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 "cc/base/region.h"
   9 #include "cc/base/scoped_ptr_vector.h"
  10 #include "cc/resources/picture_layer_tiling.h"
  11 #include "ui/gfx/size.h"
  12
  13 namespace cc {
  14
  15 class CC_EXPORT PictureLayerTilingSet {
  16  public:
  17   PictureLayerTilingSet(PictureLayerTilingClient* client,
  18                         const gfx::Size& layer_bounds);
  19   ~PictureLayerTilingSet();
  20
  21   void SetClient(PictureLayerTilingClient* client);
  22   const PictureLayerTilingClient* client() const { return client_; }
  23
  24   // Make this set of tilings match the same set of content scales from |other|.
  25   // Delete any tilings that don't meet |minimum_contents_scale|.  Recreate
  26   // any tiles that intersect |layer_invalidation|.  Update the size of all
  27   // tilings to |new_layer_bounds|.
  28   // Returns true if we had at least one high res tiling synced.
  29   bool SyncTilings(const PictureLayerTilingSet& other,
  30                    const gfx::Size& new_layer_bounds,
  31                    const Region& layer_invalidation,
  32                    float minimum_contents_scale);
  33
  34   void RemoveTilesInRegion(const Region& region);
  35
  36   gfx::Size layer_bounds() const { return layer_bounds_; }
  37
  38   void SetCanUseLCDText(bool can_use_lcd_text);
  39
  40   PictureLayerTiling* AddTiling(float contents_scale);
  41   size_t num_tilings() const { return tilings_.size(); }
  42   int NumHighResTilings() const;
  43   PictureLayerTiling* tiling_at(size_t idx) { return tilings_[idx]; }
  44   const PictureLayerTiling* tiling_at(size_t idx) const {
  45     return tilings_[idx];
  46   }
  47
  48   PictureLayerTiling* TilingAtScale(float scale) const;
  49
  50   // Remove all tilings.
  51   void RemoveAllTilings();
  52
  53   // Remove one tiling.
  54   void Remove(PictureLayerTiling* tiling);
  55
  56   // Remove all tiles; keep all tilings.
  57   void RemoveAllTiles();
  58
  59   void UpdateTilePriorities(WhichTree tree,
  60                             const gfx::Rect& visible_content_rect,
  61                             float layer_contents_scale,
  62                             double current_frame_time_in_seconds);
  63
  64   void DidBecomeActive();
  65   void DidBecomeRecycled();
  66
  67   // For a given rect, iterates through tiles that can fill it.  If no
  68   // set of tiles with resources can fill the rect, then it will iterate
  69   // through null tiles with valid geometry_rect() until the rect is full.
  70   // If all tiles have resources, the union of all geometry_rects will
  71   // exactly fill rect with no overlap.
  72   class CC_EXPORT CoverageIterator {
  73    public:
  74     CoverageIterator(const PictureLayerTilingSet* set,
  75       float contents_scale,
  76       const gfx::Rect& content_rect,
  77       float ideal_contents_scale);
  78     ~CoverageIterator();
  79
  80     // Visible rect (no borders), always in the space of rect,
  81     // regardless of the relative contents scale of the tiling.
  82     gfx::Rect geometry_rect() const;
  83     // Texture rect (in texels) for geometry_rect
  84     gfx::RectF texture_rect() const;
  85     // Texture size in texels
  86     gfx::Size texture_size() const;
  87
  88     Tile* operator->() const;
  89     Tile* operator*() const;
  90
  91     CoverageIterator& operator++();
  92     operator bool() const;
  93
  94     PictureLayerTiling* CurrentTiling();
  95
  96    private:
  97     int NextTiling() const;
  98
  99     const PictureLayerTilingSet* set_;
 100     float contents_scale_;
 101     float ideal_contents_scale_;
 102     PictureLayerTiling::CoverageIterator tiling_iter_;
 103     int current_tiling_;
 104     int ideal_tiling_;
 105
 106     Region current_region_;
 107     Region missing_region_;
 108     Region::Iterator region_iter_;
 109   };
 110
 111   scoped_ptr<base::Value> AsValue() const;
 112   size_t GPUMemoryUsageInBytes() const;
 113
 114  private:
 115   PictureLayerTilingClient* client_;
 116   gfx::Size layer_bounds_;
 117   ScopedPtrVector<PictureLayerTiling> tilings_;
 118
 119   friend class Iterator;
 120   DISALLOW_COPY_AND_ASSIGN(PictureLayerTilingSet);
 121 };
 122
 123 }  // namespace cc
 124
 125 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_