diff options
Diffstat (limited to 'dvi/mdvi-lib/gf.c')
| -rw-r--r-- | dvi/mdvi-lib/gf.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/dvi/mdvi-lib/gf.c b/dvi/mdvi-lib/gf.c new file mode 100644 index 0000000..459e428 --- /dev/null +++ b/dvi/mdvi-lib/gf.c @@ -0,0 +1,394 @@ +/* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* functions to read GF fonts */ + +#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 { + 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)); + xfree(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: + 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: + 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) { + 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: + 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: + error(_("%s: File corrupted, or not a GF file\n"), font->fontname); +error: + if(font->chars) { + xfree(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; +} |