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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
// TeXFont_TFM.cpp
//
// Part of KDVI - A DVI previewer for the KDE desktop environemt
//
// (C) 2003 Stefan Kebekus
// Distributed under the GPL
// Add header files alphabetically
#include <config.h>
#include <kdebug.h>
#include <klocale.h>
#include <tqdatastream.h>
#include <tqfile.h>
#include "glyph.h"
#include "TeXFont_TFM.h"
#include "TeXFontDefinition.h"
//#define DEBUG_TFM
TeXFont_TFM::TeXFont_TFM(TeXFontDefinition *parent)
: TeXFont(parent)
{
#ifdef DEBUG_TFM
kdDebug(4300) << "TeXFont_TFM::TeXFont_TFM( parent=" << parent << " )" << endl;
#endif
TQFile file( parent->filename );
if ( !file.open( IO_ReadOnly ) ) {
kdError(4300) << "TeXFont_TFM::TeXFont_TFM(): Could not read TFM file" << endl;
return;
}
TQDataStream stream( &file );
// Data from the very beginning of the TFM file, as specified in
// "The DVI Driver Standard, Level 0", section D.2.1
TQ_UINT16 lf, lh, bc, ec, nw, nh, nd;
stream >> lf >> lh >> bc >> ec >> nw >> nh >> nd;
#ifdef DEBUG_TFM
kdDebug(4300) << "lf= " << lf << endl
<< "lh= " << lh << endl
<< "bc= " << bc << endl
<< "ec= " << ec << endl
<< "nw= " << nw << endl
<< "nh= " << nh << endl
<< "nd= " << nd << endl;
#endif
if ((bc > ec) || (ec >= TeXFontDefinition::max_num_of_chars_in_font)) {
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid bc and ec entries." << endl;
file.close();
return;
}
// Data from the HEADER section of the TFM data.
file.at(24);
stream >> checksum >> design_size_in_TeX_points.value;
#ifdef DEBUG_TFM
kdDebug(4300) << "checksum = " << checksum << endl
<< "design_size = " << design_size_in_TeX_points.toDouble() << " TeX Points" << endl
<< " = " << design_size_in_TeX_points.toDouble()*254.0/7227.0 << " cm" << endl;
#endif
// Width table
fix_word widthTable_in_units_of_design_size[TeXFontDefinition::max_num_of_chars_in_font];
for(unsigned int i=0; i<TeXFontDefinition::max_num_of_chars_in_font; i++)
widthTable_in_units_of_design_size[i].value = 0;
file.at( 24 + 4*lh + 4*(ec-bc) );
for(unsigned int i=0; i<nw; i++) {
stream >> widthTable_in_units_of_design_size[i].value;
// Some characters, which are used as parts of glyphs, have width
// 0 --the real width is caculated in a lig_kern program and
// depends on the preceding character. We cannot calculate the
// real width here and take 0.4 times the design size as an
// approximation.
if (widthTable_in_units_of_design_size[i].value == 0)
widthTable_in_units_of_design_size[i].fromDouble(0.4);
}
// Height table
fix_word heightTable_in_units_of_design_size[16];
for(unsigned int i=0; i<16; i++)
heightTable_in_units_of_design_size[i].value = 0;
for(unsigned int i=0; i<nh; i++) {
stream >> heightTable_in_units_of_design_size[i].value;
}
// Char-Info table
file.at( 24 + 4*lh );
for(unsigned int characterCode=bc; characterCode<ec; characterCode++) {
glyph *g = glyphtable+characterCode;
TQ_UINT8 byte;
stream >> byte;
if (byte >= nw)
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
else {
characterWidth_in_units_of_design_size[characterCode] = widthTable_in_units_of_design_size[byte];
g->dvi_advance_in_units_of_design_size_by_2e20 = widthTable_in_units_of_design_size[byte].value;
}
stream >> byte;
byte = byte >> 4;
if (byte >= nh)
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
else
characterHeight_in_units_of_design_size[characterCode] = heightTable_in_units_of_design_size[byte];
stream >> byte;
stream >> byte;
}
file.close();
}
TeXFont_TFM::~TeXFont_TFM()
{
}
glyph *TeXFont_TFM::getGlyph(TQ_UINT16 characterCode, bool generateCharacterPixmap, const TQColor& color)
{
#ifdef DEBUG_TFM
kdDebug(4300) << "TeXFont_TFM::getGlyph( ch=" << ch << ", generateCharacterPixmap=" << generateCharacterPixmap << " )" << endl;
#endif
// Paranoia checks
if (characterCode >= TeXFontDefinition::max_num_of_chars_in_font) {
kdError(4300) << "TeXFont_TFM::getGlyph(): Argument is too big." << endl;
return glyphtable;
}
// This is the address of the glyph that will be returned.
struct glyph *g = glyphtable+characterCode;
if ((generateCharacterPixmap == true) && ((g->shrunkenCharacter.isNull()) || (color != g->color)) ) {
g->color = color;
TQ_UINT16 pixelWidth = (TQ_UINT16)(parent->displayResolution_in_dpi *
design_size_in_TeX_points.toDouble() *
characterWidth_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
TQ_UINT16 pixelHeight = (TQ_UINT16)(parent->displayResolution_in_dpi *
design_size_in_TeX_points.toDouble() *
characterHeight_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
// Just make sure that weired TFM files never lead to giant
// pixmaps that eat all system memory...
if (pixelWidth > 50)
pixelWidth = 50;
if (pixelHeight > 50)
pixelHeight = 50;
g->shrunkenCharacter.resize( pixelWidth, pixelHeight );
g->shrunkenCharacter.fill(color);
g->x2 = 0;
g->y2 = pixelHeight;
}
return g;
}
|
