Method SetDisplayText

src/audio_karaoke.cpp:339–404

}

void AudioKaraoke::SetDisplayText() {
	wxMemoryDC dc;
	dc.SetFont(split_font);

	auto get_char_width = [&](std::string_view character) -> int {
		if (auto it = char_widths.find(character); it != char_widths.end())
			return it->second;

		const auto size = dc.GetTextExtent(to_wx(character));
		char_height = std::max(char_height, size.GetHeight());
		char_widths.emplace(character, size.GetWidth());
		return size.GetWidth();
	};

	char_width = get_char_width(" ");

	// Width in pixels of each character in this string
	std::vector<int> str_char_widths;

	spaced_text.clear();
	char_to_byte.clear();
	syl_start_points.clear();
	for (auto const& syl : *kara) {
		// The last (and only the last) syllable needs the width of the final
		// character in the syllable, so we unconditionally add it at the end
		// of this loop, then remove the extra ones here
		if (!char_to_byte.empty())
			char_to_byte.pop_back();

		syl_start_points.push_back(spaced_text.size());

		// Add a space between each syllable to avoid crowding
		spaced_text.emplace_back(wxS(" "));
		str_char_widths.push_back(char_width);
		char_to_byte.push_back(1);

		size_t syl_idx = 1;
		agi::BreakIterator characters;
		characters.set_text(syl.text);
		for (; !characters.done(); characters.next()) {
			// Calculate the width in pixels of this character
			const auto character = characters.current();
			const int width = get_char_width(character);
			char_width = std::max(char_width, width);
			str_char_widths.push_back(width);

			spaced_text.emplace_back(to_wx(character));
			char_to_byte.push_back(syl_idx);
			syl_idx += character.size();
		}

		char_to_byte.push_back(syl_idx);
	}

	// Center each character within the space available to it
	char_x.resize(str_char_widths.size());
	for (size_t i = 0; i < str_char_widths.size(); ++i)
		char_x[i] =  i * char_width + (char_width - str_char_widths[i]) / 2;