231 lines
9.6 KiB
C#
231 lines
9.6 KiB
C#
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#region PDFsharp - A .NET library for processing PDF
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//
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// Authors:
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// Stefan Lange
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//
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// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using PdfSharp.Drawing;
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using PdfSharp.Pdf.Filters;
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using PdfSharp.Fonts.OpenType;
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namespace PdfSharp.Pdf.Advanced
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{
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/// <summary>
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/// Represents a CIDFont dictionary.
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/// </summary>
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internal class PdfCIDFont : PdfFont
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{
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public PdfCIDFont(PdfDocument document)
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: base(document)
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{ }
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public PdfCIDFont(PdfDocument document, PdfFontDescriptor fontDescriptor, XFont font)
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: base(document)
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{
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Elements.SetName(Keys.Type, "/Font");
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Elements.SetName(Keys.Subtype, "/CIDFontType2");
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PdfDictionary cid = new PdfDictionary();
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cid.Elements.SetString("/Ordering", "Identity");
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cid.Elements.SetString("/Registry", "Adobe");
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cid.Elements.SetInteger("/Supplement", 0);
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Elements.SetValue(Keys.CIDSystemInfo, cid);
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FontDescriptor = fontDescriptor;
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// ReSharper disable once DoNotCallOverridableMethodsInConstructor
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Owner._irefTable.Add(fontDescriptor);
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Elements[Keys.FontDescriptor] = fontDescriptor.Reference;
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FontEncoding = font.PdfOptions.FontEncoding;
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}
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public PdfCIDFont(PdfDocument document, PdfFontDescriptor fontDescriptor, byte[] fontData)
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: base(document)
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{
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Elements.SetName(Keys.Type, "/Font");
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Elements.SetName(Keys.Subtype, "/CIDFontType2");
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PdfDictionary cid = new PdfDictionary();
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cid.Elements.SetString("/Ordering", "Identity");
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cid.Elements.SetString("/Registry", "Adobe");
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cid.Elements.SetInteger("/Supplement", 0);
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Elements.SetValue(Keys.CIDSystemInfo, cid);
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FontDescriptor = fontDescriptor;
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// ReSharper disable once DoNotCallOverridableMethodsInConstructor
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Owner._irefTable.Add(fontDescriptor);
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Elements[Keys.FontDescriptor] = fontDescriptor.Reference;
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FontEncoding = PdfFontEncoding.Unicode;
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}
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public string BaseFont
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{
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get { return Elements.GetName(Keys.BaseFont); }
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set { Elements.SetName(Keys.BaseFont, value); }
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}
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/// <summary>
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/// Prepares the object to get saved.
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/// </summary>
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internal override void PrepareForSave()
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{
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base.PrepareForSave();
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#if DEBUG_
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if (FontDescriptor._descriptor.FontFace.loca == null)
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{
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GetType();
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}
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#endif
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// CID fonts must be always embedded. PDFsharp embeds automatically a subset.
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OpenTypeFontface subSet = null;
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if (FontDescriptor._descriptor.FontFace.loca == null)
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subSet = FontDescriptor._descriptor.FontFace;
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else
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subSet = FontDescriptor._descriptor.FontFace.CreateFontSubSet(_cmapInfo.GlyphIndices, true);
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byte[] fontData = subSet.FontSource.Bytes;
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PdfDictionary fontStream = new PdfDictionary(Owner);
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Owner.Internals.AddObject(fontStream);
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FontDescriptor.Elements[PdfFontDescriptor.Keys.FontFile2] = fontStream.Reference;
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fontStream.Elements["/Length1"] = new PdfInteger(fontData.Length);
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if (!Owner.Options.NoCompression)
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{
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fontData = Filtering.FlateDecode.Encode(fontData, _document.Options.FlateEncodeMode);
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fontStream.Elements["/Filter"] = new PdfName("/FlateDecode");
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}
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fontStream.Elements["/Length"] = new PdfInteger(fontData.Length);
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fontStream.CreateStream(fontData);
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}
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/// <summary>
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/// Predefined keys of this dictionary.
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/// </summary>
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public new sealed class Keys : PdfFont.Keys
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{
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/// <summary>
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/// (Required) The type of PDF object that this dictionary describes;
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/// must be Font for a CIDFont dictionary.
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/// </summary>
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[KeyInfo(KeyType.Name | KeyType.Required, FixedValue = "Font")]
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public new const string Type = "/Type";
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/// <summary>
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/// (Required) The type of CIDFont; CIDFontType0 or CIDFontType2.
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/// </summary>
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[KeyInfo(KeyType.Name | KeyType.Required)]
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public new const string Subtype = "/Subtype";
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/// <summary>
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/// (Required) The PostScript name of the CIDFont. For Type 0 CIDFonts, this
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/// is usually the value of the CIDFontName entry in the CIDFont program. For
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/// Type 2 CIDFonts, it is derived the same way as for a simple TrueType font;
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/// In either case, the name can have a subset prefix if appropriate.
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/// </summary>
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[KeyInfo(KeyType.Name | KeyType.Required)]
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public new const string BaseFont = "/BaseFont";
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/// <summary>
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/// (Required) A dictionary containing entries that define the character collection
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/// of the CIDFont.
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/// </summary>
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[KeyInfo(KeyType.Dictionary | KeyType.Required)]
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public const string CIDSystemInfo = "/CIDSystemInfo";
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/// <summary>
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/// (Required; must be an indirect reference) A font descriptor describing the
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/// CIDFont’s default metrics other than its glyph widths.
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/// </summary>
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[KeyInfo(KeyType.Dictionary | KeyType.MustBeIndirect, typeof(PdfFontDescriptor))]
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public new const string FontDescriptor = "/FontDescriptor";
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/// <summary>
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/// (Optional) The default width for glyphs in the CIDFont.
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/// Default value: 1000.
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/// </summary>
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[KeyInfo(KeyType.Integer)]
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public const string DW = "/DW";
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/// <summary>
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/// (Optional) A description of the widths for the glyphs in the CIDFont. The
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/// array’s elements have a variable format that can specify individual widths
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/// for consecutive CIDs or one width for a range of CIDs.
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/// Default value: none (the DW value is used for all glyphs).
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/// </summary>
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[KeyInfo(KeyType.Array, typeof(PdfArray))]
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public const string W = "/W";
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/// <summary>
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/// (Optional; applies only to CIDFonts used for vertical writing) An array of two
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/// numbers specifying the default metrics for vertical writing.
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/// Default value: [880 −1000].
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/// </summary>
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[KeyInfo(KeyType.Array)]
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public const string DW2 = "/DW2";
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/// <summary>
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/// (Optional; applies only to CIDFonts used for vertical writing) A description
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/// of the metrics for vertical writing for the glyphs in the CIDFont.
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/// Default value: none (the DW2 value is used for all glyphs).
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/// </summary>
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[KeyInfo(KeyType.Array, typeof(PdfArray))]
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public const string W2 = "/W2";
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/// <summary>
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/// (Optional; Type 2 CIDFonts only) A specification of the mapping from CIDs
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/// to glyph indices. If the value is a stream, the bytes in the stream contain the
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/// mapping from CIDs to glyph indices: the glyph index for a particular CID
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/// value c is a 2-byte value stored in bytes 2 × c and 2 × c + 1, where the first
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/// byte is the high-order byte. If the value of CIDToGIDMap is a name, it must
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/// be Identity, indicating that the mapping between CIDs and glyph indices is
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/// the identity mapping.
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/// Default value: Identity.
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/// This entry may appear only in a Type 2 CIDFont whose associated True-Type font
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/// program is embedded in the PDF file.
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/// </summary>
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[KeyInfo(KeyType.Dictionary | KeyType.StreamOrName)]
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public const string CIDToGIDMap = "/CIDToGIDMap";
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/// <summary>
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/// Gets the KeysMeta for these keys.
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/// </summary>
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internal static DictionaryMeta Meta
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{
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get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
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}
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static DictionaryMeta _meta;
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}
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/// <summary>
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/// Gets the KeysMeta of this dictionary type.
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/// </summary>
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internal override DictionaryMeta Meta
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{
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get { return Keys.Meta; }
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}
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}
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}
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