Method Shape

src/platform/web/NativeTextShaper.cpp:97–133

}

std::vector<ShapedGlyph> NativeTextShaper::Shape(const std::string& text,
                                                 std::shared_ptr<tgfx::Typeface> typeface) {
  std::vector<Info> infos = {};
  auto textStart = text.data();
  auto textStop = textStart + text.size();
  while (textStart < textStop) {
    auto cluster = static_cast<uint32_t>(textStart - text.data());
    infos.emplace_back(Info{tgfx::UTF::NextUTF8(&textStart, textStop), cluster});
  }

  CheckContinuations(infos);
  MergeClusters(infos);

  std::vector<ShapedGlyph> glyphs = {};
  auto fallbackTypefaces = FontManager::GetFallbackTypefaces();
  for (size_t i = 0; i < infos.size(); ++i) {
    auto length = (i + 1 == infos.size() ? text.length() : infos[i + 1].cluster) - infos[i].cluster;
    if (length == 0) {
      continue;
    }
    auto str = text.substr(infos[i].cluster, length);
    auto glyphID = typeface ? typeface->getGlyphID(str) : 0;
    if (glyphID == 0) {
      for (const auto& faceHolder : fallbackTypefaces) {
        auto face = faceHolder->getTypeface();
        glyphID = face->getGlyphID(str);
        if (glyphID != 0) {
          glyphs.emplace_back(std::move(face), glyphID, infos[i].cluster);
          break;
        }
      }
    } else {
      glyphs.emplace_back(typeface, typeface->getGlyphID(str), infos[i].cluster);
    }
  }
  return glyphs;
}
}  // namespace pag