sixteen digit colour code?

Question

I am trying to convert the mac4lin awn theme from 0.3 to 0.4 so it will work in my awn. But I'm not sure about the colour codes in the 0.4 files. They are not normal hex codes, they are sixteen digits and look like this:

ghistep1 = #f2f2caca00001212
ghistep2 = #f2f2caca00001212

The ones in the 0.3 look like this:

glass_histep_2 = FFFFFF00
glass_histep_1 = FFFFFF2C

How do I convert the colour codes? What are they?

Answer 1

As long as the gamma is the same, you can take each 8-bit part of the 32-bit color code, and handle it as unsigned in the range 0 to 255. Multiply it by 257 (not 256) (or add it to itself shifted left by 8 bit positions). This gives you values in the range 0 to 65535 in intervals of 257. That should look the same complete with 8-bit like contouring. The alpha channel MAY need different processing. Then reconstruct it as the 64-bit color code. How you do this depends on your programming language.

Answer 2

They're 64-bit RGBA codes in the form RRRRGGGGBBBBAAAA. Simply scale the smaller colors to fit. Although the smaller colors may work once they're completed.