first shoot

lib/fimg-math.c

@@ -0,0 +1,99 @@
+/*
+ *		fimg-core.c
+ *
+ *
+ */
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <unistd.h>
+#include  "string.h"
+
+#include  "../floatimg.h"
+
+extern int verbosity;		/* must be declared around main() */
+
+/* ---------------------------------------------------------------- */
+float fimg_get_maxvalue(FloatImg *head)
+{
+float		maxval;
+int		foo;
+
+maxval = 0.0;		/* no negative values allowed */
+
+for (foo=0; foo<(head->width*head->height); foo++) {
+	if (head->R[foo] > maxval) maxval = head->R[foo];
+	if (head->G[foo] > maxval) maxval = head->G[foo];
+	if (head->B[foo] > maxval) maxval = head->B[foo];
+	}
+
+return maxval;
+}
+/* ---------------------------------------------------------------- */
+int fimg_meanvalues(FloatImg *head, float means[4])
+{
+int		idx, surface;
+
+surface = head->width * head->height;
+if (surface < 1)	return -1;
+
+memset(means, 0, 4*sizeof(float));
+
+for (idx=0; idx<surface; idx++) {
+	means[0] += head->R[idx];
+	if (head->type > 2) {
+		means[1] += head->G[idx];
+		means[2] += head->B[idx];
+		}
+	}
+
+for (idx=0; idx<4; idx++)	means[idx] /= (float)surface;
+
+return 0;
+}
+/* ---------------------------------------------------------------- */
+int fimg_to_gray(FloatImg *head)
+{
+float		add;
+int		foo;
+
+for (foo=0; foo<(head->width*head->height); foo++) {
+	add  = head->R[foo];
+	add += head->G[foo];
+	add += head->B[foo];
+	head->R[foo] = head->G[foo] = head->B[foo] = add;
+	}
+return -1;
+}
+/* ---------------------------------------------------------------- */
+void fimg_add_cste(FloatImg *fi, float value)
+{
+int		nbre, idx;
+
+nbre = fi->width * fi->height * fi->type;
+#if DEBUG_LEVEL
+fprintf(stderr, "%s, nbre is %d\n", __func__, nbre);
+#endif
+for (idx=0; idx<nbre; nbre++) {
+	fi->R[idx] += value;
+	}
+}
+/* ---------------------------------------------------------------- */
+/*            Warning: this function is _very_ slow                 */
+void fimg_drand48(FloatImg *fi, float kmul)
+{
+int		nbre, idx;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %p %g )\n", __func__, fi, kmul);
+#endif
+
+nbre = fi->width * fi->height * fi->type;
+for (idx=0; idx<nbre; idx++) {
+	fi->R[idx] = drand48() * kmul;
+	}
+
+}
+/* ---------------------------------------------------------------- */
+
+