1 files changed, 85 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/PreparePageFadeoutTexture.java b/src/com/android/gallery3d/ui/PreparePageFadeoutTexture.java
new file mode 100644
index 000000000..ce672f211
--- /dev/null
+++ b/src/com/android/gallery3d/ui/PreparePageFadeoutTexture.java
@@ -0,0 +1,85 @@
+package com.android.gallery3d.ui;
+
+import android.os.ConditionVariable;
+
+import com.android.gallery3d.app.AbstractGalleryActivity;
+import com.android.gallery3d.glrenderer.GLCanvas;
+import com.android.gallery3d.glrenderer.RawTexture;
+import com.android.gallery3d.ui.GLRoot.OnGLIdleListener;
+
+public class PreparePageFadeoutTexture implements OnGLIdleListener {
+    private static final long TIMEOUT = 200;
+    public static final String KEY_FADE_TEXTURE = "fade_texture";
+
+    private RawTexture mTexture;
+    private ConditionVariable mResultReady = new ConditionVariable(false);
+    private boolean mCancelled = false;
+    private GLView mRootPane;
+
+    public PreparePageFadeoutTexture(GLView rootPane) {
+        if (rootPane == null) {
+            mCancelled = true;
+            return;
+        }
+        int w = rootPane.getWidth();
+        int h = rootPane.getHeight();
+        if (w == 0 || h == 0) {
+            mCancelled = true;
+            return;
+        }
+        mTexture = new RawTexture(w, h, true);
+        mRootPane =  rootPane;
+    }
+
+    public boolean isCancelled() {
+        return mCancelled;
+    }
+
+    public synchronized RawTexture get() {
+        if (mCancelled) {
+            return null;
+        } else if (mResultReady.block(TIMEOUT)) {
+            return mTexture;
+        } else {
+            mCancelled = true;
+            return null;
+        }
+    }
+
+    @Override
+    public boolean onGLIdle(GLCanvas canvas, boolean renderRequested) {
+        if (!mCancelled) {
+            try {
+                canvas.beginRenderTarget(mTexture);
+                mRootPane.render(canvas);
+                canvas.endRenderTarget();
+            } catch (RuntimeException e) {
+                mTexture = null;
+            }
+        } else {
+            mTexture = null;
+        }
+        mResultReady.open();
+        return false;
+    }
+
+    public static void prepareFadeOutTexture(AbstractGalleryActivity activity,
+            GLView rootPane) {
+        PreparePageFadeoutTexture task = new PreparePageFadeoutTexture(rootPane);
+        if (task.isCancelled()) return;
+        GLRoot root = activity.getGLRoot();
+        RawTexture texture = null;
+        root.unlockRenderThread();
+        try {
+            root.addOnGLIdleListener(task);
+            texture = task.get();
+        } finally {
+            root.lockRenderThread();
+        }
+
+        if (texture == null) {
+            return;
+        }
+        activity.getTransitionStore().put(KEY_FADE_TEXTURE, texture);
+    }
+}