src/cc/resources/bitmap_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 #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::Rect& content_rect,
  51                                const gfx::Size& tile_size,
  52                                float contents_width_scale,
  53                                float contents_height_scale,
  54                                gfx::Rect* resulting_opaque_rect) 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   bool opaque_;
  74
  75  private:
  76   DISALLOW_COPY_AND_ASSIGN(BitmapContentLayerUpdater);
  77 };
  78
  79 }  // namespace cc
  80
  81 #endif  // CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_