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% pdfxform.w
%
% Copyright 2009-2011 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
#include "ptexlib.h"
#include "pdf/pdfpage.h"
@ @c
int pdf_cur_form; /* the form being output */
void pdf_place_form(PDF pdf, halfword p)
{
scaled_whd nat, tex;
scaled x, y;
pdffloat cm[6];
pdfstructure *q = pdf->pstruct;
int r = 6;
int objnum = rule_index(p);
nat.wd = obj_xform_width(pdf, objnum);
nat.ht = obj_xform_height(pdf, objnum);
nat.dp = obj_xform_depth(pdf, objnum);
/* no transform yet */
tex.wd = width(p);
tex.ht = height(p);
tex.dp = depth(p);
if (nat.wd != tex.wd || nat.ht != tex.ht || nat.dp != tex.dp) {
x = ext_xn_over_d(ten_pow[r], tex.wd, nat.wd);
y = ext_xn_over_d(ten_pow[r], tex.dp + tex.ht, nat.dp + nat.ht);
} else
x = y = ten_pow[r];
setpdffloat(cm[0], x, r);
setpdffloat(cm[1], 0, r);
setpdffloat(cm[2], 0, r);
setpdffloat(cm[3], y, r);
pdf_goto_pagemode(pdf);
(void) calc_pdfpos(q, pdf->posstruct->pos);
cm[4] = q->cm[4];
cm[5] = q->cm[5];
pdf_puts(pdf, "q\n");
pdf_print_cm(pdf, cm);
pdf_printf(pdf, "/Fm%d", (int) obj_info(pdf, objnum));
pdf_print_resname_prefix(pdf);
pdf_puts(pdf, " Do\nQ\n");
addto_page_resources(pdf, obj_type_xform, objnum);
}
/* we will store token lists as strings too */
@ @c
void scan_pdfxform(PDF pdf)
{
int k;
halfword p;
pdf->xform_count++;
k = pdf_create_obj(pdf, obj_type_xform, pdf->xform_count);
set_obj_data_ptr(pdf, k, pdf_get_mem(pdf, pdfmem_xform_size));
if (scan_keyword("type")) {
scan_int();
set_obj_xform_type(pdf, k, cur_val);
} else {
set_obj_xform_type(pdf, k, 0);
}
if (scan_keyword("attr")) {
scan_toks(false, true);
set_obj_xform_attr(pdf, k, def_ref);
} else {
set_obj_xform_attr(pdf, k, null);
}
set_obj_xform_attr_str(pdf, k, null);
if (scan_keyword("resources")) {
scan_toks(false, true);
set_obj_xform_resources(pdf, k, def_ref);
} else {
set_obj_xform_resources(pdf, k, null);
}
if (scan_keyword("margin")) {
scan_int();
set_obj_xform_margin(pdf, k, cur_val);
} else {
set_obj_xform_margin(pdf, k, pdf_xform_margin);
}
set_obj_xform_resources_str(pdf, k, null);
scan_int();
p = box(cur_val);
if (p == null)
normal_error("pdf backend", "xforms cannot be used with a void box");
set_obj_xform_box(pdf, k, p); /* save pointer to the box */
set_obj_xform_width(pdf, k, width(p));
set_obj_xform_height(pdf, k, height(p));
set_obj_xform_depth(pdf, k, depth(p));
box(cur_val) = null;
last_saved_box_index = k;
}
@ @c
void scan_pdfrefxform(PDF pdf)
{
scaled_whd alt_rule, dim, nat;
alt_rule = scan_alt_rule(); /* scans |<rule spec>| to |alt_rule| */
scan_int();
check_obj_type(pdf, obj_type_xform, cur_val);
tail_append(new_rule(box_rule));
nat.wd = obj_xform_width(pdf, cur_val);
nat.ht = obj_xform_height(pdf, cur_val);
nat.dp = obj_xform_depth(pdf, cur_val);
if (alt_rule.wd != null_flag || alt_rule.ht != null_flag || alt_rule.dp != null_flag) {
dim = tex_scale(nat, alt_rule);
} else {
dim = nat;
}
width(tail_par) = dim.wd;
height(tail_par) = dim.ht;
depth(tail_par) = dim.dp;
rule_index(tail_par) = cur_val;
}
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