src/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   ~PictureLayerImpl() override;
 103
 104   // LayerImpl overrides.
 105   const char* LayerTypeAsString() const override;
 106   scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
 107   void PushPropertiesTo(LayerImpl* layer) override;
 108   void AppendQuads(RenderPass* render_pass,
 109                    const Occlusion& occlusion_in_content_space,
 110                    AppendQuadsData* append_quads_data) override;
 111   void UpdateTiles(const Occlusion& occlusion_in_content_space,
 112                    bool resourceless_software_draw) override;
 113   void NotifyTileStateChanged(const Tile* tile) override;
 114   void DidBecomeActive() override;
 115   void DidBeginTracing() override;
 116   void ReleaseResources() override;
 117   skia::RefPtr<SkPicture> GetPicture() override;
 118
 119   // PictureLayerTilingClient overrides.
 120   scoped_refptr<Tile> CreateTile(PictureLayerTiling* tiling,
 121                                  const gfx::Rect& content_rect) override;
 122   RasterSource* GetRasterSource() override;
 123   gfx::Size CalculateTileSize(const gfx::Size& content_bounds) const override;
 124   const Region* GetPendingInvalidation() override;
 125   const PictureLayerTiling* GetPendingOrActiveTwinTiling(
 126       const PictureLayerTiling* tiling) const override;
 127   PictureLayerTiling* GetRecycledTwinTiling(
 128       const PictureLayerTiling* tiling) override;
 129   size_t GetMaxTilesForInterestArea() const override;
 130   float GetSkewportTargetTimeInSeconds() const override;
 131   int GetSkewportExtrapolationLimitInContentPixels() const override;
 132   WhichTree GetTree() const override;
 133   bool RequiresHighResToDraw() const override;
 134
 135   // PushPropertiesTo active tree => pending tree.
 136   void SyncTiling(const PictureLayerTiling* tiling);
 137
 138   // Mask-related functions.
 139   void GetContentsResourceId(ResourceProvider::ResourceId* resource_id,
 140                              gfx::Size* resource_size) const override;
 141
 142   size_t GPUMemoryUsageInBytes() const override;
 143
 144   void RunMicroBenchmark(MicroBenchmarkImpl* benchmark) override;
 145
 146   // Functions used by tile manager.
 147   PictureLayerImpl* GetPendingOrActiveTwinLayer() const;
 148   bool IsOnActiveOrPendingTree() const;
 149   // Virtual for testing.
 150   virtual bool HasValidTilePriorities() const;
 151   bool AllTilesRequiredForActivationAreReadyToDraw() const;
 152
 153  protected:
 154   friend class LayerRasterTileIterator;
 155
 156   PictureLayerImpl(LayerTreeImpl* tree_impl, int id);
 157   PictureLayerTiling* AddTiling(float contents_scale);
 158   void RemoveTiling(float contents_scale);
 159   void RemoveAllTilings();
 160   void SyncFromActiveLayer(const PictureLayerImpl* other);
 161   void AddTilingsForRasterScale();
 162   void UpdateTilePriorities(const Occlusion& occlusion_in_content_space);
 163   virtual bool ShouldAdjustRasterScale() const;
 164   virtual void RecalculateRasterScales();
 165   void CleanUpTilingsOnActiveLayer(
 166       std::vector<PictureLayerTiling*> used_tilings);
 167   float MinimumContentsScale() const;
 168   float SnappedContentsScale(float new_contents_scale);
 169   void ResetRasterScale();
 170   gfx::Rect GetViewportForTilePriorityInContentSpace() const;
 171   PictureLayerImpl* GetRecycledTwinLayer() const;
 172   void UpdatePile(scoped_refptr<PicturePileImpl> pile);
 173
 174   void DoPostCommitInitializationIfNeeded() {
 175     if (needs_post_commit_initialization_)
 176       DoPostCommitInitialization();
 177   }
 178   void DoPostCommitInitialization();
 179
 180   bool CanHaveTilings() const;
 181   bool CanHaveTilingWithScale(float contents_scale) const;
 182   void SanityCheckTilingState() const;
 183
 184   bool ShouldAdjustRasterScaleDuringScaleAnimations() const;
 185
 186   void GetDebugBorderProperties(SkColor* color, float* width) const override;
 187   void GetAllTilesForTracing(std::set<const Tile*>* tiles) const override;
 188   void AsValueInto(base::debug::TracedValue* dict) const override;
 189
 190   virtual void UpdateIdealScales();
 191   float MaximumTilingContentsScale() const;
 192
 193   PictureLayerImpl* twin_layer_;
 194
 195   scoped_ptr<PictureLayerTilingSet> tilings_;
 196   scoped_refptr<PicturePileImpl> pile_;
 197   Region invalidation_;
 198
 199   float ideal_page_scale_;
 200   float ideal_device_scale_;
 201   float ideal_source_scale_;
 202   float ideal_contents_scale_;
 203
 204   float raster_page_scale_;
 205   float raster_device_scale_;
 206   float raster_source_scale_;
 207   float raster_contents_scale_;
 208   float low_res_raster_contents_scale_;
 209
 210   bool raster_source_scale_is_fixed_;
 211   bool was_screen_space_transform_animating_;
 212   bool needs_post_commit_initialization_;
 213   // A sanity state check to make sure UpdateTilePriorities only gets called
 214   // after a CalculateContentsScale/ManageTilings.
 215   bool should_update_tile_priorities_;
 216   bool only_used_low_res_last_append_quads_;
 217
 218   // Any draw properties derived from |transform|, |viewport|, and |clip|
 219   // parameters in LayerTreeHostImpl::SetExternalDrawConstraints are not valid
 220   // for prioritizing tiles during resourceless software draws. This is because
 221   // resourceless software draws can have wildly different transforms/viewports
 222   // from regular draws. Save a copy of the required draw properties of the last
 223   // frame that has a valid viewport for prioritizing tiles.
 224   gfx::Rect visible_rect_for_tile_priority_;
 225
 226   friend class PictureLayer;
 227   DISALLOW_COPY_AND_ASSIGN(PictureLayerImpl);
 228 };
 229
 230 }  // namespace cc
 231
 232 #endif  // CC_LAYERS_PICTURE_LAYER_IMPL_H_