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
  11 paragraph *ps_config_filename(char *filename)
  12 {
  13     return cmdline_cfg_simple("ps-filename", filename, NULL);
  14 }
  15
  16 void ps_backend(paragraph *sourceform, keywordlist *keywords,
  17                 indexdata *idx, void *vdoc) {
  18     document *doc = (document *)vdoc;
  19     int font_index;
  20     font_encoding *fe;
  21     page_data *page;
  22     int pageno;
  23     FILE *fp;
  24     char *filename;
  25     paragraph *p;
  26
  27     IGNORE(keywords);
  28     IGNORE(idx);
  29
  30     filename = dupstr("output.ps");
  31     for (p = sourceform; p; p = p->next) {
  32         if (p->type == para_Config) {
  33             if (!ustricmp(p->keyword, L"ps-filename")) {
  34                 sfree(filename);
  35                 filename = dupstr(adv(p->origkeyword));
  36             }
  37         }
  38     }
  39
  40     fp = fopen(filename, "w");
  41     if (!fp) {
  42         error(err_cantopenw, filename);
  43         return;
  44     }
  45
  46     fprintf(fp, "%%!PS-Adobe-3.0\n");
  47     fprintf(fp, "%%%%Creator: Halibut, %s\n", version);
  48     fprintf(fp, "%%%%DocumentData: Clean8Bit\n");
  49     fprintf(fp, "%%%%LanguageLevel: 1\n");
  50     for (pageno = 0, page = doc->pages; page; page = page->next)
  51         pageno++;
  52     fprintf(fp, "%%%%Pages: %d\n", pageno);
  53     for (p = sourceform; p; p = p->next)
  54         if (p->type == para_Title)
  55             ps_comment(fp, "%%Title: ", p->words);
  56     fprintf(fp, "%%%%DocumentNeededResources:\n");
  57     for (fe = doc->fonts->head; fe; fe = fe->next)
  58         /* XXX This may request the same font multiple times. */
  59         if (!fe->font->info->fp)
  60             fprintf(fp, "%%%%+ font %s\n", fe->font->info->name);
  61     fprintf(fp, "%%%%DocumentSuppliedResources: procset Halibut 0 0\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, "%%%%EndComments\n");
  67
  68     fprintf(fp, "%%%%BeginProlog\n");
  69     fprintf(fp, "%%%%BeginResource: procset Halibut 0 0\n");
  70     /*
  71      * Supply a prologue function which allows a reasonably
  72      * compressed representation of the text on the pages.
  73      *
  74      * Expects two arguments: a y-coordinate, and then an array.
  75      * Elements of the array are processed sequentially as follows:
  76      *
  77      *  - a number is treated as an x-coordinate
  78      *  - an array is treated as a (font, size) pair
  79      *  - a string is shown
  80      */
  81     fprintf(fp,
  82             "/tdict 4 dict dup begin\n"
  83             "  /arraytype {aload pop scalefont setfont} bind def\n"
  84             "  /realtype {1 index moveto} bind def\n"
  85             "  /integertype /realtype load def\n"
  86             "  /stringtype {show} bind def\n"
  87             "end def\n"
  88             "/t { tdict begin {dup type exec} forall end pop } bind def\n");
  89
  90     fprintf(fp, "%%%%EndResource\n");
  91     fprintf(fp, "%%%%EndProlog\n");
  92
  93     fprintf(fp, "%%%%BeginSetup\n");
  94
  95     /*
  96      * This is as good a place as any to put version IDs.
  97      */
  98     for (p = sourceform; p; p = p->next)
  99         if (p->type == para_VersionID)
 100             ps_comment(fp, "% ", p->words);
 101
 102     for (fe = doc->fonts->head; fe; fe = fe->next) {
 103         /* XXX This may request the same font multiple times. */
 104         if (fe->font->info->fp) {
 105             char buf[512];
 106             size_t len;
 107             fprintf(fp, "%%%%BeginResource: font %s\n", fe->font->info->name);
 108             rewind(fe->font->info->fp);
 109             do {
 110                 len = fread(buf, 1, sizeof(buf), fe->font->info->fp);
 111                 fwrite(buf, 1, len, fp);
 112             } while (len == sizeof(buf));
 113             fprintf(fp, "%%%%EndResource\n");
 114         } else {
 115             fprintf(fp, "%%%%IncludeResource: font %s\n",
 116                     fe->font->info->name);
 117         }
 118     }
 119
 120     /*
 121      * Re-encode the fonts.
 122      */
 123     font_index = 0;
 124     for (fe = doc->fonts->head; fe; fe = fe->next) {
 125         char fname[40];
 126         int i;
 127
 128         sprintf(fname, "f%d", font_index++);
 129         fe->name = dupstr(fname);
 130
 131         fprintf(fp, "/%s findfont dup length dict begin\n",
 132             fe->font->info->name);
 133         fprintf(fp, "{1 index /FID ne {def} {pop pop} ifelse} forall\n");
 134         fprintf(fp, "/Encoding [\n");
 135         for (i = 0; i < 256; i++)
 136             fprintf(fp, "/%s%c", fe->vector[i] ? fe->vector[i] : ".notdef",
 137                     i % 4 == 3 ? '\n' : ' ');
 138         fprintf(fp, "] def\n");
 139         fprintf(fp, "currentdict end\n");
 140         fprintf(fp, "/fontname-%s exch definefont /%s exch def\n\n",
 141                fe->name, fe->name);
 142     }
 143     fprintf(fp, "%%%%EndSetup\n");
 144
 145     /*
 146      * Output the text and graphics.
 147      */
 148     pageno = 0;
 149     for (page = doc->pages; page; page = page->next) {
 150         text_fragment *frag, *frag_end;
 151         rect *r;
 152         font_encoding *fe;
 153         int fs;
 154
 155         pageno++;
 156         fprintf(fp, "%%%%Page: %d %d\n", pageno, pageno);
 157         fprintf(fp, "save\n");
 158
 159 #if 0
 160         {
 161             xref *xr;
 162             /*
 163              * I used this diagnostic briefly to ensure that
 164              * cross-reference rectangles were being put where they
 165              * should be.
 166              */
 167             for (xr = page->first_xref; xr; xr = xr->next) {
 168                 fprintf(fp, "gsave 0.7 setgray %g %g moveto",
 169                         xr->lx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
 170                 fprintf(fp, " %g %g lineto %g %g lineto",
 171                         xr->lx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT,
 172                         xr->rx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT);
 173                 fprintf(fp, " %g %g lineto closepath fill grestore\n",
 174                         xr->rx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT);
 175             }
 176         }
 177 #endif
 178
 179         for (r = page->first_rect; r; r = r->next) {
 180             fprintf(fp, "%g %g moveto %g 0 rlineto 0 %g rlineto "
 181                     "-%g 0 rlineto closepath fill\n",
 182                     r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT,
 183                     r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT,
 184                     r->w / FUNITS_PER_PT);
 185         }
 186
 187         frag = page->first_text;
 188         fe = NULL;
 189         fs = -1;
 190         while (frag) {
 191             char *c;
 192
 193             /*
 194              * Collect all the adjacent text fragments with the
 195              * same y-coordinate.
 196              */
 197             for (frag_end = frag;
 198                  frag_end && frag_end->y == frag->y;
 199                  frag_end = frag_end->next);
 200
 201             fprintf(fp, "%g[", frag->y / FUNITS_PER_PT);
 202
 203             while (frag && frag != frag_end) {
 204
 205                 if (frag->fe != fe || frag->fontsize != fs)
 206                     fprintf(fp, "[%s %d]", frag->fe->name, frag->fontsize);
 207                 fe = frag->fe;
 208                 fs = frag->fontsize;
 209
 210                 fprintf(fp, "%g(", frag->x/FUNITS_PER_PT);
 211                 for (c = frag->text; *c; c++) {
 212                     if (*c == '(' || *c == ')' || *c == '\\')
 213                         fputc('\\', fp);
 214                     fputc(*c, fp);
 215                 }
 216                 fprintf(fp, ")");
 217
 218                 frag = frag->next;
 219             }
 220
 221             fprintf(fp, "]t\n");
 222         }
 223
 224         fprintf(fp, "restore showpage\n");
 225     }
 226
 227     fprintf(fp, "%%%%EOF\n");
 228
 229     fclose(fp);
 230
 231     sfree(filename);
 232 }
 233
 234 static void ps_comment(FILE *fp, char const *leader, word *words)
 235 {
 236     fprintf(fp, "%s", leader);
 237
 238     for (; words; words = words->next) {
 239         char *text;
 240         int type;
 241
 242         switch (words->type) {
 243           case word_HyperLink:
 244           case word_HyperEnd:
 245           case word_UpperXref:
 246           case word_LowerXref:
 247           case word_XrefEnd:
 248           case word_IndexRef:
 249             continue;
 250         }
 251
 252         type = removeattr(words->type);
 253
 254         switch (type) {
 255           case word_Normal:
 256             text = utoa_dup(words->text, CS_ASCII);
 257             break;
 258           case word_WhiteSpace:
 259             text = dupstr(" ");
 260             break;
 261           case word_Quote:
 262             text = dupstr("'");
 263             break;
 264         }
 265
 266         fputs(text, fp);
 267         sfree(text);
 268     }
 269
 270     fprintf(fp, "\n");
 271 }