content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License
   */
  
  package com.android.internal.widget;
  
  import android.annotation.Nullable;
  import android.content.Context;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.graphics.drawable.BitmapDrawable;
  import android.graphics.drawable.Drawable;
  import android.net.Uri;
  
  import java.io.IOException;
  import java.io.InputStream;
  
  /**
   * A class to extract Bitmaps from a MessagingStyle message.
   */
  public class LocalImageResolver {
  
      private static final int MAX_SAFE_ICON_SIZE_PX = 480;
  
      @Nullable
      public static Drawable resolveImage(Uri uri, Context context) throws IOException {
          BitmapFactory.Options onlyBoundsOptions = getBoundsOptionsForImage(uri, context);
          if ((onlyBoundsOptions.outWidth == -1) || (onlyBoundsOptions.outHeight == -1)) {
              return null;
          }
  
          int originalSize =
                  (onlyBoundsOptions.outHeight > onlyBoundsOptions.outWidth)
                          ? onlyBoundsOptions.outHeight
                          : onlyBoundsOptions.outWidth;
  
          double ratio = (originalSize > MAX_SAFE_ICON_SIZE_PX)
                          ? (originalSize / MAX_SAFE_ICON_SIZE_PX)
                          : 1.0;
  
          BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
          bitmapOptions.inSampleSize = getPowerOfTwoForSampleRatio(ratio);
          InputStream input = context.getContentResolver().openInputStream(uri);
          Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions);
          input.close();
          return new BitmapDrawable(context.getResources(), bitmap);
      }
  
      private static BitmapFactory.Options getBoundsOptionsForImage(Uri uri, Context context)
              throws IOException {
          InputStream input = context.getContentResolver().openInputStream(uri);
          BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options();
          onlyBoundsOptions.inJustDecodeBounds = true;
          BitmapFactory.decodeStream(input, null, onlyBoundsOptions);
          input.close();
          return onlyBoundsOptions;
      }
  
      private static int getPowerOfTwoForSampleRatio(double ratio) {
          int k = Integer.highestOneBit((int) Math.floor(ratio));
          return Math.max(1, k);
      }
  }
  