METHOD AND SYSTEM FOR USING SINGLE OSD PIXMAP ACROSS MULTIPLE VIDEO RASTER SIZES BY CHAINING OSD HEADERS

摘要

A TV SYSTEM THAT USES A SINGLE PIXMAP (190) ACROSS MULTIPLE VIDEO RASTERS HAVING DIFFERENT RASTERS SIZES. IN GENERAL , THE TV SYSTEM USES AT LEAST TWO SETS OF HEADERS (198, 200) TO SELECT DIFFERENT PORTIONS OF A SINGLE PIXMAP (190) TO BE DISPLAYED BASED ON DIFFERENT RASTERS SIZES. SPECIFICALLY , EACH OF THE HEADERS IN A HEADER SET POINTS TO APIXEL LINE TO SELECT NUMBER OF PIXELS FOR THTA PIXEL LINE. THE NUMBER OF THE HEADERS IN A HEADER SET DETERMINES THE HEIGHT OF THE PIXMAP (190) AND THE PIXEL NUMBER SELECTION BY A SET OF HEADERS DETERMINES THE WIDTH OF THE PIXMAP (190). IN RESPONSE TO DIFFERENT DISPLAYING MODES, THE TV SYSTEM SELECTIVELY INVOKES ONE OF THE TWO HEADER SETS (198, 200) TO SELECT DIFFERENT PORTIONS OF THE SINGLE PIXMAP (190). BY DOING SO, A SINGLE PIXMAP (190) CAN BE USED ACROSS MULTIPLE VIDEO RASTERS HAVING DIFFERENT RASTERS SIZES.