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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 "components/viz/service/frame_sinks/external_begin_frame_source_mojo.h"
#include <utility>
#include "components/viz/service/frame_sinks/frame_sink_manager_impl.h"
namespace viz {
ExternalBeginFrameSourceMojo::ExternalBeginFrameSourceMojo(
FrameSinkManagerImpl* frame_sink_manager,
mojo::PendingAssociatedReceiver<mojom::ExternalBeginFrameController>
controller_receiver,
mojo::PendingAssociatedRemote<mojom::ExternalBeginFrameControllerClient>
controller_client_remote,
uint32_t restart_id)
: ExternalBeginFrameSource(this, restart_id),
frame_sink_manager_(frame_sink_manager),
receiver_(this, std::move(controller_receiver)),
remote_client_(std::move(controller_client_remote)) {
frame_sink_manager_->AddObserver(this);
}
ExternalBeginFrameSourceMojo::~ExternalBeginFrameSourceMojo() {
frame_sink_manager_->RemoveObserver(this);
DCHECK(!display_);
}
void ExternalBeginFrameSourceMojo::IssueExternalBeginFrame(
const BeginFrameArgs& args,
bool force,
base::OnceCallback<void(const BeginFrameAck&)> callback) {
DCHECK(!pending_frame_callback_) << "Got overlapping IssueExternalBeginFrame";
DCHECK(pending_frame_sinks_.empty());
original_source_id_ = args.frame_id.source_id;
OnBeginFrame(args);
pending_frame_callback_ = std::move(callback);
// When not forcing a frame, wait for it to occur when sinks needs a frame.
if (!force)
return;
// Ensure that Display will receive the BeginFrame (as a missed one), even
// if it doesn't currently need it. This way, we ensure that
// OnDisplayDidFinishFrame will be called for this BeginFrame.
DCHECK(display_);
display_->SetNeedsOneBeginFrame();
MaybeProduceFrameCallback();
}
void ExternalBeginFrameSourceMojo::OnDestroyedCompositorFrameSink(
const FrameSinkId& sink_id) {
pending_frame_sinks_.erase(sink_id);
MaybeProduceFrameCallback();
}
void ExternalBeginFrameSourceMojo::OnFrameSinkDidBeginFrame(
const FrameSinkId& sink_id,
const BeginFrameArgs& args) {
if (args.frame_id.source_id != original_source_id_)
return;
pending_frame_sinks_.insert(sink_id);
}
void ExternalBeginFrameSourceMojo::OnFrameSinkDidFinishFrame(
const FrameSinkId& sink_id,
const BeginFrameArgs& args) {
if (args.frame_id.source_id != original_source_id_)
return;
pending_frame_sinks_.erase(sink_id);
MaybeProduceFrameCallback();
}
void ExternalBeginFrameSourceMojo::MaybeProduceFrameCallback() {
if (!pending_frame_sinks_.empty())
return;
if (!pending_frame_callback_)
return;
if (pending_ack_) {
DispatchFrameCallback(*pending_ack_);
pending_ack_.reset();
return;
}
// If there aren't pending surfaces and the root frame is not missing,
// the display scheduler is likely to produce proper frame, so let it do
// its work. Otherwise, fire the pending frame callback early.
if (!display_->IsRootFrameMissing() &&
!display_->HasPendingSurfaces(last_begin_frame_args_)) {
return;
}
// All frame sinks are done with frame, yet the root frame is still missing,
// the display won't draw, so resolve callback now.
BeginFrameAck nak(last_begin_frame_args_.frame_id.source_id,
last_begin_frame_args_.frame_id.sequence_number,
/*has_damage=*/false);
DispatchFrameCallback(nak);
}
void ExternalBeginFrameSourceMojo::DispatchFrameCallback(
const BeginFrameAck& ack) {
// If there are pending copy output requests that have not been fulfilled,
// cancel them, as they won't be served till the next frame. This prevents
// the client for waiting for them indefinitely.
frame_sink_manager_->DiscardPendingCopyOfOutputRequests(this);
// Prevent missing begin frames from being sent to sinks that came late,
// as this may result in two overlapping frames being sent, which is not
// supported with full pipeline mode.
last_begin_frame_args_ = BeginFrameArgs();
std::move(pending_frame_callback_).Run(ack);
}
void ExternalBeginFrameSourceMojo::OnDisplayDidFinishFrame(
const BeginFrameAck& ack) {
if (!pending_frame_callback_)
return;
if (!pending_frame_sinks_.empty()) {
DCHECK(!pending_ack_);
pending_ack_ = ack;
return;
}
DispatchFrameCallback(ack);
}
void ExternalBeginFrameSourceMojo::OnDisplayDestroyed() {
// As part of destruction, we are automatically removed as a display
// observer. No need to call RemoveObserver.
display_ = nullptr;
}
void ExternalBeginFrameSourceMojo::SetDisplay(Display* display) {
if (display_)
display_->RemoveObserver(this);
display_ = display;
if (display_)
display_->AddObserver(this);
}
void ExternalBeginFrameSourceMojo::OnNeedsBeginFrames(bool needs_begin_frames) {
if (remote_client_) {
remote_client_->SetNeedsBeginFrame(needs_begin_frames);
}
}
void ExternalBeginFrameSourceMojo::SetPreferredInterval(
base::TimeDelta interval) {
if (remote_client_) {
remote_client_->SetPreferredInterval(interval);
}
}
} // namespace viz
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