[cairo] Problems with transparent background

[Lawrence D'Oliveiro]

On Wed, 22 Feb 2017 19:30:13 +0100, Martin Fischer wrote:

> gboolean expose(GtkWidget *widget, GdkEventExpose *event, gpointer
> data) {
>      cairo_t *cr = gdk_cairo_create(widget->window);
> 
>      if( glob.image == NULL )
> 		CreateBackground( cairo_get_target (cr));
> 		
>      cairo_rectangle(cr, event->area.x, event->area.y, 
> event->area.width, event->area.height);
>      cairo_clip(cr);
>      cairo_set_source_surface(cr, glob.image, 0, 0);

Maybe add

 	cairo_set_operator( cr, CAIRO_OPERATOR_SOURCE );

at some point before the following paint call?

>      cairo_paint(cr);