BufferedImageUtils.java 文件源码

/**
 * Gets the transparency of an image.
 *
 * @param image the image
 * @return OPAQUE, BITMASK or TRANSLUCENT (see java.awt.Transparency)
 */
public static int getTransparency( Image image ) {
    // If buffered image, the color model is readily available
    if ( image instanceof BufferedImage ) {
        BufferedImage bimage = (BufferedImage) image;
        return bimage.getColorModel().getTransparency();
    }
    // Use a pixel grabber to retrieve the image's color model;
    // grabbing a single pixel is usually sufficient
    PixelGrabber pg = new PixelGrabber( image, 0, 0, 1, 1, false );
    try {
        pg.grabPixels();
    }
    catch ( InterruptedException e ) {
    }

    // Get the image's color model
    ColorModel cm = pg.getColorModel();

    int transparency = Transparency.OPAQUE;
    if ( cm != null ) {
        transparency = cm.getTransparency();
    }
    return transparency;
}