Function ItemizeScript

src/gfx_layout_icu.cpp:302–324

* Itemize the string into runs per script, based on the previous created runs. * * Basically, this always returns the same or more runs than given. * * @param buff The string to itemize. * @param length The length of the string. * @param runs_current The current runs. * @return The runs. */

 * @return The runs.
 */
std::vector<ICURun> ItemizeScript(UChar *buff, size_t length, std::vector<ICURun> &runs_current)
{
	std::vector<ICURun> runs;
	icu::ScriptRun script_itemizer(buff, length);

	int cur_pos = 0;
	auto cur_run = runs_current.begin();
	while (true) {
		while (cur_pos < script_itemizer.getScriptEnd() && cur_run != runs_current.end()) {
			int stop_pos = std::min(script_itemizer.getScriptEnd(), cur_run->start + cur_run->length);
			assert(stop_pos - cur_pos > 0);

			runs.emplace_back(cur_pos, stop_pos - cur_pos, cur_run->level, script_itemizer.getScriptCode());

			if (stop_pos == cur_run->start + cur_run->length) cur_run++;
			cur_pos = stop_pos;
		}

		if (!script_itemizer.next()) break;
	}

	return runs;
}

/**
 * Itemize the string into runs per style, based on the previous created runs.