Antialiasing method using barycentric coordinates applied to lines
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United States of America Patent
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Sep 14, 2004
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app pub date -
Jul 1, 1999
filing date -
Jul 1, 1999
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Abstract
A method for computing normalized minor axis distance to an ideal line for variable-width line antialiasing. The method involves performing line primitive setup by constructing a triangle from the two line vertices and a third vertex biased from a line endpoint by the line width/2. Normalized barycentric coordinates are computed for this triangle, which together can be used for primitive attribute interpolation. One of the barycentric coordinates contains the normalized minor-axis distance to the ideal line, which can be used with a slope-correct coverage table to compute coverage. Because the minor-axis distance is normalized, the coverage value is independent of line width.
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