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 Occlusion& occlusion_in_content_space,
 111                            AppendQuadsData* append_quads_data) override;
 112   virtual void UpdateTiles(const Occlusion& occlusion_in_content_space,
 113                            bool resourceless_software_draw) 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   virtual bool RequiresHighResToDraw() const override;
 137
 138   // PushPropertiesTo active tree => pending tree.
 139   void SyncTiling(const PictureLayerTiling* tiling);
 140
 141   // Mask-related functions.
 142   virtual ResourceProvider::ResourceId ContentsResourceId() const override;
 143
 144   virtual size_t GPUMemoryUsageInBytes() const override;
 145
 146   virtual void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) override;
 147
 148   // Functions used by tile manager.
 149   PictureLayerImpl* GetTwinLayer() { return twin_layer_; }
 150   bool IsOnActiveOrPendingTree() const;
 151   // Virtual for testing.
 152   virtual bool HasValidTilePriorities() const;
 153   bool AllTilesRequiredForActivationAreReadyToDraw() const;
 154
 155  protected:
 156   friend class LayerRasterTileIterator;
 157
 158   PictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 159   PictureLayerTiling* AddTiling(float contents_scale);
 160   void RemoveTiling(float contents_scale);
 161   void RemoveAllTilings();
 162   void SyncFromActiveLayer(const PictureLayerImpl* other);
 163   void AddTilingsForRasterScale();
 164   void UpdateTilePriorities(const Occlusion& occlusion_in_content_space);
 165   virtual bool ShouldAdjustRasterScale() const;
 166   virtual void RecalculateRasterScales();
 167   void CleanUpTilingsOnActiveLayer(
 168       std::vector<PictureLayerTiling*> used_tilings);
 169   float MinimumContentsScale() const;
 170   float SnappedContentsScale(float new_contents_scale);
 171   void ResetRasterScale();
 172   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
 173   PictureLayerImpl* GetRecycledTwinLayer();
 174
 175   void DoPostCommitInitializationIfNeeded() {
 176     if (needs_post_commit_initialization_)
 177       DoPostCommitInitialization();
 178   }
 179   void DoPostCommitInitialization();
 180
 181   bool CanHaveTilings() const;
 182   bool CanHaveTilingWithScale(float contents_scale) const;
 183   void SanityCheckTilingState() const;
 184
 185   bool ShouldAdjustRasterScaleDuringScaleAnimations() const;
 186
 187   virtual void GetDebugBorderProperties(
 188       SkColor* color, float* width) const override;
 189   virtual void GetAllTilesForTracing(
 190       std::set<const Tile*>* tiles) const override;
 191   virtual void AsValueInto(base::debug::TracedValue* dict) const override;
 192
 193   virtual void UpdateIdealScales();
 194   float MaximumTilingContentsScale() const;
 195
 196   PictureLayerImpl* twin_layer_;
 197
 198   scoped_ptr<PictureLayerTilingSet> tilings_;
 199   scoped_refptr<PicturePileImpl> pile_;
 200   Region invalidation_;
 201
 202   float ideal_page_scale_;
 203   float ideal_device_scale_;
 204   float ideal_source_scale_;
 205   float ideal_contents_scale_;
 206
 207   float raster_page_scale_;
 208   float raster_device_scale_;
 209   float raster_source_scale_;
 210   float raster_contents_scale_;
 211   float low_res_raster_contents_scale_;
 212
 213   bool raster_source_scale_is_fixed_;
 214   bool was_screen_space_transform_animating_;
 215   bool needs_post_commit_initialization_;
 216   // A sanity state check to make sure UpdateTilePriorities only gets called
 217   // after a CalculateContentsScale/ManageTilings.
 218   bool should_update_tile_priorities_;
 219   bool only_used_low_res_last_append_quads_;
 220
 221   // Any draw properties derived from |transform|, |viewport|, and |clip|
 222   // parameters in LayerTreeHostImpl::SetExternalDrawConstraints are not valid
 223   // for prioritizing tiles during resourceless software draws. This is because
 224   // resourceless software draws can have wildly different transforms/viewports
 225   // from regular draws. Save a copy of the required draw properties of the last
 226   // frame that has a valid viewport for prioritizing tiles.
 227   gfx::Rect visible_rect_for_tile_priority_;
 228
 229   friend class PictureLayer;
 230   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 231 };
 232
 233 }  // namespace cc
 234
 235 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_