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      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 
     12 namespace cc {
     13 class LayerUpdater;
     14 class PrioritizedResourceManager;
     15 class PrioritizedResource;
     16 class UpdatableTile;
     17 
     18 class 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 bool Update(ResourceUpdateQueue* queue,
     38                       const OcclusionTracker* occlusion) OVERRIDE;
     39 
     40  protected:
     41   TiledLayer();
     42   virtual ~TiledLayer();
     43 
     44   void UpdateTileSizeAndTilingOption();
     45   void UpdateBounds();
     46 
     47   // Exposed to subclasses for testing.
     48   void SetTileSize(gfx::Size size);
     49   void SetTextureFormat(unsigned texture_format) {
     50     texture_format_ = texture_format;
     51   }
     52   void SetBorderTexelOption(LayerTilingData::BorderTexelOption option);
     53   size_t NumPaintedTiles() { return tiler_->tiles().size(); }
     54 
     55   virtual LayerUpdater* Updater() const = 0;
     56   virtual void CreateUpdaterIfNeeded() = 0;
     57 
     58   // Set invalidations to be potentially repainted during Update().
     59   void InvalidateContentRect(gfx::Rect content_rect);
     60 
     61   // Reset state on tiles that will be used for updating the layer.
     62   void ResetUpdateState();
     63 
     64   // After preparing an update, returns true if more painting is needed.
     65   bool NeedsIdlePaint();
     66   gfx::Rect IdlePaintRect();
     67 
     68   bool SkipsDraw() const { return skips_draw_; }
     69 
     70   // Virtual for testing
     71   virtual PrioritizedResourceManager* ResourceManager() const;
     72   const LayerTilingData* TilerForTesting() const { return tiler_.get(); }
     73   const PrioritizedResource* ResourceAtForTesting(int i, int j) const;
     74 
     75  private:
     76   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
     77       OVERRIDE;
     78 
     79   void CreateTilerIfNeeded();
     80   void set_tiling_option(TilingOption tiling_option) {
     81     tiling_option_ = tiling_option;
     82   }
     83 
     84   bool TileOnlyNeedsPartialUpdate(UpdatableTile* tile);
     85   bool TileNeedsBufferedUpdate(UpdatableTile* tile);
     86 
     87   void MarkOcclusionsAndRequestTextures(int left,
     88                                         int top,
     89                                         int right,
     90                                         int bottom,
     91                                         const OcclusionTracker* occlusion);
     92 
     93   bool UpdateTiles(int left,
     94                    int top,
     95                    int right,
     96                    int bottom,
     97                    ResourceUpdateQueue* queue,
     98                    const OcclusionTracker* occlusion,
     99                    bool* did_paint);
    100   bool HaveTexturesForTiles(int left,
    101                             int top,
    102                             int right,
    103                             int bottom,
    104                             bool ignore_occlusions);
    105   gfx::Rect MarkTilesForUpdate(int left,
    106                                int top,
    107                                int right,
    108                                int bottom,
    109                                bool ignore_occlusions);
    110   void UpdateTileTextures(gfx::Rect paint_rect,
    111                           int left,
    112                           int top,
    113                           int right,
    114                           int bottom,
    115                           ResourceUpdateQueue* queue,
    116                           const OcclusionTracker* occlusion);
    117   void UpdateScrollPrediction();
    118 
    119   UpdatableTile* TileAt(int i, int j) const;
    120   UpdatableTile* CreateTile(int i, int j);
    121 
    122   bool IsSmallAnimatedLayer() const;
    123 
    124   unsigned texture_format_;
    125   bool skips_draw_;
    126   bool failed_update_;
    127 
    128   // Used for predictive painting.
    129   gfx::Vector2d predicted_scroll_;
    130   gfx::Rect predicted_visible_rect_;
    131   gfx::Rect previous_visible_rect_;
    132   gfx::Size previous_content_bounds_;
    133 
    134   TilingOption tiling_option_;
    135   scoped_ptr<LayerTilingData> tiler_;
    136 
    137   DISALLOW_COPY_AND_ASSIGN(TiledLayer);
    138 };
    139 
    140 }  // namespace cc
    141 
    142 #endif  // CC_LAYERS_TILED_LAYER_H_
    143