[Fluxus] png diagonal oddness

[gabor papp]

> Clearly it works as intended or within the realms of what is possible, but
> it does not work as the documentation implies it should work. A note and a
> possible warning could save hours there.
i'm not sure about what the opengl specs say about this. texture size 
has to be power of 2 on older cards. so 2x2 should work. with npot 
(non-power-of-two) texture capable cards, i think the specs does not 
mention any restrictions. most cards support npot textures nowadays. 
this bug was bothering me as well some time ago, when i found out about 
this size restriction by experiment. so i'm not really sure if it's an 
opengl requirement or not.

gabor