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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/browser/compositor/gpu_vsync_begin_frame_source.h" |
| 6 |
| 7 namespace content { |
| 8 |
| 9 GpuVSyncBeginFrameSource::GpuVSyncBeginFrameSource( |
| 10 GpuVSyncControl* vsync_control) |
| 11 : cc::ExternalBeginFrameSource(this), |
| 12 vsync_control_(vsync_control), |
| 13 needs_begin_frames_(false), |
| 14 next_sequence_number_(cc::BeginFrameArgs::kStartingFrameNumber) { |
| 15 DCHECK(vsync_control); |
| 16 } |
| 17 |
| 18 GpuVSyncBeginFrameSource::~GpuVSyncBeginFrameSource() = default; |
| 19 |
| 20 void GpuVSyncBeginFrameSource::OnVSync(base::TimeTicks timestamp, |
| 21 base::TimeDelta interval) { |
| 22 if (!needs_begin_frames_) |
| 23 return; |
| 24 |
| 25 base::TimeTicks now = base::TimeTicks::Now(); |
| 26 base::TimeTicks deadline = now.SnappedToNextTick(timestamp, interval); |
| 27 |
| 28 TRACE_EVENT1("cc", "GpuVSyncBeginFrameSource::OnVSync", "latency", |
| 29 (now - timestamp).ToInternalValue()); |
| 30 |
| 31 next_sequence_number_++; |
| 32 OnBeginFrame(cc::BeginFrameArgs::Create( |
| 33 BEGINFRAME_FROM_HERE, source_id(), next_sequence_number_, timestamp, |
| 34 deadline, interval, cc::BeginFrameArgs::NORMAL)); |
| 35 } |
| 36 |
| 37 void GpuVSyncBeginFrameSource::OnNeedsBeginFrames(bool needs_begin_frames) { |
| 38 needs_begin_frames_ = needs_begin_frames; |
| 39 vsync_control_->SetNeedsVSync(needs_begin_frames); |
| 40 } |
| 41 |
| 42 void GpuVSyncBeginFrameSource::OnDidFinishFrame(const cc::BeginFrameAck& ack) {} |
| 43 |
| 44 } // namespace content |
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