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