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The DWM workaround is not needed when DWM composition is disabled 

Signed-off-by: Yuhang Zhao <2546789017@qq.com>
This commit is contained in:
Yuhang Zhao 2022-01-03 11:03:24 +08:00
parent 9904a5077a
commit c3c5ef0d5d
1 changed files with 58 additions and 56 deletions
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114
framelesshelper_win32.cpp
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@ -376,62 +376,64 @@ bool FramelessHelperWin::nativeEventFilter(const QByteArray &eventType, void *me
// is not correct. It confuses QPA's internal logic.
clientRect->bottom += 1;
#endif
// Dirty hack to workaround the DWM flicker.
LARGE_INTEGER freq = {};
if (QueryPerformanceFrequency(&freq) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceFrequency"));
break;
}
TIMECAPS tc = {};
if (timeGetDevCaps(&tc, sizeof(tc)) != MMSYSERR_NOERROR) {
qWarning() << "timeGetDevCaps() failed.";
break;
}
const UINT ms_granularity = tc.wPeriodMin;
if (timeBeginPeriod(ms_granularity) != TIMERR_NOERROR) {
qWarning() << "timeBeginPeriod() failed.";
break;
}
LARGE_INTEGER now0 = {};
if (QueryPerformanceCounter(&now0) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
break;
}
// ask DWM where the vertical blank falls
DWM_TIMING_INFO dti;
SecureZeroMemory(&dti, sizeof(dti));
dti.cbSize = sizeof(dti);
const HRESULT hr = DwmGetCompositionTimingInfo(nullptr, &dti);
if (FAILED(hr)) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("DwmGetCompositionTimingInfo"));
break;
}
LARGE_INTEGER now1 = {};
if (QueryPerformanceCounter(&now1) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
break;
}
// - DWM told us about SOME vertical blank
// - past or future, possibly many frames away
// - convert that into the NEXT vertical blank
const LONGLONG period = dti.qpcRefreshPeriod;
const LONGLONG dt = dti.qpcVBlank - now1.QuadPart;
LONGLONG w = 0, m = 0;
if (dt >= 0) {
w = dt / period;
} else {
// reach back to previous period
// - so m represents consistent position within phase
w = -1 + dt / period;
}
m = dt - (period * w);
Q_ASSERT(m >= 0);
Q_ASSERT(m < period);
const qreal m_ms = 1000.0 * static_cast<qreal>(m) / static_cast<qreal>(freq.QuadPart);
Sleep(static_cast<DWORD>(qRound(m_ms)));
if (timeEndPeriod(ms_granularity) != TIMERR_NOERROR) {
qWarning() << "timeEndPeriod() failed.";
break;
if (Utilities::isDwmCompositionAvailable()) {
// Dirty hack to workaround the resize flicker caused by DWM.
LARGE_INTEGER freq = {};
if (QueryPerformanceFrequency(&freq) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceFrequency"));
break;
}
TIMECAPS tc = {};
if (timeGetDevCaps(&tc, sizeof(tc)) != MMSYSERR_NOERROR) {
qWarning() << "timeGetDevCaps() failed.";
break;
}
const UINT ms_granularity = tc.wPeriodMin;
if (timeBeginPeriod(ms_granularity) != TIMERR_NOERROR) {
qWarning() << "timeBeginPeriod() failed.";
break;
}
LARGE_INTEGER now0 = {};
if (QueryPerformanceCounter(&now0) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
break;
}
// ask DWM where the vertical blank falls
DWM_TIMING_INFO dti;
SecureZeroMemory(&dti, sizeof(dti));
dti.cbSize = sizeof(dti);
const HRESULT hr = DwmGetCompositionTimingInfo(nullptr, &dti);
if (FAILED(hr)) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("DwmGetCompositionTimingInfo"));
break;
}
LARGE_INTEGER now1 = {};
if (QueryPerformanceCounter(&now1) == FALSE) {
qWarning() << Utilities::getSystemErrorMessage(QStringLiteral("QueryPerformanceCounter"));
break;
}
// - DWM told us about SOME vertical blank
// - past or future, possibly many frames away
// - convert that into the NEXT vertical blank
const LONGLONG period = dti.qpcRefreshPeriod;
const LONGLONG dt = dti.qpcVBlank - now1.QuadPart;
LONGLONG w = 0, m = 0;
if (dt >= 0) {
w = dt / period;
} else {
// reach back to previous period
// - so m represents consistent position within phase
w = -1 + dt / period;
}
m = dt - (period * w);
Q_ASSERT(m >= 0);
Q_ASSERT(m < period);
const qreal m_ms = 1000.0 * static_cast<qreal>(m) / static_cast<qreal>(freq.QuadPart);
Sleep(static_cast<DWORD>(qRound(m_ms)));
if (timeEndPeriod(ms_granularity) != TIMERR_NOERROR) {
qWarning() << "timeEndPeriod() failed.";
break;
}
}
// We cannot return WVR_REDRAW otherwise Windows exhibits bugs where
// client pixels and child windows are mispositioned by the width/height