From 3ceec6682fcbf2169143a4f3e6adef50b4f248bb Mon Sep 17 00:00:00 2001
From: John Cupitt <jcupitt@gmail.com>
Date: Mon, 5 Jan 2015 13:37:27 +0000
Subject: [PATCH] better error message from getpoint

---
 libvips/arithmetic/getpoint.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/libvips/arithmetic/getpoint.c b/libvips/arithmetic/getpoint.c
index 76601f6a..166c0349 100644
--- a/libvips/arithmetic/getpoint.c
+++ b/libvips/arithmetic/getpoint.c
@@ -96,9 +96,18 @@ vips_getpoint_build( VipsObject *object )
 	if( VIPS_OBJECT_CLASS( vips_getpoint_parent_class )->build( object ) )
 		return( -1 );
 
+	/* <0 ruled out already.
+	 */
+	if( getpoint->x >= getpoint->in->Xsize ||
+		getpoint->y >= getpoint->in->Ysize ) { 
+		vips_error( class->nickname, 
+			"%s", _( "coordinates out of range" ) ); 
+		return( -1 );
+	}
+
 	if( vips_check_coding_known( class->nickname, getpoint->in ) ||
 		!(region = vips_region_new( getpoint->in )) )
-		return( -1 );
+		return( -1 ); 
 
 	area.left = getpoint->x;
 	area.top = getpoint->y;