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Diffstat (limited to 'backend/dvi/mdvi-lib/tfm.c')
-rw-r--r--backend/dvi/mdvi-lib/tfm.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/tfm.c b/backend/dvi/mdvi-lib/tfm.c
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+++ b/backend/dvi/mdvi-lib/tfm.c
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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
+};
+
+#define TYPENAME(font) \
+ ((font)->search.info ? (font)->search.info : "none")
+
+/*
+ * 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;
+}