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      1 /*
      2  * Copyright (C) 2016 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.cts.util;
     18 
     19 import android.app.WallpaperManager;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.Bitmap.CompressFormat;
     23 import android.graphics.Color;
     24 
     25 import java.io.ByteArrayInputStream;
     26 import java.io.ByteArrayOutputStream;
     27 import java.lang.reflect.Method;
     28 import java.util.Random;
     29 
     30 public class BitmapUtils {
     31     private BitmapUtils() {}
     32 
     33     // Compares two bitmaps by pixels.
     34     public static boolean compareBitmaps(Bitmap bmp1, Bitmap bmp2) {
     35         if (bmp1 == bmp2) {
     36             return true;
     37         }
     38 
     39         if (bmp1 == null || bmp2 == null) {
     40             return false;
     41         }
     42 
     43         if ((bmp1.getWidth() != bmp2.getWidth()) || (bmp1.getHeight() != bmp2.getHeight())) {
     44             return false;
     45         }
     46 
     47         for (int i = 0; i < bmp1.getWidth(); i++) {
     48             for (int j = 0; j < bmp1.getHeight(); j++) {
     49                 if (bmp1.getPixel(i, j) != bmp2.getPixel(i, j)) {
     50                     return false;
     51                 }
     52             }
     53         }
     54         return true;
     55     }
     56 
     57     public static Bitmap generateRandomBitmap(int width, int height) {
     58         final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     59         final Random generator = new Random();
     60         for (int x = 0; x < width; x++) {
     61             for (int y = 0; y < height; y++) {
     62                 bmp.setPixel(x, y, generator.nextInt(Integer.MAX_VALUE));
     63             }
     64         }
     65         return bmp;
     66     }
     67 
     68     public static Bitmap generateWhiteBitmap(int width, int height) {
     69         final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     70         for (int x = 0; x < width; x++) {
     71             for (int y = 0; y < height; y++) {
     72                 bmp.setPixel(x, y, Color.WHITE);
     73             }
     74         }
     75         return bmp;
     76     }
     77 
     78     public static Bitmap getWallpaperBitmap(Context context) throws Exception {
     79         WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
     80         Class<?> noparams[] = {};
     81         Class<?> wmClass = wallpaperManager.getClass();
     82         Method methodGetBitmap = wmClass.getDeclaredMethod("getBitmap", noparams);
     83         return (Bitmap) methodGetBitmap.invoke(wallpaperManager, null);
     84     }
     85 
     86     public static ByteArrayInputStream bitmapToInputStream(Bitmap bmp) {
     87         final ByteArrayOutputStream bos = new ByteArrayOutputStream();
     88         bmp.compress(CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
     89         byte[] bitmapData = bos.toByteArray();
     90         return new ByteArrayInputStream(bitmapData);
     91     }
     92 }
     93