Fixed Shadow blur for transparent objects

Source/platform/graphics/GraphicsContextState.h

 // 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:
 //
 //    * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //    * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 18 matching lines @@
 #ifndef GraphicsContextState_h
 #define GraphicsContextState_h
 
 #include "platform/graphics/DrawLooperBuilder.h"
 #include "platform/graphics/Gradient.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/graphics/Path.h"
 #include "platform/graphics/Pattern.h"
 #include "platform/graphics/StrokeData.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
 #include "third_party/skia/include/core/SkPaint.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 // Encapsulates the state information we store for each pushed graphics state.
 // Only GraphicsContext can use this class.
 class PLATFORM_EXPORT GraphicsContextState final {
 public:
@@ skipping 54 matching lines @@
 
     // Path fill rule
     WindRule fillRule() const { return m_fillRule; }
     void setFillRule(WindRule rule) { m_fillRule = rule; }
 
     // Shadow. (This will need tweaking if we use draw loopers for other things.)
     SkDrawLooper* drawLooper() const { return m_looper.get(); }
     void setDrawLooper(PassRefPtr<SkDrawLooper>);
     void clearDrawLooper();
 
+    SkImageFilter* dropShadowImageFilter() const { return m_dropShadowImageFilter.get(); }
+    void setDropShadowImageFilter(PassRefPtr<SkImageFilter>);
+    void clearDropShadowImageFilter();
+
     // Text. (See TextModeFill & friends.)
     TextDrawingModeFlags textDrawingMode() const { return m_textDrawingMode; }
     void setTextDrawingMode(TextDrawingModeFlags mode) { m_textDrawingMode = mode; }
 
     // Common shader state.
     int alpha() const { return m_alpha; }
     void setAlphaAsFloat(float);
 
     SkColorFilter* colorFilter() const { return m_colorFilter.get(); }
     void setColorFilter(PassRefPtr<SkColorFilter>);
@@ skipping 35 matching lines @@
     Color m_strokeColor;
     RefPtr<Gradient> m_strokeGradient;
     RefPtr<Pattern> m_strokePattern;
 
     Color m_fillColor;
     WindRule m_fillRule;
     RefPtr<Gradient> m_fillGradient;
     RefPtr<Pattern> m_fillPattern;
 
     RefPtr<SkDrawLooper> m_looper;
+    RefPtr<SkImageFilter> m_dropShadowImageFilter;
 
     TextDrawingModeFlags m_textDrawingMode;
 
     int m_alpha;
     RefPtr<SkColorFilter> m_colorFilter;
 
     CompositeOperator m_compositeOperator;
     WebBlendMode m_blendMode;
 
     InterpolationQuality m_interpolationQuality;
 
     uint16_t m_saveCount;
 
     bool m_shouldAntialias : 1;
     bool m_shouldClampToSourceRect : 1;
 };
 
 } // namespace blink
 
 #endif // GraphicsContextState_h