Use blitframebuffer to implement copySurface.

src/gpu/gl/GrGpuGL.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef GrGpuGL_DEFINED
@@ skipping 67 matching lines @@
     }
     void notifyVertexBufferDelete(GrGLuint id) {
         fHWGeometryState.notifyVertexBufferDelete(id);
     }
     void notifyIndexBufferDelete(GrGLuint id) {
         fHWGeometryState.notifyIndexBufferDelete(id);
     }
     void notifyTextureDelete(GrGLTexture* texture);
     void notifyRenderTargetDelete(GrRenderTarget* renderTarget);
 
+protected:
+    virtual bool onCopySurface(GrSurface* dst,
+                               GrSurface* src,
+                               const SkIRect& srcRect,
+                               const SkIPoint& dstPoint) SK_OVERRIDE;
+
+    virtual bool onCanCopySurface(GrSurface* dst,
+                                  GrSurface* src,
+                                  const SkIRect& srcRect,
+                                  const SkIPoint& dstPoint) SK_OVERRIDE;
+
+
 private:
     // GrGpu overrides
     virtual void onResetContext() SK_OVERRIDE;
 
     virtual GrTexture* onCreateTexture(const GrTextureDesc& desc,
                                        const void* srcData,
                                        size_t rowBytes) SK_OVERRIDE;
     virtual GrVertexBuffer* onCreateVertexBuffer(uint32_t size,
                                                  bool dynamic) SK_OVERRIDE;
     virtual GrIndexBuffer* onCreateIndexBuffer(uint32_t size,
@@ skipping 327 matching lines @@
     ///@}
 
     // we record what stencil format worked last time to hopefully exit early
     // from our loop that tries stencil formats and calls check fb status.
     int fLastSuccessfulStencilFmtIdx;
 
     typedef GrGpu INHERITED;
 };
 
 #endif