Make filters use SkImage instead of SkBitmap

src/image/SkImage_Raster.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage_Base.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
@@ skipping 53 matching lines @@
     SkImage_Raster(const SkImageInfo&, SkPixelRef*, const SkIPoint& pixelRefOrigin, size_t rowBytes,
                    const SkSurfaceProps*);
 
     SkPixelRef* getPixelRef() const { return fBitmap.pixelRef(); }
 
     virtual SkShader* onNewShader(SkShader::TileMode,
                                   SkShader::TileMode,
                                   const SkMatrix* localMatrix) const SK_OVERRIDE;
 
     bool isOpaque() const SK_OVERRIDE;
+    size_t getSize() const SK_OVERRIDE { return fBitmap.getSize(); }
 
     SkImage_Raster(const SkBitmap& bm, const SkSurfaceProps* props)
         : INHERITED(bm.width(), bm.height(), props)
         , fBitmap(bm) {}
 
 private:
     SkImage_Raster() : INHERITED(0, 0, NULL) {}
 
     SkBitmap    fBitmap;
 
@@ skipping 144 matching lines @@
 }
 
 const SkPixelRef* SkBitmapImageGetPixelRef(const SkImage* image) {
     return ((const SkImage_Raster*)image)->getPixelRef();
 }
 
 bool SkImage_Raster::isOpaque() const {
     return fBitmap.isOpaque();
 }