From 7a755d5b5284598668979c51f140face0da616cf Mon Sep 17 00:00:00 2001
From: Ell <ell_se@yahoo.com>
Date: Fri, 17 Feb 2017 12:13:33 -0500
Subject: [PATCH] app: implement the different composite modes for dissolve
 mode

---
 .../layer-modes/gimpoperationdissolve.c       | 22 +++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/app/operations/layer-modes/gimpoperationdissolve.c b/app/operations/layer-modes/gimpoperationdissolve.c
index bd59ea8508..e99ff5f045 100644
--- a/app/operations/layer-modes/gimpoperationdissolve.c
+++ b/app/operations/layer-modes/gimpoperationdissolve.c
@@ -117,14 +117,32 @@ gimp_operation_dissolve_process (GeglOperation       *op,
               out[0] = in[0];
               out[1] = in[1];
               out[2] = in[2];
-              out[3] = in[3];
+
+              if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_SRC_OVER ||
+                  layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_SRC_ATOP)
+                {
+                  out[3] = in[3];
+                }
+              else
+                {
+                  out[3] = 0.0f;
+                }
             }
           else
             {
               out[0] = layer[0];
               out[1] = layer[1];
               out[2] = layer[2];
-              out[3] = 1.0;
+
+              if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_SRC_OVER ||
+                  layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_DST_ATOP)
+                {
+                  out[3] = 1.0f;
+                }
+              else
+                {
+                  out[3] = in[3];
+                }
             }
 
           in    += 4;