func cNewSurfacePattern(p *C.cairo_pattern_t) (Pattern, error) {
var s *C.cairo_surface_t
C.cairo_pattern_get_surface(p, &s)
C.cairo_surface_reference(s) //returned surface does not up libcairo refcount
S, err := XtensionRevivifySurface(p)
if err != nil {
return nil, err
}
P := SurfacePattern{
XtensionPattern: XtensionNewPattern(p),
s: S,
}
return P, nil
}
// reference is a wrapper around cairo_surface_reference().
func (v *Surface) reference() {
v.surface = C.cairo_surface_reference(v.native())
}
func registerImageSurface(m Surface, from *C.cairo_surface_t) {
mismux.Lock()
defer mismux.Unlock()
//let original from be collected, we just need a general handle
mis[m.id()] = C.cairo_surface_reference(from)
}
//GroupTarget returns the current destination surface for c.
//If there have been no calls to PushGroup/PushGroupWithContent,
//this is equivalent to Target.
//Otherwise,
//Originally cairo_get_group_target.
func (c *Context) GroupTarget() (Surface, error) {
s := C.cairo_get_group_target(c.c)
s = C.cairo_surface_reference(s)
return XtensionRevivifySurface(s)
}
