Function scale_segments 

pub fn scale_segments(
    base: usize,
    min: usize,
    max: usize,
    q: TessellationQuality,
) -> usize

Scale a tessellator’s segment count by the selected quality level.

base is the segment count the call site computed by its own (possibly adaptive) rule; min/max are that site’s existing clamp bounds. At TessellationQuality::Medium the result is exactly base.clamp(min, max) — the historical value. Away from Medium, both base and the clamp bounds are scaled by TessellationQuality::density_factor, so detail genuinely rises or falls instead of saturating at the old cap. The result is monotonic non-decreasing across the five levels.