[GRASS-SVN] r73301 - grass/branches/releasebranch_7_6/imagery/i.segment

[svn_grass at osgeo.org]

Author: mmetz
Date: 2018-09-09 01:24:40 -0700 (Sun, 09 Sep 2018)
New Revision: 73301

Modified:
   grass/branches/releasebranch_7_6/imagery/i.segment/open_files.c
Log:
i.segment: input bands must not be NULL or constant (backport trunk r73300)

Modified: grass/branches/releasebranch_7_6/imagery/i.segment/open_files.c
===================================================================
--- grass/branches/releasebranch_7_6/imagery/i.segment/open_files.c	2018-09-09 08:23:55 UTC (rev 73300)
+++ grass/branches/releasebranch_7_6/imagery/i.segment/open_files.c	2018-09-09 08:24:40 UTC (rev 73301)
@@ -57,6 +57,14 @@
 	    G_fatal_error(_("No min/max found in raster map <%s>"),
 			  globals->Ref.file[n].name);
 	Rast_get_fp_range_min_max(&(fp_range[n]), &min[n], &max[n]);
+	if (Rast_is_d_null_value(&min[n])) {
+	    G_fatal_error(_("Input map <%s> is all NULL"),
+			  globals->Ref.file[n].name);
+	}
+	if (min[n] == max[n]) {
+	    G_fatal_error(_("Input map <%s> is a constant of value %g"),
+			  globals->Ref.file[n].name, min[n]);
+	}
 
 	G_debug(1, "Range for layer %d: min = %f, max = %f",
 		    n, min[n], max[n]);