Bibliothèque de traitements d'images en virgule flottante. http://la.buvette.org/photos/cumul/
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/*
* FLOATIMG - a kluge from tTh
* effets spéciaux bizarres sur les couleurs.
* nouveau pour un truc chelou avec Maëva
*/
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "../floatimg.h"
/* WARNING
some crapy code cuted & pasted here */
/* --------------------------------------------------------------------- */
static void highlight_red(FloatImg *src, FloatImg *dst, float fval)
{
int sz, idx;
sz = src->width * src->height;
for (idx=0; idx<sz; idx++) {
dst->G[idx] = src->G[idx];
dst->B[idx] = src->B[idx];
if ( (src->G[idx] < src->R[idx]) &&
(src->B[idx] < src->R[idx]) ) {
dst->R[idx] = src->R[idx] * fval;
}
else {
dst->R[idx] = src->R[idx];
}
}
}
/* --------------------------------------------------------------------- */
static void highlight_green(FloatImg *src, FloatImg *dst, float fval)
{
int sz, idx;
sz = src->width * src->height;
for (idx=0; idx<sz; idx++) {
dst->R[idx] = src->R[idx];
dst->B[idx] = src->B[idx];
if ( (src->R[idx] < src->R[idx]) &&
(src->B[idx] < src->R[idx]) ) {
dst->G[idx] = src->G[idx] * fval;
}
else {
dst->G[idx] = src->G[idx];
}
}
}
/* --------------------------------------------------------------------- */
static void highlight_blue(FloatImg *src, FloatImg *dst, float fval)
{
int sz, idx;
sz = src->width * src->height;
for (idx=0; idx<sz; idx++) {
dst->G[idx] = src->G[idx];
dst->R[idx] = src->R[idx];
if ( (src->G[idx] < src->B[idx]) &&
(src->R[idx] < src->B[idx]) ) {
dst->B[idx] = src->B[idx] * fval;
}
else {
dst->B[idx] = src->B[idx];
}
}
}
/* --------------------------------------------------------------------- */
int fimg_highlight_color(FloatImg *src, FloatImg *dst, char color, float fval)
{
#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( %p %p [%c] %f )\n", __func__,
src, dst, color, fval);
#endif
if (FIMG_TYPE_RGB != src->type) {
fprintf(stderr, "%s: bad src type %d on %p\n", __func__,
src->type, src);
return -8;
}
if (fimg_images_not_compatible(src, dst)) {
fprintf(stderr, "oh fuck in %s\n", __func__);
return -9;
}
switch (color) {
case 'r': case 'R':
highlight_red(src, dst, fval); break;
case 'g': case 'G':
highlight_green(src, dst, fval); break;
case 'b': case 'B':
highlight_blue(src, dst, fval); break;
default:
fprintf(stderr, "%s: '%c' is invalid\n", __func__, color);
return -11;
break; /* nottreached */
}
return 0;
}
/* --------------------------------------------------------------------- */
/* --------------------------------------------------------------------- */