From 8db9ac4b7d5f97b0d48cbc0dff5c5730641c9844 Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Fri, 21 Jan 2011 14:39:52 -0800
Subject: [PATCH] Optimize call to drawBitmap during screen rotation.

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

Change-Id: Ibde82f358d92bd330b8c78c9db1ded6a0b4ba135
---
 .../java/com/android/server/ScreenRotationAnimation.java  | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/services/java/com/android/server/ScreenRotationAnimation.java b/services/java/com/android/server/ScreenRotationAnimation.java
index 2ad9cbe97d41e..bef64b3bf0ff3 100644
--- a/services/java/com/android/server/ScreenRotationAnimation.java
+++ b/services/java/com/android/server/ScreenRotationAnimation.java
@@ -23,6 +23,8 @@ import android.graphics.Color;
 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 @@ class ScreenRotationAnimation {
                 }
         
                 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);