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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 #include "cc/resources/resource_format.h"
     12 
     13 namespace cc {
     14 class LayerUpdater;
     15 class PrioritizedResourceManager;
     16 class PrioritizedResource;
     17 class UpdatableTile;
     18 
     19 class CC_EXPORT TiledLayer : public ContentsScalingLayer {
     20  public:
     21   enum TilingOption {
     22     ALWAYS_TILE,
     23     NEVER_TILE,
     24     AUTO_TILE,
     25   };
     26 
     27   // Layer implementation.
     28   virtual void SetIsMask(bool is_mask) OVERRIDE;
     29   virtual void PushPropertiesTo(LayerImpl* layer) 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<Layer>* occlusion) OVERRIDE;
     39   virtual void OnOutputSurfaceCreated() 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(const gfx::Size& size);
     50   void SetTextureFormat(ResourceFormat 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(const 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();
     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(
     89       int left,
     90       int top,
     91       int right,
     92       int bottom,
     93       const OcclusionTracker<Layer>* occlusion);
     94 
     95   bool UpdateTiles(int left,
     96                    int top,
     97                    int right,
     98                    int bottom,
     99                    ResourceUpdateQueue* queue,
    100                    const OcclusionTracker<Layer>* occlusion,
    101                    bool* did_paint);
    102   bool HaveTexturesForTiles(int left,
    103                             int top,
    104                             int right,
    105                             int bottom,
    106                             bool ignore_occlusions);
    107   void MarkTilesForUpdate(gfx::Rect* update_rect,
    108                           gfx::Rect* paint_rect,
    109                           int left,
    110                           int top,
    111                           int right,
    112                           int bottom,
    113                           bool ignore_occlusions);
    114   void UpdateTileTextures(const gfx::Rect& update_rect,
    115                           const gfx::Rect& paint_rect,
    116                           int left,
    117                           int top,
    118                           int right,
    119                           int bottom,
    120                           ResourceUpdateQueue* queue,
    121                           const OcclusionTracker<Layer>* occlusion);
    122   void UpdateScrollPrediction();
    123 
    124   UpdatableTile* TileAt(int i, int j) const;
    125   UpdatableTile* CreateTile(int i, int j);
    126 
    127   bool IsSmallAnimatedLayer() const;
    128 
    129   ResourceFormat texture_format_;
    130   bool skips_draw_;
    131   bool failed_update_;
    132 
    133   // Used for predictive painting.
    134   gfx::Vector2d predicted_scroll_;
    135   gfx::Rect predicted_visible_rect_;
    136   gfx::Rect previous_visible_rect_;
    137   gfx::Size previous_content_bounds_;
    138 
    139   TilingOption tiling_option_;
    140   scoped_ptr<LayerTilingData> tiler_;
    141 
    142   DISALLOW_COPY_AND_ASSIGN(TiledLayer);
    143 };
    144 
    145 }  // namespace cc
    146 
    147 #endif  // CC_LAYERS_TILED_LAYER_H_
    148