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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 com.android.compatibility.common.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 import android.util.Log;
     25 
     26 import java.io.ByteArrayInputStream;
     27 import java.io.ByteArrayOutputStream;
     28 import java.io.File;
     29 import java.io.FileNotFoundException;
     30 import java.io.FileOutputStream;
     31 import java.lang.reflect.Method;
     32 import java.util.Random;
     33 
     34 public class BitmapUtils {
     35     private static final String TAG = "BitmapUtils";
     36 
     37     private BitmapUtils() {}
     38 
     39     // Compares two bitmaps by pixels.
     40     public static boolean compareBitmaps(Bitmap bmp1, Bitmap bmp2) {
     41         if (bmp1 == bmp2) {
     42             return true;
     43         }
     44 
     45         if (bmp1 == null || bmp2 == null) {
     46             return false;
     47         }
     48 
     49         if ((bmp1.getWidth() != bmp2.getWidth()) || (bmp1.getHeight() != bmp2.getHeight())) {
     50             return false;
     51         }
     52 
     53         for (int i = 0; i < bmp1.getWidth(); i++) {
     54             for (int j = 0; j < bmp1.getHeight(); j++) {
     55                 if (bmp1.getPixel(i, j) != bmp2.getPixel(i, j)) {
     56                     return false;
     57                 }
     58             }
     59         }
     60         return true;
     61     }
     62 
     63     public static Bitmap generateRandomBitmap(int width, int height) {
     64         final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     65         final Random generator = new Random();
     66         for (int x = 0; x < width; x++) {
     67             for (int y = 0; y < height; y++) {
     68                 bmp.setPixel(x, y, generator.nextInt(Integer.MAX_VALUE));
     69             }
     70         }
     71         return bmp;
     72     }
     73 
     74     public static Bitmap generateWhiteBitmap(int width, int height) {
     75         final Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
     76         bmp.eraseColor(Color.WHITE);
     77         return bmp;
     78     }
     79 
     80     public static Bitmap getWallpaperBitmap(Context context) throws Exception {
     81         WallpaperManager wallpaperManager = WallpaperManager.getInstance(context);
     82         Class<?> noparams[] = {};
     83         Class<?> wmClass = wallpaperManager.getClass();
     84         Method methodGetBitmap = wmClass.getDeclaredMethod("getBitmap", noparams);
     85         return (Bitmap) methodGetBitmap.invoke(wallpaperManager, null);
     86     }
     87 
     88     public static ByteArrayInputStream bitmapToInputStream(Bitmap bmp) {
     89         final ByteArrayOutputStream bos = new ByteArrayOutputStream();
     90         bmp.compress(CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
     91         byte[] bitmapData = bos.toByteArray();
     92         return new ByteArrayInputStream(bitmapData);
     93     }
     94 
     95     private static void logIfBitmapSolidColor(String fileName, Bitmap bitmap) {
     96         int firstColor = bitmap.getPixel(0, 0);
     97         for (int x = 0; x < bitmap.getWidth(); x++) {
     98             for (int y = 0; y < bitmap.getHeight(); y++) {
     99                 if (bitmap.getPixel(x, y) != firstColor) {
    100                     return;
    101                 }
    102             }
    103         }
    104 
    105         Log.w(TAG, String.format("%s entire bitmap color is %x", fileName, firstColor));
    106     }
    107 
    108     public static void saveBitmap(Bitmap bitmap, String directoryName, String fileName) {
    109         new File(directoryName).mkdirs(); // create dirs if needed
    110 
    111         Log.d(TAG, "Saving file: " + fileName + " in directory: " + directoryName);
    112 
    113         if (bitmap == null) {
    114             Log.d(TAG, "File not saved, bitmap was null");
    115             return;
    116         }
    117 
    118         logIfBitmapSolidColor(fileName, bitmap);
    119 
    120         File file = new File(directoryName, fileName);
    121         try (FileOutputStream fileStream = new FileOutputStream(file)) {
    122             bitmap.compress(Bitmap.CompressFormat.PNG, 0 /* ignored for PNG */, fileStream);
    123             fileStream.flush();
    124         } catch (Exception e) {
    125             e.printStackTrace();
    126         }
    127     }
    128 }
    129