发明名称 |
Graphics controller for forming a composite image |
摘要 |
A graphics controller produces a composite image through selecting between input image pixels, which are designated to be displayed in the same pixel location, by using a select function. The select function is computed on a pixel by pixel basis to provide a select signal that indicates which pixel should be chosen for display as the final composite image on the display screen. The select signal uses mixing key functions to determine which pixel should be passed. The results of these functions are output in the form of key codes. Key codes are combined by performing a logical AND operation between the key codes, and with a Raster OPeration (ROP) code. The ROP code designates which key code combinations are to be logically ORed together to provide an increased number of possible key combinations to determine the selection of the image to be displayed.
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申请公布号 |
US6140994(A) |
申请公布日期 |
2000.10.31 |
申请号 |
US19970968679 |
申请日期 |
1997.11.12 |
申请人 |
PHILIPS ELECTRONICS N.A. CORP. |
发明人 |
SCHAFFSTEIN, MICHAEL J.;WALSH, CHRISTOPHER |
分类号 |
G09G5/06;G06T3/40;G09G5/00;(IPC1-7):G09G5/00 |
主分类号 |
G09G5/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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