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      1 // Copyright 2011 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_LAYER_TILING_DATA_H_
      6 #define CC_RESOURCES_LAYER_TILING_DATA_H_
      7 
      8 #include <utility>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/containers/hash_tables.h"
     12 #include "base/containers/scoped_ptr_hash_map.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "cc/base/cc_export.h"
     15 #include "cc/base/region.h"
     16 #include "cc/base/tiling_data.h"
     17 #include "ui/gfx/rect.h"
     18 
     19 namespace cc {
     20 
     21 class CC_EXPORT LayerTilingData {
     22  public:
     23   enum BorderTexelOption {
     24     HAS_BORDER_TEXELS,
     25     NO_BORDER_TEXELS
     26   };
     27 
     28   ~LayerTilingData();
     29 
     30   static scoped_ptr<LayerTilingData> Create(gfx::Size tile_size,
     31                                             BorderTexelOption option);
     32 
     33   bool has_empty_bounds() const { return tiling_data_.has_empty_bounds(); }
     34   int num_tiles_x() const { return tiling_data_.num_tiles_x(); }
     35   int num_tiles_y() const { return tiling_data_.num_tiles_y(); }
     36   gfx::Rect tile_bounds(int i, int j) const {
     37     return tiling_data_.TileBounds(i, j);
     38   }
     39   gfx::Vector2d texture_offset(int x_index, int y_index) const {
     40     return tiling_data_.TextureOffset(x_index, y_index);
     41   }
     42 
     43   // Change the tile size. This may invalidate all the existing tiles.
     44   void SetTileSize(gfx::Size size);
     45   gfx::Size tile_size() const;
     46   // Change the border texel setting. This may invalidate all existing tiles.
     47   void SetBorderTexelOption(BorderTexelOption option);
     48   bool has_border_texels() const { return !!tiling_data_.border_texels(); }
     49 
     50   bool is_empty() const { return has_empty_bounds() || !tiles().size(); }
     51 
     52   const LayerTilingData& operator=(const LayerTilingData&);
     53 
     54   class Tile {
     55    public:
     56     Tile() : i_(-1), j_(-1) {}
     57     virtual ~Tile() {}
     58 
     59     int i() const { return i_; }
     60     int j() const { return j_; }
     61     void move_to(int i, int j) {
     62       i_ = i;
     63       j_ = j;
     64     }
     65 
     66     gfx::Rect opaque_rect() const { return opaque_rect_; }
     67     void set_opaque_rect(gfx::Rect opaque_rect) { opaque_rect_ = opaque_rect; }
     68    private:
     69     int i_;
     70     int j_;
     71     gfx::Rect opaque_rect_;
     72     DISALLOW_COPY_AND_ASSIGN(Tile);
     73   };
     74   typedef std::pair<int, int> TileMapKey;
     75   typedef base::ScopedPtrHashMap<TileMapKey, Tile> TileMap;
     76 
     77   void AddTile(scoped_ptr<Tile> tile, int i, int j);
     78   scoped_ptr<Tile> TakeTile(int i, int j);
     79   Tile* TileAt(int i, int j) const;
     80   const TileMap& tiles() const { return tiles_; }
     81 
     82   void SetBounds(gfx::Size size);
     83   gfx::Size bounds() const { return tiling_data_.total_size(); }
     84 
     85   void ContentRectToTileIndices(gfx::Rect rect,
     86                                 int* left,
     87                                 int* top,
     88                                 int* right,
     89                                 int* bottom) const;
     90   gfx::Rect TileRect(const Tile* tile) const;
     91 
     92   Region OpaqueRegionInContentRect(gfx::Rect rect) const;
     93 
     94   void reset() { tiles_.clear(); }
     95 
     96  protected:
     97   LayerTilingData(gfx::Size tile_size, BorderTexelOption option);
     98 
     99   TileMap tiles_;
    100   TilingData tiling_data_;
    101 
    102   DISALLOW_COPY(LayerTilingData);
    103 };
    104 
    105 }  // namespace cc
    106 
    107 #endif  // CC_RESOURCES_LAYER_TILING_DATA_H_
    108