1package com.bumptech.glide.load.resource.bitmap;
2
3import android.content.Context;
4import android.graphics.Bitmap;
5
6import com.bumptech.glide.Glide;
7import com.bumptech.glide.load.DecodeFormat;
8import com.bumptech.glide.load.ResourceDecoder;
9import com.bumptech.glide.load.engine.Resource;
10import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
11
12import java.io.InputStream;
13
14/**
15 * An {@link com.bumptech.glide.load.ResourceDecoder} that uses an
16 * {@link com.bumptech.glide.load.resource.bitmap.Downsampler} to decode an {@link android.graphics.Bitmap} from an
17 * {@link java.io.InputStream}.
18 */
19public class StreamBitmapDecoder implements ResourceDecoder<InputStream, Bitmap> {
20    private static final String ID = "StreamBitmapDecoder.com.bumptech.glide.load.resource.bitmap";
21    private final Downsampler downsampler;
22    private BitmapPool bitmapPool;
23    private DecodeFormat decodeFormat;
24    private String id;
25
26    public StreamBitmapDecoder(Context context) {
27        this(Glide.get(context).getBitmapPool());
28    }
29
30    public StreamBitmapDecoder(BitmapPool bitmapPool) {
31        this(bitmapPool, DecodeFormat.DEFAULT);
32    }
33
34    public StreamBitmapDecoder(Context context, DecodeFormat decodeFormat) {
35        this(Glide.get(context).getBitmapPool(), decodeFormat);
36    }
37
38    public StreamBitmapDecoder(BitmapPool bitmapPool, DecodeFormat decodeFormat) {
39        this(Downsampler.AT_LEAST, bitmapPool, decodeFormat);
40    }
41
42    public StreamBitmapDecoder(Downsampler downsampler, BitmapPool bitmapPool, DecodeFormat decodeFormat) {
43        this.downsampler = downsampler;
44        this.bitmapPool = bitmapPool;
45        this.decodeFormat = decodeFormat;
46    }
47
48    @Override
49    public Resource<Bitmap> decode(InputStream source, int width, int height) {
50        Bitmap bitmap = downsampler.decode(source, bitmapPool, width, height, decodeFormat);
51        return BitmapResource.obtain(bitmap, bitmapPool);
52    }
53
54    @Override
55    public String getId() {
56        if (id == null) {
57            id = new StringBuilder()
58                .append(ID)
59                .append(downsampler.getId())
60                .append(decodeFormat.name())
61                .toString();
62        }
63        return id;
64    }
65}
66