Multiplexor implementation for raster operations including foreground and background colors
US4958146A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 1988 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Oct 14, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/393
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mulitplexor implementation of circuitry for performing Boolean raster operation in a workstation whose functions include the display of graphics images using multiple planes and having foreground and background colors. The invented circuitry includes a plane raster-op select circuit and Boolean raster-op circuit. The plane raster-op select circuit selects a Boolean raster operation to be performed for each plane of graphics information as a function of foreground and background color control signals. The selected Boolean raster operation for each plane is then input to set of mulitplexors and the selected Boolean raster operation is performed on the control inputs to the multiplexors which combines source and destination data for each plane according to the selected Boolean operation for that plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.