Index: content/browser/compositor/gpu_vsync_begin_frame_source.cc |
diff --git a/content/browser/compositor/gpu_vsync_begin_frame_source.cc b/content/browser/compositor/gpu_vsync_begin_frame_source.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..f9414105a00a395fe48c3f911079387105fe2099 |
--- /dev/null |
+++ b/content/browser/compositor/gpu_vsync_begin_frame_source.cc |
@@ -0,0 +1,44 @@ |
+// 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 |