[gegl] fix some floating point issues in color-to-alpha

[Simon Budig <simon src gnome org>]

commit c5350f934ff5262e74e2df2dc79822184a6bb428
Author: Simon Budig <simon budig de>
Date:   Tue Apr 16 15:45:48 2013 +0200

    fix some floating point issues in color-to-alpha

 operations/common/color-to-alpha.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/operations/common/color-to-alpha.c b/operations/common/color-to-alpha.c
index d0dcd67..01406c8 100644
--- a/operations/common/color-to-alpha.c
+++ b/operations/common/color-to-alpha.c
@@ -93,11 +93,11 @@ color_to_alpha (const gdouble *color,
 
   for (i=0; i<3; i++)
     {
-      if (color[i] < 0.0001)
+      if (color[i] < 0.00001)
         alpha[i] = dst[i];
-      else if (dst[i] > color[i])
+      else if (dst[i] > color[i] + 0.00001)
         alpha[i] = (dst[i] - color[i]) / (1.0f - color[i]);
-      else if (dst[i] < color[i])
+      else if (dst[i] < color[i] - 0.00001)
         alpha[i] = (color[i] - dst[i]) / (color[i]);
       else
         alpha[i] = 0.0f;
@@ -119,7 +119,7 @@ color_to_alpha (const gdouble *color,
       dst[3] = alpha[2];
     }
 
-  if (dst[3] < 0.0001)
+  if (dst[3] < 0.00001)
     return;
 
   for (i=0; i<3; i++)