forked from tTh/FloatImg
45 lines
893 B
C
45 lines
893 B
C
|
/*
|
||
|
|
* FloatImg library from tTh
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#include "../floatimg.h"
|
||
|
|
|
||
|
|
/* -------------------------------------------------------------- */
|
||
|
|
/* global vars from main
|
||
|
|
*/
|
||
|
|
extern int verbosity;
|
||
|
|
|
||
|
|
/* -------------------------------------------------------------- */
|
||
|
|
|
||
|
|
int fimg_mix_rgb_gray(FloatImg *img, float mix)
|
||
|
|
{
|
||
|
|
int x, y, p;
|
||
|
|
float gr;
|
||
|
|
|
||
|
|
if (FIMG_TYPE_RGB != img->type) {
|
||
|
|
fprintf(stderr, "%s bad type\n", __func__);
|
||
|
|
return -6;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (y=0; y<img->height; y++) {
|
||
|
|
p = y * img->width;
|
||
|
|
for (x=0; x<img->width; x++) {
|
||
|
|
|
||
|
|
gr = (img->R[p] + img->G[p] + img->R[p]) / 3.0;
|
||
|
|
|
||
|
|
img->R[p] = ((gr * mix) + (img->R[p] * (1.0-mix))) / 2.0;
|
||
|
|
img->G[p] = ((gr * mix) + (img->G[p] * (1.0-mix))) / 2.0;
|
||
|
|
img->B[p] = ((gr * mix) + (img->B[p] * (1.0-mix))) / 2.0;
|
||
|
|
|
||
|
|
p++; /* next pixel in the row */
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* -------------------------------------------------------------- */
|