cc/SkPictureCanvasLayerTextureUpdater.h

   1 // Copyright 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5
   6 #ifndef SkPictureCanvasLayerTextureUpdater_h
   7 #define SkPictureCanvasLayerTextureUpdater_h
   8
   9 #if USE(ACCELERATED_COMPOSITING)
  10
  11 #include "CanvasLayerTextureUpdater.h"
  12 #include "SkPicture.h"
  13
  14 class SkCanvas;
  15
  16 namespace WebCore {
  17
  18 class LayerPainterChromium;
  19
  20 // This class records the contentRect into an SkPicture. Subclasses, provide
  21 // different implementations of tile updating based on this recorded picture.
  22 // The BitmapSkPictureCanvasLayerTextureUpdater and
  23 // FrameBufferSkPictureCanvasLayerTextureUpdater are two examples of such
  24 // implementations.
  25 class SkPictureCanvasLayerTextureUpdater : public CanvasLayerTextureUpdater {
  26 public:
  27     virtual ~SkPictureCanvasLayerTextureUpdater();
  28
  29     virtual void setOpaque(bool) OVERRIDE;
  30
  31 protected:
  32     explicit SkPictureCanvasLayerTextureUpdater(PassOwnPtr<LayerPainterChromium>);
  33
  34     virtual void prepareToUpdate(const IntRect& contentRect, const IntSize& tileSize, float contentsWidthScale, float contentsHeightScale, IntRect& resultingOpaqueRect, CCRenderingStats&) OVERRIDE;
  35     void drawPicture(SkCanvas*);
  36
  37     bool layerIsOpaque() const { return m_layerIsOpaque; }
  38
  39 private:
  40     // Recording canvas.
  41     SkPicture m_picture;
  42     // True when it is known that all output pixels will be opaque.
  43     bool m_layerIsOpaque;
  44 };
  45
  46 } // namespace WebCore
  47 #endif // USE(ACCELERATED_COMPOSITING)
  48 #endif // SkPictureCanvasLayerTextureUpdater_h