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https://github.com/UglyToad/PdfPig.git
synced 2025-04-05 20:55:01 +08:00
add postscript table
This commit is contained in:
Eliot Jones
parent
c0618a303f
commit
8d9960ef98
@ -74,6 +74,20 @@
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var maximumProfile = BasicMaximumProfileTable.Load(data, maxHeaderTable);
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var postScriptTable = default(PostScriptTable);
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if (tables.TryGetValue(TrueTypeHeaderTable.Post, out var postscriptHeaderTable))
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{
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postScriptTable = PostScriptTable.Load(data, table, maximumProfile);
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}
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if (!isPostScript)
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{
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if (!tables.TryGetValue(TrueTypeHeaderTable.Loca, out var indexToLocationHeaderTable))
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{
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throw new InvalidOperationException("The location to index table is required for non-PostScript fonts.");
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}
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}
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return new TrueTypeFont(version, header);
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}
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}
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212
src/UglyToad.Pdf/Fonts/TrueType/Tables/PostScriptTable.cs
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212
src/UglyToad.Pdf/Fonts/TrueType/Tables/PostScriptTable.cs
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@ -0,0 +1,212 @@
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namespace UglyToad.Pdf.Fonts.TrueType.Tables
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{
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using System;
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using System.Text;
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/// <summary>
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/// This table contains information for TrueType fonts on PostScript printers.
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/// This includes data for the FontInfo dictionary and the PostScript glyph names.
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/// </summary>
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internal class PostScriptTable : ITable
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{
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public string Tag => TrueTypeHeaderTable.Post;
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public TrueTypeHeaderTable DirectoryTable { get; }
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/// <summary>
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/// Format 1 contains the 258 standard Mac TrueType font file.<br/>
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/// Format 2 is the Microsoft font format.<br/>
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/// Format 2.5 is a space optimised subset of the standard Mac glyph set.<br/>
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/// Format 3 enables a special font type which provides no PostScript information.<br/>
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/// </summary>
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public decimal FormatType { get; }
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/// <summary>
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/// Angle in counter-clockwise degrees from vertical. 0 for upright text, negative for right-leaning text.
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/// </summary>
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public decimal ItalicAngle { get; }
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/// <summary>
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/// Suggested values for the underline position with negative values below the baseline.
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/// </summary>
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public short UnderlinePosition { get; }
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/// <summary>
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/// Suggested values for the underline thickness.
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/// </summary>
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public short UnderlineThickness { get; }
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/// <summary>
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/// 0 if the font is proportionally spaced, non-zero for monospace or other
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/// non-proportional spacing.
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/// </summary>
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public long IsFixedPitch { get; }
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/// <summary>
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/// Minimum memory usage when the TrueType font is downloaded.
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/// </summary>
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public long MinimumMemoryType42 { get; }
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/// <summary>
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/// Maximum memory usage when the TrueType font is downloaded.
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/// </summary>
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public long MaximumMemoryType42 { get; }
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/// <summary>
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/// Minimum memory usage when the TrueType font is downloaded as a Type 1 font.
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/// </summary>
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public long MinimumMemoryType1 { get; }
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/// <summary>
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/// Maximum memory usage when the TrueType font is downloaded as a Type 1 font.
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/// </summary>
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public long MaximumMemoryType1 { get; }
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public string[] GlyphNames { get; }
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public PostScriptTable(TrueTypeHeaderTable directoryTable, decimal formatType, decimal italicAngle, short underlinePosition, short underlineThickness, long isFixedPitch, long minimumMemoryType42, long maximumMemoryType42, long minimumMemoryType1, long maximumMemoryType1, string[] glyphNames)
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{
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DirectoryTable = directoryTable;
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FormatType = formatType;
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ItalicAngle = italicAngle;
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UnderlinePosition = underlinePosition;
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UnderlineThickness = underlineThickness;
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IsFixedPitch = isFixedPitch;
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MinimumMemoryType42 = minimumMemoryType42;
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MaximumMemoryType42 = maximumMemoryType42;
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MinimumMemoryType1 = minimumMemoryType1;
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MaximumMemoryType1 = maximumMemoryType1;
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GlyphNames = glyphNames ?? throw new ArgumentNullException(nameof(glyphNames));
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}
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public static PostScriptTable Load(TrueTypeDataBytes data, TrueTypeHeaderTable table, BasicMaximumProfileTable maximumProfileTable)
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{
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data.Seek(table.Offset - 1);
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var formatType = data.Read32Fixed();
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var italicAngle = data.Read32Fixed();
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var underlinePosition = data.ReadSignedShort();
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var underlineThickness = data.ReadSignedShort();
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var isFixedPitch = data.ReadUnsignedInt();
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var minMemType42 = data.ReadUnsignedInt();
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var maxMemType42 = data.ReadUnsignedInt();
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var mimMemType1 = data.ReadUnsignedInt();
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var maxMemType1 = data.ReadUnsignedInt();
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var glyphNames = GetGlyphNamesByFormat(data, maximumProfileTable, formatType);
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return new PostScriptTable(table, (decimal)formatType, (decimal)italicAngle,
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underlinePosition, underlineThickness, isFixedPitch,
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minMemType42, maxMemType42, mimMemType1,
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maxMemType1, glyphNames);
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}
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private static string[] GetGlyphNamesByFormat(TrueTypeDataBytes data, BasicMaximumProfileTable maximumProfileTable,
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float formatType)
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{
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string[] glyphNames;
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if (Math.Abs(formatType - 1) < float.Epsilon)
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{
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glyphNames = new string[WindowsGlyphList4.NumberOfMacGlyphs];
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Array.Copy(WindowsGlyphList4.MacGlyphNames, glyphNames, WindowsGlyphList4.NumberOfMacGlyphs);
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}
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else if (Math.Abs(formatType - 2) < float.Epsilon)
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{
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glyphNames = GetFormat2GlyphNames(data);
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}
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else if (Math.Abs(formatType - 2.5) < float.Epsilon)
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{
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var glyphNameIndex = new int[maximumProfileTable?.NumberOfGlyphs ?? 0];
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for (var i = 0; i < glyphNameIndex.Length; i++)
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{
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var offset = data.ReadSignedByte();
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glyphNameIndex[i] = i + 1 + offset;
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}
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glyphNames = new string[glyphNameIndex.Length];
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for (var i = 0; i < glyphNames.Length; i++)
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{
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var name = WindowsGlyphList4.MacGlyphNames[glyphNameIndex[i]];
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if (name != null)
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{
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glyphNames[i] = name;
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}
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}
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}
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else if (Math.Abs(formatType - 3) < float.Epsilon)
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{
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glyphNames = new string[0];
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}
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else
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{
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throw new InvalidOperationException($"Format type {formatType} is not supported for the PostScript table.");
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}
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return glyphNames;
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}
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private static string[] GetFormat2GlyphNames(TrueTypeDataBytes data)
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{
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const int reservedIndexStart = 32768;
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var numberOfGlyphs = data.ReadUnsignedShort();
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var glyphNameIndex = new int[numberOfGlyphs];
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var glyphNames = new string[numberOfGlyphs];
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var maxIndex = int.MinValue;
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for (var i = 0; i < numberOfGlyphs; i++)
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{
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var index = data.ReadUnsignedShort();
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glyphNameIndex[i] = index;
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if (index < reservedIndexStart)
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{
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maxIndex = Math.Max(maxIndex, index);
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}
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}
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var nameArray = default(string[]);
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if (maxIndex >= WindowsGlyphList4.NumberOfMacGlyphs)
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{
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var namesLength = maxIndex - WindowsGlyphList4.NumberOfMacGlyphs + 1;
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nameArray = new string[namesLength];
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for (var i = 0; i < namesLength; i++)
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{
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var numberOfCharacters = data.ReadUnsignedByte();
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nameArray[i] = data.ReadString(numberOfCharacters, Encoding.UTF8);
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}
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}
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for (int i = 0; i < numberOfGlyphs; i++)
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{
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var index = glyphNameIndex[i];
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if (index < WindowsGlyphList4.NumberOfMacGlyphs)
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{
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glyphNames[i] = WindowsGlyphList4.MacGlyphNames[index];
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}
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else if (index >= WindowsGlyphList4.NumberOfMacGlyphs && index < reservedIndexStart)
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{
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if (nameArray == null)
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{
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throw new InvalidOperationException("The name array was null despite the number of glyphs exceeding the maximum Mac Glyphs.");
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}
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glyphNames[i] = nameArray[index - WindowsGlyphList4.NumberOfMacGlyphs];
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}
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else
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{
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glyphNames[i] = ".undefined";
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}
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}
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return glyphNames;
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}
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}
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}
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@ -36,6 +36,14 @@
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return (internalBuffer[0] << 8) + (internalBuffer[1] << 0);
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}
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public int ReadUnsignedByte()
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{
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ReadBuffered(internalBuffer, 1);
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// TODO: the cast from int -> byte -> int here suggest we are treating data incorrectly.
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return internalBuffer[0];
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}
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private void ReadBuffered(byte[] buffer, int length)
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{
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var numberRead = 0;
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@ -69,7 +77,7 @@
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public long ReadUnsignedInt()
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{
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ReadBuffered(internalBuffer, 4);
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return (internalBuffer[0] << 24) + (internalBuffer[1] << 16) + (internalBuffer[2] << 8) + (internalBuffer[3] << 0);
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}
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@ -93,7 +101,7 @@
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{
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// TODO: this returns the wrong value, investigate...
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long secondsSince1904 = ReadLong();
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var date = new DateTime(1904, 1, 1, 0, 0, 0, DateTimeKind.Utc);
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var result = date.AddSeconds(secondsSince1904);
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@ -118,5 +126,12 @@
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return ret;
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}
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public int ReadSignedByte()
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{
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ReadBuffered(internalBuffer, 1);
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var signedByte = internalBuffer[0];
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return signedByte < 127 ? signedByte : signedByte - 256;
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}
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}
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}
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76
src/UglyToad.Pdf/Fonts/TrueType/WindowsGlyphList4.cs
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76
src/UglyToad.Pdf/Fonts/TrueType/WindowsGlyphList4.cs
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@ -0,0 +1,76 @@
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namespace UglyToad.Pdf.Fonts.TrueType
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{
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using System.Collections.Generic;
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internal static class WindowsGlyphList4
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{
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/// <summary>
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/// The number of standard mac glyph names.
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/// </summary>
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public static readonly int NumberOfMacGlyphs = 258;
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/// <summary>
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/// The 258 standard mac glyph names used in 'post' format 1 and 2.
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/// </summary>
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public static readonly string[] MacGlyphNames = {
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".notdef",".null", "nonmarkingreturn", "space", "exclam", "quotedbl",
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"numbersign", "dollar", "percent", "ampersand", "quotesingle",
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"parenleft", "parenright", "asterisk", "plus", "comma", "hyphen",
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"period", "slash", "zero", "one", "two", "three", "four", "five",
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"six", "seven", "eight", "nine", "colon", "semicolon", "less",
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"equal", "greater", "question", "at", "A", "B", "C", "D", "E", "F",
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"G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S",
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"T", "U", "V", "W", "X", "Y", "Z", "bracketleft", "backslash",
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"bracketright", "asciicircum", "underscore", "grave", "a", "b",
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"c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o",
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"p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "braceleft",
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"bar", "braceright", "asciitilde", "Adieresis", "Aring",
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"Ccedilla", "Eacute", "Ntilde", "Odieresis", "Udieresis", "aacute",
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"agrave", "acircumflex", "adieresis", "atilde", "aring",
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"ccedilla", "eacute", "egrave", "ecircumflex", "edieresis",
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"iacute", "igrave", "icircumflex", "idieresis", "ntilde", "oacute",
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"ograve", "ocircumflex", "odieresis", "otilde", "uacute", "ugrave",
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"ucircumflex", "udieresis", "dagger", "degree", "cent", "sterling",
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"section", "bullet", "paragraph", "germandbls", "registered",
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"copyright", "trademark", "acute", "dieresis", "notequal", "AE",
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"Oslash", "infinity", "plusminus", "lessequal", "greaterequal",
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"yen", "mu", "partialdiff", "summation", "product", "pi",
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"integral", "ordfeminine", "ordmasculine", "Omega", "ae", "oslash",
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"questiondown", "exclamdown", "logicalnot", "radical", "florin",
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"approxequal", "Delta", "guillemotleft", "guillemotright",
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"ellipsis", "nonbreakingspace", "Agrave", "Atilde", "Otilde", "OE",
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"oe", "endash", "emdash", "quotedblleft", "quotedblright",
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"quoteleft", "quoteright", "divide", "lozenge", "ydieresis",
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"Ydieresis", "fraction", "currency", "guilsinglleft",
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"guilsinglright", "fi", "fl", "daggerdbl", "periodcentered",
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"quotesinglbase", "quotedblbase", "perthousand", "Acircumflex",
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"Ecircumflex", "Aacute", "Edieresis", "Egrave", "Iacute",
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"Icircumflex", "Idieresis", "Igrave", "Oacute", "Ocircumflex",
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"apple", "Ograve", "Uacute", "Ucircumflex", "Ugrave", "dotlessi",
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"circumflex", "tilde", "macron", "breve", "dotaccent", "ring",
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"cedilla", "hungarumlaut", "ogonek", "caron", "Lslash", "lslash",
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"Scaron", "scaron", "Zcaron", "zcaron", "brokenbar", "Eth", "eth",
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"Yacute", "yacute", "Thorn", "thorn", "minus", "multiply",
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"onesuperior", "twosuperior", "threesuperior", "onehalf",
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"onequarter", "threequarters", "franc", "Gbreve", "gbreve",
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"Idotaccent", "Scedilla", "scedilla", "Cacute", "cacute", "Ccaron",
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"ccaron", "dcroat"
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};
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/// <summary>
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/// The indices of the standard mac glyph names.
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/// </summary>
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public static readonly IReadOnlyDictionary<string, int> MacGlyphNamesIndices;
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static WindowsGlyphList4()
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{
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var indices = new Dictionary<string, int>(NumberOfMacGlyphs);
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for (int i = 0; i < NumberOfMacGlyphs; ++i)
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{
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indices[MacGlyphNames[i]] = i;
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}
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MacGlyphNamesIndices = indices;
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}
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}
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}
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