From ab3603d2b5ed2cb6bc403643d82e97015449546b Mon Sep 17 00:00:00 2001 From: Laszlo Agocs Date: Thu, 5 Jun 2014 14:20:34 +0200 Subject: Fix alpha in no-opengl configuration on xcb Like the EGL + xcb configuration, the -no-opengl is broken too when it comes to translucent windows: Requesting an alpha channel is futile since the xcb_create_window call always uses the root's depth and visual. This is now corrected by picking a 32-bit visual. This will make translucent windows and drag pixmaps appear correctly again. Task-number: QTBUG-35126 Change-Id: I00e7d6e08b5fcc055ef3ea6d822561740a1f5457 Reviewed-by: Gatis Paeglis --- src/plugins/platforms/xcb/qxcbwindow.cpp | 34 ++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) (limited to 'src/plugins/platforms/xcb/qxcbwindow.cpp') diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp index a46fe437d8..74d8b7c2c8 100644 --- a/src/plugins/platforms/xcb/qxcbwindow.cpp +++ b/src/plugins/platforms/xcb/qxcbwindow.cpp @@ -337,12 +337,38 @@ void QXcbWindow::create() #endif //defined(XCB_USE_GLX) || defined(XCB_USE_EGL) { m_window = xcb_generate_id(xcb_connection()); + m_visualId = m_screen->screen()->root_visual; m_depth = m_screen->screen()->root_depth; + + uint32_t mask = 0; + uint32_t values[3]; + + if (m_format.alphaBufferSize() == 8) { + xcb_depth_iterator_t depthIter = xcb_screen_allowed_depths_iterator(m_screen->screen()); + while (depthIter.rem) { + if (depthIter.data->depth == 32) { + xcb_visualtype_iterator_t visualIter = xcb_depth_visuals_iterator(depthIter.data); + if (visualIter.rem) { + m_visualId = visualIter.data->visual_id; + m_depth = 32; + uint32_t colormap = xcb_generate_id(xcb_connection()); + xcb_create_colormap(xcb_connection(), XCB_COLORMAP_ALLOC_NONE, colormap, + xcb_parent_id, m_visualId); + mask |= XCB_CW_BACK_PIXEL | XCB_CW_BORDER_PIXEL | XCB_CW_COLORMAP; + values[0] = m_screen->screen()->white_pixel; + values[1] = m_screen->screen()->black_pixel; + values[2] = colormap; + break; + } + } + xcb_depth_next(&depthIter); + } + } + m_imageFormat = imageFormatForDepth(m_depth); - m_visualId = m_screen->screen()->root_visual; Q_XCB_CALL(xcb_create_window(xcb_connection(), - XCB_COPY_FROM_PARENT, // depth -- same as root + m_depth, m_window, // window id xcb_parent_id, // parent window id rect.x(), @@ -352,8 +378,8 @@ void QXcbWindow::create() 0, // border width XCB_WINDOW_CLASS_INPUT_OUTPUT, // window class m_visualId, // visual - 0, // value mask - 0)); // value list + mask, + values)); } connection()->addWindowEventListener(m_window, this); -- cgit v1.2.3