Method processWrapText

source/rendering/StarTextPainter.cpp:129–228

}

bool TextPainter::processWrapText(StringView text, unsigned* wrapWidth, WrapTextCallback textFunc) {
  String font = m_renderSettings.font, setFont = font;
  m_fontTextureGroup.switchFont(font);
  auto iterator = text.begin(), end = text.end();

  unsigned lines = 0;
  auto lineStartIterator = iterator, splitIterator = end;
  unsigned linePixelWidth = 0, splitPixelWidth = 0;
  size_t commandStart = NPos, commandEnd = NPos;
  bool finished = true;

  auto slice = [](StringView::const_iterator a, StringView::const_iterator b) -> StringView {
    return StringView(&*a.base(), b.base() - a.base());
  };

  while (iterator != end) {
    auto character = *iterator;
    finished = false; // assume at least one character if we get here
    bool noMoreCommands = commandStart != NPos && commandEnd == NPos;
    if (!noMoreCommands && Text::isEscapeCode(character)) {
      size_t index = &*iterator.base() - text.utf8Ptr();
      if (commandStart == NPos) {
        for (size_t escOrEnd = commandStart = index;
        (escOrEnd = text.utf8().find_first_of(Text::AllEscEnd, escOrEnd + 1)) != NPos;) {
          if (text.utf8().at(escOrEnd) != Text::EndEsc)
            commandStart = escOrEnd;
          else {
            commandEnd = escOrEnd;
            break;
          }
        }
      }
      if (commandStart == index && commandEnd != NPos) {
        const char* commandStr = text.utf8Ptr() + ++commandStart;
        StringView inner(commandStr, commandEnd - commandStart);
        inner.forEachSplitView(",", [&](StringView command, size_t, size_t) {
          if (command == "reset") {
            m_fontTextureGroup.switchFont(font = setFont);
          } else if (command == "set") {
            setFont = font;
          } else if (command.beginsWith("font=")) {
            m_fontTextureGroup.switchFont(font = command.substr(5));
          }
        });
        // jump the iterator to the character after the command
        iterator = text.utf8().begin() + commandEnd + 1;
        commandStart = commandEnd = NPos;
        continue;
      }
    }
    // is this a linefeed / cr / whatever that forces a line split ?
    if (character == '\n' || character == '\v') {
      // knock one off the end because we don't render the CR
      if (!textFunc(slice(lineStartIterator, iterator), lines++))
        return false;

      lineStartIterator = iterator;
      ++lineStartIterator;