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Diffstat (limited to 'backend/dvi/mdvi-lib/gf.c')
-rw-r--r--backend/dvi/mdvi-lib/gf.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/backend/dvi/mdvi-lib/gf.c b/backend/dvi/mdvi-lib/gf.c
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--- /dev/null
+++ b/backend/dvi/mdvi-lib/gf.c
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+/* gf.c - GF 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.
+ */
+
+/* functions to read GF fonts */
+
+#include <config.h>
+#include <string.h>
+#include "common.h"
+#include "mdvi.h"
+#include "private.h"
+
+/* opcodes */
+
+#define GF_PAINT0 0
+#define GF_PAINT1 64
+#define GF_PAINT2 65
+#define GF_PAINT3 66
+#define GF_BOC 67
+#define GF_BOC1 68
+#define GF_EOC 69
+#define GF_SKIP0 70
+#define GF_SKIP1 71
+#define GF_SKIP2 72
+#define GF_SKIP3 73
+#define GF_NEW_ROW_0 74
+#define GF_NEW_ROW_1 75
+#define GF_NEW_ROW_MAX 238
+#define GF_XXX1 239
+#define GF_XXX2 240
+#define GF_XXX3 241
+#define GF_XXX4 242
+#define GF_YYY 243
+#define GF_NOOP 244
+#define GF_LOC 245
+#define GF_LOC0 246
+#define GF_PRE 247
+#define GF_POST 248
+#define GF_POST_POST 249
+
+#define GF_ID 131
+#define GF_TRAILER 223
+
+#define BLACK 1
+#define WHITE 0
+
+static int gf_load_font __PROTO((DviParams *, DviFont *));
+static int gf_font_get_glyph __PROTO((DviParams *, DviFont *, int));
+
+/* only symbol exported by this file */
+DviFontInfo gf_font_info = {
+ "GF",
+ 0, /* scaling not supported natively */
+ gf_load_font,
+ gf_font_get_glyph,
+ mdvi_shrink_glyph,
+ mdvi_shrink_glyph_grey,
+ NULL, /* free */
+ NULL, /* reset */
+ NULL, /* lookup */
+ kpse_gf_format,
+ NULL
+};
+
+static int gf_read_bitmap(FILE *p, DviFontChar *ch)
+{
+ int op;
+ int min_n, max_n;
+ int min_m, max_m;
+ int paint_switch;
+ int x, y;
+ int bpl;
+ Int32 par;
+ BmUnit *line;
+ BITMAP *map;
+
+ fseek(p, (long)ch->offset, SEEK_SET);
+ op = fuget1(p);
+ if(op == GF_BOC) {
+ /* skip character code */
+ fuget4(p);
+ /* skip pointer */
+ fuget4(p);
+ min_m = fsget4(p);
+ max_m = fsget4(p);
+ min_n = fsget4(p);
+ max_n = fsget4(p);
+ } else if(op == GF_BOC1) {
+ /* skip character code */
+ fuget1(p);
+ min_m = fuget1(p); /* this is max_m - min_m */
+ max_m = fuget1(p);
+ min_n = fuget1(p); /* this is max_n - min_n */
+ max_n = fuget1(p);
+ min_m = max_m - min_m;
+ min_n = max_n - min_n;
+ } else {
+ mdvi_error(_("GF: invalid opcode %d in character %d\n"),
+ op, ch->code);
+ return -1;
+ }
+
+ ch->x = -min_m;
+ ch->y = max_n;
+ ch->width = max_m - min_m + 1;
+ ch->height = max_n - min_n + 1;
+ map = bitmap_alloc(ch->width, ch->height);
+
+ ch->glyph.data = map;
+ ch->glyph.x = ch->x;
+ ch->glyph.y = ch->y;
+ ch->glyph.w = ch->width;
+ ch->glyph.h = ch->height;
+
+#define COLOR(x) ((x) ? "BLACK" : "WHITE")
+
+ paint_switch = WHITE;
+ x = y = 0;
+ line = map->data;
+ bpl = map->stride;
+ DEBUG((DBG_BITMAPS, "(gf) reading character %d\n", ch->code));
+ while((op = fuget1(p)) != GF_EOC) {
+ Int32 n;
+
+ if(feof(p))
+ break;
+ if(op == GF_PAINT0) {
+ DEBUG((DBG_BITMAPS, "(gf) Paint0 %s -> %s\n",
+ COLOR(paint_switch), COLOR(!paint_switch)));
+ paint_switch = !paint_switch;
+ } else if(op <= GF_PAINT3) {
+ if(op < GF_PAINT1)
+ par = op;
+ else
+ par = fugetn(p, op - GF_PAINT1 + 1);
+ if(y >= ch->height || x + par >= ch->width)
+ goto toobig;
+ /* paint everything between columns x and x + par - 1 */
+ DEBUG((DBG_BITMAPS, "(gf) Paint %d %s from (%d,%d)\n",
+ par, COLOR(paint_switch), x, y));
+ if(paint_switch == BLACK)
+ bitmap_paint_bits(line + (x / BITMAP_BITS),
+ x % BITMAP_BITS, par);
+ paint_switch = !paint_switch;
+ x += par;
+ } else if(op >= GF_NEW_ROW_0 && op <= GF_NEW_ROW_MAX) {
+ y++;
+ line = bm_offset(line, bpl);
+ x = op - GF_NEW_ROW_0;
+ paint_switch = BLACK;
+ DEBUG((DBG_BITMAPS, "(gf) new_row_%d\n", x));
+ } else switch(op) {
+ case GF_SKIP0:
+ y++;
+ line = bm_offset(line, bpl);
+ x = 0;
+ paint_switch = WHITE;
+ DEBUG((DBG_BITMAPS, "(gf) skip_0\n"));
+ break;
+ case GF_SKIP1:
+ case GF_SKIP2:
+ case GF_SKIP3:
+ par = fugetn(p, op - GF_SKIP1 + 1);
+ y += par + 1;
+ line = bm_offset(line, (par + 1) * bpl);
+ x = 0;
+ paint_switch = WHITE;
+ DEBUG((DBG_BITMAPS, "(gf) skip_%d\n", op - GF_SKIP1));
+ break;
+ case GF_XXX1:
+ case GF_XXX2:
+ case GF_XXX3:
+ case GF_XXX4: {
+#ifndef NODEBUG
+ char *s;
+
+ s = read_string(p, op - GF_XXX1 + 1, NULL, 0);
+ DEBUG((DBG_SPECIAL, "(gf) Character %d: Special \"%s\"\n",
+ ch->code, s));
+ mdvi_free(s);
+#else
+ n = fugetn(p, op - GF_XXX1 + 1);
+ fseek(p, (long)n, SEEK_CUR);
+#endif
+ break;
+ }
+ case GF_YYY:
+ n = fuget4(p);
+ DEBUG((DBG_SPECIAL, "(gf) Character %d: MF special %u\n",
+ ch->code, n));
+ break;
+ case GF_NOOP:
+ DEBUG((DBG_BITMAPS, "(gf) no_op\n"));
+ break;
+ default:
+ mdvi_error(_("(gf) Character %d: invalid opcode %d\n"),
+ ch->code, op);
+ goto error;
+ }
+ /* chech that we're still inside the bitmap */
+ if(x > ch->width || y > ch->height)
+ goto toobig;
+ DEBUG((DBG_BITMAPS, "(gf) curr_loc @ (%d,%d)\n", x, y));
+ }
+
+ if(op != GF_EOC)
+ goto error;
+ DEBUG((DBG_BITMAPS, "(gf) end of character %d\n", ch->code));
+ return 0;
+
+toobig:
+ mdvi_error(_("(gf) character %d has an incorrect bounding box\n"),
+ ch->code);
+error:
+ bitmap_destroy(map);
+ ch->glyph.data = NULL;
+ return -1;
+}
+
+static int gf_load_font(DviParams *unused, DviFont *font)
+{
+ int i;
+ int n;
+ int loc;
+ int hic;
+ FILE *p;
+ Int32 word;
+ int op;
+ long alpha, beta, z;
+#ifndef NODEBUG
+ char s[256];
+#endif
+
+ p = font->in;
+
+ /* check preamble */
+ loc = fuget1(p); hic = fuget1(p);
+ if(loc != GF_PRE || hic != GF_ID)
+ goto badgf;
+ loc = fuget1(p);
+#ifndef NODEBUG
+ for(i = 0; i < loc; i++)
+ s[i] = fuget1(p);
+ s[i] = 0;
+ DEBUG((DBG_FONTS, "(gf) %s: %s\n", font->fontname, s));
+#else
+ fseek(p, (long)loc, SEEK_CUR);
+#endif
+ /* now read character locators in postamble */
+ if(fseek(p, (long)-1, SEEK_END) == -1)
+ return -1;
+
+ n = 0;
+ while((op = fuget1(p)) == GF_TRAILER) {
+ if(fseek(p, (long)-2, SEEK_CUR) < 0)
+ break;
+ n++;
+ }
+ if(op != GF_ID || n < 4)
+ goto badgf;
+ /* get the pointer to the postamble */
+ fseek(p, (long)-5, SEEK_CUR);
+ op = fuget4(p);
+ /* jump to it */
+ fseek(p, (long)op, SEEK_SET);
+ if(fuget1(p) != GF_POST)
+ goto badgf;
+ /* skip pointer to last EOC */
+ fuget4(p);
+ /* get the design size */
+ font->design = fuget4(p);
+ /* the checksum */
+ word = fuget4(p);
+ if(word && font->checksum && font->checksum != word) {
+ mdvi_warning(_("%s: bad checksum (expected %u, found %u)\n"),
+ font->fontname, font->checksum, word);
+ } else if(!font->checksum)
+ font->checksum = word;
+ /* skip pixels per point ratio */
+ fuget4(p);
+ fuget4(p);
+ font->chars = xnalloc(DviFontChar, 256);
+ for(loc = 0; loc < 256; loc++)
+ font->chars[loc].offset = 0;
+ /* skip glyph "bounding box" */
+ fseek(p, (long)16, SEEK_CUR);
+ loc = 256;
+ hic = -1;
+ TFMPREPARE(font->scale, z, alpha, beta);
+ while((op = fuget1(p)) != GF_POST_POST) {
+ DviFontChar *ch;
+ int cc;
+
+ /* get the character code */
+ cc = fuget1(p);
+ if(cc < loc)
+ loc = cc;
+ if(cc > hic)
+ hic = cc;
+ ch = &font->chars[cc];
+ switch(op) {
+ case GF_LOC:
+ fsget4(p); /* skip dx */
+ fsget4(p); /* skip dy */
+ break;
+ case GF_LOC0:
+ fuget1(p); /* skip dx */
+ /* dy assumed 0 */
+ break;
+ default:
+ mdvi_error(_("%s: junk in postamble\n"), font->fontname);
+ goto error;
+ }
+ ch->code = cc;
+ ch->tfmwidth = fuget4(p);
+ ch->tfmwidth = TFMSCALE(ch->tfmwidth, z, alpha, beta);
+ ch->offset = fuget4(p);
+ if(ch->offset == -1)
+ ch->offset = 0;
+ /* initialize the rest of the glyph information */
+ ch->x = 0;
+ ch->y = 0;
+ ch->width = 0;
+ ch->height = 0;
+ ch->glyph.data = NULL;
+ ch->shrunk.data = NULL;
+ ch->grey.data = NULL;
+ ch->flags = 0;
+ ch->loaded = 0;
+ }
+
+ if(op != GF_POST_POST)
+ goto badgf;
+
+ if(loc > 0 || hic < 255) {
+ /* shrink to optimal size */
+ 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;
+
+ return 0;
+
+badgf:
+ mdvi_error(_("%s: File corrupted, or not a GF file\n"), font->fontname);
+error:
+ if(font->chars) {
+ mdvi_free(font->chars);
+ font->chars = NULL;
+ }
+ font->loc = font->hic = 0;
+ return -1;
+}
+
+static int gf_font_get_glyph(DviParams *params, DviFont *font, int code)
+{
+ DviFontChar *ch;
+
+ if(code < font->loc || code > font->hic || !font->chars)
+ return -1;
+ ch = &font->chars[code - font->loc];
+
+ if(!ch->loaded) {
+ if(ch->offset == 0)
+ return -1;
+ DEBUG((DBG_GLYPHS, "(gf) %s: loading GF glyph for character %d\n",
+ font->fontname, code));
+ if(font->in == NULL && font_reopen(font) < 0)
+ return -1;
+ if(fseek(font->in, ch->offset, SEEK_SET) == -1)
+ return -1;
+ if(gf_read_bitmap(font->in, ch) < 0)
+ return -1;
+ ch->loaded = 1;
+ }
+ return 0;
+}
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