Efficient rendering of masks to a screened buffer using a lookup table
US6529284B1 · kind B1 · utility
38Cited by
1References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 8, 1999 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Sep 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T1/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method and system for expanding a pixel bitmap mask. The pixel bitmap mask (102) is expanded by the use of a lookup table (104) to create an m*n bit expanded mask, where m is the depth of a screen and n is the number of pixels described by the original pixel bitmap mask (102). The expanded mask is logically ANDed with a foreground screen (106). The inverse of the expanded mask is logically ANDed with existing data in a screen buffer (108). The results of the two AND operations are logically OR'd to create a new screen buffer that is eventually sent to a printer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.