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