From e6379f633886fb8d17bf5ff181467329fd6edd8e Mon Sep 17 00:00:00 2001
From: tTh <tth@redlady.dinorama.fr>
Date: Wed, 14 Sep 2022 12:01:33 +0200
Subject: [PATCH] birthday new func: fimg_equalize

---
 floatimg.h       |  8 ++++++--
 funcs/equalize.c | 40 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/floatimg.h b/floatimg.h
index f21f6ee..46a206f 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -20,8 +20,11 @@
  *	https://git.tetalab.org/tTh/FloatImg
  */
 
-#define		FIMG_VERSION	(197)
+#define		FIMG_VERSION	(198)
 #define		RELEASE_NAME	("noname")
+
+/* XXX add a test for stdint.h / uint32_t XXX */
+
 /*
  *	in memory descriptor of a floating image
  */
@@ -228,8 +231,9 @@ int fimg_classif_trial(FloatImg *src, FloatImg*dst, float fval, int notused);
 int fimg_qsort_rgb_a(FloatImg *psrc, FloatImg *pdst, int notused);
 int fimg_qsort_rgb_b(FloatImg *psrc, FloatImg *pdst, int notused);
 
-/*	module funcs/??????.c		*/
+/*	module funcs/equalize.c		*/
 int fimg_equalize_compute(FloatImg *src, void *vptr, float vmax);
+int fimg_equalize(FloatImg *src, float vmax);
 
 int fimg_mk_gray_from(FloatImg *src, FloatImg*dst, int k);
 int fimg_desaturate(FloatImg *src, FloatImg *dst, int notused);
diff --git a/funcs/equalize.c b/funcs/equalize.c
index 36f4ab1..2a152c6 100644
--- a/funcs/equalize.c
+++ b/funcs/equalize.c
@@ -14,6 +14,46 @@
 extern int		verbosity;
 
 /* --------------------------------------------------------------------- */
+/*				new func: Wed 14 Sep 2022 11:28:04 AM CEST
+*/
+int fimg_equalize(FloatImg *src, float vmax)
+{
+float			mm[6], maxi, coef;
+int			foo;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p  %f )\n", __func__, src, vmax);
+#endif
+
+memset(mm, 0, 6*sizeof(float));
+foo = fimg_get_minmax_rgb(src, mm);
+if (foo) {
+	fprintf(stderr, "%s: err %d get_minmax\n", __func__, foo);
+	return foo;
+	}
+maxi = mm[1] > mm[3] ? mm[1] : mm[3];
+maxi = maxi  > mm[5] ? maxi  : mm[5];
+coef = vmax / maxi;
+
+if (verbosity) {
+	fprintf(stderr, "maximums  %.3f %.3f %.3f    %.3f\n",
+				mm[1], mm[3], mm[5], maxi);
+	fprintf(stderr, "vmax %f maxi %f multcoef = %g\n", vmax, maxi, coef);
+	}
+
+foo = fimg_mul_cste(src, coef);
+if (foo) {
+	fprintf(stderr, "%s: err %d mul_cste\n", __func__, foo);
+	return foo;
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+/*
+ *
+ *	- wtf is this "void *vptr" thing ?
+ */
 int fimg_equalize_compute(FloatImg *src, void *vptr, float vmax)
 {
 float			minmax[6];