Struct Jiggler

struct Jiggler<'a, C, D>
where
    C: PointCoord,
    D: PointCoord + From<C>,
{
    points: &'a [Point<C>],
    out_points: &'a mut [Point<D>],
}

Fields

points: &'a [Point<C>]

out_points: &'a mut [Point<D>]

Implementations

impl<C, D> Jiggler<'_, C, D>

where C: PointCoord, D: PointCoord + From<C>,

fn shift(&mut self, range: RangeInclusive<usize>, ref_ix: usize) -> Option<()>

Shift the coordinates of all points in the specified range using the difference given by the point at ref_ix.

Modeled after the FreeType implementation: https://github.com/freetype/freetype/blob/bbfcd79eacb4985d4b68783565f4b494aa64516b/src/truetype/ttgxvar.c#L3776

fn interpolate( &mut self, range: RangeInclusive<usize>, ref_points: RefPoints, ) -> Option<()>

Interpolate the coordinates of all points in the specified range using ref1_ix and ref2_ix as the reference point indices.

Modeled after the FreeType implementation: https://github.com/freetype/freetype/blob/bbfcd79eacb4985d4b68783565f4b494aa64516b/src/truetype/ttgxvar.c#L3813

For details on the algorithm, see: https://learn.microsoft.com/en-us/typography/opentype/spec/gvar#inferred-deltas-for-un-referenced-point-numbers