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   void SetIsMask(bool is_mask) override;
  29   void PushPropertiesTo(LayerImpl* layer) override;
  30   void ReduceMemoryUsage() override;
  31   void SetNeedsDisplayRect(const gfx::Rect& dirty_rect) override;
  32   void SetLayerTreeHost(LayerTreeHost* layer_tree_host) override;
  33   void SetTexturePriorities(const PriorityCalculator& priority_calc) override;
  34   SimpleEnclosedRegion VisibleContentOpaqueRegion() const override;
  35   bool Update(ResourceUpdateQueue* queue,
  36               const OcclusionTracker<Layer>* occlusion) override;
  37   void OnOutputSurfaceCreated() override;
  38
  39  protected:
  40   TiledLayer();
  41   ~TiledLayer() override;
  42
  43   void UpdateTileSizeAndTilingOption();
  44   void UpdateBounds();
  45
  46   // Exposed to subclasses for testing.
  47   void SetTileSize(const gfx::Size& size);
  48   void SetTextureFormat(ResourceFormat texture_format) {
  49     texture_format_ = texture_format;
  50   }
  51   void SetBorderTexelOption(LayerTilingData::BorderTexelOption option);
  52   size_t NumPaintedTiles() { return tiler_->tiles().size(); }
  53
  54   virtual LayerUpdater* Updater() const = 0;
  55   virtual void CreateUpdaterIfNeeded() = 0;
  56
  57   // Set invalidations to be potentially repainted during Update().
  58   void InvalidateContentRect(const gfx::Rect& content_rect);
  59
  60   // Reset state on tiles that will be used for updating the layer.
  61   void ResetUpdateState();
  62
  63   // After preparing an update, returns true if more painting is needed.
  64   bool NeedsIdlePaint();
  65   gfx::Rect IdlePaintRect();
  66
  67   bool SkipsDraw() const { return skips_draw_; }
  68
  69   bool HasDrawableContent() const override;
  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   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) 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(
  88       int left,
  89       int top,
  90       int right,
  91       int bottom,
  92       const OcclusionTracker<Layer>* occlusion);
  93
  94   bool UpdateTiles(int left,
  95                    int top,
  96                    int right,
  97                    int bottom,
  98                    ResourceUpdateQueue* queue,
  99                    const OcclusionTracker<Layer>* occlusion,
 100                    bool* did_paint);
 101   bool HaveTexturesForTiles(int left,
 102                             int top,
 103                             int right,
 104                             int bottom,
 105                             bool ignore_occlusions);
 106   void MarkTilesForUpdate(gfx::Rect* update_rect,
 107                           gfx::Rect* paint_rect,
 108                           int left,
 109                           int top,
 110                           int right,
 111                           int bottom,
 112                           bool ignore_occlusions);
 113   void UpdateTileTextures(const gfx::Rect& update_rect,
 114                           const gfx::Rect& paint_rect,
 115                           int left,
 116                           int top,
 117                           int right,
 118                           int bottom,
 119                           ResourceUpdateQueue* queue,
 120                           const OcclusionTracker<Layer>* occlusion);
 121   void UpdateScrollPrediction();
 122
 123   UpdatableTile* TileAt(int i, int j) const;
 124   UpdatableTile* CreateTile(int i, int j);
 125
 126   bool IsSmallAnimatedLayer() const;
 127
 128   ResourceFormat texture_format_;
 129   bool skips_draw_;
 130   bool failed_update_;
 131
 132   // Used for predictive painting.
 133   gfx::Vector2d predicted_scroll_;
 134   gfx::Rect predicted_visible_rect_;
 135   gfx::Rect previous_visible_rect_;
 136   gfx::Size previous_content_bounds_;
 137
 138   TilingOption tiling_option_;
 139   scoped_ptr<LayerTilingData> tiler_;
 140
 141   DISALLOW_COPY_AND_ASSIGN(TiledLayer);
 142 };
 143
 144 }  // namespace cc
 145
 146 #endif  // CC_LAYERS_TILED_LAYER_H_