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Union of many paths in one coverage pass (#28) - #29
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Shapes of one paint drawn one after another leave seams where they abut or overlap along antialiased edges (1 − (1 − a)(1 − b) instead of a + b). A Union collects fills, strokes and shapes, and Canvas.FillUnion sums their coverage in one accumulator and composites once. - Stroker outlines wind one way everywhere (documented on LineSink, tested over random strokes); elements winding the other way (mirrored non-hairline strokes, fills by their exact signed area) are reversed. - Strokes keep the analytic path: Rasterizer.addStrip sums the closed-form rows into the accumulator band by band, so the union does not fall back to walking outline edges. - Shapes contribute their recorded edges and strips, so banded unions stroke once per page. EvenOdd fills and dense dashes are drawn on their own. - Tests against the supersampled union (overlapping/abutting rectangles of both orientations, dense hatches), single-element equality, bands, concurrency, zero allocations. ADR 0006 records the design and numbers. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_014ndd7AKiqjKUpYoL1CoEmU
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Shapes of one paint drawn one after another leave seams where they abut
or overlap along antialiased edges (1 − (1 − a)(1 − b) instead of a + b).
A Union collects fills, strokes and shapes, and Canvas.FillUnion sums
their coverage in one accumulator and composites once.
tested over random strokes); elements winding the other way (mirrored
non-hairline strokes, fills by their exact signed area) are reversed.
closed-form rows into the accumulator band by band, so the union does
not fall back to walking outline edges.
stroke once per page. EvenOdd fills and dense dashes are drawn on
their own.
of both orientations, dense hatches), single-element equality, bands,
concurrency, zero allocations. ADR 0006 records the design and numbers.
Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_014ndd7AKiqjKUpYoL1CoEmU