ALL0BITS
inverse = (bg != 0) ? ALL1BITS : ALL0BITS;
fgmask0 = (fg & 0x01) ? ALL1BITS : ALL0BITS;
fgmask1 = (fg & 0x02) ? ALL1BITS : ALL0BITS;
fgmask2 = (fg & 0x04) ? ALL1BITS : ALL0BITS;
fgmask3 = (fg & 0x08) ? ALL1BITS : ALL0BITS;
bgmask0 = (bg & 0x01) ? ALL1BITS : ALL0BITS;
bgmask1 = (bg & 0x02) ? ALL1BITS : ALL0BITS;
bgmask2 = (bg & 0x04) ? ALL1BITS : ALL0BITS;
bgmask3 = (bg & 0x08) ? ALL1BITS : ALL0BITS;