content_layer.h revision 3551c9c881056c480085172ff9840cab31610854 
1// Copyright 2010 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_LAYERS_CONTENT_LAYER_H_
6#define CC_LAYERS_CONTENT_LAYER_H_
7
8#include "base/basictypes.h"
9#include "cc/base/cc_export.h"
10#include "cc/layers/tiled_layer.h"
11#include "cc/resources/layer_painter.h"
12
13class SkCanvas;
14
15namespace cc {
16
17class ContentLayerClient;
18class ContentLayerUpdater;
19
20class CC_EXPORT ContentLayerPainter : public LayerPainter {
21 public:
22  static scoped_ptr<ContentLayerPainter> Create(ContentLayerClient* client);
23
24  virtual void Paint(SkCanvas* canvas,
25                     gfx::Rect content_rect,
26                     gfx::RectF* opaque) OVERRIDE;
27
28 private:
29  explicit ContentLayerPainter(ContentLayerClient* client);
30
31  ContentLayerClient* client_;
32
33  DISALLOW_COPY_AND_ASSIGN(ContentLayerPainter);
34};
35
36// A layer that renders its contents into an SkCanvas.
37class CC_EXPORT ContentLayer : public TiledLayer {
38 public:
39  static scoped_refptr<ContentLayer> Create(ContentLayerClient* client);
40
41  void ClearClient() { client_ = NULL; }
42
43  virtual bool DrawsContent() const OVERRIDE;
44  virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
45  virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
46      OVERRIDE;
47  virtual bool Update(ResourceUpdateQueue* queue,
48                      const OcclusionTracker* occlusion) OVERRIDE;
49  virtual bool NeedMoreUpdates() OVERRIDE;
50
51  virtual void SetContentsOpaque(bool contents_opaque) OVERRIDE;
52
53  virtual bool SupportsLCDText() const OVERRIDE;
54
55  virtual skia::RefPtr<SkPicture> GetPicture() const OVERRIDE;
56
57 protected:
58  explicit ContentLayer(ContentLayerClient* client);
59  virtual ~ContentLayer();
60
61 private:
62  // TiledLayer implementation.
63  virtual LayerUpdater* Updater() const OVERRIDE;
64  virtual void CreateUpdaterIfNeeded() OVERRIDE;
65
66  void UpdateCanUseLCDText();
67
68  ContentLayerClient* client_;
69  scoped_refptr<ContentLayerUpdater> updater_;
70  bool can_use_lcd_text_last_frame_;
71
72  DISALLOW_COPY_AND_ASSIGN(ContentLayer);
73};
74
75}  // namespace cc
76#endif  // CC_LAYERS_CONTENT_LAYER_H_
77