Java Primer Plus/Java Primer Plus (Waite Group Proess)(1996).iso/java_Win/demo/ImageTest/AlphaFilter.class

Java Class File | 1995-10-12 | 769 b | 20 lines

import java.awt.image.ColorModel;
import java.awt.image.RGBImageFilter;

class AlphaFilter extends RGBImageFilter {
   ColorModel origmodel;
   ColorModel newmodel;
   int alphaval;

   public AlphaFilter(int alpha) {
      this.alphaval = alpha;
      super.canFilterIndexColorModel = true;
   }

   public int filterRGB(int x, int y, int rgb) {
      int alpha = rgb >> 24 & 255;
      alpha = alpha * this.alphaval / 255;
      return rgb & 16777215 | alpha << 24;
   }
}