cc/layers/tiled_layer.h

   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* 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(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(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(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                    bool* did_paint);
 101   bool HaveTexturesForTiles(int left,
 102                             int top,
 103                             int right,
 104                             int bottom,
 105                             bool ignore_occlusions);
 106   gfx::Rect MarkTilesForUpdate(int left,
 107                                int top,
 108                                int right,
 109                                int bottom,
 110                                bool ignore_occlusions);
 111   void UpdateTileTextures(gfx::Rect paint_rect,
 112                           int left,
 113                           int top,
 114                           int right,
 115                           int bottom,
 116                           ResourceUpdateQueue* queue,
 117                           const OcclusionTracker* occlusion);
 118   void UpdateScrollPrediction();
 119
 120   UpdatableTile* TileAt(int i, int j) const;
 121   UpdatableTile* CreateTile(int i, int j);
 122
 123   bool IsSmallAnimatedLayer() const;
 124
 125   ResourceFormat texture_format_;
 126   bool skips_draw_;
 127   bool failed_update_;
 128
 129   // Used for predictive painting.
 130   gfx::Vector2d predicted_scroll_;
 131   gfx::Rect predicted_visible_rect_;
 132   gfx::Rect previous_visible_rect_;
 133   gfx::Size previous_content_bounds_;
 134
 135   TilingOption tiling_option_;
 136   scoped_ptr<LayerTilingData> tiler_;
 137
 138   DISALLOW_COPY_AND_ASSIGN(TiledLayer);
 139 };
 140
 141 }  // namespace cc
 142
 143 #endif  // CC_LAYERS_TILED_LAYER_H_