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      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                         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   void SyncTilings(
     29      const PictureLayerTilingSet& other,
     30      gfx::Size new_layer_bounds,
     31      const Region& layer_invalidation,
     32      float minimum_contents_scale);
     33 
     34   gfx::Size layer_bounds() const { return layer_bounds_; }
     35 
     36   void SetCanUseLCDText(bool can_use_lcd_text);
     37 
     38   PictureLayerTiling* AddTiling(float contents_scale);
     39   size_t num_tilings() const { return tilings_.size(); }
     40   PictureLayerTiling* tiling_at(size_t idx) { return tilings_[idx]; }
     41   const PictureLayerTiling* tiling_at(size_t idx) const {
     42     return tilings_[idx];
     43   }
     44 
     45   PictureLayerTiling* TilingAtScale(float scale) const;
     46 
     47   // Remove all tilings.
     48   void RemoveAllTilings();
     49 
     50   // Remove one tiling.
     51   void Remove(PictureLayerTiling* tiling);
     52 
     53   // Remove all tiles; keep all tilings.
     54   void RemoveAllTiles();
     55 
     56   void UpdateTilePriorities(
     57       WhichTree tree,
     58       gfx::Size device_viewport,
     59       gfx::Rect viewport_in_content_space,
     60       gfx::Rect visible_content_rect,
     61       gfx::Size last_layer_bounds,
     62       gfx::Size current_layer_bounds,
     63       float last_layer_contents_scale,
     64       float current_layer_contents_scale,
     65       const gfx::Transform& last_screen_transform,
     66       const gfx::Transform& current_screen_transform,
     67       double current_frame_time_in_seconds,
     68       size_t max_tiles_for_interest_area);
     69 
     70   void DidBecomeActive();
     71 
     72   // For a given rect, iterates through tiles that can fill it.  If no
     73   // set of tiles with resources can fill the rect, then it will iterate
     74   // through null tiles with valid geometry_rect() until the rect is full.
     75   // If all tiles have resources, the union of all geometry_rects will
     76   // exactly fill rect with no overlap.
     77   class CC_EXPORT CoverageIterator {
     78    public:
     79     CoverageIterator(const PictureLayerTilingSet* set,
     80       float contents_scale,
     81       gfx::Rect content_rect,
     82       float ideal_contents_scale);
     83     ~CoverageIterator();
     84 
     85     // Visible rect (no borders), always in the space of rect,
     86     // regardless of the relative contents scale of the tiling.
     87     gfx::Rect geometry_rect() const;
     88     // Texture rect (in texels) for geometry_rect
     89     gfx::RectF texture_rect() const;
     90     // Texture size in texels
     91     gfx::Size texture_size() const;
     92 
     93     Tile* operator->() const;
     94     Tile* operator*() const;
     95 
     96     CoverageIterator& operator++();
     97     operator bool() const;
     98 
     99     PictureLayerTiling* CurrentTiling();
    100 
    101    private:
    102     int NextTiling() const;
    103 
    104     const PictureLayerTilingSet* set_;
    105     float contents_scale_;
    106     float ideal_contents_scale_;
    107     PictureLayerTiling::CoverageIterator tiling_iter_;
    108     int current_tiling_;
    109     int ideal_tiling_;
    110 
    111     Region current_region_;
    112     Region missing_region_;
    113     Region::Iterator region_iter_;
    114   };
    115 
    116   scoped_ptr<base::Value> AsValue() const;
    117   size_t GPUMemoryUsageInBytes() const;
    118 
    119  private:
    120   PictureLayerTilingClient* client_;
    121   gfx::Size layer_bounds_;
    122   ScopedPtrVector<PictureLayerTiling> tilings_;
    123 
    124   friend class Iterator;
    125   DISALLOW_COPY_AND_ASSIGN(PictureLayerTilingSet);
    126 };
    127 
    128 }  // namespace cc
    129 
    130 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_SET_H_
    131