[gimp] app: another optimization in GimpOperationGradient

[Michael Natterer <mitch src gnome org>]

commit cafb18643f3ae84c9a11564b09fe77da5e931c18
Author: Michael Natterer <mitch gimp org>
Date:   Wed Apr 18 12:45:58 2018 +0200

    app: another optimization in GimpOperationGradient
    
    Don't reallocate the cache in prepare() but only on demand in
    process().

 app/operations/gimpoperationgradient.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)
---
diff --git a/app/operations/gimpoperationgradient.c b/app/operations/gimpoperationgradient.c
index 69c5bbe..868591e 100644
--- a/app/operations/gimpoperationgradient.c
+++ b/app/operations/gimpoperationgradient.c
@@ -500,21 +500,9 @@ static void
 gimp_operation_gradient_prepare (GeglOperation *operation)
 {
   GimpOperationGradient *self = GIMP_OPERATION_GRADIENT (operation);
-  gint                   cache_size;
 
   gegl_operation_set_format (operation, "output", babl_format ("R'G'B'A float"));
 
-  cache_size = ceil (sqrt (SQR (self->start_x - self->end_x) +
-                           SQR (self->start_y - self->end_y))) * 4;
-
-  if (cache_size != self->gradient_cache_size)
-    {
-      g_clear_pointer (&self->gradient_cache, g_free);
-
-      self->gradient_cache      = g_new0 (GimpRGB, cache_size);
-      self->gradient_cache_size = cache_size;
-    }
-
   self->gradient_cache_valid = FALSE;
 }
 
@@ -1010,8 +998,20 @@ gimp_operation_gradient_process (GeglOperation       *operation,
   if (! self->gradient_cache_valid)
     {
       GimpGradientSegment *last_seg = NULL;
+      gint                 cache_size;
       gint                 i;
 
+      cache_size = ceil (sqrt (SQR (self->start_x - self->end_x) +
+                               SQR (self->start_y - self->end_y))) * 4;
+
+      if (cache_size != self->gradient_cache_size)
+        {
+          g_clear_pointer (&self->gradient_cache, g_free);
+
+          self->gradient_cache      = g_new0 (GimpRGB, cache_size);
+          self->gradient_cache_size = cache_size;
+        }
+
       for (i = 0; i < self->gradient_cache_size; i++)
         {
           gdouble factor = (gdouble) i / (gdouble) (self->gradient_cache_size - 1);