diff options
| author | Andy Shaw <andy.shaw@qt.io> | 2018-10-02 15:05:32 +0200 |
|---|---|---|
| committer | Andy Shaw <andy.shaw@qt.io> | 2018-10-12 07:26:55 +0000 |
| commit | dc5f9d0c3101f95185d3c562d001e0af18f46a0b (patch) | |
| tree | eeeeab171cb4e744083ceac1b8960792cf22bb8c | |
| parent | 091a386eaf91ad8932332a8aefc2df793de59f6c (diff) | |
Only use a translucent background if there is support for alpha
Change-Id: Ia8d9e543fac4b6e790fa38cf04c5a782d72d72df
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
Reviewed-by: Gatis Paeglis <gatis.paeglis@qt.io>
| -rw-r--r-- | src/plugins/platforms/xcb/nativepainting/qbackingstore_x11.cpp | 6 |
1 files changed, 4 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..ed482e5dae 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() |