drm_hwcomposer: fix missing assignment of premult flag

This was somehow dropped due to the recent squash ground work CL.

BUG=24791071
TEST=verify bug is fixed

Change-Id: If5f2b61104d47a2d70d3c3b34149c1d62ec82659

1 files changed, 1 insertions, 0 deletions

diff --git a/glworker.cpp b/glworker.cpp
index 7ea2a34..f72c0e1 100644
--- a/glworker.cpp
+++ b/glworker.cpp
@@ -406,6 +406,7 @@ static void ConstructCommand(const DrmHwcLayer *layers,
     }
 
     src.alpha = layer.alpha / 255.0f;
+    src.premult = (layer.blending == DrmHwcBlending::kPreMult) ? 1.0f : 0.0f;
   }
 }