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