slab: [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.
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