Graphic processor suitable for graphic data transfer and convers

Details Graphic processor suitable for graphic data transfer and convers Graphic processor suitable for graphic data transfer and convers

1988-03-30

1990-10-23

Harkcom, Gary V.

Boots, shoes, and leggings

364518, G06F 1562

Patent

active

049657500

ABSTRACT:
A graphic processor which controls reading, writing and transfer of graphic data for a display memory that stores graphic data. The processor includes a first unit which stores first address information for addressing the display memory and first pixel address information which points a pixel position in a word specified by the first address information, a second unit which stores second address information for addressing the display memory and second pixel address information which points a pixel position in a word specified by the second address information, a third unit which shifts graphic data of multiple pixels included in two consecutive words to extract continuous 1-word graphic data, and a fourth unit which implements drawing computations pixel-wise concurrently for one word depending on the number of pixels included in a word. Even if transfer source graphic data lies across two consecutive words, the processor fetches the source data in a single reading, processes the data word-wise at once, and stores the result in the display memory.

REFERENCES:
patent: 4549172 (1985-10-01), Welk
patent: 4667295 (1987-05-01), Preston, Jr.
patent: 4680720 (1987-07-01), Yoshii et al.
patent: 4718091 (1988-01-01), Kobayashi et al.
patent: 4720871 (1988-01-01), Chambers
patent: 4769632 (1988-09-01), Work et al.
Motorola M68000 Programmer's Reference Manual, fifth edition, 1986, pp. 2-1, B-58, B-59.
"Performance Evaluation of Various Enlargement/Reduction Methods for 2-Level Image Data and Method of Improving the Processing Speed", pp. 920-925 in the publication of Information Processing Society of Japan, vol. 26, No. 5, Sep. 1985.

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