commit 8db9ac4b7d5f97b0d48cbc0dff5c5730641c9844
author Jeff Brown <jeffbrown@google.com> Fri Jan 21 14:39:52 2011 -0800
committer Jeff Brown <jeffbrown@google.com> Fri Jan 21 14:39:52 2011 -0800
tree c5a99786527ed7404903ff88f22cf759d73b5153
parent 2cb866b948c38923b31331a9b2f031eb9d791e6e

Optimize call to drawBitmap during screen rotation.

Using SRC mode reduces drawBitmap time from 50ms to 15ms.

Change-Id: Ibde82f358d92bd330b8c78c9db1ded6a0b4ba135

services/java/com/android/server/ScreenRotationAnimation.java

diff --git a/services/java/com/android/server/ScreenRotationAnimation.java b/services/java/com/android/server/ScreenRotationAnimation.java
index 2ad9cbe..bef64b3 100644
--- a/services/java/com/android/server/ScreenRotationAnimation.java
+++ b/services/java/com/android/server/ScreenRotationAnimation.java
@@ -23,6 +23,8 @@
 import android.graphics.Matrix;
 import android.graphics.Paint;
 import android.graphics.PixelFormat;
+import android.graphics.PorterDuff;
+import android.graphics.PorterDuffXfermode;
 import android.graphics.Rect;
 import android.util.DisplayMetrics;
 import android.util.Slog;
@@ -132,9 +134,11 @@
                 }
         
                 if (screenshot != null) {
-                    c.drawBitmap(screenshot, 0, 0, new Paint(0));
+                    Paint paint = new Paint(0);
+                    paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
+                    c.drawBitmap(screenshot, 0, 0, paint);
                 } else {
-                    c.drawColor(Color.GREEN);
+                    c.drawColor(Color.GREEN, PorterDuff.Mode.SRC);
                 }
 
                 mSurface.unlockCanvasAndPost(c);