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Replace the sample table + Newton-Raphson + bisection search with the closed-form solver of bezier-easing 3.2: exact (~1e-14 instead of up to ~1e-3), no backward jump on steep curves such as (1, 0, 0, 1), faster. Inputs outside [0, 1] now saturate to 0 / 1 instead of going through the old search, which returned arbitrary values there.
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Hey @bartlomiejbloniarz @javache 👋, could you take a look when you have a moment? |
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Thanks for contributing this back to our super-old fork! |
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Oct 26, 2026
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@javache has imported this pull request. If you are a Meta employee, you can view this in D127563019. |
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This pull request was successfully merged by @greweb in 2ae713e When will my fix make it into a release? | How to file a pick request? |
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Summary:
Hi, this is @gre, I'm the author of bezier-easing, which is also embedded in this project (
packages/react-native/Libraries/Animated/bezier.js). The library was recently improved with better performance and more reliability, and I wanted to backport the benefits here.This brings its 3.2 solver (closed-form, no sample table):
Easing.bezier(1, 0, 0, 1)(0.4996)returned 0.348 instead of 0.431, and the value went backwards around the middle.Easing.ease) to ~1e-14.Easing.bezier(0.25, 0.1, 0.25, 1)(-0.5)gave 0.39). This is visible withinterpolate+extrapolate: 'extend'. Linear curves are unchanged.Changelog:
[GENERAL] [FIXED] -
Easing.bezier: fix wrong values on steep curves such as(1, 0, 0, 1); input outside [0, 1] now saturatesTest Plan:
bezier-itest.js.yarn fantom packages/react-native/Libraries/Animated/passes, andyarn flow check, eslint and prettier are clean.