[cairo] bounded operators

[M Joonas Pihlaja]

On Sat, 6 Nov 2010, L A wrote:

> Probably a stupid question: why are CAIRO_OPERATOR_SOURCE and
> CAIRO_OPERATOR_CLEAR not bounded? _cairo_operator_bounded_by_source
> call seems to be returning false for these two.

SOURCE isn't source-bounded because it's supposed to faithfully copy
the source to the destination.

CLEAR isn't source-bounded because it's supposed to ignore the source.

Both are mask-bounded, however.

Joonas