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adding fimg_get_minmax_rgb function

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Tonton Th
2020-03-02 01:19:57 +01:00
parent 248061f46b
commit 20da2de7fb
5 changed files with 101 additions and 12 deletions
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40
lib/fimg-math.c
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@@ -8,6 +8,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <float.h> /* for FLT_MAX */
#include <math.h>
#include "../floatimg.h"
@@ -44,6 +45,45 @@ switch (head->type) {
return maxval;
}
/* ---------------------------------------------------------------- */
/*
* mmval[0] <- min(R) mmval[1] <- max(R)
*/
int fimg_get_minmax_rgb(FloatImg *head, float mmvals[6])
{
int idx, surface;
float fval;
if (head->type != FIMG_TYPE_RGB) {
fprintf(stderr, "%s : type %d invalide\n",
__func__, head->type);
return -2;
}
surface = head->width * head->height;
mmvals[0] = FLT_MAX; mmvals[1] = -FLT_MAX;
mmvals[2] = FLT_MAX; mmvals[3] = -FLT_MAX;
mmvals[4] = FLT_MAX; mmvals[5] = -FLT_MAX;
for (idx=0; idx<surface; idx++) {
fval = head->R[idx];
if (fval < mmvals[0]) mmvals[0] = fval;
else if (fval > mmvals[1]) mmvals[1] = fval;
fval = head->G[idx];
if (fval < mmvals[2]) mmvals[2] = fval;
else if (fval > mmvals[3]) mmvals[3] = fval;
fval = head->B[idx];
if (fval < mmvals[4]) mmvals[4] = fval;
else if (fval > mmvals[5]) mmvals[5] = fval;
}
#if 0
for (foo=0; foo<6; foo++) {
fprintf(stderr, "%3d %g\n", foo, mmvals[foo]);
}
#endif
return -0;
}
/* ---------------------------------------------------------------- */
int fimg_meanvalues(FloatImg *head, float means[4])
{
int idx, surface;