GenericImageSinglePassIterator.java 文件源码

/** Returns a <code>GenericImageSinglePassIterator</code> that is
 * either a <code>IntPixelIterator</code> or a <code>BytePixelIterator</code>.
 * @param image the image to iterate over.
 * @param iteratorType one of these 8 BufferedImage types:
 * TYPE_INT_ARGB, TYPE_INT_ARGB_PRE, TYPE_INT_RGB, TYPE_INT_BGR,
 * TYPE_3BYTE_BGR, TYPE_BYTE_GRAY, TYPE_4BYTE_ABGR, TYPE_4BYTE_ABGR_PRE.
 * @return a <code>GenericImageSinglePassIterator</code> for the image provided.
 */
public static GenericImageSinglePassIterator get(Image image,int iteratorType) {
    if(!(iteratorType==BufferedImage.TYPE_INT_ARGB ||
            iteratorType==BufferedImage.TYPE_INT_ARGB_PRE ||
            iteratorType==BufferedImage.TYPE_INT_RGB ||
            iteratorType==BufferedImage.TYPE_INT_BGR ||
            iteratorType==BufferedImage.TYPE_3BYTE_BGR ||
            iteratorType==BufferedImage.TYPE_BYTE_GRAY ||
            iteratorType==BufferedImage.TYPE_4BYTE_ABGR ||
            iteratorType==BufferedImage.TYPE_4BYTE_ABGR_PRE)) {
        throw new IllegalArgumentException("illegal iterator type: "+iteratorType);
    }
    final ImageProducer producer = image.getSource();
    final Consumer consumer = new Consumer(producer, iteratorType);
    // ImageProducer.startProduction often starts its own thread, but it's not
    // required to.  Sometimes in my testing a BufferedImage would make
    // this a blocking call.  So to be safe this call should be in its
    // own thread:
    Thread productionThread = new Thread("GenericImageSinglePassIterator: Production Thread") {
        @Override
        public void run() {
            producer.startProduction(consumer);
        }
    };
    productionThread.start();
    return consumer.getPixelIterator();
}