cc/layers/picture_layer_impl.h

   1 // Copyright 2012 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_PICTURE_LAYER_IMPL_H_
   6 #define CC_LAYERS_PICTURE_LAYER_IMPL_H_
   7
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "cc/base/cc_export.h"
  13 #include "cc/base/scoped_ptr_vector.h"
  14 #include "cc/layers/layer_impl.h"
  15 #include "cc/resources/picture_layer_tiling.h"
  16 #include "cc/resources/picture_layer_tiling_set.h"
  17 #include "cc/resources/picture_pile_impl.h"
  18 #include "skia/ext/refptr.h"
  19 #include "third_party/skia/include/core/SkPicture.h"
  20
  21 namespace cc {
  22
  23 struct AppendQuadsData;
  24 class MicroBenchmarkImpl;
  25 class Tile;
  26
  27 class CC_EXPORT PictureLayerImpl
  28     : public LayerImpl,
  29       NON_EXPORTED_BASE(public PictureLayerTilingClient) {
  30  public:
  31   struct CC_EXPORT Pair {
  32     Pair();
  33     Pair(PictureLayerImpl* active_layer, PictureLayerImpl* pending_layer);
  34     ~Pair();
  35
  36     PictureLayerImpl* active;
  37     PictureLayerImpl* pending;
  38   };
  39
  40   class CC_EXPORT LayerRasterTileIterator {
  41    public:
  42     LayerRasterTileIterator();
  43     LayerRasterTileIterator(PictureLayerImpl* layer, bool prioritize_low_res);
  44     ~LayerRasterTileIterator();
  45
  46     Tile* operator*();
  47     const Tile* operator*() const;
  48     LayerRasterTileIterator& operator++();
  49     operator bool() const;
  50
  51    private:
  52     enum IteratorType { LOW_RES, HIGH_RES, NUM_ITERATORS };
  53
  54     void AdvanceToNextStage();
  55
  56     PictureLayerImpl* layer_;
  57
  58     struct IterationStage {
  59       IteratorType iterator_type;
  60       TilePriority::PriorityBin tile_type;
  61     };
  62
  63     size_t current_stage_;
  64
  65     // One low res stage, and three high res stages.
  66     IterationStage stages_[4];
  67     PictureLayerTiling::TilingRasterTileIterator iterators_[NUM_ITERATORS];
  68   };
  69
  70   class CC_EXPORT LayerEvictionTileIterator {
  71    public:
  72     LayerEvictionTileIterator();
  73     LayerEvictionTileIterator(PictureLayerImpl* layer,
  74                               TreePriority tree_priority);
  75     ~LayerEvictionTileIterator();
  76
  77     Tile* operator*();
  78     const Tile* operator*() const;
  79     LayerEvictionTileIterator& operator++();
  80     operator bool() const;
  81
  82    private:
  83     bool AdvanceToNextCategory();
  84     bool AdvanceToNextTilingRangeType();
  85     bool AdvanceToNextTiling();
  86
  87     PictureLayerTilingSet::TilingRange CurrentTilingRange() const;
  88     size_t CurrentTilingIndex() const;
  89
  90     PictureLayerImpl* layer_;
  91     TreePriority tree_priority_;
  92
  93     PictureLayerTiling::EvictionCategory current_category_;
  94     PictureLayerTilingSet::TilingRangeType current_tiling_range_type_;
  95     size_t current_tiling_;
  96     PictureLayerTiling::TilingEvictionTileIterator current_iterator_;
  97   };
  98
  99   static scoped_ptr<PictureLayerImpl> Create(LayerTreeImpl* tree_impl, int id) {
 100     return make_scoped_ptr(new PictureLayerImpl(tree_impl, id));
 101   }
 102   virtual ~PictureLayerImpl();
 103
 104   // LayerImpl overrides.
 105   virtual const char* LayerTypeAsString() const OVERRIDE;
 106   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
 107       OVERRIDE;
 108   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 109   virtual void AppendQuads(RenderPass* render_pass,
 110                            const OcclusionTracker<LayerImpl>& occlusion_tracker,
 111                            AppendQuadsData* append_quads_data) OVERRIDE;
 112   virtual void UpdateTiles(
 113       const Occlusion& occlusion_in_content_space) OVERRIDE;
 114   virtual void NotifyTileStateChanged(const Tile* tile) OVERRIDE;
 115   virtual void DidBecomeActive() OVERRIDE;
 116   virtual void DidBeginTracing() OVERRIDE;
 117   virtual void ReleaseResources() OVERRIDE;
 118   virtual skia::RefPtr<SkPicture> GetPicture() OVERRIDE;
 119
 120   // PictureLayerTilingClient overrides.
 121   virtual scoped_refptr<Tile> CreateTile(
 122     PictureLayerTiling* tiling,
 123     const gfx::Rect& content_rect) OVERRIDE;
 124   virtual PicturePileImpl* GetPile() OVERRIDE;
 125   virtual gfx::Size CalculateTileSize(
 126       const gfx::Size& content_bounds) const OVERRIDE;
 127   virtual const Region* GetInvalidation() OVERRIDE;
 128   virtual const PictureLayerTiling* GetTwinTiling(
 129       const PictureLayerTiling* tiling) const OVERRIDE;
 130   virtual PictureLayerTiling* GetRecycledTwinTiling(
 131       const PictureLayerTiling* tiling) OVERRIDE;
 132   virtual size_t GetMaxTilesForInterestArea() const OVERRIDE;
 133   virtual float GetSkewportTargetTimeInSeconds() const OVERRIDE;
 134   virtual int GetSkewportExtrapolationLimitInContentPixels() const OVERRIDE;
 135   virtual WhichTree GetTree() const OVERRIDE;
 136
 137   // PushPropertiesTo active tree => pending tree.
 138   void SyncTiling(const PictureLayerTiling* tiling);
 139
 140   // Mask-related functions.
 141   virtual ResourceProvider::ResourceId ContentsResourceId() const OVERRIDE;
 142
 143   virtual size_t GPUMemoryUsageInBytes() const OVERRIDE;
 144
 145   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) OVERRIDE;
 146
 147   // Functions used by tile manager.
 148   PictureLayerImpl* GetTwinLayer() { return twin_layer_; }
 149   bool IsOnActiveOrPendingTree() const;
 150   // Virtual for testing.
 151   virtual bool HasValidTilePriorities() const;
 152   bool AllTilesRequiredForActivationAreReadyToDraw() const;
 153
 154  protected:
 155   friend class LayerRasterTileIterator;
 156
 157   PictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 158   PictureLayerTiling* AddTiling(float contents_scale);
 159   void RemoveTiling(float contents_scale);
 160   void RemoveAllTilings();
 161   void SyncFromActiveLayer(const PictureLayerImpl* other);
 162   void AddTilingsForRasterScale();
 163   void UpdateTilePriorities(const Occlusion& occlusion_in_content_space);
 164   virtual bool ShouldAdjustRasterScale() const;
 165   virtual void RecalculateRasterScales();
 166   void CleanUpTilingsOnActiveLayer(
 167       std::vector<PictureLayerTiling*> used_tilings);
 168   float MinimumContentsScale() const;
 169   float SnappedContentsScale(float new_contents_scale);
 170   void ResetRasterScale();
 171   void MarkVisibleResourcesAsRequired() const;
 172   bool MarkVisibleTilesAsRequired(
 173       PictureLayerTiling* tiling,
 174       const PictureLayerTiling* optional_twin_tiling,
 175       const gfx::Rect& rect,
 176       const Region& missing_region) const;
 177   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
 178   PictureLayerImpl* GetRecycledTwinLayer();
 179
 180   void DoPostCommitInitializationIfNeeded() {
 181     if (needs_post_commit_initialization_)
 182       DoPostCommitInitialization();
 183   }
 184   void DoPostCommitInitialization();
 185
 186   bool CanHaveTilings() const;
 187   bool CanHaveTilingWithScale(float contents_scale) const;
 188   void SanityCheckTilingState() const;
 189
 190   bool ShouldAdjustRasterScaleDuringScaleAnimations() const;
 191
 192   virtual void GetDebugBorderProperties(
 193       SkColor* color, float* width) const OVERRIDE;
 194   virtual void GetAllTilesForTracing(
 195       std::set<const Tile*>* tiles) const OVERRIDE;
 196   virtual void AsValueInto(base::debug::TracedValue* dict) const OVERRIDE;
 197
 198   virtual void UpdateIdealScales();
 199   float MaximumTilingContentsScale() const;
 200
 201   PictureLayerImpl* twin_layer_;
 202
 203   scoped_ptr<PictureLayerTilingSet> tilings_;
 204   scoped_refptr<PicturePileImpl> pile_;
 205   Region invalidation_;
 206
 207   float ideal_page_scale_;
 208   float ideal_device_scale_;
 209   float ideal_source_scale_;
 210   float ideal_contents_scale_;
 211
 212   float raster_page_scale_;
 213   float raster_device_scale_;
 214   float raster_source_scale_;
 215   float raster_contents_scale_;
 216   float low_res_raster_contents_scale_;
 217
 218   bool raster_source_scale_is_fixed_;
 219   bool was_screen_space_transform_animating_;
 220   bool needs_post_commit_initialization_;
 221   // A sanity state check to make sure UpdateTilePriorities only gets called
 222   // after a CalculateContentsScale/ManageTilings.
 223   bool should_update_tile_priorities_;
 224
 225   // Save a copy of the visible rect and viewport size of the last frame that
 226   // has a valid viewport for prioritizing tiles.
 227   gfx::Rect visible_rect_for_tile_priority_;
 228   gfx::Rect viewport_rect_for_tile_priority_;
 229   gfx::Transform screen_space_transform_for_tile_priority_;
 230
 231   friend class PictureLayer;
 232   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 233 };
 234
 235 }  // namespace cc
 236
 237 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_