Method rowPaintIcon

Telegram/SourceFiles/ui/controls/location_picker.cpp:267–341

}

void VenuesController::rowPaintIcon(
		QPainter &p,
		int x,
		int y,
		int size,
		const QString &icon) {
	auto i = _icons.find(icon);
	if (i == end(_icons)) {
		i = _icons.emplace(icon, VenueIcon{
			.document = _session->data().venueIconDocument(icon),
		}).first;
		i->second.media = i->second.document->createMediaView();
		i->second.document->forceToCache(true);
		i->second.document->save({}, QString(), LoadFromCloudOrLocal, true);
	}
	auto &data = i->second;
	const auto version = uint32(style::PaletteVersion());
	const auto loaded = (!data.media || data.media->loaded()) ? 1 : 0;
	const auto prepare = data.image.isNull()
		|| (data.iconLoaded != loaded)
		|| (data.paletteVersion != version);
	if (prepare) {
		const auto skip = st::pickLocationIconSkip;
		const auto inner = size - skip * 2;
		const auto ratio = style::DevicePixelRatio();

		if (loaded && data.media) {
			const auto bytes = base::take(data.media)->bytes();
			data.icon = Images::Read({ .content = bytes }).image;
			if (!data.icon.isNull()) {
				data.icon = data.icon.scaled(
					QSize(inner, inner) * ratio,
					Qt::IgnoreAspectRatio,
					Qt::SmoothTransformation);
				if (!data.icon.isNull()) {
					data.icon = data.icon.convertToFormat(
						QImage::Format_ARGB32_Premultiplied);
				}
			}
		}

		const auto full = QSize(size, size) * ratio;
		auto image = (data.image.size() == full)
			? base::take(data.image)
			: QImage(full, QImage::Format_ARGB32_Premultiplied);
		image.fill(Qt::transparent);
		image.setDevicePixelRatio(ratio);

		const auto bg = EmptyUserpic::UserpicColor(
			EmptyUserpic::ColorIndex(UniqueRowIdFromString(icon)));
		auto p = QPainter(&image);
		auto hq = PainterHighQualityEnabler(p);
		{
			auto gradient = QLinearGradient(0, 0, 0, size);
			gradient.setStops({
				{ 0., bg.color1->c },
				{ 1., bg.color2->c }
			});