Method and system for eliminating frame tears from an output display
US6597364B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2000 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Oct 8, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2360/127
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for rendering computer graphics display tear-free is provided by determining a safe region for each associated block transfer command in real time. In response to a request of a graphics application program, a block transfer type is determined according to relative positions of a destination bitmap, and a source bitmap on the frame buffer. The invention defines three block transfer types: a top-down block transfer type, a bottom-up block transfer type and a direct block transfer type. Each of these block transfer types has an associated block transfer command for issuing to a command queue. After receiving each associated block transfer command, a safe region for an associated block transfer command will be determined in real time. Then, information from a source bitmap is transferred to a destination bitmap when the position of the current scan line is within the determined safe region defined for the associated block transfer command.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.