Struct FFIReticleHold 

#[repr(C)]
pub struct FFIReticleHold {
    pub down_mil: c_double,
    pub right_mil: c_double,
    pub nearest_mark: c_int,
    pub nearest_mark_distance_mil: c_double,
    pub off_reticle: c_int,
    pub mark_scale: c_double,
}

Where a firing solution lands in a reticle (MBA-1361).

A NEW appended struct — no existing repr(C) layout is touched by this addition, so existing callers need no recompile. All angles are milliradians from the optical center; down is positive BELOW center and right is positive to the shooter’s RIGHT (see crate::reticle for the full convention block).

Fields

down_mil: c_double

True angular milliradians below center. Equals the supplied drop_mil.

right_mil: c_double

True angular milliradians right of center. Equals the supplied wind_mil.

nearest_mark: c_int

Index of the nearest mark in the caller’s array, or -1 when there is none (unreachable today: an empty mark array is rejected before the search).

nearest_mark_distance_mil: c_double

Distance from the hold to that mark, milliradians, measured in TRUE angular space (i.e. after second-focal-plane scaling).

off_reticle: c_int

1 when the hold falls outside the marks’ bounding box grown by 20% of its span per axis, 0 otherwise.

mark_scale: c_double

The subtension scale applied to the marks: reference_magnification / magnification for a second-focal-plane reticle, exactly 1.0 for first focal plane.