Revert "Revert "speed up A8 by creating a new entry-point in SkDraw that blits the path's coverage …

src/core/SkCoreBlitters.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCoreBlitters_DEFINED
 #define SkCoreBlitters_DEFINED
 
@@ skipping 22 matching lines @@
 
 private:
     // illegal
     SkShaderBlitter& operator=(const SkShaderBlitter&);
 
     typedef SkRasterBlitter INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
+class SkA8_Coverage_Blitter : public SkRasterBlitter {
+public:
+    SkA8_Coverage_Blitter(const SkBitmap& device, const SkPaint& paint);
+    virtual void blitH(int x, int y, int width) SK_OVERRIDE;
+    virtual void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]) SK_OVERRIDE;
+    virtual void blitV(int x, int y, int height, SkAlpha alpha) SK_OVERRIDE;
+    virtual void blitRect(int x, int y, int width, int height) SK_OVERRIDE;
+    virtual void blitMask(const SkMask&, const SkIRect&) SK_OVERRIDE;
+    virtual const SkBitmap* justAnOpaqueColor(uint32_t*) SK_OVERRIDE;
+};
+
 class SkA8_Blitter : public SkRasterBlitter {
 public:
     SkA8_Blitter(const SkBitmap& device, const SkPaint& paint);
     virtual void blitH(int x, int y, int width);
     virtual void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]);
     virtual void blitV(int x, int y, int height, SkAlpha alpha);
     virtual void blitRect(int x, int y, int width, int height);
     virtual void blitMask(const SkMask&, const SkIRect&);
     virtual const SkBitmap* justAnOpaqueColor(uint32_t*);
 
@@ skipping 125 matching lines @@
 
     These pre-conditions must be handled by the caller, in our case
     SkBlitter::Choose(...)
  */
 
 extern SkBlitter* SkBlitter_ChooseD565(const SkBitmap& device,
                                        const SkPaint& paint,
                                        void* storage, size_t storageSize);
 
 #endif