impl getROPixels for gpu SkImage

src/image/SkImage_Gpu.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 "SkImagePriv.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "GrContext.h"
 #include "GrTexture.h"
 #include "SkGrPixelRef.h"
 
 class SkImage_Gpu : public SkImage_Base {
 public:
     SK_DECLARE_INST_COUNT(SkImage_Gpu)
 
     explicit SkImage_Gpu(const SkBitmap&);
     virtual ~SkImage_Gpu();
 
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) SK_OVERRIDE;
     virtual void onDrawRectToRect(SkCanvas*, const SkRect* src, const SkRect& dst, const SkPaint*) SK_OVERRIDE;
     virtual GrTexture* onGetTexture() SK_OVERRIDE;
-    virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE {
-        // TODO
-        return false;
-    }
+    virtual bool getROPixels(SkBitmap*) const SK_OVERRIDE;
 
     GrTexture* getTexture() { return fBitmap.getTexture(); }
 
 private:
     SkBitmap    fBitmap;
 
     typedef SkImage_Base INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 14 matching lines @@
 
 void SkImage_Gpu::onDrawRectToRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
                          const SkPaint* paint) {
     canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
 }
 
 GrTexture* SkImage_Gpu::onGetTexture() {
     return fBitmap.getTexture();
 }
 
+bool SkImage_Gpu::getROPixels(SkBitmap* dst) const {
+    return fBitmap.copyTo(dst, SkBitmap::kARGB_8888_Config);
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 SkImage* SkImage::NewTexture(const SkBitmap& bitmap) {
     if (NULL == bitmap.getTexture()) {
         return NULL;
     }
 
     return SkNEW_ARGS(SkImage_Gpu, (bitmap));
 }
 
 GrTexture* SkTextureImageGetTexture(SkImage* image) {
     return ((SkImage_Gpu*)image)->getTexture();
 }