOM      1
+#if LV_MEM_CUSTOM == 0
+/* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
+#  define LV_MEM_SIZE    (128U * 1024U)
+
+/* Complier prefix for a big array declaration */
+#  define LV_MEM_ATTR
+
+/* Set an address for the memory pool instead of allocating it as an array.
+ * Can be in external SRAM too. */
+#  define LV_MEM_ADR          0
+
+/* Automatically defrag. on free. Defrag. means joining the adjacent free cells. */
+#  define LV_MEM_AUTO_DEFRAG  1
+#else       /*LV_MEM_CUSTOM*/
+#  define LV_MEM_CUSTOM_INCLUDE "bh_memory.h"   /*Header for the dynamic memory function*/
+#  define LV_MEM_CUSTOM_ALLOC   bh_malloc       /*Wrapper to malloc*/
+#  define LV_MEM_CUSTOM_FREE    bh_free         /*Wrapper to free*/
+#endif     /*LV_MEM_CUSTOM*/
+
+/* Garbage Collector settings
+ * Used if lvgl is binded to higher level language and the memory is managed by that language */
+#define LV_ENABLE_GC 0
+#if LV_ENABLE_GC != 0
+#  define LV_GC_INCLUDE "gc.h"                           /*Include Garbage Collector related things*/
+#  define LV_MEM_CUSTOM_REALLOC   your_realloc           /*Wrapper to realloc*/
+#  define LV_MEM_CUSTOM_GET_SIZE  your_mem_get_size      /*Wrapper to lv_mem_get_size*/
+#endif /* LV_ENABLE_GC */
+
+/*=======================
+   Input device settings
+ *=======================*/
+
+/* Input device default settings.
+ * Can be changed in the Input device driver (`lv_indev_drv_t`)*/
+
+/* Input device read period in milliseconds */
+#define LV_INDEV_DEF_READ_PERIOD          30
+
+/* Drag threshold in pixels */
+#define LV_INDEV_DEF_DRAG_LIMIT           10
+
+/* Drag throw slow-down in [%]. Greater value -> faster slow-down */
+#define LV_INDEV_DEF_DRAG_THROW           20
+
+/* Long press time in milliseconds.
+ * Time to send `LV_EVENT_LONG_PRESSSED`) */
+#define LV_INDEV_DEF_LONG_PRESS_TIME      400
+
+/* Repeated trigger period in long press [ms]
+ * Time between `LV_EVENT_LONG_PRESSED_REPEAT */
+#define LV_INDEV_DEF_LONG_PRESS_REP_TIME  100
+
+/*==================
+ * Feature usage
+ *==================*/
+
+/*1: Enable the Animations */
+#define LV_USE_ANIMATION        1
+#if LV_USE_ANIMATION
+
+/*Declare the type of the user data of animations (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_anim_user_data_t;
+
+#endif
+
+/* 1: Enable shadow drawing*/
+#define LV_USE_SHADOW           1
+
+/* 1: Enable object groups (for keyboard/encoder navigation) */
+#define LV_USE_GROUP            0
+#if LV_USE_GROUP
+typedef void * lv_group_user_data_t;
+#endif  /*LV_USE_GROUP*/
+
+/* 1: Enable GPU interface*/
+#define LV_USE_GPU              1
+
+/* 1: Enable file system (might be required for images */
+#define LV_USE_FILESYSTEM       1
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_fs_drv_user_data_t;
+#endif
+
+/*1: Add a `user_data` to drivers and objects*/
+#define LV_USE_USER_DATA        0
+
+/*========================
+ * Image decoder and cache
+ *========================*/
+
+/* 1: Enable indexed (palette) images */
+#define LV_IMG_CF_INDEXED       1
+
+/* 1: Enable alpha indexed images */
+#define LV_IMG_CF_ALPHA         1
+
+/* Default image cache size. Image caching keeps the images opened.
+ * If only the built-in image formats are used there is no real advantage of caching.
+ * (I.e. no new image decoder is added)
+ * With complex image decoders (e.g. PNG or JPG) caching can save the continuous open/decode of images.
+ * However the opened images might consume additional RAM.
+ * LV_IMG_CACHE_DEF_SIZE must be >= 1 */
+#define LV_IMG_CACHE_DEF_SIZE       1
+
+/*Declare the type of the user data of image decoder (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_img_decoder_user_data_t;
+
+/*=====================
+ *  Compiler settings
+ *====================*/
+/* Define a custom attribute to `lv_tick_inc` function */
+#define LV_ATTRIBUTE_TICK_INC
+
+/* Define a custom attribute to `lv_task_handler` function */
+#define LV_ATTRIBUTE_TASK_HANDLER
+
+/* With size optimization (-Os) the compiler might not align data to
+ * 4 or 8 byte boundary. This alignment will be explicitly applied where needed.
+ * E.g. __attribute__((aligned(4))) */
+#define LV_ATTRIBUTE_MEM_ALIGN
+
+/* Attribute to mark large constant arrays for example
+ * font's bitmaps */
+#define LV_ATTRIBUTE_LARGE_CONST
+
+/*===================
+ *  HAL settings
+ *==================*/
+
+/* 1: use a custom tick source.
+ * It removes the need to manually update the tick with `lv_tick_inc`) */
+#define LV_TICK_CUSTOM     1
+#if LV_TICK_CUSTOM == 1
+#define LV_TICK_CUSTOM_INCLUDE  "bh_time.h"       /*Header for the sys time function*/
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (_bh_time_get_boot_millisecond())     /*Expression evaluating to current systime in ms*/
+#endif   /*LV_TICK_CUSTOM*/
+
+typedef void * lv_disp_drv_user_data_t;             /*Type of user data in the display driver*/
+typedef void * lv_indev_drv_user_data_t;            /*Type of user data in the input device driver*/
+
+/*================
+ * Log settings
+ *===============*/
+
+/*1: Enable the log module*/
+#define LV_USE_LOG      1
+#if LV_USE_LOG
+/* How important log should be added:
+ * LV_LOG_LEVEL_TRACE       A lot of logs to give detailed information
+ * LV_LOG_LEVEL_INFO        Log important events
+ * LV_LOG_LEVEL_WARN        Log if something unwanted happened but didn't cause a problem
+ * LV_LOG_LEVEL_ERROR       Only critical issue, when the system may fail
+ * LV_LOG_LEVEL_NONE        Do not log anything
+ */
+#  define LV_LOG_LEVEL    LV_LOG_LEVEL_WARN
+
+/* 1: Print the log with 'printf';
+ * 0: user need to register a callback with `lv_log_register_print`*/
+#  define LV_LOG_PRINTF   1
+#endif  /*LV_USE_LOG*/
+
+/*================
+ *  THEME USAGE
+ *================*/
+#define LV_THEME_LIVE_UPDATE    1   /*1: Allow theme switching at run time. Uses 8..10 kB of RAM*/
+
+#define LV_USE_THEME_TEMPL      1   /*Just for test*/
+#define LV_USE_THEME_DEFAULT    1   /*Built mainly from the built-in styles. Consumes very few RAM*/
+#define LV_USE_THEME_ALIEN      1   /*Dark futuristic theme*/
+#define LV_USE_THEME_NIGHT      1   /*Dark elegant theme*/
+#define LV_USE_THEME_MONO       1   /*Mono color theme for monochrome displays*/
+#define LV_USE_THEME_MATERIAL   1   /*Flat theme with bold colors and light shadows*/
+#define LV_USE_THEME_ZEN        1   /*Peaceful, mainly light theme */
+#define LV_USE_THEME_NEMO       1   /*Water-like theme based on the movie "Finding Nemo"*/
+
+/*==================
+ *    FONT USAGE
+ *===================*/
+
+/* The built-in fonts contains the ASCII range and some Symbols with  4 bit-per-pixel.
+ * The symbols are available via `LV_SYMBOL_...` defines
+ * More info about fonts: https://docs.littlevgl.com/#Fonts
+ * To create a new font go to: https://littlevgl.com/ttf-font-to-c-array
+ */
+
+/* Robot fonts with bpp = 4
+ * https://fonts.google.com/specimen/Roboto  */
+#define LV_FONT_ROBOTO_12    1
+#define LV_FONT_ROBOTO_16    1
+#define LV_FONT_ROBOTO_22    1
+#define LV_FONT_ROBOTO_28    1
+
+/*Pixel perfect monospace font
+ * http://pelulamu.net/unscii/ */
+#define LV_FONT_UNSCII_8     1
+
+/* Optionally declare your custom fonts here.
+ * You can use these fonts as default font too
+ * and they will be available globally. E.g.
+ * #define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(my_font_1) \
+ *                                LV_FONT_DECLARE(my_font_2)
+ */
+#define LV_FONT_CUSTOM_DECLARE
+
+/*Always set a default font from the built-in fonts*/
+#define LV_FONT_DEFAULT        &lv_font_roboto_16
+
+/* Enable it if you have fonts with a lot of characters.
+ * The limit depends on the font size, font face and bpp
+ * but with > 10,000 characters if you see issues probably you need to enable it.*/
+#define LV_FONT_FMT_TXT_LARGE   1
+
+/*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_font_user_data_t;
+
+/*=================
+ *  Text settings
+ *=================*/
+
+/* Select a character encoding for strings.
+ * Your IDE or editor should have the same character encoding
+ * - LV_TXT_ENC_UTF8
+ * - LV_TXT_ENC_ASCII
+ * */
+#define LV_TXT_ENC LV_TXT_ENC_UTF8
+
+ /*Can break (wrap) texts on these chars*/
+#define LV_TXT_BREAK_CHARS                  " ,.;:-_"
+
+/*===================
+ *  LV_OBJ SETTINGS
+ *==================*/
+
+/*Declare the type of the user data of object (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_obj_user_data_t;
+
+/*1: enable `lv_obj_realaign()` based on `lv_obj_align()` parameters*/
+#define LV_USE_OBJ_REALIGN          1
+
+/* Enable to make the object clickable on a larger area.
+ * LV_EXT_CLICK_AREA_OFF or 0: Disable this feature
+ * LV_EXT_CLICK_AREA_TINY: The extra area can be adjusted horizontally and vertically (0..255 px)
+ * LV_EXT_CLICK_AREA_FULL: The extra area can be adjusted in all 4 directions (-32k..+32k px)
+ */
+#define LV_USE_EXT_CLICK_AREA  LV_EXT_CLICK_AREA_FULL
+
+/*==================
+ *  LV OBJ X USAGE
+ *================*/
+/*
+ * Documentation of the object types: https://docs.littlevgl.com/#Object-types
+ */
+
+/*Arc (dependencies: -)*/
+#define LV_USE_ARC      1
+
+/*Bar (dependencies: -)*/
+#define LV_USE_BAR      1
+
+/*Button (dependencies: lv_cont*/
+#define LV_USE_BTN      1
+#if LV_USE_BTN != 0
+/*Enable button-state animations - draw a circle on click (dependencies: LV_USE_ANIMATION)*/
+#  define LV_BTN_INK_EFFECT   1
+#endif
+
+/*Button matrix (dependencies: -)*/
+#define LV_USE_BTNM     1
+
+/*Calendar (dependencies: -)*/
+#define LV_USE_CALENDAR 1
+
+/*Canvas (dependencies: lv_img)*/
+#define LV_USE_CANVAS   1
+
+/*Check box (dependencies: lv_btn, lv_label)*/
+#define LV_USE_CB       1
+
+/*Chart (dependencies: -)*/
+#define LV_USE_CHART    1
+#if LV_USE_CHART
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    20
+#endif
+
+/*Container (dependencies: -*/
+#define LV_USE_CONT     1
+
+/*Drop down list (dependencies: lv_page, lv_label, lv_symbol_def.h)*/
+#define LV_USE_DDLIST    1
+#if LV_USE_DDLIST != 0
+/*Open and close default animation time [ms] (0: no animation)*/
+#  define LV_DDLIST_DEF_ANIM_TIME     200
+#endif
+
+/*Gauge (dependencies:lv_bar, lv_lmeter)*/
+#define LV_USE_GAUGE    1
+
+/*Image (dependencies: lv_label*/
+#define LV_USE_IMG      1
+
+/*Image Button (dependencies: lv_btn*/
+#define LV_USE_IMGBTN   1
+#if LV_USE_IMGBTN
+/*1: The imgbtn requires left, mid and right parts and the width can be set freely*/
+#  define LV_IMGBTN_TILED 0
+#endif
+
+/*Keyboard (dependencies: lv_btnm)*/
+#define LV_USE_KB       1
+
+/*Label (dependencies: -*/
+#define LV_USE_LABEL    1
+#if LV_USE_LABEL != 0
+/*Hor, or ver. scroll speed [px/sec] in 'LV_LABEL_LONG_ROLL/ROLL_CIRC' mode*/
+#  define LV_LABEL_DEF_SCROLL_SPEED       25
+
+/* Waiting period at beginning/end of animation cycle */
+#  define LV_LABEL_WAIT_CHAR_COUNT        3
+
+/*Enable selecting text of the label */
+#  define LV_LABEL_TEXT_SEL               1
+
+/*Store extra some info in labels (12 bytes) to speed up drawing of very long texts*/
+#  define LV_LABEL_LONG_TXT_HINT          0
+#endif
+
+/*LED (dependencies: -)*/
+#define LV_USE_LED      1
+
+/*Line (dependencies: -*/
+#define LV_USE_LINE     1
+
+/*List (dependencies: lv_page, lv_btn, lv_label, (lv_img optionally for icons ))*/
+#define LV_USE_LIST     1
+#if LV_USE_LIST != 0
+/*Default animation time of focusing to a list element [ms] (0: no animation)  */
+#  define LV_LIST_DEF_ANIM_TIME  100
+#endif
+
+/*Line meter (dependencies: *;)*/
+#define LV_USE_LMETER   1
+
+/*Message box (dependencies: lv_rect, lv_btnm, lv_label)*/
+#define LV_USE_MBOX     1
+
+/*Page (dependencies: lv_cont)*/
+#define LV_USE_PAGE     1
+#if LV_USE_PAGE != 0
+/*Focus default animation time [ms] (0: no animation)*/
+#  define LV_PAGE_DEF_ANIM_TIME     400
+#endif
+
+/*Preload (dependencies: lv_arc, lv_anim)*/
+#define LV_USE_PRELOAD      1
+#if LV_USE_PRELOAD != 0
+#  define LV_PRELOAD_DEF_ARC_LENGTH   60      /*[deg]*/
+#  define LV_PRELOAD_DEF_SPIN_TIME    1000    /*[ms]*/
+#  define LV_PRELOAD_DEF_ANIM         LV_PRELOAD_TYPE_SPINNING_ARC
+#endif
+
+/*Roller (dependencies: lv_ddlist)*/
+#define LV_USE_ROLLER    1
+#if LV_USE_ROLLER != 0
+/*Focus animation time [ms] (0: no animation)*/
+#  define LV_ROLLER_DEF_ANIM_TIME     200
+
+/*Number of extra "pages" when the roller is infinite*/
+#  define LV_ROLLER_INF_PAGES         7
+#endif
+
+/*Slider (dependencies: lv_bar)*/
+#define LV_USE_SLIDER    1
+
+/*Spinbox (dependencies: lv_ta)*/
+#define LV_USE_SPINBOX       1
+
+/*Switch (dependencies: lv_slider)*/
+#define LV_USE_SW       1
+
+/*Text area (dependencies: lv_label, lv_page)*/
+#define LV_USE_TA       1
+#if LV_USE_TA != 0
+#  define LV_TA_DEF_CURSOR_BLINK_TIME 400     /*ms*/
+#  define LV_TA_DEF_PWD_SHOW_TIME     1500    /*ms*/
+#endif
+
+/*Table (dependencies: lv_label)*/
+#define LV_USE_TABLE    1
+#if LV_USE_TABLE
+#  define LV_TABLE_COL_MAX    12
+#endif
+
+/*Tab (dependencies: lv_page, lv_btnm)*/
+#define LV_USE_TABVIEW      1
+#  if LV_USE_TABVIEW != 0
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TABVIEW_DEF_ANIM_TIME    300
+#endif
+
+/*Tileview (dependencies: lv_page) */
+#define LV_USE_TILEVIEW     1
+#if LV_USE_TILEVIEW
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TILEVIEW_DEF_ANIM_TIME   300
+#endif
+
+/*Window (dependencies: lv_cont, lv_btn, lv_label, lv_img, lv_page)*/
+#define LV_USE_WIN      1
+
+/*==================
+ * Non-user section
+ *==================*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)    /* Disable warnings for Visual Studio*/
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
+/*--END OF LV_CONF_H--*/
+
+/*Be sure every define has a default value*/
+#include "lvgl/src/lv_conf_checker.h"
+
+#endif /*LV_CONF_H*/
+
+#endif /*End of "Content enable"*/

core/iwasm/lib/app-libs/base/wasm_app.h

@@ -39,6 +39,7 @@
 #include "sensor.h"
 #include "connection.h"
 #include "timer_wasm_app.h"
+#include "wgl.h"
 
 #ifdef __cplusplus
 extern "C" {

core/iwasm/lib/app-libs/extension/gui/inc/LICENCE.txt

@@ -0,0 +1,8 @@
+MIT licence
+Copyright (c) 2016 Gábor Kiss-Vámosi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

core/iwasm/lib/app-libs/extension/gui/inc/wgl_btn.h

@@ -0,0 +1,173 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_BTN_H
+#define WAMR_GRAPHIC_LIBRARY_BTN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Possible states of a button.
+ * It can be used not only by buttons but other button-like objects too*/
+enum {
+    /**Released*/
+    WGL_BTN_STATE_REL,
+
+    /**Pressed*/
+    WGL_BTN_STATE_PR,
+
+    /**Toggled released*/
+    WGL_BTN_STATE_TGL_REL,
+
+    /**Toggled pressed*/
+    WGL_BTN_STATE_TGL_PR,
+
+    /**Inactive*/
+    WGL_BTN_STATE_INA,
+
+    /**Number of states*/
+    _WGL_BTN_STATE_NUM,
+};
+typedef uint8_t wgl_btn_state_t;
+
+/**Styles*/
+enum {
+    /** Release style */
+    WGL_BTN_STYLE_REL,
+
+    /**Pressed style*/
+    WGL_BTN_STYLE_PR,
+
+    /** Toggle released style*/
+    WGL_BTN_STYLE_TGL_REL,
+
+    /** Toggle pressed style */
+    WGL_BTN_STYLE_TGL_PR,
+
+    /** Inactive style*/
+    WGL_BTN_STYLE_INA,
+};
+typedef uint8_t wgl_btn_style_t;
+
+
+/* Create a button */
+wgl_obj_t wgl_btn_create(wgl_obj_t par, wgl_obj_t copy);
+
+/*=====================
+ * Setter functions
+ *====================*/
+
+/**
+ * Enable the toggled states. On release the button will change from/to toggled state.
+ * @param btn pointer to a button object
+ * @param tgl true: enable toggled states, false: disable
+ */
+void wgl_btn_set_toggle(wgl_obj_t btn, bool tgl);
+
+/**
+ * Set the state of the button
+ * @param btn pointer to a button object
+ * @param state the new state of the button (from wgl_btn_state_t enum)
+ */
+void wgl_btn_set_state(wgl_obj_t btn, wgl_btn_state_t state);
+
+/**
+ * Toggle the state of the button (ON->OFF, OFF->ON)
+ * @param btn pointer to a button object
+ */
+void wgl_btn_toggle(wgl_obj_t btn);
+
+/**
+ * Set time of the ink effect (draw a circle on click to animate in the new state)
+ * @param btn pointer to a button object
+ * @param time the time of the ink animation
+ */
+void wgl_btn_set_ink_in_time(wgl_obj_t btn, uint16_t time);
+
+/**
+ * Set the wait time before the ink disappears
+ * @param btn pointer to a button object
+ * @param time the time of the ink animation
+ */
+void wgl_btn_set_ink_wait_time(wgl_obj_t btn, uint16_t time);
+
+/**
+ * Set time of the ink out effect (animate to the released state)
+ * @param btn pointer to a button object
+ * @param time the time of the ink animation
+ */
+void wgl_btn_set_ink_out_time(wgl_obj_t btn, uint16_t time);
+
+/**
+ * Set a style of a button.
+ * @param btn pointer to button object
+ * @param type which style should be set
+ * @param style pointer to a style
+ *  */
+//void wgl_btn_set_style(wgl_obj_t btn, wgl_btn_style_t type, const wgl_style_t * style);
+
+/*=====================
+ * Getter functions
+ *====================*/
+
+/**
+ * Get the current state of the button
+ * @param btn pointer to a button object
+ * @return the state of the button (from wgl_btn_state_t enum)
+ */
+wgl_btn_state_t wgl_btn_get_state(wgl_obj_t btn);
+
+/**
+ * Get the toggle enable attribute of the button
+ * @param btn pointer to a button object
+ * @return true: toggle enabled, false: disabled
+ */
+bool wgl_btn_get_toggle(wgl_obj_t btn);
+
+/**
+ * Get time of the ink in effect (draw a circle on click to animate in the new state)
+ * @param btn pointer to a button object
+ * @return the time of the ink animation
+ */
+uint16_t wgl_btn_get_ink_in_time(wgl_obj_t btn);
+
+/**
+ * Get the wait time before the ink disappears
+ * @param btn pointer to a button object
+ * @return the time of the ink animation
+ */
+uint16_t wgl_btn_get_ink_wait_time(wgl_obj_t btn);
+
+/**
+ * Get time of the ink out effect (animate to the releases state)
+ * @param btn pointer to a button object
+ * @return the time of the ink animation
+ */
+uint16_t wgl_btn_get_ink_out_time(wgl_obj_t btn);
+
+/**
+ * Get style of a button.
+ * @param btn pointer to button object
+ * @param type which style should be get
+ * @return style pointer to the style
+ *  */
+//const wgl_style_t * wgl_btn_get_style(const wgl_obj_t btn, wgl_btn_style_t type);
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_BTN_H */

core/iwasm/lib/app-libs/extension/gui/inc/wgl_cb.h

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_CB_H
+#define WAMR_GRAPHIC_LIBRARY_CB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Checkbox styles. */
+enum {
+    WGL_CB_STYLE_BG, /**< Style of object background. */
+    WGL_CB_STYLE_BOX_REL, /**< Style of box (released). */
+    WGL_CB_STYLE_BOX_PR, /**< Style of box (pressed). */
+    WGL_CB_STYLE_BOX_TGL_REL, /**< Style of box (released but checked). */
+    WGL_CB_STYLE_BOX_TGL_PR, /**< Style of box (pressed and checked). */
+    WGL_CB_STYLE_BOX_INA, /**< Style of disabled box */
+};
+typedef uint8_t wgl_cb_style_t;
+
+
+/**
+ * Create a check box objects
+ * @param par pointer to an object, it will be the parent of the new check box
+ * @param copy pointer to a check box object, if not NULL then the new object will be copied from it
+ * @return pointer to the created check box
+ */
+wgl_obj_t wgl_cb_create(wgl_obj_t par, const wgl_obj_t copy);
+
+/*=====================
+ * Setter functions
+ *====================*/
+
+/**
+ * Set the text of a check box. `txt` will be copied and may be deallocated
+ * after this function returns.
+ * @param cb pointer to a check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
+ */
+void wgl_cb_set_text(wgl_obj_t cb, const char * txt);
+
+/**
+ * Set the text of a check box. `txt` must not be deallocated during the life
+ * of this checkbox.
+ * @param cb pointer to a check box
+ * @param txt the text of the check box. NULL to refresh with the current text.
+ */
+void wgl_cb_set_static_text(wgl_obj_t cb, const char * txt);
+
+
+/*=====================
+ * Getter functions
+ *====================*/
+
+
+/**
+ * Get the length of the text of a check box
+ * @param label the check box object
+ * @return the length of the text of the check box
+ */
+unsigned int wgl_cb_get_text_length(wgl_obj_t cb);
+
+/**
+ * Get the text of a check box
+ * @param label the check box object
+ * @param buffer buffer to save the text
+ * @param buffer_len length of the buffer
+ * @return the text of the check box, note that the text will be truncated if buffer is not long enough
+ */
+char *wgl_cb_get_text(wgl_obj_t cb, char *buffer, int buffer_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_CB_H */

core/iwasm/lib/app-libs/extension/gui/inc/wgl_label.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_LABEL_H
+#define WAMR_GRAPHIC_LIBRARY_LABEL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Long mode behaviors. Used in 'wgl_label_ext_t' */
+enum {
+    WGL_LABEL_LONG_EXPAND,    /**< Expand the object size to the text size*/
+    WGL_LABEL_LONG_BREAK,     /**< Keep the object width, break the too long lines and expand the object
+                                height*/
+    WGL_LABEL_LONG_DOT,       /**< Keep the size and write dots at the end if the text is too long*/
+    WGL_LABEL_LONG_SROLL,      /**< Keep the size and roll the text back and forth*/
+    WGL_LABEL_LONG_SROLL_CIRC, /**< Keep the size and roll the text circularly*/
+    WGL_LABEL_LONG_CROP,      /**< Keep the size and crop the text out of it*/
+};
+typedef uint8_t wgl_label_long_mode_t;
+
+/** Label align policy*/
+enum {
+    WGL_LABEL_ALIGN_LEFT, /**< Align text to left */
+    WGL_LABEL_ALIGN_CENTER, /**< Align text to center */
+    WGL_LABEL_ALIGN_RIGHT, /**< Align text to right */
+};
+typedef uint8_t wgl_label_align_t;
+
+/** Label styles*/
+enum {
+    WGL_LABEL_STYLE_MAIN,
+};
+typedef uint8_t wgl_label_style_t;
+
+/* Create a label */
+wgl_obj_t wgl_label_create(wgl_obj_t par, wgl_obj_t copy);
+
+/* Set text for the label */
+void wgl_label_set_text(wgl_obj_t label, const char * text);
+
+/**
+ * Get the length of the text of a label
+ * @param label the label object
+ * @return the length of the text of the label
+ */
+unsigned int wgl_label_get_text_length(wgl_obj_t label);
+
+/**
+ * Get the text of a label
+ * @param label the label object
+ * @param buffer buffer to save the text
+ * @param buffer_len length of the buffer
+ * @return the text of the label, note that the text will be truncated if buffer is not long enough
+ */
+char *wgl_label_get_text(wgl_obj_t label, char *buffer, int buffer_len);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_LABEL_H */

core/iwasm/lib/app-libs/extension/gui/inc/wgl_list.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_LIST_H
+#define WAMR_GRAPHIC_LIBRARY_LIST_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** List styles. */
+enum {
+    WGL_LIST_STYLE_BG, /**< List background style */
+    WGL_LIST_STYLE_SCRL, /**< List scrollable area style. */
+    WGL_LIST_STYLE_SB, /**< List scrollbar style. */
+    WGL_LIST_STYLE_EDGE_FLASH, /**< List edge flash style. */
+    WGL_LIST_STYLE_BTN_REL, /**< Same meaning as the ordinary button styles. */
+    WGL_LIST_STYLE_BTN_PR,
+    WGL_LIST_STYLE_BTN_TGL_REL,
+    WGL_LIST_STYLE_BTN_TGL_PR,
+    WGL_LIST_STYLE_BTN_INA,
+};
+typedef uint8_t wgl_list_style_t;
+
+
+/**
+ * Create a list objects
+ * @param par pointer to an object, it will be the parent of the new list
+ * @param copy pointer to a list object, if not NULL then the new object will be copied from it
+ * @return pointer to the created list
+ */
+wgl_obj_t wgl_list_create(wgl_obj_t par, wgl_obj_t copy);
+
+
+/*======================
+ * Add/remove functions
+ *=====================*/
+
+/**
+ * Add a list element to the list
+ * @param list pointer to list object
+ * @param img_fn file name of an image before the text (NULL if unused)
+ * @param txt text of the list element (NULL if unused)
+ * @return pointer to the new list element which can be customized (a button)
+ */
+wgl_obj_t wgl_list_add_btn(wgl_obj_t list, const void * img_src, const char * txt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_LIST_H */

core/iwasm/lib/app-libs/extension/gui/inc/wgl_obj.h

@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_OBJ_H
+#define WAMR_GRAPHIC_LIBRARY_OBJ_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void * wgl_obj_t;
+
+enum {
+    WGL_EVENT_PRESSED,             /**< The object has been pressed*/
+    WGL_EVENT_PRESSING,            /**< The object is being pressed (called continuously while pressing)*/
+    WGL_EVENT_PRESS_LOST,          /**< User is still pressing but slid cursor/finger off of the object */
+    WGL_EVENT_SHORT_CLICKED,       /**< User pressed object for a short period of time, then released it. Not called if dragged. */
+    WGL_EVENT_LONG_PRESSED,        /**< Object has been pressed for at least `WGL_INDEV_LONG_PRESS_TIME`.  Not called if dragged.*/
+    WGL_EVENT_LONG_PRESSED_REPEAT, /**< Called after `WGL_INDEV_LONG_PRESS_TIME` in every
+                                       `WGL_INDEV_LONG_PRESS_REP_TIME` ms.  Not called if dragged.*/
+    WGL_EVENT_CLICKED,             /**< Called on release if not dragged (regardless to long press)*/
+    WGL_EVENT_RELEASED,            /**< Called in every cases when the object has been released*/
+    WGL_EVENT_DRAG_BEGIN,
+    WGL_EVENT_DRAG_END,
+    WGL_EVENT_DRAG_THROW_BEGIN,
+    WGL_EVENT_KEY,
+    WGL_EVENT_FOCUSED,
+    WGL_EVENT_DEFOCUSED,
+    WGL_EVENT_VALUE_CHANGED,      /**< The object's value has changed (i.e. slider moved) */
+    WGL_EVENT_INSERT,
+    WGL_EVENT_REFRESH,
+    WGL_EVENT_APPLY,  /**< "Ok", "Apply" or similar specific button has clicked*/
+    WGL_EVENT_CANCEL, /**< "Close", "Cancel" or similar specific button has clicked*/
+    WGL_EVENT_DELETE, /**< Object is being deleted */
+};
+typedef uint8_t wgl_event_t; /**< Type of event being sent to the object. */
+
+
+/** Object alignment. */
+enum {
+    WGL_ALIGN_CENTER = 0,
+    WGL_ALIGN_IN_TOP_LEFT,
+    WGL_ALIGN_IN_TOP_MID,
+    WGL_ALIGN_IN_TOP_RIGHT,
+    WGL_ALIGN_IN_BOTTOM_LEFT,
+    WGL_ALIGN_IN_BOTTOM_MID,
+    WGL_ALIGN_IN_BOTTOM_RIGHT,
+    WGL_ALIGN_IN_LEFT_MID,
+    WGL_ALIGN_IN_RIGHT_MID,
+    WGL_ALIGN_OUT_TOP_LEFT,
+    WGL_ALIGN_OUT_TOP_MID,
+    WGL_ALIGN_OUT_TOP_RIGHT,
+    WGL_ALIGN_OUT_BOTTOM_LEFT,
+    WGL_ALIGN_OUT_BOTTOM_MID,
+    WGL_ALIGN_OUT_BOTTOM_RIGHT,
+    WGL_ALIGN_OUT_LEFT_TOP,
+    WGL_ALIGN_OUT_LEFT_MID,
+    WGL_ALIGN_OUT_LEFT_BOTTOM,
+    WGL_ALIGN_OUT_RIGHT_TOP,
+    WGL_ALIGN_OUT_RIGHT_MID,
+    WGL_ALIGN_OUT_RIGHT_BOTTOM,
+};
+typedef uint8_t wgl_align_t;
+
+
+enum {
+    WGL_DRAG_DIR_HOR = 0x1, /**< Object can be dragged horizontally. */
+    WGL_DRAG_DIR_VER = 0x2, /**< Object can be dragged vertically. */
+    WGL_DRAG_DIR_ALL = 0x3, /**< Object can be dragged in all directions. */
+};
+
+typedef uint8_t wgl_drag_dir_t;
+
+typedef void (*wgl_event_cb_t)(wgl_obj_t obj, wgl_event_t event);
+
+void wgl_obj_align(wgl_obj_t obj, wgl_obj_t base, wgl_align_t align, wgl_coord_t x_mod, wgl_coord_t y_mod);
+void wgl_obj_set_event_cb(wgl_obj_t obj, wgl_event_cb_t event_cb);
+wgl_res_t wgl_obj_del(wgl_obj_t obj);
+void wgl_obj_del_async(wgl_obj_t obj);
+void wgl_obj_clean(wgl_obj_t obj);
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_OBJ_H */

core/iwasm/lib/app-libs/extension/gui/inc/wgl_types.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_TYPES_H
+#define WAMR_GRAPHIC_LIBRARY_TYPES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+/**
+ * WGL error codes.
+ */
+enum {
+    WGL_RES_INV = 0, /*Typically indicates that the object is deleted (become invalid) in the action
+                       function or an operation was failed*/
+    WGL_RES_OK,      /*The object is valid (no deleted) after the action*/
+};
+typedef uint8_t wgl_res_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_TYPES_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/LICENCE.txt

@@ -0,0 +1,8 @@
+MIT licence
+Copyright (c) 2016 Gábor Kiss-Vámosi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_btn.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_BTN_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_BTN_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_btn.h"
+
+/** Possible states of a button.
+ * It can be used not only by buttons but other button-like objects too*/
+enum {
+    /**Released*/
+    LV_BTN_STATE_REL,
+
+    /**Pressed*/
+    LV_BTN_STATE_PR,
+
+    /**Toggled released*/
+    LV_BTN_STATE_TGL_REL,
+
+    /**Toggled pressed*/
+    LV_BTN_STATE_TGL_PR,
+
+    /**Inactive*/
+    LV_BTN_STATE_INA,
+
+    /**Number of states*/
+    _LV_BTN_STATE_NUM,
+};
+typedef wgl_btn_state_t lv_btn_state_t;
+
+/**Styles*/
+enum {
+    /** Release style */
+    LV_BTN_STYLE_REL,
+
+    /**Pressed style*/
+    LV_BTN_STYLE_PR,
+
+    /** Toggle released style*/
+    LV_BTN_STYLE_TGL_REL,
+
+    /** Toggle pressed style */
+    LV_BTN_STYLE_TGL_PR,
+
+    /** Inactive style*/
+    LV_BTN_STYLE_INA,
+};
+typedef wgl_btn_style_t lv_btn_style_t;
+
+
+#define lv_btn_create wgl_btn_create
+#define lv_btn_set_toggle wgl_btn_set_toggle
+#define lv_btn_set_state wgl_btn_set_state
+#define lv_btn_toggle wgl_btn_toggle
+#define lv_btn_set_ink_in_time wgl_btn_set_ink_in_time
+#define lv_btn_set_ink_wait_time wgl_btn_set_ink_wait_time
+#define lv_btn_set_ink_out_time wgl_btn_set_ink_out_time
+#define lv_btn_get_state wgl_btn_get_state
+#define lv_btn_get_toggle wgl_btn_get_toggle
+#define lv_btn_get_ink_in_time wgl_btn_get_ink_in_time
+#define lv_btn_get_ink_wait_time wgl_btn_get_ink_wait_time
+#define lv_btn_get_ink_out_time wgl_btn_get_ink_out_time
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_BTN_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_cb.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_CB_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_CB_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_cb.h"
+
+/** Checkbox styles. */
+enum {
+    LV_CB_STYLE_BG, /**< Style of object background. */
+    LV_CB_STYLE_BOX_REL, /**< Style of box (released). */
+    LV_CB_STYLE_BOX_PR, /**< Style of box (pressed). */
+    LV_CB_STYLE_BOX_TGL_REL, /**< Style of box (released but checked). */
+    LV_CB_STYLE_BOX_TGL_PR, /**< Style of box (pressed and checked). */
+    LV_CB_STYLE_BOX_INA, /**< Style of disabled box */
+};
+typedef wgl_cb_style_t lv_cb_style_t;
+
+
+#define lv_cb_create wgl_cb_create
+#define lv_cb_set_text wgl_cb_set_text
+#define lv_cb_set_static_text wgl_cb_set_static_text
+#define lv_cb_get_text(cb) wgl_cb_get_text(cb, g_widget_text, 100)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_CB_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_label.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_LABEL_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_LABEL_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_label.h"
+
+/** Long mode behaviors. Used in 'lv_label_ext_t' */
+enum {
+    LV_LABEL_LONG_EXPAND,    /**< Expand the object size to the text size*/
+    LV_LABEL_LONG_BREAK,     /**< Keep the object width, break the too long lines and expand the object
+                                height*/
+    LV_LABEL_LONG_DOT,       /**< Keep the size and write dots at the end if the text is too long*/
+    LV_LABEL_LONG_SROLL,      /**< Keep the size and roll the text back and forth*/
+    LV_LABEL_LONG_SROLL_CIRC, /**< Keep the size and roll the text circularly*/
+    LV_LABEL_LONG_CROP,      /**< Keep the size and crop the text out of it*/
+};
+typedef wgl_label_long_mode_t lv_label_long_mode_t;
+
+/** Label align policy*/
+enum {
+    LV_LABEL_ALIGN_LEFT, /**< Align text to left */
+    LV_LABEL_ALIGN_CENTER, /**< Align text to center */
+    LV_LABEL_ALIGN_RIGHT, /**< Align text to right */
+};
+typedef wgl_label_align_t lv_label_align_t;
+
+/** Label styles*/
+enum {
+    LV_LABEL_STYLE_MAIN,
+};
+typedef wgl_label_style_t lv_label_style_t;
+
+
+#define lv_label_create wgl_label_create
+#define lv_label_set_text wgl_label_set_text
+#define lv_label_get_text(label) wgl_label_get_text(label, g_widget_text, 100)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_LABEL_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_list.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_LIST_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_LIST_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_list.h"
+
+/** List styles. */
+enum {
+    LV_LIST_STYLE_BG, /**< List background style */
+    LV_LIST_STYLE_SCRL, /**< List scrollable area style. */
+    LV_LIST_STYLE_SB, /**< List scrollbar style. */
+    LV_LIST_STYLE_EDGE_FLASH, /**< List edge flash style. */
+    LV_LIST_STYLE_BTN_REL, /**< Same meaning as the ordinary button styles. */
+    LV_LIST_STYLE_BTN_PR,
+    LV_LIST_STYLE_BTN_TGL_REL,
+    LV_LIST_STYLE_BTN_TGL_PR,
+    LV_LIST_STYLE_BTN_INA,
+};
+typedef wgl_list_style_t lv_list_style_t;
+
+
+#define lv_list_create wgl_list_create
+#define lv_list_add_btn wgl_list_add_btn
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_LIST_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_obj.h

@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_OBJ_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_OBJ_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_obj.h"
+
+typedef void lv_obj_t;
+
+enum {
+    LV_EVENT_PRESSED,
+    LV_EVENT_PRESSING,
+    LV_EVENT_PRESS_LOST,
+    LV_EVENT_SHORT_CLICKED,
+    LV_EVENT_LONG_PRESSED,
+    LV_EVENT_LONG_PRESSED_REPEAT,
+    LV_EVENT_CLICKED,
+    LV_EVENT_RELEASED,
+    LV_EVENT_DRAG_BEGIN,
+    LV_EVENT_DRAG_END,
+    LV_EVENT_DRAG_THROW_BEGIN,
+    LV_EVENT_KEY,
+    LV_EVENT_FOCUSED,
+    LV_EVENT_DEFOCUSED,
+    LV_EVENT_VALUE_CHANGED,
+    LV_EVENT_INSERT,
+    LV_EVENT_REFRESH,
+    LV_EVENT_APPLY,
+    LV_EVENT_CANCEL,
+    LV_EVENT_DELETE,
+};
+typedef wgl_event_t lv_event_t;
+
+
+/** Object alignment. */
+enum {
+    LV_ALIGN_CENTER,
+    LV_ALIGN_IN_TOP_LEFT,
+    LV_ALIGN_IN_TOP_MID,
+    LV_ALIGN_IN_TOP_RIGHT,
+    LV_ALIGN_IN_BOTTOM_LEFT,
+    LV_ALIGN_IN_BOTTOM_MID,
+    LV_ALIGN_IN_BOTTOM_RIGHT,
+    LV_ALIGN_IN_LEFT_MID,
+    LV_ALIGN_IN_RIGHT_MID,
+    LV_ALIGN_OUT_TOP_LEFT,
+    LV_ALIGN_OUT_TOP_MID,
+    LV_ALIGN_OUT_TOP_RIGHT,
+    LV_ALIGN_OUT_BOTTOM_LEFT,
+    LV_ALIGN_OUT_BOTTOM_MID,
+    LV_ALIGN_OUT_BOTTOM_RIGHT,
+    LV_ALIGN_OUT_LEFT_TOP,
+    LV_ALIGN_OUT_LEFT_MID,
+    LV_ALIGN_OUT_LEFT_BOTTOM,
+    LV_ALIGN_OUT_RIGHT_TOP,
+    LV_ALIGN_OUT_RIGHT_MID,
+    LV_ALIGN_OUT_RIGHT_BOTTOM,
+};
+typedef wgl_align_t lv_align_t;
+
+
+enum {
+    LV_DRAG_DIR_HOR,
+    LV_DRAG_DIR_VER,
+    LV_DRAG_DIR_ALL,
+};
+
+typedef wgl_drag_dir_t lv_drag_dir_t;
+
+
+#define lv_obj_align wgl_obj_align
+#define lv_obj_set_event_cb wgl_obj_set_event_cb
+#define lv_obj_del wgl_obj_del
+#define lv_obj_del_async wgl_obj_del_async
+#define lv_obj_clean wgl_obj_clean
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_OBJ_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl-compatible/lv_types.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_TYPES_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_TYPES_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../inc/wgl_types.h"
+
+/**
+ * error codes.
+ */
+enum {
+    LV_RES_INV,
+    LV_RES_OK,
+};
+typedef wgl_res_t lv_res_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_TYPES_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/lvgl.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_LVGL_COMPATIBLE_H
+#define WAMR_GRAPHIC_LIBRARY_LVGL_COMPATIBLE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "wgl_shared_utils.h" /* shared types between app and native */
+#include "lvgl-compatible/lv_types.h"
+#include "lvgl-compatible/lv_obj.h"
+#include "lvgl-compatible/lv_btn.h"
+#include "lvgl-compatible/lv_cb.h"
+#include "lvgl-compatible/lv_label.h"
+#include "lvgl-compatible/lv_list.h"
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_LVGL_COMPATIBLE_H */

core/iwasm/lib/app-libs/extension/gui/src/wgl_btn.c

@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wgl.h"
+#include "native_interface.h"
+
+
+#define ARGC sizeof(argv)/sizeof(uint32)
+#define CALL_BTN_NATIVE_FUNC(id) wasm_btn_native_call(id, (int32)argv, ARGC)
+
+wgl_obj_t wgl_btn_create(wgl_obj_t par, wgl_obj_t copy)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)par;
+    argv[1] = (uint32)copy;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_CREATE);
+    return (wgl_obj_t)argv[0];
+}
+
+void wgl_btn_set_toggle(wgl_obj_t btn, bool tgl)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)btn;
+    argv[1] = tgl;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_SET_TOGGLE);
+}
+
+void wgl_btn_set_state(wgl_obj_t btn, wgl_btn_state_t state)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)btn;
+    argv[1] = state;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_SET_STATE);
+}
+
+void wgl_btn_toggle(wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_TOGGLE);
+}
+
+void wgl_btn_set_ink_in_time(wgl_obj_t btn, uint16_t time)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)btn;
+    argv[1] = time;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_SET_INK_IN_TIME);
+}
+
+void wgl_btn_set_ink_wait_time(wgl_obj_t btn, uint16_t time)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)btn;
+    argv[1] = time;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_SET_INK_WAIT_TIME);
+}
+
+void wgl_btn_set_ink_out_time(wgl_obj_t btn, uint16_t time)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)btn;
+    argv[1] = time;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_SET_INK_OUT_TIME);
+}
+
+//void wgl_btn_set_style(wgl_obj_t btn, wgl_btn_style_t type, const wgl_style_t * style)
+//{
+//    //TODO: pack style
+//    //wasm_btn_set_style(btn, type, style);
+//}
+//
+wgl_btn_state_t wgl_btn_get_state(const wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_GET_STATE);
+    return (wgl_btn_state_t)argv[0];
+}
+
+bool wgl_btn_get_toggle(const wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_GET_TOGGLE);
+    return (bool)argv[0];
+}
+
+uint16_t wgl_btn_get_ink_in_time(const wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_GET_INK_IN_TIME);
+    return (uint16_t)argv[0];
+}
+
+uint16_t wgl_btn_get_ink_wait_time(const wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_GET_INK_WAIT_TIME);
+    return (uint16_t)argv[0];
+}
+
+uint16_t wgl_btn_get_ink_out_time(const wgl_obj_t btn)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)btn;
+    CALL_BTN_NATIVE_FUNC(BTN_FUNC_ID_GET_INK_OUT_TIME);
+    return (uint16_t)argv[0];
+}
+//
+//const wgl_style_t * wgl_btn_get_style(const wgl_obj_t btn, wgl_btn_style_t type)
+//{
+//    //TODO: pack style
+//    //wasm_btn_get_style(btn, type);
+//    return NULL;
+//}

core/iwasm/lib/app-libs/extension/gui/src/wgl_cb.c

@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wgl.h"
+#include "native_interface.h"
+
+#include <string.h>
+
+#define ARGC sizeof(argv)/sizeof(uint32)
+#define CALL_CB_NATIVE_FUNC(id) wasm_cb_native_call(id, (uint32)argv, ARGC)
+
+wgl_obj_t wgl_cb_create(wgl_obj_t par, const wgl_obj_t copy)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)par;
+    argv[1] = (uint32)copy;
+    CALL_CB_NATIVE_FUNC(CB_FUNC_ID_CREATE);
+    return (wgl_obj_t)argv[0];
+}
+
+void wgl_cb_set_text(wgl_obj_t cb, const char * txt)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)cb;
+    argv[1] = (uint32)txt;
+    argv[2] = strlen(txt) + 1;
+    CALL_CB_NATIVE_FUNC(CB_FUNC_ID_SET_TEXT);
+}
+
+void wgl_cb_set_static_text(wgl_obj_t cb, const char * txt)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)cb;
+    argv[1] = (uint32)txt;
+    argv[2] = strlen(txt) + 1;
+    CALL_CB_NATIVE_FUNC(CB_FUNC_ID_SET_STATIC_TEXT);
+}
+
+//void wgl_cb_set_style(wgl_obj_t cb, wgl_cb_style_t type, const wgl_style_t * style)
+//{
+//    //TODO:
+//}
+//
+
+unsigned int wgl_cb_get_text_length(wgl_obj_t cb)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)cb;
+    CALL_CB_NATIVE_FUNC(CB_FUNC_ID_GET_TEXT_LENGTH);
+    return argv[0];
+}
+
+char *wgl_cb_get_text(wgl_obj_t cb, char *buffer, int buffer_len)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)cb;
+    argv[1] = (uint32)buffer;
+    argv[2] = buffer_len;
+    CALL_CB_NATIVE_FUNC(CB_FUNC_ID_GET_TEXT);
+    return (char *)argv[0];
+}
+
+//const wgl_style_t * wgl_cb_get_style(const wgl_obj_t cb, wgl_cb_style_t type)
+//{
+//    //TODO
+//    return NULL;
+//}
+//
+
+

core/iwasm/lib/app-libs/extension/gui/src/wgl_label.c

@@ -0,0 +1,262 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include "wgl.h"
+#include "native_interface.h"
+#include <string.h>
+
+
+#define ARGC sizeof(argv)/sizeof(uint32)
+#define CALL_LABEL_NATIVE_FUNC(id) wasm_label_native_call(id, (uint32)argv, ARGC)
+
+wgl_obj_t wgl_label_create(wgl_obj_t par, wgl_obj_t copy)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)par;
+    argv[1] = (uint32)copy;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_CREATE);
+    return (wgl_obj_t)argv[0];
+}
+
+void wgl_label_set_text(wgl_obj_t label, const char * text)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = (uint32)text;
+    argv[2] = strlen(text) + 1;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_TEXT);
+}
+
+
+void wgl_label_set_array_text(wgl_obj_t label, const char * array, uint16_t size)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = (uint32)array;
+    argv[2] = size;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_ARRAY_TEXT);
+}
+
+
+void wgl_label_set_static_text(wgl_obj_t label, const char * text)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = (uint32)text;
+    argv[2] = strlen(text) + 1;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_STATIC_TEXT);
+}
+
+
+void wgl_label_set_long_mode(wgl_obj_t label, wgl_label_long_mode_t long_mode)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = long_mode;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_LONG_MODE);
+}
+
+
+void wgl_label_set_align(wgl_obj_t label, wgl_label_align_t align)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = align;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_ALIGN);
+}
+
+
+void wgl_label_set_recolor(wgl_obj_t label, bool en)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = en;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_RECOLOR);
+}
+
+
+void wgl_label_set_body_draw(wgl_obj_t label, bool en)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = en;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_BODY_DRAW);
+}
+
+
+void wgl_label_set_anim_speed(wgl_obj_t label, uint16_t anim_speed)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = anim_speed;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_ANIM_SPEED);
+}
+
+
+void wgl_label_set_text_sel_start(wgl_obj_t label, uint16_t index)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = index;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_TEXT_SEL_START);
+}
+
+
+void wgl_label_set_text_sel_end(wgl_obj_t label, uint16_t index)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = index;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_SET_TEXT_SEL_END);
+}
+
+unsigned int wgl_label_get_text_length(wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_TEXT_LENGTH);
+    return argv[0];
+}
+
+char * wgl_label_get_text(wgl_obj_t label, char *buffer, int buffer_len)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = (uint32)buffer;
+    argv[2] = buffer_len;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_TEXT);
+    return (char *)argv[0];
+}
+
+
+wgl_label_long_mode_t wgl_label_get_long_mode(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_LONG_MODE);
+    return (wgl_label_long_mode_t)argv[0];
+}
+
+
+wgl_label_align_t wgl_label_get_align(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_ALIGN);
+    return (wgl_label_align_t)argv[0];
+}
+
+
+bool wgl_label_get_recolor(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_RECOLOR);
+    return (bool)argv[0];
+}
+
+
+bool wgl_label_get_body_draw(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_BODY_DRAW);
+    return (bool)argv[0];
+}
+
+
+uint16_t wgl_label_get_anim_speed(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_ANIM_SPEED);
+    return (uint16_t)argv[0];
+}
+
+
+void wgl_label_get_letter_pos(const wgl_obj_t label, uint16_t index, wgl_point_t * pos)
+{
+    uint32 argv[4] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = index;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_LETTER_POS);
+    pos->x = argv[2];
+    pos->y = argv[3];
+}
+
+
+uint16_t wgl_label_get_letter_on(const wgl_obj_t label, wgl_point_t * pos)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = pos->x;
+    argv[2] = pos->y;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_LETTER_POS);
+    return (uint16_t)argv[0];
+}
+
+
+bool wgl_label_is_char_under_pos(const wgl_obj_t label, wgl_point_t * pos)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = pos->x;
+    argv[2] = pos->y;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_LETTER_POS);
+    return (bool)argv[0];
+}
+
+
+uint16_t wgl_label_get_text_sel_start(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_TEXT_SEL_START);
+    return (uint16_t)argv[0];
+}
+
+
+uint16_t wgl_label_get_text_sel_end(const wgl_obj_t label)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)label;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_GET_TEXT_SEL_END);
+    return (uint16_t)argv[0];
+}
+
+
+void wgl_label_ins_text(wgl_obj_t label, uint32_t pos, const char * txt)
+{
+    uint32 argv[4] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = pos;
+    argv[2] = (uint32)txt;
+    argv[3] = strlen(txt) + 1;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_INS_TEXT);
+}
+
+
+void wgl_label_cut_text(wgl_obj_t label, uint32_t pos, uint32_t cnt)
+{
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)label;
+    argv[1] = pos;
+    argv[2] = cnt;
+    CALL_LABEL_NATIVE_FUNC(LABEL_FUNC_ID_CUT_TEXT);
+}
+
+

core/iwasm/lib/app-libs/extension/gui/src/wgl_list.c

@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wgl.h"
+#include "native_interface.h"
+
+#include <string.h>
+
+#define ARGC sizeof(argv)/sizeof(uint32)
+#define CALL_LIST_NATIVE_FUNC(id) wasm_list_native_call(id, (int32)argv, ARGC)
+
+
+wgl_obj_t wgl_list_create(wgl_obj_t par, const wgl_obj_t copy)
+{
+    uint32 argv[2] = {0};
+    argv[0] = (uint32)par;
+    argv[1] = (uint32)copy;
+    CALL_LIST_NATIVE_FUNC(LIST_FUNC_ID_CREATE);
+    return (wgl_obj_t)argv[0];
+}
+//
+//
+//void wgl_list_clean(wgl_obj_t obj)
+//{
+//    wasm_list_clean(obj);
+//}
+//
+
+wgl_obj_t wgl_list_add_btn(wgl_obj_t list, const void * img_src, const char * txt)
+{
+    (void)img_src; /* doesn't support img src currently */
+
+    uint32 argv[3] = {0};
+    argv[0] = (uint32)list;
+    argv[1] = (uint32)txt;
+    argv[2] = strlen(txt) + 1;
+    CALL_LIST_NATIVE_FUNC(LIST_FUNC_ID_ADD_BTN);
+    return (wgl_obj_t)argv[0];
+}
+//
+//
+//bool wgl_list_remove(const wgl_obj_t list, uint16_t index)
+//{
+//    return wasm_list_remove(list, index);
+//}
+//
+//
+//void wgl_list_set_single_mode(wgl_obj_t list, bool mode)
+//{
+//    wasm_list_set_single_mode(list, mode);
+//}
+//
+//#if LV_USE_GROUP
+//
+//
+//void wgl_list_set_btn_selected(wgl_obj_t list, wgl_obj_t btn)
+//{
+//    wasm_list_set_btn_selected(list, btn);
+//}
+//#endif
+//
+//
+//void wgl_list_set_style(wgl_obj_t list, wgl_list_style_t type, const wgl_style_t * style)
+//{
+//    //TODO
+//}
+//
+//
+//bool wgl_list_get_single_mode(wgl_obj_t list)
+//{
+//    return wasm_list_get_single_mode(list);
+//}
+//
+//
+//const char * wgl_list_get_btn_text(const wgl_obj_t btn)
+//{
+//    return wasm_list_get_btn_text(btn);
+//}
+//
+//wgl_obj_t wgl_list_get_btn_label(const wgl_obj_t btn)
+//{
+//    return wasm_list_get_btn_label(btn);
+//}
+//
+//
+//wgl_obj_t wgl_list_get_btn_img(const wgl_obj_t btn)
+//{
+//    return wasm_list_get_btn_img(btn);
+//}
+//
+//
+//wgl_obj_t wgl_list_get_prev_btn(const wgl_obj_t list, wgl_obj_t prev_btn)
+//{
+//    return wasm_list_get_prev_btn(list, prev_btn);
+//}
+//
+//
+//wgl_obj_t wgl_list_get_next_btn(const wgl_obj_t list, wgl_obj_t prev_btn)
+//{
+//    return wasm_list_get_next_btn(list, prev_btn);
+//}
+//
+//
+//int32_t wgl_list_get_btn_index(const wgl_obj_t list, const wgl_obj_t btn)
+//{
+//    return wasm_list_get_btn_index(list, btn);
+//}
+//
+//
+//uint16_t wgl_list_get_size(const wgl_obj_t list)
+//{
+//    return wasm_list_get_size(list);
+//}
+//
+//#if LV_USE_GROUP
+//
+//wgl_obj_t wgl_list_get_btn_selected(const wgl_obj_t list)
+//{
+//    return wasm_list_get_btn_selected(list);
+//}
+//#endif
+//
+//
+//
+//const wgl_style_t * wgl_list_get_style(const wgl_obj_t list, wgl_list_style_t type)
+//{
+//    //TODO
+//    return NULL;
+//}
+//
+//
+//void wgl_list_up(const wgl_obj_t list)
+//{
+//    wasm_list_up(list);
+//}
+//
+//void wgl_list_down(const wgl_obj_t list)
+//{
+//    wasm_list_down(list);
+//}
+//
+//
+//void wgl_list_focus(const wgl_obj_t btn, wgl_anim_enable_t anim)
+//{
+//    wasm_list_focus(btn, anim);
+//}
+//
+
+

core/iwasm/lib/app-libs/extension/gui/src/wgl_obj.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "wgl.h"
+#include "native_interface.h"
+#include <stdlib.h>
+#include <string.h>
+
+#define ARGC sizeof(argv)/sizeof(uint32)
+#define CALL_OBJ_NATIVE_FUNC(id) wasm_obj_native_call(id, (int32)argv, ARGC)
+
+typedef struct _obj_evt_cb {
+    struct _obj_evt_cb *next;
+
+    wgl_obj_t obj;
+
+    wgl_event_cb_t event_cb;
+} obj_evt_cb_t;
+
+static obj_evt_cb_t *g_obj_evt_cb_list = NULL;
+
+/* For lvgl compatible */
+char g_widget_text[100];
+
+wgl_res_t wgl_obj_del(wgl_obj_t obj)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)obj;
+    CALL_OBJ_NATIVE_FUNC(OBJ_FUNC_ID_DEL);
+    return (wgl_res_t)argv[0];
+}
+
+void wgl_obj_del_async(wgl_obj_t obj)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)obj;
+    CALL_OBJ_NATIVE_FUNC(OBJ_FUNC_ID_DEL_ASYNC);
+}
+
+void wgl_obj_clean(wgl_obj_t obj)
+{
+    uint32 argv[1] = {0};
+    argv[0] = (uint32)obj;
+    CALL_OBJ_NATIVE_FUNC(OBJ_FUNC_ID_CLEAN);
+}
+
+void wgl_obj_align(wgl_obj_t obj, const wgl_obj_t base, wgl_align_t align, wgl_coord_t x_mod, wgl_coord_t y_mod)
+{
+    uint32 argv[5] = {0};
+    argv[0] = (uint32)obj;
+    argv[1] = (uint32)base;
+    argv[2] = align;
+    argv[3] = x_mod;
+    argv[4] = y_mod;
+    CALL_OBJ_NATIVE_FUNC(OBJ_FUNC_ID_ALIGN);
+}
+
+wgl_event_cb_t wgl_obj_get_event_cb(const wgl_obj_t obj)
+{
+    obj_evt_cb_t *obj_evt_cb = g_obj_evt_cb_list;
+    while (obj_evt_cb != NULL) {
+        if (obj_evt_cb->obj == obj) {
+            return obj_evt_cb->event_cb;
+        }
+        obj_evt_cb = obj_evt_cb->next;
+    }
+
+    return NULL;
+}
+
+void wgl_obj_set_event_cb(wgl_obj_t obj, wgl_event_cb_t event_cb)
+{
+    obj_evt_cb_t *obj_evt_cb;
+    uint32 argv[1] = {0};
+
+    obj_evt_cb = g_obj_evt_cb_list;
+    while (obj_evt_cb) {
+        if (obj_evt_cb->obj == obj) {
+            obj_evt_cb->event_cb = event_cb;
+            return;
+        }
+    }
+
+    obj_evt_cb = (obj_evt_cb_t *)malloc(sizeof(*obj_evt_cb));
+    if (obj_evt_cb == NULL)
+        return;
+
+    memset(obj_evt_cb, 0, sizeof(*obj_evt_cb));
+    obj_evt_cb->obj = obj;
+    obj_evt_cb->event_cb = event_cb;
+
+    if (g_obj_evt_cb_list != NULL) {
+        obj_evt_cb->next = g_obj_evt_cb_list;
+        g_obj_evt_cb_list = obj_evt_cb;
+    } else {
+        g_obj_evt_cb_list = obj_evt_cb;
+    }
+
+    argv[0] = (uint32)obj;
+    CALL_OBJ_NATIVE_FUNC(OBJ_FUNC_ID_SET_EVT_CB);
+}
+
+void on_widget_event(wgl_obj_t obj, wgl_event_t event)
+{
+    obj_evt_cb_t *obj_evt_cb = g_obj_evt_cb_list;
+
+    while (obj_evt_cb != NULL) {
+        if (obj_evt_cb->obj == obj) {
+            obj_evt_cb->event_cb(obj, event);
+            return;
+        }
+        obj_evt_cb = obj_evt_cb->next;
+    }
+}

core/iwasm/lib/app-libs/extension/gui/wgl.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_H
+#define WAMR_GRAPHIC_LIBRARY_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "wgl_shared_utils.h" /* shared types between app and native */
+
+#include "inc/wgl_types.h"
+#include "inc/wgl_obj.h"
+#include "inc/wgl_btn.h"
+#include "inc/wgl_cb.h"
+#include "inc/wgl_label.h"
+#include "inc/wgl_list.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_H */

core/iwasm/lib/native-interface/gui_api.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef GUI_API_H_
+#define GUI_API_H_
+#include "bh_platform.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void wasm_obj_native_call(int32 func_id, uint32 argv_offset, uint32 argc);
+void wasm_btn_native_call(int32 func_id, uint32 argv_offset, uint32 argc);
+void wasm_label_native_call(int32 func_id, uint32 argv_offset, uint32 argc);
+void wasm_cb_native_call(int32 func_id, uint32 argv_offset, uint32 argc);
+void wasm_list_native_call(int32 func_id, uint32 argv_offset, uint32 argc);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* GUI_API_H_ */

core/iwasm/lib/native-interface/native_interface.h

@@ -84,5 +84,7 @@ void wasm_close_connection(uint32 handle);
 int wasm_send_on_connection(uint32 handle, int32 data_offset, uint32 len);
 bool wasm_config_connection(uint32 handle, int32 cfg_offset, uint32 len);
 
+#include "gui_api.h"
+
 #endif /* DEPS_SSG_MICRO_RUNTIME_WASM_PO
 C_APP_LIBS_NATIVE_INTERFACE_NATIVE_INTERFACE_H_ */

core/iwasm/lib/native-interface/shared_utils.h

@@ -134,6 +134,8 @@ char * pack_response(response_t *response, int * size);
 response_t * unpack_response(char * packet, int size, response_t * response);
 void free_req_resp_packet(char * packet);
 
+#include "wgl_shared_utils.h"
+
 #ifdef __cplusplus
 }
 #endif

core/iwasm/lib/native-interface/wgl_shared_utils.h

@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef WAMR_GRAPHIC_LIBRARY_SHARED_UTILS_H
+#define WAMR_GRAPHIC_LIBRARY_SHARED_UTILS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+
+#include "../3rdparty/lv_conf.h"
+
+typedef lv_coord_t wgl_coord_t; /* lv_coord_t is defined in lv_conf.h */
+
+/**
+ * Represents a point on the screen.
+ */
+typedef struct
+{
+    lv_coord_t x;
+    lv_coord_t y;
+} wgl_point_t;
+
+/** Represents an area of the screen. */
+typedef struct
+{
+    lv_coord_t x1;
+    lv_coord_t y1;
+    lv_coord_t x2;
+    lv_coord_t y2;
+} wgl_area_t;
+
+
+/** Describes the properties of a glyph. */
+typedef struct
+{
+    uint16_t adv_w; /**< The glyph needs this space. Draw the next glyph after this width. 8 bit integer, 4 bit fractional */
+    uint8_t box_w;  /**< Width of the glyph's bounding box*/
+    uint8_t box_h;  /**< Height of the glyph's bounding box*/
+    int8_t ofs_x;   /**< x offset of the bounding box*/
+    int8_t ofs_y;  /**< y offset of the bounding box*/
+    uint8_t bpp;   /**< Bit-per-pixel: 1, 2, 4, 8*/
+}wgl_font_glyph_dsc_t;
+
+/*Describe the properties of a font*/
+typedef struct _wgl_font_struct
+{
+    /** Get a glyph's  descriptor from a font*/
+    bool (*get_glyph_dsc)(const struct _wgl_font_struct *, wgl_font_glyph_dsc_t *, uint32_t letter, uint32_t letter_next);
+
+    /** Get a glyph's bitmap from a font*/
+    const uint8_t * (*get_glyph_bitmap)(const struct _wgl_font_struct *, uint32_t);
+
+    /*Pointer to the font in a font pack (must have the same line height)*/
+    uint8_t line_height;      /**< The real line height where any text fits*/
+    uint8_t base_line;        /**< Base line measured from the top of the line_height*/
+    void * dsc;               /**< Store implementation specific data here*/
+#if LV_USE_USER_DATA
+    wgl_font_user_data_t user_data; /**< Custom user data for font. */
+#endif
+} wgl_font_t;
+
+#if LV_COLOR_DEPTH == 1
+#define LV_COLOR_SIZE 8
+#elif LV_COLOR_DEPTH == 8
+#define LV_COLOR_SIZE 8
+#elif LV_COLOR_DEPTH == 16
+#define LV_COLOR_SIZE 16
+#elif LV_COLOR_DEPTH == 32
+#define LV_COLOR_SIZE 32
+#else
+#error "Invalid LV_COLOR_DEPTH in lv_conf.h! Set it to 1, 8, 16 or 32!"
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+typedef union
+{
+    uint8_t blue : 1;
+    uint8_t green : 1;
+    uint8_t red : 1;
+    uint8_t full : 1;
+} wgl_color1_t;
+
+typedef union
+{
+    struct
+    {
+        uint8_t blue : 2;
+        uint8_t green : 3;
+        uint8_t red : 3;
+    } ch;
+    uint8_t full;
+} wgl_color8_t;
+
+typedef union
+{
+    struct
+    {
+#if LV_COLOR_16_SWAP == 0
+        uint16_t blue : 5;
+        uint16_t green : 6;
+        uint16_t red : 5;
+#else
+        uint16_t green_h : 3;
+        uint16_t red : 5;
+        uint16_t blue : 5;
+        uint16_t green_l : 3;
+#endif
+    } ch;
+    uint16_t full;
+} wgl_color16_t;
+
+typedef union
+{
+    struct
+    {
+        uint8_t blue;
+        uint8_t green;
+        uint8_t red;
+        uint8_t alpha;
+    } ch;
+    uint32_t full;
+} wgl_color32_t;
+
+#if LV_COLOR_DEPTH == 1
+typedef uint8_t wgl_color_int_t;
+typedef wgl_color1_t wgl_color_t;
+#elif LV_COLOR_DEPTH == 8
+typedef uint8_t wgl_color_int_t;
+typedef wgl_color8_t wgl_color_t;
+#elif LV_COLOR_DEPTH == 16
+typedef uint16_t wgl_color_int_t;
+typedef wgl_color16_t wgl_color_t;
+#elif LV_COLOR_DEPTH == 32
+typedef uint32_t wgl_color_int_t;
+typedef wgl_color32_t wgl_color_t;
+#else
+#error "Invalid LV_COLOR_DEPTH in lv_conf.h! Set it to 1, 8, 16 or 32!"
+#endif
+
+typedef uint8_t wgl_opa_t;
+
+
+
+/*Border types (Use 'OR'ed values)*/
+enum {
+    WGL_BORDER_NONE     = 0x00,
+    WGL_BORDER_BOTTOM   = 0x01,
+    WGL_BORDER_TOP      = 0x02,
+    WGL_BORDER_LEFT     = 0x04,
+    WGL_BORDER_RIGHT    = 0x08,
+    WGL_BORDER_FULL     = 0x0F,
+    WGL_BORDER_INTERNAL = 0x10, /**< FOR matrix-like objects (e.g. Button matrix)*/
+};
+typedef uint8_t wgl_border_part_t;
+
+/*Shadow types*/
+enum {
+    WGL_SHADOW_BOTTOM = 0, /**< Only draw bottom shadow */
+    WGL_SHADOW_FULL,       /**< Draw shadow on all sides */
+};
+typedef uint8_t wgl_shadow_type_t;
+
+/**
+ * Objects in LittlevGL can be assigned a style - which holds information about
+ * how the object should be drawn.
+ *
+ * This allows for easy customization without having to modify the object's design
+ * function.
+ */
+typedef struct
+{
+    uint8_t glass : 1; /**< 1: Do not inherit this style*/
+
+    /** Object background. */
+    struct
+    {
+        wgl_color_t main_color; /**< Object's main background color. */
+        wgl_color_t grad_color; /**< Second color. If not equal to `main_color` a gradient will be drawn for the background. */
+        wgl_coord_t radius; /**< Object's corner radius. You can use #WGL_RADIUS_CIRCLE if you want to draw a circle. */
+        wgl_opa_t opa; /**< Object's opacity (0-255). */
+
+        struct
+        {
+            wgl_color_t color; /**< Border color */
+            wgl_coord_t width; /**< Border width */
+            wgl_border_part_t part; /**< Which borders to draw */
+            wgl_opa_t opa; /**< Border opacity. */
+        } border;
+
+
+        struct
+        {
+            wgl_color_t color;
+            wgl_coord_t width;
+            wgl_shadow_type_t type; /**< Which parts of the shadow to draw */
+        } shadow;
+
+        struct
+        {
+            wgl_coord_t top;
+            wgl_coord_t bottom;
+            wgl_coord_t left;
+            wgl_coord_t right;
+            wgl_coord_t inner;
+        } padding;
+    } body;
+
+    /** Style for text drawn by this object. */
+    struct
+    {
+        wgl_color_t color; /**< Text color */
+        wgl_color_t sel_color; /**< Text selection background color. */
+        const wgl_font_t * font;
+        wgl_coord_t letter_space; /**< Space between letters */
+        wgl_coord_t line_space; /**< Space between lines (vertical) */
+        wgl_opa_t opa; /**< Text opacity */
+    } text;
+
+    /**< Style of images. */
+    struct
+    {
+        wgl_color_t color; /**< Color to recolor the image with */
+        wgl_opa_t intense; /**< Opacity of recoloring (0 means no recoloring) */
+        wgl_opa_t opa; /**< Opacity of whole image */
+    } image;
+
+    /**< Style of lines (not borders). */
+    struct
+    {
+        wgl_color_t color;
+        wgl_coord_t width;
+        wgl_opa_t opa;
+        uint8_t rounded : 1; /**< 1: rounded line endings*/
+    } line;
+} wgl_style_t;
+
+
+
+/* Object native function IDs */
+enum {
+    OBJ_FUNC_ID_DEL,
+    OBJ_FUNC_ID_DEL_ASYNC,
+    OBJ_FUNC_ID_CLEAN,
+    OBJ_FUNC_ID_SET_EVT_CB,
+    OBJ_FUNC_ID_ALIGN,
+
+    /* Number of functions */
+    _OBJ_FUNC_ID_NUM,
+};
+
+/* Button native function IDs */
+enum {
+    BTN_FUNC_ID_CREATE,
+    BTN_FUNC_ID_SET_TOGGLE,
+    BTN_FUNC_ID_SET_STATE,
+    BTN_FUNC_ID_TOGGLE,
+    BTN_FUNC_ID_SET_INK_IN_TIME,
+    BTN_FUNC_ID_SET_INK_WAIT_TIME,
+    BTN_FUNC_ID_SET_INK_OUT_TIME,
+    BTN_FUNC_ID_GET_STATE,
+    BTN_FUNC_ID_GET_TOGGLE,
+    BTN_FUNC_ID_GET_INK_IN_TIME,
+    BTN_FUNC_ID_GET_INK_WAIT_TIME,
+    BTN_FUNC_ID_GET_INK_OUT_TIME,
+    /* Number of functions */
+    _BTN_FUNC_ID_NUM,
+};
+
+/* Check box native function IDs */
+enum {
+    CB_FUNC_ID_CREATE,
+    CB_FUNC_ID_SET_TEXT,
+    CB_FUNC_ID_SET_STATIC_TEXT,
+    CB_FUNC_ID_GET_TEXT,
+    CB_FUNC_ID_GET_TEXT_LENGTH,
+
+    /* Number of functions */
+    _CB_FUNC_ID_NUM,
+};
+
+/* List native function IDs */
+enum {
+    LIST_FUNC_ID_CREATE,
+    LIST_FUNC_ID_ADD_BTN,
+
+    /* Number of functions */
+    _LIST_FUNC_ID_NUM,
+};
+
+/* Label native function IDs */
+enum {
+    LABEL_FUNC_ID_CREATE,
+    LABEL_FUNC_ID_SET_TEXT,
+    LABEL_FUNC_ID_SET_ARRAY_TEXT,
+    LABEL_FUNC_ID_SET_STATIC_TEXT,
+    LABEL_FUNC_ID_SET_LONG_MODE,
+    LABEL_FUNC_ID_SET_ALIGN,
+    LABEL_FUNC_ID_SET_RECOLOR,
+    LABEL_FUNC_ID_SET_BODY_DRAW,
+    LABEL_FUNC_ID_SET_ANIM_SPEED,
+    LABEL_FUNC_ID_SET_TEXT_SEL_START,
+    LABEL_FUNC_ID_SET_TEXT_SEL_END,
+    LABEL_FUNC_ID_GET_TEXT,
+    LABEL_FUNC_ID_GET_TEXT_LENGTH,
+    LABEL_FUNC_ID_GET_LONG_MODE,
+    LABEL_FUNC_ID_GET_ALIGN,
+    LABEL_FUNC_ID_GET_RECOLOR,
+    LABEL_FUNC_ID_GET_BODY_DRAW,
+    LABEL_FUNC_ID_GET_ANIM_SPEED,
+    LABEL_FUNC_ID_GET_LETTER_POS,
+    LABEL_FUNC_ID_GET_TEXT_SEL_START,
+    LABEL_FUNC_ID_GET_TEXT_SEL_END,
+    LABEL_FUNC_ID_INS_TEXT,
+    LABEL_FUNC_ID_CUT_TEXT,
+    /* Number of functions */
+    _LABEL_FUNC_ID_NUM,
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_SHARED_UTILS_H */

core/iwasm/lib/native/extension/gui/wamr_gui.inl

@@ -0,0 +1,39 @@
+/*
+* Copyright (C) 2019 Intel Corporation.  All rights reserved.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/* button */
+EXPORT_WASM_API(wasm_btn_native_call),
+
+/* obj */
+EXPORT_WASM_API(wasm_obj_native_call),
+
+/* label */
+EXPORT_WASM_API(wasm_label_native_call),
+
+/* cont */
+//EXPORT_WASM_API(wasm_cont_native_call),
+
+/* page */
+//EXPORT_WASM_API(wasm_page_native_call),
+
+/* list */
+EXPORT_WASM_API(wasm_list_native_call),
+
+/* drop down list */
+//EXPORT_WASM_API(wasm_ddlist_native_call),
+
+/* check box */
+EXPORT_WASM_API(wasm_cb_native_call),

core/iwasm/lib/native/extension/gui/wasm_lib_gui.cmake

@@ -0,0 +1,25 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set (WASM_LIB_GUI_DIR ${CMAKE_CURRENT_LIST_DIR})
+
+set (THIRD_PARTY_DIR ${WASM_LIB_GUI_DIR}/../../../3rdparty)
+
+include_directories(${WASM_LIB_GUI_DIR} ${THIRD_PARTY_DIR} ${THIRD_PARTY_DIR}/lvgl)
+
+file (GLOB_RECURSE lvgl_source ${THIRD_PARTY_DIR}/lvgl/*.c)
+file (GLOB_RECURSE wrapper_source ${WASM_LIB_GUI_DIR}/*.c)
+
+set (WASM_LIB_GUI_SOURCE ${wrapper_source} ${lvgl_source})
+

core/iwasm/lib/native/extension/gui/wgl_btn_wrapper.c

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "native_interface.h"
+#include "lvgl.h"
+#include "module_wasm_app.h"
+#include "wgl_native_utils.h"
+
+/* -------------------------------------------------------------------------
+ * Button widget native function wrappers
+ * -------------------------------------------------------------------------*/
+static int32 _btn_create(lv_obj_t *par, lv_obj_t *copy)
+{
+    return wgl_native_wigdet_create(WIDGET_TYPE_BTN, par, copy);
+}
+
+static WGLNativeFuncDef btn_native_func_defs[] = {
+    { BTN_FUNC_ID_CREATE, _btn_create, HAS_RET, 2, {0 | NULL_OK, 1 | NULL_OK, -1},  {-1} },
+    { BTN_FUNC_ID_SET_TOGGLE, lv_btn_set_toggle, NO_RET, 2, {0, -1}, {-1} },
+    { BTN_FUNC_ID_SET_STATE, lv_btn_set_state, NO_RET, 2, {0, -1}, {-1} },
+//    { BTN_FUNC_ID_SET_STYLE, _btn_set_style, NO_RET, 2, {0, -1}, {-1} },
+    { BTN_FUNC_ID_SET_INK_IN_TIME, lv_btn_set_ink_in_time, NO_RET, 2, {0, -1}, {-1} },
+    { BTN_FUNC_ID_SET_INK_OUT_TIME, lv_btn_set_ink_out_time, NO_RET, 2, {0, -1}, {-1} },
+    { BTN_FUNC_ID_SET_INK_WAIT_TIME, lv_btn_set_ink_wait_time, NO_RET, 2, {0, -1}, {-1} },
+    { BTN_FUNC_ID_GET_INK_IN_TIME, lv_btn_get_ink_in_time, HAS_RET, 1, {0, -1}, {-1} },
+    { BTN_FUNC_ID_GET_INK_OUT_TIME, lv_btn_get_ink_out_time, HAS_RET, 1, {0, -1}, {-1} },
+    { BTN_FUNC_ID_GET_INK_WAIT_TIME, lv_btn_get_ink_wait_time, HAS_RET, 1, {0, -1}, {-1} },
+    { BTN_FUNC_ID_GET_STATE, lv_btn_get_state, HAS_RET, 1, {0, -1}, {-1} },
+    { BTN_FUNC_ID_GET_TOGGLE, lv_btn_get_toggle, HAS_RET, 1, {0, -1}, {-1} },
+    { BTN_FUNC_ID_TOGGLE, lv_btn_toggle, NO_RET, 1, {0, -1}, {-1} },
+
+};
+
+/*************** Native Interface to Wasm App ***********/
+void wasm_btn_native_call(int32 func_id, uint32 argv_offset, uint32 argc)
+{
+    uint32 size = sizeof(btn_native_func_defs) / sizeof(WGLNativeFuncDef);
+
+    wgl_native_func_call(btn_native_func_defs,
+                         size,
+                         func_id,
+                         argv_offset,
+                         argc);
+}

core/iwasm/lib/native/extension/gui/wgl_cb_wrapper.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "lvgl.h"
+#include "wasm_export.h"
+#include "native_interface.h"
+#include "module_wasm_app.h"
+#include "wgl_native_utils.h"
+
+/* -------------------------------------------------------------------------
+ * Label widget native function wrappers
+ * -------------------------------------------------------------------------*/
+static int32 _cb_create(lv_obj_t *par, lv_obj_t *copy)
+{
+    return wgl_native_wigdet_create(WIDGET_TYPE_CB, par, copy);
+}
+
+static int32 _cb_get_text_length(lv_obj_t *cb)
+{
+    const char *text = lv_cb_get_text(cb);
+
+    if (text == NULL)
+        return 0;
+
+    return strlen(text);
+}
+
+static int32 _cb_get_text(lv_obj_t *cb, char *buffer, int buffer_len)
+{
+    wasm_module_inst_t module_inst = get_module_inst();
+    const char *text = lv_cb_get_text(cb);
+
+    if (text == NULL)
+        return 0;
+
+    strncpy(buffer, text, buffer_len - 1);
+    buffer[buffer_len - 1] = '\0';
+
+    return addr_native_to_app(buffer);
+}
+
+static WGLNativeFuncDef cb_native_func_defs[] = {
+        { CB_FUNC_ID_CREATE, _cb_create, HAS_RET, 2, {0 | NULL_OK, 1 | NULL_OK, -1}, {-1} },
+        { CB_FUNC_ID_SET_TEXT, lv_cb_set_text, NO_RET, 2, {0, -1}, {1, -1} },
+        { CB_FUNC_ID_SET_STATIC_TEXT, lv_cb_set_static_text, NO_RET, 2, {0, -1}, {1, -1} },
+        { CB_FUNC_ID_GET_TEXT_LENGTH, _cb_get_text_length, HAS_RET, 1, {0, -1}, {-1} },
+        { CB_FUNC_ID_GET_TEXT, _cb_get_text, HAS_RET, 3, {0, -1}, {1, -1} },
+};
+
+/*************** Native Interface to Wasm App ***********/
+void wasm_cb_native_call(int32 func_id, uint32 argv_offset, uint32 argc)
+{
+    uint32 size = sizeof(cb_native_func_defs) / sizeof(WGLNativeFuncDef);
+
+    wgl_native_func_call(cb_native_func_defs,
+                         size,
+                         func_id,
+                         argv_offset,
+                         argc);
+}

core/iwasm/lib/native/extension/gui/wgl_cont_wrapper.c

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "lvgl.h"
+#include "module_wasm_app.h"

core/iwasm/lib/native/extension/gui/wgl_label_wrapper.c

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "lvgl.h"
+#include "wasm_export.h"
+#include "native_interface.h"
+#include "module_wasm_app.h"
+#include "wgl_native_utils.h"
+
+/* -------------------------------------------------------------------------
+ * Label widget native function wrappers
+ * -------------------------------------------------------------------------*/
+static int32 _label_create(lv_obj_t *par, lv_obj_t *copy)
+{
+    return wgl_native_wigdet_create(WIDGET_TYPE_LABEL, par, copy);
+}
+
+static int32 _label_get_text_length(lv_obj_t *label)
+{
+    char *text = lv_label_get_text(label);
+
+    if (text == NULL)
+        return 0;
+
+    return strlen(text);
+}
+
+static int32 _label_get_text(lv_obj_t *label, char *buffer, int buffer_len)
+{
+    wasm_module_inst_t module_inst = get_module_inst();
+    char *text = lv_label_get_text(label);
+
+    if (text == NULL)
+        return 0;
+
+    strncpy(buffer, text, buffer_len - 1);
+    buffer[buffer_len - 1] = '\0';
+
+    return addr_native_to_app(buffer);
+}
+
+static WGLNativeFuncDef label_native_func_defs[] = {
+        { LABEL_FUNC_ID_CREATE, _label_create, HAS_RET, 2, {0 | NULL_OK, 1 | NULL_OK, -1}, {-1} },
+        { LABEL_FUNC_ID_SET_TEXT, lv_label_set_text, NO_RET, 2, {0, -1}, {1, -1} },
+        { LABEL_FUNC_ID_GET_TEXT_LENGTH, _label_get_text_length, HAS_RET, 1, {0, -1}, {-1} },
+        { LABEL_FUNC_ID_GET_TEXT, _label_get_text, HAS_RET, 3, {0, -1}, {1, -1} },
+};
+
+/*************** Native Interface to Wasm App ***********/
+void wasm_label_native_call(int32 func_id, uint32 argv_offset, uint32 argc)
+{
+    uint32 size = sizeof(label_native_func_defs) / sizeof(WGLNativeFuncDef);
+
+    wgl_native_func_call(label_native_func_defs,
+                         size,
+                         func_id,
+                         argv_offset,
+                         argc);
+}

core/iwasm/lib/native/extension/gui/wgl_list_wrapper.c

@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "native_interface.h"
+#include "lvgl.h"
+#include "module_wasm_app.h"
+#include "wgl_native_utils.h"
+
+/* -------------------------------------------------------------------------
+ * List widget native function wrappers
+ * -------------------------------------------------------------------------*/
+static int32 _list_create(lv_obj_t *par, lv_obj_t *copy)
+{
+    return wgl_native_wigdet_create(WIDGET_TYPE_LIST, par, copy);
+}
+
+static int32 _list_add_btn(lv_obj_t *list, const char *text)
+{
+    uint32 btn_obj_id;
+    lv_obj_t *btn;
+
+    btn = lv_list_add_btn(list, NULL, text);
+
+    if (btn == NULL)
+        return 0;
+
+    if (wgl_native_add_object(btn,
+                              app_manager_get_module_id(Module_WASM_App),
+                              &btn_obj_id))
+        return btn_obj_id; /* success return */
+
+    return 0;
+}
+
+static WGLNativeFuncDef list_native_func_defs[] = {
+    { LIST_FUNC_ID_CREATE, _list_create, HAS_RET, 2, {0 | NULL_OK, 1 | NULL_OK, -1},  {-1} },
+    { LIST_FUNC_ID_ADD_BTN, _list_add_btn, HAS_RET, 2, {0, -1}, {1, -1} },
+};
+
+/*************** Native Interface to Wasm App ***********/
+void wasm_list_native_call(int32 func_id, uint32 argv_offset, uint32 argc)
+{
+    uint32 size = sizeof(list_native_func_defs) / sizeof(WGLNativeFuncDef);
+
+    wgl_native_func_call(list_native_func_defs,
+                         size,
+                         func_id,
+                         argv_offset,
+                         argc);
+}

core/iwasm/lib/native/extension/gui/wgl_native_utils.c

@@ -0,0 +1,201 @@
+
+
+#include "wgl_native_utils.h"
+#include "lvgl.h"
+#include "module_wasm_app.h"
+#include "wasm_export.h"
+
+#include <stdint.h>
+
+#define THROW_EXC(msg) wasm_runtime_set_exception(get_module_inst(), msg);
+
+void
+wasm_runtime_set_exception(wasm_module_inst_t module, const char *exception);
+
+uint32 wgl_native_wigdet_create(int8 widget_type, lv_obj_t *par, lv_obj_t *copy)
+{
+    uint32 obj_id;
+    lv_obj_t *wigdet;
+
+    //TODO: limit total widget number
+
+    if (par == NULL)
+        par = lv_disp_get_scr_act(NULL);
+
+    if (widget_type == WIDGET_TYPE_BTN)
+        wigdet = lv_btn_create(par, copy);
+    else if (widget_type == WIDGET_TYPE_LABEL)
+        wigdet = lv_label_create(par, copy);
+    else if (widget_type == WIDGET_TYPE_CB)
+        wigdet = lv_cb_create(par, copy);
+    else if (widget_type == WIDGET_TYPE_LIST)
+        wigdet = lv_list_create(par, copy);
+    else if (widget_type == WIDGET_TYPE_DDLIST)
+        wigdet = lv_ddlist_create(par, copy);
+
+    if (wigdet == NULL)
+        return 0;
+
+    if (wgl_native_add_object(wigdet,
+                              app_manager_get_module_id(Module_WASM_App),
+                              &obj_id))
+        return obj_id; /* success return */
+
+    return 0;
+}
+
+static void invokeNative(intptr_t argv[], uint32 argc, void (*native_code)())
+{
+    switch(argc) {
+        case 0:
+            native_code();
+            break;
+        case 1:
+            native_code(argv[0]);
+            break;
+        case 2:
+            native_code(argv[0], argv[1]);
+            break;
+        case 3:
+            native_code(argv[0], argv[1], argv[2]);
+            break;
+        case 4:
+            native_code(argv[0], argv[1], argv[2], argv[3]);
+            break;
+        case 5:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4]);
+            break;
+        case 6:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
+            break;
+        case 7:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4], argv[5],
+                        argv[6]);
+            break;
+        case 8:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4], argv[5],
+                        argv[6], argv[7]);
+            break;
+        case 9:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4], argv[5],
+                        argv[6], argv[7], argv[8]);
+            break;
+        case 10:
+            native_code(argv[0], argv[1], argv[2], argv[3], argv[4], argv[5],
+                        argv[6], argv[7], argv[8], argv[9]);
+            break;
+
+        default:
+            /* FIXME: If this happen, add more cases. */
+            wasm_runtime_set_exception(get_module_inst(),
+                    "the argument number of native function exceeds maximum");
+            return;
+    }
+}
+
+typedef void (*GenericFunctionPointer)();
+typedef int32 (*Int32FuncPtr)(intptr_t *, uint32, GenericFunctionPointer);
+typedef void (*VoidFuncPtr)(intptr_t *, uint32, GenericFunctionPointer);
+
+static Int32FuncPtr invokeNative_Int32 = (Int32FuncPtr)invokeNative;
+static VoidFuncPtr invokeNative_Void = (VoidFuncPtr)invokeNative;
+
+void wgl_native_func_call(WGLNativeFuncDef *funcs,
+                          uint32 size,
+                          int32 func_id,
+                          uint32 argv_offset,
+                          uint32 argc)
+{
+    WGLNativeFuncDef *func_def = funcs;
+    WGLNativeFuncDef *func_def_end = func_def + size;
+    uint32 *argv;
+    wasm_module_inst_t module_inst = get_module_inst();
+
+    if (!validate_app_addr(argv_offset, argc * sizeof(uint32)))
+        return;
+
+    argv = addr_app_to_native(argv_offset);
+
+    while (func_def < func_def_end) {
+        if (func_def->func_id == func_id) {
+            int i, obj_arg_num = 0, ptr_arg_num = 0;
+            intptr_t argv_copy_buf[16];
+            intptr_t *argv_copy = argv_copy_buf;
+
+            if (func_def->arg_num > 16) {
+                argv_copy = (intptr_t *)bh_malloc(func_def->arg_num *
+                                                  sizeof(intptr_t));
+                if (argv_copy == NULL)
+                    return;
+            }
+
+            /* Init argv_copy */
+            for (i = 0; i < func_def->arg_num; i++)
+                argv_copy[i] = (intptr_t)argv[i];
+
+            /* Validate object arguments */
+            i = 0;
+            for (; i < OBJ_ARG_NUM_MAX && func_def->obj_arg_indexes[i] != 0xff;
+                   i++, obj_arg_num++) {
+                uint8 index = func_def->obj_arg_indexes[i];
+                bool null_ok = index & NULL_OK;
+
+                index = index & (~NULL_OK);
+
+                /* Some API's allow to pass NULL obj, such as xxx_create() */
+                if (argv[index] == 0) {
+                    if (!null_ok) {
+                        THROW_EXC("the object id is 0 and invalid");
+                        goto fail;
+                    }
+                    /* Continue so that to pass null object validation */
+                    continue;
+                }
+
+                if (!wgl_native_validate_object(argv[index], (lv_obj_t **)&argv_copy[index])) {
+                    THROW_EXC("the object is invalid");
+                    goto fail;
+                }
+            }
+
+            /* Validate address arguments */
+            i = 0;
+            for (; i < PTR_ARG_NUM_MAX && func_def->ptr_arg_indexes[i] != 0xff;
+                   i++, ptr_arg_num++) {
+                uint8 index = func_def->ptr_arg_indexes[i];
+
+                /* The index+1 arg is the data size to be validated */
+                if (!validate_app_addr(argv[index], argv[index + 1]))
+                    goto fail;
+
+                /* Convert to native address before call lvgl function */
+                argv_copy[index] = (intptr_t)addr_app_to_native(argv[index]);
+            }
+
+            if (func_def->has_ret == NO_RET)
+                invokeNative_Void(argv_copy,
+                                  func_def->arg_num,
+                                  func_def->func_ptr);
+            else
+                argv[0] = invokeNative_Int32(argv_copy,
+                                             func_def->arg_num,
+                                             func_def->func_ptr);
+
+            if (argv_copy != argv_copy_buf)
+                bh_free(argv_copy);
+
+            /* success return */
+            return;
+
+        fail:
+            if (argv_copy != argv_copy_buf)
+                bh_free(argv_copy);
+            return;
+        }
+
+        func_def++;
+    }
+
+    THROW_EXC("the native widget function is not found!");
+}
+

core/iwasm/lib/native/extension/gui/wgl_native_utils.h

@@ -0,0 +1,73 @@
+
+
+#ifndef WAMR_GRAPHIC_LIBRARY_NATIVE_UTILS_H
+#define WAMR_GRAPHIC_LIBRARY_NATIVE_UTILS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "bh_platform.h"
+#include "lvgl.h"
+
+#define OBJ_ARG_NUM_MAX 4
+#define PTR_ARG_NUM_MAX 4
+
+#define NULL_OK  0x80
+
+enum {
+    HAS_RET,
+    NO_RET
+};
+
+enum {
+  WIDGET_TYPE_BTN,
+  WIDGET_TYPE_LABEL,
+  WIDGET_TYPE_CB,
+  WIDGET_TYPE_LIST,
+  WIDGET_TYPE_DDLIST,
+
+  _WIDGET_TYPE_NUM,
+};
+
+typedef struct WGLNativeFuncDef {
+    /* Function id */
+    int32 func_id;
+
+    /* Native function pointer */
+    void *func_ptr;
+
+    /* whether has return value */
+    uint8 has_ret;
+
+    /* argument number */
+    uint8 arg_num;
+
+    /* low 7 bit: obj argument index
+     * highest 1 bit: allow obj be null or not
+     * -1 means the end of this array */
+    uint8 obj_arg_indexes[OBJ_ARG_NUM_MAX];
+
+    /* pointer argument indexes, -1 means the end of this array */
+    uint8 ptr_arg_indexes[PTR_ARG_NUM_MAX];
+} WGLNativeFuncDef;
+
+bool wgl_native_validate_object(int32 obj_id, lv_obj_t **obj);
+
+bool wgl_native_add_object(lv_obj_t *obj, uint32 module_id, uint32 *obj_id);
+
+uint32 wgl_native_wigdet_create(int8 widget_type,
+                                lv_obj_t *par,
+                                lv_obj_t *copy);
+
+void wgl_native_func_call(WGLNativeFuncDef *funcs,
+                          uint32 size,
+                          int32 func_id,
+                          uint32 argv_offset,
+                          uint32 argc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WAMR_GRAPHIC_LIBRARY_NATIVE_UTILS_H */

core/iwasm/lib/native/extension/gui/wgl_obj_wrapper.c

@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "lvgl.h"
+#include "app_manager_export.h"
+#include "module_wasm_app.h"
+#include "bh_list.h"
+#include "bh_thread.h"
+#include "wgl_native_utils.h"
+
+
+typedef struct {
+    bh_list_link l;
+
+    /* The object id. */
+    uint32 obj_id;
+
+    /* The lv object */
+    lv_obj_t *obj;
+
+    /* Module id that the obj belongs to */
+    uint32 module_id;
+} object_node_t;
+
+typedef struct {
+    int32 obj_id;
+    lv_event_t event;
+} object_event_t;
+
+/* Max obj id */
+static uint32 g_obj_id_max = 0;
+
+static bh_list g_object_list;
+
+static korp_mutex g_object_list_mutex;
+
+static void app_mgr_object_event_callback(module_data *m_data, bh_message_t msg)
+{
+    uint32 argv[2];
+    wasm_function_inst_t func_on_object_event;
+    bh_assert(WIDGET_EVENT_WASM == bh_message_type(msg));
+    wasm_data *wasm_app_data = (wasm_data*) m_data->internal_data;
+    wasm_module_inst_t inst = wasm_app_data->wasm_module_inst;
+    object_event_t *object_event
+                       = (object_event_t *)bh_message_payload(msg);
+
+    if (object_event == NULL)
+        return;
+
+    func_on_object_event = wasm_runtime_lookup_function(inst, "_on_widget_event",
+                                                      "(i32i32)");
+    if (!func_on_object_event) {
+        printf("Cannot find function _on_object_event\n");
+        return;
+    }
+
+    argv[0] = object_event->obj_id;
+    argv[1] = object_event->event;
+    if (!wasm_runtime_call_wasm(inst, NULL, func_on_object_event, 2, argv)) {
+        printf(":Got exception running wasm code: %s\n",
+                wasm_runtime_get_exception(inst));
+        wasm_runtime_clear_exception(inst);
+        return;
+    }
+}
+
+static void cleanup_object_list(uint32 module_id)
+{
+    object_node_t *elem;
+
+    vm_mutex_lock(&g_object_list_mutex);
+
+    while (true) {
+        bool found = false;
+        elem = (object_node_t *)bh_list_first_elem(&g_object_list);
+        while (elem) {
+            /* delete the leaf node belongs to the module firstly */
+            if (module_id == elem->module_id &&
+                lv_obj_count_children(elem->obj) == 0) {
+                object_node_t *next = (object_node_t *)bh_list_elem_next(elem);
+
+                found = true;
+                lv_obj_del(elem->obj);
+                bh_list_remove(&g_object_list, elem);
+                bh_free(elem);
+                elem = next;
+            } else {
+                elem = (object_node_t *)bh_list_elem_next(elem);
+            }
+        }
+
+        if (!found)
+            break;
+    }
+
+    vm_mutex_unlock(&g_object_list_mutex);
+}
+
+static bool init_object_event_callback_framework()
+{
+    if (!wasm_register_cleanup_callback(cleanup_object_list)) {
+        goto fail;
+    }
+
+    if (!wasm_register_msg_callback(WIDGET_EVENT_WASM,
+                                    app_mgr_object_event_callback)) {
+        goto fail;
+    }
+
+    return true;
+
+fail:
+    return false;
+}
+
+bool wgl_native_validate_object(int32 obj_id, lv_obj_t **obj)
+{
+    object_node_t *elem;
+
+    vm_mutex_lock(&g_object_list_mutex);
+
+    elem = (object_node_t *)bh_list_first_elem(&g_object_list);
+    while (elem) {
+        if (obj_id == elem->obj_id) {
+            if (obj != NULL)
+                *obj = elem->obj;
+            vm_mutex_unlock(&g_object_list_mutex);
+            return true;
+        }
+        elem = (object_node_t *) bh_list_elem_next(elem);
+    }
+
+    vm_mutex_unlock(&g_object_list_mutex);
+
+    return false;
+}
+
+bool wgl_native_add_object(lv_obj_t *obj, uint32 module_id, uint32 *obj_id)
+{
+    object_node_t *node;
+
+    node = (object_node_t *) bh_malloc(sizeof(object_node_t));
+
+    if (node == NULL)
+        return false;
+
+    /* Generate an obj id */
+    g_obj_id_max++;
+    if (g_obj_id_max == -1)
+        g_obj_id_max = 1;
+
+    memset(node, 0, sizeof(*node));
+    node->obj = obj;
+    node->obj_id = g_obj_id_max;
+    node->module_id = module_id;
+
+    vm_mutex_lock(&g_object_list_mutex);
+    bh_list_insert(&g_object_list, node);
+    vm_mutex_unlock(&g_object_list_mutex);
+
+    if (obj_id != NULL)
+        *obj_id = node->obj_id;
+
+    return true;
+}
+
+static void _obj_del_recursive(lv_obj_t *obj)
+{
+    object_node_t *elem;
+    lv_obj_t * i;
+    lv_obj_t * i_next;
+
+    i = lv_ll_get_head(&(obj->child_ll));
+
+    while (i != NULL) {
+        /*Get the next object before delete this*/
+        i_next = lv_ll_get_next(&(obj->child_ll), i);
+
+        /*Call the recursive del to the child too*/
+        _obj_del_recursive(i);
+
+        /*Set i to the next node*/
+        i = i_next;
+    }
+
+    vm_mutex_lock(&g_object_list_mutex);
+
+    elem = (object_node_t *)bh_list_first_elem(&g_object_list);
+    while (elem) {
+        if (obj == elem->obj) {
+            bh_list_remove(&g_object_list, elem);
+            bh_free(elem);
+            vm_mutex_unlock(&g_object_list_mutex);
+            return;
+        }
+        elem = (object_node_t *) bh_list_elem_next(elem);
+    }
+
+    vm_mutex_unlock(&g_object_list_mutex);
+}
+
+static void _obj_clean_recursive(lv_obj_t *obj)
+{
+    lv_obj_t * i;
+    lv_obj_t * i_next;
+
+    i = lv_ll_get_head(&(obj->child_ll));
+
+    while (i != NULL) {
+        /*Get the next object before delete this*/
+        i_next = lv_ll_get_next(&(obj->child_ll), i);
+
+        /*Call the recursive del to the child too*/
+        _obj_del_recursive(i);
+
+        /*Set i to the next node*/
+        i = i_next;
+    }
+}
+
+static void post_widget_msg_to_module(object_node_t *object_node, lv_event_t event)
+{
+    module_data *module = module_data_list_lookup_id(object_node->module_id);
+    object_event_t *object_event;
+
+    if (module == NULL)
+        return;
+
+    object_event = (object_event_t *)bh_malloc(sizeof(*object_event));
+    if (object_event == NULL)
+        return;
+
+    memset(object_event, 0, sizeof(*object_event));
+    object_event->obj_id = object_node->obj_id;
+    object_event->event = event;
+
+    bh_post_msg(module->queue,
+                WIDGET_EVENT_WASM,
+                object_event,
+                sizeof(*object_event));
+}
+
+static void internal_lv_obj_event_cb(lv_obj_t *obj, lv_event_t event)
+{
+    object_node_t *elem;
+
+    vm_mutex_lock(&g_object_list_mutex);
+
+    elem = (object_node_t *)bh_list_first_elem(&g_object_list);
+    while (elem) {
+        if (obj == elem->obj) {
+            post_widget_msg_to_module(elem, event);
+            vm_mutex_unlock(&g_object_list_mutex);
+            return;
+        }
+        elem = (object_node_t *) bh_list_elem_next(elem);
+    }
+
+    vm_mutex_unlock(&g_object_list_mutex);
+}
+
+static void* lv_task_handler_thread_routine (void *arg)
+{
+    korp_sem sem;
+
+    vm_sem_init(&sem, 0);
+
+    while (true) {
+        vm_sem_reltimedwait(&sem, 100);
+        lv_task_handler();
+    }
+
+    return NULL;
+}
+
+void wgl_init(void)
+{
+    korp_thread tid;
+
+    lv_init();
+
+    bh_list_init(&g_object_list);
+    vm_recursive_mutex_init(&g_object_list_mutex);
+    init_object_event_callback_framework();
+
+    /* new a thread, call lv_task_handler periodically */
+    vm_thread_create(&tid,
+                     lv_task_handler_thread_routine,
+                     NULL,
+                     BH_APPLET_PRESERVED_STACK_SIZE);
+}
+
+/* -------------------------------------------------------------------------
+ * Obj native function wrappers
+ * -------------------------------------------------------------------------*/
+static lv_res_t _obj_del(lv_obj_t *obj)
+{
+    /* Recursively delete object node in the list belong to this
+     * parent object including itself */
+    _obj_del_recursive(obj);
+
+    return lv_obj_del(obj);
+}
+
+static void _obj_clean(lv_obj_t *obj)
+{
+    /* Recursively delete child object node in the list belong to this
+     * parent object */
+    _obj_clean_recursive(obj);
+
+    /* Delete all of its children */
+    lv_obj_clean(obj);
+}
+
+static void _obj_set_event_cb(lv_obj_t *obj)
+{
+    lv_obj_set_event_cb(obj, internal_lv_obj_event_cb);
+}
+/* ------------------------------------------------------------------------- */
+
+
+static WGLNativeFuncDef obj_native_func_defs[] = {
+    { OBJ_FUNC_ID_DEL, _obj_del, HAS_RET, 1, {0, -1}, {-1} },
+    { OBJ_FUNC_ID_DEL_ASYNC, lv_obj_del_async, NO_RET, 1, {0, -1}, {-1} },
+    { OBJ_FUNC_ID_CLEAN, _obj_clean, NO_RET, 1, {0, -1}, {-1} },
+    { OBJ_FUNC_ID_ALIGN, lv_obj_align, NO_RET, 5, {0, 1 | NULL_OK, -1}, {-1} },
+    { OBJ_FUNC_ID_SET_EVT_CB, _obj_set_event_cb, NO_RET, 1, {0, -1}, {-1} },
+};
+
+/*************** Native Interface to Wasm App ***********/
+void wasm_obj_native_call(int32 func_id, uint32 argv_offset, uint32 argc)
+{
+    uint32 size = sizeof(obj_native_func_defs) / sizeof(WGLNativeFuncDef);
+
+    wgl_native_func_call(obj_native_func_defs,
+                         size,
+                         func_id,
+                         argv_offset,
+                         argc);
+}

core/iwasm/runtime/vmcore-wasm/wasm_runtime.c

@@ -1225,7 +1225,8 @@ wasm_runtime_addr_native_to_app(WASMModuleInstance *module_inst,
                                 void *native_ptr)
 {
     WASMMemoryInstance *memory = module_inst->default_memory;
-    if ((uint8*)native_ptr < memory->heap_data)
+    if (memory->base_addr <= (uint8*)native_ptr
+        && (uint8*)native_ptr < memory->end_addr)
         return (uint8*)native_ptr - memory->memory_data;
     else
         return memory->heap_base_offset

samples/gui/README.md

@@ -0,0 +1,101 @@
+Introduction
+==============
+This sample demonstrates that a graphic user interface application in WebAssembly programming with WAMR graphic library(WGL) extension. WGL is implemented based on LittlevGL, an open-source embedded 2d graphic library. LittlevGL source code is built into the WAMR runtime and exported to Webassembly application with WGL extension. These extension API's are listed in: `<wamr_root>/core/iwasm/lib/app-libs/extension/gui/wgl.h`. Currently only a small set of API's  are provided and that would be extended in future.
+
+The runtime component supports building target for Linux and Zephyr/STM Nucleo board. The beauty of this sample is the WebAssembly application can have identical display and behavior when running from both runtime environments. That implies we can do majority of application validation from desktop environment as long as two runtime distributions support the same set of application interface.
+
+The sample also provides the native Linux version of application without the runtime under folder "lvgl-native-ui-app". It can help to check differences between the implementations in native and WebAssembly.
+
+ 
+<img src="../../doc/pics/vgl_linux.PNG">
+
+The number on top will plus one each second, and the number on the bottom will plus one when clicked.
+
+Install required SDK and libraries
+==============
+- 32 bit SDL(simple directmedia layer)
+Use apt-get</br>
+    `sudo apt-get install libsdl2-dev:i386`</br>
+Or download source from www.libsdl.org</br>
+    `./configure C_FLAGS=-m32 CXX_FLAGS=-m32 LD_FLAGS=-m32`</br>
+    `make`</br>
+    `sudo make install`</br>
+- Install EMSDK
+<pre>
+    https://emscripten.org/docs/tools_reference/emsdk.html
+</pre>
+
+Build and Run
+==============
+
+Linux
+--------------------------------
+- Build</br>
+`./build.sh`</br>
+    All binaries are in "out", which contains "host_tool", "lvgl_native_ui_app", "ui_app.wasm", "ui_app_lvgl_compatible" and "wasm_runtime_wgl".
+- Run native Linux application</br>
+`./lvgl_native_ui_app`</br>
+
+- Run WASM VM Linux applicaton & install WASM APP</br>
+ First start wasm_runtime_wgl in server mode.</br>
+`./wasm_runtime_wgl -s`</br>
+ Then install wasm APP use host tool.</br>
+`./host_tool -i ui_app -f ui_app.wasm`</br>
+`./host_tool -i ui_app -f ui_app_compatible.wasm`</br>
+
+Zephyr
+--------------------------------
+WASM VM and native extension method can be built into Zephyr, Then we can install wasm app into STM32.</br>
+- Build WASM VM into Zephyr system</br>
+ a. clone zephyr source code</br>
+Refer to Zephyr getting started.</br>
+https://docs.zephyrproject.org/latest/getting_started/index.html</br>
+`west init zephyrproject`</br>
+`cd zephyrproject`</br>
+`west update`</br>
+ b. copy samples</br>
+    `cd zephyr/samples/`</br>
+    `cp -a <wamr_root>samples/gui/wasm-runtime-wgl wasm-runtime-wgl`</br>
+    `cd wasm-runtime-wgl/zephyr_build`</br>
+ c. create a link to wamr core</br>
+   ` ln -s <wamr_root>/core core`</br>
+ d. build source code</br>
+    `mkdir build && cd build`</br>
+    `source ../../../../zephyr-env.sh`</br>
+    `cmake -GNinja -DBOARD=nucleo_f746zg ..`</br>
+   ` ninja flash`</br>
+
+- Test on STM32 NUCLEO_F767ZI with ILI9341 Display with XPT2046 touch</br>
+Hardware Connections
+
+```
++-------------------+-+------------------+
+|NUCLEO-F767ZI       | ILI9341  Display  |
++-------------------+-+------------------+
+| CN7.10             |         CLK       |
++-------------------+-+------------------+
+| CN7.12             |         MISO      |
++-------------------+-+------------------+
+| CN7.14             |         MOSI      |
++-------------------+-+------------------+
+| CN11.1             | CS1 for ILI9341   |
++-------------------+-+------------------+
+| CN11.2             |         D/C       |
++-------------------+-+------------------+
+| CN11.3             |         RESET     |
++-------------------+-+------------------+
+| CN9.25             |    PEN interrupt  |
++-------------------+-+------------------+
+| CN9.27             |  CS2 for XPT2046  |
++-------------------+-+------------------+
+| CN10.14            |    PC UART RX     |
++-------------------+-+------------------+
+| CN11.16            |    PC UART RX     |
++-------------------+-+------------------+
+```
+
+
+- Install WASM application to Zephyr using host_tool</br>
+First, connect PC and STM32 with UART. Then install to use host_tool.</br>
+`./host_tool -D /dev/ttyUSBXXX -i ui_app -f ui_app.wasm`
+

samples/gui/build.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+PROJECT_DIR=$PWD
+WAMR_DIR=${PWD}/../..
+OUT_DIR=${PWD}/out
+BUILD_DIR=${PWD}/build
+
+if [ ! -d $BUILD_DIR ]; then
+    mkdir ${BUILD_DIR}
+fi
+
+rm -rf ${OUT_DIR}
+mkdir ${OUT_DIR}
+
+
+cd ${WAMR_DIR}/core/shared-lib/mem-alloc
+if [ ! -d "tlsf" ]; then
+    git clone https://github.com/mattconte/tlsf
+fi
+
+echo "##################### 1. build native-ui-app start#####################"
+cd $BUILD_DIR
+mkdir -p lvgl-native-ui-app
+cd lvgl-native-ui-app
+cmake ${PROJECT_DIR}/lvgl-native-ui-app
+make
+if [ $? != 0 ];then
+    echo "BUILD_FAIL native-ui-app $?\n"
+    exit 2
+fi
+echo $PWD
+cp  lvgl_native_ui_app ${OUT_DIR}
+echo "#####################build native-ui-app success"
+
+echo "#####################build host-tool"
+cd $BUILD_DIR
+mkdir -p host-tool
+cd host-tool
+cmake ${WAMR_DIR}/test-tools/host-tool
+make
+if [ $? != 0 ];then
+        echo "BUILD_FAIL host tool exit as $?\n"
+        exit 2
+fi
+cp host_tool ${OUT_DIR}
+echo "#####################build host-tool success"
+
+
+echo "##################### 2. build littlevgl wasm runtime start#####################"
+cd $BUILD_DIR
+mkdir -p wasm-runtime-wgl
+cd wasm-runtime-wgl
+cmake ${PROJECT_DIR}/wasm-runtime-wgl/linux-build
+make
+cp wasm_runtime_wgl ${OUT_DIR}/
+
+echo "##################### build littlevgl wasm runtime end#####################"
+
+
+echo "##################### 3. build wasm ui app start#####################"
+cd ${PROJECT_DIR}/wasm-apps/wgl
+make
+cp ui_app.wasm ${OUT_DIR}/
+cd ${PROJECT_DIR}/wasm-apps/lvgl-compatible
+make
+cp ui_app_lvgl_compatible.wasm ${OUT_DIR}/
+echo "#####################  build wasm ui app end#####################"

samples/gui/lvgl-native-ui-app/CMakeLists.txt

@@ -0,0 +1,56 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required (VERSION 2.8.2)
+message ("lvgl_native_ui_app...")
+project (lvgl_native_ui_app)
+
+#################################################################
+#SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -m32 -g)
+
+set(lv_name lvgl)
+set(lv_drivers_name lv_drivers)
+set(LVGL_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/${lv_name})
+set(LVGL_DRIVER_DIR ${CMAKE_CURRENT_SOURCE_DIR}/${lv_drivers_name})
+
+if ((NOT EXISTS ${LVGL_SOURCE_DIR}) OR (NOT EXISTS ${LVGL_DRIVER_DIR}))
+        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt.in ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl/CMakeLists.txt)
+
+        execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl )
+        if(result)
+                message(FATAL_ERROR "CMake step for lvgl failed: ${result}")
+        endif()
+        execute_process(COMMAND ${CMAKE_COMMAND} --build .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl )
+        if(result)
+                message(FATAL_ERROR "Build step for lvgl failed: ${result}")
+        endif()
+endif()
+
+#################################
+set(CMAKE_C_STANDARD 11)#C11
+set(CMAKE_CXX_STANDARD 17)#C17
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR})
+
+file(GLOB_RECURSE INCLUDES "${LVGL_DRIVER_DIR}/*.h" "${LVGL_SOURCE_DIR}/*.h"  "./*.h" )
+file(GLOB_RECURSE SOURCES  "${LVGL_DRIVER_DIR}/*.c" "${LVGL_SOURCE_DIR}/*.c" )
+
+add_executable(lvgl_native_ui_app main.c get_time.c ${SOURCES} ${INCLUDES})
+target_link_libraries(lvgl_native_ui_app PRIVATE SDL2 )
+

samples/gui/lvgl-native-ui-app/CMakeLists.txt.in

@@ -0,0 +1,40 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 2.8.2)
+
+project(lvgl_download NONE)
+
+include(ExternalProject)
+ExternalProject_Add(${lv_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lvgl.git
+    GIT_TAG        "v6.0"
+    BINARY_DIR     ""
+    SOURCE_DIR            "${CMAKE_CURRENT_SOURCE_DIR}/${lv_name}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )
+
+ExternalProject_Add(${lv_drivers_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lv_drivers.git
+    GIT_TAG        ""
+    BINARY_DIR     ""
+    SOURCE_DIR            "${CMAKE_CURRENT_SOURCE_DIR}/${lv_drivers_name}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )

samples/gui/lvgl-native-ui-app/LICENCE.txt

@@ -0,0 +1,8 @@
+MIT licence
+Copyright (c) 2016 Gábor Kiss-Vámosi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

samples/gui/lvgl-native-ui-app/get_time.c

@@ -0,0 +1,11 @@
+#include <sys/time.h>
+#include "system_header.h"
+
+int time_get_ms()
+{
+    static struct timeval tv;
+    gettimeofday(&tv, NULL);
+    long long time_in_mill = (tv.tv_sec) * 1000 + (tv.tv_usec) / 1000;
+
+    return (int) time_in_mill;
+}

samples/gui/lvgl-native-ui-app/lv_conf.h

@@ -0,0 +1,495 @@
+/**
+ * @file lv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS `lv_conf.h` NEXT TO the `lvgl` FOLDER
+ */
+
+#if 1 /*Set it to "1" to enable content*/
+
+#ifndef LV_CONF_H
+#define LV_CONF_H
+/* clang-format off */
+
+#include <stdint.h>
+
+/*====================
+   Graphical settings
+ *====================*/
+
+/* Maximal horizontal and vertical resolution to support by the library.*/
+#define LV_HOR_RES_MAX          (320)
+#define LV_VER_RES_MAX          (240)
+
+/* Color depth:
+ * - 1:  1 byte per pixel
+ * - 8:  RGB233
+ * - 16: RGB565
+ * - 32: ARGB8888
+ */
+#define LV_COLOR_DEPTH     32
+
+/* Swap the 2 bytes of RGB565 color.
+ * Useful if the display has a 8 bit interface (e.g. SPI)*/
+#define LV_COLOR_16_SWAP   0
+
+/* 1: Enable screen transparency.
+ * Useful for OSD or other overlapping GUIs.
+ * Requires `LV_COLOR_DEPTH = 32` colors and the screen's style should be modified: `style.body.opa = ...`*/
+#define LV_COLOR_SCREEN_TRANSP    0
+
+/*Images pixels with this color will not be drawn (with chroma keying)*/
+#define LV_COLOR_TRANSP    LV_COLOR_LIME         /*LV_COLOR_LIME: pure green*/
+
+/* Enable anti-aliasing (lines, and radiuses will be smoothed) */
+#define LV_ANTIALIAS        1
+
+/* Default display refresh period.
+ * Can be changed in the display driver (`lv_disp_drv_t`).*/
+#define LV_DISP_DEF_REFR_PERIOD      30      /*[ms]*/
+
+/* Dot Per Inch: used to initialize default sizes.
+ * E.g. a button with width = LV_DPI / 2 -> half inch wide
+ * (Not so important, you can adjust it to modify default sizes and spaces)*/
+#define LV_DPI              100     /*[px]*/
+
+/* Type of coordinates. Should be `int16_t` (or `int32_t` for extreme cases) */
+typedef int16_t lv_coord_t;
+
+/*=========================
+   Memory manager settings
+ *=========================*/
+
+/* LittelvGL's internal memory manager's settings.
+ * The graphical objects and other related data are stored here. */
+
+/* 1: use custom malloc/free, 0: use the built-in `lv_mem_alloc` and `lv_mem_free` */
+#define LV_MEM_CUSTOM      0
+#if LV_MEM_CUSTOM == 0
+/* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
+#  define LV_MEM_SIZE    (128U * 1024U)
+
+/* Complier prefix for a big array declaration */
+#  define LV_MEM_ATTR
+
+/* Set an address for the memory pool instead of allocating it as an array.
+ * Can be in external SRAM too. */
+#  define LV_MEM_ADR          0
+
+/* Automatically defrag. on free. Defrag. means joining the adjacent free cells. */
+#  define LV_MEM_AUTO_DEFRAG  1
+#else       /*LV_MEM_CUSTOM*/
+#  define LV_MEM_CUSTOM_INCLUDE <stdlib.h>   /*Header for the dynamic memory function*/
+#  define LV_MEM_CUSTOM_ALLOC   malloc       /*Wrapper to malloc*/
+#  define LV_MEM_CUSTOM_FREE    free         /*Wrapper to free*/
+#endif     /*LV_MEM_CUSTOM*/
+
+/* Garbage Collector settings
+ * Used if lvgl is binded to higher level language and the memory is managed by that language */
+#define LV_ENABLE_GC 0
+#if LV_ENABLE_GC != 0
+#  define LV_GC_INCLUDE "gc.h"                           /*Include Garbage Collector related things*/
+#  define LV_MEM_CUSTOM_REALLOC   your_realloc           /*Wrapper to realloc*/
+#  define LV_MEM_CUSTOM_GET_SIZE  your_mem_get_size      /*Wrapper to lv_mem_get_size*/
+#endif /* LV_ENABLE_GC */
+
+/*=======================
+   Input device settings
+ *=======================*/
+
+/* Input device default settings.
+ * Can be changed in the Input device driver (`lv_indev_drv_t`)*/
+
+/* Input device read period in milliseconds */
+#define LV_INDEV_DEF_READ_PERIOD          30
+
+/* Drag threshold in pixels */
+#define LV_INDEV_DEF_DRAG_LIMIT           10
+
+/* Drag throw slow-down in [%]. Greater value -> faster slow-down */
+#define LV_INDEV_DEF_DRAG_THROW           20
+
+/* Long press time in milliseconds.
+ * Time to send `LV_EVENT_LONG_PRESSSED`) */
+#define LV_INDEV_DEF_LONG_PRESS_TIME      400
+
+/* Repeated trigger period in long press [ms]
+ * Time between `LV_EVENT_LONG_PRESSED_REPEAT */
+#define LV_INDEV_DEF_LONG_PRESS_REP_TIME  100
+
+/*==================
+ * Feature usage
+ *==================*/
+
+/*1: Enable the Animations */
+#define LV_USE_ANIMATION        1
+#if LV_USE_ANIMATION
+
+/*Declare the type of the user data of animations (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_anim_user_data_t;
+
+#endif
+
+/* 1: Enable shadow drawing*/
+#define LV_USE_SHADOW           1
+
+/* 1: Enable object groups (for keyboard/encoder navigation) */
+#define LV_USE_GROUP            1
+#if LV_USE_GROUP
+typedef void * lv_group_user_data_t;
+#endif  /*LV_USE_GROUP*/
+
+/* 1: Enable GPU interface*/
+#define LV_USE_GPU              1
+
+/* 1: Enable file system (might be required for images */
+#define LV_USE_FILESYSTEM       1
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_fs_drv_user_data_t;
+#endif
+
+/*1: Add a `user_data` to drivers and objects*/
+#define LV_USE_USER_DATA        1
+
+/*========================
+ * Image decoder and cache
+ *========================*/
+
+/* 1: Enable indexed (palette) images */
+#define LV_IMG_CF_INDEXED       1
+
+/* 1: Enable alpha indexed images */
+#define LV_IMG_CF_ALPHA         1
+
+/* Default image cache size. Image caching keeps the images opened.
+ * If only the built-in image formats are used there is no real advantage of caching.
+ * (I.e. no new image decoder is added)
+ * With complex image decoders (e.g. PNG or JPG) caching can save the continuous open/decode of images.
+ * However the opened images might consume additional RAM.
+ * LV_IMG_CACHE_DEF_SIZE must be >= 1 */
+#define LV_IMG_CACHE_DEF_SIZE       1
+
+/*Declare the type of the user data of image decoder (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_img_decoder_user_data_t;
+
+/*=====================
+ *  Compiler settings
+ *====================*/
+/* Define a custom attribute to `lv_tick_inc` function */
+#define LV_ATTRIBUTE_TICK_INC
+
+/* Define a custom attribute to `lv_task_handler` function */
+#define LV_ATTRIBUTE_TASK_HANDLER
+
+/* With size optimization (-Os) the compiler might not align data to
+ * 4 or 8 byte boundary. This alignment will be explicitly applied where needed.
+ * E.g. __attribute__((aligned(4))) */
+#define LV_ATTRIBUTE_MEM_ALIGN
+
+/* Attribute to mark large constant arrays for example
+ * font's bitmaps */
+#define LV_ATTRIBUTE_LARGE_CONST
+
+/*===================
+ *  HAL settings
+ *==================*/
+
+/* 1: use a custom tick source.
+ * It removes the need to manually update the tick with `lv_tick_inc`) */
+#define LV_TICK_CUSTOM     1
+#if LV_TICK_CUSTOM == 1
+#define LV_TICK_CUSTOM_INCLUDE  "system_header.h"       /*Header for the sys time function*/
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (time_get_ms())     /*Expression evaluating to current systime in ms*/
+#endif   /*LV_TICK_CUSTOM*/
+
+typedef void * lv_disp_drv_user_data_t;             /*Type of user data in the display driver*/
+typedef void * lv_indev_drv_user_data_t;            /*Type of user data in the input device driver*/
+
+/*================
+ * Log settings
+ *===============*/
+
+/*1: Enable the log module*/
+#define LV_USE_LOG      1
+#if LV_USE_LOG
+/* How important log should be added:
+ * LV_LOG_LEVEL_TRACE       A lot of logs to give detailed information
+ * LV_LOG_LEVEL_INFO        Log important events
+ * LV_LOG_LEVEL_WARN        Log if something unwanted happened but didn't cause a problem
+ * LV_LOG_LEVEL_ERROR       Only critical issue, when the system may fail
+ * LV_LOG_LEVEL_NONE        Do not log anything
+ */
+#  define LV_LOG_LEVEL    LV_LOG_LEVEL_WARN
+
+/* 1: Print the log with 'printf';
+ * 0: user need to register a callback with `lv_log_register_print`*/
+#  define LV_LOG_PRINTF   1
+#endif  /*LV_USE_LOG*/
+
+/*================
+ *  THEME USAGE
+ *================*/
+#define LV_THEME_LIVE_UPDATE    1   /*1: Allow theme switching at run time. Uses 8..10 kB of RAM*/
+
+#define LV_USE_THEME_TEMPL      1   /*Just for test*/
+#define LV_USE_THEME_DEFAULT    1   /*Built mainly from the built-in styles. Consumes very few RAM*/
+#define LV_USE_THEME_ALIEN      1   /*Dark futuristic theme*/
+#define LV_USE_THEME_NIGHT      1   /*Dark elegant theme*/
+#define LV_USE_THEME_MONO       1   /*Mono color theme for monochrome displays*/
+#define LV_USE_THEME_MATERIAL   1   /*Flat theme with bold colors and light shadows*/
+#define LV_USE_THEME_ZEN        1   /*Peaceful, mainly light theme */
+#define LV_USE_THEME_NEMO       1   /*Water-like theme based on the movie "Finding Nemo"*/
+
+/*==================
+ *    FONT USAGE
+ *===================*/
+
+/* The built-in fonts contains the ASCII range and some Symbols with  4 bit-per-pixel.
+ * The symbols are available via `LV_SYMBOL_...` defines
+ * More info about fonts: https://docs.littlevgl.com/#Fonts
+ * To create a new font go to: https://littlevgl.com/ttf-font-to-c-array
+ */
+
+/* Robot fonts with bpp = 4
+ * https://fonts.google.com/specimen/Roboto  */
+#define LV_FONT_ROBOTO_12    1
+#define LV_FONT_ROBOTO_16    1
+#define LV_FONT_ROBOTO_22    1
+#define LV_FONT_ROBOTO_28    1
+
+/*Pixel perfect monospace font
+ * http://pelulamu.net/unscii/ */
+#define LV_FONT_UNSCII_8     1
+
+/* Optionally declare your custom fonts here.
+ * You can use these fonts as default font too
+ * and they will be available globally. E.g.
+ * #define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(my_font_1) \
+ *                                LV_FONT_DECLARE(my_font_2)
+ */
+#define LV_FONT_CUSTOM_DECLARE
+
+/*Always set a default font from the built-in fonts*/
+#define LV_FONT_DEFAULT        &lv_font_roboto_16
+
+/* Enable it if you have fonts with a lot of characters.
+ * The limit depends on the font size, font face and bpp
+ * but with > 10,000 characters if you see issues probably you need to enable it.*/
+#define LV_FONT_FMT_TXT_LARGE   1
+
+/*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_font_user_data_t;
+
+/*=================
+ *  Text settings
+ *=================*/
+
+/* Select a character encoding for strings.
+ * Your IDE or editor should have the same character encoding
+ * - LV_TXT_ENC_UTF8
+ * - LV_TXT_ENC_ASCII
+ * */
+#define LV_TXT_ENC LV_TXT_ENC_UTF8
+
+ /*Can break (wrap) texts on these chars*/
+#define LV_TXT_BREAK_CHARS                  " ,.;:-_"
+
+/*===================
+ *  LV_OBJ SETTINGS
+ *==================*/
+
+/*Declare the type of the user data of object (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_obj_user_data_t;
+
+/*1: enable `lv_obj_realaign()` based on `lv_obj_align()` parameters*/
+#define LV_USE_OBJ_REALIGN          1
+
+/* Enable to make the object clickable on a larger area.
+ * LV_EXT_CLICK_AREA_OFF or 0: Disable this feature
+ * LV_EXT_CLICK_AREA_TINY: The extra area can be adjusted horizontally and vertically (0..255 px)
+ * LV_EXT_CLICK_AREA_FULL: The extra area can be adjusted in all 4 directions (-32k..+32k px)
+ */
+#define LV_USE_EXT_CLICK_AREA  LV_EXT_CLICK_AREA_FULL
+
+/*==================
+ *  LV OBJ X USAGE
+ *================*/
+/*
+ * Documentation of the object types: https://docs.littlevgl.com/#Object-types
+ */
+
+/*Arc (dependencies: -)*/
+#define LV_USE_ARC      1
+
+/*Bar (dependencies: -)*/
+#define LV_USE_BAR      1
+
+/*Button (dependencies: lv_cont*/
+#define LV_USE_BTN      1
+#if LV_USE_BTN != 0
+/*Enable button-state animations - draw a circle on click (dependencies: LV_USE_ANIMATION)*/
+#  define LV_BTN_INK_EFFECT   1
+#endif
+
+/*Button matrix (dependencies: -)*/
+#define LV_USE_BTNM     1
+
+/*Calendar (dependencies: -)*/
+#define LV_USE_CALENDAR 1
+
+/*Canvas (dependencies: lv_img)*/
+#define LV_USE_CANVAS   1
+
+/*Check box (dependencies: lv_btn, lv_label)*/
+#define LV_USE_CB       1
+
+/*Chart (dependencies: -)*/
+#define LV_USE_CHART    1
+#if LV_USE_CHART
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    20
+#endif
+
+/*Container (dependencies: -*/
+#define LV_USE_CONT     1
+
+/*Drop down list (dependencies: lv_page, lv_label, lv_symbol_def.h)*/
+#define LV_USE_DDLIST    1
+#if LV_USE_DDLIST != 0
+/*Open and close default animation time [ms] (0: no animation)*/
+#  define LV_DDLIST_DEF_ANIM_TIME     200
+#endif
+
+/*Gauge (dependencies:lv_bar, lv_lmeter)*/
+#define LV_USE_GAUGE    1
+
+/*Image (dependencies: lv_label*/
+#define LV_USE_IMG      1
+
+/*Image Button (dependencies: lv_btn*/
+#define LV_USE_IMGBTN   1
+#if LV_USE_IMGBTN
+/*1: The imgbtn requires left, mid and right parts and the width can be set freely*/
+#  define LV_IMGBTN_TILED 0
+#endif
+
+/*Keyboard (dependencies: lv_btnm)*/
+#define LV_USE_KB       1
+
+/*Label (dependencies: -*/
+#define LV_USE_LABEL    1
+#if LV_USE_LABEL != 0
+/*Hor, or ver. scroll speed [px/sec] in 'LV_LABEL_LONG_ROLL/ROLL_CIRC' mode*/
+#  define LV_LABEL_DEF_SCROLL_SPEED       25
+
+/* Waiting period at beginning/end of animation cycle */
+#  define LV_LABEL_WAIT_CHAR_COUNT        3
+
+/*Enable selecting text of the label */
+#  define LV_LABEL_TEXT_SEL               1
+
+/*Store extra some info in labels (12 bytes) to speed up drawing of very long texts*/
+#  define LV_LABEL_LONG_TXT_HINT          0
+#endif
+
+/*LED (dependencies: -)*/
+#define LV_USE_LED      1
+
+/*Line (dependencies: -*/
+#define LV_USE_LINE     1
+
+/*List (dependencies: lv_page, lv_btn, lv_label, (lv_img optionally for icons ))*/
+#define LV_USE_LIST     1
+#if LV_USE_LIST != 0
+/*Default animation time of focusing to a list element [ms] (0: no animation)  */
+#  define LV_LIST_DEF_ANIM_TIME  100
+#endif
+
+/*Line meter (dependencies: *;)*/
+#define LV_USE_LMETER   1
+
+/*Message box (dependencies: lv_rect, lv_btnm, lv_label)*/
+#define LV_USE_MBOX     1
+
+/*Page (dependencies: lv_cont)*/
+#define LV_USE_PAGE     1
+#if LV_USE_PAGE != 0
+/*Focus default animation time [ms] (0: no animation)*/
+#  define LV_PAGE_DEF_ANIM_TIME     400
+#endif
+
+/*Preload (dependencies: lv_arc, lv_anim)*/
+#define LV_USE_PRELOAD      1
+#if LV_USE_PRELOAD != 0
+#  define LV_PRELOAD_DEF_ARC_LENGTH   60      /*[deg]*/
+#  define LV_PRELOAD_DEF_SPIN_TIME    1000    /*[ms]*/
+#  define LV_PRELOAD_DEF_ANIM         LV_PRELOAD_TYPE_SPINNING_ARC
+#endif
+
+/*Roller (dependencies: lv_ddlist)*/
+#define LV_USE_ROLLER    1
+#if LV_USE_ROLLER != 0
+/*Focus animation time [ms] (0: no animation)*/
+#  define LV_ROLLER_DEF_ANIM_TIME     200
+
+/*Number of extra "pages" when the roller is infinite*/
+#  define LV_ROLLER_INF_PAGES         7
+#endif
+
+/*Slider (dependencies: lv_bar)*/
+#define LV_USE_SLIDER    1
+
+/*Spinbox (dependencies: lv_ta)*/
+#define LV_USE_SPINBOX       1
+
+/*Switch (dependencies: lv_slider)*/
+#define LV_USE_SW       1
+
+/*Text area (dependencies: lv_label, lv_page)*/
+#define LV_USE_TA       1
+#if LV_USE_TA != 0
+#  define LV_TA_DEF_CURSOR_BLINK_TIME 400     /*ms*/
+#  define LV_TA_DEF_PWD_SHOW_TIME     1500    /*ms*/
+#endif
+
+/*Table (dependencies: lv_label)*/
+#define LV_USE_TABLE    1
+#if LV_USE_TABLE
+#  define LV_TABLE_COL_MAX    12
+#endif
+
+/*Tab (dependencies: lv_page, lv_btnm)*/
+#define LV_USE_TABVIEW      1
+#  if LV_USE_TABVIEW != 0
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TABVIEW_DEF_ANIM_TIME    300
+#endif
+
+/*Tileview (dependencies: lv_page) */
+#define LV_USE_TILEVIEW     1
+#if LV_USE_TILEVIEW
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TILEVIEW_DEF_ANIM_TIME   300
+#endif
+
+/*Window (dependencies: lv_cont, lv_btn, lv_label, lv_img, lv_page)*/
+#define LV_USE_WIN      1
+
+/*==================
+ * Non-user section
+ *==================*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)    /* Disable warnings for Visual Studio*/
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
+/*--END OF LV_CONF_H--*/
+
+/*Be sure every define has a default value*/
+#include "lvgl/src/lv_conf_checker.h"
+
+#endif /*LV_CONF_H*/
+
+#endif /*End of "Content enable"*/

samples/gui/lvgl-native-ui-app/lv_drv_conf.h

@@ -0,0 +1,310 @@
+/**
+ * @file lv_drv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS lv_drv_conf.h
+ */
+
+#if 1 /*Set it to "1" to enable the content*/
+
+#ifndef LV_DRV_CONF_H
+#define LV_DRV_CONF_H
+
+#include "lv_conf.h"
+
+/*********************
+ * DELAY INTERFACE
+ *********************/
+#define LV_DRV_DELAY_INCLUDE  <stdint.h>            /*Dummy include by default*/
+#define LV_DRV_DELAY_US(us)  /*delay_us(us)*/       /*Delay the given number of microseconds*/
+#define LV_DRV_DELAY_MS(ms)  /*delay_ms(ms)*/       /*Delay the given number of milliseconds*/
+
+/*********************
+ * DISPLAY INTERFACE
+ *********************/
+
+/*------------
+ *  Common
+ *------------*/
+#define LV_DRV_DISP_INCLUDE         <stdint.h>           /*Dummy include by default*/
+#define LV_DRV_DISP_CMD_DATA(val)  /*pin_x_set(val)*/    /*Set the command/data pin to 'val'*/
+#define LV_DRV_DISP_RST(val)       /*pin_x_set(val)*/    /*Set the reset pin to 'val'*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_DISP_SPI_CS(val)          /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_DISP_SPI_WR_BYTE(data)    /*spi_wr(data)*/        /*Write a byte the SPI bus*/
+#define LV_DRV_DISP_SPI_WR_ARRAY(adr, n) /*spi_wr_mem(adr, n)*/  /*Write 'n' bytes to SPI bus from 'adr'*/
+
+/*------------------
+ *  Parallel port
+ *-----------------*/
+#define LV_DRV_DISP_PAR_CS(val)          /*par_cs_set(val)*/   /*Set the Parallel port's Chip select to 'val'*/
+#define LV_DRV_DISP_PAR_SLOW             /*par_slow()*/        /*Set low speed on the parallel port*/
+#define LV_DRV_DISP_PAR_FAST             /*par_fast()*/        /*Set high speed on the parallel port*/
+#define LV_DRV_DISP_PAR_WR_WORD(data)    /*par_wr(data)*/      /*Write a word to the parallel port*/
+#define LV_DRV_DISP_PAR_WR_ARRAY(adr, n) /*par_wr_mem(adr,n)*/ /*Write 'n' bytes to Parallel ports from 'adr'*/
+
+/***************************
+ * INPUT DEVICE INTERFACE
+ ***************************/
+
+/*----------
+ *  Common
+ *----------*/
+#define LV_DRV_INDEV_INCLUDE     <stdint.h>             /*Dummy include by default*/
+#define LV_DRV_INDEV_RST(val)    /*pin_x_set(val)*/     /*Set the reset pin to 'val'*/
+#define LV_DRV_INDEV_IRQ_READ    0 /*pn_x_read()*/      /*Read the IRQ pin*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_INDEV_SPI_CS(val)            /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_INDEV_SPI_XCHG_BYTE(data)    0 /*spi_xchg(val)*/     /*Write 'val' to SPI and give the read value*/
+
+/*---------
+ *  I2C
+ *---------*/
+#define LV_DRV_INDEV_I2C_START              /*i2c_start()*/       /*Make an I2C start*/
+#define LV_DRV_INDEV_I2C_STOP               /*i2c_stop()*/        /*Make an I2C stop*/
+#define LV_DRV_INDEV_I2C_RESTART            /*i2c_restart()*/     /*Make an I2C restart*/
+#define LV_DRV_INDEV_I2C_WR(data)           /*i2c_wr(data)*/      /*Write a byte to the I1C bus*/
+#define LV_DRV_INDEV_I2C_READ(last_read)    0 /*i2c_rd()*/        /*Read a byte from the I2C bud*/
+
+
+/*********************
+ *  DISPLAY DRIVERS
+ *********************/
+
+/*-------------------
+ *  Monitor of PC
+ *-------------------*/
+#ifndef USE_MONITOR
+#  define USE_MONITOR         1
+#endif
+
+#if USE_MONITOR
+#  define MONITOR_HOR_RES     LV_HOR_RES_MAX
+#  define MONITOR_VER_RES     LV_VER_RES_MAX
+
+/* Scale window by this factor (useful when simulating small screens) */
+#  define MONITOR_ZOOM        1
+
+/* Used to test true double buffering with only address changing.
+ * Set LV_VDB_SIZE = (LV_HOR_RES * LV_VER_RES) and  LV_VDB_DOUBLE = 1 and LV_COLOR_DEPTH = 32" */
+#  define MONITOR_DOUBLE_BUFFERED 0
+
+/*Eclipse: <SDL2/SDL.h>    Visual Studio: <SDL.h>*/
+#  define MONITOR_SDL_INCLUDE_PATH    <SDL2/SDL.h>
+
+/*Different rendering might be used if running in a Virtual machine*/
+#  define MONITOR_VIRTUAL_MACHINE 0
+
+/*Open two windows to test multi display support*/
+#  define MONITOR_DUAL            0
+#endif
+
+/*-----------------------------------
+ *  Native Windows (including mouse)
+ *----------------------------------*/
+#ifndef USE_WINDOWS
+#  define USE_WINDOWS       0
+#endif
+
+#define USE_WINDOWS         0
+#if USE_WINDOWS
+#  define WINDOW_HOR_RES      480
+#  define WINDOW_VER_RES      320
+#endif
+
+/*----------------
+ *    SSD1963
+ *--------------*/
+#ifndef USE_SSD1963
+#  define USE_SSD1963         0
+#endif
+
+#if USE_SSD1963
+#  define SSD1963_HOR_RES     LV_HOR_RES
+#  define SSD1963_VER_RES     LV_VER_RES
+#  define SSD1963_HT          531
+#  define SSD1963_HPS         43
+#  define SSD1963_LPS         8
+#  define SSD1963_HPW         10
+#  define SSD1963_VT          288
+#  define SSD1963_VPS         12
+#  define SSD1963_FPS         4
+#  define SSD1963_VPW         10
+#  define SSD1963_HS_NEG      0   /*Negative hsync*/
+#  define SSD1963_VS_NEG      0   /*Negative vsync*/
+#  define SSD1963_ORI         0   /*0, 90, 180, 270*/
+#  define SSD1963_COLOR_DEPTH 16
+#endif
+
+/*----------------
+ *    R61581
+ *--------------*/
+#ifndef USE_R61581
+#  define USE_R61581          0
+#endif
+
+#if USE_R61581
+#  define R61581_HOR_RES      LV_HOR_RES
+#  define R61581_VER_RES      LV_VER_RES
+#  define R61581_HSPL         0       /*HSYNC signal polarity*/
+#  define R61581_HSL          10      /*HSYNC length (Not Implemented)*/
+#  define R61581_HFP          10      /*Horitontal Front poarch (Not Implemented)*/
+#  define R61581_HBP          10      /*Horitontal Back poarch (Not Implemented */
+#  define R61581_VSPL         0       /*VSYNC signal polarity*/
+#  define R61581_VSL          10      /*VSYNC length (Not Implemented)*/
+#  define R61581_VFP          8       /*Vertical Front poarch*/
+#  define R61581_VBP          8       /*Vertical Back poarch */
+#  define R61581_DPL          0       /*DCLK signal polarity*/
+#  define R61581_EPL          1       /*ENABLE signal polarity*/
+#  define R61581_ORI          0       /*0, 180*/
+#  define R61581_LV_COLOR_DEPTH 16    /*Fix 16 bit*/
+#endif
+
+/*------------------------------
+ *  ST7565 (Monochrome, low res.)
+ *-----------------------------*/
+#ifndef USE_ST7565
+#  define USE_ST7565          0
+#endif
+
+#if USE_ST7565
+/*No settings*/
+#endif  /*USE_ST7565*/
+
+/*-----------------------------------------
+ *  Linux frame buffer device (/dev/fbx)
+ *-----------------------------------------*/
+#ifndef USE_FBDEV
+#  define USE_FBDEV           1
+#endif
+
+#if USE_FBDEV
+#  define FBDEV_PATH          "/dev/fb0"
+#endif
+
+/*********************
+ *  INPUT DEVICES
+ *********************/
+
+/*--------------
+ *    XPT2046
+ *--------------*/
+#ifndef USE_XPT2046
+#  define USE_XPT2046         0
+#endif
+
+#if USE_XPT2046
+#  define XPT2046_HOR_RES     480
+#  define XPT2046_VER_RES     320
+#  define XPT2046_X_MIN       200
+#  define XPT2046_Y_MIN       200
+#  define XPT2046_X_MAX       3800
+#  define XPT2046_Y_MAX       3800
+#  define XPT2046_AVG         4
+#  define XPT2046_INV         0
+#endif
+
+/*-----------------
+ *    FT5406EE8
+ *-----------------*/
+#ifndef USE_FT5406EE8
+#  define USE_FT5406EE8       0
+#endif
+
+#if USE_FT5406EE8
+# define FT5406EE8_I2C_ADR   0x38                  /*7 bit address*/
+#endif
+
+/*---------------
+ *  AD TOUCH
+ *--------------*/
+#ifndef USE_AD_TOUCH
+#  define USE_AD_TOUCH        0
+#endif
+
+#if USE_AD_TOUCH
+/*No settings*/
+#endif
+
+
+/*---------------------------------------
+ * Mouse or touchpad on PC (using SDL)
+ *-------------------------------------*/
+#ifndef USE_MOUSE
+#  define USE_MOUSE           1
+#endif
+
+#if USE_MOUSE
+/*No settings*/
+#endif
+
+/*-------------------------------------------
+ * Mousewheel as encoder on PC (using SDL)
+ *------------------------------------------*/
+#ifndef USE_MOUSEWHEEL
+#  define USE_MOUSEWHEEL      1
+#endif
+
+#if USE_MOUSEWHEEL
+/*No settings*/
+#endif
+
+/*-------------------------------------------------
+ * Touchscreen as libinput interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_LIBINPUT
+#  define USE_LIBINPUT           0
+#endif
+
+#if USE_LIBINPUT
+#  define LIBINPUT_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#endif  /*USE_LIBINPUT*/
+
+/*-------------------------------------------------
+ * Mouse or touchpad as evdev interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_EVDEV
+#  define USE_EVDEV           0
+#endif
+
+#if USE_EVDEV
+#  define EVDEV_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#  define EVDEV_SWAP_AXES         0               /*Swap the x and y axes of the touchscreen*/
+
+#  define EVDEV_SCALE             0               /* Scale input, e.g. if touchscreen resolution does not match display resolution */
+#  if EVDEV_SCALE
+#    define EVDEV_SCALE_HOR_RES     (4096)          /* Horizontal resolution of touchscreen */
+#    define EVDEV_SCALE_VER_RES     (4096)          /* Vertical resolution of touchscreen */
+#  endif  /*EVDEV_SCALE*/
+
+#  define EVDEV_CALIBRATE         0               /*Scale and offset the touchscreen coordinates by using maximum and minimum values for each axis*/
+#  if EVDEV_CALIBRATE
+#    define EVDEV_HOR_MIN   3800                    /*If EVDEV_XXX_MIN > EVDEV_XXX_MAX the XXX axis is automatically inverted*/
+#    define EVDEV_HOR_MAX   200
+#    define EVDEV_VER_MIN   200
+#    define EVDEV_VER_MAX   3800
+#  endif  /*EVDEV_SCALE*/
+#endif  /*USE_EVDEV*/
+
+/*-------------------------------
+ *   Keyboard of a PC (using SDL)
+ *------------------------------*/
+#ifndef USE_KEYBOARD
+#  define USE_KEYBOARD        1
+#endif
+
+#if USE_KEYBOARD
+/*No settings*/
+#endif
+
+#endif  /*LV_DRV_CONF_H*/
+
+#endif /*End of "Content enable"*/

samples/gui/lvgl-native-ui-app/main.c

@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file main
+ *
+ */
+
+/*********************
+ *      INCLUDES
+ *********************/
+#define _DEFAULT_SOURCE /* needed for usleep() */
+#include <stdlib.h>
+#include <unistd.h>
+#define SDL_MAIN_HANDLED        /*To fix SDL's "undefined reference to WinMain" issue*/
+#include <SDL2/SDL.h>
+#include "lvgl/lvgl.h"
+#include "lv_drivers/display/monitor.h"
+#include "lv_drivers/indev/mouse.h"
+#include "lv_drivers/indev/mousewheel.h"
+#include "lv_drivers/indev/keyboard.h"
+
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/*On OSX SDL needs different handling*/
+#if defined(__APPLE__) && defined(TARGET_OS_MAC)
+# if __APPLE__ && TARGET_OS_MAC
+#define SDL_APPLE
+# endif
+#endif
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void hal_init(void);
+static void btn_event_cb(lv_obj_t * btn, lv_event_t event);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+uint32_t count = 0;
+char count_str[11] = { 0 };
+lv_obj_t *hello_world_label;
+lv_obj_t *count_label;
+lv_obj_t * btn1;
+lv_obj_t * label_count1;
+int label_count1_value = 0;
+char label_count1_str[11] = { 0 };
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+int main(int argc, char ** argv)
+{
+    (void) argc;    /*Unused*/
+    (void) argv;    /*Unused*/
+
+    /*Initialize LittlevGL*/
+    lv_init();
+
+    /*Initialize the HAL (display, input devices, tick) for LittlevGL*/
+    hal_init();
+
+    hello_world_label = lv_label_create(lv_disp_get_scr_act(NULL), NULL);
+    lv_label_set_text(hello_world_label, "Hello world!");
+    lv_obj_align(hello_world_label, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);
+
+    count_label = lv_label_create(lv_disp_get_scr_act(NULL), NULL);
+    lv_obj_align(count_label, NULL, LV_ALIGN_IN_TOP_MID, 0, 0);
+    btn1 = lv_btn_create(lv_disp_get_scr_act(NULL), NULL); /*Create a button on the currently loaded screen*/
+    lv_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, 20); /*Align below the label*/
+
+    /*Create a label on the button*/
+    lv_obj_t * btn_label = lv_label_create(btn1, NULL);
+    lv_label_set_text(btn_label, "Click ++");
+
+    label_count1 = lv_label_create(lv_disp_get_scr_act(NULL), NULL);
+    lv_label_set_text(label_count1, "0");
+    lv_obj_align(label_count1, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
+    while(1) {
+        /* Periodically call the lv_task handler.
+         * It could be done in a timer interrupt or an OS task too.*/
+        if ((count % 100) == 0) {
+            sprintf(count_str, "%d", count/ 100);
+            lv_label_set_text(count_label, count_str);
+        }
+        lv_task_handler();
+        ++count;
+        usleep(10 * 1000); /*Just to let the system breath*/
+    }
+    return 0;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+
+/**
+ * Initialize the Hardware Abstraction Layer (HAL) for the Littlev graphics library
+ */
+static void hal_init(void)
+{
+    /* Use the 'monitor' driver which creates window on PC's monitor to simulate a display*/
+    monitor_init();
+
+    /*Create a display buffer*/
+    static lv_disp_buf_t disp_buf1;
+    static lv_color_t buf1_1[320*10];
+    lv_disp_buf_init(&disp_buf1, buf1_1, NULL, 320*10);
+
+    /*Create a display*/
+    lv_disp_drv_t disp_drv;
+    lv_disp_drv_init(&disp_drv);            /*Basic initialization*/
+    disp_drv.buffer = &disp_buf1;
+    disp_drv.flush_cb = monitor_flush;    /*Used when `LV_VDB_SIZE != 0` in lv_conf.h (buffered drawing)*/
+    //    disp_drv.hor_res = 200;
+    //    disp_drv.ver_res = 100;
+    lv_disp_drv_register(&disp_drv);
+
+    /* Add the mouse as input device
+     * Use the 'mouse' driver which reads the PC's mouse*/
+    mouse_init();
+    lv_indev_drv_t indev_drv;
+    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
+    indev_drv.type = LV_INDEV_TYPE_POINTER;
+    indev_drv.read_cb = mouse_read;         /*This function will be called periodically (by the library) to get the mouse position and state*/
+    lv_indev_drv_register(&indev_drv);
+}
+
+static void btn_event_cb(lv_obj_t * btn, lv_event_t event)
+{
+    if(event == LV_EVENT_RELEASED) {
+        label_count1_value++;
+        sprintf(label_count1_str, "%d", label_count1_value);
+        lv_label_set_text(label_count1, label_count1_str);
+    }
+}

samples/gui/lvgl-native-ui-app/system_header.h

@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+
+int time_get_ms();

samples/gui/wasm-apps/lvgl-compatible/Makefile

@@ -0,0 +1,39 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+CC = emcc
+APP_DIR = ${shell pwd}
+IWASM_DIR=../../../../core/iwasm
+CFLAGS += -O3 \
+	  -Wno-int-conversion \
+	  -DLV_CONF_INCLUDE_SIMPLE \
+	  -I$(APP_DIR)/src/ \
+	  -I$(IWASM_DIR)/lib/app-libs/base/ \
+	  -I$(IWASM_DIR)/lib/native-interface/ \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/sensor \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/gui \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/connection
+
+SRCS += $(APP_DIR)/src/main.c
+
+# For app size consideration, not all but necessary app libs are included
+SRCS += $(IWASM_DIR)/lib/app-libs/base/timer.c
+SRCS += $(IWASM_DIR)/lib/app-libs/extension/gui/src/*.c
+
+all: 
+	@$(CC) $(CFLAGS) $(SRCS) \
+    -s WASM=1 -s SIDE_MODULE=1 -s ASSERTIONS=1 -s STACK_OVERFLOW_CHECK=2 \
+    -s TOTAL_MEMORY=65536 -s TOTAL_STACK=2048\
+    -s "EXPORTED_FUNCTIONS=['_on_init', '_on_timer_callback', '_on_widget_event']" \
+    -o ui_app_lvgl_compatible.wasm

samples/gui/wasm-apps/lvgl-compatible/src/main.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include "wasm_app.h"
+#include "lvgl.h"
+
+extern char g_widget_text[];
+
+static void btn_event_cb(lv_obj_t *btn, lv_event_t event);
+
+uint32_t count = 0;
+char count_str[11] = { 0 };
+lv_obj_t *hello_world_label;
+lv_obj_t *count_label;
+lv_obj_t *btn1;
+lv_obj_t *label_count1;
+int label_count1_value = 0;
+char label_count1_str[11] = { 0 };
+
+void timer1_update(user_timer_t timer1)
+{
+    if ((count % 100) == 0) {
+        sprintf(count_str, "%d", count / 100);
+        lv_label_set_text(count_label, count_str);
+    }
+    ++count;
+}
+
+void on_init()
+{
+    char *text;
+
+    hello_world_label = lv_label_create(NULL, NULL);
+    lv_label_set_text(hello_world_label, "Hello world!");
+    text = lv_label_get_text(hello_world_label);
+    printf("Label text %lu %s \n", strlen(text), text);
+    lv_obj_align(hello_world_label, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);
+
+    count_label = lv_label_create(NULL, NULL);
+    lv_obj_align(count_label, NULL, LV_ALIGN_IN_TOP_MID, 0, 0);
+
+    btn1 = lv_btn_create(NULL, NULL); /*Create a button on the currently loaded screen*/
+    lv_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, 0); /*Align below the label*/
+
+    /*Create a label on the button*/
+    lv_obj_t *btn_label = lv_label_create(btn1, NULL);
+    lv_label_set_text(btn_label, "Click ++");
+
+    label_count1 = lv_label_create(NULL, NULL);
+    lv_label_set_text(label_count1, "0");
+    lv_obj_align(label_count1, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
+
+    /* set up a timer */
+    user_timer_t timer;
+    timer = api_timer_create(10, true, false, timer1_update);
+    api_timer_restart(timer, 10);
+}
+
+static void btn_event_cb(lv_obj_t *btn, lv_event_t event)
+{
+    if(event == LV_EVENT_RELEASED) {
+        label_count1_value++;
+        sprintf(label_count1_str, "%d", label_count1_value);
+        lv_label_set_text(label_count1, label_count1_str);
+    }
+}

samples/gui/wasm-apps/wgl/Makefile

@@ -0,0 +1,39 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+CC = emcc
+APP_DIR = ${shell pwd}
+IWASM_DIR=../../../../core/iwasm
+CFLAGS += -O3 \
+	  -Wno-int-conversion \
+	  -DLV_CONF_INCLUDE_SIMPLE \
+	  -I$(APP_DIR)/src/ \
+	  -I$(IWASM_DIR)/lib/app-libs/base/ \
+	  -I$(IWASM_DIR)/lib/native-interface/ \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/sensor \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/gui \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/connection
+
+SRCS += $(APP_DIR)/src/main.c
+
+# For app size consideration, not all but necessary app libs are included
+SRCS += $(IWASM_DIR)/lib/app-libs/base/timer.c
+SRCS += $(IWASM_DIR)/lib/app-libs/extension/gui/src/*.c
+
+all: 
+	@$(CC) $(CFLAGS) $(SRCS) \
+    -s WASM=1 -s SIDE_MODULE=1 -s ASSERTIONS=1 -s STACK_OVERFLOW_CHECK=2 \
+    -s TOTAL_MEMORY=65536 -s TOTAL_STACK=2048\
+    -s "EXPORTED_FUNCTIONS=['_on_init', '_on_timer_callback', '_on_widget_event']" \
+    -o ui_app.wasm

samples/gui/wasm-apps/wgl/src/main.c

@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include "wasm_app.h"
+
+static void btn_event_cb(wgl_obj_t btn, wgl_event_t event);
+
+uint32_t count = 0;
+char count_str[11] = { 0 };
+wgl_obj_t hello_world_label;
+wgl_obj_t count_label;
+wgl_obj_t btn1;
+wgl_obj_t label_count1;
+int label_count1_value = 0;
+char label_count1_str[11] = { 0 };
+
+void timer1_update(user_timer_t timer1)
+{
+    if ((count % 100) == 0) {
+        sprintf(count_str, "%d", count / 100);
+        wgl_label_set_text(count_label, count_str);
+    }
+    ++count;
+}
+
+void on_init()
+{
+    hello_world_label = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_label_set_text(hello_world_label, "Hello world!");
+    wgl_obj_align(hello_world_label, (wgl_obj_t)NULL, WGL_ALIGN_IN_TOP_LEFT, 0, 0);
+
+    count_label = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_obj_align(count_label, (wgl_obj_t)NULL, WGL_ALIGN_IN_TOP_MID, 0, 0);
+
+    btn1 = wgl_btn_create((wgl_obj_t)NULL, (wgl_obj_t)NULL); /*Create a button on the currently loaded screen*/
+    wgl_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
+    wgl_obj_align(btn1, (wgl_obj_t)NULL, WGL_ALIGN_CENTER, 0, 0); /*Align below the label*/
+
+    /*Create a label on the button*/
+    wgl_obj_t btn_label = wgl_label_create(btn1, (wgl_obj_t)NULL);
+    wgl_label_set_text(btn_label, "Click ++");
+
+    label_count1 = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_label_set_text(label_count1, "0");
+    wgl_obj_align(label_count1, (wgl_obj_t)NULL, WGL_ALIGN_IN_BOTTOM_MID, 0, 0);
+
+    /* set up a timer */
+    user_timer_t timer;
+    timer = api_timer_create(10, true, false, timer1_update);
+    api_timer_restart(timer, 10);
+}
+
+static void btn_event_cb(wgl_obj_t btn, wgl_event_t event)
+{
+    if(event == WGL_EVENT_RELEASED) {
+        label_count1_value++;
+        sprintf(label_count1_str, "%d", label_count1_value);
+        wgl_label_set_text(label_count1, label_count1_str);
+
+        //wgl_cont_set_fit4(btn, WGL_FIT_FLOOD, WGL_FIT_FLOOD, WGL_FIT_FLOOD, WGL_FIT_FLOOD);
+        //wgl_obj_clean(btn);
+    }
+}

samples/gui/wasm-runtime-wgl/linux-build/CMakeLists.txt

@@ -0,0 +1,133 @@
+cmake_minimum_required (VERSION 2.8)
+
+project (wasm_runtime_wgl)
+
+set(REPO_ROOT_DIR ${CMAKE_CURRENT_LIST_DIR}/../../../..)
+set(WASM_DIR  ${REPO_ROOT_DIR}/core/iwasm)
+set(APP_MGR_DIR ${REPO_ROOT_DIR}/core/app-mgr)
+set(SHARED_DIR ${REPO_ROOT_DIR}/core/shared-lib)
+
+set (lv_drivers_name lv_drivers)
+set (lv_name lvgl)
+set (LV_DRIVERS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/linux/${lv_drivers_name})
+set (LVGL_DIR ${WASM_DIR}/lib/3rdparty/${lv_name})
+
+if ((NOT EXISTS ${LVGL_DIR}) OR (NOT EXISTS ${LV_DRIVERS_DIR}))
+        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt.in ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers/CMakeLists.txt)
+
+        execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers )
+        if(result)
+                message(FATAL_ERROR "CMake step for lvgl drivers failed: ${result}")
+        endif()
+        execute_process(COMMAND ${CMAKE_COMMAND} --build .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers )
+        if(result)
+                message(FATAL_ERROR "Build step for lvgl drivers failed: ${result}")
+        endif()
+endif()
+
+file(GLOB_RECURSE LV_DRIVERS_SOURCES "${LV_DRIVERS_DIR}/*.c" )
+
+set (TARGET_PLATFORM "linux")
+
+# Reset default linker flags
+set (CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "")
+set (CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS "")
+
+# Enable repl mode if want to test spec cases
+# add_definitions(-DWASM_ENABLE_REPL)
+
+if (NOT ("$ENV{VALGRIND}" STREQUAL "YES"))
+  add_definitions(-DNVALGRIND)
+endif ()
+
+# Currently build as 32-bit by default.
+set (BUILD_AS_64BIT_SUPPORT "NO")
+#set (BUILD_AS_64BIT_SUPPORT "YES")
+
+if (CMAKE_SIZEOF_VOID_P EQUAL 8)
+if (${BUILD_AS_64BIT_SUPPORT} STREQUAL "YES")
+  # Add -fPIC flag if build as 64-bit
+  set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
+  set (CMAKE_SHARED_LIBRARY_LINK_C_FLAGS "${CMAKE_SHARED_LIBRARY_LINK_C_FLAGS} -fPIC")
+else ()
+  add_definitions (-m32)
+  set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -m32")
+  set (CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -m32")
+endif ()
+endif ()
+
+if (NOT CMAKE_BUILD_TYPE)
+SET(CMAKE_BUILD_TYPE Debug)
+endif (NOT CMAKE_BUILD_TYPE)
+message ("CMAKE_BUILD_TYPE = " ${CMAKE_BUILD_TYPE})
+
+if (NOT PLATFORM)
+SET(PLATFORM linux)
+endif (NOT PLATFORM)
+message ("PLATFORM = " ${PLATFORM})
+
+set (CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gc-sections")
+set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -ffunction-sections -fdata-sections -Wall -Wno-unused-parameter -Wno-pedantic")
+
+
+enable_language (ASM)
+
+include (${WASM_DIR}/runtime/platform/${TARGET_PLATFORM}/platform.cmake)
+include (${WASM_DIR}/runtime/utils/utils.cmake)
+include (${WASM_DIR}/runtime/vmcore-wasm/vmcore.cmake)
+include (${WASM_DIR}/lib/native/base/wasm_lib_base.cmake)
+include (${WASM_DIR}/lib/native/libc/wasm_libc.cmake)
+include (${WASM_DIR}/lib/native/extension/sensor/wasm_lib_sensor.cmake)
+include (${WASM_DIR}/lib/native/extension/gui/wasm_lib_gui.cmake)
+include (${WASM_DIR}/lib/native/extension/connection/wasm_lib_conn.cmake)
+include (${WASM_DIR}/lib/native/extension/connection/${TARGET_PLATFORM}/connection_mgr.cmake)
+include (${WASM_DIR}/lib/native-interface/native_interface.cmake)
+include (${APP_MGR_DIR}/app-manager/app_mgr.cmake)
+include (${APP_MGR_DIR}/app-mgr-shared/app_mgr_shared.cmake)
+include (${SHARED_DIR}/platform/${TARGET_PLATFORM}/shared_platform.cmake)
+include (${SHARED_DIR}/utils/shared_utils.cmake)
+include (${SHARED_DIR}/mem-alloc/mem_alloc.cmake)
+include (${SHARED_DIR}/coap/lib_coap.cmake)
+
+set (PROJECT_SRC_DIR ${CMAKE_CURRENT_LIST_DIR}/../src/platform/${TARGET_PLATFORM})
+
+include_directories(${SHARED_DIR}/include)
+
+add_definitions (-DWASM_ENABLE_BASE_LIB)
+add_definitions (-Dattr_container_malloc=bh_malloc)
+add_definitions (-Dattr_container_free=bh_free)
+
+add_library (vmlib
+             ${WASM_PLATFORM_LIB_SOURCE}
+             ${WASM_UTILS_LIB_SOURCE}
+             ${VMCORE_LIB_SOURCE}
+             ${WASM_LIBC_SOURCE}
+             ${APP_MGR_SOURCE}
+             ${WASM_LIB_BASE_SOURCE}
+             ${WASM_LIB_EXT_SOURCE}
+             ${WASM_LIB_SENSOR_SOURCE}
+             ${WASM_LIB_GUI_SOURCE}
+             ${WASM_LIB_CONN_SOURCE}
+             ${WASM_LIB_CONN_MGR_SOURCE}
+             ${PLATFORM_SHARED_SOURCE}
+             ${UTILS_SHARED_SOURCE}
+             ${MEM_ALLOC_SHARED_SOURCE}
+             ${NATIVE_INTERFACE_SOURCE}
+             )
+
+set (SOURCES
+     ${PROJECT_SRC_DIR}/main.c
+     ${PROJECT_SRC_DIR}/iwasm_main.c
+     ${PROJECT_SRC_DIR}/../../ext_lib_export.c
+     ${LV_DRIVERS_SOURCES}
+     )
+
+add_executable (wasm_runtime_wgl ${SOURCES})
+
+target_link_libraries (wasm_runtime_wgl vmlib -lm -ldl -lpthread -lSDL2)
+#target_link_libraries(wasm_runtime_wgl PRIVATE SDL2 )
+

samples/gui/wasm-runtime-wgl/linux-build/CMakeLists.txt.in

@@ -0,0 +1,41 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 2.8.2)
+
+project(lvgl_download NONE)
+
+include(ExternalProject)
+
+ExternalProject_Add(${lv_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lvgl.git
+    GIT_TAG        ""
+    BINARY_DIR     ""
+    SOURCE_DIR            "${LVGL_DIR}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )
+
+ExternalProject_Add(${lv_drivers_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lv_drivers.git
+    GIT_TAG        ""
+    BINARY_DIR     ""
+    SOURCE_DIR            "${LV_DRIVERS_DIR}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )

samples/gui/wasm-runtime-wgl/src/ext_lib_export.c

@@ -0,0 +1,12 @@
+#include "lib_export.h"
+#include "native_interface.h"
+#include "connection_api.h"
+#include "gui_api.h"
+
+static NativeSymbol extended_native_symbol_defs[] = {
+#include "runtime_sensor.inl"
+#include "connection.inl"
+#include "wamr_gui.inl"
+};
+
+#include "ext_lib_export.h"

samples/gui/wasm-runtime-wgl/src/platform/linux/iwasm_main.c

@@ -0,0 +1,512 @@
+
+#ifndef CONNECTION_UART
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#else
+#include <termios.h>
+#endif
+
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <strings.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <unistd.h>
+#include <strings.h>
+
+#include "runtime_lib.h"
+#include "runtime_timer.h"
+#include "native_interface.h"
+#include "app_manager_export.h"
+#include "bh_common.h"
+#include "bh_queue.h"
+#include "bh_thread.h"
+#include "bh_memory.h"
+#include "runtime_sensor.h"
+#include "attr_container.h"
+#include "module_wasm_app.h"
+#include "wasm_export.h"
+
+#include "lv_drivers/display/monitor.h"
+#include "lv_drivers/indev/mouse.h"
+
+#define MAX 2048
+
+#ifndef CONNECTION_UART
+#define SA struct sockaddr
+static char *host_address = "127.0.0.1";
+static int port = 8888;
+#else
+static char *uart_device = "/dev/ttyS2";
+static int baudrate = B115200;
+#endif
+
+extern void * thread_timer_check(void *);
+extern void init_sensor_framework();
+extern int aee_host_msg_callback(void *msg, uint16_t msg_len);
+extern bool init_connection_framework();
+extern void wgl_init();
+
+#ifndef CONNECTION_UART
+int listenfd = -1;
+int sockfd = -1;
+static pthread_mutex_t sock_lock = PTHREAD_MUTEX_INITIALIZER;
+#else
+int uartfd = -1;
+#endif
+
+#ifndef CONNECTION_UART
+static bool server_mode = false;
+
+// Function designed for chat between client and server.
+void* func(void* arg)
+{
+    char buff[MAX];
+    int n;
+    struct sockaddr_in servaddr;
+
+    while (1) {
+        if (sockfd != -1)
+            close(sockfd);
+        // socket create and verification
+        sockfd = socket(AF_INET, SOCK_STREAM, 0);
+        if (sockfd == -1) {
+            printf("socket creation failed...\n");
+            return NULL;
+        } else
+            printf("Socket successfully created..\n");
+        bzero(&servaddr, sizeof(servaddr));
+        // assign IP, PORT
+        servaddr.sin_family = AF_INET;
+        servaddr.sin_addr.s_addr = inet_addr(host_address);
+        servaddr.sin_port = htons(port);
+
+        // connect the client socket to server socket
+        if (connect(sockfd, (SA*) &servaddr, sizeof(servaddr)) != 0) {
+            printf("connection with the server failed...\n");
+            sleep(10);
+            continue;
+        } else {
+            printf("connected to the server..\n");
+        }
+
+        // infinite loop for chat
+        for (;;) {
+            bzero(buff, MAX);
+
+            // read the message from client and copy it in buffer
+            n = read(sockfd, buff, sizeof(buff));
+            // print buffer which contains the client contents
+            //fprintf(stderr, "recieved %d bytes from host: %s", n, buff);
+
+            // socket disconnected
+            if (n <= 0)
+                break;
+
+            aee_host_msg_callback(buff, n);
+        }
+    }
+
+    // After chatting close the socket
+    close(sockfd);
+}
+
+static bool host_init()
+{
+    return true;
+}
+
+int host_send(void * ctx, const char *buf, int size)
+{
+    int ret;
+
+    if (pthread_mutex_trylock(&sock_lock) == 0) {
+        if (sockfd == -1) {
+            pthread_mutex_unlock(&sock_lock);
+            return 0;
+        }
+
+        ret = write(sockfd, buf, size);
+
+        pthread_mutex_unlock(&sock_lock);
+        return ret;
+    }
+
+    return -1;
+}
+
+void host_destroy()
+{
+    if (server_mode)
+        close(listenfd);
+
+    pthread_mutex_lock(&sock_lock);
+    close(sockfd);
+    pthread_mutex_unlock(&sock_lock);
+}
+
+host_interface interface = {
+                             .init = host_init,
+                             .send = host_send,
+                             .destroy = host_destroy
+                           };
+
+void* func_server_mode(void* arg)
+{
+    int clilent;
+    struct sockaddr_in serv_addr, cli_addr;
+    int n;
+    char buff[MAX];
+
+    struct sigaction sa;
+    sa.sa_handler = SIG_IGN;
+    sigaction(SIGPIPE, &sa, 0);
+
+    /* First call to socket() function */
+    listenfd = socket(AF_INET, SOCK_STREAM, 0);
+
+    if (listenfd < 0) {
+        perror("ERROR opening socket");
+        exit(1);
+    }
+
+    /* Initialize socket structure */
+    bzero((char *) &serv_addr, sizeof(serv_addr));
+
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_addr.s_addr = INADDR_ANY;
+    serv_addr.sin_port = htons(port);
+
+    /* Now bind the host address using bind() call.*/
+    if (bind(listenfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
+        perror("ERROR on binding");
+        exit(1);
+    }
+
+    listen(listenfd, 5);
+    clilent = sizeof(cli_addr);
+
+    while (1) {
+        pthread_mutex_lock(&sock_lock);
+
+        sockfd = accept(listenfd, (struct sockaddr *) &cli_addr, &clilent);
+
+        pthread_mutex_unlock(&sock_lock);
+
+        if (sockfd < 0) {
+            perror("ERROR on accept");
+            exit(1);
+        }
+
+        printf("connection established!\n");
+
+        for (;;) {
+            bzero(buff, MAX);
+
+            // read the message from client and copy it in buffer
+            n = read(sockfd, buff, sizeof(buff));
+
+            // socket disconnected
+            if (n <= 0) {
+                pthread_mutex_lock(&sock_lock);
+                close(sockfd);
+                sockfd = -1;
+                pthread_mutex_unlock(&sock_lock);
+
+                sleep(2);
+                break;
+            }
+
+            aee_host_msg_callback(buff, n);
+        }
+    }
+}
+
+#else
+static int parse_baudrate(int baud)
+{
+    switch (baud) {
+        case 9600:
+            return B9600;
+        case 19200:
+            return B19200;
+        case 38400:
+            return B38400;
+        case 57600:
+            return B57600;
+        case 115200:
+            return B115200;
+        case 230400:
+            return B230400;
+        case 460800:
+            return B460800;
+        case 500000:
+            return B500000;
+        case 576000:
+            return B576000;
+        case 921600:
+            return B921600;
+        case 1000000:
+            return B1000000;
+        case 1152000:
+            return B1152000;
+        case 1500000:
+            return B1500000;
+        case 2000000:
+            return B2000000;
+        case 2500000:
+            return B2500000;
+        case 3000000:
+            return B3000000;
+        case 3500000:
+            return B3500000;
+        case 4000000:
+            return B4000000;
+        default:
+            return -1;
+    }
+}
+static bool uart_init(const char *device, int baudrate, int *fd)
+{
+    int uart_fd;
+    struct termios uart_term;
+
+    uart_fd = open(device, O_RDWR | O_NOCTTY);
+
+    if (uart_fd <= 0)
+        return false;
+
+    memset(&uart_term, 0, sizeof(uart_term));
+    uart_term.c_cflag = baudrate | CS8 | CLOCAL | CREAD;
+    uart_term.c_iflag = IGNPAR;
+    uart_term.c_oflag = 0;
+
+    /* set noncanonical mode */
+    uart_term.c_lflag = 0;
+    uart_term.c_cc[VTIME] = 30;
+    uart_term.c_cc[VMIN] = 1;
+    tcflush(uart_fd, TCIFLUSH);
+
+    if (tcsetattr(uart_fd, TCSANOW, &uart_term) != 0) {
+        close(uart_fd);
+        return false;
+    }
+
+    *fd = uart_fd;
+
+    return true;
+}
+
+static void *func_uart_mode(void *arg)
+{
+    int n;
+    char buff[MAX];
+
+    if (!uart_init(uart_device, baudrate, &uartfd)) {
+        printf("open uart fail! %s\n", uart_device);
+        return NULL;
+    }
+
+    for (;;) {
+        bzero(buff, MAX);
+
+        n = read(uartfd, buff, sizeof(buff));
+
+        if (n <= 0) {
+            close(uartfd);
+            uartfd = -1;
+            break;
+        }
+
+        aee_host_msg_callback(buff, n);
+    }
+
+    return NULL;
+}
+
+static int uart_send(void * ctx, const char *buf, int size)
+{
+    int ret;
+
+    ret = write(uartfd, buf, size);
+
+    return ret;
+}
+
+static void uart_destroy()
+{
+    close(uartfd);
+}
+
+static host_interface interface = { .send = uart_send, .destroy = uart_destroy };
+
+#endif
+
+static char global_heap_buf[270 * 1024] = { 0 };
+
+static void showUsage()
+{
+#ifndef CONNECTION_UART
+     printf("Usage:\n");
+     printf("\nWork as TCP server mode:\n");
+     printf("\tvgl_wasm_runtime -s|--server_mode -p|--port <Port>\n");
+     printf("where\n");
+     printf("\t<Port> represents the port that would be listened on and the default is 8888\n");
+     printf("\nWork as TCP client mode:\n");
+     printf("\tvgl_wasm_runtime -a|--host_address <Host Address> -p|--port <Port>\n");
+     printf("where\n");
+     printf("\t<Host Address> represents the network address of host and the default is 127.0.0.1\n");
+     printf("\t<Port> represents the listen port of host and the default is 8888\n");
+#else
+     printf("Usage:\n");
+     printf("\tvgl_wasm_runtime -u <Uart Device> -b <Baudrate>\n\n");
+     printf("where\n");
+     printf("\t<Uart Device> represents the UART device name and the default is /dev/ttyS2\n");
+     printf("\t<Baudrate> represents the UART device baudrate and the default is 115200\n");
+#endif
+}
+
+static bool parse_args(int argc, char *argv[])
+{
+    int c;
+
+    while (1) {
+        int optIndex = 0;
+        static struct option longOpts[] = { 
+#ifndef CONNECTION_UART
+            { "server_mode",    no_argument,       NULL, 's' },
+            { "host_address",   required_argument, NULL, 'a' },
+            { "port",           required_argument, NULL, 'p' },
+#else
+            { "uart",           required_argument, NULL, 'u' },
+            { "baudrate",       required_argument, NULL, 'b' },
+#endif
+            { "help",           required_argument, NULL, 'h' },
+            { 0, 0, 0, 0 } 
+        };
+
+        c = getopt_long(argc, argv, "sa:p:u:b:h", longOpts, &optIndex);
+        if (c == -1)
+            break;
+
+        switch (c) {
+#ifndef CONNECTION_UART
+            case 's':
+                server_mode = true;
+                break;
+            case 'a':
+                host_address = optarg;
+                printf("host address: %s\n", host_address);
+                break;
+            case 'p':
+                port = atoi(optarg);
+                printf("port: %d\n", port);
+                break;
+#else
+            case 'u':
+                uart_device = optarg;
+                printf("uart device: %s\n", uart_device);
+                break;
+            case 'b':
+                baudrate = parse_baudrate(atoi(optarg));
+                printf("uart baudrate: %s\n", optarg);
+                break;
+#endif
+            case 'h':
+                showUsage();
+                return false;
+            default:
+                showUsage();
+                return false;
+        }
+    }
+
+    return true;
+}
+
+/**
+ * Initialize the Hardware Abstraction Layer (HAL) for the Littlev graphics library
+ */
+static void hal_init(void)
+{
+    /* Use the 'monitor' driver which creates window on PC's monitor to simulate a display*/
+    monitor_init();
+
+    /*Create a display buffer*/
+    static lv_disp_buf_t disp_buf1;
+    static lv_color_t buf1_1[480*10];
+    lv_disp_buf_init(&disp_buf1, buf1_1, NULL, 480*10);
+
+    /*Create a display*/
+    lv_disp_drv_t disp_drv;
+    lv_disp_drv_init(&disp_drv);            /*Basic initialization*/
+    disp_drv.buffer = &disp_buf1;
+    disp_drv.flush_cb = monitor_flush;
+    //    disp_drv.hor_res = 200;
+    //    disp_drv.ver_res = 100;
+    lv_disp_drv_register(&disp_drv);
+
+    /* Add the mouse as input device
+    * Use the 'mouse' driver which reads the PC's mouse*/
+    mouse_init();
+    lv_indev_drv_t indev_drv;
+    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
+    indev_drv.type = LV_INDEV_TYPE_POINTER;
+    indev_drv.read_cb = mouse_read;         /*This function will be called periodically (by the library) to get the mouse position and state*/
+    lv_indev_drv_register(&indev_drv);
+}
+
+// Driver function
+int iwasm_main(int argc, char *argv[])
+{
+    korp_thread tid;
+
+    if (!parse_args(argc, argv))
+        return -1;
+
+    if (bh_memory_init_with_pool(global_heap_buf, sizeof(global_heap_buf))
+            != 0) {
+        printf("Init global heap failed.\n");
+        return -1;
+    }
+
+    if (vm_thread_sys_init() != 0) {
+        goto fail1;
+    }
+
+    if (!init_connection_framework()) {
+        vm_thread_sys_destroy();
+        goto fail1;
+    }
+
+    wgl_init();
+
+    hal_init();
+
+    init_sensor_framework();
+
+    // timer manager
+    init_wasm_timer();
+
+#ifndef CONNECTION_UART
+    if (server_mode)
+        vm_thread_create(&tid, func_server_mode, NULL,
+        BH_APPLET_PRESERVED_STACK_SIZE);
+    else
+        vm_thread_create(&tid, func, NULL, BH_APPLET_PRESERVED_STACK_SIZE);
+#else
+    vm_thread_create(&tid, func_uart_mode, NULL, BH_APPLET_PRESERVED_STACK_SIZE);
+#endif
+
+    // TODO:
+    app_manager_startup(&interface);
+
+    fail1: bh_memory_destroy();
+    return -1;
+}

samples/gui/wasm-runtime-wgl/src/platform/linux/lv_drv_conf.h

@@ -0,0 +1,310 @@
+/**
+ * @file lv_drv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS lv_drv_conf.h
+ */
+
+#if 1 /*Set it to "1" to enable the content*/
+
+#ifndef LV_DRV_CONF_H
+#define LV_DRV_CONF_H
+
+#include "lv_conf.h"
+
+/*********************
+ * DELAY INTERFACE
+ *********************/
+#define LV_DRV_DELAY_INCLUDE  <stdint.h>            /*Dummy include by default*/
+#define LV_DRV_DELAY_US(us)  /*delay_us(us)*/       /*Delay the given number of microseconds*/
+#define LV_DRV_DELAY_MS(ms)  /*delay_ms(ms)*/       /*Delay the given number of milliseconds*/
+
+/*********************
+ * DISPLAY INTERFACE
+ *********************/
+
+/*------------
+ *  Common
+ *------------*/
+#define LV_DRV_DISP_INCLUDE         <stdint.h>           /*Dummy include by default*/
+#define LV_DRV_DISP_CMD_DATA(val)  /*pin_x_set(val)*/    /*Set the command/data pin to 'val'*/
+#define LV_DRV_DISP_RST(val)       /*pin_x_set(val)*/    /*Set the reset pin to 'val'*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_DISP_SPI_CS(val)          /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_DISP_SPI_WR_BYTE(data)    /*spi_wr(data)*/        /*Write a byte the SPI bus*/
+#define LV_DRV_DISP_SPI_WR_ARRAY(adr, n) /*spi_wr_mem(adr, n)*/  /*Write 'n' bytes to SPI bus from 'adr'*/
+
+/*------------------
+ *  Parallel port
+ *-----------------*/
+#define LV_DRV_DISP_PAR_CS(val)          /*par_cs_set(val)*/   /*Set the Parallel port's Chip select to 'val'*/
+#define LV_DRV_DISP_PAR_SLOW             /*par_slow()*/        /*Set low speed on the parallel port*/
+#define LV_DRV_DISP_PAR_FAST             /*par_fast()*/        /*Set high speed on the parallel port*/
+#define LV_DRV_DISP_PAR_WR_WORD(data)    /*par_wr(data)*/      /*Write a word to the parallel port*/
+#define LV_DRV_DISP_PAR_WR_ARRAY(adr, n) /*par_wr_mem(adr,n)*/ /*Write 'n' bytes to Parallel ports from 'adr'*/
+
+/***************************
+ * INPUT DEVICE INTERFACE
+ ***************************/
+
+/*----------
+ *  Common
+ *----------*/
+#define LV_DRV_INDEV_INCLUDE     <stdint.h>             /*Dummy include by default*/
+#define LV_DRV_INDEV_RST(val)    /*pin_x_set(val)*/     /*Set the reset pin to 'val'*/
+#define LV_DRV_INDEV_IRQ_READ    0 /*pn_x_read()*/      /*Read the IRQ pin*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_INDEV_SPI_CS(val)            /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_INDEV_SPI_XCHG_BYTE(data)    0 /*spi_xchg(val)*/     /*Write 'val' to SPI and give the read value*/
+
+/*---------
+ *  I2C
+ *---------*/
+#define LV_DRV_INDEV_I2C_START              /*i2c_start()*/       /*Make an I2C start*/
+#define LV_DRV_INDEV_I2C_STOP               /*i2c_stop()*/        /*Make an I2C stop*/
+#define LV_DRV_INDEV_I2C_RESTART            /*i2c_restart()*/     /*Make an I2C restart*/
+#define LV_DRV_INDEV_I2C_WR(data)           /*i2c_wr(data)*/      /*Write a byte to the I1C bus*/
+#define LV_DRV_INDEV_I2C_READ(last_read)    0 /*i2c_rd()*/        /*Read a byte from the I2C bud*/
+
+
+/*********************
+ *  DISPLAY DRIVERS
+ *********************/
+
+/*-------------------
+ *  Monitor of PC
+ *-------------------*/
+#ifndef USE_MONITOR
+#  define USE_MONITOR         1
+#endif
+
+#if USE_MONITOR
+#  define MONITOR_HOR_RES     LV_HOR_RES_MAX
+#  define MONITOR_VER_RES     LV_VER_RES_MAX
+
+/* Scale window by this factor (useful when simulating small screens) */
+#  define MONITOR_ZOOM        1
+
+/* Used to test true double buffering with only address changing.
+ * Set LV_VDB_SIZE = (LV_HOR_RES * LV_VER_RES) and  LV_VDB_DOUBLE = 1 and LV_COLOR_DEPTH = 32" */
+#  define MONITOR_DOUBLE_BUFFERED 0
+
+/*Eclipse: <SDL2/SDL.h>    Visual Studio: <SDL.h>*/
+#  define MONITOR_SDL_INCLUDE_PATH    <SDL2/SDL.h>
+
+/*Different rendering might be used if running in a Virtual machine*/
+#  define MONITOR_VIRTUAL_MACHINE 0
+
+/*Open two windows to test multi display support*/
+#  define MONITOR_DUAL            0
+#endif
+
+/*-----------------------------------
+ *  Native Windows (including mouse)
+ *----------------------------------*/
+#ifndef USE_WINDOWS
+#  define USE_WINDOWS       0
+#endif
+
+#define USE_WINDOWS         0
+#if USE_WINDOWS
+#  define WINDOW_HOR_RES      480
+#  define WINDOW_VER_RES      320
+#endif
+
+/*----------------
+ *    SSD1963
+ *--------------*/
+#ifndef USE_SSD1963
+#  define USE_SSD1963         0
+#endif
+
+#if USE_SSD1963
+#  define SSD1963_HOR_RES     LV_HOR_RES
+#  define SSD1963_VER_RES     LV_VER_RES
+#  define SSD1963_HT          531
+#  define SSD1963_HPS         43
+#  define SSD1963_LPS         8
+#  define SSD1963_HPW         10
+#  define SSD1963_VT          288
+#  define SSD1963_VPS         12
+#  define SSD1963_FPS         4
+#  define SSD1963_VPW         10
+#  define SSD1963_HS_NEG      0   /*Negative hsync*/
+#  define SSD1963_VS_NEG      0   /*Negative vsync*/
+#  define SSD1963_ORI         0   /*0, 90, 180, 270*/
+#  define SSD1963_COLOR_DEPTH 16
+#endif
+
+/*----------------
+ *    R61581
+ *--------------*/
+#ifndef USE_R61581
+#  define USE_R61581          0
+#endif
+
+#if USE_R61581
+#  define R61581_HOR_RES      LV_HOR_RES
+#  define R61581_VER_RES      LV_VER_RES
+#  define R61581_HSPL         0       /*HSYNC signal polarity*/
+#  define R61581_HSL          10      /*HSYNC length (Not Implemented)*/
+#  define R61581_HFP          10      /*Horitontal Front poarch (Not Implemented)*/
+#  define R61581_HBP          10      /*Horitontal Back poarch (Not Implemented */
+#  define R61581_VSPL         0       /*VSYNC signal polarity*/
+#  define R61581_VSL          10      /*VSYNC length (Not Implemented)*/
+#  define R61581_VFP          8       /*Vertical Front poarch*/
+#  define R61581_VBP          8       /*Vertical Back poarch */
+#  define R61581_DPL          0       /*DCLK signal polarity*/
+#  define R61581_EPL          1       /*ENABLE signal polarity*/
+#  define R61581_ORI          0       /*0, 180*/
+#  define R61581_LV_COLOR_DEPTH 16    /*Fix 16 bit*/
+#endif
+
+/*------------------------------
+ *  ST7565 (Monochrome, low res.)
+ *-----------------------------*/
+#ifndef USE_ST7565
+#  define USE_ST7565          0
+#endif
+
+#if USE_ST7565
+/*No settings*/
+#endif  /*USE_ST7565*/
+
+/*-----------------------------------------
+ *  Linux frame buffer device (/dev/fbx)
+ *-----------------------------------------*/
+#ifndef USE_FBDEV
+#  define USE_FBDEV           1
+#endif
+
+#if USE_FBDEV
+#  define FBDEV_PATH          "/dev/fb0"
+#endif
+
+/*********************
+ *  INPUT DEVICES
+ *********************/
+
+/*--------------
+ *    XPT2046
+ *--------------*/
+#ifndef USE_XPT2046
+#  define USE_XPT2046         0
+#endif
+
+#if USE_XPT2046
+#  define XPT2046_HOR_RES     480
+#  define XPT2046_VER_RES     320
+#  define XPT2046_X_MIN       200
+#  define XPT2046_Y_MIN       200
+#  define XPT2046_X_MAX       3800
+#  define XPT2046_Y_MAX       3800
+#  define XPT2046_AVG         4
+#  define XPT2046_INV         0
+#endif
+
+/*-----------------
+ *    FT5406EE8
+ *-----------------*/
+#ifndef USE_FT5406EE8
+#  define USE_FT5406EE8       0
+#endif
+
+#if USE_FT5406EE8
+# define FT5406EE8_I2C_ADR   0x38                  /*7 bit address*/
+#endif
+
+/*---------------
+ *  AD TOUCH
+ *--------------*/
+#ifndef USE_AD_TOUCH
+#  define USE_AD_TOUCH        0
+#endif
+
+#if USE_AD_TOUCH
+/*No settings*/
+#endif
+
+
+/*---------------------------------------
+ * Mouse or touchpad on PC (using SDL)
+ *-------------------------------------*/
+#ifndef USE_MOUSE
+#  define USE_MOUSE           1
+#endif
+
+#if USE_MOUSE
+/*No settings*/
+#endif
+
+/*-------------------------------------------
+ * Mousewheel as encoder on PC (using SDL)
+ *------------------------------------------*/
+#ifndef USE_MOUSEWHEEL
+#  define USE_MOUSEWHEEL      1
+#endif
+
+#if USE_MOUSEWHEEL
+/*No settings*/
+#endif
+
+/*-------------------------------------------------
+ * Touchscreen as libinput interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_LIBINPUT
+#  define USE_LIBINPUT           0
+#endif
+
+#if USE_LIBINPUT
+#  define LIBINPUT_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#endif  /*USE_LIBINPUT*/
+
+/*-------------------------------------------------
+ * Mouse or touchpad as evdev interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_EVDEV
+#  define USE_EVDEV           0
+#endif
+
+#if USE_EVDEV
+#  define EVDEV_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#  define EVDEV_SWAP_AXES         0               /*Swap the x and y axes of the touchscreen*/
+
+#  define EVDEV_SCALE             0               /* Scale input, e.g. if touchscreen resolution does not match display resolution */
+#  if EVDEV_SCALE
+#    define EVDEV_SCALE_HOR_RES     (4096)          /* Horizontal resolution of touchscreen */
+#    define EVDEV_SCALE_VER_RES     (4096)          /* Vertical resolution of touchscreen */
+#  endif  /*EVDEV_SCALE*/
+
+#  define EVDEV_CALIBRATE         0               /*Scale and offset the touchscreen coordinates by using maximum and minimum values for each axis*/
+#  if EVDEV_CALIBRATE
+#    define EVDEV_HOR_MIN   3800                    /*If EVDEV_XXX_MIN > EVDEV_XXX_MAX the XXX axis is automatically inverted*/
+#    define EVDEV_HOR_MAX   200
+#    define EVDEV_VER_MIN   200
+#    define EVDEV_VER_MAX   3800
+#  endif  /*EVDEV_SCALE*/
+#endif  /*USE_EVDEV*/
+
+/*-------------------------------
+ *   Keyboard of a PC (using SDL)
+ *------------------------------*/
+#ifndef USE_KEYBOARD
+#  define USE_KEYBOARD        1
+#endif
+
+#if USE_KEYBOARD
+/*No settings*/
+#endif
+
+#endif  /*LV_DRV_CONF_H*/
+
+#endif /*End of "Content enable"*/

samples/gui/wasm-runtime-wgl/src/platform/linux/main.c

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+extern void iwasm_main(int argc, char *argv[]);
+int main(int argc, char *argv[])
+{
+    iwasm_main(argc,argv);
+}

samples/gui/wasm-runtime-wgl/src/platform/zephyr/LICENSE

@@ -0,0 +1,202 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
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+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+

samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.c

@@ -0,0 +1,337 @@
+/**
+ * @file XPT2046.c
+*/
+/*********************
+ *      INCLUDES
+ *********************/
+#include "XPT2046.h"
+#include "board_config.h"
+#include "stdio.h"
+#include <string.h>
+#include "spi.h"
+
+#include "zephyr.h"
+#include "kernel.h"
+
+#if USE_XPT2046
+
+#include <stddef.h>
+
+#define abs(x) ((x) < 0 ? -(x) : (x))
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ *  STATIC PROTOTYPES
+ **********************/
+static void xpt2046_corr(int16_t * x, int16_t * y);
+static void xpt2046_avg(int16_t * x, int16_t * y);
+
+/**********************
+ *  STATIC VARIABLES
+ **********************/
+int16_t avg_buf_x[XPT2046_AVG];
+int16_t avg_buf_y[XPT2046_AVG];
+uint8_t avg_last;
+
+/**********************
+ *      MACROS
+ **********************/
+
+/**********************
+ *   GLOBAL FUNCTIONS
+ **********************/
+
+/**
+ * Initialize the XPT2046
+ */
+struct device *input_dev;
+
+struct spi_config spi_conf_xpt2046;
+struct spi_cs_control xpt2046_cs_ctrl;
+struct device *xpt2046_pen_gpio_dev;
+static struct gpio_callback gpio_cb;
+lv_indev_data_t touch_point;
+lv_indev_data_t last_touch_point;
+
+#define TOUCH_READ_THREAD_STACK_SIZE 4096
+static K_THREAD_STACK_DEFINE(touch_read_thread_stack, TOUCH_READ_THREAD_STACK_SIZE);
+static struct k_thread touch_thread_data;
+static struct k_sem sem_touch_read;
+
+K_MUTEX_DEFINE( spi_display_touch_mutex);
+
+int cnt = 0;
+int touch_read_times = 0;
+int last_pen_interrupt_time = 0;
+void xpt2046_pen_gpio_callback(struct device *port, struct gpio_callback *cb,
+        u32_t pins)
+{
+    int i;
+    cnt++;
+    if ((k_uptime_get_32() - last_pen_interrupt_time) > 500) {
+        k_sem_give(&sem_touch_read);
+        touch_read_times++;
+        last_pen_interrupt_time = k_uptime_get_32();
+    }
+
+}
+
+void disable_pen_interrupt()
+{
+    int ret = 0;
+    ret = gpio_pin_disable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    if (ret != 0) {
+        printf("gpio_pin_configure GPIO_DIR_IN failed\n");
+    }
+}
+void enable_pen_interrupt()
+{
+    int ret = 0;
+    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    if (ret != 0) {
+        printf("gpio_pin_configure failed\n");
+    }
+}
+
+void touch_screen_read_thread()
+{
+    int i;
+    bool ret = false;
+
+    for (;;) {
+        k_sem_take(&sem_touch_read, K_FOREVER);
+        memset(&last_touch_point, 0, sizeof(lv_indev_data_t));
+        memset(&touch_point, 0, sizeof(lv_indev_data_t));
+        memset(avg_buf_x, 0, sizeof(avg_buf_x));
+        memset(avg_buf_y, 0, sizeof(avg_buf_y));
+        k_mutex_lock(&spi_display_touch_mutex, K_FOREVER);
+        disable_pen_interrupt();
+        for (i = 0; i < 100; i++) {
+            ret = xpt2046_read(&touch_point);
+            if (ret) {
+                if ((abs(last_touch_point.point.x - touch_point.point.x) < 4)
+                        && (abs(last_touch_point.point.y - touch_point.point.y)
+                                < 4)) {
+                    break;
+                }
+                last_touch_point = touch_point;
+
+            }
+        }
+        enable_pen_interrupt();
+        k_mutex_unlock(&spi_display_touch_mutex);
+    }
+}
+
+void xpt2046_init(void)
+{
+    int ret;
+    input_dev = device_get_binding(XPT2046_SPI_DEVICE_NAME);
+
+    if (input_dev == NULL) {
+        printf("device not found.  Aborting test.");
+        return;
+    }
+    memset((void *) &touch_point, 0, sizeof(lv_indev_data_t));
+
+    spi_conf_xpt2046.frequency = XPT2046_SPI_MAX_FREQUENCY;
+    spi_conf_xpt2046.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8);
+    spi_conf_xpt2046.slave = 0;
+    spi_conf_xpt2046.cs = NULL;
+#ifdef XPT2046_CS_GPIO_CONTROLLER
+    xpt2046_cs_ctrl.gpio_dev = device_get_binding(XPT2046_CS_GPIO_CONTROLLER);
+    if (xpt2046_cs_ctrl.gpio_dev == NULL) {
+        printk("Cannot find %s!\n", XPT2046_CS_GPIO_CONTROLLER);
+        return;
+    }
+    gpio_pin_configure(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN,
+                       GPIO_DIR_OUT);
+    gpio_pin_write(xpt2046_cs_ctrl.gpio_dev, XPT2046_CS_GPIO_PIN, 1);
+    xpt2046_cs_ctrl.gpio_pin = XPT2046_CS_GPIO_PIN;
+    xpt2046_cs_ctrl.delay = 0;
+    spi_conf_xpt2046.cs = &xpt2046_cs_ctrl;
+
+#endif
+
+#ifdef XPT2046_PEN_GPIO_CONTROLLER
+
+    xpt2046_pen_gpio_dev = device_get_binding(XPT2046_PEN_GPIO_CONTROLLER);
+    if (!xpt2046_pen_gpio_dev) {
+        printk("Cannot find %s!\n", XPT2046_PEN_GPIO_CONTROLLER);
+        return;
+    }
+    /* Setup GPIO input */
+    ret = gpio_pin_configure(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN,
+                             (GPIO_DIR_IN | GPIO_INT | GPIO_INT_EDGE
+                              | GPIO_INT_ACTIVE_LOW | GPIO_INT_DEBOUNCE)
+                            );
+    if (ret) {
+        printk("Error configuring pin %d!\n", XPT2046_PEN_GPIO_PIN);
+    }
+
+    gpio_init_callback(&gpio_cb, xpt2046_pen_gpio_callback,
+                       BIT(XPT2046_PEN_GPIO_PIN));
+
+    ret = gpio_add_callback(xpt2046_pen_gpio_dev, &gpio_cb);
+    if (ret) {
+        printk("gpio_add_callback error\n");
+    }
+    ret = gpio_pin_enable_callback(xpt2046_pen_gpio_dev, XPT2046_PEN_GPIO_PIN);
+    if (ret) {
+        printk("gpio_pin_enable_callback error\n");
+    }
+#endif
+
+    k_sem_init(&sem_touch_read, 0, 1);
+
+    k_thread_create(&touch_thread_data, touch_read_thread_stack,
+                    TOUCH_READ_THREAD_STACK_SIZE, touch_screen_read_thread,
+                    NULL, NULL, NULL, 5,
+                    0, K_NO_WAIT);
+    printf("xpt2046_init ok \n");
+}
+
+/**
+ * Get the current position and state of the touchpad
+ * @param data store the read data here
+ * @return false: because no ore data to be read
+ */
+bool xpt2046_read(lv_indev_data_t * data)
+{
+    static int16_t last_x = 0;
+    static int16_t last_y = 0;
+    bool valid = true;
+    int s32_ret = 0;
+    uint8_t buf;
+
+    int16_t x = 0;
+    int16_t y = 0;
+
+    char tx1[16] = { 0 };
+    char rx1[16] = { 0 };
+
+    struct spi_buf tx_buf = { .buf = &tx1, .len = 3 };
+    struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };
+    struct spi_buf rx_buf = { .buf = &rx1, .len = 3 };
+    struct spi_buf_set rx_bufs = { .buffers = &rx_buf, .count = 1 };
+
+    tx1[0] = CMD_X_READ;
+    s32_ret = spi_transceive(input_dev, &spi_conf_xpt2046, &tx_bufs, &rx_bufs);
+    if (s32_ret != 0) {
+        printf("spi_transceive return failed:%d\n", s32_ret);
+    }
+    x = rx1[1] << 8;
+    x += rx1[2];
+
+    tx1[0] = CMD_Y_READ;
+    s32_ret = spi_transceive(input_dev, &spi_conf_xpt2046, &tx_bufs, &rx_bufs);
+    if (s32_ret != 0) {
+        printf("spi_transceive return failed:%d\n", s32_ret);
+    }
+    y = rx1[1] << 8;
+    y += rx1[2];
+    x = x >> 3;
+    y = y >> 3;
+
+    xpt2046_corr(&x, &y);
+    if (y <= 0 || (x > 320)) {
+        valid = false;
+    }
+
+    last_x = x;
+    last_y = y;
+
+    data->point.x = x;
+    data->point.y = y;
+    data->state = valid == false ? LV_INDEV_STATE_REL : LV_INDEV_STATE_PR;
+
+    return valid;
+}
+
+/**********************
+ *   STATIC FUNCTIONS
+ **********************/
+static void xpt2046_corr(int16_t * x, int16_t * y)
+{
+#if XPT2046_XY_SWAP != 0
+    int16_t swap_tmp;
+    swap_tmp = *x;
+    *x = *y;
+    *y = swap_tmp;
+#endif
+
+    if ((*x) > XPT2046_X_MIN)
+        (*x) -= XPT2046_X_MIN;
+    else
+        (*x) = 0;
+
+    if ((*y) > XPT2046_Y_MIN)
+        (*y) -= XPT2046_Y_MIN;
+    else
+        (*y) = 0;
+
+    (*x) = (uint32_t)((uint32_t)(*x) * XPT2046_HOR_RES)
+            / (XPT2046_X_MAX - XPT2046_X_MIN);
+
+    (*y) = (uint32_t)((uint32_t)(*y) * XPT2046_VER_RES)
+            / (XPT2046_Y_MAX - XPT2046_Y_MIN);
+
+#if XPT2046_X_INV != 0
+    (*x) = XPT2046_HOR_RES - (*x);
+#endif
+
+#if XPT2046_Y_INV != 0
+    (*y) = XPT2046_VER_RES - (*y);
+#endif
+
+}
+
+static void xpt2046_avg(int16_t * x, int16_t * y)
+{
+    /*Shift out the oldest data*/
+    uint8_t i;
+    for (i = XPT2046_AVG - 1; i > 0; i--) {
+        avg_buf_x[i] = avg_buf_x[i - 1];
+        avg_buf_y[i] = avg_buf_y[i - 1];
+    }
+
+    /*Insert the new point*/
+    avg_buf_x[0] = *x;
+    avg_buf_y[0] = *y;
+    if (avg_last < XPT2046_AVG)
+        avg_last++;
+
+    /*Sum the x and y coordinates*/
+    int32_t x_sum = 0;
+    int32_t y_sum = 0;
+    for (i = 0; i < avg_last; i++) {
+        x_sum += avg_buf_x[i];
+        y_sum += avg_buf_y[i];
+    }
+
+    /*Normalize the sums*/
+    (*x) = (int32_t) x_sum / avg_last;
+    (*y) = (int32_t) y_sum / avg_last;
+}
+
+bool touchscreen_read(lv_indev_data_t * data)
+{
+    /*Store the collected data*/
+    data->point.x = last_touch_point.point.x;
+    data->point.y = last_touch_point.point.y;
+    data->state = last_touch_point.state;
+
+    if (last_touch_point.state == LV_INDEV_STATE_PR) {
+        last_touch_point.state = LV_INDEV_STATE_REL;
+    }
+    return false;
+}
+
+#endif

samples/gui/wasm-runtime-wgl/src/platform/zephyr/XPT2046.h

@@ -0,0 +1,71 @@
+/**
+ * @file XPT2046.h
+ *
+ */
+
+#ifndef XPT2046_H
+#define XPT2046_H
+
+#define USE_XPT2046 1
+#ifndef LV_CONF_INCLUDE_SIMPLE
+#define LV_CONF_INCLUDE_SIMPLE
+#endif
+
+#  define XPT2046_HOR_RES     320
+#  define XPT2046_VER_RES     240
+#  define XPT2046_X_MIN       200
+#  define XPT2046_Y_MIN       200
+#  define XPT2046_X_MAX       3800
+#  define XPT2046_Y_MAX       3800
+#  define XPT2046_AVG         4
+#  define XPT2046_INV         0
+
+#define CMD_X_READ  0b10010000
+#define CMD_Y_READ  0b11010000
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*********************
+ *      INCLUDES
+ *********************/
+#ifdef LV_CONF_INCLUDE_SIMPLE
+//#include "lv_drv_conf.h"
+#else
+//#include "../../lv_drv_conf.h"
+#endif
+
+#if USE_XPT2046
+#include <autoconf.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include "lv_hal/lv_hal_indev.h"
+#include "device.h"
+#include "gpio.h"
+
+/*********************
+ *      DEFINES
+ *********************/
+
+/**********************
+ *      TYPEDEFS
+ **********************/
+
+/**********************
+ * GLOBAL PROTOTYPES
+ **********************/
+void xpt2046_init(void);
+bool xpt2046_read(lv_indev_data_t * data);
+
+/**********************
+ *      MACROS
+ **********************/
+
+#endif /* USE_XPT2046 */
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* XPT2046_H */

samples/gui/wasm-runtime-wgl/src/platform/zephyr/board_config.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef __BOARD_CONFIG_H__
+#define __BOARD_CONFIG_H__
+#include "pin_config_stm32.h"
+
+#endif /* __BOARD_CONFIG_H__ */

samples/gui/wasm-runtime-wgl/src/platform/zephyr/display.h

@@ -0,0 +1,405 @@
+/*
+ * Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief Public API for display drivers and applications
+ */
+
+#ifndef ZEPHYR_INCLUDE_DISPLAY_H_
+#define ZEPHYR_INCLUDE_DISPLAY_H_
+
+/**
+ * @brief Display Interface
+ * @defgroup display_interface Display Interface
+ * @ingroup display_interfaces
+ * @{
+ */
+
+#include <device.h>
+#include <stddef.h>
+#include <zephyr/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum display_pixel_format {
+    PIXEL_FORMAT_RGB_888 = BIT(0), PIXEL_FORMAT_MONO01 = BIT(1), /* 0=Black 1=White */
+    PIXEL_FORMAT_MONO10 = BIT(2), /* 1=Black 0=White */
+    PIXEL_FORMAT_ARGB_8888 = BIT(3), PIXEL_FORMAT_RGB_565 = BIT(4),
+};
+
+enum display_screen_info {
+    /**
+     * If selected, one octet represents 8 pixels ordered vertically,
+     * otherwise ordered horizontally.
+     */
+    SCREEN_INFO_MONO_VTILED = BIT(0),
+    /**
+     * If selected, the MSB represents the first pixel,
+     * otherwise MSB represents the last pixel.
+     */
+    SCREEN_INFO_MONO_MSB_FIRST = BIT(1),
+    /**
+     * Electrophoretic Display.
+     */
+    SCREEN_INFO_EPD = BIT(2),
+    /**
+     * Screen has two alternating ram buffers
+     */
+    SCREEN_INFO_DOUBLE_BUFFER = BIT(3),
+};
+
+/**
+ * @enum display_orientation
+ * @brief Enumeration with possible display orientation
+ *
+ */
+enum display_orientation {
+    DISPLAY_ORIENTATION_NORMAL,
+    DISPLAY_ORIENTATION_ROTATED_90,
+    DISPLAY_ORIENTATION_ROTATED_180,
+    DISPLAY_ORIENTATION_ROTATED_270,
+};
+
+/**
+ * @struct display_capabilities
+ * @brief Structure holding display capabilities
+ *
+ * @var u16_t display_capabilities::x_resolution
+ * Display resolution in the X direction
+ *
+ * @var u16_t display_capabilities::y_resolution
+ * Display resolution in the Y direction
+ *
+ * @var u32_t display_capabilities::supported_pixel_formats
+ * Bitwise or of pixel formats supported by the display
+ *
+ * @var u32_t display_capabilities::screen_info
+ * Information about display panel
+ *
+ * @var enum display_pixel_format display_capabilities::current_pixel_format
+ * Currently active pixel format for the display
+ *
+ * @var enum display_orientation display_capabilities::current_orientation
+ * Current display orientation
+ *
+ */
+struct display_capabilities {
+    u16_t x_resolution;
+    u16_t y_resolution;
+    u32_t supported_pixel_formats;
+    u32_t screen_info;
+    enum display_pixel_format current_pixel_format;
+    enum display_orientation current_orientation;
+};
+
+/**
+ * @struct display_buffer_descriptor
+ * @brief Structure to describe display data buffer layout
+ *
+ * @var u32_t display_buffer_descriptor::buf_size
+ * Data buffer size in bytes
+ *
+ * @var u16_t display_buffer_descriptor::width
+ * Data buffer row width in pixels
+ *
+ * @var u16_t display_buffer_descriptor::height
+ * Data buffer column height in pixels
+ *
+ * @var u16_t display_buffer_descriptor::pitch
+ * Number of pixels between consecutive rows in the data buffer
+ *
+ */
+struct display_buffer_descriptor {
+    u32_t buf_size;
+    u16_t width;
+    u16_t height;
+    u16_t pitch;
+};
+
+/**
+ * @typedef display_blanking_on_api
+ * @brief Callback API to turn on display blanking
+ * See display_blanking_on() for argument description
+ */
+typedef int (*display_blanking_on_api)(const struct device *dev);
+
+/**
+ * @typedef display_blanking_off_api
+ * @brief Callback API to turn off display blanking
+ * See display_blanking_off() for argument description
+ */
+typedef int (*display_blanking_off_api)(const struct device *dev);
+
+/**
+ * @typedef display_write_api
+ * @brief Callback API for writing data to the display
+ * See display_write() for argument description
+ */
+typedef int (*display_write_api)(const struct device *dev, const u16_t x,
+        const u16_t y, const struct display_buffer_descriptor *desc,
+        const void *buf);
+
+/**
+ * @typedef display_read_api
+ * @brief Callback API for reading data from the display
+ * See display_read() for argument description
+ */
+typedef int (*display_read_api)(const struct device *dev, const u16_t x,
+        const u16_t y, const struct display_buffer_descriptor *desc, void *buf);
+
+/**
+ * @typedef display_get_framebuffer_api
+ * @brief Callback API to get framebuffer pointer
+ * See display_get_framebuffer() for argument description
+ */
+typedef void *(*display_get_framebuffer_api)(const struct device *dev);
+
+/**
+ * @typedef display_set_brightness_api
+ * @brief Callback API to set display brightness
+ * See display_set_brightness() for argument description
+ */
+typedef int (*display_set_brightness_api)(const struct device *dev,
+        const u8_t brightness);
+
+/**
+ * @typedef display_set_contrast_api
+ * @brief Callback API to set display contrast
+ * See display_set_contrast() for argument description
+ */
+typedef int (*display_set_contrast_api)(const struct device *dev,
+        const u8_t contrast);
+
+/**
+ * @typedef display_get_capabilities_api
+ * @brief Callback API to get display capabilities
+ * See display_get_capabilities() for argument description
+ */
+typedef void (*display_get_capabilities_api)(const struct device *dev,
+        struct display_capabilities * capabilities);
+
+/**
+ * @typedef display_set_pixel_format_api
+ * @brief Callback API to set pixel format used by the display
+ * See display_set_pixel_format() for argument description
+ */
+typedef int (*display_set_pixel_format_api)(const struct device *dev,
+        const enum display_pixel_format pixel_format);
+
+/**
+ * @typedef display_set_orientation_api
+ * @brief Callback API to set orientation used by the display
+ * See display_set_orientation() for argument description
+ */
+typedef int (*display_set_orientation_api)(const struct device *dev,
+        const enum display_orientation orientation);
+
+/**
+ * @brief Display driver API
+ * API which a display driver should expose
+ */
+struct display_driver_api {
+    display_blanking_on_api blanking_on;
+    display_blanking_off_api blanking_off;
+    display_write_api write;
+    display_read_api read;
+    display_get_framebuffer_api get_framebuffer;
+    display_set_brightness_api set_brightness;
+    display_set_contrast_api set_contrast;
+    display_get_capabilities_api get_capabilities;
+    display_set_pixel_format_api set_pixel_format;
+    display_set_orientation_api set_orientation;
+};
+extern struct ili9340_data ili9340_data1;
+extern struct display_driver_api ili9340_api1;
+/**
+ * @brief Write data to display
+ *
+ * @param dev Pointer to device structure
+ * @param x x Coordinate of the upper left corner where to write the buffer
+ * @param y y Coordinate of the upper left corner where to write the buffer
+ * @param desc Pointer to a structure describing the buffer layout
+ * @param buf Pointer to buffer array
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_write(const struct device *dev, const u16_t x,
+        const u16_t y, const struct display_buffer_descriptor *desc,
+        const void *buf)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->write(dev, x, y, desc, buf);
+}
+
+/**
+ * @brief Read data from display
+ *
+ * @param dev Pointer to device structure
+ * @param x x Coordinate of the upper left corner where to read from
+ * @param y y Coordinate of the upper left corner where to read from
+ * @param desc Pointer to a structure describing the buffer layout
+ * @param buf Pointer to buffer array
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_read(const struct device *dev, const u16_t x,
+        const u16_t y, const struct display_buffer_descriptor *desc, void *buf)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->read(dev, x, y, desc, buf);
+}
+
+/**
+ * @brief Get pointer to framebuffer for direct access
+ *
+ * @param dev Pointer to device structure
+ *
+ * @retval Pointer to frame buffer or NULL if direct framebuffer access
+ * is not supported
+ *
+ */
+static inline void *display_get_framebuffer(const struct device *dev)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->get_framebuffer(dev);
+}
+
+/**
+ * @brief Turn display blanking on
+ *
+ * @param dev Pointer to device structure
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_blanking_on(const struct device *dev)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->blanking_on(dev);
+}
+
+/**
+ * @brief Turn display blanking off
+ *
+ * @param dev Pointer to device structure
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_blanking_off(const struct device *dev)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->blanking_off(dev);
+}
+
+/**
+ * @brief Set the brightness of the display
+ *
+ * Set the brightness of the display in steps of 1/256, where 255 is full
+ * brightness and 0 is minimal.
+ *
+ * @param dev Pointer to device structure
+ * @param brightness Brightness in steps of 1/256
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_set_brightness(const struct device *dev,
+        u8_t brightness)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->set_brightness(dev, brightness);
+}
+
+/**
+ * @brief Set the contrast of the display
+ *
+ * Set the contrast of the display in steps of 1/256, where 255 is maximum
+ * difference and 0 is minimal.
+ *
+ * @param dev Pointer to device structure
+ * @param contrast Contrast in steps of 1/256
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_set_contrast(const struct device *dev, u8_t contrast)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->set_contrast(dev, contrast);
+}
+
+/**
+ * @brief Get display capabilities
+ *
+ * @param dev Pointer to device structure
+ * @param capabilities Pointer to capabilities structure to populate
+ */
+static inline void display_get_capabilities(const struct device *dev,
+        struct display_capabilities * capabilities)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    api->get_capabilities(dev, capabilities);
+}
+
+/**
+ * @brief Set pixel format used by the display
+ *
+ * @param dev Pointer to device structure
+ * @param pixel_format Pixel format to be used by display
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_set_pixel_format(const struct device *dev,
+        const enum display_pixel_format pixel_format)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->set_pixel_format(dev, pixel_format);
+}
+
+/**
+ * @brief Set display orientation
+ *
+ * @param dev Pointer to device structure
+ * @param orientation Orientation to be used by display
+ *
+ * @retval 0 on success else negative errno code.
+ */
+static inline int display_set_orientation(const struct device *dev,
+        const enum display_orientation orientation)
+{
+    struct display_driver_api *api = &ili9340_api1;
+    //(struct display_driver_api *)dev->driver_api;
+
+    return api->set_orientation(dev, orientation);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+/**
+ * @}
+ */
+
+#endif /* ZEPHYR_INCLUDE_DISPLAY_H_*/

samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.c

@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "display_ili9340.h"
+#include <display.h>
+
+//#define LOG_LEVEL CONFIG_DISPLAY_LOG_LEVEL
+//#include <logging/log.h>
+//LOG_MODULE_REGISTER(display_ili9340);
+#define LOG_ERR printf
+#define LOG_DBG printf
+#define LOG_WRN printf
+
+#include <gpio.h>
+#include <misc/byteorder.h>
+#include <spi.h>
+#include <string.h>
+
+struct ili9340_data {
+    struct device *reset_gpio;
+    struct device *command_data_gpio;
+    struct device *spi_dev;
+    struct spi_config spi_config;
+#ifdef DT_ILITEK_ILI9340_0_CS_GPIO_CONTROLLER
+struct spi_cs_control cs_ctrl;
+#endif
+};
+
+struct ili9340_data ili9340_data1;
+
+#define ILI9340_CMD_DATA_PIN_COMMAND 0
+#define ILI9340_CMD_DATA_PIN_DATA 1
+
+static void ili9340_exit_sleep(struct ili9340_data *data)
+{
+    ili9340_transmit(data, ILI9340_CMD_EXIT_SLEEP, NULL, 0);
+    //k_sleep(120);
+}
+
+int ili9340_init()
+{
+    struct ili9340_data *data = &ili9340_data1;
+    printf("Initializing display driver\n");
+    data->spi_dev = device_get_binding(DT_ILITEK_ILI9340_0_BUS_NAME);
+    if (data->spi_dev == NULL) {
+        return -EPERM;
+    }
+    data->spi_config.frequency = DT_ILITEK_ILI9340_0_SPI_MAX_FREQUENCY;
+    data->spi_config.operation = SPI_OP_MODE_MASTER | SPI_WORD_SET(8); //SPI_OP_MODE_MASTER | SPI_WORD_SET(8);
+    data->spi_config.slave = DT_ILITEK_ILI9340_0_BASE_ADDRESS;
+
+#ifdef DT_ILITEK_ILI9340_0_CS_GPIO_CONTROLLER
+    data->cs_ctrl.gpio_dev =
+    device_get_binding(DT_ILITEK_ILI9340_0_CS_GPIO_CONTROLLER);
+    data->cs_ctrl.gpio_pin = DT_ILITEK_ILI9340_0_CS_GPIO_PIN;
+    data->cs_ctrl.delay = 0;
+    data->spi_config.cs = &(data->cs_ctrl);
+#else
+    data->spi_config.cs = NULL;
+#endif
+    data->reset_gpio = device_get_binding(
+        DT_ILITEK_ILI9340_0_RESET_GPIOS_CONTROLLER);
+    if (data->reset_gpio == NULL) {
+        return -EPERM;
+    }
+
+    gpio_pin_configure(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN,
+        GPIO_DIR_OUT);
+
+    data->command_data_gpio = device_get_binding(
+        DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER);
+    if (data->command_data_gpio == NULL) {    
+        return -EPERM;
+    }
+
+    gpio_pin_configure(data->command_data_gpio,
+        DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN, GPIO_DIR_OUT);
+
+    LOG_DBG("Resetting display driver");
+    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    k_sleep(1);
+    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 0);
+    k_sleep(1);
+    gpio_pin_write(data->reset_gpio, DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN, 1);
+    k_sleep(5);
+
+    LOG_DBG("Initializing LCD\n");
+    ili9340_lcd_init(data);
+
+    LOG_DBG("Exiting sleep mode\n");
+    ili9340_exit_sleep(data);
+
+    return 0;
+}
+
+static void ili9340_set_mem_area(struct ili9340_data *data, const u16_t x,
+    const u16_t y, const u16_t w, const u16_t h)
+{
+    u16_t spi_data[2];
+
+    spi_data[0] = sys_cpu_to_be16(x);
+    spi_data[1] = sys_cpu_to_be16(x + w - 1);
+    ili9340_transmit(data, ILI9340_CMD_COLUMN_ADDR, &spi_data[0], 4);
+
+    spi_data[0] = sys_cpu_to_be16(y);
+    spi_data[1] = sys_cpu_to_be16(y + h - 1);
+    ili9340_transmit(data, ILI9340_CMD_PAGE_ADDR, &spi_data[0], 4);
+}
+
+static int ili9340_write(const struct device *dev, const u16_t x, const u16_t y,
+    const struct display_buffer_descriptor *desc, const void *buf)
+{
+    struct ili9340_data *data = (struct ili9340_data *) &ili9340_data1;
+    const u8_t *write_data_start = (u8_t *) buf;
+    struct spi_buf tx_buf;
+    struct spi_buf_set tx_bufs;
+    u16_t write_cnt;
+    u16_t nbr_of_writes;
+    u16_t write_h;
+
+    __ASSERT(desc->width <= desc->pitch, "Pitch is smaller then width");
+    __ASSERT((3 * desc->pitch * desc->height) <= desc->buf_size,
+        "Input buffer to small");
+    ili9340_set_mem_area(data, x, y, desc->width, desc->height);
+
+    if (desc->pitch > desc->width) {
+        write_h = 1U;
+        nbr_of_writes = desc->height;
+    } else {
+        write_h = desc->height;
+        nbr_of_writes = 1U;
+    }
+    ili9340_transmit(data, ILI9340_CMD_MEM_WRITE, (void *) write_data_start,
+        3 * desc->width * write_h);
+
+    tx_bufs.buffers = &tx_buf;
+    tx_bufs.count = 1;
+
+    write_data_start += (3 * desc->pitch);
+    for (write_cnt = 1U; write_cnt < nbr_of_writes; ++write_cnt) {
+        tx_buf.buf = (void *) write_data_start;
+        tx_buf.len = 3 * desc->width * write_h;
+        spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
+        write_data_start += (3 * desc->pitch);
+    }
+
+    return 0;
+}
+
+static int ili9340_read(const struct device *dev, const u16_t x, const u16_t y,
+    const struct display_buffer_descriptor *desc, void *buf)
+{
+    LOG_ERR("Reading not supported");
+    return -ENOTSUP;
+}
+
+static void *ili9340_get_framebuffer(const struct device *dev)
+{
+    LOG_ERR("Direct framebuffer access not supported");
+    return NULL;
+}
+
+static int ili9340_display_blanking_off(const struct device *dev)
+{
+    struct ili9340_data *data = (struct ili9340_data *) dev->driver_data;
+
+    LOG_DBG("Turning display blanking off");
+    ili9340_transmit(data, ILI9340_CMD_DISPLAY_ON, NULL, 0);
+    return 0;
+}
+
+static int ili9340_display_blanking_on(const struct device *dev)
+{
+    struct ili9340_data *data = (struct ili9340_data *) dev->driver_data;
+
+    LOG_DBG("Turning display blanking on");
+    ili9340_transmit(data, ILI9340_CMD_DISPLAY_OFF, NULL, 0);
+    return 0;
+}
+
+static int ili9340_set_brightness(const struct device *dev,
+    const u8_t brightness)
+{
+    LOG_WRN("Set brightness not implemented");
+    return -ENOTSUP;
+}
+
+static int ili9340_set_contrast(const struct device *dev, const u8_t contrast)
+{
+    LOG_ERR("Set contrast not supported");
+    return -ENOTSUP;
+}
+
+static int ili9340_set_pixel_format(const struct device *dev,
+    const enum display_pixel_format pixel_format)
+{
+    if (pixel_format == PIXEL_FORMAT_RGB_888) {
+    return 0;
+}
+    LOG_ERR("Pixel format change not implemented");
+    return -ENOTSUP;
+}
+
+static int ili9340_set_orientation(const struct device *dev,
+    const enum display_orientation orientation)
+{
+if (orientation == DISPLAY_ORIENTATION_NORMAL) {
+    return 0;
+}
+LOG_ERR("Changing display orientation not implemented");
+    return -ENOTSUP;
+}
+
+static void ili9340_get_capabilities(const struct device *dev,
+    struct display_capabilities *capabilities)
+{
+    memset(capabilities, 0, sizeof(struct display_capabilities));
+    capabilities->x_resolution = 320;
+    capabilities->y_resolution = 240;
+    capabilities->supported_pixel_formats = PIXEL_FORMAT_RGB_888;
+    capabilities->current_pixel_format = PIXEL_FORMAT_RGB_888;
+    capabilities->current_orientation = DISPLAY_ORIENTATION_NORMAL;
+}
+
+void ili9340_transmit(struct ili9340_data *data, u8_t cmd, void *tx_data,
+    size_t tx_len)
+{
+    int i;
+    char * buf1 = tx_data;
+    data = (struct ili9340_data *) &ili9340_data1;
+    struct spi_buf tx_buf = { .buf = &cmd, .len = 1 };
+    struct spi_buf_set tx_bufs = { .buffers = &tx_buf, .count = 1 };
+
+    gpio_pin_write(data->command_data_gpio, DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
+        ILI9340_CMD_DATA_PIN_COMMAND);
+    spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
+    if (tx_data != NULL) {
+        tx_buf.buf = tx_data;
+        tx_buf.len = tx_len;
+        gpio_pin_write(data->command_data_gpio,
+        DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN,
+        ILI9340_CMD_DATA_PIN_DATA);
+        spi_transceive(data->spi_dev, &data->spi_config, &tx_bufs, NULL);
+    }
+}
+
+struct display_driver_api ili9340_api1 =
+    { .blanking_on = ili9340_display_blanking_on, .blanking_off =
+            ili9340_display_blanking_off, .write = ili9340_write, .read =
+            ili9340_read, .get_framebuffer = ili9340_get_framebuffer,
+            .set_brightness = ili9340_set_brightness, .set_contrast =
+                    ili9340_set_contrast, .get_capabilities =
+                    ili9340_get_capabilities, .set_pixel_format =
+                    ili9340_set_pixel_format, .set_orientation =
+                    ili9340_set_orientation, };
+
+/*
+ DEVICE_AND_API_INIT(ili9340, DT_ILITEK_ILI9340_0_LABEL, &ili9340_init,
+ &ili9340_data, NULL, APPLICATION,
+ CONFIG_APPLICATION_INIT_PRIORITY, &ili9340_api);
+ */

samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340.h

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef ZEPHYR_DRIVERS_DISPLAY_DISPLAY_ILI9340_H_
+#define ZEPHYR_DRIVERS_DISPLAY_DISPLAY_ILI9340_H_
+#include "board_config.h"
+#include <autoconf.h>
+#include <zephyr.h>
+
+#define ILI9340_CMD_ENTER_SLEEP 0x10
+#define ILI9340_CMD_EXIT_SLEEP 0x11
+#define ILI9340_CMD_GAMMA_SET 0x26
+#define ILI9340_CMD_DISPLAY_OFF 0x28
+#define ILI9340_CMD_DISPLAY_ON 0x29
+#define ILI9340_CMD_COLUMN_ADDR 0x2a
+#define ILI9340_CMD_PAGE_ADDR 0x2b
+#define ILI9340_CMD_MEM_WRITE 0x2c
+#define ILI9340_CMD_MEM_ACCESS_CTRL 0x36
+#define ILI9340_CMD_PIXEL_FORMAT_SET 0x3A
+#define ILI9340_CMD_FRAME_CTRL_NORMAL_MODE 0xB1
+#define ILI9340_CMD_DISPLAY_FUNCTION_CTRL 0xB6
+#define ILI9340_CMD_POWER_CTRL_1 0xC0
+#define ILI9340_CMD_POWER_CTRL_2 0xC1
+#define ILI9340_CMD_VCOM_CTRL_1 0xC5
+#define ILI9340_CMD_VCOM_CTRL_2 0xC7
+#define ILI9340_CMD_POSITVE_GAMMA_CORRECTION 0xE0
+#define ILI9340_CMD_NEGATIVE_GAMMA_CORRECTION 0xE1
+
+#define ILI9340_DATA_MEM_ACCESS_CTRL_MY 0x80
+#define ILI9340_DATA_MEM_ACCESS_CTRL_MX 0x40
+#define ILI9340_DATA_MEM_ACCESS_CTRL_MV 0x20
+#define ILI9340_DATA_MEM_ACCESS_CTRL_ML 0x10
+#define ILI9340_DATA_MEM_ACCESS_CTRL_BGR 0x08
+#define ILI9340_DATA_MEM_ACCESS_CTRL_MH 0x04
+
+#define ILI9340_DATA_PIXEL_FORMAT_RGB_18_BIT 0x60
+#define ILI9340_DATA_PIXEL_FORMAT_RGB_16_BIT 0x50
+#define ILI9340_DATA_PIXEL_FORMAT_MCU_18_BIT 0x06
+#define ILI9340_DATA_PIXEL_FORMAT_MCU_16_BIT 0x05
+
+struct ili9340_data;
+
+/**
+ * Send data to ILI9340 display controller
+ *
+ * @param data Device data structure
+ * @param cmd Command to send to display controller
+ * @param tx_data Data to transmit to the display controller
+ * In case no data should be transmitted pass a NULL pointer
+ * @param tx_len Number of bytes in tx_data buffer
+ *
+ */
+void ili9340_transmit(struct ili9340_data *data, u8_t cmd, void *tx_data,
+        size_t tx_len);
+
+/**
+ * Perform LCD specific initialization
+ *
+ * @param data Device data structure
+ */
+void ili9340_lcd_init(struct ili9340_data *data);
+
+#define DT_ILITEK_ILI9340_0_LABEL "DISPLAY"
+#define CONFIG_DISPLAY_LOG_LEVEL 0
+
+#endif /* ZEPHYR_DRIVERS_DISPLAY_DISPLAY_ILI9340_H_ */

samples/gui/wasm-runtime-wgl/src/platform/zephyr/display_ili9340_adafruit_1480.c

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2017 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "display_ili9340.h"
+
+void ili9340_lcd_init(struct ili9340_data *data)
+{
+    u8_t tx_data[15];
+
+    tx_data[0] = 0x23;
+    ili9340_transmit(data, ILI9340_CMD_POWER_CTRL_1, tx_data, 1);
+
+    tx_data[0] = 0x10;
+    ili9340_transmit(data, ILI9340_CMD_POWER_CTRL_2, tx_data, 1);
+
+    tx_data[0] = 0x3e;
+    tx_data[1] = 0x28;
+    ili9340_transmit(data, ILI9340_CMD_VCOM_CTRL_1, tx_data, 2);
+
+    tx_data[0] = 0x86;
+    ili9340_transmit(data, ILI9340_CMD_VCOM_CTRL_2, tx_data, 1);
+
+    tx_data[0] =
+    ILI9340_DATA_MEM_ACCESS_CTRL_MV | ILI9340_DATA_MEM_ACCESS_CTRL_BGR;
+    ili9340_transmit(data, ILI9340_CMD_MEM_ACCESS_CTRL, tx_data, 1);
+
+    tx_data[0] = ILI9340_DATA_PIXEL_FORMAT_MCU_18_BIT |
+    ILI9340_DATA_PIXEL_FORMAT_RGB_18_BIT;
+    ili9340_transmit(data, ILI9340_CMD_PIXEL_FORMAT_SET, tx_data, 1);
+
+    tx_data[0] = 0x00;
+    tx_data[1] = 0x18;
+    ili9340_transmit(data, ILI9340_CMD_FRAME_CTRL_NORMAL_MODE, tx_data, 2);
+
+    tx_data[0] = 0x08;
+    tx_data[1] = 0x82;
+    tx_data[2] = 0x27;
+    ili9340_transmit(data, ILI9340_CMD_DISPLAY_FUNCTION_CTRL, tx_data, 3);
+
+    tx_data[0] = 0x01;
+    ili9340_transmit(data, ILI9340_CMD_GAMMA_SET, tx_data, 1);
+
+    tx_data[0] = 0x0F;
+    tx_data[1] = 0x31;
+    tx_data[2] = 0x2B;
+    tx_data[3] = 0x0C;
+    tx_data[4] = 0x0E;
+    tx_data[5] = 0x08;
+    tx_data[6] = 0x4E;
+    tx_data[7] = 0xF1;
+    tx_data[8] = 0x37;
+    tx_data[9] = 0x07;
+    tx_data[10] = 0x10;
+    tx_data[11] = 0x03;
+    tx_data[12] = 0x0E;
+    tx_data[13] = 0x09;
+    tx_data[14] = 0x00;
+    ili9340_transmit(data, ILI9340_CMD_POSITVE_GAMMA_CORRECTION, tx_data, 15);
+
+    tx_data[0] = 0x00;
+    tx_data[1] = 0x0E;
+    tx_data[2] = 0x14;
+    tx_data[3] = 0x03;
+    tx_data[4] = 0x11;
+    tx_data[5] = 0x07;
+    tx_data[6] = 0x31;
+    tx_data[7] = 0xC1;
+    tx_data[8] = 0x48;
+    tx_data[9] = 0x08;
+    tx_data[10] = 0x0F;
+    tx_data[11] = 0x0C;
+    tx_data[12] = 0x31;
+    tx_data[13] = 0x36;
+    tx_data[14] = 0x0F;
+    ili9340_transmit(data, ILI9340_CMD_NEGATIVE_GAMMA_CORRECTION, tx_data, 15);
+}

samples/gui/wasm-runtime-wgl/src/platform/zephyr/iwasm_main.c

@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "bh_platform.h"
+#include "runtime_lib.h"
+#include "native_interface.h"
+#include "app_manager_export.h"
+#include "board_config.h"
+#include "bh_common.h"
+#include "bh_queue.h"
+#include "bh_thread.h"
+#include "bh_memory.h"
+#include "runtime_sensor.h"
+#include "attr_container.h"
+#include "module_wasm_app.h"
+#include "wasm_export.h"
+#include "display.h"
+#include "lvgl.h"
+
+extern void * thread_timer_check(void *);
+extern void init_sensor_framework();
+extern int aee_host_msg_callback(void *msg, uint16_t msg_len);
+extern bool touchscreen_read(lv_indev_data_t * data);
+extern int ili9340_init();
+extern void xpt2046_init(void);
+extern void wgl_init();
+
+#include <zephyr.h>
+#include <uart.h>
+#include <device.h>
+
+int uart_char_cnt = 0;
+
+static void uart_irq_callback(struct device *dev)
+{
+    unsigned char ch;
+
+    while (uart_poll_in(dev, &ch) == 0) {
+        uart_char_cnt++;
+        aee_host_msg_callback(&ch, 1);
+    }
+}
+
+struct device *uart_dev = NULL;
+
+static bool host_init()
+{
+    uart_dev = device_get_binding(HOST_DEVICE_COMM_UART_NAME);
+    if (!uart_dev) {
+        printf("UART: Device driver not found.\n");
+        return false;
+    }
+    uart_irq_rx_enable(uart_dev);
+    uart_irq_callback_set(uart_dev, uart_irq_callback);
+    return true;
+}
+
+int host_send(void * ctx, const char *buf, int size)
+{
+    for (int i = 0; i < size; i++)
+        uart_poll_out(uart_dev, buf[i]);
+
+    return size;
+}
+
+void host_destroy()
+{
+}
+
+host_interface interface = {
+    .init = host_init,
+    .send = host_send,
+    .destroy = host_destroy
+};
+
+timer_ctx_t timer_ctx;
+
+static char global_heap_buf[270 * 1024] = { 0 };
+
+static uint8_t color_copy[320 * 10 * 3];
+
+static void display_flush(lv_disp_drv_t *disp_drv,
+                          const lv_area_t *area,
+                          lv_color_t *color)
+{
+    u16_t w = area->x2 - area->x1 + 1;
+    u16_t h = area->y2 - area->y1 + 1;
+    struct display_buffer_descriptor desc;
+    int i;
+    uint8_t *color_p = color_copy;
+
+    desc.buf_size = 3 * w * h;
+    desc.width = w;
+    desc.pitch = w;
+    desc.height = h;
+
+    for (i = 0; i < w * h; i++, color++) {
+        color_p[i * 3] = color->ch.red;
+        color_p[i * 3 + 1] = color->ch.green;
+        color_p[i * 3 + 2] = color->ch.blue;
+    }
+
+    display_write(NULL, area->x1, area->y1, &desc, (void *) color_p);
+
+    lv_disp_flush_ready(disp_drv); /* in v5.3 is lv_flush_ready */
+}
+
+static bool display_input_read(lv_indev_drv_t *indev_drv, lv_indev_data_t *data)
+{
+    return touchscreen_read(data);
+}
+
+/**
+ * Initialize the Hardware Abstraction Layer (HAL) for the Littlev graphics library
+ */
+static void hal_init(void)
+{
+    xpt2046_init();
+    ili9340_init();
+    display_blanking_off(NULL);
+
+    /*Create a display buffer*/
+    static lv_disp_buf_t disp_buf1;
+    static lv_color_t buf1_1[320*10];
+    lv_disp_buf_init(&disp_buf1, buf1_1, NULL, 320*10);
+
+    /*Create a display*/
+    lv_disp_drv_t disp_drv;
+    lv_disp_drv_init(&disp_drv);            /*Basic initialization*/
+    disp_drv.buffer = &disp_buf1;
+    disp_drv.flush_cb = display_flush;
+    //    disp_drv.hor_res = 200;
+    //    disp_drv.ver_res = 100;
+    lv_disp_drv_register(&disp_drv);
+
+    lv_indev_drv_t indev_drv;
+    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
+    indev_drv.type = LV_INDEV_TYPE_POINTER;
+    indev_drv.read_cb = display_input_read;
+    lv_indev_drv_register(&indev_drv);
+}
+
+int iwasm_main()
+{
+    host_init();
+
+    if (bh_memory_init_with_pool(global_heap_buf, sizeof(global_heap_buf))
+            != 0) {
+        printf("Init global heap failed.\n");
+        return -1;
+    }
+
+    if (vm_thread_sys_init() != 0) {
+        goto fail1;
+    }
+
+    wgl_init();
+    hal_init();
+
+    // timer manager
+    init_wasm_timer();
+
+    // TODO:
+    app_manager_startup(&interface);
+
+fail1:
+    bh_memory_destroy();
+    return -1;
+}

samples/gui/wasm-runtime-wgl/src/platform/zephyr/main.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "bh_platform.h"
+#include "wasm_assert.h"
+#include "wasm_log.h"
+#include "wasm_platform_log.h"
+#include "wasm_thread.h"
+#include "wasm_export.h"
+#include "wasm_memory.h"
+#include "bh_memory.h"
+
+extern int iwasm_main();
+
+void main(void)
+{
+    iwasm_main();
+    for(;;){
+        k_sleep(1000);
+    }
+}
+

samples/gui/wasm-runtime-wgl/src/platform/zephyr/pin_config_jlf.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef __PIN_CONFIG_JLF_H__
+#define __PIN_CONFIG_JLF_H__
+
+#define DT_ILITEK_ILI9340_0_BUS_NAME "SPI_2"
+#define DT_ILITEK_ILI9340_0_SPI_MAX_FREQUENCY 10*1000
+
+#define DT_ILITEK_ILI9340_0_BASE_ADDRESS      1
+#define DT_ILITEK_ILI9340_0_RESET_GPIOS_CONTROLLER "GPIO_0"
+#define DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN 5
+#define DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER "GPIO_0"
+#define DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN 4
+
+#define XPT2046_SPI_DEVICE_NAME "SPI_2"
+#define XPT2046_SPI_MAX_FREQUENCY 10*1000
+#define XPT2046_CS_GPIO_CONTROLLER "GPIO_0"
+#define XPT2046_CS_GPIO_PIN         6
+
+#define XPT2046_PEN_GPIO_CONTROLLER "GPIO_0"
+#define XPT2046_PEN_GPIO_PIN         7
+
+#define HOST_DEVICE_COMM_UART_NAME "UART_1"
+#endif /* __PIN_CONFIG_JLF_H__ */

samples/gui/wasm-runtime-wgl/src/platform/zephyr/pin_config_stm32.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef __PIN_CONFIG_STM32_H__
+#define __PIN_CONFIG_STM32_H__
+
+#define DT_ILITEK_ILI9340_0_BUS_NAME "SPI_1"
+#define DT_ILITEK_ILI9340_0_SPI_MAX_FREQUENCY 24*1000*1000
+
+#define DT_ILITEK_ILI9340_0_BASE_ADDRESS      1
+#define DT_ILITEK_ILI9340_0_RESET_GPIOS_CONTROLLER "GPIOC"
+#define DT_ILITEK_ILI9340_0_RESET_GPIOS_PIN    12
+#define DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_CONTROLLER "GPIOC"
+#define DT_ILITEK_ILI9340_0_CMD_DATA_GPIOS_PIN 11
+
+#define DT_ILITEK_ILI9340_0_CS_GPIO_CONTROLLER  "GPIOC"
+#define DT_ILITEK_ILI9340_0_CS_GPIO_PIN            10
+
+#define XPT2046_SPI_DEVICE_NAME "SPI_1"
+#define XPT2046_SPI_MAX_FREQUENCY 12*1000*1000
+#define XPT2046_CS_GPIO_CONTROLLER "GPIOD"
+#define XPT2046_CS_GPIO_PIN         0
+
+#define XPT2046_PEN_GPIO_CONTROLLER "GPIOD"
+#define XPT2046_PEN_GPIO_PIN         1
+
+#define HOST_DEVICE_COMM_UART_NAME "UART_6"
+
+#endif /* __PIN_CONFIG_STM32_H__ */

samples/gui/wasm-runtime-wgl/zephyr-build/CMakeLists.txt

@@ -0,0 +1,127 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 3.8.2)
+
+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+enable_language (ASM)
+
+zephyr_compile_definitions (-DNVALGRIND
+    -D__JLF__
+    -D__ZEPHYR__
+    -DWASM_ENABLE_BASE_LIB
+    -Dattr_container_malloc=bh_malloc
+    -Dattr_container_free=bh_free)
+
+set (IWASM_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/core/iwasm)
+set (APP_MGR_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/core/app-mgr)
+set (SHARED_LIB_ROOT ${IWASM_ROOT}/../shared-lib)
+
+target_include_directories(app PRIVATE ${IWASM_ROOT}/runtime/include
+    ${IWASM_ROOT}/runtime/platform/zephyr
+    ${IWASM_ROOT}/runtime/platform/include
+    ${IWASM_ROOT}/runtime/utils
+    ${IWASM_ROOT}/runtime/vmcore-wasm
+    ${IWASM_ROOT}/lib/native/base
+    ${IWASM_ROOT}/lib/native/libc
+    ${IWASM_ROOT}/lib/native/extension/sensor
+    ${IWASM_ROOT}/lib/native/extension/connection
+    ${IWASM_ROOT}/lib/native/extension/gui
+    ${IWASM_ROOT}/lib/native-interface
+    ${IWASM_ROOT}/lib/3rdparty
+    ${IWASM_ROOT}/lib/3rdparty/lvgl
+    ${IWASM_ROOT}/lib/3rdparty/lvgl/src
+    ${APP_MGR_ROOT}/app-manager
+    ${APP_MGR_ROOT}/app-mgr-shared
+    ${SHARED_LIB_ROOT}/include
+    ${SHARED_LIB_ROOT}/platform/include
+    ${SHARED_LIB_ROOT}/platform/zephyr
+    ${SHARED_LIB_ROOT}/mem-alloc/ems
+    ${SHARED_LIB_ROOT}/utils
+    ${SHARED_LIB_ROOT}/coap/er-coap
+    ${SHARED_LIB_ROOT}/coap/extension
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr
+    )
+
+file (GLOB_RECURSE GUI_SRC ${IWASM_ROOT}/lib/native/extension/gui/*.c ${IWASM_ROOT}/lib/3rdparty/lvgl/*.c)
+
+set (IWASM_SRCS
+    ${IWASM_ROOT}/runtime/platform/zephyr/wasm_native.c
+    ${IWASM_ROOT}/runtime/utils/wasm_dlfcn.c
+    ${IWASM_ROOT}/runtime/utils/wasm_hashmap.c
+    ${IWASM_ROOT}/runtime/utils/wasm_log.c
+    ${IWASM_ROOT}/runtime/utils/wasm_vector.c
+    ${IWASM_ROOT}/runtime/vmcore-wasm/wasm_application.c
+    ${IWASM_ROOT}/runtime/vmcore-wasm/wasm_interp.c
+    ${IWASM_ROOT}/runtime/vmcore-wasm/wasm_loader.c
+    ${IWASM_ROOT}/runtime/vmcore-wasm/wasm_runtime.c
+    ${IWASM_ROOT}/runtime/vmcore-wasm/invokeNative_general.c
+    ${IWASM_ROOT}/lib/native/base/base_lib_export.c
+    ${IWASM_ROOT}/lib/native/base/request_response.c
+    ${IWASM_ROOT}/lib/native/base/timer_wrapper.c
+    ${IWASM_ROOT}/lib/native/libc/libc_wrapper.c
+    ${IWASM_ROOT}/lib/native/extension/sensor/runtime_sensor.c
+    ${IWASM_ROOT}/lib/native/extension/connection/connection_wrapper.c
+    ${IWASM_ROOT}/lib/native/extension/connection/zephyr/connection_lib_impl.c
+    ${GUI_SRC}
+    ${IWASM_ROOT}/lib/native-interface/attr_container.c
+    ${IWASM_ROOT}/lib/native-interface/restful_utils.c
+    ${APP_MGR_ROOT}/app-manager/app_manager.c
+    ${APP_MGR_ROOT}/app-manager/app_manager_host.c
+    ${APP_MGR_ROOT}/app-manager/ble_msg.c
+    ${APP_MGR_ROOT}/app-manager/event.c
+    ${APP_MGR_ROOT}/app-manager/message.c
+    ${APP_MGR_ROOT}/app-manager/module_jeff.c
+    ${APP_MGR_ROOT}/app-manager/module_utils.c
+    ${APP_MGR_ROOT}/app-manager/module_wasm_app.c
+    ${APP_MGR_ROOT}/app-manager/module_wasm_lib.c
+    ${APP_MGR_ROOT}/app-manager/resource_reg.c
+    ${APP_MGR_ROOT}/app-manager/watchdog.c
+    ${APP_MGR_ROOT}/app-manager/platform/zephyr/app_mgr_zephyr.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_assert.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_definition.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_platform.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_platform_log.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_thread.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_time.c
+    ${SHARED_LIB_ROOT}/platform/zephyr/bh_math.c
+    ${SHARED_LIB_ROOT}/mem-alloc/bh_memory.c
+    ${SHARED_LIB_ROOT}/mem-alloc/mem_alloc.c
+    ${SHARED_LIB_ROOT}/mem-alloc/ems/ems_alloc.c
+    ${SHARED_LIB_ROOT}/mem-alloc/ems/ems_hmu.c
+    ${SHARED_LIB_ROOT}/mem-alloc/ems/ems_kfc.c
+    ${SHARED_LIB_ROOT}/mem-alloc/tlsf/tlsf.c
+    ${SHARED_LIB_ROOT}/utils/bh_list.c
+    ${SHARED_LIB_ROOT}/utils/bh_log.c
+    ${SHARED_LIB_ROOT}/utils/bh_queue.c
+    ${SHARED_LIB_ROOT}/utils/runtime_timer.c
+    ${SHARED_LIB_ROOT}/coap/er-coap/er-coap.c
+    ${SHARED_LIB_ROOT}/coap/extension/coap_conversion.c
+    ${SHARED_LIB_ROOT}/coap/extension/coap_over_tcp.c
+    )
+
+    set (LVGL_DRV_SRCS
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr/display_ili9340_adafruit_1480.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr/display_ili9340.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr/XPT2046.c
+    )
+
+target_sources(app PRIVATE ${IWASM_SRCS}  
+    ${LVGL_DRV_SRCS}
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr/main.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/zephyr/iwasm_main.c
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/ext_lib_export.c)

samples/gui/wasm-runtime-wgl/zephyr-build/prj.conf

@@ -0,0 +1,7 @@
+CONFIG_SPI=y
+CONFIG_SPI_STM32=y
+CONFIG_SPI_1=y
+CONFIG_PRINTK=y
+CONFIG_LOG=y
+#CONFIG_UART_2=y
+CONFIG_UART_INTERRUPT_DRIVEN=y

samples/littlevgl/README.md

@@ -42,7 +42,7 @@ Linux
 --------------------------------
 - Build</br>
 `./build.sh`</br>
-    All binaries are in "out", which contains "host_tool", "vgl_native_ui_app", "TestApplet1.wasm" and "vgl_wasm_runtime".
+    All binaries are in "out", which contains "host_tool", "vgl_native_ui_app", "ui_app.wasm" and "vgl_wasm_runtime".
 - Run native Linux application</br>
 `./vgl_native_ui_app`</br>
 

samples/littlevgl/wasm-apps/Makefile_wasm_app

@@ -24,6 +24,7 @@ CFLAGS += -O3 \
 	  -I$(IWASM_DIR)/lib/app-libs/base/ \
 	  -I$(IWASM_DIR)/lib/native-interface/ \
 	  -I$(IWASM_DIR)/lib/app-libs/extension/sensor \
+	  -I$(IWASM_DIR)/lib/app-libs/extension/gui \
 	  -I$(IWASM_DIR)/lib/app-libs/extension/connection
 
 SRCS += lvgl/lv_draw/lv_draw_line.c lvgl/lv_draw/lv_draw_rbasic.c

samples/simple/CMakeLists.txt

@@ -48,6 +48,29 @@ set(WASM_DIR  ${WAMR_ROOT_DIR}/core/iwasm)
 set(APP_MGR_DIR ${WAMR_ROOT_DIR}/core/app-mgr)
 set(SHARED_DIR ${WAMR_ROOT_DIR}/core/shared-lib)
 
+set (lv_drivers_name lv_drivers)
+set (lv_name lvgl)
+set (LV_DRIVERS_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src/${lv_drivers_name})
+set (LVGL_DIR ${WASM_DIR}/lib/3rdparty/${lv_name})
+
+if ((NOT EXISTS ${LVGL_DIR}) OR (NOT EXISTS ${LV_DRIVERS_DIR}))
+        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/CMakeLists.txt.in ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers/CMakeLists.txt)
+
+        execute_process(COMMAND ${CMAKE_COMMAND} -G "${CMAKE_GENERATOR}" .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers )
+        if(result)
+                message(FATAL_ERROR "CMake step for lvgl drivers failed: ${result}")
+        endif()
+        execute_process(COMMAND ${CMAKE_COMMAND} --build .
+                RESULT_VARIABLE result
+                WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/download_lvgl_drivers )
+        if(result)
+                message(FATAL_ERROR "Build step for lvgl drivers failed: ${result}")
+        endif()
+endif()
+
+file(GLOB_RECURSE LV_DRIVERS_SOURCES "${LV_DRIVERS_DIR}/*.c" )
 
 enable_language (ASM)
 
@@ -57,6 +80,7 @@ include (${WASM_DIR}/runtime/vmcore-wasm/vmcore.cmake)
 include (${WASM_DIR}/lib/native/base/wasm_lib_base.cmake)
 include (${WASM_DIR}/lib/native/libc/wasm_libc.cmake)
 include (${WASM_DIR}/lib/native/extension/sensor/wasm_lib_sensor.cmake)
+include (${WASM_DIR}/lib/native/extension/gui/wasm_lib_gui.cmake)
 include (${WASM_DIR}/lib/native/extension/connection/wasm_lib_conn.cmake)
 include (${WASM_DIR}/lib/native/extension/connection/${TARGET_PLATFORM}/connection_mgr.cmake)
 include (${WASM_DIR}/lib/native-interface/native_interface.cmake)
@@ -85,6 +109,7 @@ add_library (vmlib
              ${WASM_LIB_BASE_SOURCE}
              ${WASM_LIB_EXT_SOURCE}
              ${WASM_LIB_SENSOR_SOURCE}
+             ${WASM_LIB_GUI_SOURCE}
              ${WASM_LIB_CONN_SOURCE}
              ${WASM_LIB_CONN_MGR_SOURCE}
              ${PLATFORM_SHARED_SOURCE}
@@ -93,7 +118,7 @@ add_library (vmlib
              ${NATIVE_INTERFACE_SOURCE}
             )
 
-add_executable (simple src/main.c src/iwasm_main.c src/ext_lib_export.c)
+    add_executable (simple src/main.c src/iwasm_main.c src/ext_lib_export.c ${LV_DRIVERS_SOURCES})
 
-target_link_libraries (simple vmlib -lm -ldl -lpthread)
+target_link_libraries (simple vmlib -lm -ldl -lpthread -lSDL2)
 

samples/simple/CMakeLists.txt.in

@@ -0,0 +1,41 @@
+# Copyright (C) 2019 Intel Corporation.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+cmake_minimum_required(VERSION 2.8.2)
+
+project(lvgl_download NONE)
+
+include(ExternalProject)
+
+ExternalProject_Add(${lv_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lvgl.git
+    GIT_TAG        ""
+    BINARY_DIR     ""
+    SOURCE_DIR            "${LVGL_DIR}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )
+
+ExternalProject_Add(${lv_drivers_name}
+    GIT_REPOSITORY https://github.com/littlevgl/lv_drivers.git
+    GIT_TAG        ""
+    BINARY_DIR     ""
+    SOURCE_DIR            "${LV_DRIVERS_DIR}"
+    CONFIGURE_COMMAND     ""
+    BUILD_COMMAND         ""
+    INSTALL_COMMAND       ""
+    TEST_COMMAND          ""
+  )

samples/simple/README.md

@@ -19,6 +19,7 @@ simple/
     ├── connection.c
     ├── event_publisher.c
     ├── event_subscriber.c
+    ├── gui.c
     ├── request_handler.c
     ├── request_sender.c
     ├── sensor.c
@@ -63,6 +64,20 @@ The `host_init_func` is called when the application manager starts up. And `host
 - wasm-apps<br/>
   Source files of sample wasm applications.
 
+Install required SDK and libraries
+==============
+- 32 bit SDL(simple directmedia layer)
+Use apt-get</br>
+    `sudo apt-get install libsdl2-dev:i386`</br>
+Or download source from www.libsdl.org</br>
+    `./configure C_FLAGS=-m32 CXX_FLAGS=-m32 LD_FLAGS=-m32`</br>
+    `make`</br>
+    `sudo make install`</br>
+- Install EMSDK
+<pre>
+    https://emscripten.org/docs/tools_reference/emsdk.html
+</pre>
+
 Build all binaries
 ==============
 Execute the build.sh script then all binaries including wasm application files would be generated in 'out' directory.
@@ -78,6 +93,7 @@ out/
     ├── connection.wasm
     ├── event_publisher.wasm
     ├── event_subscriber.wasm
+    ├── gui.wasm
     ├── request_handler.wasm
     ├── request_sender.wasm
     ├── sensor.wasm
@@ -102,6 +118,8 @@ out/
     This application shows the sub/pub programming model. The pub application publishes the event "alert/overheat" by calling api_publish_event() API. The subscriber could be host_tool or other wasm application.
     + event_subscriber.wasm<br/>
     This application shows the sub/pub programming model. The sub application subscribes the "alert/overheat" event by calling api_subscribe_event() API so that it is able to receive the event once generated and published by the pub application. To make the process clear to interpret, the sub application dumps the event when receiving it.
+    + gui.wasm<br/>
+    This application shows the built-in 2D graphical user interface API with which various widgets could be created.
     + request_handler.wasm<br/>
     This application shows the request/response programming model. The request handler application registers 2 resources(/url1 and /url2) by calling api_register_resource_handler() API. The request sender could be host_tool or other wasm application.
     + request_sender.wasm<br/>

samples/simple/build.sh

@@ -8,7 +8,7 @@ BUILD_DIR=${PWD}/build
 IWASM_ROOT=${PWD}/../../core/iwasm
 APP_LIBS=${IWASM_ROOT}/lib/app-libs
 NATIVE_LIBS=${IWASM_ROOT}/lib/native-interface
-APP_LIB_SRC="${APP_LIBS}/base/*.c ${APP_LIBS}/extension/sensor/*.c ${APP_LIBS}/extension/connection/*.c ${NATIVE_LIBS}/*.c"
+APP_LIB_SRC="${APP_LIBS}/base/*.c ${APP_LIBS}/extension/sensor/*.c ${APP_LIBS}/extension/connection/*.c ${APP_LIBS}/extension/gui/src/*.c ${NATIVE_LIBS}/*.c"
 WASM_APPS=${PWD}/wasm-apps
 
 rm -rf ${OUT_DIR}
@@ -57,10 +57,11 @@ APP_SRC="$i ${APP_LIB_SRC}"
 OUT_FILE=${i%.*}.wasm
 emcc -O3 -I${APP_LIBS}/base -I${APP_LIBS}/extension/sensor -I${NATIVE_LIBS} \
      -I${APP_LIBS}/extension/connection \
+     -I${APP_LIBS}/extension/gui \
      -s WASM=1 -s SIDE_MODULE=1 -s ASSERTIONS=1 -s STACK_OVERFLOW_CHECK=2 \
      -s TOTAL_MEMORY=65536 -s TOTAL_STACK=4096 \
      -s "EXPORTED_FUNCTIONS=['_on_init', '_on_destroy', '_on_request', '_on_response', \
-                             '_on_sensor_event', '_on_timer_callback', '_on_connection_data']" \
+                             '_on_sensor_event', '_on_timer_callback', '_on_connection_data', '_on_widget_event']" \
      -o ${OUT_DIR}/wasm-apps/${OUT_FILE} ${APP_SRC}
 if [ -f ${OUT_DIR}/wasm-apps/${OUT_FILE} ]; then
         echo "build ${OUT_FILE} success"

samples/simple/src/ext_lib_export.c

@@ -1,10 +1,12 @@
 #include "lib_export.h"
 #include "sensor_api.h"
 #include "connection_api.h"
+#include "gui_api.h"
 
 static NativeSymbol extended_native_symbol_defs[] = {
 #include "runtime_sensor.inl"
 #include "connection.inl"
+#include "wamr_gui.inl"
         };
 
 #include "ext_lib_export.h"

samples/simple/src/iwasm_main.c

@@ -32,6 +32,10 @@
 #include "attr_container.h"
 #include "module_wasm_app.h"
 #include "wasm_export.h"
+
+#include "lv_drivers/display/monitor.h"
+#include "lv_drivers/indev/mouse.h"
+
 #define MAX 2048
 
 #ifndef CONNECTION_UART
@@ -47,6 +51,7 @@ extern void * thread_timer_check(void *);
 extern void init_sensor_framework();
 extern int aee_host_msg_callback(void *msg, uint16_t msg_len);
 extern bool init_connection_framework();
+extern void wgl_init();
 
 #ifndef CONNECTION_UART
 int listenfd = -1;
@@ -425,6 +430,37 @@ static bool parse_args(int argc, char *argv[])
     return true;
 }
 
+/**
+ * Initialize the Hardware Abstraction Layer (HAL) for the Littlev graphics library
+ */
+static void hal_init(void)
+{
+    /* Use the 'monitor' driver which creates window on PC's monitor to simulate a display*/
+    monitor_init();
+
+    /*Create a display buffer*/
+    static lv_disp_buf_t disp_buf1;
+    static lv_color_t buf1_1[480*10];
+    lv_disp_buf_init(&disp_buf1, buf1_1, NULL, 480*10);
+
+    /*Create a display*/
+    lv_disp_drv_t disp_drv;
+    lv_disp_drv_init(&disp_drv);            /*Basic initialization*/
+    disp_drv.buffer = &disp_buf1;
+    disp_drv.flush_cb = monitor_flush;
+    //    disp_drv.hor_res = 200;
+    //    disp_drv.ver_res = 100;
+    lv_disp_drv_register(&disp_drv);
+
+    /* Add the mouse as input device
+    * Use the 'mouse' driver which reads the PC's mouse*/
+    mouse_init();
+    lv_indev_drv_t indev_drv;
+    lv_indev_drv_init(&indev_drv);          /*Basic initialization*/
+    indev_drv.type = LV_INDEV_TYPE_POINTER;
+    indev_drv.read_cb = mouse_read;         /*This function will be called periodically (by the library) to get the mouse position and state*/
+    lv_indev_drv_register(&indev_drv);
+}
 // Driver function
 int iwasm_main(int argc, char *argv[])
 {
@@ -448,6 +484,8 @@ int iwasm_main(int argc, char *argv[])
         goto fail1;
     }
 
+    wgl_init();
+    hal_init();
     init_sensor_framework();
 
     // timer manager

samples/simple/src/lv_drv_conf.h

@@ -0,0 +1,310 @@
+/**
+ * @file lv_drv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS lv_drv_conf.h
+ */
+
+#if 1 /*Set it to "1" to enable the content*/
+
+#ifndef LV_DRV_CONF_H
+#define LV_DRV_CONF_H
+
+#include "lv_conf.h"
+
+/*********************
+ * DELAY INTERFACE
+ *********************/
+#define LV_DRV_DELAY_INCLUDE  <stdint.h>            /*Dummy include by default*/
+#define LV_DRV_DELAY_US(us)  /*delay_us(us)*/       /*Delay the given number of microseconds*/
+#define LV_DRV_DELAY_MS(ms)  /*delay_ms(ms)*/       /*Delay the given number of milliseconds*/
+
+/*********************
+ * DISPLAY INTERFACE
+ *********************/
+
+/*------------
+ *  Common
+ *------------*/
+#define LV_DRV_DISP_INCLUDE         <stdint.h>           /*Dummy include by default*/
+#define LV_DRV_DISP_CMD_DATA(val)  /*pin_x_set(val)*/    /*Set the command/data pin to 'val'*/
+#define LV_DRV_DISP_RST(val)       /*pin_x_set(val)*/    /*Set the reset pin to 'val'*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_DISP_SPI_CS(val)          /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_DISP_SPI_WR_BYTE(data)    /*spi_wr(data)*/        /*Write a byte the SPI bus*/
+#define LV_DRV_DISP_SPI_WR_ARRAY(adr, n) /*spi_wr_mem(adr, n)*/  /*Write 'n' bytes to SPI bus from 'adr'*/
+
+/*------------------
+ *  Parallel port
+ *-----------------*/
+#define LV_DRV_DISP_PAR_CS(val)          /*par_cs_set(val)*/   /*Set the Parallel port's Chip select to 'val'*/
+#define LV_DRV_DISP_PAR_SLOW             /*par_slow()*/        /*Set low speed on the parallel port*/
+#define LV_DRV_DISP_PAR_FAST             /*par_fast()*/        /*Set high speed on the parallel port*/
+#define LV_DRV_DISP_PAR_WR_WORD(data)    /*par_wr(data)*/      /*Write a word to the parallel port*/
+#define LV_DRV_DISP_PAR_WR_ARRAY(adr, n) /*par_wr_mem(adr,n)*/ /*Write 'n' bytes to Parallel ports from 'adr'*/
+
+/***************************
+ * INPUT DEVICE INTERFACE
+ ***************************/
+
+/*----------
+ *  Common
+ *----------*/
+#define LV_DRV_INDEV_INCLUDE     <stdint.h>             /*Dummy include by default*/
+#define LV_DRV_INDEV_RST(val)    /*pin_x_set(val)*/     /*Set the reset pin to 'val'*/
+#define LV_DRV_INDEV_IRQ_READ    0 /*pn_x_read()*/      /*Read the IRQ pin*/
+
+/*---------
+ *  SPI
+ *---------*/
+#define LV_DRV_INDEV_SPI_CS(val)            /*spi_cs_set(val)*/     /*Set the SPI's Chip select to 'val'*/
+#define LV_DRV_INDEV_SPI_XCHG_BYTE(data)    0 /*spi_xchg(val)*/     /*Write 'val' to SPI and give the read value*/
+
+/*---------
+ *  I2C
+ *---------*/
+#define LV_DRV_INDEV_I2C_START              /*i2c_start()*/       /*Make an I2C start*/
+#define LV_DRV_INDEV_I2C_STOP               /*i2c_stop()*/        /*Make an I2C stop*/
+#define LV_DRV_INDEV_I2C_RESTART            /*i2c_restart()*/     /*Make an I2C restart*/
+#define LV_DRV_INDEV_I2C_WR(data)           /*i2c_wr(data)*/      /*Write a byte to the I1C bus*/
+#define LV_DRV_INDEV_I2C_READ(last_read)    0 /*i2c_rd()*/        /*Read a byte from the I2C bud*/
+
+
+/*********************
+ *  DISPLAY DRIVERS
+ *********************/
+
+/*-------------------
+ *  Monitor of PC
+ *-------------------*/
+#ifndef USE_MONITOR
+#  define USE_MONITOR         1
+#endif
+
+#if USE_MONITOR
+#  define MONITOR_HOR_RES     LV_HOR_RES_MAX
+#  define MONITOR_VER_RES     LV_VER_RES_MAX
+
+/* Scale window by this factor (useful when simulating small screens) */
+#  define MONITOR_ZOOM        1
+
+/* Used to test true double buffering with only address changing.
+ * Set LV_VDB_SIZE = (LV_HOR_RES * LV_VER_RES) and  LV_VDB_DOUBLE = 1 and LV_COLOR_DEPTH = 32" */
+#  define MONITOR_DOUBLE_BUFFERED 0
+
+/*Eclipse: <SDL2/SDL.h>    Visual Studio: <SDL.h>*/
+#  define MONITOR_SDL_INCLUDE_PATH    <SDL2/SDL.h>
+
+/*Different rendering might be used if running in a Virtual machine*/
+#  define MONITOR_VIRTUAL_MACHINE 0
+
+/*Open two windows to test multi display support*/
+#  define MONITOR_DUAL            0
+#endif
+
+/*-----------------------------------
+ *  Native Windows (including mouse)
+ *----------------------------------*/
+#ifndef USE_WINDOWS
+#  define USE_WINDOWS       0
+#endif
+
+#define USE_WINDOWS         0
+#if USE_WINDOWS
+#  define WINDOW_HOR_RES      480
+#  define WINDOW_VER_RES      320
+#endif
+
+/*----------------
+ *    SSD1963
+ *--------------*/
+#ifndef USE_SSD1963
+#  define USE_SSD1963         0
+#endif
+
+#if USE_SSD1963
+#  define SSD1963_HOR_RES     LV_HOR_RES
+#  define SSD1963_VER_RES     LV_VER_RES
+#  define SSD1963_HT          531
+#  define SSD1963_HPS         43
+#  define SSD1963_LPS         8
+#  define SSD1963_HPW         10
+#  define SSD1963_VT          288
+#  define SSD1963_VPS         12
+#  define SSD1963_FPS         4
+#  define SSD1963_VPW         10
+#  define SSD1963_HS_NEG      0   /*Negative hsync*/
+#  define SSD1963_VS_NEG      0   /*Negative vsync*/
+#  define SSD1963_ORI         0   /*0, 90, 180, 270*/
+#  define SSD1963_COLOR_DEPTH 16
+#endif
+
+/*----------------
+ *    R61581
+ *--------------*/
+#ifndef USE_R61581
+#  define USE_R61581          0
+#endif
+
+#if USE_R61581
+#  define R61581_HOR_RES      LV_HOR_RES
+#  define R61581_VER_RES      LV_VER_RES
+#  define R61581_HSPL         0       /*HSYNC signal polarity*/
+#  define R61581_HSL          10      /*HSYNC length (Not Implemented)*/
+#  define R61581_HFP          10      /*Horitontal Front poarch (Not Implemented)*/
+#  define R61581_HBP          10      /*Horitontal Back poarch (Not Implemented */
+#  define R61581_VSPL         0       /*VSYNC signal polarity*/
+#  define R61581_VSL          10      /*VSYNC length (Not Implemented)*/
+#  define R61581_VFP          8       /*Vertical Front poarch*/
+#  define R61581_VBP          8       /*Vertical Back poarch */
+#  define R61581_DPL          0       /*DCLK signal polarity*/
+#  define R61581_EPL          1       /*ENABLE signal polarity*/
+#  define R61581_ORI          0       /*0, 180*/
+#  define R61581_LV_COLOR_DEPTH 16    /*Fix 16 bit*/
+#endif
+
+/*------------------------------
+ *  ST7565 (Monochrome, low res.)
+ *-----------------------------*/
+#ifndef USE_ST7565
+#  define USE_ST7565          0
+#endif
+
+#if USE_ST7565
+/*No settings*/
+#endif  /*USE_ST7565*/
+
+/*-----------------------------------------
+ *  Linux frame buffer device (/dev/fbx)
+ *-----------------------------------------*/
+#ifndef USE_FBDEV
+#  define USE_FBDEV           1
+#endif
+
+#if USE_FBDEV
+#  define FBDEV_PATH          "/dev/fb0"
+#endif
+
+/*********************
+ *  INPUT DEVICES
+ *********************/
+
+/*--------------
+ *    XPT2046
+ *--------------*/
+#ifndef USE_XPT2046
+#  define USE_XPT2046         0
+#endif
+
+#if USE_XPT2046
+#  define XPT2046_HOR_RES     480
+#  define XPT2046_VER_RES     320
+#  define XPT2046_X_MIN       200
+#  define XPT2046_Y_MIN       200
+#  define XPT2046_X_MAX       3800
+#  define XPT2046_Y_MAX       3800
+#  define XPT2046_AVG         4
+#  define XPT2046_INV         0
+#endif
+
+/*-----------------
+ *    FT5406EE8
+ *-----------------*/
+#ifndef USE_FT5406EE8
+#  define USE_FT5406EE8       0
+#endif
+
+#if USE_FT5406EE8
+# define FT5406EE8_I2C_ADR   0x38                  /*7 bit address*/
+#endif
+
+/*---------------
+ *  AD TOUCH
+ *--------------*/
+#ifndef USE_AD_TOUCH
+#  define USE_AD_TOUCH        0
+#endif
+
+#if USE_AD_TOUCH
+/*No settings*/
+#endif
+
+
+/*---------------------------------------
+ * Mouse or touchpad on PC (using SDL)
+ *-------------------------------------*/
+#ifndef USE_MOUSE
+#  define USE_MOUSE           1
+#endif
+
+#if USE_MOUSE
+/*No settings*/
+#endif
+
+/*-------------------------------------------
+ * Mousewheel as encoder on PC (using SDL)
+ *------------------------------------------*/
+#ifndef USE_MOUSEWHEEL
+#  define USE_MOUSEWHEEL      1
+#endif
+
+#if USE_MOUSEWHEEL
+/*No settings*/
+#endif
+
+/*-------------------------------------------------
+ * Touchscreen as libinput interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_LIBINPUT
+#  define USE_LIBINPUT           0
+#endif
+
+#if USE_LIBINPUT
+#  define LIBINPUT_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#endif  /*USE_LIBINPUT*/
+
+/*-------------------------------------------------
+ * Mouse or touchpad as evdev interface (for Linux based systems)
+ *------------------------------------------------*/
+#ifndef USE_EVDEV
+#  define USE_EVDEV           0
+#endif
+
+#if USE_EVDEV
+#  define EVDEV_NAME   "/dev/input/event0"        /*You can use the "evtest" Linux tool to get the list of devices and test them*/
+#  define EVDEV_SWAP_AXES         0               /*Swap the x and y axes of the touchscreen*/
+
+#  define EVDEV_SCALE             0               /* Scale input, e.g. if touchscreen resolution does not match display resolution */
+#  if EVDEV_SCALE
+#    define EVDEV_SCALE_HOR_RES     (4096)          /* Horizontal resolution of touchscreen */
+#    define EVDEV_SCALE_VER_RES     (4096)          /* Vertical resolution of touchscreen */
+#  endif  /*EVDEV_SCALE*/
+
+#  define EVDEV_CALIBRATE         0               /*Scale and offset the touchscreen coordinates by using maximum and minimum values for each axis*/
+#  if EVDEV_CALIBRATE
+#    define EVDEV_HOR_MIN   3800                    /*If EVDEV_XXX_MIN > EVDEV_XXX_MAX the XXX axis is automatically inverted*/
+#    define EVDEV_HOR_MAX   200
+#    define EVDEV_VER_MIN   200
+#    define EVDEV_VER_MAX   3800
+#  endif  /*EVDEV_SCALE*/
+#endif  /*USE_EVDEV*/
+
+/*-------------------------------
+ *   Keyboard of a PC (using SDL)
+ *------------------------------*/
+#ifndef USE_KEYBOARD
+#  define USE_KEYBOARD        1
+#endif
+
+#if USE_KEYBOARD
+/*No settings*/
+#endif
+
+#endif  /*LV_DRV_CONF_H*/
+
+#endif /*End of "Content enable"*/

samples/simple/wasm-apps/gui.c

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include <stdlib.h>
+#include <unistd.h>
+#include "wasm_app.h"
+
+static void btn_event_cb(wgl_obj_t btn, wgl_event_t event);
+
+uint32_t count = 0;
+char count_str[11] = { 0 };
+wgl_obj_t hello_world_label;
+wgl_obj_t count_label;
+wgl_obj_t btn1;
+wgl_obj_t label_count1;
+int label_count1_value = 0;
+char label_count1_str[11] = { 0 };
+
+void timer1_update(user_timer_t timer1)
+{
+    if ((count % 100) == 0) {
+        sprintf(count_str, "%d", count / 100);
+        wgl_label_set_text(count_label, count_str);
+    }
+    ++count;
+}
+
+void on_init()
+{
+    char text[32] = {0};
+
+    hello_world_label = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_label_set_text(hello_world_label, "Hello world!");
+    wgl_label_get_text(hello_world_label, text, sizeof(text));
+    printf("Label text %d %s \n", wgl_label_get_text_length(hello_world_label), text);
+    wgl_obj_align(hello_world_label, (wgl_obj_t)NULL, WGL_ALIGN_IN_TOP_LEFT, 0, 0);
+
+    count_label = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_obj_align(count_label, (wgl_obj_t)NULL, WGL_ALIGN_IN_TOP_MID, 0, 0);
+
+    btn1 = wgl_btn_create((wgl_obj_t)NULL, (wgl_obj_t)NULL); /*Create a button on the currently loaded screen*/
+    wgl_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
+    wgl_obj_align(btn1, (wgl_obj_t)NULL, WGL_ALIGN_CENTER, 0, 0); /*Align below the label*/
+
+    /*Create a label on the button*/
+    wgl_obj_t btn_label = wgl_label_create(btn1, (wgl_obj_t)NULL);
+    wgl_label_set_text(btn_label, "Click ++");
+
+    label_count1 = wgl_label_create((wgl_obj_t)NULL, (wgl_obj_t)NULL);
+    wgl_label_set_text(label_count1, "0");
+    wgl_obj_align(label_count1, (wgl_obj_t)NULL, WGL_ALIGN_IN_BOTTOM_MID, 0, 0);
+
+    /* set up a timer */
+    user_timer_t timer;
+    timer = api_timer_create(10, true, false, timer1_update);
+    api_timer_restart(timer, 10);
+}
+
+static void btn_event_cb(wgl_obj_t btn, wgl_event_t event)
+{
+    if(event == WGL_EVENT_RELEASED) {
+        label_count1_value++;
+        sprintf(label_count1_str, "%d", label_count1_value);
+        wgl_label_set_text(label_count1, label_count1_str);
+    }
+}

samples/simple/wasm-apps/gui_lvgl_compatible.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include "wasm_app.h"
+#include "lvgl.h"
+
+extern char g_widget_text[];
+
+static void btn_event_cb(lv_obj_t *btn, lv_event_t event);
+
+uint32_t count = 0;
+char count_str[11] = { 0 };
+lv_obj_t *hello_world_label;
+lv_obj_t *count_label;
+lv_obj_t *btn1;
+lv_obj_t *label_count1;
+int label_count1_value = 0;
+char label_count1_str[11] = { 0 };
+
+void timer1_update(user_timer_t timer1)
+{
+    if ((count % 100) == 0) {
+        sprintf(count_str, "%d", count / 100);
+        lv_label_set_text(count_label, count_str);
+    }
+    ++count;
+}
+
+void on_init()
+{
+    char *text;
+
+    hello_world_label = lv_label_create(NULL, NULL);
+    lv_label_set_text(hello_world_label, "Hello world!");
+    text = lv_label_get_text(hello_world_label);
+    printf("Label text %lu %s \n", strlen(text), text);
+    lv_obj_align(hello_world_label, NULL, LV_ALIGN_IN_TOP_LEFT, 0, 0);
+
+    count_label = lv_label_create(NULL, NULL);
+    lv_obj_align(count_label, NULL, LV_ALIGN_IN_TOP_MID, 0, 0);
+
+    btn1 = lv_btn_create(NULL, NULL); /*Create a button on the currently loaded screen*/
+    lv_obj_set_event_cb(btn1, btn_event_cb); /*Set function to be called when the button is released*/
+    lv_obj_align(btn1, NULL, LV_ALIGN_CENTER, 0, 0); /*Align below the label*/
+
+    /*Create a label on the button*/
+    lv_obj_t *btn_label = lv_label_create(btn1, NULL);
+    lv_label_set_text(btn_label, "Click ++");
+
+    label_count1 = lv_label_create(NULL, NULL);
+    lv_label_set_text(label_count1, "0");
+    lv_obj_align(label_count1, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
+
+    /* set up a timer */
+    user_timer_t timer;
+    timer = api_timer_create(10, true, false, timer1_update);
+    api_timer_restart(timer, 10);
+}
+
+static void btn_event_cb(lv_obj_t *btn, lv_event_t event)
+{
+    if(event == LV_EVENT_RELEASED) {
+        label_count1_value++;
+        sprintf(label_count1_str, "%d", label_count1_value);
+        lv_label_set_text(label_count1, label_count1_str);
+    }
+}