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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/resources/tiling_set_raster_queue_required.h"
#include <utility>
#include "cc/resources/picture_layer_tiling_set.h"
#include "cc/resources/tile.h"
#include "cc/resources/tile_priority.h"
namespace cc {
TilingSetRasterQueueRequired::TilingSetRasterQueueRequired(
PictureLayerTilingSet* tiling_set,
RasterTilePriorityQueue::Type type)
: type_(type) {
DCHECK_NE(static_cast<int>(type),
static_cast<int>(RasterTilePriorityQueue::Type::ALL));
// Required tiles should only come from HIGH_RESOLUTION tilings. However, if
// we want required for activation tiles on the active tree, then it will come
// from tilings whose pending twin is high resolution.
PictureLayerTiling* tiling = nullptr;
if (type == RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION &&
tiling_set->client()->GetTree() == ACTIVE_TREE) {
for (size_t i = 0; i < tiling_set->num_tilings(); ++i) {
PictureLayerTiling* active_tiling = tiling_set->tiling_at(i);
const PictureLayerTiling* pending_twin =
tiling_set->client()->GetPendingOrActiveTwinTiling(active_tiling);
if (pending_twin && pending_twin->resolution() == HIGH_RESOLUTION) {
tiling = active_tiling;
break;
}
}
} else {
tiling = tiling_set->FindTilingWithResolution(HIGH_RESOLUTION);
}
// If we don't have a tiling, then this queue will yield no tiles. See
// PictureLayerImpl::CanHaveTilings for examples of when a HIGH_RESOLUTION
// tiling would not be generated.
if (!tiling)
return;
if (type == RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION) {
iterator_ = TilingIterator(tiling, &tiling->tiling_data_,
tiling->pending_visible_rect());
} else {
iterator_ = TilingIterator(tiling, &tiling->tiling_data_,
tiling->current_visible_rect());
}
while (!iterator_.done() && !IsTileRequired(*iterator_))
++iterator_;
}
TilingSetRasterQueueRequired::~TilingSetRasterQueueRequired() {
}
bool TilingSetRasterQueueRequired::IsEmpty() const {
return iterator_.done();
}
void TilingSetRasterQueueRequired::Pop() {
DCHECK(!IsEmpty());
++iterator_;
while (!iterator_.done() && !IsTileRequired(*iterator_))
++iterator_;
}
Tile* TilingSetRasterQueueRequired::Top() {
DCHECK(!IsEmpty());
return *iterator_;
}
const Tile* TilingSetRasterQueueRequired::Top() const {
DCHECK(!IsEmpty());
return *iterator_;
}
bool TilingSetRasterQueueRequired::IsTileRequired(const Tile* tile) const {
return (type_ == RasterTilePriorityQueue::Type::REQUIRED_FOR_ACTIVATION &&
tile->required_for_activation()) ||
(type_ == RasterTilePriorityQueue::Type::REQUIRED_FOR_DRAW &&
tile->required_for_draw());
}
TilingSetRasterQueueRequired::TilingIterator::TilingIterator()
: tiling_(nullptr), current_tile_(nullptr) {
}
TilingSetRasterQueueRequired::TilingIterator::TilingIterator(
PictureLayerTiling* tiling,
TilingData* tiling_data,
const gfx::Rect& rect)
: tiling_(tiling), tiling_data_(tiling_data), current_tile_(nullptr) {
visible_iterator_ =
TilingData::Iterator(tiling_data_, rect, false /* include_borders */);
if (!visible_iterator_)
return;
current_tile_ =
tiling_->TileAt(visible_iterator_.index_x(), visible_iterator_.index_y());
// If this is a valid tile, return it. Note that we have to use a tiling check
// for occlusion, since the tile's internal state has not yet been updated.
if (current_tile_ && current_tile_->NeedsRaster() &&
!tiling_->IsTileOccluded(current_tile_)) {
tiling_->UpdateTileAndTwinPriority(current_tile_);
return;
}
++(*this);
}
TilingSetRasterQueueRequired::TilingIterator::~TilingIterator() {
}
TilingSetRasterQueueRequired::TilingIterator&
TilingSetRasterQueueRequired::TilingIterator::
operator++() {
while (true) {
++visible_iterator_;
if (!visible_iterator_) {
current_tile_ = nullptr;
return *this;
}
std::pair<int, int> next_index = visible_iterator_.index();
current_tile_ = tiling_->TileAt(next_index.first, next_index.second);
// If the tile doesn't exist or if it exists but doesn't need raster work,
// we can move on to the next tile.
if (!current_tile_ || !current_tile_->NeedsRaster())
continue;
// If the tile is occluded, we also can skip it. Note that we use the tiling
// check for occlusion, since tile's internal state has not yet been updated
// (by UpdateTileAndTwinPriority). The tiling check does not rely on tile's
// internal state (it is, in fact, used to determine the tile's state).
if (tiling_->IsTileOccluded(current_tile_))
continue;
// If we get here, that means we have a valid tile that needs raster and is
// in the NOW bin, which means that it can be required.
break;
}
if (current_tile_)
tiling_->UpdateTileAndTwinPriority(current_tile_);
return *this;
}
} // namespace cc
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