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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gl/vsync_provider_win_dcomp.h"
#include "base/trace_event/typed_macros.h"
namespace gl {
VSyncProviderWinDComp::VSyncProviderWinDComp() = default;
VSyncProviderWinDComp::~VSyncProviderWinDComp() = default;
void VSyncProviderWinDComp::GetVSyncParameters(UpdateVSyncCallback callback) {
base::TimeTicks timebase;
base::TimeDelta interval;
if (GetVSyncParametersIfAvailable(&timebase, &interval)) {
std::move(callback).Run(timebase, interval);
}
}
// Use the compositor clock to determine vsync interval (as opposed
// to algining with primary monitor) to more optimally align vsync
// interval to video FPS in multi-display mixed refresh rate or VRR configs.
bool VSyncProviderWinDComp::GetVSyncParametersIfAvailable(
base::TimeTicks* out_timebase,
base::TimeDelta* out_interval) {
TRACE_EVENT0("gpu", "VSyncProviderWinDComp::GetVSyncParametersIfAvailable");
HRESULT hr = S_OK;
COMPOSITION_FRAME_ID frame_id;
hr = gl::DCompositionGetFrameId(COMPOSITION_FRAME_ID_COMPLETED, &frame_id);
CHECK_EQ(S_OK, hr);
// DCompositionGetStatistics may fail in situations such as switching
// to a remote session. Cache the previous frame stats in case of failure.
COMPOSITION_FRAME_STATS stats;
hr = gl::DCompositionGetStatistics(frame_id, &stats, 0, nullptr, nullptr);
if (FAILED(hr)) {
DLOG(ERROR) << "DCompositionGetStatistics failed: "
<< logging::SystemErrorCodeToString(hr);
if (prev_frame_stats_.has_value()) {
stats = prev_frame_stats_.value();
*out_interval = base::TimeDelta::FromQPCValue(stats.framePeriod);
*out_timebase =
base::TimeTicks::Now().SnappedToNextTick(
base::TimeTicks::FromQPCValue(stats.startTime), *out_interval) -
*out_interval;
return true;
}
return false;
}
prev_frame_stats_ = stats;
*out_timebase = base::TimeTicks::FromQPCValue(stats.startTime);
*out_interval = base::TimeDelta::FromQPCValue(stats.framePeriod);
return true;
}
bool VSyncProviderWinDComp::SupportGetVSyncParametersIfAvailable() const {
return true;
}
bool VSyncProviderWinDComp::IsHWClock() const {
return true;
}
} // namespace gl
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