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/* vf.c -- VF font support */
/*
* Copyright (C) 2000, Matias Atria
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <config.h>
#include <string.h>
#include "mdvi.h"
#include "private.h"
static int vf_load_font __PROTO((DviParams *, DviFont *));
static void vf_free_macros __PROTO((DviFont *));
/* only symbol exported by this file */
DviFontInfo vf_font_info = {
"VF",
1, /* virtual fonts scale just fine */
vf_load_font,
NULL, /* get_glyph */
NULL, /* shrink0 */
NULL, /* shrink1 */
vf_free_macros,
NULL, /* reset */
NULL, /* lookup */
kpse_vf_format,
NULL
};
DviFontInfo ovf_font_info = {
"OVF",
1, /* virtual fonts scale just fine */
vf_load_font,
NULL, /* get_glyph */
NULL, /* shrink0 */
NULL, /* shrink1 */
vf_free_macros,
NULL, /* reset */
NULL, /* lookup */
kpse_ovf_format,
NULL
};
static int vf_load_font(DviParams *params, DviFont *font)
{
FILE *p;
Uchar *macros;
int msize;
int mlen;
Int32 checksum;
long alpha, beta, z;
int op;
int i;
int nchars;
int loc, hic;
DviFontRef *last;
macros = NULL;
msize = mlen = 0;
p = font->in;
if(fuget1(p) != 247 || fuget1(p) != 202)
goto badvf;
mlen = fuget1(p);
fseek(p, (long)mlen, SEEK_CUR);
checksum = fuget4(p);
if(checksum && font->checksum && checksum != font->checksum) {
mdvi_warning(_("%s: Checksum mismatch (expected %u, got %u)\n"),
font->fontname, font->checksum, checksum);
} else if(!font->checksum)
font->checksum = checksum;
font->design = fuget4(p);
/* read all the fonts in the preamble */
last = NULL;
/* initialize alpha, beta and z for TFM width computation */
TFMPREPARE(font->scale, z, alpha, beta);
op = fuget1(p);
while(op >= DVI_FNT_DEF1 && op <= DVI_FNT_DEF4) {
DviFontRef *ref;
Int32 scale, design;
Uint32 checksum;
int id;
int n;
int hdpi;
int vdpi;
char *name;
/* process fnt_def commands */
id = fugetn(p, op - DVI_FNT_DEF1 + 1);
checksum = fuget4(p);
scale = fuget4(p);
design = fuget4(p);
/* scale this font according to our parent's scale */
scale = TFMSCALE(scale, z, alpha, beta);
design = FROUND(params->tfm_conv * design);
/* compute the resolution */
hdpi = FROUND(params->mag * params->dpi * scale / design);
vdpi = FROUND(params->mag * params->vdpi * scale / design);
n = fuget1(p) + fuget1(p);
name = mdvi_malloc(n + 1);
fread(name, 1, n, p);
name[n] = 0;
DEBUG((DBG_FONTS, "(vf) %s: defined font `%s' at %.1fpt (%dx%d dpi)\n",
font->fontname, name,
(double)scale / (params->tfm_conv * 0x100000), hdpi, vdpi));
/* get the font */
ref = font_reference(params, id, name, checksum, hdpi, vdpi, scale);
if(ref == NULL) {
mdvi_error(_("(vf) %s: could not load font `%s'\n"),
font->fontname, name);
goto error;
}
mdvi_free(name);
if(last == NULL)
font->subfonts = last = ref;
else
last->next = ref;
ref->next = NULL;
op = fuget1(p);
}
if(op >= DVI_FNT_DEF1 && op <= DVI_FNT_DEF4)
goto error;
/* This function correctly reads both .vf and .ovf files */
font->chars = xnalloc(DviFontChar, 256);
for(i = 0; i < 256; i++)
font->chars[i].offset = 0;
nchars = 256;
loc = -1; hic = -1;
/* now read the characters themselves */
while(op <= 242) {
int pl;
Int32 cc;
Int32 tfm;
if(op == 242) {
pl = fuget4(p);
cc = fuget4(p);
tfm = fuget4(p);
} else {
pl = op;
cc = fuget1(p);
tfm = fuget3(p);
}
if(loc < 0 || cc < loc)
loc = cc;
if(hic < 0 || cc > hic)
hic = cc;
if(cc >= nchars) {
font->chars = xresize(font->chars,
DviFontChar, cc + 16);
for(i = nchars; i < cc + 16; i++)
font->chars[i].offset = 0;
nchars = cc + 16;
}
if(font->chars[cc].offset) {
mdvi_error(_("(vf) %s: character %d redefined\n"),
font->fontname, cc);
goto error;
}
DEBUG((DBG_GLYPHS, "(vf) %s: defined character %d (macro length %d)\n",
font->fontname, cc, pl));
font->chars[cc].width = pl + 1;
font->chars[cc].code = cc;
font->chars[cc].tfmwidth = TFMSCALE(tfm, z, alpha, beta);
font->chars[cc].offset = mlen;
font->chars[cc].loaded = 1;
if(mlen + pl + 1 > msize) {
msize = mlen + pl + 256;
macros = xresize(macros, Uchar, msize);
}
if(pl && fread(macros + mlen, 1, pl, p) != pl)
break;
macros[mlen+pl] = DVI_EOP;
mlen += pl + 1;
op = fuget1(p);
}
if(op != 248) {
mdvi_error(_("(vf) %s: no postamble\n"), font->fontname);
goto error;
}
/* make macro memory just big enough */
if(msize > mlen) {
macros = xresize(macros, Uchar, mlen);
msize = mlen;
}
DEBUG((DBG_FONTS|DBG_GLYPHS,
"(vf) %s: macros use %d bytes\n", font->fontname, msize));
if(loc > 0 || hic < nchars-1) {
memmove(font->chars, font->chars + loc,
(hic - loc + 1) * sizeof(DviFontChar));
font->chars = xresize(font->chars,
DviFontChar, hic - loc + 1);
}
font->loc = loc;
font->hic = hic;
font->private = macros;
return 0;
badvf:
mdvi_error(_("%s: File corrupted, or not a VF file.\n"), font->fontname);
error:
if(font->chars)
mdvi_free(font->chars);
if(macros)
mdvi_free(macros);
return -1;
}
static void vf_free_macros(DviFont *font)
{
mdvi_free(font->private);
}
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