Method and apparatus for high speed graphics data compression

Details Method and apparatus for high speed graphics data compression Method and apparatus for high speed graphics data compression

1992-08-11

1997-10-21

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345200, G09G 500

Patent

active

056801610

ABSTRACT:
A method and apparatus for controlling the display of graphics data, in which the data are compressed for dense storage in a graphics memory. The densely packed data can be asynchronously read from the memory and reformatted into a format suitable for driving a conventional display device. The memory comprises an array of memory locations, each location having capacity to store a first number of bits. The apparatus includes a graphics controller capable of densely packing compressed data words into the memory locations, where each compressed word comprises a second number of bits corresponding to a pixel. The graphics controller can densely pack the compressed words in the sense that it can write both a first word and a first portion of a second word into one memory location, and a second portion of the second word (with at least a portion of a third word) in a second memory location. In preferred embodiments, the apparatus of the invention receives 32-bit video data (with corresponding host addresses) and compresses each 32-bit word into a 24-bit pixel for dense packing in a video memory having 32-bit memory locations.

REFERENCES:
patent: 3974493 (1976-08-01), de Cavaignac et al.
patent: 4368466 (1983-01-01), Dwire
patent: 4862154 (1989-08-01), Gonzalez-Lopez
patent: 4868557 (1989-09-01), Perlman
patent: 4884069 (1989-11-01), Farand
patent: 5269003 (1993-12-01), Roskowski et al.
Macintosh Display Cards 4.circle-solid.8 and 8.circle-solid.24, Developer Note, Apr. 2, 1990, pp. 1 - 32, Developer Technical Publications, Apple Computer, Inc.

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