[cairo] RGB channels are set to zero if alpha is 0.

Sun Aug 27 18:55:32 UTC 2017

El domingo, 27 de agosto de 2017, Bram Stolk <b.stolk at gmail.com> escribió:
>
> I must say that PNG then makes for a very poor choice of writing to by
> Cairo.
>

Note that PNG support in Cairo is explicitly described as a "toy API",
intended to be used for testing and quick demos, but not much more.

Guillermo
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