Improve workspace's scrolling performance.

This is achieved by moving the 3D All Apps surface out of the screen when
it is not needed anymore. This saves us compositing costs that slow down
the drawing of the workspace.

Change-Id: I06ce1f77449fe1864517f4161913bc162c8e6b46

1 files changed, 16 insertions, 0 deletions

diff --git a/src/com/android/launcher2/AllApps3D.java b/src/com/android/launcher2/AllApps3D.java
index 9c3b3e4c7..b8aa8eccf 100644
--- a/src/com/android/launcher2/AllApps3D.java
+++ b/src/com/android/launcher2/AllApps3D.java
@@ -961,7 +961,23 @@ public class AllApps3D extends RSSurfaceView
         public void run() {
             sRollo.mScrollPos = ((float)mData[0]) / (1 << 16);
             mVelocity = ((float)mData[1]) / (1 << 16);
+
+            boolean lastVisible = isVisible();
             mZoom = ((float)mData[2]) / (1 << 16);
+
+            final boolean visible = isVisible();
+            if (visible != lastVisible) {
+                post(new Runnable() {
+                    public void run() {
+                        if (visible) {
+                            showSurface();
+                        } else {
+                            hideSurface();
+                        }
+                    }
+                });
+            }
+
             sZoomDirty = false;
         }
     }