libtthimage/Lib/contrast.c

/*
 *	contrast.c - 31 dec 2013
 */

#include  <stdio.h>
#include  <math.h>
#include  "../tthimage.h"

/*::------------------------------------------------------------------::*/
/*
 *	cette fonction peut etre utilisee avec la meme image
 *	en source et en destination.
 */
int Image_pix_square(Image_Desc *source, Image_Desc *but, int k)
{
int     x, y, r, g, b, foo;
float	fr, fg, fb;

#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p\n", __func__, source, but);
#endif

if ( (foo=Image_compare_desc(source, but)) ) {
    fprintf(stderr, "%s : images are differents %d\n", __func__, foo);
    return foo;
    }

for (y=0; y<source->height; y++) {
	for (x=0; x<source->width; x++) {
        	fr = ((float)(source->Rpix[y])[x]) / 255.0;
        	fg = ((float)(source->Gpix[y])[x]) / 255.0;
        	fb = ((float)(source->Bpix[y])[x]) / 255.0;
		r = (int)(fr * fr * 255.0);
		g = (int)(fg * fg * 255.0);
		b = (int)(fb * fb * 255.0);
        	(but->Rpix[y])[x] = r;
        	(but->Gpix[y])[x] = g;
        	(but->Bpix[y])[x] = b;
		}
	}

return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/
/*
 *	cette fonction peut etre utilisee avec la meme image
 *	en source et en destination.
 */
int Image_pix_sqroot(Image_Desc *source, Image_Desc *but, int k)
{
int     x, y, foo;
float	fr, fg, fb;

#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p\n", __func__, source, but);
#endif

if ( (foo=Image_compare_desc(source, but)) ) {
    fprintf(stderr, "%s : images are differents %d\n", __func__, foo);
    return foo;
    }

for (y=0; y<source->height; y++) {
	for (x=0; x<source->width; x++) {
        	fr = ((float)(source->Rpix[y])[x]) / 255.0;
        	fg = ((float)(source->Gpix[y])[x]) / 255.0;
        	fb = ((float)(source->Bpix[y])[x]) / 255.0;
		(but->Rpix[y])[x] = (int)(sqrt(fr) * 255.0);
		(but->Gpix[y])[x] = (int)(sqrt(fg) * 255.0);
		(but->Bpix[y])[x] = (int)(sqrt(fb) * 255.0);
		}
	}

return FUNC_IS_BETA;
}
/*::------------------------------------------------------------------::*/