Fixed Shadow blur for transparent objects

Source/platform/graphics/GraphicsContext.h

Index: Source/platform/graphics/GraphicsContext.h
diff --git a/Source/platform/graphics/GraphicsContext.h b/Source/platform/graphics/GraphicsContext.h
index f3e837ba9e9bab5ed9918c0b6b6f68a24ee9733a..d941cc24cf22793b46ca3ff187fad9cae96dd92c 100644
--- a/Source/platform/graphics/GraphicsContext.h
+++ b/Source/platform/graphics/GraphicsContext.h
@@ -136,6 +136,8 @@ public:
 
     SkDrawLooper* drawLooper() const { return immutableState()->drawLooper(); }
 
+    SkImageFilter* imageFilter() const { return immutableState()->imageFilter(); }
+
     bool getTransformedClipBounds(FloatRect* bounds) const;
     SkMatrix getTotalMatrix() const;
 
@@ -350,6 +352,11 @@ public:
     void setDrawLooper(PassOwnPtr<DrawLooperBuilder>);
     void clearDrawLooper();
 
+    // It is assumed that this image filter is used only for shadows
+    // (i.e. an image filter is set if and only if there is a shadow).
+    void setImageFilter(PassRefPtr<SkImageFilter>);

[Stephen White, 2014/10/23 01:45:47]

Make these private?

[Justin Novosad, 2014/10/23 02:29:21]

Yes, and while you are at it, make the drawLooper methods above private. We
don't want external code to call these directly because it would conflict with
the state that is set by setShadow.

[sugoi1, 2014/10/23 17:43:17]

Can't, they're also use for text shadows.

[sugoi1, 2014/10/23 17:43:17]

Done.

+    void clearImageFilter();
+
     void drawFocusRing(const Vector<IntRect>&, int width, int offset, const Color&);
     void drawFocusRing(const Path&, int width, int offset, const Color&);
 
@@ -401,6 +408,7 @@ public:
         const SkRect& destRect,
         CompositeOperator,
         WebBlendMode,
+        bool isOpaque,
         bool isLazyDecoded = false,
         bool isDataComplete = true) const;