Method and apparatus for high-speed block transfer of compressed and word-aligned bitmaps
CA 2249358 C · Owner: Rendition, Inc. · Inventors: Munshi, Aaftab A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Graphics display is performed by compressing pixel information by aligning , the 8, 16, or 32 bit pixels transferred over a 32-bit Peripheral Component Interface (PCI) bus (609) with the pixels in the display memory (612) and by , avoiding moves of pixel data within display memory (612). Compression is achieved by not transferring data for pixels that are not modified by the transfer. Rather, a count of unmodified pixel bytes to skip precedes each set of pixel data for contiguous pixels that are modified. Alignment is achieved by ensuring that the boundaries between words within the pixel set transferred matches those within the corresponding target pixels in the display memory …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed February 27, 1997 and granted September 16, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 27, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 27, 2019.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.