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APPROXIMATION OF STROKED HIGHER-ORDER CURVED SEGMENTS BY QUADRATIC BÈZIER CURVE SEGMENTS

机译:二次BÈZIER曲线段逼近高阶曲线段

摘要

One embodiment of the present invention sets forth a technique for subdividing stroked higher-order curved segments into quadratic Bèzier curve segments. Path stroking may be accelerated when a GPU or other processor is configured to perform the subdivision operations. Cubic Bèzier path segments are subdivided into quadratic Bèzier curve segments and other lower-order segments at key features. The quadratic Bèzier curve segments approximate the cubic Bèzier path segments. A variance metric is computed for each quadratic Bèzier curve segment, and when the variance metric indicates that the quadratic Bèzier curve segment deviates by more than a threshold from the corresponding portion of the cubic Bèzier path segment, the quadratic Bèzier curve segment is further subdivided. The path composed of the quadratic Bèzier curve segments is then stroked by rendering hull geometry that encloses the path.
机译:本发明的一个实施例提出了一种用于将笔划的高阶曲线段细分为二次贝塞尔曲线段的技术。当GPU或其他处理器配置为执行细分操作时,可以加快路径行程。在关键要素上,三次Bèzier路径段细分为二次Bèzier曲线段和其他低阶段。二次贝塞尔曲线线段近似于三次贝塞尔曲线路径段。为每个二次贝塞尔曲线段计算方差度量,并且当方差度量指示二次贝塞尔曲线段与三次贝塞尔路径段的对应部分相差超过阈值时,将进一步细分二次贝塞尔曲线段。然后,通过绘制包围路径的船体几何形状,对由二次Bèzier曲线段组成的路径进行描边。

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