[gegl] newsprint: adjust dotgain/gamma of cross pattern

[Øyvind Kolås <ok src gnome org>]

commit d41d2ca0439e00a9b9e4c2b9127e3a50813aa92e
Author: Øyvind Kolås <pippin gimp org>
Date:   Fri Mar 24 01:50:23 2017 +0100

    newsprint: adjust dotgain/gamma of cross pattern

 operations/common/newsprint.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/newsprint.c b/operations/common/newsprint.c
index d8c0490..cefc14f 100644
--- a/operations/common/newsprint.c
+++ b/operations/common/newsprint.c
@@ -157,7 +157,7 @@ float spachrotyze (
       }
       else if (pattern == 2) /* diamond */
       {
-        if (fabsf(wphase) + fabsf(qphase) < (part_white * 2) )
+        if ((fabsf(wphase) + fabsf(qphase))/2.0 < part_white )
           acc += 1.0 / aa_sq;
       }
       else if (pattern == 3) /* dot-to-diamond-to-dot */
@@ -180,6 +180,7 @@ float spachrotyze (
       }
       else if (pattern == 4) /* cross */
       {
+        part_white = powf (part_white, 2.0);
         if (fabsf (wphase) < part_white)
           acc += 1.0 / aa_sq;
         else if (fabsf (qphase) < part_white)