s is pixel on screen.
c is new colour.
Value Action
0 s = c
1 s = s OR c
2 s = s AND c
3 s = s XOR c
4 s = NOT s
5 s = s (no change)
6 s = s AND NOT c
7 s = s OR NOT c
8-15 As 0-7 but background col is transparent.
16-31 Colour pattern 1, using action 0-15
32-47 Colour pattern 2, using action 0-15
48-63 Colour pattern 3, using action 0-15
64-79 Colour pattern 4, using action 0-15
80-95 Giant pattern, using action 0-15
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