lab [Apple]
1. n. A continuous horizontal line of pixels,
all with the same color. 2. vi. To paint a slab on an output
device. Apple's QuickDraw, like most other professional-level
graphics systems, renders polygons and lines not with Bresenham's
algorithm, but by calculating `slab points' for each scan line
on the screen in succession, and then slabbing in the actual image
pixels....