rtgui_image_engine中添加9.png类型

Signed-off-by: Sunxin <sunxin@rt-thread.com>

src/image.c

@@ -1,4 +1,4 @@
-/*
+/*
  * File      : image.c
  * This file is part of RT-Thread GUI Engine
  * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
@@ -111,6 +111,10 @@ struct rtgui_image_engine *rtgui_image_get_engine_by_filename(const char *fn)
         if (*ext == '.')
         {
             ext ++;
+			if (*(ext - 3) == '.')
+			{
+				ext -= 2;
+			}
             break;
         }
         ext --;

src/image_png.c

@@ -1,4 +1,4 @@
-/*
+/*
  * File      : image_png.c
  * This file is part of RT-Thread GUI Engine
  * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
@@ -441,6 +441,16 @@ struct rtgui_image_engine rtgui_image_png_engine =
     rtgui_image_png_blit,
 };
 
+struct rtgui_image_engine rtgui_image_9png_engine =
+{
+	"9.png",
+	{ RT_NULL },
+	rtgui_image_png_check,
+	rtgui_image_png_load,
+	rtgui_image_png_unload,
+	rtgui_image_png_blit,
+};
+
 static rt_bool_t rtgui_image_png_check(struct rtgui_filerw *file)
 {
     int start;
@@ -713,5 +723,6 @@ void rtgui_image_png_init()
 {
     /* register png on image system */
     rtgui_image_register_engine(&rtgui_image_png_engine);
+	rtgui_image_register_engine(&rtgui_image_9png_engine);
 }
 #endif