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// Copyright 2015 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.
#include "content/browser/renderer_host/begin_frame_observer_proxy.h"
namespace content {
BeginFrameObserverProxy::BeginFrameObserverProxy(
BeginFrameObserverProxyClient* client)
: needs_begin_frames_(false),
client_(client),
compositor_(nullptr) {
}
BeginFrameObserverProxy::~BeginFrameObserverProxy() {
DCHECK(!compositor_);
}
void BeginFrameObserverProxy::SetNeedsBeginFrames(bool needs_begin_frames) {
if (needs_begin_frames_ == needs_begin_frames)
return;
needs_begin_frames_ = needs_begin_frames;
// In some cases, BeginFrame message is requested before |client_|'s window is
// added in the root window hierarchy.
if (!compositor_)
return;
if (needs_begin_frames)
StartObservingBeginFrames();
else
StopObservingBeginFrames();
}
void BeginFrameObserverProxy::SetCompositor(ui::Compositor* compositor) {
DCHECK(!compositor_);
DCHECK(compositor);
compositor_ = compositor;
compositor_->AddObserver(this);
if (needs_begin_frames_)
StartObservingBeginFrames();
}
void BeginFrameObserverProxy::ResetCompositor() {
if (!compositor_)
return;
compositor_->RemoveObserver(this);
if (needs_begin_frames_)
StopObservingBeginFrames();
compositor_ = nullptr;
}
void BeginFrameObserverProxy::OnSendBeginFrame(const cc::BeginFrameArgs& args) {
if (last_sent_begin_frame_args_.frame_time != args.frame_time)
client_->SendBeginFrame(args);
last_sent_begin_frame_args_ = args;
}
void BeginFrameObserverProxy::OnCompositingShuttingDown(
ui::Compositor* compositor) {
ResetCompositor();
}
void BeginFrameObserverProxy::StartObservingBeginFrames() {
DCHECK(compositor_);
compositor_->AddBeginFrameObserver(this);
}
void BeginFrameObserverProxy::StopObservingBeginFrames() {
DCHECK(compositor_);
compositor_->RemoveBeginFrameObserver(this);
}
} // namespace content
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