[[ GraphicsPerformance ]] Fix gcontext invalidation when drawing effect with a zero-sized clip

livecodeian · livecodeian · commit b58fbf697d38 · 2014-06-24T15:03:04.000+01:00
diff --git a/libgraphics/src/context.cpp b/libgraphics/src/context.cpp
@@ -755,6 +755,13 @@ void MCGContextBeginWithEffects(MCGContextRef self, MCGRectangle p_shape, const
 
 	t_layer_clip = MCGIRectangleIntersect(t_layer_clip, t_device_shape);
 
+	// IM-2014-06-24: [[ GraphicsPerformance ]] If the clip is empty then don't try to create a new layer
+	if ((t_layer_clip.left >= t_layer_clip.right) || (t_layer_clip.top >= t_layer_clip.bottom))
+	{
+		self -> layer -> nesting += 1;
+		return;
+	}
+	
 	// Create a suitable bitmap.
 	SkBitmap t_new_bitmap;
 	t_new_bitmap . setConfig(SkBitmap::kARGB_8888_Config, t_layer_clip . right - t_layer_clip . left, t_layer_clip . bottom - t_layer_clip . top);
