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% pdfsaverestore.w
%
% Copyright 2010 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/>.
@ @c
static const char _svn_version[] =
"$Id: pdfsaverestore.w 3571 2010-04-02 13:50:45Z taco $ "
"$URL: http://foundry.supelec.fr/svn/luatex/tags/beta-0.60.0/source/texk/web2c/luatexdir/pdf/pdfsaverestore.w $";
#include "ptexlib.h"
@ @c
pos_entry *pos_stack = 0; /* the stack */
int pos_stack_size = 0; /* initially empty */
int pos_stack_used = 0; /* used entries */
@ @c
static void checkpdfsave(scaledpos pos)
{
pos_entry *new_stack;
if (pos_stack_used >= pos_stack_size) {
pos_stack_size += STACK_INCREMENT;
new_stack = xtalloc((unsigned) pos_stack_size, pos_entry);
memcpy((void *) new_stack, (void *) pos_stack,
(unsigned) pos_stack_used * sizeof(pos_entry));
xfree(pos_stack);
pos_stack = new_stack;
}
pos_stack[pos_stack_used].pos.h = pos.h;
pos_stack[pos_stack_used].pos.v = pos.v;
if (page_mode) {
pos_stack[pos_stack_used].matrix_stack = matrix_stack_used;
}
pos_stack_used++;
}
@ @c
static void checkpdfrestore(scaledpos pos)
{
scaledpos diff;
if (pos_stack_used == 0) {
pdftex_warn("%s", "\\pdfrestore: missing \\pdfsave");
return;
}
pos_stack_used--;
diff.h = pos.h - pos_stack[pos_stack_used].pos.h;
diff.v = pos.v - pos_stack[pos_stack_used].pos.v;
if (diff.h != 0 || diff.v != 0) {
pdftex_warn("Misplaced \\pdfrestore by (%dsp, %dsp)", (int) diff.h,
(int) diff.v);
}
if (page_mode) {
matrix_stack_used = pos_stack[pos_stack_used].matrix_stack;
}
}
@ @c
void pdf_out_save(PDF pdf, halfword p)
{
(void) p;
checkpdfsave(pdf->posstruct->pos);
pdf_literal(pdf, 'q', set_origin, false);
}
@ @c
void pdf_out_restore(PDF pdf, halfword p)
{
(void) p;
checkpdfrestore(pdf->posstruct->pos);
pdf_literal(pdf, 'Q', set_origin, false);
}
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