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(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     explicit BaseIterator(const TilingData* tiling_data);
  80     void done() {
  81       index_x_ = -1;
  82       index_y_ = -1;
  83     }
  84
  85     const TilingData* tiling_data_;
  86     int index_x_;
  87     int index_y_;
  88   };
  89
  90   // Iterate through tiles whose bounds + optional border intersect with |rect|.
  91   class CC_EXPORT Iterator : public BaseIterator {
  92    public:
  93     Iterator();
  94     Iterator(const TilingData* tiling_data,
  95              const gfx::Rect& consider_rect,
  96              bool include_borders);
  97     Iterator& operator++();
  98
  99    private:
 100     int left_;
 101     int right_;
 102     int bottom_;
 103   };
 104
 105   // Iterate through all indices whose bounds (not including borders) intersect
 106   // with |consider| but which also do not intersect with |ignore|.
 107   class CC_EXPORT DifferenceIterator : public BaseIterator {
 108    public:
 109     DifferenceIterator(const TilingData* tiling_data,
 110                        const gfx::Rect& consider_rect,
 111                        const gfx::Rect& ignore_rect);
 112     DifferenceIterator& operator++();
 113
 114    private:
 115     bool in_ignore_rect() const {
 116      return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 117        index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 118     }
 119
 120     int consider_left_;
 121     int consider_top_;
 122     int consider_right_;
 123     int consider_bottom_;
 124     int ignore_left_;
 125     int ignore_top_;
 126     int ignore_right_;
 127     int ignore_bottom_;
 128   };
 129
 130   // Iterate through all indices whose bounds + border intersect with
 131   // |consider| but which also do not intersect with |ignore|. The iterator
 132   // order is a counterclockwise spiral around the given center.
 133   class CC_EXPORT SpiralDifferenceIterator : public BaseIterator {
 134    public:
 135     SpiralDifferenceIterator();
 136     SpiralDifferenceIterator(const TilingData* tiling_data,
 137                              const gfx::Rect& consider_rect,
 138                              const gfx::Rect& ignore_rect,
 139                              const gfx::Rect& center_rect);
 140     SpiralDifferenceIterator& operator++();
 141
 142    private:
 143     bool in_consider_rect() const {
 144       return index_x_ >= consider_left_ && index_x_ <= consider_right_ &&
 145              index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 146     }
 147     bool in_ignore_rect() const {
 148       return index_x_ >= ignore_left_ && index_x_ <= ignore_right_ &&
 149              index_y_ >= ignore_top_ && index_y_ <= ignore_bottom_;
 150     }
 151     bool valid_column() const {
 152       return index_x_ >= consider_left_ && index_x_ <= consider_right_;
 153     }
 154     bool valid_row() const {
 155       return index_y_ >= consider_top_ && index_y_ <= consider_bottom_;
 156     }
 157
 158     int current_step_count() const {
 159       return (direction_ == UP || direction_ == DOWN) ? vertical_step_count_
 160                                                       : horizontal_step_count_;
 161     }
 162
 163     bool needs_direction_switch() const;
 164     void switch_direction();
 165
 166     int consider_left_;
 167     int consider_top_;
 168     int consider_right_;
 169     int consider_bottom_;
 170     int ignore_left_;
 171     int ignore_top_;
 172     int ignore_right_;
 173     int ignore_bottom_;
 174
 175     enum Direction { UP, LEFT, DOWN, RIGHT };
 176
 177     Direction direction_;
 178     int delta_x_;
 179     int delta_y_;
 180     int current_step_;
 181     int horizontal_step_count_;
 182     int vertical_step_count_;
 183   };
 184
 185  private:
 186   void AssertTile(int i, int j) const {
 187     DCHECK_GE(i,  0);
 188     DCHECK_LT(i, num_tiles_x_);
 189     DCHECK_GE(j, 0);
 190     DCHECK_LT(j, num_tiles_y_);
 191   }
 192
 193   void RecomputeNumTiles();
 194
 195   gfx::Size max_texture_size_;
 196   gfx::Size tiling_size_;
 197   int border_texels_;
 198
 199   // These are computed values.
 200   int num_tiles_x_;
 201   int num_tiles_y_;
 202 };
 203
 204 }  // namespace cc
 205
 206 #endif  // CC_BASE_TILING_DATA_H_