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
+
+namespace PdfSharpCore.Pdf.Advanced
+{
+    /// <summary>
+    /// Represents a PDF group XObject.
+    /// </summary>
+    public abstract class PdfGroupAttributes : PdfDictionary
+    {
+        internal PdfGroupAttributes(PdfDocument thisDocument)
+            : base(thisDocument)
+        {
+            Elements.SetName(Keys.Type, "/Group");
+        }
+
+        /// <summary>
+        /// Predefined keys of this dictionary.
+        /// </summary>
+        public class Keys : KeysBase
+        {
+            /// <summary>
+            ///(Optional) The type of PDF object that this dictionary describes;
+            ///if present, must be Group for a group attributes dictionary.
+            /// </summary>
+            [KeyInfo(KeyType.Name | KeyType.Optional)]
+            public const string Type = "/Type";
+
+            /// <summary>
+            /// (Required) The group subtype, which identifies the type of group whose
+            /// attributes this dictionary describes and determines the format and meaning
+            /// of the dictionary’s remaining entries. The only group subtype defined in
+            /// PDF 1.4 is Transparency. Other group subtypes may be added in the future.
+            /// </summary>
+            [KeyInfo(KeyType.Name | KeyType.Required)]
+            public const string S = "/S";
+
+            /// <summary>
+            /// Gets the KeysMeta for these keys.
+            /// </summary>
+            internal static DictionaryMeta Meta
+            {
+                get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
+            }
+            static DictionaryMeta _meta;
+        }
+
+        /// <summary>
+        /// Gets the KeysMeta of this dictionary type.
+        /// </summary>
+        internal override DictionaryMeta Meta
+        {
+            get { return Keys.Meta; }
+        }
+    }
+}