Make filters use SkImage instead of SkBitmap

include/core/SkDevice.h

 /*
  * Copyright 2010 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 SkDevice_DEFINED
 #define SkDevice_DEFINED
 
@@ skipping 256 matching lines @@
      *  Override and return true for filters that the device can handle
      *  intrinsically. Doing so means that SkCanvas will pass-through this
      *  filter to drawSprite and drawDevice (and potentially filterImage).
      *  Returning false means the SkCanvas will have apply the filter itself,
      *  and just pass the resulting image to the device.
      */
     virtual bool canHandleImageFilter(const SkImageFilter*) { return false; }
 
     /**
      *  Related (but not required) to canHandleImageFilter, this method returns
-     *  true if the device could apply the filter to the src bitmap and return
+     *  true if the device could apply the filter to the src image and return
      *  the result (and updates offset as needed).
      *  If the device does not recognize or support this filter,
      *  it just returns false and leaves result and offset unchanged.
      */
-    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+    virtual bool filterImage(const SkImageFilter*, const SkImage*,
                              const SkImageFilter::Context&,
-                             SkBitmap* /*result*/, SkIPoint* /*offset*/) {
+                             SkAutoTUnref<const SkImage>& /*result*/, SkIPoint* /*offset*/) {
         return false;
     }
 
 protected:
     // default impl returns NULL
     virtual SkSurface* newSurface(const SkImageInfo&, const SkSurfaceProps&);
 
     // default impl returns NULL
     virtual const void* peekPixels(SkImageInfo*, size_t* rowBytes);
 
@@ skipping 69 matching lines @@
 private:
     friend class SkCanvas;
     friend struct DeviceCM; //for setMatrixClip
     friend class SkDraw;
     friend class SkDrawIter;
     friend class SkDeviceFilteredPaint;
     friend class SkDeviceImageFilterProxy;
     friend class SkDeferredDevice;    // for newSurface
     friend class SkNoPixelsBitmapDevice;
 
+    friend class SkSurface;
+    friend class SkSurface_Gpu;
     friend class SkSurface_Raster;
 
     // used to change the backend's pixels (and possibly config/rowbytes)
     // but cannot change the width/height, so there should be no change to
     // any clip information.
     // TODO: move to SkBitmapDevice
     virtual void replaceBitmapBackend(const SkBitmap&) {}
 
     virtual bool forceConservativeRasterClip() const { return false; }
 
@@ skipping 11 matching lines @@
     SkDeviceProperties* fLeakyProperties;   // will always exist.
 
 #ifdef SK_DEBUG
     bool        fAttachedToCanvas;
 #endif
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif