src/cc/resources/picture_layer_tiling_set.cc

   1 // Copyright 2012 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/resources/picture_layer_tiling_set.h"
   6
   7 #include <limits>
   8
   9 namespace cc {
  10
  11 namespace {
  12
  13 class LargestToSmallestScaleFunctor {
  14  public:
  15   bool operator() (PictureLayerTiling* left, PictureLayerTiling* right) {
  16     return left->contents_scale() > right->contents_scale();
  17   }
  18 };
  19
  20 }  // namespace
  21
  22
  23 PictureLayerTilingSet::PictureLayerTilingSet(
  24     PictureLayerTilingClient* client,
  25     gfx::Size layer_bounds)
  26     : client_(client),
  27       layer_bounds_(layer_bounds) {
  28 }
  29
  30 PictureLayerTilingSet::~PictureLayerTilingSet() {
  31 }
  32
  33 void PictureLayerTilingSet::SetClient(PictureLayerTilingClient* client) {
  34   client_ = client;
  35   for (size_t i = 0; i < tilings_.size(); ++i)
  36     tilings_[i]->SetClient(client_);
  37 }
  38
  39 void PictureLayerTilingSet::SyncTilings(
  40     const PictureLayerTilingSet& other,
  41     gfx::Size new_layer_bounds,
  42     const Region& layer_invalidation,
  43     float minimum_contents_scale) {
  44   if (new_layer_bounds.IsEmpty()) {
  45     RemoveAllTilings();
  46     layer_bounds_ = new_layer_bounds;
  47     return;
  48   }
  49
  50   tilings_.reserve(other.tilings_.size());
  51
  52   // Remove any tilings that aren't in |other| or don't meet the minimum.
  53   for (size_t i = 0; i < tilings_.size(); ++i) {
  54     float scale = tilings_[i]->contents_scale();
  55     if (scale >= minimum_contents_scale && !!other.TilingAtScale(scale))
  56       continue;
  57     // Swap with the last element and remove it.
  58     tilings_.swap(tilings_.begin() + i, tilings_.end() - 1);
  59     tilings_.pop_back();
  60     --i;
  61   }
  62
  63   // Add any missing tilings from |other| that meet the minimum.
  64   for (size_t i = 0; i < other.tilings_.size(); ++i) {
  65     float contents_scale = other.tilings_[i]->contents_scale();
  66     if (contents_scale < minimum_contents_scale)
  67       continue;
  68     if (PictureLayerTiling* this_tiling = TilingAtScale(contents_scale)) {
  69       this_tiling->set_resolution(other.tilings_[i]->resolution());
  70
  71       // These two calls must come before updating the pile, because they may
  72       // destroy tiles that the new pile cannot raster.
  73       this_tiling->SetLayerBounds(new_layer_bounds);
  74       this_tiling->Invalidate(layer_invalidation);
  75
  76       this_tiling->UpdateTilesToCurrentPile();
  77       this_tiling->CreateMissingTilesInLiveTilesRect();
  78
  79       DCHECK(this_tiling->tile_size() ==
  80              client_->CalculateTileSize(this_tiling->ContentRect().size()));
  81       continue;
  82     }
  83     scoped_ptr<PictureLayerTiling> new_tiling = PictureLayerTiling::Create(
  84         contents_scale,
  85         new_layer_bounds,
  86         client_);
  87     new_tiling->set_resolution(other.tilings_[i]->resolution());
  88     tilings_.push_back(new_tiling.Pass());
  89   }
  90   tilings_.sort(LargestToSmallestScaleFunctor());
  91
  92   layer_bounds_ = new_layer_bounds;
  93 }
  94
  95 void PictureLayerTilingSet::SetCanUseLCDText(bool can_use_lcd_text) {
  96   for (size_t i = 0; i < tilings_.size(); ++i)
  97     tilings_[i]->SetCanUseLCDText(can_use_lcd_text);
  98 }
  99
 100 PictureLayerTiling* PictureLayerTilingSet::AddTiling(float contents_scale) {
 101   for (size_t i = 0; i < tilings_.size(); ++i)
 102     DCHECK_NE(tilings_[i]->contents_scale(), contents_scale);
 103
 104   tilings_.push_back(PictureLayerTiling::Create(contents_scale,
 105                                                 layer_bounds_,
 106                                                 client_));
 107   PictureLayerTiling* appended = tilings_.back();
 108
 109   tilings_.sort(LargestToSmallestScaleFunctor());
 110   return appended;
 111 }
 112
 113 int PictureLayerTilingSet::NumHighResTilings() const {
 114   int num_high_res = 0;
 115   for (size_t i = 0; i < tilings_.size(); ++i) {
 116     if (tilings_[i]->resolution() == HIGH_RESOLUTION)
 117       num_high_res++;
 118   }
 119   return num_high_res;
 120 }
 121
 122 PictureLayerTiling* PictureLayerTilingSet::TilingAtScale(float scale) const {
 123   for (size_t i = 0; i < tilings_.size(); ++i) {
 124     if (tilings_[i]->contents_scale() == scale)
 125       return tilings_[i];
 126   }
 127   return NULL;
 128 }
 129
 130 void PictureLayerTilingSet::RemoveAllTilings() {
 131   tilings_.clear();
 132 }
 133
 134 void PictureLayerTilingSet::Remove(PictureLayerTiling* tiling) {
 135   ScopedPtrVector<PictureLayerTiling>::iterator iter =
 136     std::find(tilings_.begin(), tilings_.end(), tiling);
 137   if (iter == tilings_.end())
 138     return;
 139   tilings_.erase(iter);
 140 }
 141
 142 void PictureLayerTilingSet::RemoveAllTiles() {
 143   for (size_t i = 0; i < tilings_.size(); ++i)
 144     tilings_[i]->Reset();
 145 }
 146
 147 PictureLayerTilingSet::CoverageIterator::CoverageIterator(
 148     const PictureLayerTilingSet* set,
 149     float contents_scale,
 150     gfx::Rect content_rect,
 151     float ideal_contents_scale)
 152     : set_(set),
 153       contents_scale_(contents_scale),
 154       ideal_contents_scale_(ideal_contents_scale),
 155       current_tiling_(-1) {
 156   missing_region_.Union(content_rect);
 157
 158   for (ideal_tiling_ = 0;
 159        static_cast<size_t>(ideal_tiling_) < set_->tilings_.size();
 160        ++ideal_tiling_) {
 161     PictureLayerTiling* tiling = set_->tilings_[ideal_tiling_];
 162     if (tiling->contents_scale() < ideal_contents_scale_) {
 163       if (ideal_tiling_ > 0)
 164         ideal_tiling_--;
 165       break;
 166     }
 167   }
 168
 169   DCHECK_LE(set_->tilings_.size(),
 170             static_cast<size_t>(std::numeric_limits<int>::max()));
 171
 172   int num_tilings = set_->tilings_.size();
 173   if (ideal_tiling_ == num_tilings && ideal_tiling_ > 0)
 174     ideal_tiling_--;
 175
 176   ++(*this);
 177 }
 178
 179 PictureLayerTilingSet::CoverageIterator::~CoverageIterator() {
 180 }
 181
 182 gfx::Rect PictureLayerTilingSet::CoverageIterator::geometry_rect() const {
 183   if (!tiling_iter_) {
 184     if (!region_iter_.has_rect())
 185       return gfx::Rect();
 186     return region_iter_.rect();
 187   }
 188   return tiling_iter_.geometry_rect();
 189 }
 190
 191 gfx::RectF PictureLayerTilingSet::CoverageIterator::texture_rect() const {
 192   if (!tiling_iter_)
 193     return gfx::RectF();
 194   return tiling_iter_.texture_rect();
 195 }
 196
 197 gfx::Size PictureLayerTilingSet::CoverageIterator::texture_size() const {
 198   if (!tiling_iter_)
 199     return gfx::Size();
 200   return tiling_iter_.texture_size();
 201 }
 202
 203 Tile* PictureLayerTilingSet::CoverageIterator::operator->() const {
 204   if (!tiling_iter_)
 205     return NULL;
 206   return *tiling_iter_;
 207 }
 208
 209 Tile* PictureLayerTilingSet::CoverageIterator::operator*() const {
 210   if (!tiling_iter_)
 211     return NULL;
 212   return *tiling_iter_;
 213 }
 214
 215 PictureLayerTiling* PictureLayerTilingSet::CoverageIterator::CurrentTiling() {
 216   if (current_tiling_ < 0)
 217     return NULL;
 218   if (static_cast<size_t>(current_tiling_) >= set_->tilings_.size())
 219     return NULL;
 220   return set_->tilings_[current_tiling_];
 221 }
 222
 223 int PictureLayerTilingSet::CoverageIterator::NextTiling() const {
 224   // Order returned by this method is:
 225   // 1. Ideal tiling index
 226   // 2. Tiling index < Ideal in decreasing order (higher res than ideal)
 227   // 3. Tiling index > Ideal in increasing order (lower res than ideal)
 228   // 4. Tiling index > tilings.size() (invalid index)
 229   if (current_tiling_ < 0)
 230     return ideal_tiling_;
 231   else if (current_tiling_ > ideal_tiling_)
 232     return current_tiling_ + 1;
 233   else if (current_tiling_)
 234     return current_tiling_ - 1;
 235   else
 236     return ideal_tiling_ + 1;
 237 }
 238
 239 PictureLayerTilingSet::CoverageIterator&
 240 PictureLayerTilingSet::CoverageIterator::operator++() {
 241   bool first_time = current_tiling_ < 0;
 242
 243   if (!*this && !first_time)
 244     return *this;
 245
 246   if (tiling_iter_)
 247     ++tiling_iter_;
 248
 249   // Loop until we find a valid place to stop.
 250   while (true) {
 251     while (tiling_iter_ &&
 252            (!*tiling_iter_ || !tiling_iter_->IsReadyToDraw())) {
 253       missing_region_.Union(tiling_iter_.geometry_rect());
 254       ++tiling_iter_;
 255     }
 256     if (tiling_iter_)
 257       return *this;
 258
 259     // If the set of current rects for this tiling is done, go to the next
 260     // tiling and set up to iterate through all of the remaining holes.
 261     // This will also happen the first time through the loop.
 262     if (!region_iter_.has_rect()) {
 263       current_tiling_ = NextTiling();
 264       current_region_.Swap(&missing_region_);
 265       missing_region_.Clear();
 266       region_iter_ = Region::Iterator(current_region_);
 267
 268       // All done and all filled.
 269       if (!region_iter_.has_rect()) {
 270         current_tiling_ = set_->tilings_.size();
 271         return *this;
 272       }
 273
 274       // No more valid tiles, return this checkerboard rect.
 275       if (current_tiling_ >= static_cast<int>(set_->tilings_.size()))
 276         return *this;
 277     }
 278
 279     // Pop a rect off.  If there are no more tilings, then these will be
 280     // treated as geometry with null tiles that the caller can checkerboard.
 281     gfx::Rect last_rect = region_iter_.rect();
 282     region_iter_.next();
 283
 284     // Done, found next checkerboard rect to return.
 285     if (current_tiling_ >= static_cast<int>(set_->tilings_.size()))
 286       return *this;
 287
 288     // Construct a new iterator for the next tiling, but we need to loop
 289     // again until we get to a valid one.
 290     tiling_iter_ = PictureLayerTiling::CoverageIterator(
 291         set_->tilings_[current_tiling_],
 292         contents_scale_,
 293         last_rect);
 294   }
 295
 296   return *this;
 297 }
 298
 299 PictureLayerTilingSet::CoverageIterator::operator bool() const {
 300   return current_tiling_ < static_cast<int>(set_->tilings_.size()) ||
 301       region_iter_.has_rect();
 302 }
 303
 304 void PictureLayerTilingSet::UpdateTilePriorities(
 305     WhichTree tree,
 306     gfx::Size device_viewport,
 307     gfx::Rect viewport_in_content_space,
 308     gfx::Rect visible_content_rect,
 309     gfx::Size last_layer_bounds,
 310     gfx::Size current_layer_bounds,
 311     float last_layer_contents_scale,
 312     float current_layer_contents_scale,
 313     const gfx::Transform& last_screen_transform,
 314     const gfx::Transform& current_screen_transform,
 315     double current_frame_time_in_seconds,
 316     size_t max_tiles_for_interest_area) {
 317   gfx::Rect viewport_in_layer_space = gfx::ScaleToEnclosingRect(
 318       viewport_in_content_space,
 319       1.f / current_layer_contents_scale);
 320   gfx::Rect visible_layer_rect = gfx::ScaleToEnclosingRect(
 321       visible_content_rect,
 322       1.f / current_layer_contents_scale);
 323
 324   for (size_t i = 0; i < tilings_.size(); ++i) {
 325     tilings_[i]->UpdateTilePriorities(
 326         tree,
 327         device_viewport,
 328         viewport_in_layer_space,
 329         visible_layer_rect,
 330         last_layer_bounds,
 331         current_layer_bounds,
 332         last_layer_contents_scale,
 333         current_layer_contents_scale,
 334         last_screen_transform,
 335         current_screen_transform,
 336         current_frame_time_in_seconds,
 337         max_tiles_for_interest_area);
 338   }
 339 }
 340
 341 void PictureLayerTilingSet::DidBecomeActive() {
 342   for (size_t i = 0; i < tilings_.size(); ++i)
 343     tilings_[i]->DidBecomeActive();
 344 }
 345
 346 void PictureLayerTilingSet::DidBecomeRecycled() {
 347   for (size_t i = 0; i < tilings_.size(); ++i)
 348     tilings_[i]->DidBecomeRecycled();
 349 }
 350
 351 scoped_ptr<base::Value> PictureLayerTilingSet::AsValue() const {
 352   scoped_ptr<base::ListValue> state(new base::ListValue());
 353   for (size_t i = 0; i < tilings_.size(); ++i)
 354     state->Append(tilings_[i]->AsValue().release());
 355   return state.PassAs<base::Value>();
 356 }
 357
 358 size_t PictureLayerTilingSet::GPUMemoryUsageInBytes() const {
 359   size_t amount = 0;
 360   for (size_t i = 0; i < tilings_.size(); ++i)
 361     amount += tilings_[i]->GPUMemoryUsageInBytes();
 362   return amount;
 363 }
 364
 365 }  // namespace cc