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invert_safe()
inverted_safe()
Matrix
Those two mimic our BLI invert_m4_m4_safe - they add a small offset to diagonal values, in case org matrix is degenerated, and if still non-invertible, return identity matrix. Org patch by me, final enhanced version by ideasman42, many thanks!
These are effectively public-domain, but use apache2.0 to avoid adding new licenses
