43341922 |
1 | /* |
2 | * Paper printing pre-backend for Halibut. |
3 | * |
4 | * This module does all the processing common to both PostScript |
5 | * and PDF output: selecting fonts, line wrapping and page breaking |
6 | * in accordance with font metrics, laying out the contents and |
7 | * index pages, generally doing all the page layout. After this, |
8 | * bk_ps.c and bk_pdf.c should only need to do linear translations |
9 | * into their literal output format. |
10 | */ |
11 | |
12 | /* |
13 | * To be done: |
14 | * |
43341922 |
15 | * - set up contents section now we know what sections begin on |
16 | * which pages |
17 | * |
43341922 |
18 | * - index |
19 | * |
a8070b46 |
20 | * - header/footer? Page numbers at least would be handy. Fully |
21 | * configurable footer can wait, though. |
22 | * |
43341922 |
23 | * That should bring us to the same level of functionality that |
24 | * original-Halibut had, and the same in PDF plus the obvious |
25 | * interactive navigation features. After that, in future work: |
26 | * |
27 | * - linearised PDF, perhaps? |
28 | * |
29 | * - I'm uncertain of whether I need to include a ToUnicode CMap |
30 | * in each of my font definitions in PDF. Currently things (by |
31 | * which I mean cut and paste out of acroread) seem to be |
32 | * working fairly happily without it, but I don't know. |
33 | * |
34 | * - configurability |
35 | * |
36 | * - title pages |
37 | */ |
38 | |
39 | #include <assert.h> |
40 | #include <stdio.h> |
41 | |
42 | #include "halibut.h" |
43 | #include "paper.h" |
44 | |
45 | static font_data *make_std_font(font_list *fontlist, char const *name); |
46 | static void wrap_paragraph(para_data *pdata, word *words, |
47 | int w, int i1, int i2); |
48 | static page_data *page_breaks(line_data *first, line_data *last, |
49 | int page_height); |
138d7ffb |
50 | static void render_line(line_data *ldata, int left_x, int top_y, |
51 | xref_dest *dest, keywordlist *keywords); |
515d216b |
52 | static int paper_width_simple(para_data *pdata, word *text); |
53 | static void code_paragraph(para_data *pdata, |
54 | font_data *fn, font_data *fi, font_data *fb, |
55 | int font_size, int indent, word *words); |
87bd6353 |
56 | static void rule_paragraph(para_data *pdata, int indent, int height); |
23765aeb |
57 | static void add_rect_to_page(page_data *page, int x, int y, int w, int h); |
43341922 |
58 | |
59 | void *paper_pre_backend(paragraph *sourceform, keywordlist *keywords, |
60 | indexdata *idx) { |
61 | paragraph *p; |
62 | document *doc; |
515d216b |
63 | int indent, extra_indent, firstline_indent, aux_indent; |
43341922 |
64 | para_data *pdata; |
65 | line_data *ldata, *firstline, *lastline; |
515d216b |
66 | font_data *tr, *ti, *hr, *hi, *cr, *co, *cb; |
43341922 |
67 | page_data *pages; |
68 | font_list *fontlist; |
515d216b |
69 | word *aux, *aux2; |
43341922 |
70 | |
71 | /* |
72 | * FIXME: All these things ought to become configurable. |
73 | */ |
74 | int paper_width = 595 * 4096; |
75 | int paper_height = 841 * 4096; |
76 | int left_margin = 72 * 4096; |
77 | int top_margin = 72 * 4096; |
78 | int right_margin = 72 * 4096; |
79 | int bottom_margin = 108 * 4096; |
80 | int indent_list_bullet = 6 * 4096; |
81 | int indent_list = 24 * 4096; |
82 | int indent_quote = 18 * 4096; |
83 | int base_leading = 4096; |
84 | int base_para_spacing = 10 * 4096; |
515d216b |
85 | int chapter_top_space = 72 * 4096; |
86 | int sect_num_left_space = 12 * 4096; |
23765aeb |
87 | int chapter_underline_depth = 14 * 4096; |
88 | int chapter_underline_thickness = 3 * 4096; |
87bd6353 |
89 | int rule_thickness = 1 * 4096; |
43341922 |
90 | |
91 | int base_width = paper_width - left_margin - right_margin; |
92 | int page_height = paper_height - top_margin - bottom_margin; |
93 | |
43341922 |
94 | IGNORE(idx); /* FIXME */ |
43341922 |
95 | |
96 | /* |
97 | * First, set up some font structures. |
98 | */ |
99 | fontlist = mknew(font_list); |
100 | fontlist->head = fontlist->tail = NULL; |
101 | tr = make_std_font(fontlist, "Times-Roman"); |
102 | ti = make_std_font(fontlist, "Times-Italic"); |
515d216b |
103 | hr = make_std_font(fontlist, "Helvetica-Bold"); |
104 | hi = make_std_font(fontlist, "Helvetica-BoldOblique"); |
43341922 |
105 | cr = make_std_font(fontlist, "Courier"); |
515d216b |
106 | co = make_std_font(fontlist, "Courier-Oblique"); |
107 | cb = make_std_font(fontlist, "Courier-Bold"); |
43341922 |
108 | |
109 | /* |
110 | * Go through and break up each paragraph into lines. |
111 | */ |
112 | indent = 0; |
113 | firstline = lastline = NULL; |
114 | for (p = sourceform; p; p = p->next) { |
115 | p->private_data = NULL; |
116 | |
117 | switch (p->type) { |
118 | /* |
119 | * These paragraph types are either invisible or don't |
120 | * define text in the normal sense. Either way, they |
121 | * don't require wrapping. |
122 | */ |
123 | case para_IM: |
124 | case para_BR: |
43341922 |
125 | case para_Biblio: |
126 | case para_NotParaType: |
127 | case para_Config: |
128 | case para_VersionID: |
129 | case para_NoCite: |
130 | break; |
131 | |
132 | /* |
133 | * These paragraph types don't require wrapping, but |
134 | * they do affect the line width to which we wrap the |
135 | * rest of the paragraphs, so we need to pay attention. |
136 | */ |
137 | case para_LcontPush: |
138 | indent += indent_list; break; |
139 | case para_LcontPop: |
140 | indent -= indent_list; assert(indent >= 0); break; |
141 | case para_QuotePush: |
142 | indent += indent_quote; break; |
143 | case para_QuotePop: |
144 | indent -= indent_quote; assert(indent >= 0); break; |
145 | |
146 | /* |
147 | * This paragraph type is special. Process it |
148 | * specially. |
149 | */ |
150 | case para_Code: |
515d216b |
151 | pdata = mknew(para_data); |
152 | code_paragraph(pdata, cr, co, cb, 12, indent, p->words); |
153 | p->private_data = pdata; |
39a0cfb9 |
154 | if (pdata->first != pdata->last) { |
155 | pdata->first->penalty_after += 100000; |
156 | pdata->last->penalty_before += 100000; |
157 | } |
43341922 |
158 | break; |
159 | |
160 | /* |
87bd6353 |
161 | * This paragraph is also special. |
162 | */ |
163 | case para_Rule: |
164 | pdata = mknew(para_data); |
165 | rule_paragraph(pdata, indent, rule_thickness); |
166 | p->private_data = pdata; |
167 | break; |
168 | |
169 | /* |
43341922 |
170 | * All of these paragraph types require wrapping in the |
171 | * ordinary way. So we must supply a set of fonts, a |
172 | * line width and auxiliary information (e.g. bullet |
173 | * text) for each one. |
174 | */ |
175 | case para_Chapter: |
176 | case para_Appendix: |
177 | case para_UnnumberedChapter: |
178 | case para_Heading: |
179 | case para_Subsect: |
180 | case para_Normal: |
181 | case para_BiblioCited: |
182 | case para_Bullet: |
183 | case para_NumberedList: |
184 | case para_DescribedThing: |
185 | case para_Description: |
186 | case para_Copyright: |
187 | case para_Title: |
188 | pdata = mknew(para_data); |
189 | |
190 | /* |
515d216b |
191 | * Choose fonts for this paragraph. |
192 | * |
193 | * FIXME: All of this ought to be completely |
194 | * user-configurable. |
43341922 |
195 | */ |
515d216b |
196 | switch (p->type) { |
197 | case para_Title: |
198 | pdata->fonts[FONT_NORMAL] = hr; |
199 | pdata->sizes[FONT_NORMAL] = 24; |
200 | pdata->fonts[FONT_EMPH] = hi; |
201 | pdata->sizes[FONT_EMPH] = 24; |
202 | pdata->fonts[FONT_CODE] = cb; |
203 | pdata->sizes[FONT_CODE] = 24; |
204 | break; |
205 | |
206 | case para_Chapter: |
207 | case para_Appendix: |
208 | case para_UnnumberedChapter: |
209 | pdata->fonts[FONT_NORMAL] = hr; |
210 | pdata->sizes[FONT_NORMAL] = 20; |
211 | pdata->fonts[FONT_EMPH] = hi; |
212 | pdata->sizes[FONT_EMPH] = 20; |
213 | pdata->fonts[FONT_CODE] = cb; |
214 | pdata->sizes[FONT_CODE] = 20; |
215 | break; |
216 | |
217 | case para_Heading: |
218 | case para_Subsect: |
219 | pdata->fonts[FONT_NORMAL] = hr; |
220 | pdata->fonts[FONT_EMPH] = hi; |
221 | pdata->fonts[FONT_CODE] = cb; |
222 | pdata->sizes[FONT_NORMAL] = |
223 | pdata->sizes[FONT_EMPH] = |
224 | pdata->sizes[FONT_CODE] = |
225 | (p->aux == 0 ? 16 : p->aux == 1 ? 14 : 13); |
226 | break; |
227 | |
228 | case para_Normal: |
229 | case para_BiblioCited: |
230 | case para_Bullet: |
231 | case para_NumberedList: |
232 | case para_DescribedThing: |
233 | case para_Description: |
234 | case para_Copyright: |
235 | pdata->fonts[FONT_NORMAL] = tr; |
236 | pdata->sizes[FONT_NORMAL] = 12; |
237 | pdata->fonts[FONT_EMPH] = ti; |
238 | pdata->sizes[FONT_EMPH] = 12; |
239 | pdata->fonts[FONT_CODE] = cr; |
240 | pdata->sizes[FONT_CODE] = 12; |
241 | break; |
242 | } |
43341922 |
243 | |
244 | /* |
515d216b |
245 | * Also select an indentation level depending on the |
246 | * paragraph type (list paragraphs other than |
43341922 |
247 | * para_DescribedThing need extra indent). |
248 | * |
515d216b |
249 | * (FIXME: Perhaps at some point we might even arrange |
250 | * for the user to be able to request indented first |
251 | * lines in paragraphs.) |
43341922 |
252 | */ |
515d216b |
253 | if (p->type == para_Bullet || |
254 | p->type == para_NumberedList || |
255 | p->type == para_Description) { |
256 | extra_indent = firstline_indent = indent_list; |
257 | } else { |
258 | extra_indent = firstline_indent = 0; |
259 | } |
260 | |
261 | /* |
262 | * Find the auxiliary text for this paragraph. |
263 | */ |
264 | aux = aux2 = NULL; |
265 | aux_indent = 0; |
266 | |
267 | switch (p->type) { |
268 | case para_Chapter: |
269 | case para_Appendix: |
270 | case para_Heading: |
271 | case para_Subsect: |
272 | /* |
273 | * For some heading styles (FIXME: be able to |
274 | * configure which), the auxiliary text contains |
275 | * the chapter number and is arranged to be |
276 | * right-aligned a few points left of the primary |
277 | * margin. For other styles, the auxiliary text is |
278 | * the full chapter _name_ and takes up space |
279 | * within the (wrapped) chapter title, meaning that |
280 | * we must move the first line indent over to make |
281 | * space for it. |
282 | */ |
283 | if (p->type == para_Heading || p->type == para_Subsect) { |
284 | int len; |
285 | |
286 | aux = p->kwtext2; |
287 | len = paper_width_simple(pdata, p->kwtext2); |
288 | aux_indent = -len - sect_num_left_space; |
289 | } else { |
290 | aux = p->kwtext; |
291 | aux2 = mknew(word); |
292 | aux2->next = NULL; |
293 | aux2->alt = NULL; |
294 | aux2->type = word_Normal; |
295 | aux2->text = ustrdup(L": "); |
296 | aux2->breaks = FALSE; |
297 | aux2->aux = 0; |
298 | aux_indent = 0; |
299 | |
300 | firstline_indent += paper_width_simple(pdata, aux); |
301 | firstline_indent += paper_width_simple(pdata, aux2); |
302 | } |
303 | break; |
304 | |
305 | case para_Bullet: |
306 | /* |
307 | * Auxiliary text consisting of a bullet. (FIXME: |
308 | * configurable bullet.) |
309 | */ |
310 | aux = mknew(word); |
311 | aux->next = NULL; |
312 | aux->alt = NULL; |
313 | aux->type = word_Normal; |
314 | aux->text = ustrdup(L"\x2022"); |
315 | aux->breaks = FALSE; |
316 | aux->aux = 0; |
317 | aux_indent = indent + indent_list_bullet; |
318 | break; |
319 | |
320 | case para_NumberedList: |
321 | /* |
322 | * Auxiliary text consisting of the number followed |
323 | * by a (FIXME: configurable) full stop. |
324 | */ |
325 | aux = p->kwtext; |
326 | aux2 = mknew(word); |
327 | aux2->next = NULL; |
328 | aux2->alt = NULL; |
329 | aux2->type = word_Normal; |
330 | aux2->text = ustrdup(L"."); |
331 | aux2->breaks = FALSE; |
332 | aux2->aux = 0; |
333 | aux_indent = indent + indent_list_bullet; |
334 | break; |
335 | |
336 | case para_BiblioCited: |
337 | /* |
338 | * Auxiliary text consisting of the bibliography |
339 | * reference text, and a trailing space. |
340 | */ |
341 | aux = p->kwtext; |
342 | aux2 = mknew(word); |
343 | aux2->next = NULL; |
344 | aux2->alt = NULL; |
345 | aux2->type = word_Normal; |
346 | aux2->text = ustrdup(L" "); |
347 | aux2->breaks = FALSE; |
348 | aux2->aux = 0; |
349 | aux_indent = indent; |
350 | firstline_indent += paper_width_simple(pdata, aux); |
351 | firstline_indent += paper_width_simple(pdata, aux2); |
352 | break; |
353 | } |
43341922 |
354 | |
355 | wrap_paragraph(pdata, p->words, base_width, |
356 | indent + firstline_indent, |
357 | indent + extra_indent); |
358 | |
43341922 |
359 | p->private_data = pdata; |
360 | |
515d216b |
361 | pdata->first->aux_text = aux; |
362 | pdata->first->aux_text_2 = aux2; |
363 | pdata->first->aux_left_indent = aux_indent; |
364 | |
39a0cfb9 |
365 | /* |
366 | * Line breaking penalties. |
367 | */ |
368 | switch (p->type) { |
369 | case para_Chapter: |
370 | case para_Appendix: |
371 | case para_Heading: |
372 | case para_Subsect: |
373 | case para_UnnumberedChapter: |
374 | /* |
375 | * Fixed and large penalty for breaking straight |
376 | * after a heading; corresponding bonus for |
377 | * breaking straight before. |
378 | */ |
379 | pdata->first->penalty_before = -500000; |
380 | pdata->last->penalty_after = 500000; |
381 | for (ldata = pdata->first; ldata; ldata = ldata->next) |
382 | ldata->penalty_after = 500000; |
383 | break; |
384 | |
385 | case para_DescribedThing: |
386 | /* |
387 | * This is treated a bit like a small heading: |
388 | * there's a penalty for breaking after it (i.e. |
389 | * between it and its description), and a bonus for |
390 | * breaking before it (actually _between_ list |
391 | * items). |
392 | */ |
393 | pdata->first->penalty_before = -200000; |
394 | pdata->last->penalty_after = 200000; |
395 | break; |
396 | |
397 | default: |
398 | /* |
399 | * Most paragraph types: widow/orphan control by |
400 | * discouraging breaking one line from the end of |
401 | * any paragraph. |
402 | */ |
403 | if (pdata->first != pdata->last) { |
404 | pdata->first->penalty_after = 100000; |
405 | pdata->last->penalty_before = 100000; |
406 | } |
407 | break; |
408 | } |
409 | |
515d216b |
410 | break; |
411 | } |
412 | |
413 | if (p->private_data) { |
414 | pdata = (para_data *)p->private_data; |
415 | |
43341922 |
416 | /* |
417 | * Set the line spacing for each line in this paragraph. |
418 | */ |
419 | for (ldata = pdata->first; ldata; ldata = ldata->next) { |
420 | if (ldata == pdata->first) |
421 | ldata->space_before = base_para_spacing / 2; |
422 | else |
423 | ldata->space_before = base_leading / 2; |
424 | if (ldata == pdata->last) |
425 | ldata->space_after = base_para_spacing / 2; |
426 | else |
427 | ldata->space_after = base_leading / 2; |
428 | ldata->page_break = FALSE; |
429 | } |
430 | |
431 | /* |
515d216b |
432 | * Some kinds of section heading do require a page |
433 | * break before them. |
43341922 |
434 | */ |
515d216b |
435 | if (p->type == para_Title || |
436 | p->type == para_Chapter || |
437 | p->type == para_Appendix || |
438 | p->type == para_UnnumberedChapter) { |
439 | pdata->first->page_break = TRUE; |
440 | pdata->first->space_before = chapter_top_space; |
23765aeb |
441 | pdata->last->space_after += |
442 | chapter_underline_depth + chapter_underline_thickness; |
515d216b |
443 | } |
43341922 |
444 | |
515d216b |
445 | /* |
446 | * Link all line structures together into a big list. |
447 | */ |
43341922 |
448 | if (pdata->first) { |
449 | if (lastline) { |
450 | lastline->next = pdata->first; |
451 | pdata->first->prev = lastline; |
452 | } else { |
453 | firstline = pdata->first; |
454 | pdata->first->prev = NULL; |
455 | } |
456 | lastline = pdata->last; |
457 | } |
458 | } |
459 | } |
460 | |
461 | /* |
462 | * Now we have an enormous linked list of every line of text in |
463 | * the document. Break it up into pages. |
464 | */ |
465 | pages = page_breaks(firstline, lastline, page_height); |
466 | |
467 | /* |
468 | * Now we're ready to actually lay out the pages. We do this by |
469 | * looping over _paragraphs_, since we may need to track cross- |
470 | * references between lines and even across pages. |
471 | */ |
472 | for (p = sourceform; p; p = p->next) { |
473 | pdata = (para_data *)p->private_data; |
474 | |
475 | if (pdata) { |
138d7ffb |
476 | xref_dest dest; |
477 | dest.type = NONE; |
43341922 |
478 | for (ldata = pdata->first; ldata; ldata = ldata->next) { |
138d7ffb |
479 | render_line(ldata, left_margin, paper_height - top_margin, |
480 | &dest, keywords); |
43341922 |
481 | if (ldata == pdata->last) |
482 | break; |
483 | } |
23765aeb |
484 | |
485 | /* |
486 | * Some section headings (FIXME: should be configurable |
487 | * which) want to be underlined. |
488 | */ |
489 | if (p->type == para_Chapter || p->type == para_Appendix || |
490 | p->type == para_UnnumberedChapter || p->type == para_Title) { |
491 | add_rect_to_page(pdata->last->page, |
492 | left_margin, |
493 | (paper_height - top_margin - |
494 | pdata->last->ypos - chapter_underline_depth), |
495 | base_width, |
496 | chapter_underline_thickness); |
497 | } |
87bd6353 |
498 | |
499 | /* |
500 | * Rule paragraphs need to contain an actual rule! |
501 | */ |
502 | if (p->type == para_Rule) { |
503 | add_rect_to_page(pdata->first->page, |
504 | left_margin + pdata->first->xpos, |
505 | (paper_height - top_margin - |
506 | pdata->last->ypos - |
507 | pdata->last->line_height), |
508 | base_width - pdata->first->xpos, |
509 | pdata->last->line_height); |
510 | } |
43341922 |
511 | } |
512 | } |
513 | |
f0e51ce1 |
514 | /* |
515 | * Start putting together the overall document structure we're |
516 | * going to return. |
517 | */ |
43341922 |
518 | doc = mknew(document); |
519 | doc->fonts = fontlist; |
520 | doc->pages = pages; |
521 | doc->paper_width = paper_width; |
522 | doc->paper_height = paper_height; |
f0e51ce1 |
523 | |
524 | /* |
525 | * Collect the section heading paragraphs into a document |
526 | * outline. This is slightly fiddly because the Title paragraph |
527 | * isn't required to be at the start, although all the others |
528 | * must be in order. |
529 | */ |
530 | { |
531 | int osize = 20; |
532 | |
533 | doc->outline_elements = mknewa(outline_element, osize); |
534 | doc->n_outline_elements = 0; |
535 | |
536 | /* First find the title. */ |
537 | for (p = sourceform; p; p = p->next) { |
538 | switch (p->type) { |
539 | case para_Title: |
540 | doc->outline_elements[0].level = 0; |
541 | doc->outline_elements[0].para = p; |
542 | doc->n_outline_elements++; |
543 | break; |
544 | } |
545 | } |
546 | |
547 | /* Then collect the rest. */ |
548 | for (p = sourceform; p; p = p->next) { |
549 | switch (p->type) { |
550 | case para_Chapter: |
551 | case para_UnnumberedChapter: |
552 | case para_Appendix: |
553 | case para_Heading: |
554 | case para_Subsect: |
555 | |
556 | if (doc->n_outline_elements >= osize) { |
557 | osize += 20; |
558 | doc->outline_elements = |
559 | resize(doc->outline_elements, osize); |
560 | } |
561 | |
562 | if (p->type == para_Heading) { |
563 | doc->outline_elements[doc->n_outline_elements].level = 2; |
564 | } else if (p->type == para_Subsect) { |
565 | doc->outline_elements[doc->n_outline_elements].level = |
566 | 3 + p->aux; |
567 | } else |
568 | doc->outline_elements[doc->n_outline_elements].level = 1; |
569 | |
570 | doc->outline_elements[doc->n_outline_elements].para = p; |
571 | doc->n_outline_elements++; |
572 | break; |
573 | } |
574 | } |
575 | } |
576 | |
43341922 |
577 | return doc; |
578 | } |
579 | |
580 | static font_encoding *new_font_encoding(font_data *font) |
581 | { |
582 | font_encoding *fe; |
583 | int i; |
584 | |
585 | fe = mknew(font_encoding); |
586 | fe->next = NULL; |
587 | |
588 | if (font->list->tail) |
589 | font->list->tail->next = fe; |
590 | else |
591 | font->list->head = fe; |
592 | font->list->tail = fe; |
593 | |
594 | fe->font = font; |
595 | fe->free_pos = 0x21; |
596 | |
597 | for (i = 0; i < 256; i++) { |
598 | fe->vector[i] = NULL; |
599 | fe->indices[i] = -1; |
600 | fe->to_unicode[i] = 0xFFFF; |
601 | } |
602 | |
603 | return fe; |
604 | } |
605 | |
606 | static font_data *make_std_font(font_list *fontlist, char const *name) |
607 | { |
608 | const int *widths; |
609 | int nglyphs; |
610 | font_data *f; |
611 | font_encoding *fe; |
612 | int i; |
613 | |
614 | widths = ps_std_font_widths(name); |
615 | if (!widths) |
616 | return NULL; |
617 | |
618 | for (nglyphs = 0; ps_std_glyphs[nglyphs] != NULL; nglyphs++); |
619 | |
620 | f = mknew(font_data); |
621 | |
622 | f->list = fontlist; |
623 | f->name = name; |
624 | f->nglyphs = nglyphs; |
625 | f->glyphs = ps_std_glyphs; |
626 | f->widths = widths; |
627 | f->subfont_map = mknewa(subfont_map_entry, nglyphs); |
628 | |
629 | /* |
630 | * Our first subfont will contain all of US-ASCII. This isn't |
631 | * really necessary - we could just create custom subfonts |
632 | * precisely as the whim of render_string dictated - but |
633 | * instinct suggests that it might be nice to have the text in |
634 | * the output files look _marginally_ recognisable. |
635 | */ |
636 | fe = new_font_encoding(f); |
637 | fe->free_pos = 0xA1; /* only the top half is free */ |
638 | f->latest_subfont = fe; |
639 | |
640 | for (i = 0; i < (int)lenof(f->bmp); i++) |
641 | f->bmp[i] = 0xFFFF; |
642 | |
643 | for (i = 0; i < nglyphs; i++) { |
644 | wchar_t ucs; |
645 | ucs = ps_glyph_to_unicode(f->glyphs[i]); |
646 | assert(ucs != 0xFFFF); |
647 | f->bmp[ucs] = i; |
648 | if (ucs >= 0x20 && ucs <= 0x7E) { |
649 | fe->vector[ucs] = f->glyphs[i]; |
650 | fe->indices[ucs] = i; |
651 | fe->to_unicode[ucs] = ucs; |
652 | f->subfont_map[i].subfont = fe; |
653 | f->subfont_map[i].position = ucs; |
654 | } else { |
655 | /* |
656 | * This character is not yet assigned to a subfont. |
657 | */ |
658 | f->subfont_map[i].subfont = NULL; |
659 | f->subfont_map[i].position = 0; |
660 | } |
661 | } |
662 | |
663 | return f; |
664 | } |
665 | |
666 | static int string_width(font_data *font, wchar_t const *string, int *errs) |
667 | { |
668 | int width = 0; |
669 | |
670 | if (errs) |
671 | *errs = 0; |
672 | |
673 | for (; *string; string++) { |
674 | int index; |
675 | |
676 | index = font->bmp[(unsigned short)*string]; |
677 | if (index == 0xFFFF) { |
678 | if (errs) |
679 | *errs = 1; |
680 | } else { |
681 | width += font->widths[index]; |
682 | } |
683 | } |
684 | |
685 | return width; |
686 | } |
687 | |
faad4952 |
688 | static int paper_width_internal(void *vctx, word *word, int *nspaces); |
43341922 |
689 | |
690 | struct paper_width_ctx { |
691 | int minspacewidth; |
692 | para_data *pdata; |
693 | }; |
694 | |
faad4952 |
695 | static int paper_width_list(void *vctx, word *text, word *end, int *nspaces) { |
43341922 |
696 | int w = 0; |
faad4952 |
697 | while (text && text != end) { |
698 | w += paper_width_internal(vctx, text, nspaces); |
43341922 |
699 | text = text->next; |
700 | } |
701 | return w; |
702 | } |
703 | |
faad4952 |
704 | static int paper_width_internal(void *vctx, word *word, int *nspaces) |
43341922 |
705 | { |
706 | struct paper_width_ctx *ctx = (struct paper_width_ctx *)vctx; |
707 | int style, type, findex, width, errs; |
708 | wchar_t *str; |
709 | |
710 | switch (word->type) { |
711 | case word_HyperLink: |
712 | case word_HyperEnd: |
713 | case word_UpperXref: |
714 | case word_LowerXref: |
715 | case word_XrefEnd: |
716 | case word_IndexRef: |
717 | return 0; |
718 | } |
719 | |
720 | style = towordstyle(word->type); |
721 | type = removeattr(word->type); |
722 | |
723 | findex = (style == word_Normal ? FONT_NORMAL : |
724 | style == word_Emph ? FONT_EMPH : |
725 | FONT_CODE); |
726 | |
727 | if (type == word_Normal) { |
728 | str = word->text; |
729 | } else if (type == word_WhiteSpace) { |
faad4952 |
730 | if (findex != FONT_CODE) { |
731 | if (nspaces) |
732 | (*nspaces)++; |
43341922 |
733 | return ctx->minspacewidth; |
faad4952 |
734 | } else |
43341922 |
735 | str = L" "; |
736 | } else /* if (type == word_Quote) */ { |
737 | if (word->aux == quote_Open) |
738 | str = L"\x2018"; /* FIXME: configurability! */ |
739 | else |
740 | str = L"\x2019"; /* FIXME: configurability! */ |
741 | } |
742 | |
743 | width = string_width(ctx->pdata->fonts[findex], str, &errs); |
744 | |
745 | if (errs && word->alt) |
faad4952 |
746 | return paper_width_list(vctx, word->alt, NULL, nspaces); |
43341922 |
747 | else |
748 | return ctx->pdata->sizes[findex] * width; |
749 | } |
750 | |
faad4952 |
751 | static int paper_width(void *vctx, word *word) |
752 | { |
753 | return paper_width_internal(vctx, word, NULL); |
754 | } |
755 | |
515d216b |
756 | static int paper_width_simple(para_data *pdata, word *text) |
757 | { |
758 | struct paper_width_ctx ctx; |
759 | |
760 | ctx.pdata = pdata; |
761 | ctx.minspacewidth = |
762 | (pdata->sizes[FONT_NORMAL] * |
763 | string_width(pdata->fonts[FONT_NORMAL], L" ", NULL)); |
764 | |
765 | return paper_width_list(&ctx, text, NULL, NULL); |
766 | } |
767 | |
43341922 |
768 | static void wrap_paragraph(para_data *pdata, word *words, |
769 | int w, int i1, int i2) |
770 | { |
771 | wrappedline *wrapping, *p; |
772 | int spacewidth; |
773 | struct paper_width_ctx ctx; |
774 | int line_height; |
775 | |
776 | /* |
777 | * We're going to need to store the line height in every line |
778 | * structure we generate. |
779 | */ |
780 | { |
781 | int i; |
782 | line_height = 0; |
783 | for (i = 0; i < NFONTS; i++) |
784 | if (line_height < pdata->sizes[i]) |
785 | line_height = pdata->sizes[i]; |
786 | line_height *= 4096; |
787 | } |
788 | |
789 | spacewidth = (pdata->sizes[FONT_NORMAL] * |
790 | string_width(pdata->fonts[FONT_NORMAL], L" ", NULL)); |
791 | if (spacewidth == 0) { |
792 | /* |
793 | * A font without a space?! Disturbing. I hope this never |
794 | * comes up, but I'll make a random guess anyway and set my |
795 | * space width to half the point size. |
796 | */ |
797 | spacewidth = pdata->sizes[FONT_NORMAL] * 4096 / 2; |
798 | } |
799 | |
800 | /* |
801 | * I'm going to set the _minimum_ space width to 3/5 of the |
802 | * standard one, and use the standard one as the optimum. |
803 | */ |
804 | ctx.minspacewidth = spacewidth * 3 / 5; |
805 | ctx.pdata = pdata; |
806 | |
807 | wrapping = wrap_para(words, w - i1, w - i2, paper_width, &ctx, spacewidth); |
808 | |
809 | /* |
810 | * Having done the wrapping, we now concoct a set of line_data |
811 | * structures. |
812 | */ |
813 | pdata->first = pdata->last = NULL; |
814 | |
815 | for (p = wrapping; p; p = p->next) { |
816 | line_data *ldata; |
817 | word *wd; |
818 | int len, wid, spaces; |
819 | |
820 | ldata = mknew(line_data); |
821 | |
822 | ldata->pdata = pdata; |
823 | ldata->first = p->begin; |
faad4952 |
824 | ldata->end = p->end; |
43341922 |
825 | ldata->line_height = line_height; |
826 | |
827 | ldata->xpos = (p == wrapping ? i1 : i2); |
828 | |
829 | if (pdata->last) { |
830 | pdata->last->next = ldata; |
831 | ldata->prev = pdata->last; |
832 | } else { |
833 | pdata->first = ldata; |
834 | ldata->prev = NULL; |
835 | } |
836 | ldata->next = NULL; |
837 | pdata->last = ldata; |
838 | |
43341922 |
839 | spaces = 0; |
faad4952 |
840 | len = paper_width_list(&ctx, ldata->first, ldata->end, &spaces); |
841 | wid = (p == wrapping ? w - i1 : w - i2); |
43341922 |
842 | wd = ldata->first; |
43341922 |
843 | |
faad4952 |
844 | ldata->hshortfall = wid - len; |
845 | ldata->nspaces = spaces; |
846 | /* |
847 | * This tells us how much the space width needs to |
848 | * change from _min_spacewidth. But we want to store |
849 | * its difference from the _natural_ space width, to |
850 | * make the text rendering easier. |
851 | */ |
852 | ldata->hshortfall += ctx.minspacewidth * spaces; |
853 | ldata->hshortfall -= spacewidth * spaces; |
854 | /* |
855 | * Special case: on the last line of a paragraph, we |
856 | * never stretch spaces. |
857 | */ |
858 | if (ldata->hshortfall > 0 && !p->next) |
859 | ldata->hshortfall = 0; |
43341922 |
860 | |
861 | ldata->aux_text = NULL; |
515d216b |
862 | ldata->aux_text_2 = NULL; |
43341922 |
863 | ldata->aux_left_indent = 0; |
39a0cfb9 |
864 | ldata->penalty_before = ldata->penalty_after = 0; |
43341922 |
865 | } |
866 | |
867 | } |
868 | |
869 | static page_data *page_breaks(line_data *first, line_data *last, |
870 | int page_height) |
871 | { |
872 | line_data *l, *m; |
873 | page_data *ph, *pt; |
874 | |
875 | /* |
876 | * Page breaking is done by a close analogue of the optimal |
877 | * paragraph wrapping algorithm used by wrap_para(). We work |
878 | * backwards from the end of the document line by line; for |
879 | * each line, we contemplate every possible number of lines we |
880 | * could put on a page starting with that line, determine a |
881 | * cost function for each one, add it to the pre-computed cost |
882 | * function for optimally page-breaking everything after that |
883 | * page, and pick the best option. |
884 | * |
885 | * Since my line_data structures are only used for this |
886 | * purpose, I might as well just store the algorithm data |
887 | * directly in them. |
888 | */ |
889 | |
890 | for (l = last; l; l = l->prev) { |
891 | int minheight, text = 0, space = 0; |
892 | int cost; |
893 | |
894 | l->bestcost = -1; |
895 | for (m = l; m; m = m->next) { |
896 | if (m != l && m->page_break) |
897 | break; /* we've gone as far as we can */ |
898 | |
899 | if (m != l) |
900 | space += m->prev->space_after; |
901 | if (m != l || m->page_break) |
902 | space += m->space_before; |
903 | text += m->line_height; |
904 | minheight = text + space; |
905 | |
906 | if (m != l && minheight > page_height) |
907 | break; |
908 | |
909 | /* |
910 | * Compute the cost of this arrangement, as the square |
911 | * of the amount of wasted space on the page. |
912 | * Exception: if this is the last page before a |
913 | * mandatory break or the document end, we don't |
914 | * penalise a large blank area. |
915 | */ |
916 | if (m->next && !m->next->page_break) |
917 | { |
918 | int x = page_height - minheight; |
919 | int xf; |
920 | |
921 | xf = x & 0xFF; |
922 | x >>= 8; |
923 | |
924 | cost = x*x; |
925 | cost += (x * xf) >> 8; |
926 | } else |
927 | cost = 0; |
928 | |
39a0cfb9 |
929 | if (m->next && !m->next->page_break) { |
930 | cost += m->penalty_after; |
931 | cost += m->next->penalty_before; |
932 | } |
43341922 |
933 | |
934 | if (m->next && !m->next->page_break) |
935 | cost += m->next->bestcost; |
43341922 |
936 | if (l->bestcost == -1 || l->bestcost > cost) { |
937 | /* |
938 | * This is the best option yet for this starting |
939 | * point. |
940 | */ |
941 | l->bestcost = cost; |
942 | if (m->next && !m->next->page_break) |
faad4952 |
943 | l->vshortfall = page_height - minheight; |
43341922 |
944 | else |
faad4952 |
945 | l->vshortfall = 0; |
43341922 |
946 | l->text = text; |
947 | l->space = space; |
948 | l->page_last = m; |
949 | } |
950 | } |
951 | } |
952 | |
953 | /* |
954 | * Now go through the line list forwards and assemble the |
955 | * actual pages. |
956 | */ |
957 | ph = pt = NULL; |
958 | |
959 | l = first; |
960 | while (l) { |
961 | page_data *page; |
962 | int text, space; |
963 | |
964 | page = mknew(page_data); |
965 | page->next = NULL; |
966 | page->prev = pt; |
967 | if (pt) |
968 | pt->next = page; |
969 | else |
970 | ph = page; |
971 | pt = page; |
972 | |
973 | page->first_line = l; |
974 | page->last_line = l->page_last; |
975 | |
976 | page->first_text = page->last_text = NULL; |
138d7ffb |
977 | page->first_xref = page->last_xref = NULL; |
23765aeb |
978 | page->first_rect = page->last_rect = NULL; |
138d7ffb |
979 | |
43341922 |
980 | /* |
981 | * Now assign a y-coordinate to each line on the page. |
982 | */ |
983 | text = space = 0; |
984 | for (l = page->first_line; l; l = l->next) { |
985 | if (l != page->first_line) |
986 | space += l->prev->space_after; |
987 | if (l != page->first_line || l->page_break) |
988 | space += l->space_before; |
989 | text += l->line_height; |
990 | |
991 | l->page = page; |
992 | l->ypos = text + space + |
faad4952 |
993 | space * (float)page->first_line->vshortfall / |
43341922 |
994 | page->first_line->space; |
995 | |
996 | if (l == page->last_line) |
997 | break; |
998 | } |
999 | |
1000 | l = page->last_line->next; |
1001 | } |
1002 | |
1003 | return ph; |
1004 | } |
1005 | |
23765aeb |
1006 | static void add_rect_to_page(page_data *page, int x, int y, int w, int h) |
1007 | { |
1008 | rect *r = mknew(rect); |
1009 | |
1010 | r->next = NULL; |
1011 | if (page->last_rect) |
1012 | page->last_rect->next = r; |
1013 | else |
1014 | page->first_rect = r; |
1015 | page->last_rect = r; |
1016 | |
1017 | r->x = x; |
1018 | r->y = y; |
1019 | r->w = w; |
1020 | r->h = h; |
1021 | } |
1022 | |
43341922 |
1023 | static void add_string_to_page(page_data *page, int x, int y, |
1024 | font_encoding *fe, int size, char *text) |
1025 | { |
1026 | text_fragment *frag; |
1027 | |
1028 | frag = mknew(text_fragment); |
1029 | frag->next = NULL; |
1030 | |
1031 | if (page->last_text) |
1032 | page->last_text->next = frag; |
1033 | else |
1034 | page->first_text = frag; |
1035 | page->last_text = frag; |
1036 | |
1037 | frag->x = x; |
1038 | frag->y = y; |
1039 | frag->fe = fe; |
1040 | frag->fontsize = size; |
1041 | frag->text = dupstr(text); |
1042 | } |
1043 | |
1044 | /* |
1045 | * Returns the updated x coordinate. |
1046 | */ |
1047 | static int render_string(page_data *page, font_data *font, int fontsize, |
1048 | int x, int y, wchar_t *str) |
1049 | { |
1050 | char *text; |
1051 | int textpos, textwid, glyph; |
1052 | font_encoding *subfont = NULL, *sf; |
1053 | |
1054 | text = mknewa(char, 1 + ustrlen(str)); |
1055 | textpos = textwid = 0; |
1056 | |
1057 | while (*str) { |
1058 | glyph = font->bmp[*str]; |
1059 | |
1060 | if (glyph == 0xFFFF) |
1061 | continue; /* nothing more we can do here */ |
1062 | |
1063 | /* |
1064 | * Find which subfont this character is going in. |
1065 | */ |
1066 | sf = font->subfont_map[glyph].subfont; |
1067 | |
1068 | if (!sf) { |
1069 | int c; |
1070 | |
1071 | /* |
1072 | * This character is not yet in a subfont. Assign one. |
1073 | */ |
1074 | if (font->latest_subfont->free_pos >= 0x100) |
1075 | font->latest_subfont = new_font_encoding(font); |
1076 | |
1077 | c = font->latest_subfont->free_pos++; |
1078 | if (font->latest_subfont->free_pos == 0x7F) |
1079 | font->latest_subfont->free_pos = 0xA1; |
1080 | |
1081 | font->subfont_map[glyph].subfont = font->latest_subfont; |
1082 | font->subfont_map[glyph].position = c; |
1083 | font->latest_subfont->vector[c] = font->glyphs[glyph]; |
1084 | font->latest_subfont->indices[c] = glyph; |
1085 | font->latest_subfont->to_unicode[c] = *str; |
1086 | |
1087 | sf = font->latest_subfont; |
1088 | } |
1089 | |
1090 | if (!subfont || sf != subfont) { |
1091 | if (subfont) { |
1092 | text[textpos] = '\0'; |
1093 | add_string_to_page(page, x, y, subfont, fontsize, text); |
1094 | x += textwid; |
1095 | } else { |
1096 | assert(textpos == 0); |
1097 | } |
1098 | textpos = 0; |
1099 | subfont = sf; |
1100 | } |
1101 | |
1102 | text[textpos++] = font->subfont_map[glyph].position; |
1103 | textwid += font->widths[glyph] * fontsize; |
1104 | |
1105 | str++; |
1106 | } |
1107 | |
1108 | if (textpos > 0) { |
1109 | text[textpos] = '\0'; |
1110 | add_string_to_page(page, x, y, subfont, fontsize, text); |
1111 | x += textwid; |
1112 | } |
1113 | |
1114 | return x; |
1115 | } |
1116 | |
1117 | /* |
1118 | * Returns the updated x coordinate. |
1119 | */ |
138d7ffb |
1120 | static int render_text(page_data *page, para_data *pdata, line_data *ldata, |
1121 | int x, int y, word *text, word *text_end, xref **xr, |
1122 | int shortfall, int nspaces, int *nspace, |
1123 | keywordlist *keywords) |
43341922 |
1124 | { |
faad4952 |
1125 | while (text && text != text_end) { |
43341922 |
1126 | int style, type, findex, errs; |
1127 | wchar_t *str; |
138d7ffb |
1128 | xref_dest dest; |
43341922 |
1129 | |
1130 | switch (text->type) { |
138d7ffb |
1131 | /* |
1132 | * Start a cross-reference. |
1133 | */ |
43341922 |
1134 | case word_HyperLink: |
43341922 |
1135 | case word_UpperXref: |
1136 | case word_LowerXref: |
138d7ffb |
1137 | |
1138 | if (text->type == word_HyperLink) { |
1139 | dest.type = URL; |
1140 | dest.url = utoa_dup(text->text); |
1141 | dest.page = NULL; |
1142 | } else { |
1143 | keyword *kwl = kw_lookup(keywords, text->text); |
1144 | para_data *pdata; |
1145 | |
1146 | if (kwl) { |
1147 | assert(kwl->para->private_data); |
1148 | pdata = (para_data *) kwl->para->private_data; |
1149 | dest.type = PAGE; |
1150 | dest.page = pdata->first->page; |
1151 | dest.url = NULL; |
1152 | } else { |
1153 | /* |
1154 | * Shouldn't happen, but *shrug* |
1155 | */ |
1156 | dest.type = NONE; |
1157 | dest.page = NULL; |
1158 | dest.url = NULL; |
1159 | } |
1160 | } |
1161 | if (dest.type != NONE) { |
1162 | *xr = mknew(xref); |
1163 | (*xr)->dest = dest; /* structure copy */ |
1164 | if (page->last_xref) |
1165 | page->last_xref->next = *xr; |
1166 | else |
1167 | page->first_xref = *xr; |
1168 | page->last_xref = *xr; |
23765aeb |
1169 | (*xr)->next = NULL; |
138d7ffb |
1170 | |
1171 | /* |
1172 | * FIXME: Ideally we should have, and use, some |
1173 | * vertical font metric information here so that |
1174 | * our cross-ref rectangle can take account of |
1175 | * descenders and the font's cap height. This will |
1176 | * do for the moment, but it isn't ideal. |
1177 | */ |
1178 | (*xr)->lx = (*xr)->rx = x; |
1179 | (*xr)->by = y; |
1180 | (*xr)->ty = y + ldata->line_height; |
1181 | } |
1182 | goto nextword; |
1183 | |
1184 | /* |
1185 | * Finish extending a cross-reference box. |
1186 | */ |
1187 | case word_HyperEnd: |
43341922 |
1188 | case word_XrefEnd: |
138d7ffb |
1189 | *xr = NULL; |
1190 | goto nextword; |
1191 | |
43341922 |
1192 | case word_IndexRef: |
1193 | goto nextword; |
1194 | /* |
a8070b46 |
1195 | * FIXME: we should do something with this. |
43341922 |
1196 | */ |
1197 | } |
1198 | |
1199 | style = towordstyle(text->type); |
1200 | type = removeattr(text->type); |
1201 | |
1202 | findex = (style == word_Normal ? FONT_NORMAL : |
1203 | style == word_Emph ? FONT_EMPH : |
1204 | FONT_CODE); |
1205 | |
1206 | if (type == word_Normal) { |
1207 | str = text->text; |
1208 | } else if (type == word_WhiteSpace) { |
1209 | x += pdata->sizes[findex] * |
1210 | string_width(pdata->fonts[findex], L" ", NULL); |
faad4952 |
1211 | if (nspaces && findex != FONT_CODE) { |
1212 | x += (*nspace+1) * shortfall / nspaces; |
1213 | x -= *nspace * shortfall / nspaces; |
1214 | (*nspace)++; |
1215 | } |
43341922 |
1216 | goto nextword; |
1217 | } else /* if (type == word_Quote) */ { |
1218 | if (text->aux == quote_Open) |
1219 | str = L"\x2018"; /* FIXME: configurability! */ |
1220 | else |
1221 | str = L"\x2019"; /* FIXME: configurability! */ |
1222 | } |
1223 | |
1224 | (void) string_width(pdata->fonts[findex], str, &errs); |
1225 | |
1226 | if (errs && text->alt) |
138d7ffb |
1227 | x = render_text(page, pdata, ldata, x, y, text->alt, NULL, |
1228 | xr, shortfall, nspaces, nspace, keywords); |
43341922 |
1229 | else |
1230 | x = render_string(page, pdata->fonts[findex], |
1231 | pdata->sizes[findex], x, y, str); |
1232 | |
138d7ffb |
1233 | if (*xr) |
1234 | (*xr)->rx = x; |
1235 | |
43341922 |
1236 | nextword: |
43341922 |
1237 | text = text->next; |
1238 | } |
1239 | |
1240 | return x; |
1241 | } |
1242 | |
138d7ffb |
1243 | static void render_line(line_data *ldata, int left_x, int top_y, |
1244 | xref_dest *dest, keywordlist *keywords) |
43341922 |
1245 | { |
faad4952 |
1246 | int nspace; |
138d7ffb |
1247 | xref *xr; |
1248 | |
faad4952 |
1249 | if (ldata->aux_text) { |
515d216b |
1250 | int x; |
138d7ffb |
1251 | xr = NULL; |
faad4952 |
1252 | nspace = 0; |
515d216b |
1253 | x = render_text(ldata->page, ldata->pdata, ldata, |
1254 | left_x + ldata->aux_left_indent, |
1255 | top_y - ldata->ypos, |
1256 | ldata->aux_text, NULL, &xr, 0, 0, &nspace, keywords); |
1257 | if (ldata->aux_text_2) |
1258 | render_text(ldata->page, ldata->pdata, ldata, |
1259 | x, top_y - ldata->ypos, |
1260 | ldata->aux_text_2, NULL, &xr, 0, 0, &nspace, keywords); |
faad4952 |
1261 | } |
1262 | nspace = 0; |
138d7ffb |
1263 | |
87bd6353 |
1264 | if (ldata->first) { |
138d7ffb |
1265 | /* |
87bd6353 |
1266 | * There might be a cross-reference carried over from a |
1267 | * previous line. |
138d7ffb |
1268 | */ |
87bd6353 |
1269 | if (dest->type != NONE) { |
1270 | xr = mknew(xref); |
1271 | xr->next = NULL; |
1272 | xr->dest = *dest; /* structure copy */ |
1273 | if (ldata->page->last_xref) |
1274 | ldata->page->last_xref->next = xr; |
1275 | else |
1276 | ldata->page->first_xref = xr; |
1277 | ldata->page->last_xref = xr; |
1278 | xr->lx = xr->rx = left_x + ldata->xpos; |
1279 | xr->by = top_y - ldata->ypos; |
1280 | xr->ty = top_y - ldata->ypos + ldata->line_height; |
1281 | } else |
1282 | xr = NULL; |
1283 | |
1284 | render_text(ldata->page, ldata->pdata, ldata, left_x + ldata->xpos, |
1285 | top_y - ldata->ypos, ldata->first, ldata->end, &xr, |
1286 | ldata->hshortfall, ldata->nspaces, &nspace, keywords); |
1287 | |
1288 | if (xr) { |
1289 | /* |
1290 | * There's a cross-reference continued on to the next line. |
1291 | */ |
1292 | *dest = xr->dest; |
1293 | } else |
1294 | dest->type = NONE; |
1295 | } |
43341922 |
1296 | } |
515d216b |
1297 | |
1298 | static void code_paragraph(para_data *pdata, |
1299 | font_data *fn, font_data *fi, font_data *fb, |
1300 | int font_size, int indent, word *words) |
1301 | { |
1302 | /* |
1303 | * For code paragraphs, I'm going to hack grievously and |
1304 | * pretend the three normal fonts are the three code paragraph |
1305 | * fonts. |
1306 | */ |
1307 | pdata->fonts[FONT_NORMAL] = fb; |
1308 | pdata->fonts[FONT_EMPH] = fi; |
1309 | pdata->fonts[FONT_CODE] = fn; |
1310 | pdata->sizes[FONT_NORMAL] = |
1311 | pdata->sizes[FONT_EMPH] = |
1312 | pdata->sizes[FONT_CODE] = font_size; |
1313 | |
1314 | pdata->first = pdata->last = NULL; |
1315 | |
1316 | for (; words; words = words->next) { |
1317 | wchar_t *t, *e, *start; |
1318 | word *lhead = NULL, *ltail = NULL, *w; |
1319 | line_data *ldata; |
1320 | int prev = -1, curr; |
1321 | |
1322 | t = words->text; |
1323 | if (words->next && words->next->type == word_Emph) { |
1324 | e = words->next->text; |
1325 | words = words->next; |
1326 | } else |
1327 | e = NULL; |
1328 | |
1329 | start = t; |
1330 | |
1331 | while (*start) { |
1332 | while (*t) { |
1333 | if (!e || !*e) |
1334 | curr = 0; |
1335 | else if (*e == L'i') |
1336 | curr = 1; |
1337 | else if (*e == L'b') |
1338 | curr = 2; |
1339 | else |
1340 | curr = 0; |
1341 | |
1342 | if (prev < 0) |
1343 | prev = curr; |
1344 | |
1345 | if (curr != prev) |
1346 | break; |
1347 | |
1348 | t++; |
1349 | if (e && *e) |
1350 | e++; |
1351 | } |
1352 | |
1353 | /* |
1354 | * We've isolated a maximal subsequence of the line |
1355 | * which has the same emphasis. Form it into a word |
1356 | * structure. |
1357 | */ |
1358 | w = mknew(word); |
1359 | w->next = NULL; |
1360 | w->alt = NULL; |
1361 | w->type = (prev == 0 ? word_WeakCode : |
1362 | prev == 1 ? word_Emph : word_Normal); |
1363 | w->text = mknewa(wchar_t, t-start+1); |
1364 | memcpy(w->text, start, (t-start) * sizeof(wchar_t)); |
1365 | w->text[t-start] = '\0'; |
1366 | w->breaks = FALSE; |
1367 | |
1368 | if (ltail) |
1369 | ltail->next = w; |
1370 | else |
1371 | lhead = w; |
1372 | ltail = w; |
1373 | |
1374 | start = t; |
1375 | prev = -1; |
1376 | } |
1377 | |
1378 | ldata = mknew(line_data); |
1379 | |
1380 | ldata->pdata = pdata; |
1381 | ldata->first = lhead; |
1382 | ldata->end = NULL; |
1383 | ldata->line_height = font_size * 4096; |
1384 | |
1385 | ldata->xpos = indent; |
1386 | |
1387 | if (pdata->last) { |
1388 | pdata->last->next = ldata; |
1389 | ldata->prev = pdata->last; |
1390 | } else { |
1391 | pdata->first = ldata; |
1392 | ldata->prev = NULL; |
1393 | } |
1394 | ldata->next = NULL; |
1395 | pdata->last = ldata; |
1396 | |
1397 | ldata->hshortfall = 0; |
1398 | ldata->nspaces = 0; |
1399 | ldata->aux_text = NULL; |
1400 | ldata->aux_text_2 = NULL; |
1401 | ldata->aux_left_indent = 0; |
39a0cfb9 |
1402 | /* General opprobrium for breaking in a code paragraph. */ |
1403 | ldata->penalty_before = ldata->penalty_after = 50000; |
515d216b |
1404 | } |
1405 | } |
87bd6353 |
1406 | |
1407 | static void rule_paragraph(para_data *pdata, int indent, int height) |
1408 | { |
1409 | line_data *ldata; |
1410 | |
1411 | ldata = mknew(line_data); |
1412 | |
1413 | ldata->pdata = pdata; |
1414 | ldata->first = NULL; |
1415 | ldata->end = NULL; |
1416 | ldata->line_height = height; |
1417 | |
1418 | ldata->xpos = indent; |
1419 | |
1420 | ldata->prev = NULL; |
1421 | ldata->next = NULL; |
1422 | |
1423 | ldata->hshortfall = 0; |
1424 | ldata->nspaces = 0; |
1425 | ldata->aux_text = NULL; |
1426 | ldata->aux_text_2 = NULL; |
1427 | ldata->aux_left_indent = 0; |
1428 | |
1429 | /* |
1430 | * Better to break after a rule than before it |
1431 | */ |
1432 | ldata->penalty_after += 100000; |
1433 | ldata->penalty_before += -100000; |
1434 | |
1435 | pdata->first = pdata->last = ldata; |
1436 | } |