diff options
Diffstat (limited to 'src/plugins/platforms/qnx/qqnxrootwindow.cpp')
-rw-r--r-- | src/plugins/platforms/qnx/qqnxrootwindow.cpp | 59 |
1 files changed, 56 insertions, 3 deletions
diff --git a/src/plugins/platforms/qnx/qqnxrootwindow.cpp b/src/plugins/platforms/qnx/qqnxrootwindow.cpp index dddadb5ca8..5d58890c51 100644 --- a/src/plugins/platforms/qnx/qqnxrootwindow.cpp +++ b/src/plugins/platforms/qnx/qqnxrootwindow.cpp @@ -60,7 +60,8 @@ static const int MAGIC_ZORDER_FOR_NO_NAV = 10; QQnxRootWindow::QQnxRootWindow(const QQnxScreen *screen) : m_screen(screen), m_window(0), - m_windowGroupName() + m_windowGroupName(), + m_translucent(false) { qRootWindowDebug() << Q_FUNC_INFO; // Create one top-level QNX window to act as a container for child windows @@ -122,7 +123,10 @@ QQnxRootWindow::QQnxRootWindow(const QQnxScreen *screen) if (result != 0) qFatal("QQnxRootWindow: failed to set window size, errno=%d", errno); - // Fill the window with solid black + // Fill the window with solid black. Note that the LSB of the pixel value + // 0x00000000 just happens to be 0x00, so if and when this root window's + // alpha blending mode is changed from None to Source-Over, it will then + // be interpreted as transparent. errno = 0; val[0] = 0; result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_COLOR, val); @@ -152,13 +156,62 @@ QQnxRootWindow::QQnxRootWindow(const QQnxScreen *screen) qFatal("QQnxRootWindow: failed to set window source size, errno=%d", errno); errno = 0; - val[0] = 1; + val[0] = 0; val[1] = 0; result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_SOURCE_POSITION, val); if (result != 0) qFatal("QQnxRootWindow: failed to set window source position, errno=%d", errno); createWindowGroup(); + + // Don't post yet. This will be lazily done from QQnxScreen upon first posting of + // a child window. Doing it now pre-emptively would create a flicker if one of + // the QWindow's about to be created sets its Qt::WA_TranslucentBackground flag + // and immediately triggers the buffer re-creation in makeTranslucent(). +} + +void QQnxRootWindow::makeTranslucent() +{ + if (m_translucent) + return; + + int result; + + errno = 0; + result = screen_destroy_window_buffers(m_window); + if (result != 0) { + qFatal("QQnxRootWindow: failed to destroy window buffer, errno=%d", errno); + } + + QRect geometry = m_screen->geometry(); + errno = 0; + int val[2]; + val[0] = geometry.width(); + val[1] = geometry.height(); + result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_BUFFER_SIZE, val); + if (result != 0) { + qFatal("QQnxRootWindow: failed to set window buffer size, errno=%d", errno); + } + + errno = 0; + result = screen_create_window_buffers(m_window, 1); + if (result != 0) { + qFatal("QQNX: failed to create window buffer, errno=%d", errno); + } + + // Install an alpha channel on the root window. + // + // This is necessary in order to avoid interfering with any particular + // toplevel widget's QQnxWindow window instance from showing transparent + // if it desires. + errno = 0; + val[0] = SCREEN_TRANSPARENCY_SOURCE_OVER; + result = screen_set_window_property_iv(m_window, SCREEN_PROPERTY_TRANSPARENCY, val); + if (result != 0) { + qFatal("QQnxRootWindow: failed to set window transparency, errno=%d", errno); + } + + m_translucent = true; post(); } |