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vello_cpu 0.0.8's clip_color, shared by the nonseparable blend modes, divided 0 by 0 when a gray's equal components were rounded just below 0 or above 1 after set_lum. The NaN drew the pixel black at the source's alpha whatever the backdrop: nine gray levels under /BM /Color in an empty isolated group (0.96 g among them) rendered (0, 0, 0), and two more at half opacity came out wrong. Vendor vello_cpu 0.0.8 (Apache-2.0 OR MIT) with a backport of linebender/vello#2000, which clips only when the denominator is positive. No vello_cpu release carries the fix yet; drop the copy when one does. Tests in it::nonseparable_gray run every gray level. The two Color ramps fail with the unpatched blend.rs. The Luminosity ramp (black over each opaque gray, upstream's other case) passes either way here: pages use the u8 pipeline, and that case only failed in the f32 one; it stays as a guard. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SqmHYx8FiWM5PcsoiErgp9
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26 lines
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Copyright 2020 the Vello Authors
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