Debug info to help track down render test failures

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404182

test/automated/common/common.c

@@ -73,5 +73,37 @@ int surface_compare( SDL_Surface *sur, const SurfaceImage_t *img )
 
    SDL_UnlockSurface( sur );
 
+   if (ret) {
+      SDL_SaveBMP(sur, "fail.bmp");
+
+      SDL_LockSurface( sur );
+
+      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++) {
+               p  = (Uint8 *)sur->pixels + j * sur->pitch + i * bpp;
+               pd = (Uint8 *)img->pixel_data + (j*img->width + i) * img->bytes_per_pixel;
+               Uint8 R, G, B, A;
+
+               R = pd[0];
+               G = pd[1];
+               B = pd[2];
+               if (img->bytes_per_pixel == 4) {
+                  A = pd[3];
+               } else {
+                  A = 0;
+               }
+               *(Uint32*)p = (A << 24) | (R << 16) | (G << 8) | B;
+            }
+         }
+      }
+
+      SDL_UnlockSurface( sur );
+
+      SDL_SaveBMP(sur, "good.bmp");
+   }
    return ret;
 }

test/automated/render/render.c

@@ -67,6 +67,7 @@ static int render_compare( const char *msg, const SurfaceImage_t *s )
       return 1;
 
    /* Read pixels. */
+   SDL_RenderPresent();
    ret = SDL_RenderReadPixels( NULL, FORMAT, pix, 80*4 );
    if (SDL_ATassert( "SDL_RenderReadPixels", ret==0) )
       return 1;
@@ -1012,7 +1013,7 @@ int test_render (void)
          goto err;
       /* Create window. */
       wid = SDL_CreateWindow( msg, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
-            80, 60, 0 );
+            80, 60, SDL_WINDOW_SHOWN );
       if (SDL_ATassert( "SDL_CreateWindow", wid!=0 ))
          goto err;
       /* Check title. */