Rapid graphics bit mapping circuit and method
US4648049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 1984 |
| Grant date | Mar 3, 1987 |
| Priority date | — |
| Expiry date | May 7, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit and method for a display controller especially adapted for display memories organized in arrays. The invention permits high speed modification of the contents of a display by generating the address signals of a selected linear pattern as the data block to be modified is retrieved from the display memory. For vectors, the addresses are generated in the same time as required for data block retrieval. The invention also permits calculation of the addresses of simple curves as the data block to be modified is retrieved, though calculation times typically are longer than for vectors. Modified Breshenham's algorithm is used for the address calculation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.