Video graphics controller with improved calculation capabilities

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G06F 1500

Patent

active

056130546

ABSTRACT:
Line draw circuitry receives parameters defining first and second endpoints of a line and calculates line parameters based on the first and second endpoints. The line parameters are then stored in a memory. A "calculate-only" control signals determines whether a line is drawn immediately after calculation (and storing) of the end parameters or whether the line is drawn responsive to a subsequent "start" signal. If the line is to be drawn responsive to the start signal, the line parameters may be modified prior to drawing the line.

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"Algorithm for Computer Control of a Digital Plotter", by J.E. Bresenham, IBM Systems Journal, vol. 4, No. 1, 1965, pp. 25-30.
"Ambiguities in Incremental Line Rastering", J. E. Bresenham, IEEE Computer Graphics & Applications, vol. 7, No. 1, Jan. 1987, pp. 31-43.
"Raster Graphics Drawing Hardware", Bowater et al., IBM Technical Disclosure Bulletin, vol. 27, No. 8, Jan. 1985, pp. 4618-4622.

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