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Every pixel of a (2r+1)^2 window shares one fractional offset per level and iteration, but lk_point called Plane::sample (with a libm floor, a bounds test and the clamp path) up to three times per pixel. The offset and the clamped column/row index tables are now computed once per window and the pixels run the same lerps on integer indices. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>