Home | History | Annotate | Download | only in common 
      1 /*
      2  * Copyright 2014, 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.managedprovisioning.common;
     18 
     19 import android.annotation.NonNull;
     20 import android.content.Context;
     21 import android.graphics.Bitmap;
     22 import android.graphics.BitmapFactory;
     23 import android.graphics.PorterDuff;
     24 import android.graphics.drawable.BitmapDrawable;
     25 import android.graphics.drawable.Drawable;
     26 import android.net.Uri;
     27 
     28 import com.android.internal.annotations.VisibleForTesting;
     29 import com.android.managedprovisioning.R;
     30 
     31 import java.io.File;
     32 
     33 public class LogoUtils {
     34     @VisibleForTesting static final int DEFAULT_LOGO_ID = R.drawable.ic_enterprise_blue_24dp;
     35 
     36     public static void saveOrganisationLogo(Context context, Uri uri) {
     37         final File logoFile = getOrganisationLogoFile(context);
     38         StoreUtils.copyUriIntoFile(context.getContentResolver(), uri, logoFile);
     39     }
     40 
     41     /**
     42      * @param colorTint optional color colorTint to apply to the logo
     43      */
     44     public static @NonNull Drawable getOrganisationLogo(Context context, Integer colorTint) {
     45         final File logoFile = getOrganisationLogoFile(context);
     46         Bitmap bitmap = null;
     47         int maxWidth = (int) context.getResources().getDimension(R.dimen.max_logo_width);
     48         int maxHeight = (int) context.getResources().getDimension(R.dimen.max_logo_height);
     49         if (logoFile.exists()) {
     50             bitmap = getBitmapPartiallyResized(logoFile.getPath(), maxWidth, maxHeight);
     51             if (bitmap == null) {
     52                 ProvisionLogger.loge("Could not get organisation logo from " + logoFile);
     53             }
     54         }
     55 
     56         if (bitmap != null) {
     57             return new BitmapDrawable(context.getResources(),
     58                     resizeBitmap(bitmap, maxWidth, maxHeight));
     59         }
     60 
     61         // fall back to a default logo
     62         Drawable organisationLogo = context.getDrawable(DEFAULT_LOGO_ID);
     63         if (colorTint != null) {
     64             organisationLogo.setColorFilter(colorTint, PorterDuff.Mode.SRC_ATOP);
     65         }
     66         return organisationLogo;
     67     }
     68 
     69     /**
     70      * Decodes a bitmap from an input stream.
     71      * If the actual dimensions of the bitmap are larger than the desired ones, will try to return a
     72      * subsample.
     73      * The point of using this method is that the entire image may be too big to fit entirely in
     74      * memmory. Since we may not need the entire image anyway, it's better to only decode a
     75      * subsample when possible.
     76      */
     77     @VisibleForTesting
     78     static Bitmap getBitmapPartiallyResized(String filePath, int maxDesiredWidth,
     79             int maxDesiredHeight) {
     80         BitmapFactory.Options bounds = new BitmapFactory.Options();
     81         // Firstly, let's just get the dimensions of the image.
     82         bounds.inJustDecodeBounds = true;
     83         BitmapFactory.decodeFile(filePath, bounds);
     84         int streamWidth = bounds.outWidth;
     85         int streamHeight = bounds.outHeight;
     86         int ratio = Math.max(streamWidth / maxDesiredWidth, streamHeight / maxDesiredHeight);
     87         if (ratio > 1) {
     88             // Decodes a smaller bitmap. Note that this ratio will be rounded down to the nearest
     89             // power of 2. The decoded bitmap will not have the expected size, but we'll do another
     90             // round of scaling.
     91             bounds.inSampleSize = ratio;
     92         }
     93         bounds.inJustDecodeBounds = false;
     94         // Now, decode the actual bitmap
     95         return BitmapFactory.decodeFile(filePath, bounds);
     96     }
     97 
     98     /*
     99      * Returns a new Bitmap with the specified maximum width and height. Does scaling if
    100      * necessary. Keeps the ratio of the original image.
    101      */
    102     @VisibleForTesting
    103     static Bitmap resizeBitmap(Bitmap bitmap, int maxWidth, int maxHeight) {
    104         int width = bitmap.getWidth();
    105         int height = bitmap.getHeight();
    106         double ratio = Math.max((double) width / maxWidth, (double) height / maxHeight);
    107         // We don't scale up.
    108         if (ratio > 1) {
    109             width /= ratio;
    110             height /= ratio;
    111             bitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);
    112         }
    113         return bitmap;
    114     }
    115 
    116     public static void cleanUp(Context context) {
    117         getOrganisationLogoFile(context).delete();
    118     }
    119 
    120     private static File getOrganisationLogoFile(Context context) {
    121         return new File(context.getFilesDir() + File.separator + "organisation_logo");
    122     }
    123 }
    124