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[idd] debounce resolution changes

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This commit is contained in:
Geoffrey McRae
2026-07-16 19:32:12 +10:00
parent 1ce446f97a
commit 5e6d88f382
2 changed files with 72 additions and 2 deletions
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64
idd/LGIdd/CIndirectDeviceContext.cpp
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@@ -574,9 +574,61 @@ void CIndirectDeviceContext::SetResolution(int width, int height)
mode.refresh = g_settings.GetDefaultRefresh();
mode.preferred = true;
// A window resize streams many WINDOWSIZE requests in quick succession.
// Record the latest request and (re)start a timer; the actual mode change and
// replug only happen once the requested resolution has settled (i.e. no new
// request has arrived) for m_resChangeDelayMs. Each new request restarts the
// countdown, coalescing a burst of resizes into a single replug.
AcquireSRWLockExclusive(&m_stateLock);
m_setMode = mode;
m_doSetMode = true;
m_pendingMode = mode;
m_resChangePending = true;
ReleaseSRWLockExclusive(&m_stateLock);
// Create the debounce timer once; WdfTimerStart on an already-queued
// non-periodic timer simply updates its due time, giving us the restart.
if (!m_resChangeTimer)
{
WDF_TIMER_CONFIG config;
WDF_TIMER_CONFIG_INIT(&config,
[](WDFTIMER timer) -> void
{
WDFOBJECT parent = WdfTimerGetParentObject(timer);
auto wrapper = WdfObjectGet_CIndirectDeviceContextWrapper(parent);
wrapper->context->ApplyResolution();
});
config.AutomaticSerialization = FALSE;
WDF_OBJECT_ATTRIBUTES attribs;
WDF_OBJECT_ATTRIBUTES_INIT(&attribs);
attribs.ParentObject = m_wdfDevice;
attribs.ExecutionLevel = WdfExecutionLevelDispatch;
NTSTATUS status = WdfTimerCreate(&config, &attribs, &m_resChangeTimer);
if (!NT_SUCCESS(status))
{
DEBUG_ERROR_HR(status, "Resolution change timer creation failed");
m_resChangeTimer = nullptr;
// Fall back to applying immediately so a resize is not lost.
ApplyResolution();
return;
}
}
WdfTimerStart(m_resChangeTimer, WDF_REL_TIMEOUT_IN_MS(m_resChangeDelayMs));
}
void CIndirectDeviceContext::ApplyResolution()
{
AcquireSRWLockExclusive(&m_stateLock);
if (!m_resChangePending)
{
ReleaseSRWLockExclusive(&m_stateLock);
return;
}
CSettings::DisplayMode mode = m_pendingMode;
m_resChangePending = false;
m_setMode = mode;
m_doSetMode = true;
ReleaseSRWLockExclusive(&m_stateLock);
g_settings.SetExtraMode(mode);
@@ -779,6 +831,14 @@ void CIndirectDeviceContext::DeInitLGMP()
m_initTimer = nullptr;
}
// The resolution debounce timer callback dereferences this context too; stop
// and drain it before tearing anything down.
if (m_resChangeTimer)
{
WdfTimerStop(m_resChangeTimer, TRUE);
m_resChangeTimer = nullptr;
}
if (m_lgmp == nullptr)
return;