Option to set custom interface scales

Telegram/Resources/default_kotato-settings-custom.json

@@ -13,5 +13,6 @@
     // "always_show_scheduled": true,
     // "show_chat_id": true,
     // "net_speed_boost": null,
-    // "show_phone_in_drawer": true
+    // "show_phone_in_drawer": true,
+    // "scales": []
 }

Telegram/SourceFiles/core/kotato_settings.cpp

@@ -223,6 +223,20 @@ bool Manager::readCustomFile() {
 	if (settingsShowDrawerPhoneIt != settings.constEnd() && (*settingsShowDrawerPhoneIt).isBool()) {
 		cSetShowPhoneInDrawer((*settingsShowDrawerPhoneIt).toBool());
 	}
+
+	const auto settingsScalesIt = settings.constFind(qsl("scales"));
+	if (settingsScalesIt != settings.constEnd() && (*settingsScalesIt).isArray()) {
+		const auto settingsScalesArray = (*settingsScalesIt).toArray();
+		ClearCustomScales();
+		for (auto i = settingsScalesArray.constBegin(), e = settingsScalesArray.constEnd(); i != e; ++i) {
+			if (!(*i).isDouble()) {
+				continue;
+			}
+
+			AddCustomScale((*i).toInt());
+		}
+
+	}
 	return true;
 }
 
@@ -257,6 +271,9 @@ void Manager::writeDefaultFile() {
 	settings.insert(qsl("net_speed_boost"), QJsonValue(QJsonValue::Null));
 	settings.insert(qsl("show_phone_in_drawer"), cShowPhoneInDrawer());
 
+	auto settingsScales = QJsonArray();
+	settings.insert(qsl("scales"), settingsScales);
+
 	auto document = QJsonDocument();
 	document.setObject(settings);
 	file.write(document.toJson(QJsonDocument::Indented));

Telegram/SourceFiles/settings.cpp

@@ -222,3 +222,21 @@ int gNetMaxFileQueries = 16;
 int gNetUploadRequestInterval = 500;
 
 bool gShowPhoneInDrawer = true;
+
+ScaleVector gInterfaceScales;
+
+bool HasCustomScales() {
+	return (!gInterfaceScales.empty());
+}
+
+bool AddCustomScale(int scale) {
+	if (gInterfaceScales.size() > 6) {
+		return false;
+	}
+	gInterfaceScales.push_back(style::CheckScale(scale));
+	return true;
+}
+
+void ClearCustomScales() {
+	gInterfaceScales.clear();
+}

Telegram/SourceFiles/settings.h

@@ -195,4 +195,10 @@ DeclareSetting(int, NetUploadSessionsCount);
 DeclareSetting(int, NetMaxFileQueries);
 DeclareSetting(int, NetUploadRequestInterval);
 
-DeclareSetting(bool, ShowPhoneInDrawer);
+DeclareSetting(bool, ShowPhoneInDrawer);
+
+using ScaleVector = std::std::vector<int>;
+DeclareRefSetting(ScaleVector, InterfaceScales);
+bool HasCustomScales();
+bool AddCustomScale(int scale);
+void ClearCustomScales();

Telegram/SourceFiles/settings/settings_main.cpp

@@ -137,7 +137,9 @@ void SetupInterfaceScale(
 		icon ? st::settingsScalePadding : st::settingsBigScalePadding);
 
 	static const auto ScaleValues = [&] {
-		auto values = (cIntRetinaFactor() > 1)
+		auto values = HasCustomScales()
+			? cInterfaceScales()
+			: (cIntRetinaFactor() > 1)
 			? std::vector<int>{ 100, 110, 120, 130, 140, 150 }
 			: std::vector<int>{ 100, 125, 150, 200, 250, 300 };
 		if (cConfigScale() == style::kScaleAuto) {