forked from tTh/FloatImg
88 lines
2.0 KiB
C
88 lines
2.0 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 <stdint.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;
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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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d->G[idx] = (coef * s1->G[idx]) + ((1.0-coef) * s2->G[idx]);
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d->B[idx] = (coef * s1->B[idx]) + ((1.0-coef) * s2->B[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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#if DEBUG_LEVEL
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fprintf(stderr, ">>> %s ( %p %p %p %f )\n", __func__,
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s1, s2, d, coef);
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#endif
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/* sanity check here ? or may be ask the
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caller to do it himself ?
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*/
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if ( (coef < 0.0) || (coef >= 1.0) ){
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fprintf(stderr, "%s: coef %f out of range\n", __func__, coef);
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return -8;
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}
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foo = fimg_images_not_compatible(s1, s2);
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if (foo) {
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fprintf(stderr, "compat s1 s2 -> %d\n", foo);
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return foo;
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}
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foo = fimg_images_not_compatible(s1, d);
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if (foo) {
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fprintf(stderr, "compat s1 d -> %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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case FIMG_TYPE_RGBA:
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fprintf(stderr, "WTF?\n");
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return -18;
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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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