=> R0 = &BBGGRR00 of colour
R1 = flags
R2 = pointer to 64 byte block (128 bytes if b0 set)
<= R0 = distance of returned colour from that requested, if b0 set
R1 = pointer to name, or -1 if could not be matched
This SWI converts a colour number into a colour name. The 'best match' rule uses the same weightings as the ColourTrans module (R=2, G=4, B=1).
RGB_EncodeName flags
Bit Meaning if set
0 find best match without resorting to #rrggbb, otherwise find exact match
others reserved, must be 0
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