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/*
* Copyright (C) 2007 - 2008 Lars Kuhtz, ExactCODE GmbH Germany.
* Copyright (C) 2010 René Rebe, ExactCODE GmbH Germany.
*
* This program 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; version 2. A copy of the GNU General
* Public License can be found in the file LICENSE.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANT-
* ABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
* Public License for more details.
*
* Alternatively, commercial licensing options are available from the
* copyright holder ExactCODE GmbH Germany.
*/
#include "scanner_utils.hh"
#include "code128.hh"
#include "code25i.hh"
#include "code39.hh"
#include "ean.hh"
namespace BarDecode
{
namespace
{
ean_t ean_impl;
code128_t code128_impl;
code39_t code39_impl;
code25i_t code25i_impl;
};
// TODO make all tables static (would be nice to have something like designated initializers
// like in C99 in C++ as well...) We do not have. Hence we need to work around.
// possibly by encapsulating the tables into objects with constructors that
// perform the initialization.
template<bool v>
void BarcodeIterator<v>::next()
{
assert( ! end());
pos_t& vx = v ? y : x;
pos_t& vy = v ? x : y;
while (! end() ) {
if (ti == te) {
vx = 0;
vy = v ? tokenizer.get_x() : tokenizer.get_y();
tokenizer.next_line(token_line);
ti = token_line.begin();
te = token_line.end();
}
// goto next white space of psize >= min_quiet_psize, that is followed by black
if ( ti+1 == te ) { ++ti; continue; }
token_t t = *ti;
token_t lookahead = *(ti+1);
while ((! lookahead.first || t.first || t.second < min_quiet_psize) && (++ti + 1 != te) ) { // while black ...
vx += t.second;
t = lookahead;
lookahead = *(ti+1);
}
if ( ti+1 == te ) { ++ti; continue; }
assert(! t.first); // assert white
/* ***************************** */
// preliminary checks
// each (non empty) Barcode has at least 24 modules (including both quiet zones)!
if (te - ti < 24) { ti = te; continue; }
psize_t quiet_psize = t.second;
// check quiet_zone against minimal requirement from all code types
if (lookahead.second * 3 > quiet_psize) { vx += t.second; ++ti; continue;}
// not enough space left on line for minimal barcode width:
//if (lookahead.second/3.0 * 14 + tokenizer.get_x() >= tokenizer.get_img()->w) continue;
/* ***************************** */
token_line_t::const_iterator backup_i = ti;
scanner_result_t result;
// try scanning for all requested barcode types
if (directions&left_right && requested(code39)) {
if ((result = code39_impl.scan(ti,te,x+ti->second,y,quiet_psize))) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&right_left && requested(code39)) {
ti = backup_i;
if ((result = code39_impl.reverse_scan(ti,te,x+ti->second,y,quiet_psize))) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&left_right && requested(code25i)) {
ti = backup_i;
if ((result = code25i_impl.scan(ti,te,x+ti->second,y,quiet_psize))) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&right_left && requested(code25i)) {
ti = backup_i;
if ((result = code25i_impl.reverse_scan(ti,te,x+ti->second,y,quiet_psize))) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&left_right && requested(code128)) {
ti = backup_i;
if (result = code128_impl.scan(ti,te,x+ti->second,y,quiet_psize)) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&right_left && requested(code128)) {
ti = backup_i;
if (result = code128_impl.reverse_scan(ti,te,x+ti->second,y,quiet_psize)) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
if ( directions&(left_right|right_left) && requested(ean) ) {
ti = backup_i;
if ((result = ean_impl.scan(ti,te,x+ti->second,y,quiet_psize,directions)) ) {
cur_barcode = result;
vx += pixel_diff(backup_i,ti);
return;
}
}
vx += backup_i->second;
ti = ++backup_i;
}
}
}; // namespace BarDecode
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