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/simple_enclosed_region.h"
16#include "cc/base/tiling_data.h"
17#include "ui/gfx/rect.h"
18
19namespace cc {
20
21class 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(const 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(const 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   private:
67    int i_;
68    int j_;
69    DISALLOW_COPY_AND_ASSIGN(Tile);
70  };
71  typedef std::pair<int, int> TileMapKey;
72  typedef base::ScopedPtrHashMap<TileMapKey, Tile> TileMap;
73
74  void AddTile(scoped_ptr<Tile> tile, int i, int j);
75  scoped_ptr<Tile> TakeTile(int i, int j);
76  Tile* TileAt(int i, int j) const;
77  const TileMap& tiles() const { return tiles_; }
78
79  void SetTilingSize(const gfx::Size& tiling_size);
80  gfx::Size tiling_size() const { return tiling_data_.tiling_size(); }
81
82  void ContentRectToTileIndices(const gfx::Rect& rect,
83                                int* left,
84                                int* top,
85                                int* right,
86                                int* bottom) const;
87  gfx::Rect TileRect(const Tile* tile) const;
88
89  void reset() { tiles_.clear(); }
90
91 protected:
92  LayerTilingData(const gfx::Size& tile_size, BorderTexelOption option);
93
94  TileMap tiles_;
95  TilingData tiling_data_;
96
97  DISALLOW_COPY(LayerTilingData);
98};
99
100}  // namespace cc
101
102#endif  // CC_RESOURCES_LAYER_TILING_DATA_H_
103