Scan-conversion process and processor for converting a graphic p

Details Scan-conversion process and processor for converting a graphic p Scan-conversion process and processor for converting a graphic p

1989-08-08

1992-05-19

Harkcom, Gary V.

G06F 1562

Patent

active

051154021

ABSTRACT:
A scan-conversion processor converts a graphic primitive defined by its outline to pixel data by storing edge data blocks containing the y-coordinates of the vertices of each edge, the x-coordinate of the lower vertex, and x-coordinate increment data. The edge blocks are linked in ascending order of teir minimum y-coordinate values into edge chains representing consecutive series of upward- or downward-inclined edges. Information indicating the edge inclination can also be stored in each edge data block, to support use of the non-zero-winding algorithm to discriminate between the interior and exterior of the graphic primitive. since it requires relatively little memory space, the scan-conversion processor, including its memory, can be implemented as a single integrated circuit on a semiconductor chip.

REFERENCES:
patent: 4815009 (1989-03-01), Blatin
patent: 4897805 (1990-01-01), Wang
patent: 4962468 (1990-10-01), Beauregard et al.

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