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:
+//   Stefan Lange
+//
+// Copyright (c) 2005-2016 empira Software GmbH, Cologne Area (Germany)
+//
+// http://www.PdfSharpCore.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;
+using System.Diagnostics;
+using System.Collections.Generic;
+using System.Globalization;
+using PdfSharpCore.Drawing;
+
+namespace PdfSharpCore.Pdf.Advanced
+{
+    /// <summary>
+    /// Contains all used images of a document.
+    /// </summary>
+    internal sealed class PdfImageTable : PdfResourceTable
+    {
+        /// <summary>
+        /// Initializes a new instance of this class, which is a singleton for each document.
+        /// </summary>
+        public PdfImageTable(PdfDocument document)
+            : base(document)
+        { }
+
+        /// <summary>
+        /// Gets a PdfImage from an XImage. If no PdfImage already exists, a new one is created.
+        /// </summary>
+        public PdfImage GetImage(XImage image)
+        {
+            ImageSelector selector = image._selector;
+            if (selector == null)
+            {
+                selector = new ImageSelector(image);
+                image._selector = selector;
+            }
+            if (!_images.TryGetValue(selector, out PdfImage pdfImage))
+            {
+                pdfImage = new PdfImage(Owner, image);
+                //pdfImage.Document = _document;
+                Debug.Assert(pdfImage.Owner == Owner);
+                _images[selector] = pdfImage;
+            }
+            return pdfImage;
+        }
+
+        /// <summary>
+        /// Map from ImageSelector to PdfImage.
+        /// </summary>
+        readonly Dictionary<ImageSelector, PdfImage> _images = new Dictionary<ImageSelector, PdfImage>();
+
+        /// <summary>
+        /// A collection of information that uniquely identifies a particular PdfImage.
+        /// </summary>
+        public class ImageSelector
+        {
+            /// <summary>
+            /// Initializes a new instance of ImageSelector from an XImage.
+            /// </summary>
+            public ImageSelector(XImage image)
+            {
+                // HACK: implement a way to identify images when they are reused
+                // TODO 4STLA Implementation that calculates MD5 hashes for images generated for the images can be found here: http://forum.PdfSharpCore.net/viewtopic.php?p=6959#p6959
+                if (image._path == null)
+                    image._path = "*" + Guid.NewGuid().ToString("B");
+
+                // HACK: just use full path to identify
+                _path = image._path.ToLowerInvariant();
+            }
+
+            public string Path
+            {
+                get { return _path; }
+                set { _path = value; }
+            }
+            string _path;
+
+            public override bool Equals(object obj)
+            {
+                ImageSelector selector = obj as ImageSelector;
+                if (selector == null)
+                    return false;
+                return _path == selector._path;
+            }
+
+            public override int GetHashCode()
+            {
+                return _path.GetHashCode();
+            }
+        }
+    }
+}