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Exact Polygonal Filtering: Using Green's Theorem and Clipping for Anti-Aliasing
Efficient filtering of polygonal shapes with closed-form solutions based on Green’s theorem with piecewise-polynomial filters (e.g. box/bilinear/bicubic).
Filtering is a key component of anti-aliasing, which is used to reduce the visual artifacts that occur when rendering high-frequency content at a lower resolution. Browsers' built-in anti-aliasing for SVG and Canvas shapes, particularly when animated, usually does not include a significant amount of filtering. Both approaches will typically hierarchically clip the polygon into smaller pieces (on the GPU, using the edge-clipped form noted in Alpenglow documentation).
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