发明名称 |
Filter and raster operations |
摘要 |
<p>A method and apparatus for handling transparency operatives simultaneously with raster operatives in a graphics environment. This is achieved by introducing filter operations to obtain the effect of transparency. Filter operations work cooperatively with grayscale and continuous-tone color raster operations. The introduction of filter operations, and their cooperation with raster operations allows this otherwise computationally complex problem to be served by a single hardware circuit for use in real-time applications such as monochrome and color laser printing. The solution is also applicable to displaying complex graphics on a video display device. A suitable apparatus receives graphics language commands which define the image to be displayed and generates a set of graphics orders from the graphics language commands representing the image to be displayed. The apparatus includes an image generator for generating a bitmap image from the graphics orders. A raster operation model is used for processing multiple-bit pixels in a source, in a pattern and in a destination, and a filter operation model is used for processing multiple-bit pixels in the source, pattern and destination. The raster operation model and the filter operation model operate cooperatively to modify the destination. <IMAGE></p> |
申请公布号 |
EP0817122(A2) |
申请公布日期 |
1998.01.07 |
申请号 |
EP19970301078 |
申请日期 |
1997.02.19 |
申请人 |
PEERLESS SYSTEMS CORPORATION |
发明人 |
HOROWITZ, JEFFREY R.;SCHMIDT, KENNETH A. |
分类号 |
G06F3/12;G06T1/00;G06T15/00;G06T15/50;G09G5/00;G09G5/36;G09G5/39;(IPC1-7):G06T11/00 |
主分类号 |
G06F3/12 |
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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