[gimp] Clamp levels after input changes applied.

[Sven Neumann <neo src gnome org>]

commit fc66ca5169aea63c0f52ff799511c644c4661eba
Author: Mason Thomas <mason_thomas hotmail com>
Date:   Wed Jul 15 22:50:06 2009 -0700

    Clamp levels after input changes applied.

 app/base/levels.c              |    8 ++++----
 app/gegl/gimpoperationlevels.c |    8 ++++----
 2 files changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/app/base/levels.c b/app/base/levels.c
index 4be2da6..16fff75 100644
--- a/app/base/levels.c
+++ b/app/base/levels.c
@@ -90,12 +90,12 @@ levels_lut_func (Levels *levels,
           inten = (gdouble) (255.0 * inten - levels->low_input[j]);
         }
 
+      /* clamp to new black and white points */
+      inten = CLAMP (inten, 0.0, 1.0);
+
       if (levels->gamma[j] != 0.0)
         {
-          if (inten >= 0.0)
-            inten =  pow ( inten, (1.0 / levels->gamma[j]));
-          else
-            inten = -pow (-inten, (1.0 / levels->gamma[j]));
+          inten =  pow ( inten, (1.0 / levels->gamma[j]));
         }
 
       /*  determine the output intensity  */
diff --git a/app/gegl/gimpoperationlevels.c b/app/gegl/gimpoperationlevels.c
index 01cc7b1..d7a706a 100644
--- a/app/gegl/gimpoperationlevels.c
+++ b/app/gegl/gimpoperationlevels.c
@@ -89,12 +89,12 @@ gimp_operation_levels_map (gdouble value,
   else
     value = (value - low_input);
 
+  /* clamp to new black and white points */
+  value = CLAMP (value, 0.0, 1.0);
+
   if (inv_gamma != 1.0)
     {
-      if (value >= 0.0)
-        value =  pow ( value, inv_gamma);
-      else
-        value = -pow (-value, inv_gamma);
+      value =  pow ( value, inv_gamma);
     }
 
   /*  determine the output intensity  */