| 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 { pop } bind def\n" |
| 118 | " /x { pop pop } bind def\n" |
| 119 | " /u /x load def\n" |
| 120 | "} ifelse\n"); |
| 121 | |
| 122 | fprintf(fp, "%%%%EndResource\n"); |
| 123 | fprintf(fp, "%%%%EndProlog\n"); |
| 124 | |
| 125 | fprintf(fp, "%%%%BeginSetup\n"); |
| 126 | |
| 127 | /* |
| 128 | * Assign a destination name to each page for pdfmark purposes. |
| 129 | */ |
| 130 | pageno = 0; |
| 131 | for (page = doc->pages; page; page = page->next) { |
| 132 | char *buf; |
| 133 | pageno++; |
| 134 | buf = snewn(12, char); |
| 135 | sprintf(buf, "/p%d", pageno); |
| 136 | page->spare = buf; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * This is as good a place as any to put version IDs. |
| 141 | */ |
| 142 | for (p = sourceform; p; p = p->next) |
| 143 | if (p->type == para_VersionID) |
| 144 | ps_comment(fp, "% ", p->words); |
| 145 | |
| 146 | /* |
| 147 | * Request the correct page size. We might want to bracket this |
| 148 | * with "%%BeginFeature: *PageSize A4" or similar, and "%%EndFeature", |
| 149 | * but that would require us to have a way of getting the name of |
| 150 | * the page size given its dimensions. |
| 151 | */ |
| 152 | fprintf(fp, "/setpagedevice where {\n"); |
| 153 | fprintf(fp, " pop 2 dict dup /PageSize [%g %g] put setpagedevice\n", |
| 154 | doc->paper_width / FUNITS_PER_PT, |
| 155 | doc->paper_height / FUNITS_PER_PT); |
| 156 | fprintf(fp, "} if\n"); |
| 157 | |
| 158 | /* Outline etc, only if pdfmark is supported */ |
| 159 | fprintf(fp, "/pdfmark where { pop %% if\n"); |
| 160 | fprintf(fp, " [/PageMode/UseOutlines/DOCVIEW pdfmark\n"); |
| 161 | noe = doc->n_outline_elements; |
| 162 | for (oe = doc->outline_elements; noe; oe++, noe--) { |
| 163 | char *title; |
| 164 | int titlelen, count, i; |
| 165 | |
| 166 | title = pdf_outline_convert(oe->pdata->outline_title, &titlelen); |
| 167 | |
| 168 | count = 0; |
| 169 | for (i = 1; i < noe && oe[i].level > oe->level; i++) |
| 170 | if (oe[i].level == oe->level + 1) |
| 171 | count++; |
| 172 | if (oe->level > 0) count = -count; |
| 173 | |
| 174 | fprintf(fp, " [/Title"); |
| 175 | ps_string_len(fp, title, titlelen); |
| 176 | sfree(title); |
| 177 | fprintf(fp, "/Dest%s/Count %d/OUT pdfmark\n", |
| 178 | (char *)oe->pdata->first->page->spare, count); |
| 179 | } |
| 180 | fprintf(fp, "} if\n"); |
| 181 | |
| 182 | for (fe = doc->fonts->head; fe; fe = fe->next) { |
| 183 | /* XXX This may request the same font multiple times. */ |
| 184 | if (fe->font->info->fp) { |
| 185 | char buf[512]; |
| 186 | size_t len; |
| 187 | fprintf(fp, "%%%%BeginResource: font %s\n", fe->font->info->name); |
| 188 | rewind(fe->font->info->fp); |
| 189 | do { |
| 190 | len = fread(buf, 1, sizeof(buf), fe->font->info->fp); |
| 191 | fwrite(buf, 1, len, fp); |
| 192 | } while (len == sizeof(buf)); |
| 193 | fprintf(fp, "%%%%EndResource\n"); |
| 194 | } else { |
| 195 | fprintf(fp, "%%%%IncludeResource: font %s\n", |
| 196 | fe->font->info->name); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Re-encode the fonts. |
| 202 | */ |
| 203 | font_index = 0; |
| 204 | for (fe = doc->fonts->head; fe; fe = fe->next) { |
| 205 | char fname[40]; |
| 206 | int i; |
| 207 | |
| 208 | sprintf(fname, "f%d", font_index++); |
| 209 | fe->name = dupstr(fname); |
| 210 | |
| 211 | fprintf(fp, "/%s findfont dup length dict begin\n", |
| 212 | fe->font->info->name); |
| 213 | fprintf(fp, "{1 index /FID ne {def} {pop pop} ifelse} forall\n"); |
| 214 | fprintf(fp, "/Encoding [\n"); |
| 215 | for (i = 0; i < 256; i++) |
| 216 | fprintf(fp, "/%s%c", fe->vector[i] ? fe->vector[i] : ".notdef", |
| 217 | i % 4 == 3 ? '\n' : ' '); |
| 218 | fprintf(fp, "] def\n"); |
| 219 | fprintf(fp, "currentdict end\n"); |
| 220 | fprintf(fp, "/fontname-%s exch definefont /%s exch def\n\n", |
| 221 | fe->name, fe->name); |
| 222 | } |
| 223 | fprintf(fp, "%%%%EndSetup\n"); |
| 224 | |
| 225 | /* |
| 226 | * Output the text and graphics. |
| 227 | */ |
| 228 | pageno = 0; |
| 229 | for (page = doc->pages; page; page = page->next) { |
| 230 | text_fragment *frag, *frag_end; |
| 231 | rect *r; |
| 232 | xref *xr; |
| 233 | font_encoding *fe; |
| 234 | int fs; |
| 235 | |
| 236 | pageno++; |
| 237 | fprintf(fp, "%%%%Page: %d %d\n", pageno, pageno); |
| 238 | fprintf(fp, "save %s p\n", (char *)page->spare); |
| 239 | |
| 240 | for (xr = page->first_xref; xr; xr = xr->next) { |
| 241 | fprintf(fp, "[%g %g %g %g]", |
| 242 | xr->lx/FUNITS_PER_PT, xr->by/FUNITS_PER_PT, |
| 243 | xr->rx/FUNITS_PER_PT, xr->ty/FUNITS_PER_PT); |
| 244 | if (xr->dest.type == PAGE) { |
| 245 | fprintf(fp, "%s x\n", (char *)xr->dest.page->spare); |
| 246 | } else { |
| 247 | ps_string(fp, xr->dest.url); |
| 248 | fprintf(fp, "u\n"); |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | for (r = page->first_rect; r; r = r->next) { |
| 253 | fprintf(fp, "%g %g %g %g r\n", |
| 254 | r->x / FUNITS_PER_PT, r->y / FUNITS_PER_PT, |
| 255 | r->w / FUNITS_PER_PT, r->h / FUNITS_PER_PT); |
| 256 | } |
| 257 | |
| 258 | frag = page->first_text; |
| 259 | fe = NULL; |
| 260 | fs = -1; |
| 261 | while (frag) { |
| 262 | /* |
| 263 | * Collect all the adjacent text fragments with the |
| 264 | * same y-coordinate. |
| 265 | */ |
| 266 | for (frag_end = frag; |
| 267 | frag_end && frag_end->y == frag->y; |
| 268 | frag_end = frag_end->next); |
| 269 | |
| 270 | fprintf(fp, "%g[", frag->y / FUNITS_PER_PT); |
| 271 | |
| 272 | while (frag && frag != frag_end) { |
| 273 | |
| 274 | if (frag->fe != fe || frag->fontsize != fs) |
| 275 | fprintf(fp, "[%s %d]", frag->fe->name, frag->fontsize); |
| 276 | fe = frag->fe; |
| 277 | fs = frag->fontsize; |
| 278 | |
| 279 | fprintf(fp, "%g", frag->x/FUNITS_PER_PT); |
| 280 | ps_string(fp, frag->text); |
| 281 | |
| 282 | frag = frag->next; |
| 283 | } |
| 284 | |
| 285 | fprintf(fp, "]t\n"); |
| 286 | } |
| 287 | |
| 288 | fprintf(fp, "restore showpage\n"); |
| 289 | } |
| 290 | |
| 291 | fprintf(fp, "%%%%EOF\n"); |
| 292 | |
| 293 | fclose(fp); |
| 294 | |
| 295 | sfree(filename); |
| 296 | } |
| 297 | |
| 298 | static void ps_comment(FILE *fp, char const *leader, word *words) |
| 299 | { |
| 300 | fprintf(fp, "%s", leader); |
| 301 | |
| 302 | for (; words; words = words->next) { |
| 303 | char *text; |
| 304 | int type; |
| 305 | |
| 306 | switch (words->type) { |
| 307 | case word_HyperLink: |
| 308 | case word_HyperEnd: |
| 309 | case word_UpperXref: |
| 310 | case word_LowerXref: |
| 311 | case word_XrefEnd: |
| 312 | case word_IndexRef: |
| 313 | continue; |
| 314 | } |
| 315 | |
| 316 | type = removeattr(words->type); |
| 317 | |
| 318 | switch (type) { |
| 319 | case word_Normal: |
| 320 | text = utoa_dup(words->text, CS_ASCII); |
| 321 | break; |
| 322 | case word_WhiteSpace: |
| 323 | text = dupstr(" "); |
| 324 | break; |
| 325 | case word_Quote: |
| 326 | text = dupstr("'"); |
| 327 | break; |
| 328 | } |
| 329 | |
| 330 | fputs(text, fp); |
| 331 | sfree(text); |
| 332 | } |
| 333 | |
| 334 | fprintf(fp, "\n"); |
| 335 | } |
| 336 | |
| 337 | static void ps_string_len(FILE *fp, char const *str, int len) { |
| 338 | char const *c; |
| 339 | int score = 0; |
| 340 | |
| 341 | for (c = str; c < str+len; c++) { |
| 342 | if (*c < ' ' || *c > '~') |
| 343 | score += 2; |
| 344 | else if (*c == '(' || *c == ')' || *c == '\\') |
| 345 | score += 0; |
| 346 | else |
| 347 | score -= 1; |
| 348 | } |
| 349 | if (score > 0) { |
| 350 | fprintf(fp, "<"); |
| 351 | for (c = str; c < str+len; c++) { |
| 352 | fprintf(fp, "%02X", 0xFF & (int)*c); |
| 353 | } |
| 354 | fprintf(fp, ">"); |
| 355 | } else { |
| 356 | fprintf(fp, "("); |
| 357 | for (c = str; c < str+len; c++) { |
| 358 | if (*c < ' ' || *c > '~') { |
| 359 | fprintf(fp, "\\%03o", 0xFF & (int)*c); |
| 360 | } else { |
| 361 | if (*c == '(' || *c == ')' || *c == '\\') |
| 362 | fputc('\\', fp); |
| 363 | fputc(*c, fp); |
| 364 | } |
| 365 | } |
| 366 | fprintf(fp, ")"); |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | static void ps_string(FILE *fp, char const *str) { |
| 371 | ps_string_len(fp, str, strlen(str)); |
| 372 | } |