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-rw-r--r--src/com/android/gallery3d/ui/AnimationTime.java45
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diff --git a/src/com/android/gallery3d/ui/AnimationTime.java b/src/com/android/gallery3d/ui/AnimationTime.java
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+
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.gallery3d.ui;
+
+import android.os.SystemClock;
+
+//
+// The animation time should ideally be the vsync time the frame will be
+// displayed, but that is an unknown time in the future. So we use the system
+// time just after eglSwapBuffers (when GLSurfaceView.onDrawFrame is called)
+// as a approximation.
+//
+public class AnimationTime {
+ private static volatile long sTime;
+
+ // Sets current time as the animation time.
+ public static void update() {
+ sTime = SystemClock.uptimeMillis();
+ }
+
+ // Returns the animation time.
+ public static long get() {
+ return sTime;
+ }
+
+ public static long startTime() {
+ sTime = SystemClock.uptimeMillis();
+ return sTime;
+ }
+}