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/*
* Copyright (c) 1994 Paul Vojta. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <kdebug.h>
#include <klocale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "dvi.h"
#include "dviRenderer.h"
#include "fontpool.h"
#include "xdvi.h"
extern void oops(TQString message);
/***
*** VF font reading routines.
*** Public routine is read_index---because virtual characters are presumed
*** to be short, we read the whole virtual font in at once, instead of
*** faulting in characters as needed.
***/
#define LONG_CHAR 242
/*
* These are parameters which determine whether macros are combined for
* storage allocation purposes. Small macros ( <= VF_PARM_1 bytes) are
* combined into chunks of size VF_PARM_2.
*/
#ifndef VF_PARM_1
#define VF_PARM_1 20
#endif
#ifndef VF_PARM_2
#define VF_PARM_2 256
#endif
/*
* The main routine
*/
void TeXFontDefinition::read_VF_index()
{
#ifdef DEBUG_FONTS
kdDebug(4300) << "font::read_VF_index()" << endl;
#endif
FILE *VF_file = file;
unsigned char cmnd;
unsigned char *avail, *availend; /* available space for macros */
flags |= FONT_VIRTUAL;
set_char_p = &dviRenderer::set_vf_char;
#ifdef DEBUG_FONTS
kdDebug(4300) << "TeXFontDefinition::read_VF_index: reading VF pixel file " << filename << endl;
#endif
// Read preamble.
fseek(VF_file, (long) one(VF_file), 1); /* skip comment */
Q_UINT32 file_checksum = four(VF_file);
if (file_checksum && checksum && file_checksum != checksum)
kdError(4300) << i18n("Checksum mismatch") << "(dvi = " << checksum << "u, vf = " << file_checksum <<
"u)" << i18n(" in font file ") << filename << endl;
(void) four(VF_file); /* skip design size */
// Read the fonts.
first_font = NULL;
while ((cmnd = one(VF_file)) >= FNTDEF1 && cmnd <= FNTDEF4) {
int TeXnumber = num(VF_file, (int) cmnd - FNTDEF1 + 1);
Q_UINT32 checksum = four(VF_file);
Q_UINT32 scale = four(VF_file);
Q_UINT32 design = four(VF_file);
Q_UNUSED(design);
Q_UINT16 len = one(VF_file) + one(VF_file); /* sequence point in the middle */
char *fontname = new char[len + 1];
fread(fontname, sizeof(char), len, VF_file);
fontname[len] = '\0';
#ifdef DEBUG_FONTS
kdDebug(4300) << "Virtual font defines subfont \"" << fontname << "\" scale=" << scale << " design=" << design << endl;
#endif
// According to Knuth's documentation found in the web source code
// of the "vftovp" program (which seems to be the standard
// definition of virtual fonts), the "scale" is a fixed point
// number which describes extra enlargement that the virtual font
// imposes. One obtains the enlargement by dividing 2^20.
double enlargement_factor = double(scale)/(1<<20) * enlargement;
// TeXFontDefinition *newfontp = font_pool->appendx(fontname, checksum, (Q_UINT32)(scaled_size_in_DVI_units*enlargement_factor), enlargement_factor);
TeXFontDefinition *newfontp = font_pool->appendx(fontname, checksum, (Q_UINT32)((double(scale)/(1<<20))*scaled_size_in_DVI_units), enlargement_factor);
// Insert font in dictionary and make sure the dictionary is big
// enough.
if (vf_table.size()-2 <= vf_table.count())
// Not quite optimal. The size of the dictionary should be a
// prime. I don't care.
vf_table.resize(vf_table.size()*2);
vf_table.insert(TeXnumber, newfontp);
if (first_font == NULL)
first_font = newfontp;
}
// Prepare macro array.
macrotable = new macro[max_num_of_chars_in_font];
if (macrotable == 0) {
kdError() << i18n("Could not allocate memory for a macro table.") << endl;
exit(0);
}
// Read macros.
avail = availend = NULL;
for (; cmnd <= LONG_CHAR; cmnd = one(VF_file)) {
macro *m;
int len;
unsigned long cc;
long width;
if (cmnd == LONG_CHAR) { /* long form packet */
len = four(VF_file);
cc = four(VF_file);
width = four(VF_file);
if (cc >= 256) {
kdError() << i18n("Virtual character ") << cc << i18n(" in font ")
<< fontname << i18n(" ignored.") << endl;
fseek(VF_file, (long) len, 1);
continue;
}
} else { /* short form packet */
len = cmnd;
cc = one(VF_file);
width = num(VF_file, 3);
}
m = ¯otable[cc];
m->dvi_advance_in_units_of_design_size_by_2e20 = width;
if (len > 0) {
if (len <= availend - avail) {
m->pos = avail;
avail += len;
} else {
m->free_me = true;
if (len <= VF_PARM_1) {
m->pos = avail = new unsigned char [VF_PARM_2];
availend = avail + VF_PARM_2;
avail += len;
} else
m->pos = new unsigned char[len];
}
fread((char *) m->pos, 1, len, VF_file);
m->end = m->pos + len;
}
}
if (cmnd != POST)
oops(i18n("Wrong command byte found in VF macro list: %1").arg(cmnd));
fclose (VF_file);
file = NULL;
}
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