BLEND_ERASE
BLEND_ERASE(p, color.red, color.green, color.blue, *covers);
BLEND_ERASE(p, lowColor.red, lowColor.green, lowColor.blue,
BLEND_ERASE(p, lowColor.red, lowColor.green, lowColor.blue,
BLEND_ERASE(p, color.red, color.green, color.blue, cover);
BLEND_ERASE(p, color.red, color.green, color.blue, cover);
BLEND_ERASE(p, color.red, color.green, color.blue, *covers);