hdfsee: Add --image option

src/displaywindow.c

@@ -1112,7 +1112,8 @@ static gint displaywindow_press(GtkWidget *widget, GdkEventButton *event,
 
 DisplayWindow *displaywindow_open(const char *filename, const char *peaks,
                                   int boost, int binning, int cmfilter,
-                                  int noisefilter, int colscale)
+                                  int noisefilter, int colscale,
+                                  const char *element)
 {
 	DisplayWindow *dw;
 	char *title;
@@ -1163,12 +1164,22 @@ DisplayWindow *displaywindow_open(const char *filename, const char *peaks,
 		if ( dw->hdfile == NULL ) {
 			ERROR("Couldn't open file '%s'\n", filename);
 			displaywindow_disable(dw);
-		} else if ( hdfile_set_first_image(dw->hdfile, "/") ) {
-			ERROR("Couldn't select path\n");
-			displaywindow_disable(dw);
 		} else {
-			dw->image = calloc(1, sizeof(struct image));
-			hdf5_read(dw->hdfile, dw->image, 0, 0.0);
+			int fail = -1;
+
+			if ( element == NULL ) {
+				fail = hdfile_set_first_image(dw->hdfile, "/");
+			} else {
+				fail = hdfile_set_image(dw->hdfile, element);
+			}
+
+			if ( !fail ) {
+				dw->image = calloc(1, sizeof(struct image));
+				hdf5_read(dw->hdfile, dw->image, 0, 0.0);
+			} else {
+				ERROR("Couldn't select path\n");
+				displaywindow_disable(dw);
+			}
 		}
 
 	} else {

src/displaywindow.h

@@ -75,7 +75,8 @@ typedef struct {
 extern DisplayWindow *displaywindow_open(const char *filename,
                                          const char *peaks, int boost,
                                          int binning, int cmfilter,
-                                         int noisefilter, int colscale);
+                                         int noisefilter, int colscale,
+                                         const char *element);
 
 
 #endif	/* DISPLAYWINDOW_H */

src/hdfsee.c

@@ -49,6 +49,8 @@ static void show_help(const char *s)
 "                                    colour  : Colour scale:\n"
 "                                               black-blue-pink-red-orange-\n"
 "                                               -yellow-white.\n"
+"  -e, --image=<element>            Start up displaying this image from the\n"
+"                                    HDF5 file.  Example: /data/data0.\n"
 "\n");
 }
 
@@ -91,6 +93,7 @@ int main(int argc, char *argv[])
 	int config_noisefilter = 0;
 	int colscale = SCALE_COLOUR;
 	char *cscale = NULL;
+	char *element = NULL;
 
 	/* Long options */
 	const struct option longopts[] = {
@@ -101,13 +104,14 @@ int main(int argc, char *argv[])
 		{"filter-cm",          0, &config_cmfilter,    1},
 		{"filter-noise",       0, &config_noisefilter, 1},
 		{"colscale",           1, NULL,               'c'},
+		{"image",              1, NULL,               'e'},
 		{0, 0, NULL, 0}
 	};
 
 	gtk_init(&argc, &argv);
 
 	/* Short options */
-	while ((c = getopt_long(argc, argv, "hp:b:i:c:",
+	while ((c = getopt_long(argc, argv, "hp:b:i:c:e:",
 	                        longopts, NULL)) != -1) {
 
 		switch (c) {
@@ -138,6 +142,10 @@ int main(int argc, char *argv[])
 			cscale = strdup(optarg);
 			break;
 
+		case 'e' :
+			element = strdup(optarg);
+			break;
+
 		case 0 :
 			break;
 
@@ -169,13 +177,12 @@ int main(int argc, char *argv[])
 	}
 	free(cscale);
 
-
 	for ( i=0; i<nfiles; i++ ) {
 		main_window_list[i] = displaywindow_open(argv[optind+i], peaks,
 		                                         boost, binning,
 		                                         config_cmfilter,
 		                                         config_noisefilter,
-		                                         colscale);
+		                                         colscale, element);
 		if ( main_window_list[i] == NULL ) {
 			ERROR("Couldn't open display window\n");
 		} else {