[gegl] linear-gradient: Remove unnecessary sqrt()

[Daniel Sabo <daniels src gnome org>]

commit 9b14848c4a156b886cf878626313637cb937d26a
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Fri Mar 27 19:38:32 2015 -0700

    linear-gradient: Remove unnecessary sqrt()
    
    The old math was effectively sqrt(x^2+y^2)^2.

 operations/common/linear-gradient.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/operations/common/linear-gradient.c b/operations/common/linear-gradient.c
index 3aca0cf..642134e 100644
--- a/operations/common/linear-gradient.c
+++ b/operations/common/linear-gradient.c
@@ -81,7 +81,7 @@ process (GeglOperation       *operation,
   dx = o->end_x - o->start_x;
   dy = o->end_y - o->start_y;
 
-  length = sqrtf (dx * dx + dy * dy);
+  length = dx * dx + dy * dy;
 
   if (GEGL_FLOAT_IS_ZERO (length))
     {
@@ -101,7 +101,7 @@ process (GeglOperation       *operation,
           for (x = roi->x; x < roi->x + roi->width; ++x)
             {
               gint c;
-              gfloat v = (vec0 * (x - o->start_x) + vec1 * (y - o->start_y)) / length;
+              gfloat v = vec0 * (x - o->start_x) + vec1 * (y - o->start_y);
 
               if (v > 1.0f - GEGL_FLOAT_EPSILON)
                 v = 1.0f;