Graphics controller for forming a composite image

Details Graphics controller for forming a composite image Graphics controller for forming a composite image

1997-11-12

2000-10-31

Sax, Steven

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345149, G09G 500

Patent

active

061409944

ABSTRACT:
A graphics controller produces a composite image through selecting between input image pixels, which are designated to be displayed in the same pixel location, by using a select function. The select function is computed on a pixel by pixel basis to provide a select signal that indicates which pixel should be chosen for display as the final composite image on the display screen. The select signal uses mixing key functions to determine which pixel should be passed. The results of these functions are output in the form of key codes. Key codes are combined by performing a logical AND operation between the key codes, and with a Raster OPeration (ROP) code. The ROP code designates which key code combinations are to be logically ORed together to provide an increased number of possible key combinations to determine the selection of the image to be displayed.

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"Programmable Boolean Function Generator", by F.E. Sakalay, IBM Technical Disclosure Bulletin, vol. 21, No. 6, pp. 2474-2475, Nov. 1, 1978.

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