Prepare support for .pdn

QuickLook.Plugin/QuickLook.Plugin.ImageViewer/AnimatedImage/Providers/PdnProvider.cs

@@ -0,0 +1,104 @@
+// Copyright © 2017-2025 QL-Win Contributors
+//
+// This file is part of QuickLook program.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using QuickLook.Common.Helpers;
+using QuickLook.Common.Plugin;
+using System;
+using System.IO;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Media.Animation;
+using System.Windows.Media.Imaging;
+using System.Xml.Linq;
+
+namespace QuickLook.Plugin.ImageViewer.AnimatedImage.Providers;
+
+internal class PdnProvider : AnimationProvider
+{
+    public PdnProvider(Uri path, MetaProvider meta, ContextObject contextObject) : base(path, meta, contextObject)
+    {
+        Animator = new Int32AnimationUsingKeyFrames();
+        Animator.KeyFrames.Add(new DiscreteInt32KeyFrame(0,
+            KeyTime.FromTimeSpan(TimeSpan.Zero)));
+    }
+
+    public override Task<BitmapSource> GetThumbnail(Size renderSize)
+    {
+        // Skip thumbnail
+        return new Task<BitmapSource>(() => null);
+    }
+
+    public override Task<BitmapSource> GetRenderedFrame(int index)
+    {
+        return new Task<BitmapSource>(() =>
+        {
+            try
+            {
+                using TextReader reader = new StreamReader(Path.LocalPath, Encoding.UTF8);
+                string line = reader.ReadLine();
+
+                if (!line.StartsWith("PDN"))
+                    return null;
+
+                int indexOfStart = line.IndexOf("<");
+                int indexOfEnd = line.LastIndexOf(">");
+
+                if (indexOfStart < 0 || indexOfEnd < 0)
+                    return null;
+
+                string xml = line.Substring(indexOfStart, indexOfEnd - indexOfStart + 1);
+
+                // <pdnImage>
+                //   <custom>
+                //     <thumb png="..." />
+                //   </custom>
+                // </pdnImage>
+                XDocument doc = XDocument.Parse(xml);
+                var pngBase64 = doc.Root
+                    ?.Element("custom")
+                    ?.Element("thumb")
+                    ?.Attribute("png")
+                    ?.Value;
+
+                if (pngBase64 != null)
+                {
+                    byte[] imageBytes = Convert.FromBase64String(pngBase64);
+                    MemoryStream ms = new(imageBytes);
+                    BitmapImage bitmap = new();
+                    bitmap.BeginInit();
+                    bitmap.CacheOption = BitmapCacheOption.OnLoad;
+                    bitmap.StreamSource = ms;
+                    bitmap.EndInit();
+                    bitmap.Freeze();
+                    return bitmap;
+                }
+
+                return null;
+            }
+            catch (Exception e)
+            {
+                ProcessHelper.WriteLog(e.ToString());
+                return null;
+            }
+        });
+    }
+
+    public override void Dispose()
+    {
+    }
+}