Some optizations to wallpaper drawing/scrolling.

First, fix some issues with the final wallpaper bitmap
we use: ensure it is always 16bpp, and make sure dithering
of its bitmap is turned off.   We take of dithering
when loading, to make sure we don't use it when drawing.

Also add new APIs to return the wallpaper with the equivalent
of Launcher's old FastBitmapDrawable.  As doing this, also load
the default wallpaper the same way as custom ones, taking care to
resize it as needed at load time.

Finally implement a mechanism for the window manager to wait
for the wallpaper to redraw at its new position before returning
from the application's call to change the offset.  This ensures
that the wallpaper better tracks the application.  Note that there
is a timeout in this wait that is relatively short, and if it
expires we will run for a while without waiting.

Change-Id: Ife449437746da85958bd447e0a6cf3d2223b398c

3 files changed, 10 insertions, 2 deletions

diff --git a/core/java/android/view/IWindow.aidl b/core/java/android/view/IWindow.aidl
index ebc5f7b..b7953af 100644
--- a/core/java/android/view/IWindow.aidl
+++ b/core/java/android/view/IWindow.aidl
@@ -60,5 +60,5 @@ oneway interface IWindow {
     /**
      * Called for wallpaper windows when their offsets change.
      */
-    void dispatchWallpaperOffsets(float x, float y);
+    void dispatchWallpaperOffsets(float x, float y, boolean sync);
 }
diff --git a/core/java/android/view/IWindowSession.aidl b/core/java/android/view/IWindowSession.aidl
index 4d662d2..9b8b6d4 100644
--- a/core/java/android/view/IWindowSession.aidl
+++ b/core/java/android/view/IWindowSession.aidl
@@ -114,4 +114,6 @@ interface IWindowSession {
      * larger than the screen, set the offset within the screen.
      */
     void setWallpaperPosition(IBinder windowToken, float x, float y);
+    
+    void wallpaperOffsetsComplete(IBinder window);
 }
diff --git a/core/java/android/view/ViewRoot.java b/core/java/android/view/ViewRoot.java
index b61465a..6748ade 100644
--- a/core/java/android/view/ViewRoot.java
+++ b/core/java/android/view/ViewRoot.java
@@ -2868,7 +2868,13 @@ public final class ViewRoot extends Handler implements ViewParent,
             }
         }
         
-        public void dispatchWallpaperOffsets(float x, float y) {
+        public void dispatchWallpaperOffsets(float x, float y, boolean sync) {
+            if (sync) {
+                try {
+                    sWindowSession.wallpaperOffsetsComplete(asBinder());
+                } catch (RemoteException e) {
+                }
+            }
         }
     }