Method getGlyph

lib/EpdFont/EpdFont.cpp:157–189

}

const EpdGlyph* EpdFont::getGlyph(const uint32_t cp) const {
  const int count = data->intervalCount;
  if (count == 0 && !data->glyphMissHandler) return nullptr;

  if (count > 0) {
    const EpdUnicodeInterval* intervals = data->intervals;
    const auto* end = intervals + count;

    // upper_bound: range lookup. Finds the first interval with first > cp, so the
    // interval just before it is the last one with first <= cp. That's the only
    // candidate that could contain cp. Then we verify cp <= candidate.last.
    const auto it = std::upper_bound(
        intervals, end, cp, [](uint32_t value, const EpdUnicodeInterval& interval) { return value < interval.first; });

    if (it != intervals) {
      const auto& interval = *(it - 1);
      if (cp <= interval.last) {
        return &data->glyph[interval.offset + (cp - interval.first)];
      }
    }
  }

  // Codepoint not in interval table — try on-demand loading (SD card fonts).
  if (data->glyphMissHandler) {
    const EpdGlyph* loaded = data->glyphMissHandler(data->glyphMissCtx, cp);
    if (loaded) return loaded;
  }

  if (cp != REPLACEMENT_GLYPH) {
    return getGlyph(REPLACEMENT_GLYPH);
  }
  return nullptr;
}