Method and apparatus for pixel clipping source and destination w

Details Method and apparatus for pixel clipping source and destination w Method and apparatus for pixel clipping source and destination w

1991-05-06

1994-03-22

Nguyen, Phu K.

395157, G06F 1562, G06G 108

Patent

active

052972518

ABSTRACT:
A method of moving blocks of pixel data, including window-identifying data, from a source area to a destination area within a frame buffer in a computer graphics system comprises the steps of: reading a block of pixel data from the source area into a pixel cache memory; combining source tiles with destination tiles in the cache; comparing pixel window identifiers read from the frame buffer with a pixel window identifier previously stored in the memory to determine whether the pixel window identifiers read from the frame buffer match the previously stored pixel window identifier; discarding each pixel whose corresponding window identifier does not match the previously stored window identifier; and updating the frame buffer with the pixel data not discarded.

REFERENCES:
patent: 4769636 (1988-09-01), Iwami et al.
patent: 4862389 (1989-08-01), Takagi
patent: 5001469 (1991-03-01), Pappas et al.

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