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Diffstat (limited to 'backend/dvi/mdvi-lib/vf.c')
-rw-r--r--backend/dvi/mdvi-lib/vf.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/vf.c b/backend/dvi/mdvi-lib/vf.c
new file mode 100644
index 00000000..fb498476
--- /dev/null
+++ b/backend/dvi/mdvi-lib/vf.c
@@ -0,0 +1,241 @@
+/* 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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