Implement filter primitive subregion for reference CSS filters. This required refactoring determin…

Source/core/rendering/FilterEffectRenderer.h

Index: Source/core/rendering/FilterEffectRenderer.h
diff --git a/Source/core/rendering/FilterEffectRenderer.h b/Source/core/rendering/FilterEffectRenderer.h
index 89bfdee33a5f5f46ed9e583dc9e2c41d0dae79a4..eb80830804a25c222a7f03e4b1337b01af3c5f72 100644
--- a/Source/core/rendering/FilterEffectRenderer.h
+++ b/Source/core/rendering/FilterEffectRenderer.h
@@ -71,7 +71,7 @@ public:
 private:
     GraphicsContext* m_savedGraphicsContext;
     RenderLayer* m_renderLayer;
-    LayoutPoint m_paintOffset;
+
     LayoutRect m_repaintRect;
     bool m_haveFilterEffect;
 };
@@ -85,18 +85,13 @@ public:
         return adoptRef(new FilterEffectRenderer());
     }
 
-    virtual void setSourceImageRect(const FloatRect& sourceImageRect)
+    void setSourceImageRect(const FloatRect& sourceImageRect)
     { 
         m_sourceDrawingRegion = sourceImageRect;
-        setMaxEffectRects(sourceImageRect);
-        setFilterRegion(sourceImageRect);
         m_graphicsBufferAttached = false;
     }
     virtual FloatRect sourceImageRect() const { return m_sourceDrawingRegion; }
 
-    virtual void setFilterRegion(const FloatRect& filterRegion) { m_filterRegion = filterRegion; }
-    virtual FloatRect filterRegion() const { return m_filterRegion; }
-
     GraphicsContext* inputContext();
     ImageBuffer* output() const { return lastEffect()->asImageBuffer(); }
 
@@ -107,32 +102,24 @@ public:
     void clearIntermediateResults();
     void apply();
     
-    IntRect outputRect() const { return lastEffect()->hasResult() ? lastEffect()->requestedRegionOfInputImageData(IntRect(m_filterRegion)) : IntRect(); }
+    IntRect outputRect() const { return lastEffect()->hasResult() ? lastEffect()->absolutePaintRect() : IntRect(); }
 
     bool hasFilterThatMovesPixels() const { return m_hasFilterThatMovesPixels; }
     LayoutRect computeSourceImageRectForDirtyRect(const LayoutRect& filterBoxRect, const LayoutRect& dirtyRect);
 
     bool hasCustomShaderFilter() const { return m_hasCustomShaderFilter; }
-private:
-    void setMaxEffectRects(const FloatRect& effectRect)
-    {
-        for (size_t i = 0; i < m_effects.size(); ++i) {
-            RefPtr<FilterEffect> effect = m_effects.at(i);
-            effect->setMaxEffectRect(effectRect);
-        }
-    }
     PassRefPtr<FilterEffect> lastEffect() const
     {
         if (m_effects.size() > 0)
             return m_effects.last();
         return 0;
     }
+private:
 
     FilterEffectRenderer();
     virtual ~FilterEffectRenderer();
     
     FloatRect m_sourceDrawingRegion;
-    FloatRect m_filterRegion;
     
     FilterEffectList m_effects;
     RefPtr<SourceGraphic> m_sourceGraphic;