tiled_layer.h revision 424c4d7b64af9d0d8fd9624f381f469654d5e3d2 
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_LAYERS_TILED_LAYER_H_
6#define CC_LAYERS_TILED_LAYER_H_
7
8#include "cc/base/cc_export.h"
9#include "cc/layers/contents_scaling_layer.h"
10#include "cc/resources/layer_tiling_data.h"
11
12namespace cc {
13class LayerUpdater;
14class PrioritizedResourceManager;
15class PrioritizedResource;
16class UpdatableTile;
17
18class CC_EXPORT TiledLayer : public ContentsScalingLayer {
19 public:
20  enum TilingOption {
21    ALWAYS_TILE,
22    NEVER_TILE,
23    AUTO_TILE,
24  };
25
26  // Layer implementation.
27  virtual void SetIsMask(bool is_mask) OVERRIDE;
28  virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
29  virtual bool DrawsContent() const OVERRIDE;
30  virtual void ReduceMemoryUsage() OVERRIDE;
31  virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect) OVERRIDE;
32  virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
33  virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
34      OVERRIDE;
35  virtual Region VisibleContentOpaqueRegion() const OVERRIDE;
36  virtual bool Update(ResourceUpdateQueue* queue,
37                      const OcclusionTracker* occlusion) OVERRIDE;
38
39 protected:
40  TiledLayer();
41  virtual ~TiledLayer();
42
43  void UpdateTileSizeAndTilingOption();
44  void UpdateBounds();
45
46  // Exposed to subclasses for testing.
47  void SetTileSize(gfx::Size size);
48  void SetTextureFormat(unsigned texture_format) {
49    texture_format_ = texture_format;
50  }
51  void SetBorderTexelOption(LayerTilingData::BorderTexelOption option);
52  size_t NumPaintedTiles() { return tiler_->tiles().size(); }
53
54  virtual LayerUpdater* Updater() const = 0;
55  virtual void CreateUpdaterIfNeeded() = 0;
56
57  // Set invalidations to be potentially repainted during Update().
58  void InvalidateContentRect(gfx::Rect content_rect);
59
60  // Reset state on tiles that will be used for updating the layer.
61  void ResetUpdateState();
62
63  // After preparing an update, returns true if more painting is needed.
64  bool NeedsIdlePaint();
65  gfx::Rect IdlePaintRect();
66
67  bool SkipsDraw() const { return skips_draw_; }
68
69  // Virtual for testing
70  virtual PrioritizedResourceManager* ResourceManager();
71  const LayerTilingData* TilerForTesting() const { return tiler_.get(); }
72  const PrioritizedResource* ResourceAtForTesting(int i, int j) const;
73
74 private:
75  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
76      OVERRIDE;
77
78  void CreateTilerIfNeeded();
79  void set_tiling_option(TilingOption tiling_option) {
80    tiling_option_ = tiling_option;
81  }
82
83  bool TileOnlyNeedsPartialUpdate(UpdatableTile* tile);
84  bool TileNeedsBufferedUpdate(UpdatableTile* tile);
85
86  void MarkOcclusionsAndRequestTextures(int left,
87                                        int top,
88                                        int right,
89                                        int bottom,
90                                        const OcclusionTracker* occlusion);
91
92  bool UpdateTiles(int left,
93                   int top,
94                   int right,
95                   int bottom,
96                   ResourceUpdateQueue* queue,
97                   const OcclusionTracker* occlusion,
98                   bool* did_paint);
99  bool HaveTexturesForTiles(int left,
100                            int top,
101                            int right,
102                            int bottom,
103                            bool ignore_occlusions);
104  gfx::Rect MarkTilesForUpdate(int left,
105                               int top,
106                               int right,
107                               int bottom,
108                               bool ignore_occlusions);
109  void UpdateTileTextures(gfx::Rect paint_rect,
110                          int left,
111                          int top,
112                          int right,
113                          int bottom,
114                          ResourceUpdateQueue* queue,
115                          const OcclusionTracker* occlusion);
116  void UpdateScrollPrediction();
117
118  UpdatableTile* TileAt(int i, int j) const;
119  UpdatableTile* CreateTile(int i, int j);
120
121  bool IsSmallAnimatedLayer() const;
122
123  unsigned texture_format_;
124  bool skips_draw_;
125  bool failed_update_;
126
127  // Used for predictive painting.
128  gfx::Vector2d predicted_scroll_;
129  gfx::Rect predicted_visible_rect_;
130  gfx::Rect previous_visible_rect_;
131  gfx::Size previous_content_bounds_;
132
133  TilingOption tiling_option_;
134  scoped_ptr<LayerTilingData> tiler_;
135
136  DISALLOW_COPY_AND_ASSIGN(TiledLayer);
137};
138
139}  // namespace cc
140
141#endif  // CC_LAYERS_TILED_LAYER_H_
142