cc/base/tiling_data.h

   1 // Copyright 2010 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_BASE_TILING_DATA_H_
   6 #define CC_BASE_TILING_DATA_H_
   7
   8 #include <utility>
   9
  10 #include "base/basictypes.h"
  11 #include "base/logging.h"
  12 #include "cc/base/cc_export.h"
  13 #include "ui/gfx/rect.h"
  14 #include "ui/gfx/size.h"
  15
  16 namespace gfx {
  17 class Vector2d;
  18 }
  19
  20 namespace cc {
  21
  22 class CC_EXPORT TilingData {
  23  public:
  24   TilingData();
  25   TilingData(
  26       gfx::Size max_texture_size,
  27       gfx::Size total_size,
  28       bool has_border_texels);
  29   TilingData(
  30       gfx::Size max_texture_size,
  31       gfx::Size total_size,
  32       int border_texels);
  33
  34   gfx::Size total_size() const { return total_size_; }
  35   void SetTotalSize(const gfx::Size total_size);
  36
  37   gfx::Size max_texture_size() const { return max_texture_size_; }
  38   void SetMaxTextureSize(gfx::Size max_texture_size);
  39
  40   int border_texels() const { return border_texels_; }
  41   void SetHasBorderTexels(bool has_border_texels);
  42   void SetBorderTexels(int border_texels);
  43
  44   bool has_empty_bounds() const { return !num_tiles_x_ || !num_tiles_y_; }
  45   int num_tiles_x() const { return num_tiles_x_; }
  46   int num_tiles_y() const { return num_tiles_y_; }
  47   // Return the tile index whose non-border texels include src_position.
  48   int TileXIndexFromSrcCoord(int src_position) const;
  49   int TileYIndexFromSrcCoord(int src_position) const;
  50   // Return the lowest tile index whose border texels include src_position.
  51   int FirstBorderTileXIndexFromSrcCoord(int src_position) const;
  52   int FirstBorderTileYIndexFromSrcCoord(int src_position) const;
  53   // Return the highest tile index whose border texels include src_position.
  54   int LastBorderTileXIndexFromSrcCoord(int src_position) const;
  55   int LastBorderTileYIndexFromSrcCoord(int src_position) const;
  56
  57   gfx::Rect TileBounds(int i, int j) const;
  58   gfx::Rect TileBoundsWithBorder(int i, int j) const;
  59   int TilePositionX(int x_index) const;
  60   int TilePositionY(int y_index) const;
  61   int TileSizeX(int x_index) const;
  62   int TileSizeY(int y_index) const;
  63
  64   // Difference between TileBound's and TileBoundWithBorder's origin().
  65   gfx::Vector2d TextureOffset(int x_index, int y_index) const;
  66
  67   class CC_EXPORT BaseIterator {
  68    public:
  69     operator bool() const { return index_x_ != -1 && index_y_ != -1; }
  70
  71     int index_x() const { return index_x_; }
  72     int index_y() const { return index_y_; }
  73     std::pair<int, int> index() const {
  74      return std::make_pair(index_x_, index_y_);
  75     }
  76
  77    protected:
  78     explicit BaseIterator(const TilingData* tiling_data);
  79     void done() {
  80       index_x_ = -1;
  81       index_y_ = -1;
  82     }
  83
  84     const TilingData* tiling_data_;
  85     int index_x_;
  86     int index_y_;
  87   };
  88
  89   // Iterate through all indices whose bounds + border intersect with |rect|.
  90   class CC_EXPORT Iterator : public BaseIterator {
  91    public:
  92     Iterator(const TilingData* tiling_data, const gfx::Rect& tiling_rect);
  93     Iterator& operator++();
  94
  95    private:
  96     int left_;
  97     int right_;
  98     int bottom_;
  99   };
 100
 101   // Iterate through all indices whose bounds + border intersect with
 102   // |consider| but which also do not intersect with |ignore|.
 103   class CC_EXPORT DifferenceIterator : public BaseIterator {
 104    public:
 105     DifferenceIterator(
 106       const TilingData* tiling_data,
 107       const gfx::Rect& consider_rect,
 108       const gfx::Rect& ignore_rect);
 109     DifferenceIterator& operator++();
 110
 111    private:
 112     bool in_ignore_rect() const {
 113      return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 114        index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 115     }
 116
 117     int consider_left_;
 118     int consider_top_;
 119     int consider_right_;
 120     int consider_bottom_;
 121     int ignore_left_;
 122     int ignore_top_;
 123     int ignore_right_;
 124     int ignore_bottom_;
 125   };
 126
 127  private:
 128   void AssertTile(int i, int j) const {
 129     DCHECK_GE(i,  0);
 130     DCHECK_LT(i, num_tiles_x_);
 131     DCHECK_GE(j, 0);
 132     DCHECK_LT(j, num_tiles_y_);
 133   }
 134
 135   void RecomputeNumTiles();
 136
 137   gfx::Size max_texture_size_;
 138   gfx::Size total_size_;
 139   int border_texels_;
 140
 141   // These are computed values.
 142   int num_tiles_x_;
 143   int num_tiles_y_;
 144 };
 145
 146 }  // namespace cc
 147
 148 #endif  // CC_BASE_TILING_DATA_H_