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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/surfaces/local_surface_id.h"
#include <limits>
#include "base/hash/hash.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "base/tracing/protos/chrome_track_event.pbzero.h"
#include "third_party/perfetto/include/perfetto/tracing/traced_proto.h"
namespace viz {
size_t LocalSurfaceId::hash() const {
DCHECK(is_valid()) << ToString();
return base::HashInts(
static_cast<uint64_t>(
base::HashInts(parent_sequence_number_, child_sequence_number_)),
static_cast<uint64_t>(base::UnguessableTokenHash()(embed_token_)));
}
size_t LocalSurfaceId::persistent_hash() const {
DCHECK(is_valid()) << ToString();
return base::PersistentHash(
base::StringPrintf("%s, %u, %u", embed_token_.ToString().c_str(),
parent_sequence_number_, child_sequence_number_));
}
std::string LocalSurfaceId::ToString() const {
std::string embed_token = VLOG_IS_ON(1)
? embed_token_.ToString()
: embed_token_.ToString().substr(0, 4) + "...";
return base::StringPrintf("LocalSurfaceId(%u, %u, %s)",
parent_sequence_number_, child_sequence_number_,
embed_token.c_str());
}
std::ostream& operator<<(std::ostream& out,
const LocalSurfaceId& local_surface_id) {
return out << local_surface_id.ToString();
}
bool LocalSurfaceId::IsNewerThan(const LocalSurfaceId& other) const {
// Sequence numbers can wrap around so look at their difference instead of
// their absolute values.
return embed_token_ == other.embed_token_ &&
(child_sequence_number_ - other.child_sequence_number_ < (1u << 31)) &&
(parent_sequence_number_ - other.parent_sequence_number_ <
(1u << 31)) &&
(child_sequence_number_ != other.child_sequence_number_ ||
parent_sequence_number_ != other.parent_sequence_number_);
}
bool LocalSurfaceId::IsNewerThanOrEmbeddingChanged(
const LocalSurfaceId& other) const {
return IsNewerThan(other) || embed_token_ != other.embed_token_;
}
bool LocalSurfaceId::IsSameOrNewerThan(const LocalSurfaceId& other) const {
return IsNewerThan(other) || *this == other;
}
LocalSurfaceId LocalSurfaceId::ToSmallestId() const {
return LocalSurfaceId(1, 1, embed_token_);
}
void LocalSurfaceId::WriteIntoTrace(
perfetto::TracedProto<TraceProto> proto) const {
proto->set_parent_sequence_number(parent_sequence_number_);
proto->set_child_sequence_number(child_sequence_number_);
perfetto::protos::pbzero::ChromeUnguessableToken& unguessable_token =
*(proto->set_unguessable_token());
unguessable_token.set_low_token(embed_token_.GetLowForSerialization());
unguessable_token.set_high_token(embed_token_.GetHighForSerialization());
}
} // namespace viz
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