[WIP] Add Context to SkDrawLooper.

include/effects/SkBlurDrawLooper.h

Index: include/effects/SkBlurDrawLooper.h
diff --git a/include/effects/SkBlurDrawLooper.h b/include/effects/SkBlurDrawLooper.h
index 46b154debcae1737acec841a576008b316725999..9b163fb1e1988a00f9fb7847b16682bdf1aca604 100644
--- a/include/effects/SkBlurDrawLooper.h
+++ b/include/effects/SkBlurDrawLooper.h
@@ -44,8 +44,7 @@ public:
     virtual ~SkBlurDrawLooper();
 
     // overrides from SkDrawLooper
-    virtual void init(SkCanvas*);
-    virtual bool next(SkCanvas*, SkPaint* paint);
+    virtual SkDrawLooper::DrawContext* init(SkCanvas*) const;

[scroggo, 2014/02/06 17:57:13]

SK_OVERRIDE

 
     SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
@@ -54,6 +53,10 @@ protected:
     SkBlurDrawLooper(SkReadBuffer&);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
+    virtual bool next_internal(

[scroggo, 2014/02/06 17:57:13]

SK_OVERRIDE

+        SkCanvas* canvas, SkPaint* paint,
+        SkDrawLooper::DrawContext* context) const;
+
 private:
     SkMaskFilter*   fBlur;
     SkColorFilter*  fColorFilter;
@@ -66,7 +69,11 @@ private:
         kAfterEdge,
         kDone
     };
-    State   fState;
+
+    struct SkBlurDrawLooperContext : public SkDrawLooper::DrawContext {
+        SkBlurDrawLooperContext();
+        State fState;
+    };
 
     void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags);