Inside Macintosh: QuickDraw GX Environment and Utilities /

Chapter 8 - QuickDraw GX Mathematics / QuickDraw GX Mathematics Reference

Number-Conversion Macros / Format Conversions

ColorToFract

You can use the ColorToFract macro to convert a gxColorValue number to a fract number.

#define ColorToFract(a) (((fract)(a)<<14) + ((fract)(a) +2 >>2))

a

A gxColorValue number to be converted to a fract number.

macro result

A fract number having the same value as the gxColorValue number.