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dtourolleandClaude Opus 5 c9305fd0e6 Write out the derivation behind every kernel width these tests assert

A test that cannot be run cannot be checked by running it, and a number
copied out of a test run agrees with whatever the code did on the day.
Each asserted kernel width, tolerance and overshoot bound now carries the
arithmetic that produces it -- the shorter edge, the sigma, the
truncation at two sigmas, and where the rounding falls -- so a reader can
verify the expectation against the recipe without a GPU or a compiler.

Also records the two places where a bound is a bound and not a
measurement: the tolerance in the frame-fraction test is exactly what
rounding a kernel to a whole pixel costs on the smallest frame it uses,
and the halo test's floor and ceiling bracket a peak derived from the
step, the soft limit and the midtone taper rather than from a run.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-08-22 19:18:13 +02:00

base_curve.rs

Prove on a device that the profile reaches the screen

2026-08-22 14:40:51 +02:00

detail_stage.rs

Let an operation read the pixel next to it, and settle where sharpening belongs

2026-08-22 14:39:35 +02:00

local_adjustments.rs

Paint a mask without ever rasterising one on the CPU

2026-08-22 12:37:42 +02:00

local_contrast.rs

Write out the derivation behind every kernel width these tests assert