forked from tTh/FloatImg
adding a "2 gray" function
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@ -59,6 +59,8 @@ double fimg_timer_set(int whot);
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double fimg_timer_get(int whot);
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int fimg_mk_gray_from(FloatImg *src, FloatImg*dst, int k);
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/* FIMG files module */
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int fimg_fileinfos(char *fname, int *datas);
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int fimg_dump_to_file(FloatImg *head, char *fname, int notused);
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@ -0,0 +1,56 @@
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/*
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* fimg-2gray.c
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "string.h"
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#include "../floatimg.h"
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extern int verbosity; /* must be declared around main() */
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/* --------------------------------------------------------------------- */
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/*
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* floating img MUST be allocated.
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*/
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int fimg_mk_gray_from(FloatImg *src, FloatImg*dst, int k)
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{
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float kr, kg, kb, kdiv;
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int nbb, foo;
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kr = kg = kb = 1.0; /* canonic random values */
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kdiv = kr + kg + kb;
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/* we must check the validity of our parameters */
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if (FIMG_TYPE_RGB != src->type) {
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fprintf(stderr, "%s : bad src type %d on %p\n", __func__,
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src->type, src);
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return -8;
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}
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if (FIMG_TYPE_GRAY != dst->type) {
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fprintf(stderr, "%s : bad dst type %d on %p\n", __func__,
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dst->type, dst);
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return -9;
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}
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/* entering the main processing loop */
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nbb = src->width * src->height;
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for (foo=0; foo<nbb; foo++) {
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dst->R[foo] = ( (src->R[foo] * kr) +
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(src->G[foo] * kg) +
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(src->B[foo] * kb) ) /
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kdiv;
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}
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return -1;
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}
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/* --------------------------------------------------------------------- */
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14
lib/t.c
14
lib/t.c
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@ -30,6 +30,16 @@ for (y=0; y<img->height; y++) {
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}
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return -1;
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}
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/* ---------------------------------------------------------------- */
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int essai_2gray(FloatImg *picz, char *outname)
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{
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return -1;
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}
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/* ---------------------------------------------------------------- */
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#define W 4000
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@ -56,6 +66,10 @@ foo = fimg_create(&result, W, H, 3);
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foo = fimg_add(&dessin, &noise, &result);
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fimg_save_as_pnm(&result, "r_add.pnm", 0);
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essai_2gray(&result, "gray.pnm");
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foo = fimg_sub(&dessin, &noise, &result);
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fimg_save_as_pnm(&result, "r_sub.pnm", 0);
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foo = fimg_mul(&dessin, &noise, &result);
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