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// Copyright 2017 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.
#ifndef CC_SURFACES_LOCAL_SURFACE_ID_H_
#define CC_SURFACES_LOCAL_SURFACE_ID_H_
#include <inttypes.h>
#include <iosfwd>
#include <string>
#include <tuple>
#include "base/hash.h"
#include "base/unguessable_token.h"
#include "mojo/public/cpp/bindings/struct_traits.h"
namespace cc {
namespace mojom {
class LocalSurfaceIdDataView;
}
class LocalSurfaceId {
public:
constexpr LocalSurfaceId() : local_id_(0) {}
constexpr LocalSurfaceId(const LocalSurfaceId& other)
: local_id_(other.local_id_), nonce_(other.nonce_) {}
constexpr LocalSurfaceId(uint32_t local_id,
const base::UnguessableToken& nonce)
: local_id_(local_id), nonce_(nonce) {}
constexpr bool is_valid() const {
return local_id_ != 0 && !nonce_.is_empty();
}
constexpr uint32_t local_id() const { return local_id_; }
constexpr const base::UnguessableToken& nonce() const { return nonce_; }
bool operator==(const LocalSurfaceId& other) const {
return local_id_ == other.local_id_ && nonce_ == other.nonce_;
}
bool operator!=(const LocalSurfaceId& other) const {
return !(*this == other);
}
bool operator<(const LocalSurfaceId& other) const {
return std::tie(local_id_, nonce_) <
std::tie(other.local_id_, other.nonce_);
}
size_t hash() const {
DCHECK(is_valid()) << ToString();
return base::HashInts(
local_id_, static_cast<uint64_t>(base::UnguessableTokenHash()(nonce_)));
}
std::string ToString() const;
private:
friend struct mojo::StructTraits<mojom::LocalSurfaceIdDataView,
LocalSurfaceId>;
uint32_t local_id_;
base::UnguessableToken nonce_;
};
std::ostream& operator<<(std::ostream& out,
const LocalSurfaceId& local_surface_id);
struct LocalSurfaceIdHash {
size_t operator()(const LocalSurfaceId& key) const { return key.hash(); }
};
} // namespace cc
#endif // CC_SURFACES_LOCAL_SURFACE_ID_H_