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Fade recents thumbnail to transparent earlier.

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Reduce the gpu load by fading the recents thumbnail to an alpha of
0.0 before the remaining animations are completed. When alpha hits
0 the gpu treats the layer as hidden and can merge the remaining
layers in time.

This is a partial fix for 7729214.

Change-Id: I9761bbd0554db6454c7eec0485be798b11672ff5
This commit is contained in:
Craig Mautner
2012-12-17 17:21:55 -08:00
parent da013c48d7
commit 3be73abc69
1 changed files with 17 additions and 3 deletions
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20
services/java/com/android/server/wm/WindowManagerService.java
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@ -268,6 +268,9 @@ public class WindowManagerService extends IWindowManager.Stub
/** Amount of time (in milliseconds) to delay before declaring a window freeze timeout. */
static final int WINDOW_FREEZE_TIMEOUT_DURATION = 2000;
/** Fraction of animation at which the recents thumbnail becomes completely transparent */
static final float RECENTS_THUMBNAIL_FADEOUT_FRACTION = 0.25f;
/**
* If true, the window manager will do its own custom freezing and general
* management of the screen during rotation.
@ -3383,13 +3386,24 @@ public class WindowManagerService extends IWindowManager.Stub
Animation scale = new ScaleAnimation(1, scaleW, 1, scaleH,
computePivot(mNextAppTransitionStartX, 1 / scaleW),
computePivot(mNextAppTransitionStartY, 1 / scaleH));
AnimationSet set = new AnimationSet(true);
AnimationSet set = new AnimationSet(false);
Animation alpha = new AlphaAnimation(1, 0);
scale.setDuration(duration);
scale.setInterpolator(
new DecelerateInterpolator(THUMBNAIL_ANIMATION_DECELERATE_FACTOR));
scale.setInterpolator(AnimationUtils.loadInterpolator(mContext,
com.android.internal.R.interpolator.decelerate_quad));
set.addAnimation(scale);
alpha.setDuration(duration);
alpha.setInterpolator(new Interpolator() {
@Override
public float getInterpolation(float input) {
if (input < RECENTS_THUMBNAIL_FADEOUT_FRACTION) {
// linear response
return input / RECENTS_THUMBNAIL_FADEOUT_FRACTION;
}
// complete
return 1;
}
});
set.addAnimation(alpha);
set.setFillBefore(true);
a = set;