cc/skpicture_content_layer_updater.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 CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_
   7 #define CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_
   8
   9 #include "cc/content_layer_updater.h"
  10 #include "third_party/skia/include/core/SkPicture.h"
  11
  12 class SkCanvas;
  13
  14 namespace cc {
  15
  16 class LayerPainter;
  17
  18 // This class records the contentRect into an SkPicture. Subclasses, provide
  19 // different implementations of tile updating based on this recorded picture.
  20 // The BitmapSkPictureContentLayerUpdater and
  21 // FrameBufferSkPictureContentLayerUpdater are two examples of such
  22 // implementations.
  23 class SkPictureContentLayerUpdater : public ContentLayerUpdater {
  24 public:
  25     class Resource : public LayerUpdater::Resource {
  26     public:
  27         Resource(SkPictureContentLayerUpdater*, scoped_ptr<PrioritizedResource>);
  28         virtual ~Resource();
  29
  30         virtual void update(ResourceUpdateQueue&, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate, RenderingStats&) OVERRIDE;
  31
  32     private:
  33         SkPictureContentLayerUpdater* updater() { return m_updater; }
  34
  35         SkPictureContentLayerUpdater* m_updater;
  36     };
  37
  38     static scoped_refptr<SkPictureContentLayerUpdater> create(scoped_ptr<LayerPainter>);
  39
  40     virtual scoped_ptr<LayerUpdater::Resource> createResource(PrioritizedResourceManager*) OVERRIDE;
  41     virtual void setOpaque(bool) OVERRIDE;
  42
  43 protected:
  44     explicit SkPictureContentLayerUpdater(scoped_ptr<LayerPainter>);
  45     virtual ~SkPictureContentLayerUpdater();
  46
  47     virtual void prepareToUpdate(const gfx::Rect& contentRect, const gfx::Size& tileSize, float contentsWidthScale, float contentsHeightScale, gfx::Rect& resultingOpaqueRect, RenderingStats&) OVERRIDE;
  48     void drawPicture(SkCanvas*);
  49     void updateTexture(ResourceUpdateQueue& queue, PrioritizedResource* texture, const gfx::Rect& sourceRect, const gfx::Vector2d& destOffset, bool partialUpdate);
  50
  51     bool layerIsOpaque() const { return m_layerIsOpaque; }
  52
  53 private:
  54     // Recording canvas.
  55     SkPicture m_picture;
  56     // True when it is known that all output pixels will be opaque.
  57     bool m_layerIsOpaque;
  58 };
  59
  60 } // namespace cc
  61 #endif  // CC_SKPICTURE_CONTENT_LAYER_UPDATER_H_