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      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 #ifndef CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_
      6 #define CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_
      7 
      8 #include "cc/base/cc_export.h"
      9 #include "cc/resources/content_layer_updater.h"
     10 #include "skia/ext/refptr.h"
     11 #include "third_party/skia/include/core/SkBitmap.h"
     12 
     13 class SkCanvas;
     14 
     15 namespace cc {
     16 
     17 class LayerPainter;
     18 class RenderingStatsInstrumenation;
     19 
     20 // This class rasterizes the content_rect into a skia bitmap canvas. It then
     21 // creates a ResourceUpdate with this bitmap canvas and inserts the
     22 // ResourceBundle to the provided ResourceUpdateQueue. Actual texture uploading
     23 // is done by ResourceUpdateController.
     24 class CC_EXPORT BitmapContentLayerUpdater : public ContentLayerUpdater {
     25  public:
     26   class Resource : public LayerUpdater::Resource {
     27    public:
     28     Resource(BitmapContentLayerUpdater* updater,
     29              scoped_ptr<PrioritizedResource> resource);
     30     virtual ~Resource();
     31 
     32     virtual void Update(ResourceUpdateQueue* queue,
     33                         const gfx::Rect& source_rect,
     34                         const gfx::Vector2d& dest_offset,
     35                         bool partial_update) OVERRIDE;
     36 
     37    private:
     38     BitmapContentLayerUpdater* updater_;
     39 
     40     DISALLOW_COPY_AND_ASSIGN(Resource);
     41   };
     42 
     43   static scoped_refptr<BitmapContentLayerUpdater> Create(
     44       scoped_ptr<LayerPainter> painter,
     45       RenderingStatsInstrumentation* stats_instrumenation,
     46       int layer_id);
     47 
     48   virtual scoped_ptr<LayerUpdater::Resource> CreateResource(
     49       PrioritizedResourceManager* manager) OVERRIDE;
     50   virtual void PrepareToUpdate(const gfx::Size& content_size,
     51                                const gfx::Rect& paint_rect,
     52                                const gfx::Size& tile_size,
     53                                float contents_width_scale,
     54                                float contents_height_scale) OVERRIDE;
     55   void UpdateTexture(ResourceUpdateQueue* queue,
     56                      PrioritizedResource* resource,
     57                      const gfx::Rect& source_rect,
     58                      const gfx::Vector2d& dest_offset,
     59                      bool partial_update);
     60   virtual void SetOpaque(bool opaque) OVERRIDE;
     61   virtual void ReduceMemoryUsage() OVERRIDE;
     62 
     63  protected:
     64   BitmapContentLayerUpdater(
     65       scoped_ptr<LayerPainter> painter,
     66       RenderingStatsInstrumentation* stats_instrumenation,
     67       int layer_id);
     68   virtual ~BitmapContentLayerUpdater();
     69 
     70   SkBitmap bitmap_backing_;
     71   skia::RefPtr<SkCanvas> canvas_;
     72   gfx::Size canvas_size_;
     73 
     74  private:
     75   DISALLOW_COPY_AND_ASSIGN(BitmapContentLayerUpdater);
     76 };
     77 
     78 }  // namespace cc
     79 
     80 #endif  // CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_
     81