gentoo-overlay/media-gfx/gimp/files/gimp-2.8.14-blend-center.patch

From 97e55692ebad5897be334c81c133b6626b9b6920 Mon Sep 17 00:00:00 2001
From: Michael Natterer <mitch@gimp.org>
Date: Wed, 26 Aug 2015 23:23:16 +0200
Subject: app: the blend tool was rendering all gradients off-by-0.5

When calculating the color of a pixel, we want to calculate the color
at its center, not at its top-left corner. Found by Raymond Jennings.

EDIT (by Sebastian Pipping <sping@gentoo.org>):
  Cut away patch chunk for app/operations/gimpoperationblend.c
  since 2.8.14 doesn't seem to have that file.

diff --git a/app/core/gimpdrawable-blend.c b/app/core/gimpdrawable-blend.c
index af565d1..e4f92a1 100644
--- a/app/core/gimpdrawable-blend.c
+++ b/app/core/gimpdrawable-blend.c
@@ -628,6 +628,10 @@ gradient_render_pixel (gdouble   x,
   RenderBlendData *rbd = render_data;
   gdouble          factor;
 
+  /*  we want to calculate the color at the pixel's center  */
+  x += 0.5;
+  y += 0.5;
+
   /* Calculate blending factor */
 
   switch (rbd->gradient_type)
-- 
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