Added a test to check the read/write pixels API

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404306

test/automated/common/common.c

@@ -82,7 +82,6 @@ int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img, int allowable_
 
       bpp = sur->format->BytesPerPixel;
 
-      /* Compare image - should be same format. */
       if (bpp == 4) {
          for (j=0; j<sur->h; j++) {
             for (i=0; i<sur->w; i++) {

test/automated/render/render.c

@@ -37,6 +37,7 @@ static int render_hasTexColor (void);
 static int render_hasTexAlpha (void);
 static int render_clearScreen (void);
 /* Testcases. */
+static int render_testReadWrite (void);
 static int render_testPrimitives (void);
 static int render_testPrimitivesBlend (void);
 static int render_testBlit (void);
@@ -362,6 +363,31 @@ static int render_clearScreen (void)
 }
 
 
+/**
+ * @brief Test reading and writing framebuffer
+ */
+static int render_testReadWrite (void)
+{
+   int ret;
+   SDL_Rect rect;
+
+   /* Write pixels. */
+   rect.x = 0;
+   rect.y = 0;
+   rect.w = 80;
+   rect.h = 60;
+   ret = SDL_RenderWritePixels( &rect, SDL_PIXELFORMAT_RGB24, img_primitives.pixel_data, img_primitives.width*img_primitives.bytes_per_pixel );
+   if (SDL_ATassert( "SDL_RenderWritePixels", ret==0) )
+      return 1;
+
+   /* See if it's the same. */
+   if (render_compare( "Read/write output not the same.", &img_primitives, ALLOWABLE_ERROR_OPAQUE ))
+      return -1;
+
+   return 0;
+}
+
+
 /**
  * @brief Tests the SDL primitives for rendering.
  */
@@ -932,6 +958,9 @@ int render_runTests (void)
       SDL_ATprintVerbose( 1, "      Texture Alpha Mod supported\n" );
 
    /* Software surface blitting. */
+   ret = render_testReadWrite();
+   if (ret)
+      return -1;
    ret = render_testPrimitives();
    if (ret)
       return -1;