| 摘要 |
<p>In an electronic printing system having a memory for storing graphical objects in outline form as splines, the method of rapidly converting the graphical objects in outline form as splines to raster bit map form for imaging pixels on a raster device. The method comprises the steps of allocating a set of memory locations for output bit maps and initializing the memory locations, operating a stepper routine for each spline in a set of splines including the step of resolving diagonal operations into either x-y or y-x orthogonal steps to produce a quasi-outline of the graphical object and storing the quasi-outline in said memory locations, Exclusive OR Gating each successive raster scan line of the object with the result of the Exclusive OR Gating of the preceding scan line to fill in the graphical object, and producing the graphical object on said raster device.</p> |
