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// Copyright 2014 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_SURFACES_SURFACE_ID_H_
#define COMPONENTS_VIZ_COMMON_SURFACES_SURFACE_ID_H_
#include <stdint.h>
#include <compare>
#include <iosfwd>
#include <string>
#include <string_view>
#include "base/hash/hash.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "components/viz/common/surfaces/local_surface_id.h"
#include "components/viz/common/viz_common_export.h"
#include "mojo/public/cpp/bindings/struct_traits.h"
namespace viz {
namespace mojom {
class SurfaceIdDataView;
}
class VIZ_COMMON_EXPORT SurfaceId {
public:
constexpr SurfaceId() = default;
constexpr SurfaceId(const SurfaceId& other) = default;
constexpr SurfaceId& operator=(const SurfaceId& other) = default;
// A SurfaceId consists of two components: FrameSinkId and LocalSurfaceId.
// A |frame_sink_id| consists of two components; one is allocated by the
// display compositor service and one is allocated by the client. The
// |frame_sink_id| uniquely identifies a FrameSink (and frame source).
// A |local_surface_id| is a sequentially allocated ID generated by the frame
// source that uniquely identifies a sequential set of frames of the same size
// and device scale factor.
constexpr SurfaceId(const FrameSinkId& frame_sink_id,
const LocalSurfaceId& local_surface_id)
: frame_sink_id_(frame_sink_id), local_surface_id_(local_surface_id) {}
static constexpr SurfaceId MaxSequenceId(const FrameSinkId& frame_sink_id) {
return SurfaceId(frame_sink_id, LocalSurfaceId::MaxSequenceId());
}
bool is_valid() const {
return frame_sink_id_.is_valid() && local_surface_id_.is_valid();
}
size_t hash() const {
return base::HashInts(static_cast<uint64_t>(frame_sink_id_.hash()),
static_cast<uint64_t>(local_surface_id_.hash()));
}
const FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
const LocalSurfaceId& local_surface_id() const { return local_surface_id_; }
std::string ToString() const;
std::string ToString(std::string_view frame_sink_debug_label) const;
// Returns whether this SurfaceId was generated after |other|.
bool IsNewerThan(const SurfaceId& other) const;
// Returns whether this SurfaceId is the same as or was generated after
// |other|.
bool IsSameOrNewerThan(const SurfaceId& other) const;
// Returns the smallest valid SurfaceId with the same FrameSinkId and embed
// token as this SurfaceId.
SurfaceId ToSmallestId() const;
// Returns whether this SurfaceId has the same embed token as |other|.
bool HasSameEmbedTokenAs(const SurfaceId& other) const;
friend std::strong_ordering operator<=>(const SurfaceId&,
const SurfaceId&) = default;
private:
friend struct mojo::StructTraits<mojom::SurfaceIdDataView, SurfaceId>;
FrameSinkId frame_sink_id_;
LocalSurfaceId local_surface_id_;
};
VIZ_COMMON_EXPORT std::ostream& operator<<(std::ostream& out,
const SurfaceId& surface_id);
struct SurfaceIdHash {
size_t operator()(const SurfaceId& key) const { return key.hash(); }
};
} // namespace viz
#endif // COMPONENTS_VIZ_COMMON_SURFACES_SURFACE_ID_H_
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