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   class CC_EXPORT BaseDifferenceIterator : public BaseIterator {
 105    protected:
 106     BaseDifferenceIterator();
 107     BaseDifferenceIterator(const TilingData* tiling_data,
 108                            const gfx::Rect& consider_rect,
 109                            const gfx::Rect& ignore_rect);
 110
 111     bool HasConsiderRect() const;
 112     bool in_consider_rect() const {
 113       return index_x_ >= consider_left_ && index_x_ <= consider_right_ &&
 114              index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 115     }
 116     bool in_ignore_rect() const {
 117       return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 118              index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 119     }
 120
 121     int consider_left_;
 122     int consider_top_;
 123     int consider_right_;
 124     int consider_bottom_;
 125     int ignore_left_;
 126     int ignore_top_;
 127     int ignore_right_;
 128     int ignore_bottom_;
 129   };
 130
 131   // Iterate through all indices whose bounds (not including borders) intersect
 132   // with |consider| but which also do not intersect with |ignore|.
 133   class CC_EXPORT DifferenceIterator : public BaseDifferenceIterator {
 134    public:
 135     DifferenceIterator(const TilingData* tiling_data,
 136                        const gfx::Rect& consider_rect,
 137                        const gfx::Rect& ignore_rect);
 138     DifferenceIterator& operator++();
 139   };
 140
 141   // Iterate through all indices whose bounds + border intersect with
 142   // |consider| but which also do not intersect with |ignore|. The iterator
 143   // order is a counterclockwise spiral around the given center.
 144   class CC_EXPORT SpiralDifferenceIterator : public BaseDifferenceIterator {
 145    public:
 146     SpiralDifferenceIterator();
 147     SpiralDifferenceIterator(const TilingData* tiling_data,
 148                              const gfx::Rect& consider_rect,
 149                              const gfx::Rect& ignore_rect,
 150                              const gfx::Rect& center_rect);
 151     SpiralDifferenceIterator& operator++();
 152
 153    private:
 154     bool valid_column() const {
 155       return index_x_ >= consider_left_ && index_x_ <= consider_right_;
 156     }
 157     bool valid_row() const {
 158       return index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 159     }
 160
 161     int current_step_count() const {
 162       return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
 163                                                       : horizontal_step_count_;
 164     }
 165
 166     bool needs_direction_switch() const;
 167     void switch_direction();
 168
 169     enum Direction { UP, LEFT, DOWN, RIGHT };
 170
 171     Direction direction_;
 172     int delta_x_;
 173     int delta_y_;
 174     int current_step_;
 175     int horizontal_step_count_;
 176     int vertical_step_count_;
 177   };
 178
 179   class CC_EXPORT ReverseSpiralDifferenceIterator
 180       : public BaseDifferenceIterator {
 181    public:
 182     ReverseSpiralDifferenceIterator();
 183     ReverseSpiralDifferenceIterator(const TilingData* tiling_data,
 184                                     const gfx::Rect& consider_rect,
 185                                     const gfx::Rect& ignore_rect,
 186                                     const gfx::Rect& center_rect);
 187     ReverseSpiralDifferenceIterator& operator++();
 188
 189    private:
 190     bool in_around_rect() const {
 191       return index_x_ >= around_left_ && index_x_ <= around_right_ &&
 192              index_y_ >= around_top_ && index_y_ <= around_bottom_;
 193     }
 194     bool valid_column() const {
 195       return index_x_ >= consider_left_ && index_x_ <= consider_right_;
 196     }
 197     bool valid_row() const {
 198       return index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 199     }
 200
 201     int current_step_count() const {
 202       return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
 203                                                       : horizontal_step_count_;
 204     }
 205
 206     bool needs_direction_switch() const;
 207     void switch_direction();
 208
 209     int around_left_;
 210     int around_top_;
 211     int around_right_;
 212     int around_bottom_;
 213
 214     enum Direction { LEFT, UP, RIGHT, DOWN };
 215
 216     Direction direction_;
 217     int delta_x_;
 218     int delta_y_;
 219     int current_step_;
 220     int horizontal_step_count_;
 221     int vertical_step_count_;
 222   };
 223
 224  private:
 225   void AssertTile(int i, int j) const {
 226     DCHECK_GE(i,  0);
 227     DCHECK_LT(i, num_tiles_x_);
 228     DCHECK_GE(j, 0);
 229     DCHECK_LT(j, num_tiles_y_);
 230   }
 231
 232   void RecomputeNumTiles();
 233
 234   gfx::Size max_texture_size_;
 235   gfx::Size tiling_size_;
 236   int border_texels_;
 237
 238   // These are computed values.
 239   int num_tiles_x_;
 240   int num_tiles_y_;
 241 };
 242
 243 }  // namespace cc
 244
 245 #endif  // CC_BASE_TILING_DATA_H_