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.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;
+using System.ComponentModel;
+using System.Threading;
+using PdfSharpCore.Pdf.Internal;
+
+namespace PdfSharpCore.Internal
+{
+    /// <summary>
+    /// Static locking functions to make PDFsharp thread save.
+    /// </summary>
+    internal static class Lock
+    {
+        public static void EnterGdiPlus()
+        {
+            //if (_fontFactoryLockCount > 0)
+            //    throw new InvalidOperationException("");
+
+            Monitor.Enter(GdiPlus);
+            _gdiPlusLockCount++;
+        }
+
+        public static void ExitGdiPlus()
+        {
+            _gdiPlusLockCount--;
+            Monitor.Exit(GdiPlus);
+        }
+
+        static readonly object GdiPlus = new object();
+        static int _gdiPlusLockCount;
+
+        public static void EnterFontFactory()
+        {
+            Monitor.Enter(FontFactory);
+            _fontFactoryLockCount++;
+        }
+
+        public static void ExitFontFactory()
+        {
+            _fontFactoryLockCount--;
+            Monitor.Exit(FontFactory);
+        }
+        static readonly object FontFactory = new object();
+        [ThreadStatic]
+        static int _fontFactoryLockCount;
+    }
+}