libtthimage/colors.c

/*
                colors.c
		--------
*/

#include    <stdio.h>
#include    <stdlib.h>		/* for rand() */
#include    <time.h>
#include    <string.h>
#include    <math.h>

#ifdef NEED_ALLOCA_H
#include    <alloca.h> 
#endif

#include    "tthimage.h"

/*::------------------------------------------------------------------::*/
/*
	echange de deux composantes d'une image RGB
	what about swapping with the alpha channel ?
 */
int
Image_swap_colors(Image_Desc *im, char *cols)
{
uint8_t	*buffer;
int	y, code;

#if DEBUG_LEVEL
fprintf(stderr, "Echange de couleurs: [%s] %p\n", cols, im);
#endif

if (strlen(cols) != 2)
	{
	fprintf(stderr, "SwapColors: bad control string: '%s'\n", cols);
	return INVALID_PARAM;
	}

code = 0;
switch (cols[0])
	{
	case 'r':	case 'R':	code |= 0x10;		break;
	case 'g':	case 'G':	code |= 0x20;		break;
	case 'b':	case 'B':	code |= 0x30;		break;
	default:
		fprintf(stderr, "SwapColors: bad first color '%c'\n", cols[0]);
		return INVALID_PARAM;
	}
switch (cols[1])
	{
	case 'r':	case 'R':	code |= 0x1;		break;
	case 'g':	case 'G':	code |= 0x2;		break;
	case 'b':	case 'B':	code |= 0x3;		break;
	default:
		fprintf(stderr, "SwapColors: bad second color '%c'\n", cols[0]);
		return INVALID_PARAM;
	}

if ( (buffer=(uint8_t *)alloca(im->width)) == NULL )
	{
	fprintf(stderr, "SwapColors: no mem for buffer\n");
	return BUFFER_NO_MEM;
	}

#if DEBUG_LEVEL
fprintf(stderr, "SwapColors: code is %02x, buffer at %p\n", code, buffer);
#endif

for (y=0; y<im->height; y++)
	{
	switch (code)
		{
		case 0x12:	case 0x21:
			memcpy(buffer, im->Rpix[y], im->width);
			memcpy(im->Rpix[y], im->Gpix[y], im->width);
			memcpy(im->Gpix[y], buffer, im->width);
			break;
		case 0x13:	case 0x31:
			memcpy(buffer, im->Rpix[y], im->width);
			memcpy(im->Rpix[y], im->Bpix[y], im->width);
			memcpy(im->Bpix[y], buffer, im->width);
			break;
		case 0x23:	case 0x32:
			memcpy(buffer, im->Bpix[y], im->width);
			memcpy(im->Bpix[y], im->Gpix[y], im->width);
			memcpy(im->Gpix[y], buffer, im->width);
			break;
		default:
			fprintf(stderr, "SwapColors: code=%02x, Aie.\n", code);
			exit(1);
		}
	}

im->modified   = 1;	

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*
      cette func est cense donner une couleur RVB en
      fonction de deux parametre [0..1], mais c,a marche
      pas terrible, alors je vais faire encore des essais
 */
int
Image_color_x(double v1, double v2, int *pr, int *pg, int *pb)
{
double  s, c;

s = sin(v1*M_PI) + 1.0;         c = cos(v1*M_PI) + 1.0;

*pr = (int) (s  * 127.0);
*pg = (int) (c  * 127.0);
*pb = (int) (v2 * 255.0);

/* printf("%8f  %8f   %3d %3d %3d\n", v1, v2, *pr, *pg, *pb); */

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*
 *	Calcul de la couleur moyenne sur l'ensemble d'une image
 *	Il doit exister quelque part la meme fonction pour ce
 *	calcul sur une zone rectangulaire d'une image.
 */
int
Image_couleur_moyenne(Image_Desc *im, int *pr, int *pg, int *pb)
{
int	x, y;
long	sr, sg, sb, surface;

sr = sg = sb = 0L;

for (y=0; y<im->height; y++) {
	for (x=0; x<im->width; x++) {
        	sr += im->Rpix[y][x];
        	sg += im->Gpix[y][x];
        	sb += im->Bpix[y][x];
		}
	}

surface = (long)im->width * (long)im->height;
sr /= surface;	sg /= surface;	sb /= surface;

#if DEBUG_LEVEL
fprintf(stderr, "couleurs moyennes :   r=%ld   g=%ld   b=%ld\n", sr, sg, sb);
#endif

*pr = (int)sr;	*pg = (int)sg;	*pb = (int)sb;

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*
 * nouveau 28 juillet 2008 - avenue St Exupery
 */
int
Image_saturate(Image_Desc *src, Image_Desc *dst, int sr, int sg, int sb)
{
int	x, y, r, g, b;
int	foo;
int	minmax[6];

#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p\n", __func__, src, dst);
fprintf(stderr, "   r=%d g=%d b=%d\n", sr, sb, sg);
#endif

if ( (foo=Image_compare_desc(src, dst)) )
    {
    fprintf(stderr, "Image saturate: images are differents %d\n", foo);
    return foo;
    }

foo = Image_minmax_RGB(src, minmax);	/* pourquoi faire ce truc ici ? */
#if DEBUG_LEVEL
fprintf(stderr, "   calcul minmax -> %d\n", foo);
#endif

for (y=0; y<src->height; y++)
	{
	for (x=0; x<src->width; x++)
		{
		/* et il faut faire quoi, exactement ? */
		r = src->Rpix[y][x];
		g = src->Rpix[y][x];
		b = src->Rpix[y][x];

		/* je n'en ai pas la moindre ideee LOL */
		}
	}

return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/
/*
 * nouveau 12 mars 2009 - avenue St Exupery, avec du "Gros plant nantais"
 */
int
Image_desaturate(Image_Desc *src, Image_Desc *dst, int sr, int sg, int sb)
{
int	x, y, r, g, b;
int	foo;

#if DEBUG_LEVEL
fprintf(stderr, "%s : %p -> %p  :  ", __func__, src, dst);
fprintf(stderr, " %d %d %d\n", sr, sg, sb);
#endif

if ( (foo=Image_compare_desc(src, dst)) )
    {
    fprintf(stderr, "Image desaturate: images are differents %d\n", foo);
    return foo;
    }

for (y=0; y<src->height; y++)
	{
	for (x=0; x<src->width; x++)
		{
        	r = src->Rpix[y][x];
        	g = src->Gpix[y][x];
        	b = src->Bpix[y][x];

		if (r < sr)		r = sr;
		if (g < sg)		g = sg;
		if (b < sb)		b = sb;

		if (r > 256-sr)		r = (256-sr);
		if (g > 256-sg)		g = (256-sg);
		if (b > 256-sb)		b = (256-sb);

        	src->Rpix[y][x] = r;
        	src->Gpix[y][x] = g;
        	src->Bpix[y][x] = b;
		}
	}

return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/
/*
          Je ne sais plus d'ou sort cette formule, ni a quoi
          elle sert, ni comment faire le calcul inverse.
 */
int
Image_RGB_2_HLS(int r, int g, int b,  int *ph, int *pl, int *ps)
{
double  C1, C2, S, L, H;

C1 = sqrt(1.5) * (double)(r-g);
C2 = b - 0.5 * (double)(r+g);
S  = sqrt((C1*C1) + (C2*C2));
L  = (r+g+b) / 3.0;
H  = acos(C1/S);
if (C2 < 0.0)  H = (2*M_PI) - H;

*ph = H;    *ps = S;    *pl = L;

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*
 *			nouveau 12Jun2001
 *	16 Dec 2001: not fully tested, may be bogus :-(
 */
int Image_color_shift_rgb(Image_Desc *s, Image_Desc *d, int rs, int gs, int bs)
{
int	x, y, r, g, b;
int	foo;

if ( (foo=Image_compare_desc(s, d)) )
	{
	fprintf(stderr, "Shift RGB: src & dst are differents (%d)\n", foo);
	return foo;
	}

#if DEBUG_LEVEL
fprintf(stderr, "Shift RGB: %d %d %d\n", rs, gs, bs);
#endif

for (y=0; y<s->height; y++)
    {
    for (x=0; x<s->width; x++)
        {
        r = (s->Rpix[y][x] + rs) % 256;
        g = (s->Gpix[y][x] + gs) % 256;
        b = (s->Bpix[y][x] + bs) % 256;
	
	d->Rpix[y][x] = r;
	d->Gpix[y][x] = g;
	d->Bpix[y][x] = b;
	}
    }

d->modified = 1;

return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/
/*
	dans cette fonction, plein de trucs sont calcules en
	'double float' mais est-ce bien necessaire ?

 *	16 Dec 2001: not fully tested, may be bogus :-(

*/
int
Image_colors_recenter_0(Image_Desc *s, Image_Desc *d)
{
int	x, y, r, g, b;
int	or, og, ob;
double	cr, cg, cb, surface;

fprintf(stderr, "Image_colors_recenter_0 is a work in progress... ymmv.\n");

cr = cg = cb = 0.0;
for (y=0; y<s->height; y++)
    {
    for (x=0; x<s->width; x++)
        {
	Image_getRGB(s, x, y, &r, &g, &b);
	cr += (double)r;
	cg += (double)g;
	cb += (double)b;
	}
    }
fprintf(stderr, "colors recenter 0: %g  %g  %g\n", cr, cg, cb);
surface = (double)(s->width*s->height);
fprintf(stderr, "colors recenter 0: surface image %g\n", surface);

or = (int)(cr / surface);
og = (int)(cg / surface);
ob = (int)(cb / surface);
or -= 127;
og -= 127;
ob -= 127;
fprintf(stderr, "colors recenter 0: %d %d %d\n", or, og, ob);

for (y=0; y<s->height; y++)
    {
    for (x=0; x<s->width; x++)
        {
	Image_getRGB(s, x, y, &r, &g, &b);
	r = Image_clamp_pixel(r + or);
	g = Image_clamp_pixel(g + og);
	b = Image_clamp_pixel(b + ob);
	(d->Rpix[y])[x] = r;
	(d->Gpix[y])[x] = g;
	(d->Bpix[y])[x] = b;
	}
    }

return FUNC_IS_ALPHA;
}
/*::------------------------------------------------------------------::*/
#define CUB(x)  ((x)*(x))
/*
 *	XXX manque des explications sur l'usage du parametre 'mode'
 */
int
Image_colors_2_Map(Image_Desc *s, Image_Desc *d, RGB_map * map, int mode)
{
int     foo, x, y, m;
int     sr, sg, sb, dr, dg, db;
long    mindist, pos, dist;

if ( (foo=Image_compare_desc(s, d)) )       return foo;

if ( map->nbre == 0 )
	{
	fprintf(stderr, "%s: empty map at %p\n", __func__, map);
	/*
	 * WTF ? we have an empty map ?!? *
	 */
	return EMPTY_COL_MAP;	
	}

#if DEBUG_LEVEL
fprintf(stderr, "Colors 2 Map: %d couleurs dans la map\n", map->nbre);
#endif

pos = 0;		/* XXX verifier a quoi c,a sert ?! */

for (y=0; y<s->height; y++)
    {
    for (x=0; x<s->width; x++)
        {
        mindist = 99999999;
        sr = s->Rpix[y][x];
        sg = s->Gpix[y][x];
        sb = s->Bpix[y][x];

        for (m=0; m<map->nbre; m++)
            {
            switch (mode)
                {
                case 0:
                    dist = CUB(sr-map->red[m])   +
                           CUB(sg-map->green[m]) +
                           CUB(sb-map->blue[m]);
                    break;

		/*
		 *	There was probably a bug in this case...
		 */
                case 1:
                    dr = abs(sr - map->red[m]);
                    dg = abs(sg - map->green[m]);
                    db = abs(sb - map->blue[m]);
                    dist = dr;
                    if (dg < dist)  dist = dg;
                    if (db < dist)  dist = db;
                    break;

                case 2:
                    dr = abs(sr-map->red[m]);
                    dg = abs(sg-map->green[m]);
                    db = abs(sb-map->blue[m]);
                    dist = dr + dg + db;
                    break;

                case 11:
                    dist = CUB(sr-map->red[m]);
                    break;
                case 12:
                    dist = CUB(sg-map->green[m]);
                    break;
                case 13:
                    dist = CUB(sb-map->blue[m]);
                    break;

		default:
		    fprintf(stderr, "Colors To Map: invalid mode %d\n", mode);
		    return INVALID_PARAM;
                }

            if (dist < mindist)
                {
                pos = m;        mindist = dist;
                }
            }

	(d->Rpix[y])[x] = map->red[pos];
	(d->Gpix[y])[x] = map->green[pos];
	(d->Bpix[y])[x] = map->blue[pos];
        }
#if DEBUG_LEVEL
    if ( ! (y % 42) )
    	fprintf(stderr, "remapping line %4d / %d\r", y, s->height); 
#endif
    }

d->modified   = 1;

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*		ces coeffs viennent de Povray (a verifier) */

#define     R_COEF      297
#define     G_COEF      589
#define     B_COEF      114
#define     RGB_DIV	(R_COEF+G_COEF+B_COEF)

int
Image_to_gray_k(Image_Desc *s, Image_Desc *d, int kr, int kg, int kb, int flag)
{
int     x, y, r, g, b, v, foo;
int     grey, diviseur;
int	vmax;

#if DEBUG_LEVEL
fprintf(stderr, "converting image %p to gray in %p, flag %d\n", s, d, flag);
#endif

if ( (foo=Image_compare_desc(s, d)) )
	{
	fprintf(stderr, "To Gray: src & dst are differents (%d)\n", foo);
	return foo;
	}

diviseur = kr + kg + kb;
#if DEBUG_LEVEL
fprintf(stderr, "to Gray K:  %d  %d  %d    %d\n", kr, kg, kb, diviseur);
#endif

#if DEBUG_LEVEL > 1
if (flag==1) {
	fprintf(stderr, "%s: %d %d %d -> %d\n", __func__,
						kr, kg, kb, diviseur);
	}
#endif

if (diviseur==0) {
	fprintf(stderr, "%s: divisor is 0\n", __func__);
	return DIVISOR_IS_ZERO;
	}

vmax = 0;
for (y=0; y<s->height; y++)
    {
    for (x=0; x<s->width; x++)
        {
        r = s->Rpix[y][x];
        g = s->Gpix[y][x];
        b = s->Bpix[y][x];

        grey = (r * kr) + (g * kg) + (b * kb);
        v = grey / diviseur;

	if (v > vmax)	vmax=v;

        d->Rpix[y][x] = v;
        d->Gpix[y][x] = v;
        d->Bpix[y][x] = v;
        }
    }

#if DEBUG_LEVEL > 1
if (flag==1) {
	fprintf(stderr, "%s: max value is %d\n", __func__, vmax);
	}
#endif

d->modified   = 1;
return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
int
Image_to_gray(Image_Desc *s, Image_Desc *d, int flag)
{
int	foo;

#if DEBUG_LEVEL > 1
fprintf(stderr, "Image to gray: flag is %d\n", flag);
#endif

if (flag)
	foo=Image_to_gray_k(s, d, 100, 100, 100, flag);
else
	foo=Image_to_gray_k(s, d, R_COEF, G_COEF, B_COEF, flag);

return foo;
}
/*::------------------------------------------------------------------::*/
/*	8 Jan 2001
 *
 *  et on fait quoi si il y a pas assez de couleurs dans la MAP ?
 *				ben, on patche ?
 */
int
Image_apply_Map(Image_Desc *src, Image_Desc *dst, RGB_map *map)
{
int	x, y, r, g, b;

#if DEBUG_LEVEL
fprintf(stderr, "%s ( %p %p %p )\n", __func__, src, dst, map);
#endif

if (map->nbre == 0)
	{
	fprintf(stderr, "%s : no colors in palette ?\n", __func__);
	return EMPTY_COL_MAP;
	}

if (map->nbre < 255)
	{
	fprintf(stderr, "%s : only %d cols in palette\n", __func__, map->nbre);
	}

for (y=0; y<src->height; y++)
	{
	for (x=0; x<src->width; x++)
		{
		r = (src->Rpix[y])[x];
		g = (src->Gpix[y])[x];
		b = (src->Bpix[y])[x];

		r = map->red[r];
		g = map->green[g];
		b = map->blue[b];

		(dst->Rpix[y])[x] = r;
		(dst->Gpix[y])[x] = g;
		(dst->Bpix[y])[x] = b;
		}
	}
dst->modified = 1;

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/*	8 May 2001
    et on fait quoi si il y a pas assez de couleurs dans la MAP ? 	*/
int
Image_gray_Map(Image_Desc *src, Image_Desc *dst, RGB_map *map)
{
int	x, y, r, g, b, gray;

if (map->nbre == 0)
	{
	fprintf(stderr, "%s : no colors in palette ?\n", __func__);
	return VERY_STRANGE;
	}

if (map->nbre < 255)
	{
	fprintf(stderr, "%s : only %d cols in palette\n", __func__, map->nbre);
	}

for (y=0; y<src->height; y++)
	{
	for (x=0; x<src->width; x++)
		{
		r = (src->Rpix[y])[x];
		g = (src->Gpix[y])[x];
		b = (src->Bpix[y])[x];
        	gray = ((r * R_COEF) + (g * G_COEF) + (b * B_COEF)) / RGB_DIV;
		if (gray<0 || gray>255)
			{
			fprintf(stderr, "%s: GRAY---- %d\n", __func__, gray);
			exit(5);
			}
		r = map->red[gray];
		g = map->green[gray];
		b = map->blue[gray];

		(dst->Rpix[y])[x] = r;
		(dst->Gpix[y])[x] = g;
		(dst->Bpix[y])[x] = b;
		}
	}
dst->modified = 1;

return OLL_KORRECT;
}
/*::------------------------------------------------------------------::*/
/* new 10 janvier 2009 - avenue St Exupery */
static int parse_3_ints(char *str, int ints[])
{
char	*cptr, sep[] = " \t,";
int	idx;

#if DEBUG_LEVEL
fprintf(stderr, "%s ( %p %p )\n", __func__, str, ints);
#endif

idx = 0;
cptr = strtok(str, sep);
while (NULL != cptr) {
#if DEBUG_LEVEL
	fprintf(stderr, "%3d   %p -> %s\n", idx, cptr, cptr);
#endif
	ints[idx] = atoi(cptr);	
	cptr = strtok(NULL, sep);
	if (3 == idx)		break;
	idx ++;
	}

return 0;
}

int Image_default_RGBA(RGBA *ptr, char *texte, int flags)
{
char		*envptr;
int		foo;
int		values[4];

#if DEBUG_LEVEL
fprintf(stderr, "%s ( %p '%s' 0x%x )\n", __func__, ptr, texte, flags);
#endif

if ( NULL != (envptr=getenv(ENV_DEFAULT_RGBA)) ) {
#if DEBUG_LEVEL
	fprintf(stderr, "default rgb = '%s'\n", envptr);
#endif
	/* got the env var, parse it now */
	foo = parse_3_ints(envptr, values);
	ptr->r = values[0];
	ptr->g = values[1];
	ptr->b = values[2];
	ptr->a = values[3];
	}
else	{
	fprintf(stderr, "no '%s' env var defined\n", ENV_DEFAULT_RGBA);
	ptr->r = ptr->g = ptr->b = ptr->a = 142;
	}

/* quick and dirties default values */
ptr->reserved  = 0x42516988;
ptr->reserved2 = time(NULL);

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