Hi,
I try to find how to do inverted drawing. Meaning drawing twice the same
thing, restores the situation as was.
So i first tried agg2d, it has the enum BlendMode, and agg::comp_op_xor
is one of them, but that does not do the job.
But the agg::comp_op_invert nor agg::comp_op_invert_rgb, are not
mentioned there.
So i did add them there to see what happened, to bad they don't work
either.
And now i don't know anymore.
Do i need a premultiplied pixfmt to make this work??
Does someone of you know in what direction i should go,
Thanks,
Klaas
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