Fixed Shadow blur for transparent objects

Source/platform/graphics/GraphicsContext.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008-2009 Torch Mobile, Inc.
  * Copyright (C) 2013 Google 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.
@@ skipping 324 matching lines @@
     // Instead of being dispatched to the active canvas, draw commands following beginRecording()
     // are stored in a display list that can be replayed at a later time. Pass in the bounding
     // rectangle for the content in the list.
     void beginRecording(const FloatRect&, uint32_t = 0);
     PassRefPtr<DisplayList> endRecording();
 
     bool hasShadow() const;
     void setShadow(const FloatSize& offset, float blur, const Color&,
         DrawLooperBuilder::ShadowTransformMode = DrawLooperBuilder::ShadowRespectsTransforms,
         DrawLooperBuilder::ShadowAlphaMode = DrawLooperBuilder::ShadowRespectsAlpha, ShadowMode = DrawShadowAndForeground);
-    void clearShadow() { clearDrawLooper(); }
+    void clearShadow() { clearDrawLooper(); clearDropShadowImageFilter(); }
 
     // It is assumed that this draw looper is used only for shadows
     // (i.e. a draw looper is set if and only if there is a shadow).
     // The builder passed into this method will be destroyed.
     void setDrawLooper(PassOwnPtr<DrawLooperBuilder>);
     void clearDrawLooper();
 
     void drawFocusRing(const Vector<IntRect>&, int width, int offset, const Color&);
     void drawFocusRing(const Path&, int width, int offset, const Color&);
 
@@ skipping 38 matching lines @@
 
     void beginAnnotation(const AnnotationList&);
     void endAnnotation();
 
     void preparePaintForDrawRectToRect(
         SkPaint*,
         const SkRect& srcRect,
         const SkRect& destRect,
         CompositeOperator,
         WebBlendMode,
+        bool isBitmapWithAlpha,
         bool isLazyDecoded = false,
         bool isDataComplete = true) const;
 
     static int focusRingOutsetExtent(int offset, int width)
     {
         return focusRingOutset(offset) + (focusRingWidth(width) + 1) / 2;
     }
 
 private:
     const GraphicsContextState* immutableState() const { return m_paintState; }
@@ skipping 29 matching lines @@
     float prepareFocusRingPaint(SkPaint&, const Color&, int width) const;
     void drawFocusRingPath(const SkPath&, const Color&, int width);
     void drawFocusRingRect(const SkRect&, const Color&, int width);
 
     // SkCanvas wrappers.
     void clipPath(const SkPath&, AntiAliasingMode = NotAntiAliased, SkRegion::Op = SkRegion::kIntersect_Op);
     void clipRRect(const SkRRect&, AntiAliasingMode = NotAntiAliased, SkRegion::Op = SkRegion::kIntersect_Op);
     void concat(const SkMatrix&);
     void drawRRect(const SkRRect&, const SkPaint&);
 
+    void setDropShadowImageFilter(PassRefPtr<SkImageFilter>);
+    void clearDropShadowImageFilter();
+    SkImageFilter* dropShadowImageFilter() const { return immutableState()->dropShadowImageFilter(); }
+
     // Apply deferred paint state saves
     void realizePaintSave()
     {
         if (contextDisabled())
             return;
 
         if (m_paintState->saveCount()) {
             m_paintState->decrementSaveCount();
             ++m_paintStateIndex;
             if (m_paintStateStack.size() == m_paintStateIndex) {
@@ skipping 52 matching lines @@
     bool m_accelerated : 1;
     bool m_isCertainlyOpaque : 1;
     bool m_printing : 1;
     bool m_antialiasHairlineImages : 1;
     bool m_shouldSmoothFonts : 1;
 };
 
 } // namespace blink
 
 #endif // GraphicsContext_h