Lighthouse xcb and xlib: Add support for transparency of GLX windows.

Merge-request: 1231
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>
(cherry picked from commit a3b627e1c5ce03a2500ab35c64729b1995639dcc)

3 files changed, 19 insertions, 6 deletions

diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 0456638ab9..3365c22c39 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -131,13 +131,17 @@ QXcbWindow::QXcbWindow(QWidget *tlw)
         visualInfo = XGetVisualInfo(DISPLAY_FROM_XCB(this), VisualIDMask, &visualInfoTemplate, &matchingCount);
 #endif //XCB_USE_GLX
         if (visualInfo) {
+            m_depth = visualInfo->depth;
+            m_format = (m_depth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
             Colormap cmap = XCreateColormap(DISPLAY_FROM_XCB(this), m_screen->root(), visualInfo->visual, AllocNone);
 
             XSetWindowAttributes a;
+            a.background_pixel = WhitePixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
+            a.border_pixel = BlackPixel(DISPLAY_FROM_XCB(this), m_screen->screenNumber());
             a.colormap = cmap;
             m_window = XCreateWindow(DISPLAY_FROM_XCB(this), m_screen->root(), tlw->x(), tlw->y(), tlw->width(), tlw->height(),
                                       0, visualInfo->depth, InputOutput, visualInfo->visual,
-                                      CWColormap, &a);
+                                      CWBackPixel|CWBorderPixel|CWColormap, &a);
 
             printf("created GL window: %d\n", m_window);
         } else {
@@ -147,6 +151,8 @@ QXcbWindow::QXcbWindow(QWidget *tlw)
 #endif //defined(XCB_USE_GLX) || defined(XCB_USE_EGL)
     {
         m_window = xcb_generate_id(xcb_connection());
+        m_depth = m_screen->screen()->root_depth;
+        m_format = (m_depth == 32) ? QImage::Format_ARGB32_Premultiplied : QImage::Format_RGB32;
 
         Q_XCB_CALL(xcb_create_window(xcb_connection(),
                                      XCB_COPY_FROM_PARENT,            // depth -- same as root
diff --git a/src/plugins/platforms/xcb/qxcbwindow.h b/src/plugins/platforms/xcb/qxcbwindow.h
index e049837253..20b464061a 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.h
+++ b/src/plugins/platforms/xcb/qxcbwindow.h
@@ -44,6 +44,7 @@
 
 #include <QtGui/QPlatformWindow>
 #include <QtGui/QPlatformWindowFormat>
+#include <QtGui/QImage>
 
 #include <xcb/xcb.h>
 #include <xcb/sync.h>
@@ -74,6 +75,8 @@ public:
     QPlatformGLContext *glContext() const;
 
     xcb_window_t window() const { return m_window; }
+    uint depth() const { return m_depth; }
+    QImage::Format format() const { return m_format; }
 
     void handleExposeEvent(const xcb_expose_event_t *event);
     void handleClientMessageEvent(const xcb_client_message_event_t *event);
@@ -99,6 +102,9 @@ private:
     xcb_window_t m_window;
     QPlatformGLContext *m_context;
 
+    uint m_depth;
+    QImage::Format m_format;
+
     xcb_sync_int64_t m_syncValue;
     xcb_sync_counter_t m_syncCounter;
 
diff --git a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
index 718f09383c..38c01f9cfd 100644
--- a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
@@ -58,7 +58,7 @@
 class QXcbShmImage : public QXcbObject
 {
 public:
-    QXcbShmImage(QXcbScreen *connection, const QSize &size);
+    QXcbShmImage(QXcbScreen *connection, const QSize &size, uint depth, QImage::Format format);
     ~QXcbShmImage() { destroy(); }
 
     QImage *image() { return &m_qimage; }
@@ -81,7 +81,7 @@ private:
     QRegion m_dirty;
 };
 
-QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
+QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QImage::Format format)
     : QXcbObject(screen->connection())
     , m_gc(0)
     , m_gc_window(0)
@@ -91,7 +91,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
                                           size.width(),
                                           size.height(),
                                           XCB_IMAGE_FORMAT_Z_PIXMAP,
-                                          screen->depth(),
+                                          depth,
                                           0,
                                           ~0,
                                           0);
@@ -111,7 +111,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size)
     if (shmctl(m_shm_info.shmid, IPC_RMID, 0) == -1)
         qWarning() << "QXcbWindowSurface: Error while marking the shared memory segment to be destroyed";
 
-    m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, screen->format());
+    m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, format);
 }
 
 void QXcbShmImage::destroy()
@@ -232,9 +232,10 @@ void QXcbWindowSurface::resize(const QSize &size)
     QWindowSurface::resize(size);
 
     QXcbScreen *screen = static_cast<QXcbScreen *>(QPlatformScreen::platformScreenForWidget(window()));
+    QXcbWindow* win = static_cast<QXcbWindow *>(window()->platformWindow());
 
     delete m_image;
-    m_image = new QXcbShmImage(screen, size);
+    m_image = new QXcbShmImage(screen, size, win->depth(), win->format());
     Q_XCB_NOOP(connection());
 
     m_syncingResize = true;