cc/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_TILING_DATA_H_
   6 #define CC_TILING_DATA_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/logging.h"
  10 #include "cc/cc_export.h"
  11 #include "ui/gfx/size.h"
  12
  13 namespace gfx {
  14 class Rect;
  15 class Vector2d;
  16 }
  17
  18 namespace cc {
  19
  20 class CC_EXPORT TilingData {
  21  public:
  22   TilingData(gfx::Size max_texture_size, gfx::Size total_size, bool has_border_texels);
  23   ~TilingData();
  24
  25   gfx::Size total_size() const { return total_size_; }
  26   void SetTotalSize(const gfx::Size total_size);
  27
  28   gfx::Size max_texture_size() const { return max_texture_size_; }
  29   void SetMaxTextureSize(gfx::Size max_texture_size);
  30
  31   int border_texels() const { return border_texels_; }
  32   void SetHasBorderTexels(bool has_border_texels);
  33
  34   bool has_empty_bounds() const { return !num_tiles_x_ || !num_tiles_y_; }
  35   int num_tiles_x() const { return num_tiles_x_; }
  36   int num_tiles_y() const { return num_tiles_y_; }
  37   int TileXIndexFromSrcCoord(int src_position) const;
  38   int TileYIndexFromSrcCoord(int src_position) const;
  39
  40   gfx::Rect TileBounds(int i, int j) const;
  41   gfx::Rect TileBoundsWithBorder(int i, int j) const;
  42   int TilePositionX(int x_index) const;
  43   int TilePositionY(int y_index) const;
  44   int TileSizeX(int x_index) const;
  45   int TileSizeY(int y_index) const;
  46
  47   // Difference between TileBound's and TileBoundWithBorder's origin().
  48   gfx::Vector2d TextureOffset(int x_index, int y_index) const;
  49
  50  private:
  51   void AssertTile(int i, int j) const {
  52     DCHECK_GE(i,  0);
  53     DCHECK_LT(i, num_tiles_x_);
  54     DCHECK_GE(j, 0);
  55     DCHECK_LT(j, num_tiles_y_);
  56   }
  57
  58   void RecomputeNumTiles();
  59
  60   gfx::Size max_texture_size_;
  61   gfx::Size total_size_;
  62   // This value is always 0 or 1.
  63   int border_texels_;
  64
  65   // These are computed values.
  66   int num_tiles_x_;
  67   int num_tiles_y_;
  68 };
  69
  70 }  // namespace cc
  71
  72 #endif  // CC_TILING_DATA_H_