Module java.desktop
Package java.awt.image

Class PixelGrabber

java.lang.Object
java.awt.image.PixelGrabber
All Implemented Interfaces:
ImageConsumer
public class PixelGrabber extends Object implements ImageConsumer
The PixelGrabber class implements an ImageConsumer which can be attached to an Image or ImageProducer object to retrieve a subset of the pixels in that image. Here is an example: 


 public void handlesinglepixel(int x, int y, int pixel) {
      int alpha = (pixel >> 24) & 0xff;
      int red   = (pixel >> 16) & 0xff;
      int green = (pixel >>  8) & 0xff;
      int blue  = (pixel      ) & 0xff;
      // Deal with the pixel as necessary...
 }

 public void handlepixels(Image img, int x, int y, int w, int h) {
      int[] pixels = new int[w * h];
      PixelGrabber pg = new PixelGrabber(img, x, y, w, h, pixels, 0, w);
      try {
          pg.grabPixels();
      } catch (InterruptedException e) {
          System.err.println("interrupted waiting for pixels!");
          return;
      }
      if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
          System.err.println("image fetch aborted or errored");
          return;
      }
      for (int j = 0; j < h; j++) {
          for (int i = 0; i < w; i++) {
              handlesinglepixel(x+i, y+j, pixels[j * w + i]);
          }
      }
 }
See Also: