[cairo] Question about CAIRO_OPERATOR_SOURCE if paint operation doesn't cover whole target surface

[Carl Worth]

On Thu, 30 Nov 2006 18:40:57 -0600, Boris Zbarsky wrote:
> > 	cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
> > 	cairo_paint (cr);
>
> So this sets the destination surface to be uniformly rgba(0, 0, 0, 0)?

Yes, that's correct.

In your specific case, since you were just about to use
CAIRO_OPERATOR_SOURCE anyway, you could achieve the same result just
as easily with:

	cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
	cairo_set_source_rgba (cr, 0, 0, 0, 0);
	cairo_paint (cr);

> Thanks for the clarification,

You're welcome.

-Carl
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