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
  12 class SkCanvas;
  13
  14 namespace cc {
  15
  16 class LayerPainter;
  17 class RenderingStatsInstrumenation;
  18
  19 // This class rasterizes the content_rect into a skia bitmap canvas. It then
  20 // updates textures by copying from the canvas into the texture, using
  21 // MapSubImage if possible.
  22 class CC_EXPORT BitmapContentLayerUpdater : public ContentLayerUpdater {
  23  public:
  24   class Resource : public LayerUpdater::Resource {
  25    public:
  26     Resource(BitmapContentLayerUpdater* updater,
  27              scoped_ptr<PrioritizedResource> resource);
  28     virtual ~Resource();
  29
  30     virtual void Update(ResourceUpdateQueue* queue,
  31                         gfx::Rect source_rect,
  32                         gfx::Vector2d dest_offset,
  33                         bool partial_update) OVERRIDE;
  34
  35    private:
  36     BitmapContentLayerUpdater* updater_;
  37
  38     DISALLOW_COPY_AND_ASSIGN(Resource);
  39   };
  40
  41   static scoped_refptr<BitmapContentLayerUpdater> Create(
  42       scoped_ptr<LayerPainter> painter,
  43       RenderingStatsInstrumentation* stats_instrumenation,
  44       int layer_id);
  45
  46   virtual scoped_ptr<LayerUpdater::Resource> CreateResource(
  47       PrioritizedResourceManager* manager) OVERRIDE;
  48   virtual void PrepareToUpdate(gfx::Rect content_rect,
  49                                gfx::Size tile_size,
  50                                float contents_width_scale,
  51                                float contents_height_scale,
  52                                gfx::Rect* resulting_opaque_rect) OVERRIDE;
  53   void UpdateTexture(ResourceUpdateQueue* queue,
  54                      PrioritizedResource* resource,
  55                      gfx::Rect source_rect,
  56                      gfx::Vector2d dest_offset,
  57                      bool partial_update);
  58   virtual void SetOpaque(bool opaque) OVERRIDE;
  59   virtual void ReduceMemoryUsage() OVERRIDE;
  60
  61  protected:
  62   BitmapContentLayerUpdater(
  63       scoped_ptr<LayerPainter> painter,
  64       RenderingStatsInstrumentation* stats_instrumenation,
  65       int layer_id);
  66   virtual ~BitmapContentLayerUpdater();
  67
  68   skia::RefPtr<SkCanvas> canvas_;
  69   gfx::Size canvas_size_;
  70   bool opaque_;
  71
  72  private:
  73   DISALLOW_COPY_AND_ASSIGN(BitmapContentLayerUpdater);
  74 };
  75
  76 }  // namespace cc
  77
  78 #endif  // CC_RESOURCES_BITMAP_CONTENT_LAYER_UPDATER_H_