1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
#region PDFsharp - A .NET library for processing PDF
//
// Authors:
// Stefan Lange (mailto:Stefan.Lange@pdfsharp.com)
//
// Copyright (c) 2005-2008 empira Software GmbH, Cologne (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.Runtime.InteropServices;
using PdfSharp.Drawing;
using PdfSharp.Internal;
using Fixed = System.Int32;
using FWord = System.Int16;
using UFWord = System.UInt16;
namespace PdfSharp.Fonts.TrueType
{
/// <summary>
/// Base class for all TrueType fonts.
/// </summary>
internal class TrueTypeFontTable : ICloneable
{
///// <summary>
///// Initializes a new instance of the <see cref="TrueTypeFontTable"/> class.
///// </summary>
//public TrueTypeFontTable(FontData fontData)
//{
// this.fontData = fontData;
//}
public TrueTypeFontTable(FontData fontData, string tag)
{
this.fontData = fontData;
if (fontData != null && fontData.tableDictionary.ContainsKey(tag))
this.DirectoryEntry = fontData.tableDictionary[tag];
else
this.DirectoryEntry = new TableDirectoryEntry(tag);
this.DirectoryEntry.FontTable = this;
}
/// <summary>
/// Creates a deep copy of the current instance.
/// </summary>
public object Clone()
{
return DeepCopy();
}
protected virtual TrueTypeFontTable DeepCopy()
{
TrueTypeFontTable fontTable = (TrueTypeFontTable)MemberwiseClone();
fontTable.DirectoryEntry.Offset = 0;
fontTable.DirectoryEntry.FontTable = fontTable;
return fontTable;
}
/// <summary>
/// Gets the font image the table belongs to.
/// </summary>
public FontData FontData
{
get { return this.fontData; }
}
internal FontData fontData;
public TableDirectoryEntry DirectoryEntry;
/// <summary>
/// When overridden in a derived class, prepares the font table to be compiled into its binary representation.
/// </summary>
public virtual void PrepareForCompilation()
{
}
/// <summary>
/// When overridden in a derived class, converts the font into its binary representation.
/// </summary>
public virtual void Write(TrueTypeFontWriter writer)
{
}
/// <summary>
/// Calculates the checksum of a table represented by its bytes.
/// </summary>
public static uint CalcChecksum(byte[] bytes)
{
Debug.Assert((bytes.Length & 3) == 0);
// Cannot use Buffer.BlockCopy because 32-bit values are Big-endian
uint byte3, byte2, byte1, byte0;
byte3 = byte2 = byte1 = byte0 = 0;
int length = bytes.Length;
for (int idx = 0; idx < length;)
{
byte3 += bytes[idx++];
byte2 += bytes[idx++];
byte1 += bytes[idx++];
byte0 += bytes[idx++];
}
return (byte3 << 24) + (byte2 << 16) + (byte1 << 8) + byte0;
}
}
}
|
