parseGlyphContours method

List<GlyphContour>? parseGlyphContours(int glyphId)

Parses the contours for glyphId.

Returns null if the glyph ID is out of range or the glyph data is missing. Returns an empty list for whitespace glyphs (e.g. space).

Implementation

List<GlyphContour>? parseGlyphContours(int glyphId) {
  if (glyphId < 0 || glyphId >= _numGlyphs) return null;
  final glyf = _tableOffsets['glyf'];
  if (glyf == null) return null;

  final offset = _glyphOffset(glyphId);
  final nextOffset = _glyphOffset(glyphId + 1);
  if (offset == nextOffset) return []; // empty glyph (e.g. space)

  final base = glyf + offset;
  if (base + 10 > _data.lengthInBytes) return null;

  final numberOfContours = _data.getInt16(base);
  try {
    if (numberOfContours >= 0) {
      return _parseSimpleGlyph(base, numberOfContours);
    } else {
      return _parseCompositeGlyph(base);
    }
  } catch (_) {
    return null; // malformed glyph data – skip gracefully
  }
}