[mutter/wip/fmuellner/gtk-shadows: 1/8] shaped-texture: Only mask alpha channel

[Florian Müllner <fmuellner src gnome org>]

commit aae007193f974b13102696944414eaa6e5e55c39
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Oct 27 16:21:15 2016 +0200

    shaped-texture: Only mask alpha channel
    
    We currently apply the mask texture to any channel, which means
    elements drawn outside the actual decorations are blended with
    gray. This should hardly matter in practice where shadows can
    be expected to be some shade of gray, but let's still make sure
    the odd theme with pink shadows or the like works correctly by
    applying the alpha mask to the alpha channel only.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744667

 src/compositor/meta-shaped-texture.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index 5b2630b..76dc1f1 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -216,7 +216,8 @@ get_masked_pipeline (CoglContext *ctx)
     {
       template = cogl_pipeline_copy (get_base_pipeline (ctx));
       cogl_pipeline_set_layer_combine (template, 1,
-                                       "RGBA = MODULATE (PREVIOUS, TEXTURE[A])",
+                                       "RGB = REPLACE (PREVIOUS)"
+                                       "A = MODULATE (PREVIOUS, TEXTURE)",
                                        NULL);
     }