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