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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_COMMON_VIEW_TRANSITION_ELEMENT_RESOURCE_ID_H_
#define COMPONENTS_VIZ_COMMON_VIEW_TRANSITION_ELEMENT_RESOURCE_ID_H_
#include <stdint.h>
#include <cstdint>
#include <functional>
#include <string>
#include <tuple>
#include <unordered_map>
#include <utility>
#include "base/containers/flat_set.h"
#include "base/hash/hash.h"
#include "components/viz/common/viz_common_export.h"
#include "third_party/blink/public/common/tokens/tokens.h"
#include "ui/gfx/geometry/rect_f.h"
namespace viz {
// See view_transition_element_resource_id.mojom for details.
class VIZ_COMMON_EXPORT ViewTransitionElementResourceId {
public:
static constexpr uint32_t kInvalidLocalId = 0;
ViewTransitionElementResourceId(
const blink::ViewTransitionToken& transition_token,
uint32_t local_id,
bool for_subframe_snapshot);
// Creates an invalid id.
ViewTransitionElementResourceId();
~ViewTransitionElementResourceId();
VIZ_COMMON_EXPORT friend bool operator==(
const ViewTransitionElementResourceId&,
const ViewTransitionElementResourceId&);
friend auto operator<=>(const ViewTransitionElementResourceId&,
const ViewTransitionElementResourceId&) = default;
bool IsValid() const;
std::string ToString() const;
uint32_t local_id() const { return local_id_; }
const blink::ViewTransitionToken& transition_token() const {
CHECK(transition_token_);
return *transition_token_;
}
size_t Hash() const {
size_t token_hash = 0u;
if (transition_token_) {
token_hash = blink::ViewTransitionToken::Hasher()(*transition_token_);
}
return base::HashInts(token_hash, local_id_);
}
bool MatchesToken(
const base::flat_set<blink::ViewTransitionToken>& tokens) const;
bool for_subframe_snapshot() const { return for_subframe_snapshot_; }
private:
// Refers to a specific view transition - globally unique.
std::optional<blink::ViewTransitionToken> transition_token_;
// Refers to a specific snapshot resource within a specific transition
// Unique only with respect to a given `transition_token_`.
uint32_t local_id_ = kInvalidLocalId;
// If true, this resource id is generated for a subframe snapshot instead of
// other view transition elements.
bool for_subframe_snapshot_ = false;
};
using ViewTransitionElementResourceRects =
std::unordered_map<ViewTransitionElementResourceId, gfx::RectF>;
} // namespace viz
namespace std {
template <>
struct hash<viz::ViewTransitionElementResourceId> {
size_t operator()(
const viz::ViewTransitionElementResourceId& resource_id) const {
return resource_id.Hash();
}
};
} // namespace std
#endif // COMPONENTS_VIZ_COMMON_VIEW_TRANSITION_ELEMENT_RESOURCE_ID_H_
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