Merge 107822 - Source/WebCore: Fix for incorrect/offset image in CSS filters (non-composited path)

Source/WebCore/rendering/FilterEffectRenderer.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 308 matching lines @@
 void FilterEffectRenderer::prepare()
 {
     // At this point the effect chain has been built, and the
     // source image sizes set. We just need to attach the graphic
     // buffer if we have not yet done so.
     if (!m_graphicsBufferAttached) {
         setSourceImage(ImageBuffer::create(IntSize(m_sourceDrawingRegion.width(), m_sourceDrawingRegion.height()), ColorSpaceDeviceRGB, renderingMode()));
         m_graphicsBufferAttached = true;
     }
     m_sourceGraphic->clearResult();
-    lastEffect()->clearResult();
+    for (size_t i = 0; i < m_effects.size(); ++i)
+        m_effects[i]->clearResult();
 }
 
 void FilterEffectRenderer::apply()
 {
     lastEffect()->apply();
 }
 
 
 GraphicsContext* FilterEffectRendererHelper::beginFilterEffect(RenderLayer* renderLayer, GraphicsContext* oldContext, const LayoutRect& filterRect)
 {
@@ skipping 37 matching lines @@
     destRect.move(m_paintOffset.x(), m_paintOffset.y());
     
     m_savedGraphicsContext->drawImageBuffer(filter->output(), m_renderLayer->renderer()->style()->colorSpace(), destRect, CompositeSourceOver);
     
     return m_savedGraphicsContext;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(CSS_FILTERS)