cc/base/tiling_data.cc

   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 #include "cc/base/tiling_data.h"
   6
   7 #include <algorithm>
   8
   9 #include "ui/gfx/rect.h"
  10 #include "ui/gfx/vector2d.h"
  11
  12 namespace cc {
  13
  14 static int ComputeNumTiles(int max_texture_size,
  15                            int total_size,
  16                            int border_texels) {
  17   if (max_texture_size - 2 * border_texels <= 0)
  18     return total_size > 0 && max_texture_size >= total_size ? 1 : 0;
  19
  20   int num_tiles = std::max(1,
  21                            1 + (total_size - 1 - 2 * border_texels) /
  22                            (max_texture_size - 2 * border_texels));
  23   return total_size > 0 ? num_tiles : 0;
  24 }
  25
  26 TilingData::TilingData()
  27     : border_texels_(0) {
  28   RecomputeNumTiles();
  29 }
  30
  31 TilingData::TilingData(
  32     gfx::Size max_texture_size,
  33     gfx::Size total_size,
  34     bool has_border_texels)
  35     : max_texture_size_(max_texture_size),
  36       total_size_(total_size),
  37       border_texels_(has_border_texels ? 1 : 0) {
  38   RecomputeNumTiles();
  39 }
  40
  41 TilingData::TilingData(
  42     gfx::Size max_texture_size,
  43     gfx::Size total_size,
  44     int border_texels)
  45     : max_texture_size_(max_texture_size),
  46       total_size_(total_size),
  47       border_texels_(border_texels) {
  48   RecomputeNumTiles();
  49 }
  50
  51 void TilingData::SetTotalSize(gfx::Size total_size) {
  52   total_size_ = total_size;
  53   RecomputeNumTiles();
  54 }
  55
  56 void TilingData::SetMaxTextureSize(gfx::Size max_texture_size) {
  57   max_texture_size_ = max_texture_size;
  58   RecomputeNumTiles();
  59 }
  60
  61 void TilingData::SetHasBorderTexels(bool has_border_texels) {
  62   border_texels_ = has_border_texels ? 1 : 0;
  63   RecomputeNumTiles();
  64 }
  65
  66 void TilingData::SetBorderTexels(int border_texels) {
  67   border_texels_ = border_texels;
  68   RecomputeNumTiles();
  69 }
  70
  71 int TilingData::TileXIndexFromSrcCoord(int src_position) const {
  72   if (num_tiles_x_ <= 1)
  73     return 0;
  74
  75   DCHECK_GT(max_texture_size_.width() - 2 * border_texels_, 0);
  76   int x = (src_position - border_texels_) /
  77       (max_texture_size_.width() - 2 * border_texels_);
  78   return std::min(std::max(x, 0), num_tiles_x_ - 1);
  79 }
  80
  81 int TilingData::TileYIndexFromSrcCoord(int src_position) const {
  82   if (num_tiles_y_ <= 1)
  83     return 0;
  84
  85   DCHECK_GT(max_texture_size_.height() - 2 * border_texels_, 0);
  86   int y = (src_position - border_texels_) /
  87       (max_texture_size_.height() - 2 * border_texels_);
  88   return std::min(std::max(y, 0), num_tiles_y_ - 1);
  89 }
  90
  91 int TilingData::FirstBorderTileXIndexFromSrcCoord(int src_position) const {
  92   if (num_tiles_x_ <= 1)
  93     return 0;
  94
  95   DCHECK_GT(max_texture_size_.width() - 2 * border_texels_, 0);
  96   int inner_tile_size = max_texture_size_.width() - 2 * border_texels_;
  97   int x = (src_position - 2 * border_texels_) / inner_tile_size;
  98   return std::min(std::max(x, 0), num_tiles_x_ - 1);
  99 }
 100
 101 int TilingData::FirstBorderTileYIndexFromSrcCoord(int src_position) const {
 102   if (num_tiles_y_ <= 1)
 103     return 0;
 104
 105   DCHECK_GT(max_texture_size_.height() - 2 * border_texels_, 0);
 106   int inner_tile_size = max_texture_size_.height() - 2 * border_texels_;
 107   int y = (src_position - 2 * border_texels_) / inner_tile_size;
 108   return std::min(std::max(y, 0), num_tiles_y_ - 1);
 109 }
 110
 111 int TilingData::LastBorderTileXIndexFromSrcCoord(int src_position) const {
 112   if (num_tiles_x_ <= 1)
 113     return 0;
 114
 115   DCHECK_GT(max_texture_size_.width() - 2 * border_texels_, 0);
 116   int inner_tile_size = max_texture_size_.width() - 2 * border_texels_;
 117   int x = src_position / inner_tile_size;
 118   return std::min(std::max(x, 0), num_tiles_x_ - 1);
 119 }
 120
 121 int TilingData::LastBorderTileYIndexFromSrcCoord(int src_position) const {
 122   if (num_tiles_y_ <= 1)
 123     return 0;
 124
 125   DCHECK_GT(max_texture_size_.height() - 2 * border_texels_, 0);
 126   int inner_tile_size = max_texture_size_.height() - 2 * border_texels_;
 127   int y = src_position / inner_tile_size;
 128   return std::min(std::max(y, 0), num_tiles_y_ - 1);
 129 }
 130
 131 gfx::Rect TilingData::TileBounds(int i, int j) const {
 132   AssertTile(i, j);
 133   int max_texture_size_x = max_texture_size_.width() - 2 * border_texels_;
 134   int max_texture_size_y = max_texture_size_.height() - 2 * border_texels_;
 135   int total_size_x = total_size_.width();
 136   int total_size_y = total_size_.height();
 137
 138   int lo_x = max_texture_size_x * i;
 139   if (i != 0)
 140     lo_x += border_texels_;
 141
 142   int lo_y = max_texture_size_y * j;
 143   if (j != 0)
 144     lo_y += border_texels_;
 145
 146   int hi_x = max_texture_size_x * (i + 1) + border_texels_;
 147   if (i + 1 == num_tiles_x_)
 148     hi_x += border_texels_;
 149
 150   int hi_y = max_texture_size_y * (j + 1) + border_texels_;
 151   if (j + 1 == num_tiles_y_)
 152     hi_y += border_texels_;
 153
 154   hi_x = std::min(hi_x, total_size_x);
 155   hi_y = std::min(hi_y, total_size_y);
 156
 157   int x = lo_x;
 158   int y = lo_y;
 159   int width = hi_x - lo_x;
 160   int height = hi_y - lo_y;
 161   DCHECK_GE(x, 0);
 162   DCHECK_GE(y, 0);
 163   DCHECK_GE(width, 0);
 164   DCHECK_GE(height, 0);
 165   DCHECK_LE(x, total_size_.width());
 166   DCHECK_LE(y, total_size_.height());
 167   return gfx::Rect(x, y, width, height);
 168 }
 169
 170 gfx::Rect TilingData::TileBoundsWithBorder(int i, int j) const {
 171   AssertTile(i, j);
 172   int max_texture_size_x = max_texture_size_.width() - 2 * border_texels_;
 173   int max_texture_size_y = max_texture_size_.height() - 2 * border_texels_;
 174   int total_size_x = total_size_.width();
 175   int total_size_y = total_size_.height();
 176
 177   int lo_x = max_texture_size_x * i;
 178   int lo_y = max_texture_size_y * j;
 179
 180   int hi_x = lo_x + max_texture_size_x + 2 * border_texels_;
 181   int hi_y = lo_y + max_texture_size_y + 2 * border_texels_;
 182
 183   hi_x = std::min(hi_x, total_size_x);
 184   hi_y = std::min(hi_y, total_size_y);
 185
 186   int x = lo_x;
 187   int y = lo_y;
 188   int width = hi_x - lo_x;
 189   int height = hi_y - lo_y;
 190   DCHECK_GE(x, 0);
 191   DCHECK_GE(y, 0);
 192   DCHECK_GE(width, 0);
 193   DCHECK_GE(height, 0);
 194   DCHECK_LE(x, total_size_.width());
 195   DCHECK_LE(y, total_size_.height());
 196   return gfx::Rect(x, y, width, height);
 197 }
 198
 199 int TilingData::TilePositionX(int x_index) const {
 200   DCHECK_GE(x_index, 0);
 201   DCHECK_LT(x_index, num_tiles_x_);
 202
 203   int pos = (max_texture_size_.width() - 2 * border_texels_) * x_index;
 204   if (x_index != 0)
 205     pos += border_texels_;
 206
 207   return pos;
 208 }
 209
 210 int TilingData::TilePositionY(int y_index) const {
 211   DCHECK_GE(y_index, 0);
 212   DCHECK_LT(y_index, num_tiles_y_);
 213
 214   int pos = (max_texture_size_.height() - 2 * border_texels_) * y_index;
 215   if (y_index != 0)
 216     pos += border_texels_;
 217
 218   return pos;
 219 }
 220
 221 int TilingData::TileSizeX(int x_index) const {
 222   DCHECK_GE(x_index, 0);
 223   DCHECK_LT(x_index, num_tiles_x_);
 224
 225   if (!x_index && num_tiles_x_ == 1)
 226     return total_size_.width();
 227   if (!x_index && num_tiles_x_ > 1)
 228     return max_texture_size_.width() - border_texels_;
 229   if (x_index < num_tiles_x_ - 1)
 230     return max_texture_size_.width() - 2 * border_texels_;
 231   if (x_index == num_tiles_x_ - 1)
 232     return total_size_.width() - TilePositionX(x_index);
 233
 234   NOTREACHED();
 235   return 0;
 236 }
 237
 238 int TilingData::TileSizeY(int y_index) const {
 239   DCHECK_GE(y_index, 0);
 240   DCHECK_LT(y_index, num_tiles_y_);
 241
 242   if (!y_index && num_tiles_y_ == 1)
 243     return total_size_.height();
 244   if (!y_index && num_tiles_y_ > 1)
 245     return max_texture_size_.height() - border_texels_;
 246   if (y_index < num_tiles_y_ - 1)
 247     return max_texture_size_.height() - 2 * border_texels_;
 248   if (y_index == num_tiles_y_ - 1)
 249     return total_size_.height() - TilePositionY(y_index);
 250
 251   NOTREACHED();
 252   return 0;
 253 }
 254
 255 gfx::Vector2d TilingData::TextureOffset(int x_index, int y_index) const {
 256   int left = (!x_index || num_tiles_x_ == 1) ? 0 : border_texels_;
 257   int top = (!y_index || num_tiles_y_ == 1) ? 0 : border_texels_;
 258
 259   return gfx::Vector2d(left, top);
 260 }
 261
 262 void TilingData::RecomputeNumTiles() {
 263   num_tiles_x_ = ComputeNumTiles(
 264       max_texture_size_.width(), total_size_.width(), border_texels_);
 265   num_tiles_y_ = ComputeNumTiles(
 266       max_texture_size_.height(), total_size_.height(), border_texels_);
 267 }
 268
 269 TilingData::BaseIterator::BaseIterator(const TilingData* tiling_data)
 270     : tiling_data_(tiling_data),
 271       index_x_(-1),
 272       index_y_(-1) {
 273 }
 274
 275 TilingData::Iterator::Iterator(const TilingData* tiling_data, gfx::Rect rect)
 276     : BaseIterator(tiling_data),
 277       left_(-1),
 278       right_(-1),
 279       bottom_(-1) {
 280   if (tiling_data_->num_tiles_x() <= 0 || tiling_data_->num_tiles_y() <= 0) {
 281     done();
 282     return;
 283   }
 284
 285   rect.Intersect(gfx::Rect(tiling_data_->total_size()));
 286   index_x_ = tiling_data_->FirstBorderTileXIndexFromSrcCoord(rect.x());
 287   index_y_ = tiling_data_->FirstBorderTileYIndexFromSrcCoord(rect.y());
 288   left_ = index_x_;
 289   right_ = tiling_data_->LastBorderTileXIndexFromSrcCoord(rect.right() - 1);
 290   bottom_ = tiling_data_->LastBorderTileYIndexFromSrcCoord(rect.bottom() - 1);
 291
 292   // Index functions always return valid indices, so explicitly check
 293   // for non-intersecting rects.
 294   gfx::Rect new_rect = tiling_data_->TileBoundsWithBorder(index_x_, index_y_);
 295   if (!new_rect.Intersects(rect))
 296     done();
 297 }
 298
 299 TilingData::Iterator& TilingData::Iterator::operator++() {
 300   if (!*this)
 301     return *this;
 302
 303   index_x_++;
 304   if (index_x_ > right_) {
 305     index_x_ = left_;
 306     index_y_++;
 307     if (index_y_ > bottom_)
 308       done();
 309   }
 310
 311   return *this;
 312 }
 313
 314 TilingData::DifferenceIterator::DifferenceIterator(
 315     const TilingData* tiling_data,
 316     gfx::Rect consider,
 317     gfx::Rect ignore)
 318     : BaseIterator(tiling_data),
 319       consider_left_(-1),
 320       consider_top_(-1),
 321       consider_right_(-1),
 322       consider_bottom_(-1),
 323       ignore_left_(-1),
 324       ignore_top_(-1),
 325       ignore_right_(-1),
 326       ignore_bottom_(-1) {
 327   if (tiling_data_->num_tiles_x() <= 0 || tiling_data_->num_tiles_y() <= 0) {
 328     done();
 329     return;
 330   }
 331
 332   gfx::Rect bounds(tiling_data_->total_size());
 333   consider.Intersect(bounds);
 334   ignore.Intersect(bounds);
 335   if (consider.IsEmpty()) {
 336     done();
 337     return;
 338   }
 339
 340   consider_left_ =
 341       tiling_data_->FirstBorderTileXIndexFromSrcCoord(consider.x());
 342   consider_top_ =
 343       tiling_data_->FirstBorderTileYIndexFromSrcCoord(consider.y());
 344   consider_right_ =
 345       tiling_data_->LastBorderTileXIndexFromSrcCoord(consider.right() - 1);
 346   consider_bottom_ =
 347       tiling_data_->LastBorderTileYIndexFromSrcCoord(consider.bottom() - 1);
 348
 349   if (!ignore.IsEmpty()) {
 350     ignore_left_ =
 351         tiling_data_->FirstBorderTileXIndexFromSrcCoord(ignore.x());
 352     ignore_top_ =
 353         tiling_data_->FirstBorderTileYIndexFromSrcCoord(ignore.y());
 354     ignore_right_ =
 355         tiling_data_->LastBorderTileXIndexFromSrcCoord(ignore.right() - 1);
 356     ignore_bottom_ =
 357         tiling_data_->LastBorderTileYIndexFromSrcCoord(ignore.bottom() - 1);
 358
 359     // Clamp ignore indices to consider indices.
 360     ignore_left_ = std::max(ignore_left_, consider_left_);
 361     ignore_top_ = std::max(ignore_top_, consider_top_);
 362     ignore_right_ = std::min(ignore_right_, consider_right_);
 363     ignore_bottom_ = std::min(ignore_bottom_, consider_bottom_);
 364   }
 365
 366   if (ignore_left_ == consider_left_ && ignore_right_ == consider_right_ &&
 367       ignore_top_ == consider_top_ && ignore_bottom_ == consider_bottom_) {
 368     done();
 369     return;
 370   }
 371
 372   index_x_ = consider_left_;
 373   index_y_ = consider_top_;
 374
 375   if (in_ignore_rect())
 376     ++(*this);
 377 }
 378
 379 TilingData::DifferenceIterator& TilingData::DifferenceIterator::operator++() {
 380   if (!*this)
 381     return *this;
 382
 383   index_x_++;
 384   if (in_ignore_rect())
 385     index_x_ = ignore_right_ + 1;
 386
 387   if (index_x_ > consider_right_) {
 388     index_x_ = consider_left_;
 389     index_y_++;
 390
 391     if (in_ignore_rect()) {
 392       index_x_ = ignore_right_ + 1;
 393       // If the ignore rect spans the whole consider rect horizontally, then
 394       // ignore_right + 1 will be out of bounds.
 395       if (in_ignore_rect() || index_x_ > consider_right_) {
 396         index_y_ = ignore_bottom_ + 1;
 397         index_x_ = consider_left_;
 398       }
 399     }
 400
 401     if (index_y_ > consider_bottom_)
 402       done();
 403   }
 404
 405   return *this;
 406 }
 407
 408 }  // namespace cc