Window border generation in a bitmapped graphics workstation

Details Window border generation in a bitmapped graphics workstation Window border generation in a bitmapped graphics workstation

1985-07-09

1987-12-01

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340724, 340723, 340799, G09G 116

Patent

active

047107618

ABSTRACT:
Window border generating circuitry in a bitmapped graphics workstation. The workstation includes a host processor, a raster scanned graphics display device and means for controlling the display of data in one or more windows on the screen of the display device. An individual bitmap is provided for each window. At any given time, display data is retrieved from one of the bitmaps associated with a window presently being refreshed. Circuitry detects when the screen raster is located at a position at which a border of a window is to be displayed. Other circuitry responds to this condition by substituting for the display data from the bitmaps predefined signals for generating the screen borders.

REFERENCES:
patent: 4451895 (1984-05-01), Sliwkowski
patent: 4490797 (1984-12-01), Staggs et al.
patent: 4533910 (1985-08-01), Sukonick et al.
patent: 4550315 (1985-10-01), Bass et al.
Steven Dines et al, "Data Handling for Advanced Vdu Facilities," Electronic Product Design (Mar. 1984), pp. 53-58.
Leo J. Guibas et al, "A Language for Bitmap Manipulation," ACM Transactions on Graphics, vol. 1, No. 3 (Jul. 1982), pp. 191-214.
Gary C. Staas, "New Display Station Offers Multiple Screen Windows and Dual Data Communications Ports," Hewlett-Packard Journal (Mar. 1981), pp. 3-8.
Srinivas Sukumar et al, "Hardware and Firmware Support for Four Virtual Terminals in One Display Station," Hewlett-Packard Journal (Mar. 1981), pp. 13-15.
Richard Palm et al, "LSI Building Blocks Enhance Performance of Compact Displays," Electronic Design (Jul. 12, 1984), pp. 175-185.

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