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package imaging.filters;
import java.awt.image.*;
/**
* A derivation of RGBImageFilter that partially or wholly
* dissolves an image.<p>
*
* Extent of dissolving is set by the setOpacity(int) method,
* which is passed an integer between 0 and 255 (inclusive).
* The integer represents the alpha value to be applied to
* every color in the image.<p>
*
* An alpha value of 255 signifies an opaque color, while an
* alpha value of 0 signifies a translucent color.<p>
*
* @version 1.0, Apr 1 1996
* @author David Geary
* @see RGBImageFilter
*/
public class DissolveFilter extends RGBImageFilter implements MedFilter
{
private int opacity;
public DissolveFilter() {
this(0);
}
public DissolveFilter(int opacity) {
canFilterIndexColorModel = true;
setOpacity(opacity);
}
public String info ()
{
return "Dissolves an image";
}
public void setOpacity(int opacity) {
Assert.notFalse(opacity >= 0 && opacity <= 255);
this.opacity = opacity;
}
public int filterRGB(int x, int y, int rgb) {
DirectColorModel cm =
(DirectColorModel)ColorModel.getRGBdefault();
int alpha = cm.getAlpha(rgb);
int red = cm.getRed (rgb);
int green = cm.getGreen(rgb);
int blue = cm.getBlue (rgb);
alpha = opacity;
return alpha << 24 | red << 16 | green << 8 | blue;
}
}
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