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