Support .pdn in ThumbnailViewer #1708

Implementation still under adjustment.
2025-09-16 05:12:39 +00:00 · 2025-08-02 02:31:05 +08:00
parent 9fe37520d3
commit 5cedcff912
4 changed files with 113 additions and 104 deletions
--- a/QuickLook.Plugin/QuickLook.Plugin.ThumbnailViewer/Providors/PdnProvider.cs
+++ b/QuickLook.Plugin/QuickLook.Plugin.ThumbnailViewer/Providors/PdnProvider.cs
@@ -0,0 +1,93 @@
+// 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 QuickLook.Plugin.ImageViewer;
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Windows;
+using System.Windows.Media.Imaging;
+using System.Xml.Linq;
+
+namespace QuickLook.Plugin.ThumbnailViewer;
+
+internal class PdnProvider
+{
+    public void Prepare(string path, ContextObject context)
+    {
+        try
+        {
+            using Stream imageData = ViewImage(path);
+            BitmapImage bitmap = imageData.ReadAsBitmapImage();
+            context.SetPreferredSizeFit(new Size(bitmap.PixelWidth, bitmap.PixelHeight), 0.8d);
+        }
+        catch (Exception ex)
+        {
+            Debug.WriteLine($"Error reading thumbnail from {path}: {ex.Message}");
+            context.PreferredSize = new Size { Width = 800, Height = 600 };
+        }
+    }
+
+    public Stream ViewImage(string path)
+    {
+        try
+        {
+            using TextReader reader = new StreamReader(path, 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);
+                return ms;
+            }
+
+            return null;
+        }
+        catch (Exception e)
+        {
+            ProcessHelper.WriteLog(e.ToString());
+            return null;
+        }
+    }
+}