Re: Applying to a surface the alpha of other
Krzysztof Kosiński <[email protected]>
| Newsgroups | gmane.comp.lib.cairo |
|---|---|
| Message-ID | <CAFLw2WR_Xu0xvaQnnjTyMBMhzA8CaYDd+VgfeMDiqGNdM2CcFw@mail.gmail.com> |
2012/10/22 Bill Spitzak <[email protected]>: > He does not want to un-premultiply. I'm not so sure about this. Without un-premultiplication, the result is equivalent to painting the image with CAIRO_OPERATOR_OVER onto a black surface. With un-premultiplication, the result is as if the alpha was reset to zero while keeping the color intact. Regards, Krzysztof -- cairo mailing list [email protected] http://lists.cairographics.org/mailman/listinfo/cairo