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      1 /*
      2  * Copyright (C) 2018 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.amm.test;
     18 
     19 import android.content.Context;
     20 import android.graphics.Canvas;
     21 import android.view.TextureView;
     22 import android.view.ViewGroup;
     23 
     24 class TextureViewUse {
     25 
     26   private TextureView mTextureView;
     27 
     28   /**
     29    * Constructs a TextureView object with given dimensions.
     30    * The texture view is added to the given ViewGroup object, which should be
     31    * included in the main display.
     32    */
     33   public TextureViewUse(Context context, ViewGroup vg, int width, int height) {
     34     mTextureView = new TextureView(context);
     35     vg.addView(mTextureView, width, height);
     36     mTextureView.post(new CycleRunnable());
     37   }
     38 
     39   // To force as many graphics buffers as will ever be used to actually be
     40   // used, we cycle the color of the texture view a handful of times right
     41   // when things start up.
     42   private class CycleRunnable implements Runnable {
     43     private int mCycles = 0;
     44     private int mRed = 255;
     45     private int mGreen = 255;
     46     private int mBlue = 0;
     47 
     48     public void run() {
     49       if (mCycles < 10) {
     50         mCycles++;
     51         updateTextureView();
     52         mTextureView.post(this);
     53       }
     54     }
     55 
     56     private void updateTextureView() {
     57       Canvas canvas = mTextureView.lockCanvas();
     58       if (canvas != null) {
     59         canvas.drawRGB(mRed, mGreen, mBlue);
     60         int tmp = mRed;
     61         mTextureView.unlockCanvasAndPost(canvas);
     62         mRed = mGreen;
     63         mGreen = mBlue;
     64         mBlue = tmp;
     65       }
     66     }
     67   }
     68 }
     69 
     70