1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.acceleration; 18 19 import android.content.Context; 20 import android.graphics.Canvas; 21 import android.util.AttributeSet; 22 import android.view.View; 23 24 import java.util.concurrent.CountDownLatch; 25 import java.util.concurrent.TimeUnit; 26 27 public class AcceleratedView extends View { 28 29 private final CountDownLatch mDrawLatch = new CountDownLatch(1); 30 31 private boolean mIsHardwareAccelerated; 32 AcceleratedView(Context context)33 public AcceleratedView(Context context) { 34 super(context); 35 } 36 AcceleratedView(Context context, AttributeSet attrs)37 public AcceleratedView(Context context, AttributeSet attrs) { 38 super(context, attrs); 39 } 40 AcceleratedView(Context context, AttributeSet attrs, int defStyle)41 public AcceleratedView(Context context, AttributeSet attrs, int defStyle) { 42 super(context, attrs, defStyle); 43 } 44 45 @Override onDraw(Canvas canvas)46 protected void onDraw(Canvas canvas) { 47 super.onDraw(canvas); 48 synchronized (this) { 49 mIsHardwareAccelerated = canvas.isHardwareAccelerated(); 50 } 51 mDrawLatch.countDown(); 52 } 53 isCanvasHardwareAccelerated()54 public boolean isCanvasHardwareAccelerated() { 55 try { 56 if (mDrawLatch.await(1, TimeUnit.SECONDS)) { 57 synchronized (this) { 58 return mIsHardwareAccelerated; 59 } 60 } else { 61 throw new IllegalStateException("View was not drawn..."); 62 } 63 } catch (InterruptedException e) { 64 throw new RuntimeException(e); 65 } 66 } 67 } 68