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 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_