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mtlcl410andClaude Opus 5.5
7bcd89c816
A rectangle with no height or no width encloses no area, so the
rasteriser marked nothing for it. As a clip (`10 10 100 0 re W n`) it
hid everything painted after it; as a fill it fell back to a
thinnest-line stroke that half-covered two rows when the line lay on a
pixel boundary.
ISO 32000-2 §10.7.4 paints every pixel whose half-open square the shape
intersects, "no matter how small the intersection is" ("A zero-width or
zero-height rectangle paints a line 1 pixel wide"), and a clipping
region is "the set of pixels that would be included by a fill
operation".
hayro-interpret patch (65), `degenerate_fill_area`: a fill or clip whose
path has no width or no height (but not both) gets the device pixels the
line touches - whole pixels when it runs along a device axis, a band one
device pixel wide when a rotated CTM turns it. Points, and paths with
area however thin, paint as before.
Tests: crates/render/tests/it/zero_area_fill_clip.rs (5 of 8 fail with
the patch reverted; 9 mutants of the patch each fail a test).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0175FWj4xFhMhSH3UpMU8DSC