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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/tiles/tiles_with_resource_iterator.h"
#include "base/memory/raw_ptr.h"
#include "cc/layers/picture_layer_impl.h"
#include "cc/tiles/picture_layer_tiling_set.h"
namespace cc {
TilesWithResourceIterator::TilesWithResourceIterator(
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>*
picture_layers,
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>*
secondary_picture_layers)
: picture_layers_(picture_layers),
secondary_picture_layers_(secondary_picture_layers),
active_layers_(picture_layers) {
FindNextInPictureLayers();
}
TilesWithResourceIterator::~TilesWithResourceIterator() = default;
bool TilesWithResourceIterator::AtEnd() const {
return !tile_iterator_.has_value();
}
Tile* TilesWithResourceIterator::GetCurrent() {
return AtEnd() ? nullptr : tile_iterator_->GetCurrent();
}
bool TilesWithResourceIterator::IsCurrentTileOccluded() {
Tile* tile = GetCurrent();
return tile && tile->tiling()->IsTileOccluded(tile);
}
void TilesWithResourceIterator::Next() {
if (AtEnd())
return;
DCHECK(tile_iterator_);
tile_iterator_->Next();
if (FindNextInTileIterator())
return;
++current_picture_layer_tiling_index_;
if (FindNextInPictureLayerTilingSet())
return;
++current_picture_layer_index_;
if (FindNextInPictureLayers())
return;
// At the end.
DCHECK(AtEnd());
}
bool TilesWithResourceIterator::FindNextInPictureLayers() {
if (FindNextInActiveLayers())
return true;
DCHECK(AtEnd());
if (is_active_layers_secondary_layers_)
return false;
// Finished iterating through primary picture layers. Start iterating
// through secondary layers.
is_active_layers_secondary_layers_ = true;
active_layers_ = secondary_picture_layers_;
if (!active_layers_)
return false;
current_picture_layer_index_ = 0;
return FindNextInActiveLayers();
}
bool TilesWithResourceIterator::FindNextInActiveLayers() {
for (; current_picture_layer_index_ < active_layers_->size();
++current_picture_layer_index_) {
current_picture_layer_tiling_index_ = 0u;
if (FindNextInPictureLayerTilingSet())
return true;
}
// No more tiles to look at. Reset `tile_iterator_` so that AtEnd() returns
// true.
tile_iterator_.reset();
return false;
}
bool TilesWithResourceIterator::FindNextInPictureLayerTilingSet() {
PictureLayerTilingSet* tiling_set = CurrentPictureLayerTilingSet();
for (; current_picture_layer_tiling_index_ < tiling_set->num_tilings();
++current_picture_layer_tiling_index_) {
tile_iterator_.emplace(CurrentPictureLayerTiling());
if (FindNextInTileIterator())
return true;
++current_picture_layer_tiling_index_;
}
return false;
}
bool TilesWithResourceIterator::FindNextInTileIterator() {
for (; !tile_iterator_->AtEnd(); tile_iterator_->Next()) {
Tile* tile = tile_iterator_->GetCurrent();
if (visited_.insert(tile).second && tile->draw_info().has_resource())
return true;
}
return false;
}
PictureLayerTilingSet*
TilesWithResourceIterator::CurrentPictureLayerTilingSet() {
return (*active_layers_)[current_picture_layer_index_]
->picture_layer_tiling_set();
}
PictureLayerTiling* TilesWithResourceIterator::CurrentPictureLayerTiling() {
return CurrentPictureLayerTilingSet()->tiling_at(
current_picture_layer_tiling_index_);
}
} // namespace cc
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