diff options
Diffstat (limited to 'src/plugins/platforms/xcb/qxcbbackingstore.cpp')
| -rw-r--r-- | src/plugins/platforms/xcb/qxcbbackingstore.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/plugins/platforms/xcb/qxcbbackingstore.cpp b/src/plugins/platforms/xcb/qxcbbackingstore.cpp index 212fc722c0..e3686ec010 100644 --- a/src/plugins/platforms/xcb/qxcbbackingstore.cpp +++ b/src/plugins/platforms/xcb/qxcbbackingstore.cpp @@ -73,6 +73,8 @@ public: QSize size() const { return m_qimage.size(); } + bool hasAlpha() const { return m_hasAlpha; } + void put(xcb_window_t window, const QPoint &dst, const QRect &source); void preparePaint(const QRegion ®ion); @@ -90,6 +92,8 @@ private: xcb_window_t m_gc_window; QRegion m_dirty; + + bool m_hasAlpha; }; class QXcbShmGraphicsBuffer : public QPlatformGraphicsBuffer @@ -179,7 +183,8 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QI qWarning() << "QXcbBackingStore: Error while marking the shared memory segment to be destroyed"; } - if (QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::IgnoresAlpha) + m_hasAlpha = QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha; + if (!m_hasAlpha) format = qt_alphaVersionForPainting(format); m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, format); @@ -330,7 +335,7 @@ void QXcbBackingStore::beginPaint(const QRegion ®ion) m_paintRegion = region; m_image->preparePaint(m_paintRegion); - if (m_image->image()->hasAlphaChannel()) { + if (m_image->hasAlpha()) { QPainter p(paintDevice()); p.setCompositionMode(QPainter::CompositionMode_Source); const QVector<QRect> rects = m_paintRegion.rects(); |