/usr/include/gamera/plugins/arithmetic.hpp is in python-gamera-dev 1:3.4.2+git20160808.1725654-2.
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*
* Copyright (C) 2001-2005 Ichiro Fujinaga, Michael Droettboom,
* and Karl MacMillan
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef mgd_arithmetic
#define mgd_arithmetic
#include <functional>
#include "gamera.hpp"
template<class T, class U, class FUNCTOR>
inline
typename ImageFactory<T>::view_type*
arithmetic_combine(T& a, const U& b, const FUNCTOR& functor, bool in_place) {
if (a.nrows() != b.nrows() || a.ncols() != b.ncols())
throw std::runtime_error("Images must be the same size.");
typedef typename T::value_type TVALUE;
typedef typename ImageFactory<T>::view_type VIEW;
if (in_place) {
typename T::vec_iterator ia = a.vec_begin();
typename U::const_vec_iterator ib = b.vec_begin();
typename choose_accessor<T>::accessor ad = choose_accessor<T>::make_accessor(a);
for (; ia != a.vec_end(); ++ia, ++ib) {
ad.set(NumericTraits<TVALUE>::fromPromote
(functor(typename NumericTraits<TVALUE>::Promote(*ia),
typename NumericTraits<TVALUE>::Promote(*ib))),
ia);
}
// Returning NULL is converted to None by the wrapper mechanism
return NULL;
} else {
typename ImageFactory<T>::data_type* dest_data =
new typename ImageFactory<T>::data_type(a.size(), a.origin());
VIEW* dest = new VIEW(*dest_data, a);
typename T::vec_iterator ia = a.vec_begin();
typename U::const_vec_iterator ib = b.vec_begin();
typename VIEW::vec_iterator id = dest->vec_begin();
typename choose_accessor<VIEW>::accessor ad = choose_accessor<VIEW>::make_accessor(*dest);
// Vigra's combineTwoImages does not clip back to one of the standard
// Gamera image types, so we have to do this differently ourselves. MGD
try {
for (; ia != a.vec_end(); ++ia, ++ib, ++id) {
ad.set(NumericTraits<TVALUE>::fromPromote
(functor(typename NumericTraits<TVALUE>::Promote(*ia),
typename NumericTraits<TVALUE>::Promote(*ib))),
id);
}
} catch (std::exception e) {
delete dest;
delete dest_data;
throw;
}
return dest;
}
}
template<class T, class U>
typename ImageFactory<T>::view_type*
add_images(T& a, const U& b, bool in_place=true) {
typedef typename T::value_type TVALUE;
typedef typename NumericTraits<TVALUE>::Promote PROMOTE;
return arithmetic_combine(a, b, std::plus<PROMOTE>(), in_place);
}
template <class T>
struct my_minus : public std::binary_function<T,T,T>
{
T operator()(const T& x, const T& y) const {
//typedef typename NumericTraits<T>::Promote PROMOTE;
return std::minus<T>()(x, y);
}
};
template<>
struct my_minus<OneBitPixel> : public std::binary_function<OneBitPixel, OneBitPixel, OneBitPixel>
{
OneBitPixel operator()(const OneBitPixel& x, const OneBitPixel& y) const {
// Note the result is inverted, because the default accessor performs an invert.
// GAAAH!
if (is_black(x) && !is_black(y))
return pixel_traits<OneBitPixel>::white();
else
return pixel_traits<OneBitPixel>::black();
}
};
template<class T, class U>
typename ImageFactory<T>::view_type*
subtract_images(T& a, const U& b, bool in_place=true) {
typedef typename T::value_type TVALUE;
return arithmetic_combine(a, b, my_minus<TVALUE>(), in_place);
}
template<class T, class U>
typename ImageFactory<T>::view_type*
multiply_images(T& a, const U& b, bool in_place=true) {
typedef typename T::value_type TVALUE;
typedef typename NumericTraits<TVALUE>::Promote PROMOTE;
return arithmetic_combine(a, b, std::multiplies<PROMOTE>(), in_place);
}
template<class T, class U>
typename ImageFactory<T>::view_type*
divide_images(T& a, const U& b, bool in_place=true) {
typedef typename T::value_type TVALUE;
typedef typename NumericTraits<TVALUE>::Promote PROMOTE;
return arithmetic_combine(a, b, std::divides<PROMOTE>(), in_place);
}
#endif
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