[clutter/clutter-1.16] device: Guard against divisions by zero

[Emmanuele Bassi <ebassi src gnome org>]

commit fb8eacfb0256a211ca79366945c8f4eb4962be4e
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Sep 3 11:51:19 2013 +0100

    device: Guard against divisions by zero
    
    The range of a device could be 0, so we need to bail out from the
    scaling during the axis translation.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707033

 clutter/clutter-input-device.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/clutter/clutter-input-device.c b/clutter/clutter-input-device.c
index 38f7fd7..07951e3 100644
--- a/clutter/clutter-input-device.c
+++ b/clutter/clutter-input-device.c
@@ -46,6 +46,8 @@
 #include "clutter-private.h"
 #include "clutter-stage-private.h"
 
+#include <math.h>
+
 enum
 {
   PROP_0,
@@ -1218,6 +1220,9 @@ _clutter_input_device_translate_axis (ClutterInputDevice *device,
       info->axis == CLUTTER_INPUT_AXIS_Y)
     return FALSE;
 
+  if (fabs (info->max_value - info->min_value) < 0.0000001)
+    return FALSE;
+
   width = info->max_value - info->min_value;
   real_value = (info->max_axis * (value - info->min_value)
              + info->min_axis * (info->max_value - value))