org.apache.pdfbox.pdmodel.graphics.predictor: public class: Up

org.apache.pdfbox.pdmodel.graphics.predictor
public class: Up [javadoc | source]

java.lang.Object
   org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm
      org.apache.pdfbox.pdmodel.graphics.predictor.Up

The up algorithm. Up(i,j) = Raw(i,j) - Raw(i,j-1) Raw(i,j) = Up(i,j) + Raw(i,j-1)

author: xylifyx - @yahoo.co.uk

version: $ - Revision: 1.3 $

Method from org.apache.pdfbox.pdmodel.graphics.predictor.Up Summary:
decodeLine, encodeLine

Methods from org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm:
aboveLeftPixel, abovePixel, checkBufsiz, decode, decodeLine, encode, encodeLine, getBpp, getFilter, getHeight, getWidth, leftPixel, main, setBpp, setHeight, setWidth

Methods from java.lang.Object:
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from org.apache.pdfbox.pdmodel.graphics.predictor.Up Detail:
public void decodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) { // case: y = 0; int bpl = getWidth()*getBpp(); if (destOffset - destDy < 0) { if (0 < getHeight()) { for (int x = 0; x < bpl; x++) { dest[destOffset + x] = src[srcOffset + x]; } } } else { for (int x = 0; x < bpl; x++) { dest[destOffset + x] = (byte) (src[srcOffset + x] + dest[destOffset + x - destDy]); } } } {@inheritDoc}
public void encodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) { int bpl = getWidth()*getBpp(); // case: y = 0; if (srcOffset - srcDy < 0) { if (0 < getHeight()) { for (int x = 0; x < bpl; x++) { dest[destOffset + x] = src[srcOffset + x]; } } } else { for (int x = 0; x < bpl; x++) { dest[destOffset + x] = (byte) (src[srcOffset + x] - src[srcOffset + x - srcDy]); } } } {@inheritDoc}

Method from org.apache.pdfbox.pdmodel.graphics.predictor.Up Detail:

 public  void decodeLine(byte[] src,
    byte[] dest,
    int srcDy,
    int srcOffset,
    int destDy,
    int destOffset) {
        // case: y = 0;
        int bpl = getWidth()*getBpp();
        if (destOffset - destDy <  0)
        {
            if (0 <  getHeight())
            {
                for (int x = 0; x <  bpl; x++)
                {
                    dest[destOffset + x] = src[srcOffset + x];
                }
            }
        }
        else
        {
            for (int x = 0; x <  bpl; x++)
            {
                dest[destOffset + x] = (byte) (src[srcOffset + x] + dest[destOffset
                        + x - destDy]);
            }
        }
}

{@inheritDoc}

 public  void encodeLine(byte[] src,
    byte[] dest,
    int srcDy,
    int srcOffset,
    int destDy,
    int destOffset) {
        int bpl = getWidth()*getBpp();
        // case: y = 0;
        if (srcOffset - srcDy <  0)
        {
            if (0 <  getHeight())
            {
                for (int x = 0; x <  bpl; x++)
                {
                    dest[destOffset + x] = src[srcOffset + x];
                }
            }
        }
        else
        {
            for (int x = 0; x <  bpl; x++)
            {
                dest[destOffset + x] = (byte) (src[srcOffset + x] - src[srcOffset
                        + x - srcDy]);
            }
        }
}

{@inheritDoc}