Method chooseQuality

Telegram/SourceFiles/data/data_document.cpp:679–709

}

not_null<DocumentData*> DocumentData::chooseQuality(
		HistoryItem *context,
		Media::VideoQuality request) {
	const auto &list = resolveQualities(context);
	if (list.empty() || !request.height) {
		return this;
	}
	const auto height = int(request.height);
	if (request.original) {
		return this;
	}

	auto closest = (DocumentData*)nullptr;
	auto closestAbs = -1;
	auto closestSize = -1;

	for (const auto &quality : list) {
		const auto qres = quality->resolveVideoQuality();
		const auto abs = std::abs(height - qres);
		if (!closest
			|| abs < closestAbs
			|| (abs == closestAbs && (quality->size < closestSize
				|| (closest == this && quality != this)))) {
			closest = quality;
			closestAbs = abs;
			closestSize = quality->size;
		}
	}

	return closest ? closest : this;
}

void DocumentData::validateLottieSticker() {
	if (type == FileDocument