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/*
* 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 <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include "mdvi.h"
#include "private.h"
static int tfm_load_font __PROTO((DviParams *, DviFont *));
static int tfm_font_get_glyph __PROTO((DviParams *, DviFont *, int));
DviFontInfo tfm_font_info = {
"TFM",
0, /* scaling not supported by format */
tfm_load_font,
tfm_font_get_glyph,
mdvi_shrink_box,
mdvi_shrink_box,
NULL, /* free */
NULL, /* reset */
NULL, /* lookup */
kpse_tfm_format,
NULL
};
DviFontInfo ofm_font_info = {
"OFM",
0, /* scaling not supported by format */
tfm_load_font,
tfm_font_get_glyph,
mdvi_shrink_box,
mdvi_shrink_box,
NULL, /* free */
NULL, /* reset */
NULL, /* lookup */
kpse_ofm_format,
NULL
};
DviFontInfo afm_font_info = {
"AFM",
0, /* scaling not supported by format */
tfm_load_font,
tfm_font_get_glyph,
mdvi_shrink_box,
mdvi_shrink_box,
NULL, /* free */
NULL, /* reset */
NULL, /* lookup */
kpse_afm_format,
NULL
};
/*
* Although it does not seem that way, this conversion is independent of the
* shrinking factors, within roundoff (that's because `conv' and `vconv'
* have already been scaled by hshrink and vshrink, repsectively). We
* should really use `dviconv' and `dvivconv', but I'm not so sure those
* should be moved to the DviParams structure.
*/
#define XCONV(x) FROUND(params->conv * (x) * params->hshrink)
#define YCONV(y) FROUND(params->vconv * (y) * params->vshrink)
/* this is used quite often in several places, so I made it standalone */
int get_tfm_chars(DviParams *params, DviFont *font, TFMInfo *info, int loaded)
{
Int32 z, alpha, beta;
int n;
DviFontChar *ch;
TFMChar *ptr;
n = info->hic - info->loc + 1;
if(n != FONT_GLYPH_COUNT(font)) {
font->chars = mdvi_realloc(font->chars,
n * sizeof(DviFontChar));
}
font->loc = info->loc;
font->hic = info->hic;
ch = font->chars;
ptr = info->chars;
/* Prepare z, alpha and beta for TFM width computation */
TFMPREPARE(font->scale, z, alpha, beta);
/* get the character metrics */
for(n = info->loc; n <= info->hic; ch++, ptr++, n++) {
int a, b, c, d;
ch->offset = ptr->present;
if(ch->offset == 0)
continue;
/* this is what we came here for */
ch->tfmwidth = TFMSCALE(z, ptr->advance, alpha, beta);
/* scale all other TFM units (so they are in DVI units) */
a = TFMSCALE(z, ptr->left, alpha, beta);
b = TFMSCALE(z, ptr->right, alpha, beta);
c = TFMSCALE(z, ptr->height, alpha, beta);
d = TFMSCALE(z, ptr->depth, alpha, beta);
/* now convert to unscaled pixels */
ch->width = XCONV(b - a);
ch->height = YCONV(c - d);
if(ch->height < 0) ch->height = -ch->height;
ch->x = XCONV(a);
ch->y = YCONV(c);
/*
* the offset is not used, but we might as well set it to
* something meaningful (and it MUST be non-zero)
*/
ch->flags = 0;
ch->code = n;
ch->glyph.data = NULL;
ch->grey.data = NULL;
ch->shrunk.data = NULL;
ch->loaded = loaded;
}
return 0;
}
/*
* We use this function as a last resort to find the character widths in a
* font The DVI rendering code can correctly skip over a glyph if it knows
* its TFM width, which is what we try to find here.
*/
static int tfm_load_font(DviParams *params, DviFont *font)
{
TFMInfo *tfm;
int type;
switch(font->search.info->kpse_type) {
case kpse_tfm_format:
type = DviFontTFM;
break;
case kpse_afm_format:
type = DviFontAFM;
break;
case kpse_ofm_format:
type = DviFontOFM;
break;
default:
return -1;
}
/* we don't need this */
if(font->in) {
fclose(font->in);
font->in = NULL;
}
tfm = get_font_metrics(font->fontname, type, font->filename);
if(tfm == NULL)
return -1;
if(tfm->checksum && font->checksum && tfm->checksum != font->checksum) {
mdvi_warning(_("%s: Checksum mismatch (got %u, expected %u)\n"),
font->fontname, (unsigned)tfm->checksum,
(unsigned)font->checksum);
}
font->checksum = tfm->checksum;
font->design = tfm->design;
font->loc = 0;
font->hic = 0;
font->chars = NULL;
get_tfm_chars(params, font, tfm, 1);
/* free everything */
free_font_metrics(tfm);
return 0;
}
static int tfm_font_get_glyph(DviParams *params, DviFont *font, int code)
{
DviFontChar *ch;
ch = FONTCHAR(font, code);
if(!glyph_present(ch))
return -1;
ch->glyph.x = ch->x;
ch->glyph.y = ch->y;
ch->glyph.w = ch->width;
ch->glyph.h = ch->height;
/*
* This has two purposes: (1) avoid unnecessary calls to this function,
* and (2) detect when the glyph data for a TFM font is actually used
* (we'll get a SEGV). Any occurrence of that is a bug.
*/
ch->glyph.data = MDVI_GLYPH_EMPTY;
return 0;
}
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