mdw@git.distorted.org.uk Git - sgt/halibut/blob - bk_ps.c

   1 /*
   2  * PostScript backend for Halibut
   3  */
   4
   5 #include <assert.h>
   6 #include "halibut.h"
   7 #include "paper.h"
   8
   9 static void ps_comment(FILE *fp, char const *leader, word *words);
  10 static void ps_string_len(FILE *fp, char const *str, int len);
  11 static void ps_string(FILE *fp, char const *str);
  12
  13 paragraph *ps_config_filename(char *filename)
  14 {
  15     return cmdline_cfg_simple("ps-filename", filename, NULL);
  16 }
  17
  18 void ps_backend(paragraph *sourceform, keywordlist *keywords,
  19                 indexdata *idx, void *vdoc) {
  20     document *doc = (document *)vdoc;
  21     int font_index;
  22     font_encoding *fe;
  23     page_data *page;
  24     int pageno;
  25     FILE *fp;
  26     char *filename;
  27     paragraph *p;
  28     outline_element *oe;
  29     int noe;
  30
  31
  32     IGNORE(keywords);
  33     IGNORE(idx);
  34
  35     filename = dupstr("output.ps");
  36     for (p = sourceform; p; p = p->next) {
  37         if (p->type == para_Config) {
  38             if (!ustricmp(p->keyword, L"ps-filename")) {
  39                 sfree(filename);
  40                 filename = dupstr(adv(p->origkeyword));
  41             }
  42         }
  43     }
  44
  45     fp = fopen(filename, "w");
  46     if (!fp) {
  47         error(err_cantopenw, filename);
  48         return;
  49     }
  50
  51     fprintf(fp, "%%!PS-Adobe-3.0\n");
  52     fprintf(fp, "%%%%Creator: Halibut, %s\n", version);
  53     fprintf(fp, "%%%%DocumentData: Clean7Bit\n");
  54     fprintf(fp, "%%%%LanguageLevel: 1\n");
  55     for (pageno = 0, page = doc->pages; page; page = page->next)
  56         pageno++;
  57     fprintf(fp, "%%%%Pages: %d\n", pageno);
  58     for (p = sourceform; p; p = p->next)
  59         if (p->type == para_Title)
  60             ps_comment(fp, "%%Title: ", p->words);
  61     fprintf(fp, "%%%%DocumentNeededResources:\n");
  62     for (fe = doc->fonts->head; fe; fe = fe->next)
  63         /* XXX This may request the same font multiple times. */
  64         if (!fe->font->info->fp)
  65             fprintf(fp, "%%%%+ font %s\n", fe->font->info->name);
  66     fprintf(fp, "%%%%DocumentSuppliedResources: procset Halibut 0 2\n");
  67     for (fe = doc->fonts->head; fe; fe = fe->next)
  68         /* XXX This may request the same font multiple times. */
  69         if (fe->font->info->fp)
  70             fprintf(fp, "%%%%+ font %s\n", fe->font->info->name);
  71     fprintf(fp, "%%%%EndComments\n");
  72
  73     fprintf(fp, "%%%%BeginProlog\n");
  74     fprintf(fp, "%%%%BeginResource: procset Halibut 0 2\n");
  75     /*
  76      * Supply a prologue function which allows a reasonably
  77      * compressed representation of the text on the pages.
  78      *
  79      * "t" expects two arguments: a y-coordinate, and then an array.
  80      * Elements of the array are processed sequentially as follows:
  81      *
  82      *  - a number is treated as an x-coordinate
  83      *  - an array is treated as a (font, size) pair
  84      *  - a string is shown
  85      *
  86      * "r" takes four arguments, and behaves like "rectfill".
  87      */
  88     fprintf(fp,
  89             "/tdict 4 dict dup begin\n"
  90             "  /arraytype {aload pop scalefont setfont} bind def\n"
  91             "  /realtype {1 index moveto} bind def\n"
  92             "  /integertype /realtype load def\n"
  93             "  /stringtype {show} bind def\n"
  94             "end def\n"
  95             "/t { tdict begin {dup type exec} forall end pop } bind def\n"
  96             "/r { 4 2 roll moveto 1 index 0 rlineto 0 exch rlineto\n"
  97             "     neg 0 rlineto closepath fill } bind def\n");
  98     /*
  99      * pdfmark wrappers
 100      *
 101      * "p" generates a named destination referencing this page.
 102      * "x" generates a link to a named destination.
 103      * "u" generates a link to a URI.
 104      *
 105      * They all do nothing if pdfmark is undefined.
 106      */
 107     fprintf(fp,
 108             "/pdfmark where { pop\n"
 109             "  /p { [ /Dest 3 -1 roll /View [ /XYZ null null null ]\n"
 110             "       /DEST pdfmark } bind def\n"
 111             "  /x { [ /Dest 3 -1 roll /Rect 5 -1 roll /Border [0 0 0 0]\n"
 112             "       /Subtype /Link /ANN pdfmark } bind def\n"
 113             "  /u { 2 dict dup /Subtype /URI put dup /URI 4 -1 roll put\n"
 114             "       [ /Action 3 -1 roll /Rect 5 -1 roll /Border [0 0 0 0]\n"
 115             "       /Subtype /Link /ANN pdfmark } bind def\n"
 116             "} {\n"
 117             "  [/p /x /u] { null cvx def } forall\n"
 118             "} ifelse\n");
 119
 120     fprintf(fp, "%%%%EndResource\n");
 121     fprintf(fp, "%%%%EndProlog\n");
 122
 123     fprintf(fp, "%%%%BeginSetup\n");
 124
 125     /*
 126      * Assign a destination name to each page for pdfmark purposes.
 127      */
 128     pageno = 0;
 129     for (page = doc->pages; page; page = page->next) {
 130         char *buf;
 131         pageno++;
 132         buf = snewn(12, char);
 133         sprintf(buf, "/p%d", pageno);
 134         page->spare = buf;
 135     }
 136
 137     /*
 138      * This is as good a place as any to put version IDs.
 139      */
 140     for (p = sourceform; p; p = p->next)
 141         if (p->type == para_VersionID)
 142             ps_comment(fp, "% ", p->words);
 143
 144     /*
 145      * Request the correct page size.  We might want to bracket this
 146      * with "%%BeginFeature: *PageSize A4" or similar, and "%%EndFeature",
 147      * but that would require us to have a way of getting the name of
 148      * the page size given its dimensions.
 149      */
 150     fprintf(fp, "/setpagedevice where {\n");
 151     fprintf(fp, "  pop 2 dict dup /PageSize [%g %g] put setpagedevice\n",
 152             doc->paper_width / FUNITS_PER_PT,
 153             doc->paper_height / FUNITS_PER_PT);
 154     fprintf(fp, "} if\n");
 155
 156     /* Outline etc, only if pdfmark is supported */
 157     fprintf(fp, "/pdfmark where { pop %% if\n");
 158     fprintf(fp, "  [/PageMode/UseOutlines/DOCVIEW pdfmark\n");
 159     noe = doc->n_outline_elements;
 160     for (oe = doc->outline_elements; noe; oe++, noe--) {
 161         char *title;
 162         int titlelen, count, i;
 163
 164         title = pdf_outline_convert(oe->pdata->outline_title, &titlelen);
 165
 166         count = 0;
 167         for (i = 1; i < noe && oe[i].level > oe->level; i++)
 168             if (oe[i].level == oe->level + 1)
 169                 count++;
 170         if (oe->level > 0) count = -count;
 171
 172         fprintf(fp, "  [/Title");
 173         ps_string_len(fp, title, titlelen);
 174         sfree(title);
 175         fprintf(fp, "/Dest%s/Count %d/OUT pdfmark\n",
 176                 (char *)oe->pdata->first->page->spare, count);
 177     }
 178     fprintf(fp, "} if\n");
 179
 180     for (fe = doc->fonts->head; fe; fe = fe->next) {
 181         /* XXX This may request the same font multiple times. */
 182         if (fe->font->info->fp) {
 183             char buf[512];
 184             size_t len;
 185             fprintf(fp, "%%%%BeginResource: font %s\n", fe->font->info->name);
 186             rewind(fe->font->info->fp);
 187             do {
 188                 len = fread(buf, 1, sizeof(buf), fe->font->info->fp);
 189                 fwrite(buf, 1, len, fp);
 190             } while (len == sizeof(buf));
 191             fprintf(fp, "%%%%EndResource\n");
 192         } else {
 193             fprintf(fp, "%%%%IncludeResource: font %s\n",
 194                     fe->font->info->name);
 195         }
 196     }
 197
 198     /*
 199      * Re-encode the fonts.
 200      */
 201     font_index = 0;
 202     for (fe = doc->fonts->head; fe; fe = fe->next) {
 203         char fname[40];
 204         int i;
 205
 206         sprintf(fname, "f%d", font_index++);
 207         fe->name = dupstr(fname);
 208
 209         fprintf(fp, "/%s findfont dup length dict begin\n",
 210             fe->font->info->name);
 211         fprintf(fp, "{1 index /FID ne {def} {pop pop} ifelse} forall\n");
 212         fprintf(fp, "/Encoding [\n");
 213         for (i = 0; i < 256; i++)
 214             fprintf(fp, "/%s%c", fe->vector[i] ? fe->vector[i] : ".notdef",
 215                     i % 4 == 3 ? '\n' : ' ');
 216         fprintf(fp, "] def\n");
 217         fprintf(fp, "currentdict end\n");
 218         fprintf(fp, "/fontname-%s exch definefont /%s exch def\n\n",
 219                fe->name, fe->name);
 220     }
 221     fprintf(fp, "%%%%EndSetup\n");
 222
 223     /*
 224      * Output the text and graphics.
 225      */
 226     pageno = 0;
 227     for (page = doc->pages; page; page = page->next) {
 228         text_fragment *frag, *frag_end;
 229         rect *r;
 230         xref *xr;
 231         font_encoding *fe;
 232         int fs;
 233
 234         pageno++;
 235         fprintf(fp, "%%%%Page: %d %d\n", pageno, pageno);
 236         fprintf(fp, "save %s p\n", (char *)page->spare);
 237
 238         for (xr = page->first_xref; xr; xr = xr->next) {
 239             fprintf(fp, "[%g %g %g %g]",
 240                     xr->lx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT,
 241                     xr->rx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
 242             if (xr->dest.type == PAGE) {
 243                 fprintf(fp, "%s x\n", (char *)xr->dest.page->spare);
 244             } else {
 245                 ps_string(fp, xr->dest.url);
 246                 fprintf(fp, "u\n");
 247             }
 248         }
 249
 250         for (r = page->first_rect; r; r = r->next) {
 251             fprintf(fp, "%g %g %g %g r\n",
 252                     r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT,
 253                     r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT);
 254         }
 255
 256         frag = page->first_text;
 257         fe = NULL;
 258         fs = -1;
 259         while (frag) {
 260             /*
 261              * Collect all the adjacent text fragments with the
 262              * same y-coordinate.
 263              */
 264             for (frag_end = frag;
 265                  frag_end && frag_end->y == frag->y;
 266                  frag_end = frag_end->next);
 267
 268             fprintf(fp, "%g[", frag->y / FUNITS_PER_PT);
 269
 270             while (frag && frag != frag_end) {
 271
 272                 if (frag->fe != fe || frag->fontsize != fs)
 273                     fprintf(fp, "[%s %d]", frag->fe->name, frag->fontsize);
 274                 fe = frag->fe;
 275                 fs = frag->fontsize;
 276
 277                 fprintf(fp, "%g", frag->x/FUNITS_PER_PT);
 278                 ps_string(fp, frag->text);
 279
 280                 frag = frag->next;
 281             }
 282
 283             fprintf(fp, "]t\n");
 284         }
 285
 286         fprintf(fp, "restore showpage\n");
 287     }
 288
 289     fprintf(fp, "%%%%EOF\n");
 290
 291     fclose(fp);
 292
 293     sfree(filename);
 294 }
 295
 296 static void ps_comment(FILE *fp, char const *leader, word *words)
 297 {
 298     fprintf(fp, "%s", leader);
 299
 300     for (; words; words = words->next) {
 301         char *text;
 302         int type;
 303
 304         switch (words->type) {
 305           case word_HyperLink:
 306           case word_HyperEnd:
 307           case word_UpperXref:
 308           case word_LowerXref:
 309           case word_XrefEnd:
 310           case word_IndexRef:
 311             continue;
 312         }
 313
 314         type = removeattr(words->type);
 315
 316         switch (type) {
 317           case word_Normal:
 318             text = utoa_dup(words->text, CS_ASCII);
 319             break;
 320           case word_WhiteSpace:
 321             text = dupstr(" ");
 322             break;
 323           case word_Quote:
 324             text = dupstr("'");
 325             break;
 326         }
 327
 328         fputs(text, fp);
 329         sfree(text);
 330     }
 331
 332     fprintf(fp, "\n");
 333 }
 334
 335 static void ps_string_len(FILE *fp, char const *str, int len) {
 336     char const *c;
 337     int score = 0;
 338
 339     for (c = str; c < str+len; c++) {
 340         if (*c < ' ' || *c > '~')
 341             score += 2;
 342         else if (*c == '(' || *c == ')' || *c == '\\')
 343             score += 0;
 344         else
 345             score -= 1;
 346     }
 347     if (score > 0) {
 348         fprintf(fp, "<");
 349         for (c = str; c < str+len; c++) {
 350             fprintf(fp, "%02X", 0xFF & (int)*c);
 351         }
 352         fprintf(fp, ">");
 353     } else {
 354         fprintf(fp, "(");
 355         for (c = str; c < str+len; c++) {
 356             if (*c < ' ' || *c > '~') {
 357                 fprintf(fp, "\\%03o", 0xFF & (int)*c);
 358             } else {
 359                 if (*c == '(' || *c == ')' || *c == '\\')
 360                     fputc('\\', fp);
 361                 fputc(*c, fp);
 362             }
 363         }
 364         fprintf(fp, ")");
 365     }
 366 }
 367
 368 static void ps_string(FILE *fp, char const *str) {
 369     ps_string_len(fp, str, strlen(str));
 370 }