| // Copyright 2016 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/compositor/gpu_vsync_begin_frame_source.h" |
| |
| namespace content { |
| |
| GpuVSyncBeginFrameSource::GpuVSyncBeginFrameSource( |
| GpuVSyncControl* vsync_control) |
| : cc::ExternalBeginFrameSource(this), |
| vsync_control_(vsync_control), |
| needs_begin_frames_(false), |
| next_sequence_number_(cc::BeginFrameArgs::kStartingFrameNumber) { |
| DCHECK(vsync_control); |
| } |
| |
| GpuVSyncBeginFrameSource::~GpuVSyncBeginFrameSource() = default; |
| |
| void GpuVSyncBeginFrameSource::OnVSync(base::TimeTicks timestamp, |
| base::TimeDelta interval) { |
| if (!needs_begin_frames_) |
| return; |
| |
| base::TimeTicks now = base::TimeTicks::Now(); |
| base::TimeTicks deadline = now.SnappedToNextTick(timestamp, interval); |
| |
| TRACE_EVENT1("cc", "GpuVSyncBeginFrameSource::OnVSync", "latency", |
| (now - timestamp).ToInternalValue()); |
| |
| next_sequence_number_++; |
| OnBeginFrame(cc::BeginFrameArgs::Create( |
| BEGINFRAME_FROM_HERE, source_id(), next_sequence_number_, timestamp, |
| deadline, interval, cc::BeginFrameArgs::NORMAL)); |
| } |
| |
| void GpuVSyncBeginFrameSource::OnNeedsBeginFrames(bool needs_begin_frames) { |
| needs_begin_frames_ = needs_begin_frames; |
| vsync_control_->SetNeedsVSync(needs_begin_frames); |
| } |
| |
| void GpuVSyncBeginFrameSource::OnDidFinishFrame(const cc::BeginFrameAck& ack) {} |
| |
| } // namespace content |