JPEGImageReader.java 文件源码

public ImageTypeSpecifier getRawImageType(int imageIndex)
    throws IOException {
    setThreadLock();
    try {
        if (currentImage != imageIndex) {
            cbLock.check();

            readHeader(imageIndex, true);
        }

        // Returns null if it can't be represented
        return getImageType(colorSpaceCode).getType();
    } finally {
        clearThreadLock();
    }
}