Program Listing for File image.hpp
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/*
Copyright (C) 2006 Pedro Felzenszwalb
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* a simple image class */
#ifndef GRID_MAP_SDF__DISTANCE_TRANSFORM__IMAGE_HPP_
#define GRID_MAP_SDF__DISTANCE_TRANSFORM__IMAGE_HPP_
#include <cstring>
namespace distance_transform
{
template<class T>
class image // NOLINT
{
public:
/* create an image */
image(const int width, const int height, const bool init = true);
/* delete an image */
~image();
/* init an image */
void init(const T & val);
/* copy an image */
image<T> * copy() const;
/* get the width of an image. */
int width() const {return w;}
/* get the height of an image. */
int height() const {return h;}
/* image data. */
T * data;
/* row pointers. */
T ** access;
private:
int w, h;
};
/* use imRef to access image data. */
#define imRef(im, x, y) (im->access[y][x])
/* use imPtr to get pointer to image data. */
#define imPtr(im, x, y) & (im->access[y][x])
template<class T>
image<T>::image(const int width, const int height, const bool init)
{
w = width;
h = height;
data = new T[w * h]; // allocate space for image data
access = new T *[h]; // allocate space for row pointers
// initialize row pointers
for (int i = 0; i < h; i++) {
access[i] = data + (i * w);
}
if (init) {
memset(data, 0, w * h * sizeof(T));
}
}
template<class T>
image<T>::~image()
{
delete[] data;
delete[] access;
}
template<class T>
void image<T>::init(const T & val)
{
T * ptr = imPtr(this, 0, 0);
T * end = imPtr(this, w - 1, h - 1);
while (ptr <= end) {
*ptr++ = val;
}
}
template<class T>
image<T> * image<T>::copy() const
{
image<T> * im = new image<T>(w, h, false);
memcpy(im->data, data, w * h * sizeof(T));
return im;
}
} // namespace distance_transform
#endif // GRID_MAP_SDF__DISTANCE_TRANSFORM__IMAGE_HPP_