vendor: import KillerPDF 1.7.5 source (GPL-3.0) as the base for MMD PDF

2026-08-27 06:58:22 +02:00
commit 532485a830
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+#region PDFsharp - A .NET library for processing PDF
+//
+// Authors:
+//   Thomas Hövel
+//
+// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)
+//
+// http://www.PdfSharp.com
+// http://sourceforge.net/projects/pdfsharp
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+// DEALINGS IN THE SOFTWARE.
+#endregion
+
+using System.Collections.Generic;
+using System.IO;
+using PdfSharpCore.Pdf;
+
+namespace PdfSharpCore.Drawing.Internal
+{
+    /// <summary>
+    /// The class that imports images of various formats.
+    /// </summary>
+    internal class ImageImporter
+    {
+        // TODO Make a singleton!
+        /// <summary>
+        /// Gets the image importer.
+        /// </summary>
+        public static ImageImporter GetImageImporter()
+        {
+            return new ImageImporter();
+        }
+
+        private ImageImporter()
+        {
+            _importers.Add(new ImageImporterJpeg());
+            _importers.Add(new ImageImporterBmp());
+            // TODO: Special importer for PDF? Or dealt with at a higher level?
+        }
+
+        /// <summary>
+        /// Imports the image.
+        /// </summary>
+        public ImportedImage ImportImage(Stream stream, PdfDocument document)
+        {
+            StreamReaderHelper helper = new StreamReaderHelper(stream);
+
+            // Try all registered importers to see if any of them can handle the image.
+            foreach (IImageImporter importer in _importers)
+            {
+                helper.Reset();
+                ImportedImage image = importer.ImportImage(helper, document);
+                if (image != null)
+                    return image;
+            }
+            return null;
+        }
+
+        private readonly List<IImageImporter> _importers = new List<IImageImporter>();
+    }
+}