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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 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 SimpleEnclosedRegion VisibleContentOpaqueRegion() const OVERRIDE;
     36   virtual bool Update(ResourceUpdateQueue* queue,
     37                       const OcclusionTracker<Layer>* occlusion) OVERRIDE;
     38   virtual void OnOutputSurfaceCreated() 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(const gfx::Size& size);
     49   void SetTextureFormat(ResourceFormat 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(const 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 bool HasDrawableContent() const OVERRIDE;
     71 
     72   // Virtual for testing
     73   virtual PrioritizedResourceManager* ResourceManager();
     74   const LayerTilingData* TilerForTesting() const { return tiler_.get(); }
     75   const PrioritizedResource* ResourceAtForTesting(int i, int j) const;
     76 
     77  private:
     78   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
     79       OVERRIDE;
     80 
     81   void CreateTilerIfNeeded();
     82   void set_tiling_option(TilingOption tiling_option) {
     83     tiling_option_ = tiling_option;
     84   }
     85 
     86   bool TileOnlyNeedsPartialUpdate(UpdatableTile* tile);
     87   bool TileNeedsBufferedUpdate(UpdatableTile* tile);
     88 
     89   void MarkOcclusionsAndRequestTextures(
     90       int left,
     91       int top,
     92       int right,
     93       int bottom,
     94       const OcclusionTracker<Layer>* occlusion);
     95 
     96   bool UpdateTiles(int left,
     97                    int top,
     98                    int right,
     99                    int bottom,
    100                    ResourceUpdateQueue* queue,
    101                    const OcclusionTracker<Layer>* occlusion,
    102                    bool* did_paint);
    103   bool HaveTexturesForTiles(int left,
    104                             int top,
    105                             int right,
    106                             int bottom,
    107                             bool ignore_occlusions);
    108   void MarkTilesForUpdate(gfx::Rect* update_rect,
    109                           gfx::Rect* paint_rect,
    110                           int left,
    111                           int top,
    112                           int right,
    113                           int bottom,
    114                           bool ignore_occlusions);
    115   void UpdateTileTextures(const gfx::Rect& update_rect,
    116                           const gfx::Rect& paint_rect,
    117                           int left,
    118                           int top,
    119                           int right,
    120                           int bottom,
    121                           ResourceUpdateQueue* queue,
    122                           const OcclusionTracker<Layer>* occlusion);
    123   void UpdateScrollPrediction();
    124 
    125   UpdatableTile* TileAt(int i, int j) const;
    126   UpdatableTile* CreateTile(int i, int j);
    127 
    128   bool IsSmallAnimatedLayer() const;
    129 
    130   ResourceFormat texture_format_;
    131   bool skips_draw_;
    132   bool failed_update_;
    133 
    134   // Used for predictive painting.
    135   gfx::Vector2d predicted_scroll_;
    136   gfx::Rect predicted_visible_rect_;
    137   gfx::Rect previous_visible_rect_;
    138   gfx::Size previous_content_bounds_;
    139 
    140   TilingOption tiling_option_;
    141   scoped_ptr<LayerTilingData> tiler_;
    142 
    143   DISALLOW_COPY_AND_ASSIGN(TiledLayer);
    144 };
    145 
    146 }  // namespace cc
    147 
    148 #endif  // CC_LAYERS_TILED_LAYER_H_
    149