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1. 发明申请

US20120075310A1 ARC SPLINE GPU RASTERIZATION FOR CUBIC BEZIER DRAWING 有权
标题翻译：用于CUBIC BEZIER绘图的ARC SPLINE GPU RASTERIZATION
公开(公告)号：US20120075310A1
公开(公告)日：2012-03-29
申请号：US12890760
申请日：2010-09-27
申请人： Ashraf A. Michail , David B. Teitlebaum , Brandon C. Furtwangler
发明人： Ashraf A. Michail , David B. Teitlebaum , Brandon C. Furtwangler
IPC分类号： G06T11/20
CPC分类号： G06T11/203
摘要： A curve drawing system is described herein that rasterizes arc splines in the GPU of a computer for cubic Bezier drawing of strokes and thin features. The curve drawing system first converts a cubic Bezier representation into an arc spline representation. Then the curve drawing system uses a similar approach to Loop/Blinn modified to cause the pixel shader to perform a point-in-circular-arc test instead of a point-in-Bezier test. Calculating arc radius is a much simpler operation than the alternatives and can be easily and efficiently performed by the pixel shader. Since the stroke of an arc spline is also an arc spline, the drawing system provides a resolution-independent representation of strokes. Thus, the curve drawing system allows several previously difficult graphical features to be efficiently drawn by readily available legacy hardware and used in software programs that are designed to run on a wide variety of hardware.
摘要翻译：本文描述了一种曲线绘制系统，其对计算机的GPU中的弧形样条进行光栅化，用于立方贝塞尔绘制笔画和薄特征。曲线绘制系统首先将立方贝塞尔表示转换为弧形样条表示。然后曲线绘制系统使用类似的Loop / Blinn方法进行修改，以使像素着色器执行圆弧圆弧测试，而不是Bezier点测试。计算圆弧半径比替代方案简单得多，可以通过像素着色器轻松有效地执行。由于圆弧花键的行程也是弧形花键，绘图系统提供了与分辨率无关的笔画表示。因此，曲线绘制系统允许通过易于获得的遗留硬件有效地绘制出先前困难的几个图形特征，并用于设计为在各种硬件上运行的软件程序。

2. 发明授权

US08624899B2 Arc spline GPU rasterization for cubic Bezier drawing 有权
标题翻译：用于立方贝塞尔绘图的弧形样条GPU光栅化
公开(公告)号：US08624899B2
公开(公告)日：2014-01-07
申请号：US12890760
申请日：2010-09-27
申请人： Ashraf A. Michail , David B. Teitlebaum , Brandon C. Furtwangler
发明人： Ashraf A. Michail , David B. Teitlebaum , Brandon C. Furtwangler
IPC分类号： G06F17/00 , G06T1/00 , G06T15/40
CPC分类号： G06T11/203
摘要： A curve drawing system is described herein that rasterizes arc splines in the GPU of a computer for cubic Bezier drawing of strokes and thin features. The curve drawing system first converts a cubic Bezier representation into an arc spline representation. Then the curve drawing system uses a similar approach to Loop/Blinn modified to cause the pixel shader to perform a point-in-circular-arc test instead of a point-in-Bezier test. Calculating arc radius is a much simpler operation than the alternatives and can be easily and efficiently performed by the pixel shader. Since the stroke of an arc spline is also an arc spline, the drawing system provides a resolution-independent representation of strokes. Thus, the curve drawing system allows several previously difficult graphical features to be efficiently drawn by readily available legacy hardware and used in software programs that are designed to run on a wide variety of hardware.
摘要翻译：本文描述了一种曲线绘制系统，其对计算机的GPU中的弧形样条进行光栅化，用于立方贝塞尔绘制笔画和薄特征。曲线绘制系统首先将立方贝塞尔表示转换为弧形样条表示。然后曲线绘制系统使用类似的Loop / Blinn方法进行修改，以使像素着色器执行圆弧圆弧测试，而不是Bezier点测试。计算圆弧半径比替代方案简单得多，可以通过像素着色器轻松有效地执行。由于圆弧花键的行程也是弧形花键，绘图系统提供了与分辨率无关的笔画表示。因此，曲线绘制系统允许通过易于获得的遗留硬件有效地绘制出先前困难的几个图形特征，并用于设计为在各种硬件上运行的软件程序。

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