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.Diagnostics;
+using System.Globalization;
+using PdfSharpCore.Fonts;
+using PdfSharpCore.Fonts.OpenType;
+
+namespace PdfSharpCore.Drawing
+{
+    /// <summary>
+    /// The bytes of a font file.
+    /// </summary>
+    [DebuggerDisplay("{DebuggerDisplay}")]
+    internal class XFontSource
+    {
+        // Implementation Notes
+        // 
+        // * XFontSource represents a single font (file) in memory.
+        // * An XFontSource hold a reference to it OpenTypeFontface.
+        // * To prevent large heap fragmentation this class must exists only once.
+        // * TODO: ttcf
+
+        // Signature of a true type collection font.
+        const uint ttcf = 0x66637474;
+
+        XFontSource(byte[] bytes, ulong key)
+        {
+            _fontName = null;
+            _bytes = bytes;
+            _key = key;
+        }
+
+        /// <summary>
+        /// Gets an existing font source or creates a new one.
+        /// A new font source is cached in font factory.
+        /// </summary>
+        public static XFontSource GetOrCreateFrom(byte[] bytes)
+        {
+            ulong key = FontHelper.CalcChecksum(bytes);
+            XFontSource fontSource;
+            if (!FontFactory.TryGetFontSourceByKey(key, out fontSource))
+            {
+                fontSource = new XFontSource(bytes, key);
+                // Theoretically the font source could be created by a differend thread in the meantime.
+                fontSource = FontFactory.CacheFontSource(fontSource);
+            }
+            return fontSource;
+        }
+        public static XFontSource GetOrCreateFrom(string typefaceKey, byte[] fontBytes)
+        {
+            XFontSource fontSource;
+            ulong key = FontHelper.CalcChecksum(fontBytes);
+            if (FontFactory.TryGetFontSourceByKey(key, out fontSource))
+            {
+                // The font source already exists, but is not yet cached under the specified typeface key.
+                FontFactory.CacheExistingFontSourceWithNewTypefaceKey(typefaceKey, fontSource);
+            }
+            else
+            {
+                // No font source exists. Create new one and cache it.
+                fontSource = new XFontSource(fontBytes, key);
+                FontFactory.CacheNewFontSource(typefaceKey, fontSource);
+            }
+            return fontSource;
+        }
+
+        public static XFontSource CreateCompiledFont(byte[] bytes)
+        {
+            XFontSource fontSource = new XFontSource(bytes, 0);
+            return fontSource;
+        }
+
+        /// <summary>
+        /// Gets or sets the fontface.
+        /// </summary>
+        internal OpenTypeFontface Fontface
+        {
+            get { return _fontface; }
+            set
+            {
+                _fontface = value;
+                _fontName = value.name.FullFontName;
+            }
+        }
+        OpenTypeFontface _fontface;
+
+        /// <summary>
+        /// Gets the key that uniquely identifies this font source.
+        /// </summary>
+        internal ulong Key
+        {
+            get
+            {
+                if (_key == 0)
+                    _key = FontHelper.CalcChecksum(Bytes);
+                return _key;
+            }
+        }
+        ulong _key;
+
+        public void IncrementKey()
+        {
+            // HACK: Depends on implementation of CalcChecksum.
+            // Increment check sum and keep length untouched.
+            _key += 1ul << 32;
+        }
+
+        /// <summary>
+        /// Gets the name of the font's name table.
+        /// </summary>
+        public string FontName
+        {
+            get { return _fontName; }
+        }
+        string _fontName;
+
+        /// <summary>
+        /// Gets the bytes of the font.
+        /// </summary>
+        public byte[] Bytes
+        {
+            get { return _bytes; }
+        }
+        readonly byte[] _bytes;
+
+        public override int GetHashCode()
+        {
+            return (int)((Key >> 32) ^ Key);
+        }
+
+        public override bool Equals(object obj)
+        {
+            XFontSource fontSource = obj as XFontSource;
+            if (fontSource == null)
+                return false;
+            return Key == fontSource.Key;
+        }
+
+        /// <summary>
+        /// Gets the DebuggerDisplayAttribute text.
+        /// </summary>
+        // ReSha rper disable UnusedMember.Local
+        internal string DebuggerDisplay
+        // ReShar per restore UnusedMember.Local
+        {
+            // The key is converted to a value a human can remember during debugging.
+            get { return String.Format(CultureInfo.InvariantCulture, "XFontSource: '{0}', keyhash={1}", FontName, Key % 99991 /* largest prime number less than 100000 */); }
+        }
+    }
+}