Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1994-02-04
1995-07-25
Powell, Mark R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
345155, 395775, G06F 1500
Patent
active
054370116
ABSTRACT:
The graphics data processor of the present invention offers as a single instruction in its instruction set a draw and advance operation. A first data register stores a set of X and Y coordinates. In a first embodiment, a predetermined color code is stored at the pixel address of a bit mapped display memory indicated by the X and Y coordinates the first data register upon execution of the draw and advance instruction. The X and Y coordinates stored in the first data register are then advanced by addition of X and Y coordinates stored In a second data register. A second embodiment is similar except that the color code stored at the X and Y coordinates of the first data register is recalled for combining with the predetermined color code and the combined result stored at that pixel location. The predetermined color code is preferably stored in another data register. By proper selection of the X and Y coordinate data stored in the second data register either the X or the Y coordinate may be altered alone or both may be simultaneously changed. Provision of signed X and Y coordinate values in the second register enables either the X or Y coordinate to be incremented or decremented. This instruction serves to enhance the speed at which a line or computed curve may be drawn in the bit mapped display.
REFERENCES:
patent: 3471848 (1969-10-01), Manber
patent: 3952297 (1976-04-01), Stauffer et al.
patent: 4197590 (1980-04-01), Sukonick et al.
patent: 4320395 (1982-03-01), Meissen et al.
patent: 4613852 (1986-09-01), Maruko
patent: 4636783 (1987-01-01), Omachi
patent: 4649377 (1987-03-01), Urabe
patent: 4653020 (1987-03-01), Cheselka et al.
patent: 4680643 (1987-07-01), Horiguchi
patent: 4761755 (1988-08-01), Ardini, Jr. et al.
patent: 4779210 (1988-10-01), Katsura et al.
patent: 4862150 (1989-08-01), Katsura et al.
patent: 5095301 (1992-03-01), Guttap et al.
Van Aken, Jerry, "An Efficient Ellipse-Drawing Algorithm", IEEE CG&A, 1984, pp. 24-35.
Guttag et al., "Video Display Processor", IEEE Translations on consumer electronics, vol. CE-27, Feb. 1981, pp. 27-34.
Guttag, Karl and John Hay, "Video Display Processor Simulates Three Dimensions", Electronics, Nov. 20, 1980, pp. 123-126.
NEC Electronics U.S.A. Inc., 1982 Catalog, Microcomputer Division, pp. 515-536, .mu.PD7220/GDC Graphics Display Controller.
Asal Michael D.
Guttag Karl M.
Novak Mark F.
Tebbutt Neil
Van Aken Jerry R.
Bassuk Lawrence J.
Donaldson Richard L.
Marshall Robert D.
Powell Mark R.
Texas Instruments Incorporated
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