On Fri, Aug 10, 2012 at 1:22 PM, Jean Brefort
<jean.bref...@normalesup.org>wrote:
> This code is quite strange. Your call to cairo_set_source_surface() is
> not useful since you use cairo_set_source_rgb() just after. You should
> call cairo_paint() just after cairo_set_source_surface() if you want it
> to have any effect.
>
> If I do not call cairo_set_source_rgb(cr, 0, 0, 1); how will get a
blue rectangle?
Just having these is giving me a window with black background.
cairo_set_source_surface(cr, surface, 0, 0);
cairo_rectangle(cr, 300,300, 200, 200);
cairo_stroke(cr);
cairo_paint(cr).
Can you please clarify?
As I told, I would like to get a blue rectangle in offscreen surface and a
green rectangle in main visible surface so after final rendering of
offscreen contents on main window, I would get both rectangles on main
window.
Regards
Prasanta
> Hope it helps,
> Jean
>
> Le vendredi 10 août 2012 à 13:07 +0530, Prasanta Sadhukhan a écrit :
> > expose_event (GtkWidget *widget,GdkEventExpose *event, gpointer
> > data)
> > {
> > g_print("draw event main\n");
> >
> > cairo_t *cr = gdk_cairo_create(widget->window);
> > // draw blue rectangle into offscreen
> > cairo_set_source_surface(cr, surface, 0, 0);
> > cairo_set_source_rgb(cr, 0, 0, 1);
> > cairo_rectangle(cr, 300, 300, 200, 200);
> > cairo_stroke(cr);
> > cairo_paint(cr);
> >
> > //draw green rectangle onto main window
> > cairo_set_source_rgb(cr, 0, 1, 0);
> > cairo_rectangle(cr, 100, 100, 200, 200);
> > cairo_stroke(cr)
> > }
> >
> >
> >
>
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