diff options
Diffstat (limited to 'src/widgets/kernel/qwidgetbackingstore.cpp')
| -rw-r--r-- | src/widgets/kernel/qwidgetbackingstore.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp index 6f635611f0..bb4518ec5e 100644 --- a/src/widgets/kernel/qwidgetbackingstore.cpp +++ b/src/widgets/kernel/qwidgetbackingstore.cpp @@ -113,7 +113,12 @@ void QWidgetBackingStore::qt_flush(QWidget *widget, const QRegion ®ion, QBack #ifndef QT_NO_OPENGL if (widgetTextures) { widget->window()->d_func()->sendComposeStatus(widget->window(), false); - backingStore->handle()->composeAndFlush(widget->windowHandle(), region, offset, widgetTextures, tlw->d_func()->shareContext()); + // A window may have alpha even when the app did not request + // WA_TranslucentBackground. Therefore the compositor needs to know whether the app intends + // to rely on translucency, in order to decide if it should clear to transparent or opaque. + const bool translucentBackground = widget->testAttribute(Qt::WA_TranslucentBackground); + backingStore->handle()->composeAndFlush(widget->windowHandle(), region, offset, widgetTextures, + widget->d_func()->shareContext(), translucentBackground); widget->window()->d_func()->sendComposeStatus(widget->window(), true); } else #endif |