#ifndef __MYPNG_H__
#define __MYPNG_H__


#include <stdlib.h>
#include <strings.h>

#include <png.h>

#define PNG_WIDTH 4
#define PNG_COMPONENTS 3


struct pngdata {
    int width, height;
    png_bytep *rows;
};


/*
 * Amplifying each component of every pixel by a given coefficient.
 *
 * 'coeff' must be divided by 256 to get the real amplification
 * coefficient.
 */
void
png_amplify(struct pngdata *pp, unsigned int coeff);

int
png_write(const char *filename, struct pngdata *data);

const char *
png_read_8bit_rgb(const char *filename, struct pngdata *data);


void
png_destroy(struct pngdata *p_pd);

void
png_allocate(struct pngdata *p_pd);

void
png_copy(struct pngdata *src, struct pngdata *dest);

#endif /* !defined(__MYPNG_H__) */