Method buildAdvanceTableRange

lib/EpdFont/SdCardFont.cpp:1198–1233

template <typename Iter>
int SdCardFont::buildAdvanceTableRange(Iter begin, Iter end, bool includeSpace, bool includeHyphen, uint8_t styleMask) {
  if (!loaded_) return -1;
  styleMask = resolveStyleMask(styleMask);
  if (styleMask == 0) return 0;

  unsigned long startMs = millis();

  // +2 reserved slots for space and hyphen injected after the main scan.
  static constexpr uint32_t MAX_UNIQUE_CODEPOINTS = 4096;
  uint32_t* codepoints = new (std::nothrow) uint32_t[MAX_UNIQUE_CODEPOINTS + 2];
  if (!codepoints) {
    LOG_ERR("SDCF", "buildAdvanceTable: failed to allocate codepoint buffer (%u bytes)", MAX_UNIQUE_CODEPOINTS * 4);
    return -1;
  }
  uint32_t cpCount = 0;
  bool hitCap = false;

  for (auto it = begin; it != end && !hitCap; ++it) {
    hitCap = collectUniqueCodepoints(asCStr(*it), codepoints, cpCount, MAX_UNIQUE_CODEPOINTS);
  }

  if (includeSpace && std::none_of(codepoints, codepoints + cpCount, [](uint32_t c) { return c == ' '; }))
    codepoints[cpCount++] = ' ';
  if (includeHyphen && std::none_of(codepoints, codepoints + cpCount, [](uint32_t c) { return c == '-'; }))
    codepoints[cpCount++] = '-';

  if (hitCap) {
    LOG_ERR("SDCF", "buildAdvanceTable: unique codepoint cap (%u) hit, layout may be approximate",
            MAX_UNIQUE_CODEPOINTS);
  }
  std::sort(codepoints, codepoints + cpCount);
  int totalMissed = fetchAdvancesForCodepoints(codepoints, cpCount, styleMask);
  delete[] codepoints;
  stats_.prewarmTotalMs = millis() - startMs;
  return totalMissed;
}

int SdCardFont::buildAdvanceTable(const char* utf8Text, uint8_t styleMask) {
  return buildAdvanceTableRange(&utf8Text, &utf8Text + 1, false, false, styleMask);