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 transparency group XObject.
+    /// </summary>
+    public sealed class PdfTransparencyGroupAttributes : PdfGroupAttributes
+    {
+        internal PdfTransparencyGroupAttributes(PdfDocument thisDocument)
+            : base(thisDocument)
+        {
+            Elements.SetName(Keys.S, "/Transparency");
+        }
+
+        /// <summary>
+        /// Predefined keys of this dictionary.
+        /// </summary>
+        public sealed new class Keys : PdfGroupAttributes.Keys
+        {
+            /// <summary>
+            /// (Sometimes required, as discussed below)
+            /// The group color space, which is used for the following purposes:
+            /// • As the color space into which colors are converted when painted into the group
+            /// • As the blending color space in which objects are composited within the group
+            /// • As the color space of the group as a whole when it in turn is painted as an object onto its backdrop
+            /// The group color space may be any device or CIE-based color space that
+            /// treats its components as independent additive or subtractive values in the
+            /// range 0.0 to 1.0, subject to the restrictions described in Section 7.2.3, “Blending Color Space.”
+            /// These restrictions exclude Lab and lightness-chromaticity ICCBased color spaces,
+            /// as well as the special color spaces Pattern, Indexed, Separation, and DeviceN.
+            /// Device color spaces are subject to remapping according to the DefaultGray,
+            /// DefaultRGB, and DefaultCMYK entries in the ColorSpace subdictionary of the
+            /// current resource dictionary.
+            /// Ordinarily, the CS entry is allowed only for isolated transparency groups
+            /// (those for which I, below, is true), and even then it is optional. However,
+            /// this entry is required in the group attributes dictionary for any transparency
+            /// group XObject that has no parent group or page from which to inherit — in
+            /// particular, one that is the value of the G entry in a soft-mask dictionary of
+            /// subtype Luminosity.
+            /// In addition, it is always permissible to specify CS in the group attributes
+            /// dictionary associated with a page object, even if I is false or absent. In the
+            /// normal case in which the page is imposed directly on the output medium,
+            /// the page group is effectively isolated regardless of the I value, and the 
+            /// specified CS value is therefore honored. But if the page is in turn used as an
+            /// element of some other page and if the group is non-isolated, CS is ignored
+            /// and the color space is inherited from the actual backdrop with which the
+            /// page is composited.
+            /// Default value: the color space of the parent group or page into which this
+            /// transparency group is painted. (The parent’s color space in turn can be
+            /// either explicitly specified or inherited.)
+            /// </summary>
+            [KeyInfo(KeyType.NameOrArray | KeyType.Optional)]
+            public const string CS = "/CS";
+
+            /// <summary>
+            /// (Optional) A flag specifying whether the transparency group is isolated.
+            /// If this flag is true, objects within the group are composited against a fully
+            /// transparent initial backdrop; if false, they are composited against the
+            /// group’s backdrop.
+            /// Default value: false.
+            /// In the group attributes dictionary for a page, the interpretation of this
+            /// entry is slightly altered. In the normal case in which the page is imposed
+            /// directly on the output medium, the page group is effectively isolated and
+            /// the specified I value is ignored. But if the page is in turn used as an
+            /// element of some other page, it is treated as if it were a transparency
+            /// group XObject; the I value is interpreted in the normal way to determine
+            /// whether the page group is isolated.
+            /// </summary>
+            [KeyInfo(KeyType.Boolean | KeyType.Optional)]
+            public const string I = "/I";
+
+            /// <summary>
+            /// (Optional) A flag specifying whether the transparency group is a knockout
+            /// group. If this flag is false, later objects within the group are composited
+            /// with earlier ones with which they overlap; if true, they are composited with
+            /// the group’s initial backdrop and overwrite (“knock out”) any earlier
+            /// overlapping objects.
+            /// Default value: false.
+            /// </summary>
+            [KeyInfo(KeyType.Boolean | KeyType.Optional)]
+            public const string K = "/K";
+
+            /// <summary>
+            /// Gets the KeysMeta for these keys.
+            /// </summary>
+            internal static new 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; }
+        }
+    }
+}