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+/* pdfthread.h
+
+ Copyright 2009 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/>. */
+
+/* $Id: pdfthread.h 3261 2009-12-18 11:38:21Z taco $ */
+
+#ifndef PDFTHREAD_H
+# define PDFTHREADH
+
+/* data structure of threads; words 1..4 represent the coordinates of the corners */
+
+# define obj_thread_first obj_aux /* pointer to the first bead */
+
+/* data structure of beads */
+# define pdfmem_bead_size 5 /* size of memory in |pdf->mem| which |obj_bead_ptr| points to */
+
+# define set_pdf_thread_attr(A,B) pdf_thread_attr(A)=B
+# define set_pdf_thread_id(A,B) pdf_thread_id(A)=B
+# define set_pdf_thread_named_id(A,B) pdf_thread_named_id(A)=B
+
+# define obj_bead_ptr obj_aux /* pointer to |pdf->mem| */
+# define obj_bead_rect(pdf,A) pdf->mem[obj_bead_ptr(pdf,A)]
+# define obj_bead_page(pdf,A) pdf->mem[obj_bead_ptr(pdf,A) + 1]
+# define obj_bead_next(pdf,A) pdf->mem[obj_bead_ptr(pdf,A) + 2]
+# define obj_bead_prev(pdf,A) pdf->mem[obj_bead_ptr(pdf,A) + 3]
+# define obj_bead_attr(pdf,A) pdf->mem[obj_bead_ptr(pdf,A) + 4]
+
+# define set_obj_bead_rect(pdf,A,B) obj_bead_rect(pdf,A)=B
+# define set_obj_bead_page(pdf,A,B) obj_bead_page(pdf,A)=B
+# define set_obj_bead_next(pdf,A,B) obj_bead_next(pdf,A)=B
+# define set_obj_bead_prev(pdf,A,B) obj_bead_prev(pdf,A)=B
+# define set_obj_bead_attr(pdf,A,B) obj_bead_attr(pdf,A)=B
+
+
+/* pointer to the corresponding whatsit node; |obj_bead_rect| is needed only when the bead
+ rectangle has been written out and after that |obj_bead_data| is not needed any more
+ so we can use this field for both */
+# define obj_bead_data obj_bead_rect
+# define set_obj_bead_data set_obj_bead_rect
+
+extern void append_bead(PDF pdf, halfword p);
+extern void do_thread(PDF pdf, halfword parent_box, halfword p, scaledpos cur);
+extern void append_thread(PDF pdf, halfword parent_box, scaledpos cur);
+extern void end_thread(PDF pdf, halfword p);
+extern void scan_thread_id(void);
+
+extern void thread_title(PDF pdf, int t);
+extern void pdf_fix_thread(PDF pdf, int t);
+extern void out_thread(PDF pdf, int t);
+
+extern void check_running_thread(PDF pdf, halfword this_box, scaledpos cur);
+extern void print_beads_list(PDF pdf);
+extern void print_bead_rectangles(PDF pdf);
+extern void flush_beads_list(void);
+
+#endif