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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.
#ifndef CC_TILES_TILES_WITH_RESOURCE_ITERATOR_H_
#define CC_TILES_TILES_WITH_RESOURCE_ITERATOR_H_
#include <optional>
#include <set>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "cc/cc_export.h"
#include "cc/tiles/picture_layer_tiling.h"
#include "cc/tiles/prioritized_tile.h"
namespace cc {
class PictureLayerImpl;
class PictureLayerTilingSet;
// Iterates over all tiles that have a resource. The order of iteration is not
// defined.
class CC_EXPORT TilesWithResourceIterator {
public:
TilesWithResourceIterator(
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>*
picture_layers,
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>*
secondary_picture_layers);
TilesWithResourceIterator(const TilesWithResourceIterator&) = delete;
TilesWithResourceIterator& operator=(const TilesWithResourceIterator&) =
delete;
~TilesWithResourceIterator();
bool AtEnd() const;
void Next();
Tile* GetCurrent();
// Returns true if the current tile is occluded, false if at the end.
bool IsCurrentTileOccluded();
private:
// The following functions start iterating at the *current* location.
// Each function returns true if a match is found, false indicates there
// are no more items to iterate through.
bool FindNextInPictureLayers();
bool FindNextInActiveLayers();
bool FindNextInPictureLayerTilingSet();
bool FindNextInTileIterator();
PictureLayerTilingSet* CurrentPictureLayerTilingSet();
PictureLayerTiling* CurrentPictureLayerTiling();
// Iteration occurs over this vector first.
const raw_ptr<
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>>
picture_layers_;
// The secondary set of layers to iterate through, may be null.
const raw_ptr<
const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>>
secondary_picture_layers_;
// Indicates whether `active_layers_` is referencing `picture_layers_` or
// `secondary_picture_layers_`.
bool is_active_layers_secondary_layers_ = false;
raw_ptr<const std::vector<raw_ptr<PictureLayerImpl, VectorExperimental>>>
active_layers_;
// Index into `active_layers_` the current tile comes from.
size_t current_picture_layer_index_ = 0;
// Index into the current PictureLayerTilingSet the current tile comes from.
size_t current_picture_layer_tiling_index_ = 0;
// Iterates over the tiles from the current PictureLayerTiling. If this is
// not set, the end has been reached.
std::optional<PictureLayerTiling::TileIterator> tile_iterator_;
// Set of tiles that have been visited. Used to ensure the same tile isn't
// visited more than once.
std::set<raw_ptr<Tile, SetExperimental>> visited_;
};
} // namespace cc
#endif // CC_TILES_TILES_WITH_RESOURCE_ITERATOR_H_
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