@Override
    public boolean isCropSupported() {
        return true;
    }
This LuminanceSource implementation is meant for J2SE clients and our blackbox unit tests.

@author dswitkin@google.com (Daniel Switkin)
@author Sean Owen
@author code@elektrowolle.de (Wolfgang Jung)
src/main/java/io/github/biezhi/wechat/utils/BufferedImageLuminanceSource.java