| 摘要 |
PROBLEM TO BE SOLVED: To efficiently store data in a memory unit by constituting a device so as to decrease the number of page breaks when exchanging data from a memory. SOLUTION: Polygons A and B are linearly rasterized while using data from a memory 70, for example, for decreasing the number of page breaks to occur in the case of rasterizing a polygon. As a result of tiled configuration concerning pages in the memory 70, the page breaks occur caused by just a little scan lines and it is clearly a contrast with conventional procedures. Concerning the polygon A, for example, any page break does not occur on a scan line 1-6 at all and the first page break occurs between scan line segments 6 and 7. The combination of tiled memory configuration of the polygon A and its linear rasterizing causes page breaks totally for 27 pages, and while rasterizing the entire polygon, just one page break occurs between scan lines 9 and 10. |
