[gimp] Bug 793734 - White alpha border after upscaling

[N/A <ell src gnome org>]

commit 289ecebd69ffa0b58fee368c8afc1a49423af06a
Author: Ell <ell_se yahoo com>
Date:   Thu Mar 22 16:53:08 2018 -0400

    Bug 793734 - White alpha border after upscaling
    
    In gimp_gegl_apply_scale(), use a CLAMP abyss policy for the scale
    op, to avoid leaking transparency into the image when scaling
    drawables.
    
    Note that this (intentionally) only affects whole-image/layer
    scaling, and not scaling done using any of the transform tools.

 app/gegl/gimp-gegl-apply-operation.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/app/gegl/gimp-gegl-apply-operation.c b/app/gegl/gimp-gegl-apply-operation.c
index 12375a2..ee21861 100644
--- a/app/gegl/gimp-gegl-apply-operation.c
+++ b/app/gegl/gimp-gegl-apply-operation.c
@@ -654,12 +654,13 @@ gimp_gegl_apply_scale (GeglBuffer            *src_buffer,
   g_return_if_fail (GEGL_IS_BUFFER (dest_buffer));
 
   node = gegl_node_new_child (NULL,
-                              "operation", "gegl:scale-ratio",
-                              "origin-x",   0.0,
-                              "origin-y",   0.0,
-                              "sampler",    interpolation_type,
-                              "x",          x,
-                              "y",          y,
+                              "operation",   "gegl:scale-ratio",
+                              "origin-x",     0.0,
+                              "origin-y",     0.0,
+                              "sampler",      interpolation_type,
+                              "abyss-policy", GEGL_ABYSS_CLAMP,
+                              "x",            x,
+                              "y",            y,
                               NULL);
 
   gimp_gegl_apply_operation (src_buffer, progress, undo_desc,