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CASA6

  • Josh Marvil

    Josh Marvil a00a67879f3b8170f273d04c57edd889d7b89f91

    CAS-14719: guard against division by zero in getCommonBeam ellipse transform
    _transformEllipseByScaling divides by 2*j1-1 = |u|/sqrt(f1), which is
    exactly zero when the scaled ellipse is circular (u = r - t = 0). That
    is an ordinary geometry, not a degenerate input, but the resulting
    0/0 evaluates to NaN; the enclosing GaussianBeam then fails
    setMajorMinor, and the exception propagates as a failed minor cycle
    in automasking. Reproduced on a 6-channel block whose beams share a
    single float32 minor axis and whose position angles differ by ~1e-8
    rad, so r and t land on the same double.

    Take the analytic limit (k = (r+t)/2 +- sqrt(s)) instead of dividing,
    and stop the enclosing-beam retry loop from rebuilding a non-finite
    beam inside its own catch handler. Also correct the circle branch,
    which returned sqrt(k) where the semi-axis is sqrt(1/k); it was
    unreachable before and is reachable now.