[gegl] stretch-contrast: avoid dividing by zero

[Michael Henning <mhenning src gnome org>]

commit 2404d230dca56fb0126101b13504e5e6f88f8873
Author: Michael Henning <drawoc darkrefraction com>
Date:   Fri Dec 21 22:25:30 2012 -0500

    stretch-contrast: avoid dividing by zero

 operations/common/stretch-contrast.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/stretch-contrast.c b/operations/common/stretch-contrast.c
index 140367b..de769f8 100644
--- a/operations/common/stretch-contrast.c
+++ b/operations/common/stretch-contrast.c
@@ -91,6 +91,12 @@ process (GeglOperation       *operation,
   buffer_get_min_max (input, &min, &max);
   diff = max - min;
 
+  /* Avoid a divide by zero error if the image is a solid color */
+  if (diff == 0.0){
+    gegl_buffer_copy (input, NULL, output, NULL);
+    return TRUE;
+  }
+
   gi = gegl_buffer_iterator_new (input, result, 0, babl_format ("RGBA float"),
                                  GEGL_BUFFER_READ, GEGL_ABYSS_NONE);