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