cc/tiles/picture_layer_tiling_set.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_TILES_PICTURE_LAYER_TILING_SET_H_
   6 #define CC_TILES_PICTURE_LAYER_TILING_SET_H_
   7
   8 #include <set>
   9 #include <vector>
  10
  11 #include "cc/base/region.h"
  12 #include "cc/base/scoped_ptr_vector.h"
  13 #include "cc/tiles/picture_layer_tiling.h"
  14 #include "ui/gfx/geometry/size.h"
  15
  16 namespace base {
  17 namespace trace_event {
  18 class TracedValue;
  19 }
  20 }
  21
  22 namespace cc {
  23
  24 class CC_EXPORT PictureLayerTilingSet {
  25  public:
  26   enum TilingRangeType {
  27     HIGHER_THAN_HIGH_RES,
  28     HIGH_RES,
  29     BETWEEN_HIGH_AND_LOW_RES,
  30     LOW_RES,
  31     LOWER_THAN_LOW_RES
  32   };
  33   struct TilingRange {
  34     TilingRange(size_t start, size_t end) : start(start), end(end) {}
  35
  36     size_t start;
  37     size_t end;
  38   };
  39
  40   static scoped_ptr<PictureLayerTilingSet> Create(
  41       WhichTree tree,
  42       PictureLayerTilingClient* client,
  43       size_t tiling_interest_area_padding,
  44       float skewport_target_time_in_seconds,
  45       int skewport_extrapolation_limit_in_content);
  46
  47   ~PictureLayerTilingSet();
  48
  49   const PictureLayerTilingClient* client() const { return client_; }
  50
  51   void CleanUpTilings(float min_acceptable_high_res_scale,
  52                       float max_acceptable_high_res_scale,
  53                       const std::vector<PictureLayerTiling*>& needed_tilings,
  54                       PictureLayerTilingSet* twin_set);
  55   void RemoveNonIdealTilings();
  56
  57   // This function is called on the active tree during activation.
  58   void UpdateTilingsToCurrentRasterSourceForActivation(
  59       scoped_refptr<RasterSource> raster_source,
  60       const PictureLayerTilingSet* pending_twin_set,
  61       const Region& layer_invalidation,
  62       float minimum_contents_scale,
  63       float maximum_contents_scale);
  64
  65   // This function is called on the sync tree during commit.
  66   void UpdateTilingsToCurrentRasterSourceForCommit(
  67       scoped_refptr<RasterSource> raster_source,
  68       const Region& layer_invalidation,
  69       float minimum_contents_scale,
  70       float maximum_contents_scale);
  71
  72   // This function is called on the sync tree right after commit.
  73   void UpdateRasterSourceDueToLCDChange(
  74       const scoped_refptr<RasterSource>& raster_source,
  75       const Region& layer_invalidation);
  76
  77   PictureLayerTiling* AddTiling(float contents_scale,
  78                                 scoped_refptr<RasterSource> raster_source);
  79   size_t num_tilings() const { return tilings_.size(); }
  80   int NumHighResTilings() const;
  81   PictureLayerTiling* tiling_at(size_t idx) { return tilings_[idx]; }
  82   const PictureLayerTiling* tiling_at(size_t idx) const {
  83     return tilings_[idx];
  84   }
  85   WhichTree tree() const { return tree_; }
  86
  87   PictureLayerTiling* FindTilingWithScale(float scale) const;
  88   PictureLayerTiling* FindTilingWithResolution(TileResolution resolution) const;
  89
  90   void MarkAllTilingsNonIdeal();
  91
  92   // If a tiling exists whose scale is within |snap_to_existing_tiling_ratio|
  93   // ratio of |start_scale|, then return that tiling's scale. Otherwise, return
  94   // |start_scale|. If multiple tilings match the criteria, return the one with
  95   // the least ratio to |start_scale|.
  96   float GetSnappedContentsScale(float start_scale,
  97                                 float snap_to_existing_tiling_ratio) const;
  98
  99   // Returns the maximum contents scale of all tilings, or 0 if no tilings
 100   // exist.
 101   float GetMaximumContentsScale() const;
 102
 103   // Removes all tilings with a contents scale < |minimum_scale|.
 104   void RemoveTilingsBelowScale(float minimum_scale);
 105
 106   // Removes all tilings with a contents scale > |maximum_scale|.
 107   void RemoveTilingsAboveScale(float maximum_scale);
 108
 109   // Remove all tilings.
 110   void RemoveAllTilings();
 111
 112   // Remove all tiles; keep all tilings.
 113   void RemoveAllTiles();
 114
 115   // Update the rects and priorities for tiles based on the given information.
 116   bool UpdateTilePriorities(const gfx::Rect& required_rect_in_layer_space,
 117                             float ideal_contents_scale,
 118                             double current_frame_time_in_seconds,
 119                             const Occlusion& occlusion_in_layer_space,
 120                             bool can_require_tiles_for_activation);
 121
 122   void GetAllPrioritizedTilesForTracing(
 123       std::vector<PrioritizedTile>* prioritized_tiles) const;
 124
 125   // For a given rect, iterates through tiles that can fill it.  If no
 126   // set of tiles with resources can fill the rect, then it will iterate
 127   // through null tiles with valid geometry_rect() until the rect is full.
 128   // If all tiles have resources, the union of all geometry_rects will
 129   // exactly fill rect with no overlap.
 130   class CC_EXPORT CoverageIterator {
 131    public:
 132     CoverageIterator(const PictureLayerTilingSet* set,
 133       float contents_scale,
 134       const gfx::Rect& content_rect,
 135       float ideal_contents_scale);
 136     ~CoverageIterator();
 137
 138     // Visible rect (no borders), always in the space of rect,
 139     // regardless of the relative contents scale of the tiling.
 140     gfx::Rect geometry_rect() const;
 141     // Texture rect (in texels) for geometry_rect
 142     gfx::RectF texture_rect() const;
 143
 144     Tile* operator->() const;
 145     Tile* operator*() const;
 146
 147     CoverageIterator& operator++();
 148     operator bool() const;
 149
 150     TileResolution resolution() const;
 151     PictureLayerTiling* CurrentTiling() const;
 152
 153    private:
 154     size_t NextTiling() const;
 155
 156     const PictureLayerTilingSet* set_;
 157     float contents_scale_;
 158     float ideal_contents_scale_;
 159     PictureLayerTiling::CoverageIterator tiling_iter_;
 160     size_t current_tiling_;
 161     size_t ideal_tiling_;
 162
 163     Region current_region_;
 164     Region missing_region_;
 165     Region::Iterator region_iter_;
 166   };
 167
 168   void AsValueInto(base::trace_event::TracedValue* array) const;
 169   size_t GPUMemoryUsageInBytes() const;
 170
 171   TilingRange GetTilingRange(TilingRangeType type) const;
 172
 173  private:
 174   explicit PictureLayerTilingSet(
 175       WhichTree tree,
 176       PictureLayerTilingClient* client,
 177       size_t tiling_interest_area_padding,
 178       float skewport_target_time_in_seconds,
 179       int skewport_extrapolation_limit_in_content_pixels);
 180
 181   void CopyTilingsAndPropertiesFromPendingTwin(
 182       const PictureLayerTilingSet* pending_twin_set,
 183       const scoped_refptr<RasterSource>& raster_source,
 184       const Region& layer_invalidation);
 185
 186   // Remove one tiling.
 187   void Remove(PictureLayerTiling* tiling);
 188   void VerifyTilings(const PictureLayerTilingSet* pending_twin_set) const;
 189
 190   ScopedPtrVector<PictureLayerTiling> tilings_;
 191
 192   const size_t tiling_interest_area_padding_;
 193   const float skewport_target_time_in_seconds_;
 194   const int skewport_extrapolation_limit_in_content_pixels_;
 195   WhichTree tree_;
 196   PictureLayerTilingClient* client_;
 197
 198   friend class Iterator;
 199   DISALLOW_COPY_AND_ASSIGN(PictureLayerTilingSet);
 200 };
 201
 202 }  // namespace cc
 203
 204 #endif  // CC_TILES_PICTURE_LAYER_TILING_SET_H_