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/geometry/rect.h"
  14 #include "ui/gfx/geometry/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(const gfx::Size& max_texture_size,
  26              const gfx::Size& tiling_size,
  27              bool has_border_texels);
  28   TilingData(const gfx::Size& max_texture_size,
  29              const gfx::Size& tiling_size,
  30              int border_texels);
  31
  32   gfx::Size tiling_size() const { return tiling_size_; }
  33   void SetTilingSize(const gfx::Size& tiling_size);
  34
  35   gfx::Size max_texture_size() const { return max_texture_size_; }
  36   void SetMaxTextureSize(const gfx::Size& max_texture_size);
  37
  38   int border_texels() const { return border_texels_; }
  39   void SetHasBorderTexels(bool has_border_texels);
  40   void SetBorderTexels(int border_texels);
  41
  42   bool has_empty_bounds() const { return !num_tiles_x_ || !num_tiles_y_; }
  43   int num_tiles_x() const { return num_tiles_x_; }
  44   int num_tiles_y() const { return num_tiles_y_; }
  45   // Return the tile index whose non-border texels include src_position.
  46   int TileXIndexFromSrcCoord(int src_position) const;
  47   int TileYIndexFromSrcCoord(int src_position) const;
  48   // Return the lowest tile index whose border texels include src_position.
  49   int FirstBorderTileXIndexFromSrcCoord(int src_position) const;
  50   int FirstBorderTileYIndexFromSrcCoord(int src_position) const;
  51   // Return the highest tile index whose border texels include src_position.
  52   int LastBorderTileXIndexFromSrcCoord(int src_position) const;
  53   int LastBorderTileYIndexFromSrcCoord(int src_position) const;
  54
  55   gfx::Rect ExpandRectIgnoringBordersToTileBounds(const gfx::Rect& rect) const;
  56   gfx::Rect ExpandRectToTileBounds(const gfx::Rect& rect) const;
  57
  58   gfx::Rect TileBounds(int i, int j) const;
  59   gfx::Rect TileBoundsWithBorder(int i, int j) const;
  60   int TilePositionX(int x_index) const;
  61   int TilePositionY(int y_index) const;
  62   int TileSizeX(int x_index) const;
  63   int TileSizeY(int y_index) const;
  64
  65   // Difference between TileBound's and TileBoundWithBorder's origin().
  66   gfx::Vector2d TextureOffset(int x_index, int y_index) const;
  67
  68   class CC_EXPORT BaseIterator {
  69    public:
  70     operator bool() const { return index_x_ != -1 && index_y_ != -1; }
  71
  72     int index_x() const { return index_x_; }
  73     int index_y() const { return index_y_; }
  74     std::pair<int, int> index() const {
  75      return std::make_pair(index_x_, index_y_);
  76     }
  77
  78    protected:
  79     BaseIterator();
  80     void done() {
  81       index_x_ = -1;
  82       index_y_ = -1;
  83     }
  84
  85     int index_x_;
  86     int index_y_;
  87   };
  88
  89   // Iterate through tiles whose bounds + optional border intersect with |rect|.
  90   class CC_EXPORT Iterator : public BaseIterator {
  91    public:
  92     Iterator();
  93     Iterator(const TilingData* tiling_data,
  94              const gfx::Rect& consider_rect,
  95              bool include_borders);
  96     Iterator& operator++();
  97
  98    private:
  99     int left_;
 100     int right_;
 101     int bottom_;
 102   };
 103
 104   // Iterate through all indices whose bounds (not including borders) intersect
 105   // with |consider| but which also do not intersect with |ignore|.
 106   class CC_EXPORT DifferenceIterator : public BaseIterator {
 107    public:
 108     DifferenceIterator(const TilingData* tiling_data,
 109                        const gfx::Rect& consider_rect,
 110                        const gfx::Rect& ignore_rect);
 111     DifferenceIterator& operator++();
 112
 113    private:
 114     bool in_ignore_rect() const {
 115      return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 116        index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 117     }
 118
 119     int consider_left_;
 120     int consider_top_;
 121     int consider_right_;
 122     int consider_bottom_;
 123     int ignore_left_;
 124     int ignore_top_;
 125     int ignore_right_;
 126     int ignore_bottom_;
 127   };
 128
 129   // Iterate through all indices whose bounds + border intersect with
 130   // |consider| but which also do not intersect with |ignore|. The iterator
 131   // order is a counterclockwise spiral around the given center.
 132   class CC_EXPORT SpiralDifferenceIterator : public BaseIterator {
 133    public:
 134     SpiralDifferenceIterator();
 135     SpiralDifferenceIterator(const TilingData* tiling_data,
 136                              const gfx::Rect& consider_rect,
 137                              const gfx::Rect& ignore_rect,
 138                              const gfx::Rect& center_rect);
 139     SpiralDifferenceIterator& operator++();
 140
 141    private:
 142     bool in_consider_rect() const {
 143       return index_x_ >= consider_left_ && index_x_ <= consider_right_ &&
 144              index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 145     }
 146     bool in_ignore_rect() const {
 147       return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 148              index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 149     }
 150     bool valid_column() const {
 151       return index_x_ >= consider_left_ && index_x_ <= consider_right_;
 152     }
 153     bool valid_row() const {
 154       return index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 155     }
 156
 157     int current_step_count() const {
 158       return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
 159                                                       : horizontal_step_count_;
 160     }
 161
 162     bool needs_direction_switch() const;
 163     void switch_direction();
 164
 165     int consider_left_;
 166     int consider_top_;
 167     int consider_right_;
 168     int consider_bottom_;
 169     int ignore_left_;
 170     int ignore_top_;
 171     int ignore_right_;
 172     int ignore_bottom_;
 173
 174     enum Direction { UP, LEFT, DOWN, RIGHT };
 175
 176     Direction direction_;
 177     int delta_x_;
 178     int delta_y_;
 179     int current_step_;
 180     int horizontal_step_count_;
 181     int vertical_step_count_;
 182   };
 183
 184   class CC_EXPORT ReverseSpiralDifferenceIterator : public BaseIterator {
 185    public:
 186     ReverseSpiralDifferenceIterator();
 187     ReverseSpiralDifferenceIterator(const TilingData* tiling_data,
 188                                     const gfx::Rect& consider_rect,
 189                                     const gfx::Rect& ignore_rect,
 190                                     const gfx::Rect& center_rect);
 191     ReverseSpiralDifferenceIterator& operator++();
 192
 193    private:
 194     bool in_consider_rect() const {
 195       return index_x_ >= consider_left_ && index_x_ <= consider_right_ &&
 196              index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 197     }
 198     bool in_around_rect() const {
 199       return index_x_ >= around_left_ && index_x_ <= around_right_ &&
 200              index_y_ >= around_top_ && index_y_ <= around_bottom_;
 201     }
 202     bool in_ignore_rect() const {
 203       return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 204              index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 205     }
 206     bool valid_column() const {
 207       return index_x_ >= consider_left_ && index_x_ <= consider_right_;
 208     }
 209     bool valid_row() const {
 210       return index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 211     }
 212
 213     int current_step_count() const {
 214       return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
 215                                                       : horizontal_step_count_;
 216     }
 217
 218     bool needs_direction_switch() const;
 219     void switch_direction();
 220
 221     int consider_left_;
 222     int consider_top_;
 223     int consider_right_;
 224     int consider_bottom_;
 225     int around_left_;
 226     int around_top_;
 227     int around_right_;
 228     int around_bottom_;
 229     int ignore_left_;
 230     int ignore_top_;
 231     int ignore_right_;
 232     int ignore_bottom_;
 233
 234     enum Direction { LEFT, UP, RIGHT, DOWN };
 235
 236     Direction direction_;
 237     int delta_x_;
 238     int delta_y_;
 239     int current_step_;
 240     int horizontal_step_count_;
 241     int vertical_step_count_;
 242   };
 243
 244  private:
 245   void AssertTile(int i, int j) const {
 246     DCHECK_GE(i,  0);
 247     DCHECK_LT(i, num_tiles_x_);
 248     DCHECK_GE(j, 0);
 249     DCHECK_LT(j, num_tiles_y_);
 250   }
 251
 252   void RecomputeNumTiles();
 253
 254   gfx::Size max_texture_size_;
 255   gfx::Size tiling_size_;
 256   int border_texels_;
 257
 258   // These are computed values.
 259   int num_tiles_x_;
 260   int num_tiles_y_;
 261 };
 262
 263 }  // namespace cc
 264
 265 #endif  // CC_BASE_TILING_DATA_H_