1package com.bumptech.glide.load.resource.bitmap;
2
3import android.graphics.Bitmap;
4import android.util.Log;
5
6import com.bumptech.glide.load.ResourceEncoder;
7import com.bumptech.glide.load.engine.Resource;
8import com.bumptech.glide.util.LogTime;
9import com.bumptech.glide.util.Util;
10
11import java.io.OutputStream;
12
13/**
14 * An {@link com.bumptech.glide.load.ResourceEncoder} that writes {@link android.graphics.Bitmap}s to
15 * {@link java.io.OutputStream}s.
16 *
17 * <p>
18 *     {@link android.graphics.Bitmap}s that return true from {@link android.graphics.Bitmap#hasAlpha()}} are written
19 *     using {@link android.graphics.Bitmap.CompressFormat#PNG} to preserve alpha and all other bitmaps are written
20 *     using {@link android.graphics.Bitmap.CompressFormat#JPEG}.
21 * </p>
22 *
23 * @see android.graphics.Bitmap#compress(android.graphics.Bitmap.CompressFormat, int, java.io.OutputStream)
24 */
25public class BitmapEncoder implements ResourceEncoder<Bitmap> {
26    private static final String TAG = "BitmapEncoder";
27    private static final int DEFAULT_COMPRESSION_QUALITY = 90;
28    private Bitmap.CompressFormat compressFormat;
29    private int quality;
30
31    public BitmapEncoder() {
32        this(null, DEFAULT_COMPRESSION_QUALITY);
33    }
34
35    public BitmapEncoder(Bitmap.CompressFormat compressFormat, int quality) {
36        this.compressFormat = compressFormat;
37        this.quality = quality;
38    }
39
40    @Override
41    public boolean encode(Resource<Bitmap> resource, OutputStream os) {
42        final Bitmap bitmap = resource.get();
43
44        long start = LogTime.getLogTime();
45        Bitmap.CompressFormat format = getFormat(bitmap);
46        bitmap.compress(format, quality, os);
47        if (Log.isLoggable(TAG, Log.VERBOSE)) {
48            Log.v(TAG, "Compressed with type: " + format + " of size " + Util.getBitmapByteSize(bitmap) + " in "
49                    + LogTime.getElapsedMillis(start));
50        }
51        return true;
52    }
53
54    @Override
55    public String getId() {
56        return "BitmapEncoder.com.bumptech.glide.load.resource.bitmap";
57    }
58
59    private Bitmap.CompressFormat getFormat(Bitmap bitmap) {
60        if (compressFormat != null) {
61            return compressFormat;
62        } else if (bitmap.hasAlpha()) {
63            return Bitmap.CompressFormat.PNG;
64        } else {
65            return Bitmap.CompressFormat.JPEG;
66        }
67    }
68
69}
70