Store symbol outlines as point chains, and keep glyph advances whole

Format 2 (VEGASYM2) writes each contour as a chain of 4-byte points, on or
off the curve as in TrueType: endpoints are shared, lines have no control
point, and two off points imply the on point between them. A curve is still
had from one point and its two neighbours, so a GPU can point at curves by
point index and upload the table as it is. Cubics (CFF, SVG curves and arcs)
become quadratic splines the cu2qu way, joins left implied, within a unit.

Files are about half of format 1: 1.3-1.4x a TrueType font's glyf (the
whole subset font's size), 2.0-2.9x CFF, 2.6x smaller than the SVG icons.
Opening checks each symbol's first and last point instead of every curve:
0.34 ms rather than 19 ms for 11,172 Hangul syllables. Points decode
without branching on their flags (9.7 ns a point), still 1.2-10x cheaper
than FreeType's outline.

Glyph advances were half their width since outlines are doubled for
FreeType's implied points; they now match hmtx, and the check says so.

0 files changed, 0 insertions, 0 deletions