From 2f3a8870c4a7dd090b10abed5588096993c3d57d Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Mon, 9 Sep 2019 16:02:44 +0200
Subject: [PATCH] starting interpolate funcs

---
 floatimg.h        |  3 +++
 lib/Makefile      |  9 ++++++--
 lib/interpolate.c | 44 ++++++++++++++++++++++++++++++++++++++
 lib/t.c           | 54 +++++++++++++++++++++++++++++++++++------------
 4 files changed, 95 insertions(+), 15 deletions(-)
 create mode 100644 lib/interpolate.c

diff --git a/floatimg.h b/floatimg.h
index 790448e4..9f0effc7 100644
--- a/floatimg.h
+++ b/floatimg.h
@@ -46,6 +46,9 @@ int   fimg_plot_rgb (FloatImg *head, int x, int y, float r, float g, float b);
 int   fimg_clear(FloatImg *fimg);
 int   fimg_add_rgb(FloatImg *head, int x, int y, float r, float g, float b);
 
+
+int fimg_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef);
+
 /*	'operats' module 		*/
 int fimg_add(FloatImg *a, FloatImg *b, FloatImg *d);
 int fimg_sub(FloatImg *a, FloatImg *b, FloatImg *d);
diff --git a/lib/Makefile b/lib/Makefile
index 308e1554..7d58bbd8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -4,7 +4,9 @@
 
 COPT = -Wall -fpic -g -no-pie -DDEBUG_LEVEL=0
 OBJS = fimg-core.o fimg-pnm.o fimg-file.o fimg-math.o	\
-	fimg-timers.o operators.o fimg-2gray.o
+	fimg-timers.o operators.o fimg-2gray.o		\
+	interpolate.o
+
 DEPS = Makefile ../floatimg.h
 
 # modify it 'as you like'
@@ -13,7 +15,7 @@ AR=ar
 all:	$(OBJS) ../libfloatimg.a
 
 t:	t.c ../libfloatimg.a $(DEPS)
-	gcc $(COPT) $< ../libfloatimg.a -lm -o $@
+	gcc $(COPT) $< ../libfloatimg.a -lpnglite -lm -o $@
 
 # --------------------------------------------
 
@@ -29,6 +31,9 @@ fimg-2gray.o:	fimg-2gray.c $(DEPS)
 operators.o:	operators.c $(DEPS)
 	gcc $(COPT) -c $<
 
+interpolate.o:	interpolate.c $(DEPS)
+	gcc $(COPT) -c $<
+
 fimg-pnm.o:	fimg-pnm.c $(DEPS)
 	gcc $(COPT) -c $<
 
diff --git a/lib/interpolate.c b/lib/interpolate.c
new file mode 100644
index 00000000..ac813abb
--- /dev/null
+++ b/lib/interpolate.c
@@ -0,0 +1,44 @@
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <unistd.h>
+#include  <string.h>
+#include  <math.h>
+
+#include  "../floatimg.h"
+
+int		verbosity;
+
+/* ---------------------------------------------------------------- */
+int fimg_interpolate(FloatImg *s1, FloatImg *s2, FloatImg *d, float coef)
+{
+int		picsize, idx;
+
+if (FIMG_TYPE_RGB != s1->type) {
+        fprintf(stderr, "%s : bad src 1 type %d on %p\n", __func__, 
+                                s1->type, s1);
+        return -8;
+        }
+
+if (FIMG_TYPE_RGB != s2->type) {
+        fprintf(stderr, "%s : bad src 2 type %d on %p\n", __func__, 
+                                s2->type, s2);
+        return -8;
+        }
+if (FIMG_TYPE_RGB != d->type) {
+        fprintf(stderr, "%s : bad dst type %d on %p\n", __func__, 
+                                d->type, d);
+        return -9;
+        }
+
+picsize = d->width * d->height * 2;
+
+for (idx=0; idx<picsize; idx++) {
+
+	d->R[idx] = (coef * s1->R[idx]) + ((1.0-coef) * s2->R[idx]);
+
+	}
+
+return -1;
+}
+/* ---------------------------------------------------------------- */
diff --git a/lib/t.c b/lib/t.c
index b4e53942..dd1076b6 100644
--- a/lib/t.c
+++ b/lib/t.c
@@ -1,3 +1,8 @@
+/*
+ *		programme de test pour
+ *		les fonctions de base.
+ */
+
 #include  <stdio.h>
 #include  <stdlib.h>
 #include  <unistd.h>
@@ -62,25 +67,48 @@ fimg_destroy(&gray);
 return 0;
 }
 /* ---------------------------------------------------------------- */
-#define W 2048
-#define H 2048
-int main(int argc, char *argv[])
-{
-int		foo;
-FloatImg 	dessin, noise, result;
-
-verbosity = 1;
-
-fimg_print_version(1);
-
+/****
 foo = fimg_create(&dessin, W, H, 3);
 petit_dessin(&dessin);
 foo = fimg_create(&noise, W, H, 3);
 fimg_drand48(&noise, 0.1);
 
+****/
+/* ---------------------------------------------------------------- */
+#define W 320
+#define H 240
+int main(int argc, char *argv[])
+{
+int		foo, idx;
+float		coef;
+FloatImg 	dessin, noise, result;
+char		outname[100];
+
+verbosity = 1;
+
+fimg_print_version(1);
+
+foo = fimg_create_from_png("/home/tth/TMP/floatimg/s2.png", &dessin);
+foo = fimg_create_from_png("/home/tth/TMP/floatimg/s1.png", &noise);
+
 foo = fimg_create(&result, W, H, 3);
-foo = fimg_mul(&dessin, &noise, &result);
-essai_2gray(&result, "gray.pnm");
+
+#define  NBRE 42
+
+for (idx=0; idx<NBRE; idx++) {
+
+	coef = (float)idx / (float)NBRE;
+	coef = (0.5-0.5*cos( 3.141592654*coef));
+
+
+
+	foo = fimg_interpolate(&dessin, &noise, &result, coef);
+	printf("%6d %9.6f\n", idx, coef);
+	fimg_to_gray(&result);
+	sprintf(outname, "/home/tth/TMP/floatimg/%05d.pnm", idx);
+	foo = fimg_save_as_pnm(&result, outname, 0);
+	}
+// essai_2gray(&result, "gray.pnm");
 
 fimg_destroy(&dessin), fimg_destroy(&noise), fimg_destroy(&result);