[cairo] How to flatten several data surfaces with transparency

[Emmanuel Pacaud]

Hi,

Le lundi 05 novembre 2012 à 16:24 +0100, Steve Moreau a écrit :
> I was playing with cairo to flatten several layers with transparency.

I don't know if it can solve your issue, but if you alter surface data
by accessing directly the memory buffer, you have to use
cairo_surface_mark_dirty. If you forget this call, cairo may discard
what you have done.

	Emmanuel.