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
17package com.android.internal.widget;
18
19import android.annotation.Nullable;
20import android.app.Notification;
21import android.content.Context;
22import android.graphics.Bitmap;
23import android.graphics.BitmapFactory;
24import android.graphics.drawable.BitmapDrawable;
25import android.graphics.drawable.Drawable;
26import android.net.Uri;
27
28import java.io.IOException;
29import java.io.InputStream;
30
31/**
32 * A class to extract Bitmaps from a MessagingStyle message.
33 */
34public class LocalImageResolver {
35
36    private static final int MAX_SAFE_ICON_SIZE_PX = 480;
37
38    @Nullable
39    public static Drawable resolveImage(Uri uri, Context context) throws IOException {
40        BitmapFactory.Options onlyBoundsOptions = getBoundsOptionsForImage(uri, context);
41        if ((onlyBoundsOptions.outWidth == -1) || (onlyBoundsOptions.outHeight == -1)) {
42            return null;
43        }
44
45        int originalSize =
46                (onlyBoundsOptions.outHeight > onlyBoundsOptions.outWidth)
47                        ? onlyBoundsOptions.outHeight
48                        : onlyBoundsOptions.outWidth;
49
50        double ratio = (originalSize > MAX_SAFE_ICON_SIZE_PX)
51                        ? (originalSize / MAX_SAFE_ICON_SIZE_PX)
52                        : 1.0;
53
54        BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
55        bitmapOptions.inSampleSize = getPowerOfTwoForSampleRatio(ratio);
56        InputStream input = context.getContentResolver().openInputStream(uri);
57        Bitmap bitmap = BitmapFactory.decodeStream(input, null, bitmapOptions);
58        input.close();
59        return new BitmapDrawable(context.getResources(), bitmap);
60    }
61
62    private static BitmapFactory.Options getBoundsOptionsForImage(Uri uri, Context context)
63            throws IOException {
64        InputStream input = context.getContentResolver().openInputStream(uri);
65        BitmapFactory.Options onlyBoundsOptions = new BitmapFactory.Options();
66        onlyBoundsOptions.inJustDecodeBounds = true;
67        BitmapFactory.decodeStream(input, null, onlyBoundsOptions);
68        input.close();
69        return onlyBoundsOptions;
70    }
71
72    private static int getPowerOfTwoForSampleRatio(double ratio) {
73        int k = Integer.highestOneBit((int) Math.floor(ratio));
74        return Math.max(1, k);
75    }
76}
77