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      1 package com.android.gallery3d.ui;
      2 
      3 import android.os.ConditionVariable;
      4 
      5 import com.android.gallery3d.app.AbstractGalleryActivity;
      6 import com.android.gallery3d.glrenderer.GLCanvas;
      7 import com.android.gallery3d.glrenderer.RawTexture;
      8 import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
      9 
     10 public class PreparePageFadeoutTexture implements OnGLIdleListener {
     11     private static final long TIMEOUT = 200;
     12     public static final String KEY_FADE_TEXTURE = "fade_texture";
     13 
     14     private RawTexture mTexture;
     15     private ConditionVariable mResultReady = new ConditionVariable(false);
     16     private boolean mCancelled = false;
     17     private GLView mRootPane;
     18 
     19     public PreparePageFadeoutTexture(GLView rootPane) {
     20         int w = rootPane.getWidth();
     21         int h = rootPane.getHeight();
     22         if (w == 0 || h == 0) {
     23             mCancelled = true;
     24             return;
     25         }
     26         mTexture = new RawTexture(w, h, true);
     27         mRootPane =  rootPane;
     28     }
     29 
     30     public boolean isCancelled() {
     31         return mCancelled;
     32     }
     33 
     34     public synchronized RawTexture get() {
     35         if (mCancelled) {
     36             return null;
     37         } else if (mResultReady.block(TIMEOUT)) {
     38             return mTexture;
     39         } else {
     40             mCancelled = true;
     41             return null;
     42         }
     43     }
     44 
     45     @Override
     46     public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
     47         if (!mCancelled) {
     48             try {
     49                 canvas.beginRenderTarget(mTexture);
     50                 mRootPane.render(canvas);
     51                 canvas.endRenderTarget();
     52             } catch (RuntimeException e) {
     53                 mTexture = null;
     54             }
     55         } else {
     56             mTexture = null;
     57         }
     58         mResultReady.open();
     59         return false;
     60     }
     61 
     62     public static void prepareFadeOutTexture(AbstractGalleryActivity activity,
     63             GLView rootPane) {
     64         PreparePageFadeoutTexture task = new PreparePageFadeoutTexture(rootPane);
     65         if (task.isCancelled()) return;
     66         GLRoot root = activity.getGLRoot();
     67         RawTexture texture = null;
     68         root.unlockRenderThread();
     69         try {
     70             root.addOnGLIdleListener(task);
     71             texture = task.get();
     72         } finally {
     73             root.lockRenderThread();
     74         }
     75 
     76         if (texture == null) {
     77             return;
     78         }
     79         activity.getTransitionStore().put(KEY_FADE_TEXTURE, texture);
     80     }
     81 }
     82