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Commit afc3e11f authored by Romain Guy's avatar Romain Guy
Browse files

Add a method to hide/show a SurfaceView's surface. 

This can be used to move a surface offscreen to avoid the cost of compositing it.
This preserves the window and therefore the OpenGL context when used in h/w
accelerated apps.

Change-Id: I280295376601b17989d0fc8a271af66650016f09
parent df2e2eff

core/java/android/view/SurfaceView.java

+41 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 


package android.view;



import android.util.DisplayMetrics;

import com.android.internal.view.BaseIWindow;



import android.content.Context;
@@ -213,6 +214,46 @@ public class SurfaceView extends View { 
        updateWindow(false);

    }



    /**

     * This method is not intended for general use. It was created

     * temporarily to improve performance of 3D layers in Launcher

     * and should be removed and fixed properly.

     * 

     * Do not call this method. Ever.

     * 

     * @hide

     */

    protected void showSurface() {

        if (mSession != null) {

            updateWindow(true);

        }

    }



    /**

     * This method is not intended for general use. It was created

     * temporarily to improve performance of 3D layers in Launcher

     * and should be removed and fixed properly.

     * 

     * Do not call this method. Ever.

     * 

     * @hide

     */

    protected void hideSurface() {

        if (mSession != null && mWindow != null) {

            mSurfaceLock.lock();

            try {

                DisplayMetrics metrics = getResources().getDisplayMetrics();

                mLayout.x = metrics.widthPixels * 3;

                mSession.relayout(mWindow, mLayout, mWidth, mHeight, VISIBLE, false,

                        mWinFrame, mContentInsets, mVisibleInsets, mConfiguration, mSurface);

            } catch (RemoteException e) {

                // Ignore

            } finally {

                mSurfaceLock.unlock();

            }

        }

    }

    

    @Override

    protected void onDetachedFromWindow() {

        getViewTreeObserver().removeOnScrollChangedListener(mScrollChangedListener);