commit b12428a128f358bbf23a54471e552dd49b2eaef4
author Craig Mautner <cmautner@google.com> Thu Dec 20 16:07:06 2012 -0800
committer Craig Mautner <cmautner@google.com> Thu Dec 20 16:24:58 2012 -0800
tree 1b16a3cb145382a69c162dcd4e5c2618c2521d70
parent 5b88cd721870748a071364852f19f266a8ea1de6

Save most recent thumbnail Bitmap for reuse.

This keeps Recents from taking two identical screenshots, one for
the Recents thumbnail and one for the pause activity thumbnail.

Fixes bug 7351766.

Change-Id: Ia4d12802151666ec36e4d9b395cf10e1e02dc37f

services/java/com/android/server/am/ActivityStack.java

diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index b007bc8..0e01e4c 100644
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -45,6 +45,7 @@
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
+import android.graphics.Bitmap.Config;
 import android.os.Binder;
 import android.os.Bundle;
 import android.os.Handler;
@@ -280,6 +281,13 @@
      */
     boolean mDismissKeyguardOnNextActivity = false;
 
+    /**
+     * Save the most recent screenshot for reuse. This keeps Recents from taking two identical
+     * screenshots, one for the Recents thumbnail and one for the pauseActivity thumbnail.
+     */
+    private ActivityRecord mLastScreenshotActivity = null;
+    private Bitmap mLastScreenshotBitmap = null;
+
     int mThumbnailWidth = -1;
     int mThumbnailHeight = -1;
 
@@ -931,8 +939,16 @@
         }
 
         if (w > 0) {
-            return mService.mWindowManager.screenshotApplications(who.appToken,
-                    Display.DEFAULT_DISPLAY, w, h);
+            if (who != mLastScreenshotActivity || mLastScreenshotBitmap == null
+                    || mLastScreenshotBitmap.getWidth() != w
+                    || mLastScreenshotBitmap.getHeight() != h) {
+                mLastScreenshotActivity = who;
+                mLastScreenshotBitmap = mService.mWindowManager.screenshotApplications(
+                        who.appToken, Display.DEFAULT_DISPLAY, w, h);
+            }
+            if (mLastScreenshotBitmap != null) {
+                return mLastScreenshotBitmap.copy(Config.ARGB_8888, true);
+            }
         }
         return null;
     }