[cairo] question about the image backend

Cosmin Apreutesei cosmin.apreutesei at gmail.com
Sat Aug 11 14:41:44 PDT 2012


I want to create an OpenGL texture with the data from a cairo image
surface that I get with cairo_image_surface_get_data(). The data is in
BRGA format which works directly with glTexImage2D(). However, I
noticed that on this format, the alpha channel is lost (computed into
into the RGB values). Can I disable this processing so I can preserve
the alpha channel? Currently I'm undo'ing this before loading the
texture but it's slow, lossy, and screws with the data buffer (which
might confuse cairo, not sure).


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