/* Copyright 2009-2012 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 To implement nested link annotations, we need a stack to hold copy of |pdf_start_link_node|'s that are being written out, together with their box nesting level. */ void pdf_out_link_state(PDF pdf, halfword p) { if (pdf_link_state(p) >= 0 && pdf_link_state(p) <= 1) { pdf->link_state = pdf_link_state(p); } else { /* ignores so one can use them for whatever purpose */ } } void push_link_level(PDF pdf, halfword p) { if (pdf->link_stack_ptr >= pdf_max_link_level) overflow("pdf link stack size", pdf_max_link_level); pdf->link_stack_ptr++; pdf->link_stack[pdf->link_stack_ptr].nesting_level = cur_s; pdf->link_stack[pdf->link_stack_ptr].link_node = copy_node_list(p); pdf->link_stack[pdf->link_stack_ptr].ref_link_node = p; } void pop_link_level(PDF pdf) { flush_node_list(pdf->link_stack[pdf->link_stack_ptr].link_node); pdf->link_stack_ptr--; } void do_link(PDF pdf, halfword p, halfword parent_box, scaledpos cur) { scaled_whd alt_rule; int k; if (type(p) == vlist_node) normal_error("pdf backend", "'startlink' ended up in vlist"); if (global_shipping_mode == SHIPPING_FORM) normal_error("pdf backend", "link annotations cannot be inside an xform"); if (is_obj_scheduled(pdf, pdf_link_objnum(p))) pdf_link_objnum(p) = pdf_create_obj(pdf, obj_type_others, 0); push_link_level(pdf, p); alt_rule.wd = width(p); alt_rule.ht = height(p); alt_rule.dp = depth(p); set_rect_dimens(pdf, p, parent_box, cur, alt_rule, pdf_link_margin); /*tex The reference for the annot object must be set here. */ obj_annot_ptr(pdf, pdf_link_objnum(p)) = p; k = pdf_link_objnum(p); set_obj_scheduled(pdf, pdf_link_objnum(p)); addto_page_resources(pdf, obj_type_link, k); } void end_link(PDF pdf, halfword p) { halfword q; scaledpos pos = pdf->posstruct->pos; if (type(p) == vlist_node) normal_error("pdf backend","'endlink' ended up in vlist"); if (pdf->link_stack_ptr < 1) normal_error("pdf backend","pdf link_stack empty, 'endlink' used without 'startlink'"); if (pdf->link_stack[pdf->link_stack_ptr].nesting_level != cur_s) normal_error("pdf backend","'endlink' ended up in different nesting level than 'startlink'"); /*tex The test for running link must be done on |link_node| and not |ref_link_node|, as |ref_link_node| can be set by |do_link| or |append_link| already. */ if (is_running(width(pdf->link_stack[pdf->link_stack_ptr].link_node))) { q = pdf->link_stack[pdf->link_stack_ptr].ref_link_node; if (global_shipping_mode == SHIPPING_PAGE && matrixused()) { matrixrecalculate(pos.h + pdf_link_margin); pdf_ann_left(q) = getllx() - pdf_link_margin; pdf_ann_top(q) = getlly() - pdf_link_margin; pdf_ann_right(q) = geturx() + pdf_link_margin; pdf_ann_bottom(q) = getury() + pdf_link_margin; } else { switch (pdf->posstruct->dir) { case dir_TLT: pdf_ann_right(q) = pos.h + pdf_link_margin; break; case dir_TRT: /*tex In version 1.13.0 the test for swapping was moved to the moment we write the rectangle, but it did not consider this case. */ if (pdf_ann_left(q)posstruct->dir); } } } pop_link_level(pdf); } /*tex For ``running'' annotations we must append a new node when the end of annotation is in other box than its start. The new created node is identical to corresponding whatsit node representing the start of annotation, but its |info| field is |max_halfword|. We set |info| field just before destroying the node, in order to use |flush_node_list| to do the job. */ void append_link(PDF pdf, halfword parent_box, scaledpos cur, small_number i) { halfword p; int k; scaled_whd alt_rule; p = copy_node(pdf->link_stack[(int) i].link_node); pdf->link_stack[(int) i].ref_link_node = p; /*tex This node is not a normal link node. */ subtype(p) = pdf_link_data_node; alt_rule.wd = width(p); alt_rule.ht = height(p); alt_rule.dp = depth(p); set_rect_dimens(pdf, p, parent_box, cur, alt_rule, pdf_link_margin); k = pdf_create_obj(pdf, obj_type_others, 0); obj_annot_ptr(pdf, k) = p; set_obj_scheduled(pdf, pdf_link_objnum(p)); addto_page_resources(pdf, obj_type_link, k); } void scan_startlink(PDF pdf) { int k; halfword r; if (abs(cur_list.mode_field) == vmode) normal_error("pdf backend", "startlink cannot be used in vertical mode"); k = pdf_create_obj(pdf, obj_type_others, 0); new_annot_whatsit(pdf_start_link_node); set_pdf_link_attr(cur_list.tail_field, null); if (scan_keyword("attr")) { scan_toks(false, true); set_pdf_link_attr(cur_list.tail_field, def_ref); } r = scan_action(pdf); set_pdf_link_action(cur_list.tail_field, r); set_pdf_link_objnum(cur_list.tail_field, k); pdf_last_link = k; /*tex Although it is possible to set |obj_annot_ptr(k) := tail| here, it is not safe if nodes are later copied/destroyed/moved; a better place to do this is inside |do_link|, when the whatsit node is written out. */ }