Graphics display controller equipped with boundary searching cir

Details Graphics display controller equipped with boundary searching cir Graphics display controller equipped with boundary searching cir

1988-02-29

1990-07-24

Moore, David K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340747, 340799, 382 22, 382 48, G09G 100

Patent

active

049438018

ABSTRACT:
A graphics display controller equipped with a boundary search circuit is disclosed. There is provided a mask information generator generating mask information consisting of a plurality of bits in response to control data, at least one bit of the mask information taking non-mask data and the remaining bits thereof taking mask data. Each bit data of the mask information is supplied to the associated one of a plurality of mask gates along with the associated bit data of display data of one word read from a display memory. Each of the mask gates outputs the associated bit data of the display data when the associated mask information bit data is the non-mask data. The output data of the mask gates are supplied to a position information generator wherein the position information relative to a position of a bit taking a predetermined logic level is generated.

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Simmons et al.; "Polygon Filling in Graphics Display System"; IBM Technical Disclosure Bulletin; vol. 24 No. 1A; Jun. 1981.
Van Wyk; "Clipping to the Boundary of a Circular-Arc Polygon"; Computer Vision, Graphics, and Image Processing; Mar. 1984; pp. 383-392.

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