X-Git-Url: https://git.distorted.org.uk/~mdw/sgt/halibut/blobdiff_plain/09358aa7f255d1cd8d47dd152c480d4818cb24cf..7c570bf386b055563f689fb3c424af29227db8e6:/bk_pdf.c diff --git a/bk_pdf.c b/bk_pdf.c index fe10894..6aba554 100644 --- a/bk_pdf.c +++ b/bk_pdf.c @@ -10,30 +10,7 @@ paragraph *pdf_config_filename(char *filename) { - paragraph *p; - wchar_t *ufilename, *up; - int len; - - p = mknew(paragraph); - memset(p, 0, sizeof(*p)); - p->type = para_Config; - p->next = NULL; - p->fpos.filename = ""; - p->fpos.line = p->fpos.col = -1; - - ufilename = ufroma_dup(filename); - len = ustrlen(ufilename) + 2 + lenof(L"pdf-filename"); - p->keyword = mknewa(wchar_t, len); - up = p->keyword; - ustrcpy(up, L"pdf-filename"); - up = uadv(up); - ustrcpy(up, ufilename); - up = uadv(up); - *up = L'\0'; - assert(up - p->keyword < len); - sfree(ufilename); - - return p; + return cmdline_cfg_simple("pdf-filename", filename, NULL); } typedef struct object_Tag object; @@ -56,6 +33,10 @@ struct objlist_Tag { static object *new_object(objlist *list); static void objtext(object *o, char const *text); static void objstream(object *o, char const *text); +static void pdf_string(void (*add)(object *, char const *), + object *, char const *); +static void pdf_string_len(void (*add)(object *, char const *), + object *, char const *, int); static void objref(object *o, object *dest); static void make_pages_node(object *node, object *parent, page_data *first, @@ -86,7 +67,7 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, if (p->type == para_Config && p->parent) { if (!ustricmp(p->keyword, L"pdf-filename")) { sfree(filename); - filename = utoa_dup(uadv(p->keyword)); + filename = dupstr(adv(p->origkeyword)); } } } @@ -95,7 +76,10 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, olist.number = 1; cat = new_object(&olist); - outlines = new_object(&olist); + if (doc->n_outline_elements > 0) + outlines = new_object(&olist); + else + outlines = NULL; pages = new_object(&olist); resources = new_object(&olist); @@ -103,11 +87,16 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, * The catalogue just contains references to the outlines and * pages objects. */ - objtext(cat, "<<\n/Type /Catalog\n/Outlines "); - objref(cat, outlines); + objtext(cat, "<<\n/Type /Catalog"); + if (outlines) { + objtext(cat, "\n/Outlines "); + objref(cat, outlines); + } objtext(cat, "\n/Pages "); objref(cat, pages); - objtext(cat, "\n/PageMode /UseOutlines\n>>\n"); + if (outlines) + objtext(cat, "\n/PageMode /UseOutlines"); + objtext(cat, "\n>>\n"); /* * Set up the resources dictionary, which mostly means @@ -195,8 +184,9 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, for (page = doc->pages; page; page = page->next) { object *opage, *cstr; rect *r; - text_fragment *frag; + text_fragment *frag, *frag_end; char buf[256]; + int x, y, lx, ly; opage = (object *)page->spare; /* @@ -236,24 +226,89 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, } objstream(cstr, "BT\n"); - for (frag = page->first_text; frag; frag = frag->next) { - char *c; + /* + * PDF tracks two separate current positions: the position + * given in the `line matrix' and the position given in the + * `text matrix'. We must therefore track both as well. + * They start off at -1 (unset). + */ + lx = ly = -1; + x = y = -1; + + frag = page->first_text; + while (frag) { + /* + * For compactness, I'm going to group text fragments + * into subsequences that use the same font+size. So + * first find the end of this subsequence. + */ + for (frag_end = frag; + (frag_end && + frag_end->fe == frag->fe && + frag_end->fontsize == frag->fontsize); + frag_end = frag_end->next); + + /* + * Now select the text fragment, and prepare to display + * the text. + */ objstream(cstr, "/"); objstream(cstr, frag->fe->name); - sprintf(buf, " %d Tf 1 0 0 1 %g %g Tm (", frag->fontsize, - frag->x/4096.0, frag->y/4096.0); + sprintf(buf, " %d Tf ", frag->fontsize); objstream(cstr, buf); - for (c = frag->text; *c; c++) { - if (*c == '(' || *c == ')' || *c == '\\') - objstream(cstr, "\\"); - buf[0] = *c; - buf[1] = '\0'; + while (frag && frag != frag_end) { + /* + * Place the text position for the first piece of + * text. + */ + if (lx < 0) { + sprintf(buf, "1 0 0 1 %g %g Tm ", + frag->x/4096.0, frag->y/4096.0); + } else { + sprintf(buf, "%g %g Td ", + (frag->x - lx)/4096.0, (frag->y - ly)/4096.0); + } objstream(cstr, buf); + lx = x = frag->x; + ly = y = frag->y; + + /* + * See if we're going to use Tj (show a single + * string) or TJ (show an array of strings with + * x-spacings between them). We determine this by + * seeing if there's more than one text fragment in + * sequence with the same y-coordinate. + */ + if (frag->next && frag->next != frag_end && + frag->next->y == y) { + /* + * The TJ strategy. + */ + objstream(cstr, "["); + while (frag && frag != frag_end && frag->y == y) { + if (frag->x != x) { + sprintf(buf, "%g", + (x - frag->x) * 1000.0 / + (4096.0 * frag->fontsize)); + objstream(cstr, buf); + } + pdf_string(objstream, cstr, frag->text); + x = frag->x + frag->width; + frag = frag->next; + } + objstream(cstr, "]TJ\n"); + } else + { + /* + * The Tj strategy. + */ + pdf_string(objstream, cstr, frag->text); + objstream(cstr, "Tj\n"); + frag = frag->next; + } } - - objstream(cstr, ") Tj\n"); } objstream(cstr, "ET"); @@ -285,18 +340,9 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, objref(annot, (object *)xr->dest.page->spare); objtext(annot, " /XYZ null null null]\n"); } else { - char *p; - - objtext(annot, "/A <<\n/Type /Action\n/S /URI\n/URI ("); - for (p = xr->dest.url; *p; p++) { - char c[2]; - c[0] = *p; - c[1] = '\0'; - if (*p == '(' || *p == ')' || *p == '\\') - objtext(annot, "\\"); - objtext(annot, c); - } - objtext(annot, ")\n>>\n"); + objtext(annot, "/A <<\n/Type /Action\n/S /URI\n/URI "); + pdf_string(objtext, annot, xr->dest.url); + objtext(annot, "\n>>\n"); } objtext(annot, ">>\n"); @@ -311,7 +357,7 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, /* * Set up the outlines dictionary. */ - { + if (outlines) { int topcount; char buf[80]; @@ -418,7 +464,7 @@ void pdf_backend(paragraph *sourceform, keywordlist *keywords, static object *new_object(objlist *list) { - object *obj = mknew(object); + object *obj = snew(object); obj->list = list; @@ -544,44 +590,32 @@ static void make_pages_node(object *node, object *parent, page_data *first, * means that glyphs are identified by PS strings and hence font * encoding can be managed independently of the supplied encoding * of the font. However, in the document outline, the PDF spec - * simply asks for ordinary text strings without mentioning what - * character set they are supposed to be interpreted in. - * - * Therefore, for the moment, I'm going to assume they're US-ASCII - * only. If anyone knows better, they should let me know :-/ + * encodes in either PDFDocEncoding (a custom superset of + * ISO-8859-1) or UTF-16BE. */ -static int pdf_convert(wchar_t *s, char **result) { - int doing = (result != 0); - int ok = TRUE; - char *p = NULL; - int plen = 0, psize = 0; - - for (; *s; s++) { - wchar_t c = *s; - char outc; - - if (c >= 32 && c <= 126) { - /* Char is OK. */ - outc = (char)c; - } else { - /* Char is not OK. */ - ok = FALSE; - outc = 0xBF; /* approximate the good old DEC `uh?' */ - } - if (doing) { - if (plen >= psize) { - psize = plen + 256; - p = resize(p, psize); - } - p[plen++] = outc; - } +static char *pdf_outline_convert(wchar_t *s, int *len) { + char *ret; + + ret = utoa_careful_dup(s, CS_PDF); + + /* + * Very silly special case: if the returned string begins with + * FE FF, then the PDF reader will mistake it for a UTF-16BE + * string. So in this case we give up on PDFDocEncoding and + * encode it in UTF-16 straight away. + */ + if (ret && ret[0] == '\xFE' && ret[1] == '\xFF') { + sfree(ret); + ret = NULL; } - if (doing) { - p = resize(p, plen+1); - p[plen] = '\0'; - *result = p; + + if (!ret) { + ret = utoa_dup_len(s, CS_UTF16BE, len); + } else { + *len = strlen(ret); } - return ok; + + return ret; } static int make_outline(object *parent, outline_element *items, int n, @@ -596,7 +630,8 @@ static int make_outline(object *parent, outline_element *items, int n, level = items->level; while (n > 0) { - char *title, *p; + char *title; + int titlelen; /* * Here we expect to be sitting on an item at the given @@ -605,22 +640,15 @@ static int make_outline(object *parent, outline_element *items, int n, */ assert(items->level == level); - pdf_convert(items->pdata->outline_title, &title); + title = pdf_outline_convert(items->pdata->outline_title, &titlelen); totalcount++; curr = new_object(parent->list); if (!first) first = curr; last = curr; - objtext(curr, "<<\n/Title ("); - for (p = title; *p; p++) { - char c[2]; - if (*p == '\\' || *p == '(' || *p == ')') - objtext(curr, "\\"); - c[0] = *p; - c[1] = '\0'; - objtext(curr, c); - } - objtext(curr, ")\n/Parent "); + objtext(curr, "<<\n/Title "); + pdf_string_len(objtext, curr, title, titlelen); + objtext(curr, "\n/Parent "); objref(curr, parent); objtext(curr, "\n/Dest ["); objref(curr, (object *)items->pdata->first->page->spare); @@ -690,7 +718,7 @@ static int pdf_versionid(FILE *fp, word *words) switch (type) { case word_Normal: - text = utoa_dup(words->text); + text = utoa_dup(words->text, CS_ASCII); break; case word_WhiteSpace: text = dupstr(" "); @@ -709,3 +737,31 @@ static int pdf_versionid(FILE *fp, word *words) return ret; } + +static void pdf_string_len(void (*add)(object *, char const *), + object *o, char const *str, int len) +{ + char const *p; + + add(o, "("); + for (p = str; len > 0; p++, len--) { + char c[10]; + if (*p < ' ' || *p > '~') { + sprintf(c, "\\%03o", 0xFF & (int)*p); + } else { + int n = 0; + if (*p == '\\' || *p == '(' || *p == ')') + c[n++] = '\\'; + c[n++] = *p; + c[n] = '\0'; + } + add(o, c); + } + add(o, ")"); +} + +static void pdf_string(void (*add)(object *, char const *), + object *o, char const *str) +{ + pdf_string_len(add, o, str, strlen(str)); +}