@Nullable
private GifDrawableResource decode(
ByteBuffer byteBuffer, int width, int height, GifHeaderParser parser, Options options) {
long startTime = LogTime.getLogTime();
try {
final GifHeader header = parser.parseHeader();
if (header.getNumFrames() <= 0 || header.getStatus() != GifDecoder.STATUS_OK) {
return null;
}
Bitmap.Config config = options.get(GifOptions.DECODE_FORMAT) == DecodeFormat.PREFER_RGB_565
? Bitmap.Config.RGB_565 : Bitmap.Config.ARGB_8888;
int sampleSize = getSampleSize(header, width, height);
GifDecoder gifDecoder = gifDecoderFactory.build(provider, header, byteBuffer, sampleSize);
gifDecoder.setDefaultBitmapConfig(config);
gifDecoder.advance();
Bitmap firstFrame = gifDecoder.getNextFrame();
if (firstFrame == null) {
return null;
}
Transformation<Bitmap> unitTransformation = UnitTransformation.get();
GifDrawable gifDrawable =
new GifDrawable(context, gifDecoder, unitTransformation, width, height, firstFrame);
return new GifDrawableResource(gifDrawable);
} finally {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Decoded GIF from stream in " + LogTime.getElapsedMillis(startTime));
}
}
}