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Windows: Add a workaround for render-to-texture widgets for translucent windows

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Do not attempt to switch from translucent GL windows (emulated by DWM blur
behind) to translucent raster windows (using layered windows) as
this produces warnings from UpdateLayeredWindowIndirect() failing.

Task-number: QTBUG-54734
Change-Id: Ie05126c5cb091a00f17b88a74b287c90aa2dfebd
Reviewed-by: Joni Poikelin <joni.poikelin@qt.io>
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Friedemann Kleint 2016-07-14 16:19:42 +02:00
parent 34de4f6a15
commit 89765ced6e
1 changed files with 3 additions and 1 deletions
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4
src/widgets/kernel/qwidgetbackingstore.cpp
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@ -1018,9 +1018,11 @@ static QPlatformTextureList *widgetTexturesFor(QWidget *tlw, QWidget *widget)
// The Windows compositor handles fullscreen OpenGL window specially. Besides
// having trouble with popups, it also has issues with flip-flopping between
// OpenGL-based and normal flushing. Therefore, stick with GL for fullscreen
// windows. (QTBUG-53515)
// windows (QTBUG-53515). Similary, translucent windows should not switch to
// layered native windows (QTBUG-54734).
#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT) && !defined(Q_OS_WINCE)
|| tlw->windowState().testFlag(Qt::WindowFullScreen)
|| tlw->testAttribute(Qt::WA_TranslucentBackground)
#endif
)
{