cc/resources/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_RESOURCES_PICTURE_LAYER_TILING_SET_H_
   6 #define CC_RESOURCES_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/resources/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       PictureLayerTilingClient* client,
  42       size_t max_tiles_for_interest_area,
  43       float skewport_target_time_in_seconds,
  44       int skewport_extrapolation_limit_in_content);
  45
  46   ~PictureLayerTilingSet();
  47
  48   const PictureLayerTilingClient* client() const { return client_; }
  49
  50   void CleanUpTilings(float min_acceptable_high_res_scale,
  51                       float max_acceptable_high_res_scale,
  52                       const std::vector<PictureLayerTiling*>& needed_tilings,
  53                       bool should_have_low_res,
  54                       PictureLayerTilingSet* twin_set,
  55                       PictureLayerTilingSet* recycled_twin_set);
  56   void RemoveNonIdealTilings();
  57
  58   void UpdateTilingsToCurrentRasterSource(
  59       scoped_refptr<RasterSource> raster_source,
  60       const PictureLayerTilingSet* twin_set,
  61       const Region& layer_invalidation,
  62       float minimum_contents_scale,
  63       float maximum_contents_scale);
  64
  65   PictureLayerTiling* AddTiling(float contents_scale,
  66                                 scoped_refptr<RasterSource> raster_source);
  67   size_t num_tilings() const { return tilings_.size(); }
  68   int NumHighResTilings() const;
  69   PictureLayerTiling* tiling_at(size_t idx) { return tilings_[idx]; }
  70   const PictureLayerTiling* tiling_at(size_t idx) const {
  71     return tilings_[idx];
  72   }
  73
  74   PictureLayerTiling* FindTilingWithScale(float scale) const;
  75   PictureLayerTiling* FindTilingWithResolution(TileResolution resolution) const;
  76
  77   void MarkAllTilingsNonIdeal();
  78
  79   // If a tiling exists whose scale is within |snap_to_existing_tiling_ratio|
  80   // ratio of |start_scale|, then return that tiling's scale. Otherwise, return
  81   // |start_scale|. If multiple tilings match the criteria, return the one with
  82   // the least ratio to |start_scale|.
  83   float GetSnappedContentsScale(float start_scale,
  84                                 float snap_to_existing_tiling_ratio) const;
  85
  86   // Returns the maximum contents scale of all tilings, or 0 if no tilings
  87   // exist.
  88   float GetMaximumContentsScale() const;
  89
  90   // Removes all tilings with a contents scale < |minimum_scale|.
  91   void RemoveTilingsBelowScale(float minimum_scale);
  92
  93   // Removes all tilings with a contents scale > |maximum_scale|.
  94   void RemoveTilingsAboveScale(float maximum_scale);
  95
  96   // Remove all tilings.
  97   void RemoveAllTilings();
  98
  99   // Remove all tiles; keep all tilings.
 100   void RemoveAllTiles();
 101
 102   // Update the rects and priorities for tiles based on the given information.
 103   bool UpdateTilePriorities(const gfx::Rect& required_rect_in_layer_space,
 104                             float ideal_contents_scale,
 105                             double current_frame_time_in_seconds,
 106                             const Occlusion& occlusion_in_layer_space,
 107                             bool can_require_tiles_for_activation);
 108
 109   void GetAllTilesForTracing(std::set<const Tile*>* tiles) const;
 110
 111   // For a given rect, iterates through tiles that can fill it.  If no
 112   // set of tiles with resources can fill the rect, then it will iterate
 113   // through null tiles with valid geometry_rect() until the rect is full.
 114   // If all tiles have resources, the union of all geometry_rects will
 115   // exactly fill rect with no overlap.
 116   class CC_EXPORT CoverageIterator {
 117    public:
 118     CoverageIterator(const PictureLayerTilingSet* set,
 119       float contents_scale,
 120       const gfx::Rect& content_rect,
 121       float ideal_contents_scale);
 122     ~CoverageIterator();
 123
 124     // Visible rect (no borders), always in the space of rect,
 125     // regardless of the relative contents scale of the tiling.
 126     gfx::Rect geometry_rect() const;
 127     // Texture rect (in texels) for geometry_rect
 128     gfx::RectF texture_rect() const;
 129
 130     Tile* operator->() const;
 131     Tile* operator*() const;
 132
 133     CoverageIterator& operator++();
 134     operator bool() const;
 135
 136     TileResolution resolution() const;
 137     PictureLayerTiling* CurrentTiling() const;
 138
 139    private:
 140     int NextTiling() const;
 141
 142     const PictureLayerTilingSet* set_;
 143     float contents_scale_;
 144     float ideal_contents_scale_;
 145     PictureLayerTiling::CoverageIterator tiling_iter_;
 146     int current_tiling_;
 147     int ideal_tiling_;
 148
 149     Region current_region_;
 150     Region missing_region_;
 151     Region::Iterator region_iter_;
 152   };
 153
 154   void AsValueInto(base::trace_event::TracedValue* array) const;
 155   size_t GPUMemoryUsageInBytes() const;
 156
 157   TilingRange GetTilingRange(TilingRangeType type) const;
 158
 159  private:
 160   explicit PictureLayerTilingSet(
 161       PictureLayerTilingClient* client,
 162       size_t max_tiles_for_interest_area,
 163       float skewport_target_time_in_seconds,
 164       int skewport_extrapolation_limit_in_content_pixels);
 165
 166   // Remove one tiling.
 167   void Remove(PictureLayerTiling* tiling);
 168
 169   ScopedPtrVector<PictureLayerTiling> tilings_;
 170
 171   const size_t max_tiles_for_interest_area_;
 172   const float skewport_target_time_in_seconds_;
 173   const int skewport_extrapolation_limit_in_content_pixels_;
 174   PictureLayerTilingClient* client_;
 175
 176   friend class Iterator;
 177   DISALLOW_COPY_AND_ASSIGN(PictureLayerTilingSet);
 178 };
 179
 180 }  // namespace cc
 181
 182 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_