How to use

paethPredictor

method

in

org.apache.batik.ext.awt.image.codec.png.PNGEncodeParam

private static void decodePaethFilter(byte[] curr, byte[] prev,
                   int count, int bpp) {
  int raw, priorPixel, priorRow, priorRowPixel;
  for (int i = 0; i < bpp; i++) {
    raw = curr[i] & 0xff;
    priorRow = prev[i] & 0xff;
    curr[i] = (byte)(raw + priorRow);
  }
  for (int i = bpp; i < count; i++) {
    raw = curr[i] & 0xff;
    priorPixel = curr[i - bpp] & 0xff;
    priorRow = prev[i] & 0xff;
    priorRowPixel = prev[i - bpp] & 0xff;
    curr[i] = (byte)(raw + PNGEncodeParam.paethPredictor(priorPixel,
                       priorRow,
                       priorRowPixel));
  }
}

private static void decodePaethFilter(byte[] curr, byte[] prev,
                   int count, int bpp) {
  int raw, priorPixel, priorRow, priorRowPixel;
  for (int i = 0; i < bpp; i++) {
    raw = curr[i] & 0xff;
    priorRow = prev[i] & 0xff;
    curr[i] = (byte)(raw + priorRow);
  }
  for (int i = bpp; i < count; i++) {
    raw = curr[i] & 0xff;
    priorPixel = curr[i - bpp] & 0xff;
    priorRow = prev[i] & 0xff;
    priorRowPixel = prev[i - bpp] & 0xff;
    curr[i] = (byte)(raw + PNGEncodeParam.paethPredictor(priorPixel,
                       priorRow,
                       priorRowPixel));
  }
}

private static void decodePaethFilter(byte[] curr, byte[] prev,
                   int count, int bpp) {
  int raw, priorPixel, priorRow, priorRowPixel;
  for (int i = 0; i < bpp; i++) {
    raw = curr[i] & 0xff;
    priorRow = prev[i] & 0xff;
    curr[i] = (byte)(raw + priorRow);
  }
  for (int i = bpp; i < count; i++) {
    raw = curr[i] & 0xff;
    priorPixel = curr[i - bpp] & 0xff;
    priorRow = prev[i] & 0xff;
    priorRowPixel = prev[i - bpp] & 0xff;
    curr[i] = (byte)(raw + PNGEncodeParam.paethPredictor(priorPixel,
                       priorRow,
                       priorRowPixel));
  }
}

private static void decodePaethFilter(byte[] curr, byte[] prev,
                   int count, int bpp) {
  int raw, priorPixel, priorRow, priorRowPixel;
  for (int i = 0; i < bpp; i++) {
    raw = curr[i] & 0xff;
    priorRow = prev[i] & 0xff;
    curr[i] = (byte)(raw + priorRow);
  }
  for (int i = bpp; i < count; i++) {
    raw = curr[i] & 0xff;
    priorPixel = curr[i - bpp] & 0xff;
    priorRow = prev[i] & 0xff;
    priorRowPixel = prev[i - bpp] & 0xff;
    curr[i] = (byte)(raw + PNGEncodeParam.paethPredictor(priorPixel,
                       priorRow,
                       priorRowPixel));
  }
}