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Windows: Ensure DPI awareness is set only once.

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Fix warning:

QWARN  : tst_QGuiApplication::execAfterExit() SetProcessDpiAwareness failed: "COM error 0xffffffff80070005  (Unknown error 0x0ffffffff80070005)"

occurring when instantiating QGuiApplication repeatedly in tests.

Task-number: QTBUG-38993
Change-Id: Id6c8e915b25011bb60c2f8b1d0e4a794cd345647
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
This commit is contained in:
Friedemann Kleint 2014-08-04 12:24:01 +02:00
parent 501fe9f939
commit f6ee80912f
1 changed files with 5 additions and 1 deletions
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4
src/plugins/platforms/windows/qwindowsintegration.cpp
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@ -217,6 +217,7 @@ QWindowsIntegrationPrivate::QWindowsIntegrationPrivate(const QStringList &paramL
: m_options(0)
, m_fontDatabase(0)
{
static bool dpiAwarenessSet = false;
int tabletAbsoluteRange = -1;
// Default to per-monitor awareness to avoid being scaled when monitors with different DPI
// are connected to Windows 8.1
@ -224,7 +225,10 @@ QWindowsIntegrationPrivate::QWindowsIntegrationPrivate(const QStringList &paramL
m_options = parseOptions(paramList, &tabletAbsoluteRange, &dpiAwareness);
if (tabletAbsoluteRange >= 0)
m_context.setTabletAbsoluteRange(tabletAbsoluteRange);
if (!dpiAwarenessSet) { // Set only once in case of repeated instantiations of QGuiApplication.
m_context.setProcessDpiAwareness(dpiAwareness);
dpiAwarenessSet = true;
}
}
QWindowsIntegrationPrivate::~QWindowsIntegrationPrivate()