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short fcurve_are_keyframes_usable(struct FCurve *fcu);
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/* Can keyframes be added to F-Curve? */
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/* -------- Curve Sanity -------- */
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void calchandles_fcurve(struct FCurve *fcu);
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void sort_time_fcurve(struct FCurve *fcu);
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short test_time_fcurve(struct FCurve *fcu);