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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/frame_token_message_queue.h"
#include "base/functional/bind.h"
namespace content {
FrameTokenMessageQueue::FrameTokenMessageQueue() = default;
FrameTokenMessageQueue::~FrameTokenMessageQueue() = default;
void FrameTokenMessageQueue::Init(Client* client) {
client_ = client;
}
void FrameTokenMessageQueue::DidProcessFrame(uint32_t frame_token,
base::TimeTicks activation_time) {
// The queue will be cleared if the Renderer has been Reset. Do not enforce
// token order, as ACKs for old frames may still be in flight from Viz.
if (callback_map_.empty()) {
last_received_frame_token_ = frame_token;
last_received_activation_time_ = activation_time;
return;
}
// Frame tokens always increase. However when a Reset occurs old tokens can
// arrive. Do not enforce token order if we are seeing the ACK for the
// previous frame.
// TODO(jonross): we should consider updating LocalSurfaceId to also track
// frame_token. So that we could properly differentiate between origins of
// frame. As we cannot enforce ordering between Reset Renderers.
if ((frame_token <= last_received_frame_token_) &&
!(last_received_frame_token_reset_ &&
last_received_frame_token_reset_ != frame_token)) {
client_->OnInvalidFrameToken(frame_token);
return;
}
last_received_frame_token_ = frame_token;
last_received_activation_time_ = activation_time;
// Gets the first callback associated with a token after |frame_token| or
// callback_map_.end().
auto upper_bound = callback_map_.upper_bound(frame_token);
// std::multimap already sorts on keys, so this will process all enqueued
// messages up to the current frame token.
for (auto it = callback_map_.begin(); it != upper_bound; ++it)
std::move(it->second).Run(activation_time);
// Clear all callbacks up to the current frame token.
callback_map_.erase(callback_map_.begin(), upper_bound);
}
void FrameTokenMessageQueue::EnqueueOrRunFrameTokenCallback(
uint32_t frame_token,
base::OnceCallback<void(base::TimeTicks)> callback) {
if (frame_token <= last_received_frame_token_) {
std::move(callback).Run(last_received_activation_time_);
return;
}
callback_map_.insert(std::make_pair(frame_token, std::move(callback)));
}
void FrameTokenMessageQueue::Reset() {
last_received_frame_token_reset_ = last_received_frame_token_;
last_received_frame_token_ = 0;
callback_map_.clear();
}
} // namespace content
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