compositor: Remove unneeded left shift for ARGB/AYUV SOURCE operator

The alpha value is already in the lower 8 bits from the beginning in
this case.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/610

diff --git a/gst/compositor/compositororc.orc b/gst/compositor/compositororc.orc
index fea01a4..beb10b8 100644 (file)
--- a/gst/compositor/compositororc.orc
+++ b/gst/compositor/compositororc.orc
@@ -77,8 +77,7 @@ storel d, t
 .const 4 a_not_alpha 0xffffff00
 
 loadl t, s
-shrul t2, t, 24
-convlw tw, t2
+convlw tw, t
 convwb tb, tw
 splatbl a, tb
 x4 convubw a_wide, a