Hi,
Just to share (or have some suggestions) a way to avoid flickering when resizing or obscuring a window used through the gstxoverlay interface:
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//the first 3 lines turn off the "automatically redraw background"
gtk_widget_realize(area);gdk_window_set_back_pixmap(area->window, NULL, FALSE);
gtk_widget_set_app_paintable(area,TRUE); //The previous lines avoid flickering, but if we have a double buffer
//the problem is now due to the fact that the gstxoverlay interface give the XID
//of the "front buffer". (<- not exactly true but to make me understood)
//So when swaping buffers, there is this
ugly flickering effect too.
gtk_widget_set_double_buffered(area, FALSE);
//To keep double buffered, we should have to draw in the backbuffer
//but I do no know if there is a XID (HWND) for the backfuffer
//Yes I know there is only one XID (nothing to deal with front and back buffers)
//So I do not know a way to do that :P
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static GstBusSyncReply create_window (GstBus* bus, GstMessage* message, GtkWidget* widget)
{ // ignore anything but 'prepare-xwindow-id' element messages
if (GST_MESSAGE_TYPE (message) != GST_MESSAGE_ELEMENT) return GST_BUS_PASS;
if (!gst_structure_has_name (message->structure, "prepare-xwindow-id")) return GST_BUS_PASS;
g_print ("setting xwindow id\n");#ifdef WIN32
gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (GST_MESSAGE_SRC (message)), reinterpret_cast<gulong>GDK_WINDOW_HWND(widget->window));
#else gst_x_overlay_set_xwindow_id (GST_X_OVERLAY (GST_MESSAGE_SRC (message)),
GDK_WINDOW_XWINDOW(widget->window));#endif
gst_message_unref (message); return GST_BUS_DROP;
}------------------------------------------------------------------------------------------
static gboolean expose_cb(GtkWidget* widget, GdkEventExpose* event, GstElement* videosink)
{ gst_x_overlay_expose (GST_X_OVERLAY (videosink));
return FALSE;}------------------------------------------------------------------------------------------
(for information, with Qt the equivalent is widget->setAttribute(Qt::WA_NoSystemBackground); )
Sincerely
J.
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