diff options
Diffstat (limited to 'src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp')
-rw-r--r-- | src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp index 8851ea59e5..bbc156fc53 100644 --- a/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp +++ b/src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp @@ -62,8 +62,10 @@ QXcbNativeBackingStore::QXcbNativeBackingStore(QWindow *window) : QPlatformBackingStore(window) , m_translucentBackground(false) { - if (QXcbWindow *w = static_cast<QXcbWindow *>(window->handle())) - m_translucentBackground = w->connection()->hasXRender() && QImage::toPixelFormat(w->imageFormat()).alphaSize() > 0; + if (QXcbWindow *w = static_cast<QXcbWindow *>(window->handle())) { + m_translucentBackground = w->connection()->hasXRender() && + QImage::toPixelFormat(w->imageFormat()).alphaUsage() == QPixelFormat::UsesAlpha; + } } QXcbNativeBackingStore::~QXcbNativeBackingStore() @@ -190,6 +192,10 @@ bool QXcbNativeBackingStore::scroll(const QRegion &area, int dx, int dy) void QXcbNativeBackingStore::beginPaint(const QRegion ®ion) { + QX11PlatformPixmap *x11pm = qt_x11Pixmap(m_pixmap); + if (x11pm) + x11pm->setIsBackingStore(true); + #if QT_CONFIG(xrender) if (m_translucentBackground) { const QVector<XRectangle> xrects = qt_region_to_xrectangles(region); |