Store format flags as strings

Should avoid problems with flag values larger than JSON's max number limit
See SaschaWillems/vulkan.gpuinfo.org#50

vulkanDeviceInfo.cpp

@@ -4,7 +4,7 @@
 *
 * Device information class
 *
-* Copyright (C) 2016-2022 by Sascha Willems (www.saschawillems.de)
+* Copyright (C) 2016-2024 by Sascha Willems (www.saschawillems.de)
 *
 * This code is free software, you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
@@ -883,9 +883,9 @@ QJsonObject VulkanDeviceInfo::toJson(QString submitter, QString comment)
         QJsonArray jsonFormat;
         jsonFormat.append((QJsonValue(format.format)));
         QJsonObject jsonFormatFeatures;
-        jsonFormatFeatures["linearTilingFeatures"] = int(format.properties.linearTilingFeatures);
-        jsonFormatFeatures["optimalTilingFeatures"] = int(format.properties.optimalTilingFeatures);
-        jsonFormatFeatures["bufferFeatures"] = int(format.properties.bufferFeatures);
+        jsonFormatFeatures["linearTilingFeatures"] = QVariant::fromValue(format.properties.linearTilingFeatures).toString();
+        jsonFormatFeatures["optimalTilingFeatures"] = QVariant::fromValue(format.properties.optimalTilingFeatures).toString();
+        jsonFormatFeatures["bufferFeatures"] = QVariant::fromValue(format.properties.bufferFeatures).toString();
         jsonFormatFeatures["supported"] = format.supported;
         jsonFormat.append(jsonFormatFeatures);
         jsonFormats.append(jsonFormat);