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/*
Copyright 2009-2012 Taco Hoekwater <taco@@luatex.org>
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 <http://www.gnu.org/licenses/>.
*/
#include "ptexlib.h"
/*tex
Threads are handled in similar way as link annotations.
*/
void append_bead(PDF pdf, halfword p)
{
int a, b, c, t;
if (global_shipping_mode == SHIPPING_FORM)
normal_error("pdf backend", "threads cannot be inside an xform");
t = pdf_get_obj(pdf, obj_type_thread, pdf_thread_id(p), pdf_thread_named_id(p));
b = pdf_create_obj(pdf, obj_type_others, 0);
obj_bead_ptr(pdf, b) = pdf_get_mem(pdf, pdfmem_bead_size);
set_obj_bead_page(pdf, b, pdf->last_page);
set_obj_bead_data(pdf, b, p);
if (pdf_thread_attr(p) != null)
set_obj_bead_attr(pdf, b, tokens_to_string(pdf_thread_attr(p)));
else
set_obj_bead_attr(pdf, b, 0);
if (obj_thread_first(pdf, t) == 0) {
obj_thread_first(pdf, t) = b;
set_obj_bead_next(pdf, b, b);
set_obj_bead_prev(pdf, b, b);
} else {
a = obj_thread_first(pdf, t);
c = obj_bead_prev(pdf, a);
set_obj_bead_prev(pdf, b, c);
set_obj_bead_next(pdf, b, a);
set_obj_bead_prev(pdf, a, b);
set_obj_bead_next(pdf, c, b);
}
addto_page_resources(pdf, obj_type_bead, b);
}
void do_thread(PDF pdf, halfword p, halfword parent_box, scaledpos cur)
{
scaled_whd alt_rule;
if ((type(p) == hlist_node) && (subtype(p) == pdf_start_thread_node))
normal_error("pdf backend", "'startthread' ended up in hlist");
if (doing_leaders)
return;
if (subtype(p) == pdf_start_thread_node) {
pdf->thread.wd = width(p);
pdf->thread.ht = height(p);
pdf->thread.dp = depth(p);
pdf->last_thread_id = pdf_thread_id(p);
pdf->last_thread_named_id = (pdf_thread_named_id(p) > 0);
if (pdf->last_thread_named_id)
add_token_ref(pdf_thread_id(p));
pdf->thread_level = cur_s;
}
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_thread_margin);
append_bead(pdf, p);
pdf->last_thread = p;
}
void append_thread(PDF pdf, halfword parent_box, scaledpos cur)
{
scaled_whd alt_rule;
halfword p = new_node(whatsit_node, pdf_thread_data_node);
width(p) = pdf->thread.wd;
height(p) = pdf->thread.ht;
depth(p) = pdf->thread.dp;
pdf_thread_attr(p) = null;
pdf_thread_id(p) = pdf->last_thread_id;
if (pdf->last_thread_named_id) {
add_token_ref(pdf_thread_id(p));
pdf_thread_named_id(p) = 1;
} else {
pdf_thread_named_id(p) = 0;
}
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_thread_margin);
append_bead(pdf, p);
pdf->last_thread = p;
}
void end_thread(PDF pdf, halfword p)
{
scaledpos pos = pdf->posstruct->pos;
if (type(p) == hlist_node)
normal_error("pdf backend", "'endthread' ended up in hlist");
if (pdf->thread_level != cur_s)
normal_error("pdf backend", "'endthread' ended up in different nesting level than 'startthread'");
if (is_running(pdf->thread.dp) && (pdf->last_thread != null)) {
switch (pdf->posstruct->dir) {
case dir_TLT:
case dir_TRT:
pdf_ann_bottom(pdf->last_thread) = pos.v - pdf_thread_margin;
break;
case dir_LTL:
pdf_ann_right(pdf->last_thread) = pos.h + pdf_thread_margin;
break;
case dir_RTT:
pdf_ann_left(pdf->last_thread) = pos.h - pdf_thread_margin;
break;
default:
formatted_warning("pdf backend","forcing bad dir %i to TLT in end tread",pdf->posstruct->dir);
}
}
if (pdf->last_thread_named_id)
delete_token_ref(pdf->last_thread_id);
pdf->last_thread = null;
}
/*tex The following function are needed for outputing article thread. */
void thread_title(PDF pdf, int t)
{
pdf_add_name(pdf, "Title");
pdf_out(pdf, '(');
if (obj_info(pdf, t) < 0)
pdf_print(pdf, -obj_info(pdf, t));
else
pdf_print_int(pdf, obj_info(pdf, t));
pdf_out(pdf, ')');
}
void pdf_fix_thread(PDF pdf, int t)
{
halfword a;
if (obj_info(pdf, t) < 0) {
char *ss = makecstring(-obj_info(pdf, t));
formatted_warning("pdf backend", "unknown thread destination name '%s'",ss);
} else {
formatted_warning("pdf backend", "unknown thread destination num '%d'",obj_info(pdf, t));
}
a = pdf_create_obj(pdf, obj_type_others, 0);
pdf_begin_obj(pdf, a, OBJSTM_ALWAYS);
pdf_begin_dict(pdf);
pdf_dict_add_ref(pdf, "T", t);
pdf_dict_add_ref(pdf, "V", a);
pdf_dict_add_ref(pdf, "N", a);
pdf_dict_add_ref(pdf, "P", pdf->last_page);
pdf_add_name(pdf, "R");
pdf_begin_array(pdf);
pdf_add_int(pdf, 0);
pdf_add_int(pdf, 0);
pdf_add_bp(pdf, page_width_par);
pdf_add_bp(pdf, page_height_par);
pdf_end_array(pdf);
pdf_end_dict(pdf);
pdf_end_obj(pdf);
pdf_begin_obj(pdf, t, OBJSTM_ALWAYS);
pdf_begin_dict(pdf);
pdf_add_name(pdf, "I");
pdf_begin_dict(pdf);
thread_title(pdf, t);
pdf_end_dict(pdf);
pdf_dict_add_ref(pdf, "F", a);
pdf_end_dict(pdf);
pdf_end_obj(pdf);
}
void out_thread(PDF pdf, int t)
{
halfword a, b;
int last_attr;
if (obj_thread_first(pdf, t) == 0) {
pdf_fix_thread(pdf, t);
return;
}
pdf_begin_obj(pdf, t, OBJSTM_ALWAYS);
pdf_begin_dict(pdf);
a = obj_thread_first(pdf, t);
b = a;
last_attr = 0;
do {
if (obj_bead_attr(pdf, a) != 0)
last_attr = obj_bead_attr(pdf, a);
a = obj_bead_next(pdf, a);
} while (a != b);
if (last_attr != 0) {
pdf_print_ln(pdf, last_attr);
} else {
pdf_add_name(pdf, "I");
pdf_begin_dict(pdf);
thread_title(pdf, t);
pdf_end_dict(pdf);
}
pdf_dict_add_ref(pdf, "F", a);
pdf_end_dict(pdf);
pdf_end_obj(pdf);
do {
pdf_begin_obj(pdf, a, OBJSTM_ALWAYS);
pdf_begin_dict(pdf);
if (a == b)
pdf_dict_add_ref(pdf, "T", t);
pdf_dict_add_ref(pdf, "V", obj_bead_prev(pdf, a));
pdf_dict_add_ref(pdf, "N", obj_bead_next(pdf, a));
pdf_dict_add_ref(pdf, "P", obj_bead_page(pdf, a));
pdf_dict_add_ref(pdf, "R", obj_bead_rect(pdf, a));
pdf_end_dict(pdf);
pdf_end_obj(pdf);
a = obj_bead_next(pdf, a);
} while (a != b);
}
void scan_thread_id(void)
{
if (scan_keyword("num")) {
scan_int();
if (cur_val <= 0)
normal_error("pdf backend", "num identifier must be positive");
if (cur_val > max_halfword)
normal_error("pdf backend", "number too big");
set_pdf_thread_id(cur_list.tail_field, cur_val);
set_pdf_thread_named_id(cur_list.tail_field, 0);
} else if (scan_keyword("name")) {
scan_toks(false, true);
set_pdf_thread_id(cur_list.tail_field, def_ref);
set_pdf_thread_named_id(cur_list.tail_field, 1);
} else {
normal_error("pdf backend", "identifier type missing");
}
}
void check_running_thread(PDF pdf, halfword this_box, scaledpos cur)
{
if ((pdf->last_thread != null) && is_running(pdf->thread.dp)
&& (pdf->thread_level == cur_s))
append_thread(pdf, this_box, cur);
}
void print_bead_rectangles(PDF pdf)
{
halfword i;
pdf_object_list *k;
int l;
if ((k = get_page_resources_list(pdf, obj_type_bead)) != NULL) {
while (k != NULL) {
l = pdf_create_obj(pdf, obj_type_others, 0);
pdf_begin_obj(pdf, l, OBJSTM_ALWAYS);
pdf_begin_array(pdf);
/*tex A pointer to a whatsit or whatsit-like node: */
i = obj_bead_data(pdf, k->info);
pdf_add_rect_spec(pdf, i);
if (subtype(i) == pdf_thread_data_node)
flush_node(i);
pdf_end_array(pdf);
pdf_end_obj(pdf);
/*tex Rewrite |obj_bead_data|: */
set_obj_bead_rect(pdf, k->info, l);
k = k->link;
}
}
}
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