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// Copyright 2016 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_SERVICE_SURFACES_SURFACE_REFERENCE_H_
#define COMPONENTS_VIZ_SERVICE_SURFACES_SURFACE_REFERENCE_H_
#include <compare>
#include <string>
#include "base/hash/hash.h"
#include "components/viz/common/surfaces/surface_id.h"
#include "components/viz/service/viz_service_export.h"
namespace viz {
// Hold a reference from an embedding (parent) to embedded (child) surface.
class VIZ_SERVICE_EXPORT SurfaceReference {
public:
SurfaceReference();
SurfaceReference(const SurfaceId& parent_id, const SurfaceId& child_id);
SurfaceReference(const SurfaceReference& other);
~SurfaceReference();
const SurfaceId& parent_id() const { return parent_id_; }
const SurfaceId& child_id() const { return child_id_; }
size_t hash() const {
return base::HashInts(static_cast<uint64_t>(parent_id_.hash()),
static_cast<uint64_t>(child_id_.hash()));
}
friend std::strong_ordering operator<=>(const SurfaceReference&,
const SurfaceReference&) = default;
std::string ToString() const;
private:
SurfaceId parent_id_;
SurfaceId child_id_;
};
struct SurfaceReferenceHash {
size_t operator()(const SurfaceReference& ref) const { return ref.hash(); }
};
VIZ_SERVICE_EXPORT std::ostream& operator<<(
std::ostream& out,
const SurfaceReference& surface_reference);
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_SURFACES_SURFACE_REFERENCE_H_
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