chore: import upstream snapshot with attribution

src/common/FilePreviewCommon/GcodeThumbnail.cs

@@ -0,0 +1,71 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Drawing;
+using System.IO;
+
+namespace Microsoft.PowerToys.FilePreviewCommon
+{
+    /// <summary>
+    /// Represents a gcode thumbnail.
+    /// </summary>
+    public class GcodeThumbnail
+    {
+        /// <summary>
+        /// Gets the gcode thumbnail image format.
+        /// </summary>
+        public GcodeThumbnailFormat Format { get; }
+
+        /// <summary>
+        /// Gets the gcode thumbnail image data in base64.
+        /// </summary>
+        public string Data { get; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="GcodeThumbnail"/> class.
+        /// </summary>
+        /// <param name="format">The gcode thumbnail image format.</param>
+        /// <param name="data">The gcode thumbnail image data in base64.</param>
+        public GcodeThumbnail(GcodeThumbnailFormat format, string data)
+        {
+            Format = format;
+            Data = data;
+        }
+
+        /// <summary>
+        /// Gets a <see cref="Bitmap"/> representing this thumbnail.
+        /// </summary>
+        /// <returns>A <see cref="Bitmap"/> representing this thumbnail.</returns>
+        public Bitmap? GetBitmap()
+        {
+            switch (Format)
+            {
+                case GcodeThumbnailFormat.JPG:
+                case GcodeThumbnailFormat.PNG:
+                    return BitmapFromBase64String();
+
+                case GcodeThumbnailFormat.QOI:
+                    return BitmapFromQoiBase64String();
+
+                default:
+                    return null;
+            }
+        }
+
+        private Bitmap BitmapFromBase64String()
+        {
+            var bitmapBytes = Convert.FromBase64String(Data);
+
+            return new Bitmap(new MemoryStream(bitmapBytes));
+        }
+
+        private Bitmap BitmapFromQoiBase64String()
+        {
+            var bitmapBytes = Convert.FromBase64String(Data);
+
+            return QoiImage.FromStream(new MemoryStream(bitmapBytes));
+        }
+    }
+}