1 /* 2 * Copyright (C) 2015 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 com.android.cts.view; 18 19 import android.content.Context; 20 import android.graphics.Canvas; 21 import android.view.SurfaceHolder; 22 import android.view.SurfaceView; 23 24 /** 25 * A {@link SurfaceView} that manages its own rendering thread and uses a {@link SurfaceRenderer} to 26 * dictate what should be drawn for each frame. 27 */ 28 public class RenderedSurfaceView extends SurfaceView implements SurfaceHolder.Callback { 29 30 private static final int JOIN_TIME_OUT_MS = 1000; 31 32 private SurfaceRenderer mRenderer; 33 private volatile boolean mRunning; 34 private Thread mRenderThread; 35 RenderedSurfaceView(Context context)36 public RenderedSurfaceView(Context context) { 37 super(context); 38 39 mRenderer = null; 40 mRunning = false; 41 getHolder().addCallback(this); 42 } 43 44 /** 45 * Sets the renderer to be used. 46 * 47 * <i>Must</i> be called after instantiation. 48 */ setRenderer(SurfaceRenderer renderer)49 public void setRenderer(SurfaceRenderer renderer) { 50 mRenderer = renderer; 51 } 52 53 @Override surfaceCreated(SurfaceHolder surfaceHolder)54 public void surfaceCreated(SurfaceHolder surfaceHolder) { 55 mRenderThread = new RenderThread(); 56 mRunning = true; 57 mRenderThread.start(); 58 } 59 60 @Override surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height)61 public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) { 62 // Configuration changes are disabled so surface changes can be ignored. 63 } 64 65 @Override surfaceDestroyed(SurfaceHolder surfaceHolder)66 public void surfaceDestroyed(SurfaceHolder surfaceHolder) { 67 mRunning = false; 68 // Wait for rendering thread to halt after it has observed that it should no longer render 69 while (true) { 70 try { 71 mRenderThread.join(JOIN_TIME_OUT_MS); 72 break; 73 } catch (InterruptedException e) { 74 // Ignore spurious wakeup 75 } 76 } 77 mRenderThread = null; 78 } 79 80 /** 81 * Thread to run the rendering loop for this SurfaceView. 82 */ 83 private final class RenderThread extends Thread { 84 private static final int SLEEP_TIME_MS = 16; 85 86 @Override run()87 public void run() { 88 while (mRunning) { 89 SurfaceHolder holder = getHolder(); 90 Canvas surfaceCanvas = holder.lockCanvas(); 91 // Draw onto canvas if valid 92 if (surfaceCanvas != null && mRenderer != null) { 93 mRenderer.onDrawFrame(surfaceCanvas); 94 holder.unlockCanvasAndPost(surfaceCanvas); 95 } 96 try { 97 sleep(SLEEP_TIME_MS); 98 } catch (InterruptedException e) { 99 // Stop rendering if interrupted 100 break; 101 } 102 } 103 } 104 } 105 } 106