/* Copyright 2009-2014 Taco Hoekwater This file is part of LuaTeX. LuaTeX is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. LuaTeX is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU General Public License along with LuaTeX; if not, see . */ #include "ptexlib.h" /*tex As \LUATEX\ should also act as a back-end driver, it needs to support virtual fonts too. Information about virtual fonts can be found in the source of some \DVI-related programs. Whenever we want to write out a character in a font to \PDF\ output, we should check whether the used character is a virtual or real character. The |has_packet| C macro checks for this condition. The following code typesets a character to \PDF\ output */ scaled_whd output_one_char(PDF pdf, halfword p) { internal_font_number f = font(p); int c = character(p); int ex_glyph = ex_glyph(p)/1000; /*tex The real width, height and depth of the character: */ scaled_whd ci = get_charinfo_whd(f, c); if (!(char_exists(f,c))) { lua_glyph_not_found_callback(f,c); /*tex Not here |char_warning(f,c);| */ return ci; } ci.wd = ext_xn_over_d(ci.wd, 1000000 + ex_glyph(p), 1000000); switch (pdf->posstruct->dir) { case dir_TLT: break; case dir_TRT: pos_left(ci.wd); break; case dir_LTL: pos_down(ci.ht); pos_left(ci.wd); break; case dir_RTT: pos_down(ci.ht); pos_left(ci.wd / 2); break; default: formatted_warning("pdf backend","ignoring bad dir %i when outputting a character",pdf->posstruct->dir); } if (has_packet(f, c)) { do_vf_packet(pdf, f, c, ex_glyph); } else { backend_out[glyph_node] (pdf, f, c, ex_glyph); } return ci; } /*tex Mark |f| as a used font; set |font_used(f)|, |font_size(f)| and |pdf_font_num(f)|. */ static void pdf_use_font(internal_font_number f, int fontnum) { set_font_used(f, true); if ((fontnum > 0) || ((fontnum < 0) && (pdf_font_num(-fontnum) > 0))) { set_pdf_font_num(f, fontnum); } else { normal_error("pdf backend","bad font id"); } } /*tex To set PDF font we need to find out fonts with the same name, because \TeX\ can load the same font several times for various sizes. For such fonts we define only one font resource. The array |pdf_font_num| holds the object number of font resource. A negative value of an entry of |pdf_font_num| indicates that the corresponding font shares the font resource with the font. */ #define same(n,f,k) (n(f) != NULL && n(k) != NULL && strcmp(n(f), n(k)) == 0) /*tex For some \LUA-loaded (for instance \AFM) fonts, it is normal to have a zero cidregistry, and such fonts do not have a fontmap entry yet at this point, so the test should use the other branch. */ static boolean font_shareable(internal_font_number f, internal_font_number k) { if (font_cidregistry(f) == NULL && font_cidregistry(k) == NULL && font_encodingbytes(f) != 2 && font_encodingbytes(k) != 2) { if (font_map(k) != NULL && font_map(f) != NULL && (same(font_name, k, f))) { return 1; } } else if ((same(font_filename, k, f) && same(font_fullname, k, f))) { return 1; } return 0; } /*tex We will create a font object. We check whether |f| can share the font object with some |k|: we have 2 cases here: |f| and |k| have the same tfm name, so they have been loaded at different sizes, eg 'cmr10' and 'cmr10 at 11pt'. We optionally take over slant and extend from map entry, if not already set; this should also be the only place where getfontmap() may be called. Beware, \LUATEX\ is different from \PDFTEX\ in dealing with expanded and slanted fonts and expansion and protrusion as it will use the same font but a different transformation which is way more efficient and also cleaner. */ void pdf_init_font(PDF pdf, internal_font_number f) { internal_font_number k; fm_entry *fm; int i, l; if (font_used(f)) { formatted_error("pdf backend","font %i gets initialized twice",(int) f); } fm = getfontmap(font_name(f)); if (font_map(f) == NULL && fm != NULL) { font_map(f) = fm; if (is_slantset(fm)) font_slant(f) = fm->slant; if (is_extendset(fm)) font_extend(f) = fm->extend; } i = pdf->head_tab[obj_type_font]; while (i != 0) { k = obj_info(pdf, i); if (font_shareable(f, k)) { if (pdf_font_num(k) < 0) pdf_use_font(f, pdf_font_num(k)); else pdf_use_font(f, -k); return; } i = obj_link(pdf, i); } /*tex Create a new font object for |f|: */ l = pdf_create_obj(pdf, obj_type_font, f); pdf_use_font(f, l); } /*tex Set the actual font on PDF page; sets |ff| to the tfm number of the base font sharing the font object with |f|; |ff| is either |f| itself (then it is its own base font), or some font with the same tfm name at different size and/or expansion. */ internal_font_number pdf_set_font(PDF pdf, internal_font_number f) { /*tex For use with |set_ff|: */ int ff; if (!font_used(f)) pdf_init_font(pdf, f); /*tex Also known as |set_ff(f)|: */ ff = pdf_font_num(f) < 0 ? -pdf_font_num(f) : f; addto_page_resources(pdf, obj_type_font, pdf_font_num(ff)); return ff; } void pdf_include_chars(PDF pdf) { str_number s; unsigned char *k, *j; internal_font_number f; scan_font_ident(); f = cur_val; if (f == null_font) normal_error("pdf backend", "invalid font identifier for 'includechars'"); /* pdf_check_vf(c); */ if (!font_used(f)) pdf_init_font(pdf, f); scan_toks(false, true); s = tokens_to_string(def_ref); delete_token_ref(def_ref); j = str_string(s) + str_length(s); for (k = str_string(s); k < j; k++) { pdf_mark_char(f, *k); } flush_str(s); }