[YAPC] X11 pixels operations (for reference)

[CHiPs44]

From https://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.html:

Function	Operation
Clear	0
And	src AND dst
AndReverse	src AND (NOT dst)
Copy	src
AndInverted	(NOT src) AND dst
NoOp	dst
Xor	src XOR dst
Or	src OR dst
Nor	(NOT src) AND (NOT dst)
Equiv	(NOT src) XOR dst
Invert	NOT dst
OrReverse	src OR (NOT dst)
CopyInverted	NOT src
OrInverted	(NOT src) OR dst
Nand	(NOT src) OR (NOT dst)
Set	1

(cf. https://web.archive.org/web/20220116094036/https://www.hpl.hp.com/techreports/Compaq-DEC/WRL-93-1.pdf)