tiled_layer.h revision 90dce4d38c5ff5333bea97d859d4e484e27edf0c 
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 BlocksPendingCommit() const OVERRIDE;
30  virtual bool DrawsContent() const OVERRIDE;
31  virtual void ReduceMemoryUsage() OVERRIDE;
32  virtual void SetNeedsDisplayRect(const gfx::RectF& dirty_rect) OVERRIDE;
33  virtual void SetLayerTreeHost(LayerTreeHost* layer_tree_host) OVERRIDE;
34  virtual void SetTexturePriorities(const PriorityCalculator& priority_calc)
35      OVERRIDE;
36  virtual Region VisibleContentOpaqueRegion() const OVERRIDE;
37  virtual void Update(ResourceUpdateQueue* queue,
38                      const OcclusionTracker* occlusion,
39                      RenderingStats* stats) OVERRIDE;
40
41 protected:
42  TiledLayer();
43  virtual ~TiledLayer();
44
45  void UpdateTileSizeAndTilingOption();
46  void UpdateBounds();
47
48  // Exposed to subclasses for testing.
49  void SetTileSize(gfx::Size size);
50  void SetTextureFormat(unsigned texture_format) {
51    texture_format_ = texture_format;
52  }
53  void SetBorderTexelOption(LayerTilingData::BorderTexelOption option);
54  size_t NumPaintedTiles() { return tiler_->tiles().size(); }
55
56  virtual LayerUpdater* Updater() const = 0;
57  virtual void CreateUpdaterIfNeeded() = 0;
58
59  // Set invalidations to be potentially repainted during Update().
60  void InvalidateContentRect(gfx::Rect content_rect);
61
62  // Reset state on tiles that will be used for updating the layer.
63  void ResetUpdateState();
64
65  // After preparing an update, returns true if more painting is needed.
66  bool NeedsIdlePaint();
67  gfx::Rect IdlePaintRect();
68
69  bool SkipsDraw() const { return skips_draw_; }
70
71  // Virtual for testing
72  virtual PrioritizedResourceManager* ResourceManager() const;
73  const LayerTilingData* TilerForTesting() const { return tiler_.get(); }
74  const PrioritizedResource* ResourceAtForTesting(int i, int j) const;
75
76 private:
77  virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
78      OVERRIDE;
79
80  void CreateTilerIfNeeded();
81  void set_tiling_option(TilingOption tiling_option) {
82    tiling_option_ = tiling_option;
83  }
84
85  bool TileOnlyNeedsPartialUpdate(UpdatableTile* tile);
86  bool TileNeedsBufferedUpdate(UpdatableTile* tile);
87
88  void MarkOcclusionsAndRequestTextures(int left,
89                                        int top,
90                                        int right,
91                                        int bottom,
92                                        const OcclusionTracker* occlusion);
93
94  bool UpdateTiles(int left,
95                   int top,
96                   int right,
97                   int bottom,
98                   ResourceUpdateQueue* queue,
99                   const OcclusionTracker* occlusion,
100                   RenderingStats* stats,
101                   bool* did_paint);
102  bool HaveTexturesForTiles(int left,
103                            int top,
104                            int right,
105                            int bottom,
106                            bool ignore_occlusions);
107  gfx::Rect MarkTilesForUpdate(int left,
108                               int top,
109                               int right,
110                               int bottom,
111                               bool ignore_occlusions);
112  void UpdateTileTextures(gfx::Rect paint_rect,
113                          int left,
114                          int top,
115                          int right,
116                          int bottom,
117                          ResourceUpdateQueue* queue,
118                          const OcclusionTracker* occlusion,
119                          RenderingStats* stats);
120  void UpdateScrollPrediction();
121
122  UpdatableTile* TileAt(int i, int j) const;
123  UpdatableTile* CreateTile(int i, int j);
124
125  bool IsSmallAnimatedLayer() const;
126
127  unsigned texture_format_;
128  bool skips_draw_;
129  bool failed_update_;
130
131  // Used for predictive painting.
132  gfx::Vector2d predicted_scroll_;
133  gfx::Rect predicted_visible_rect_;
134  gfx::Rect previous_visible_rect_;
135  gfx::Size previous_content_bounds_;
136
137  TilingOption tiling_option_;
138  scoped_ptr<LayerTilingData> tiler_;
139
140  DISALLOW_COPY_AND_ASSIGN(TiledLayer);
141};
142
143}  // namespace cc
144
145#endif  // CC_LAYERS_TILED_LAYER_H_
146