/**
* Creates a bitmap from encoded JPEG bytes. Supports a partial JPEG image.
*
* @param encodedImage the encoded image with reference to the encoded bytes
* @param bitmapConfig the {@link android.graphics.Bitmap.Config} used to create the decoded
* Bitmap
* @param length the number of encoded bytes in the buffer
* @return the bitmap
* @exception java.lang.OutOfMemoryError if the Bitmap cannot be allocated
*/
@Override
public CloseableReference<Bitmap> decodeJPEGFromEncodedImage(
EncodedImage encodedImage, Bitmap.Config bitmapConfig, int length) {
boolean isJpegComplete = encodedImage.isCompleteAt(length);
final BitmapFactory.Options options = getDecodeOptionsForStream(encodedImage, bitmapConfig);
InputStream jpegDataStream = encodedImage.getInputStream();
// At this point the InputStream from the encoded image should not be null since in the
// pipeline,this comes from a call stack where this was checked before. Also this method needs
// the InputStream to decode the image so this can't be null.
Preconditions.checkNotNull(jpegDataStream);
if (encodedImage.getSize() > length) {
jpegDataStream = new LimitedInputStream(jpegDataStream, length);
}
if (!isJpegComplete) {
jpegDataStream = new TailAppendingInputStream(jpegDataStream, EOI_TAIL);
}
boolean retryOnFail = options.inPreferredConfig != Bitmap.Config.ARGB_8888;
try {
return decodeStaticImageFromStream(jpegDataStream, options);
} catch (RuntimeException re) {
if (retryOnFail) {
return decodeFromEncodedImage(encodedImage, Bitmap.Config.ARGB_8888);
}
throw re;
}
}
/**
* Creates a bitmap from encoded bytes.
*
* @param encodedImage the encoded image with a reference to the encoded bytes
* @param bitmapConfig the {@link android.graphics.Bitmap.Config} used to create the decoded
* Bitmap
* @return the bitmap
* @exception java.lang.OutOfMemoryError if the Bitmap cannot be allocated
*/
@Override
public CloseableReference<Bitmap> decodeFromEncodedImage(
EncodedImage encodedImage, Bitmap.Config bitmapConfig) {
final BitmapFactory.Options options = getDecodeOptionsForStream(encodedImage, bitmapConfig);
boolean retryOnFail = options.inPreferredConfig != Bitmap.Config.ARGB_8888;
try {
return decodeStaticImageFromStream(encodedImage.getInputStream(), options);
} catch (RuntimeException re) {
if (retryOnFail) {
return decodeFromEncodedImage(encodedImage, Bitmap.Config.ARGB_8888);
}
throw re;
}
}
/**
* Options returned by this method are configured with mDecodeBuffer which is GuardedBy("this")
*/
private static BitmapFactory.Options getDecodeOptionsForStream(
EncodedImage encodedImage, Bitmap.Config bitmapConfig) {
final BitmapFactory.Options options = new BitmapFactory.Options();
// Sample size should ONLY be different than 1 when downsampling is enabled in the pipeline
options.inSampleSize = encodedImage.getSampleSize();
options.inJustDecodeBounds = true;
// fill outWidth and outHeight
BitmapFactory.decodeStream(encodedImage.getInputStream(), null, options);
if (options.outWidth == -1 || options.outHeight == -1) {
throw new IllegalArgumentException();
}
options.inJustDecodeBounds = false;
options.inDither = true;
options.inPreferredConfig = bitmapConfig;
options.inMutable = true;
return options;
}
