inicial

1 files changed, 395 insertions, 0 deletions

diff --git a/backend/dvi/mdvi-lib/gf.c b/backend/dvi/mdvi-lib/gf.c
new file mode 100644
index 00000000..00607ff6
--- /dev/null
+++ b/backend/dvi/mdvi-lib/gf.c
@@ -0,0 +1,395 @@
+/* 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;
+}