forked from tTh/FloatImg
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* interpolate.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 <math.h>
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#include "../floatimg.h"
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extern int verbosity;
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/* ---------------------------------------------------------------- */
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static int gray_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
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{
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int picsize, idx;
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picsize = d->width * d->height;
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for (idx=0; idx<picsize; idx++) {
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d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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static int rgb_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
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{
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int picsize, idx;
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picsize = d->width * d->height * 3; /* rude hack ? */
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for (idx=0; idx<picsize; idx++) {
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d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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int fimg_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
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{
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int foo;
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foo = fimg_images_compatible(s1, s2);
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if (foo) {
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fprintf(stderr, "compat -> %d\n", foo);
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return foo;
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}
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foo = fimg_images_compatible(s1, d);
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if (foo) {
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fprintf(stderr, "compat -> %d\n", foo);
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return foo;
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}
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switch (s1->type) {
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case FIMG_TYPE_GRAY:
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gray_interpolate(s1, s2, d, coef); break;
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case FIMG_TYPE_RGB:
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rgb_interpolate(s1, s2, d, coef); break;
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default:
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fprintf(stderr, "%s, %d is a bad type\n", __func__, s1->type);
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return -18;
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}
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return 0;
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}
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/* ---------------------------------------------------------------- */
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