_DrawColorRamp
void _DrawColorRamp(BRect rect, BView* target,
_DrawColorRamp(_RampFrame(0), target, white, compColor, 0, false,
_DrawColorRamp(_RampFrame(1), target, red, compColor, 0, false,
_DrawColorRamp(_RampFrame(2), target, green, compColor, 0, false,
_DrawColorRamp(_RampFrame(3), target, blue, compColor, 0, false,