From 38089071300b8e04ed42236dd08d9055094fb3b8 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Tue, 15 Nov 2011 12:05:55 +0100
Subject: Introduce "libcrystfel"

---
 libcrystfel/src/image.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 libcrystfel/src/image.c

(limited to 'libcrystfel/src/image.c')

diff --git a/libcrystfel/src/image.c b/libcrystfel/src/image.c
new file mode 100644
index 00000000..75a8af0a
--- /dev/null
+++ b/libcrystfel/src/image.c
@@ -0,0 +1,144 @@
+/*
+ * image.c
+ *
+ * Handle images and image features
+ *
+ * (c) 2006-2010 Thomas White <taw@physics.org>
+ *
+ * Part of CrystFEL - crystallography with a FEL
+ *
+ */
+
+
+#include <stdlib.h>
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+
+#include "image.h"
+#include "utils.h"
+
+/**
+ * SECTION:image
+ * @short_description: Data structure representing an image
+ * @title: Image
+ * @section_id:
+ * @see_also:
+ * @include: "image.h"
+ * @Image:
+ *
+ * The <structname>image</structname> structure represents an image, usually one
+ * frame from a large series of diffraction patterns, which might be from the
+ * same or different crystals.
+ */
+
+
+struct _imagefeaturelist
+{
+	struct imagefeature	*features;
+	int			n_features;
+};
+
+
+void image_add_feature(ImageFeatureList *flist, double fs, double ss,
+                       struct image *parent, double intensity, const char *name)
+{
+	if ( flist->features ) {
+		flist->features = realloc(flist->features,
+		                    (flist->n_features+1)
+		                    *sizeof(struct imagefeature));
+	} else {
+		assert(flist->n_features == 0);
+		flist->features = malloc(sizeof(struct imagefeature));
+	}
+
+	flist->features[flist->n_features].fs = fs;
+	flist->features[flist->n_features].ss = ss;
+	flist->features[flist->n_features].intensity = intensity;
+	flist->features[flist->n_features].parent = parent;
+	flist->features[flist->n_features].name = name;
+	flist->features[flist->n_features].valid = 1;
+
+	flist->n_features++;
+
+}
+
+
+ImageFeatureList *image_feature_list_new()
+{
+	ImageFeatureList *flist;
+
+	flist = malloc(sizeof(ImageFeatureList));
+
+	flist->n_features = 0;
+	flist->features = NULL;
+
+	return flist;
+}
+
+
+void image_feature_list_free(ImageFeatureList *flist)
+{
+	if ( !flist ) return;
+
+	if ( flist->features ) free(flist->features);
+	free(flist);
+}
+
+
+struct imagefeature *image_feature_closest(ImageFeatureList *flist,
+                                           double fs, double ss,
+                                           double *d, int *idx)
+{
+	int i;
+	double dmin = +HUGE_VAL;
+	int closest = 0;
+
+	for ( i=0; i<flist->n_features; i++ ) {
+
+		double ds;
+
+		ds = distance(flist->features[i].fs, flist->features[i].ss,
+		              fs, ss);
+
+		if ( ds < dmin ) {
+			dmin = ds;
+			closest = i;
+		}
+
+	}
+
+	if ( dmin < +HUGE_VAL ) {
+		*d = dmin;
+		*idx = closest;
+		return &flist->features[closest];
+	}
+
+	*d = +INFINITY;
+	return NULL;
+}
+
+
+int image_feature_count(ImageFeatureList *flist)
+{
+	if ( flist == NULL ) return 0;
+	return flist->n_features;
+}
+
+
+struct imagefeature *image_get_feature(ImageFeatureList *flist, int idx)
+{
+	/* Sanity check */
+	if ( flist == NULL ) return NULL;
+	if ( idx > flist->n_features ) return NULL;
+
+	if ( flist->features[idx].valid == 0 ) return NULL;
+
+	return &flist->features[idx];
+}
+
+
+void image_remove_feature(ImageFeatureList *flist, int idx)
+{
+	flist->features[idx].valid = 0;
+}
-- 
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