Radial Blur prepares its sample transforms once per filter (blur::radial::Plan) and shares them across output tiles, reading each bilinear tap once with channels kept together. Output is identical to the previous sampler at Draft, Good and Best, across colour models and depths (tests compare against the unchanged reference path); a failed table allocation falls back to that sampler. Measured on 24 MP RGBA8, Good, amount 1: Spin 66.1 -> 16.4 s, Zoom 19.2 -> 5.4 s (bench_radial example, docs/radial-blur-performance.md).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
