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device: Guard against divisions by zero

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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
This commit is contained in:
Emmanuele Bassi 2013-09-03 11:51:19 +01:00
parent e90022f3c7
commit fb8eacfb02
1 changed files with 5 additions and 0 deletions
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5
clutter/clutter-input-device.c
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@ -46,6 +46,8 @@
#include "clutter-private.h" #include "clutter-private.h"
#include "clutter-stage-private.h" #include "clutter-stage-private.h"
#include <math.h>
enum enum
{ {
PROP_0, PROP_0,
@ -1218,6 +1220,9 @@ _clutter_input_device_translate_axis (ClutterInputDevice *device,
info->axis == CLUTTER_INPUT_AXIS_Y) info->axis == CLUTTER_INPUT_AXIS_Y)
return FALSE; return FALSE;
if (fabs (info->max_value - info->min_value) < 0.0000001)
return FALSE;
width = info->max_value - info->min_value; width = info->max_value - info->min_value;
real_value = (info->max_axis * (value - info->min_value) real_value = (info->max_axis * (value - info->min_value)
+ info->min_axis * (info->max_value - value)) + info->min_axis * (info->max_value - value))