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

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

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

The sub algorithm. Sub(i,j) = Raw(i,j) - Raw(i-1,j) Raw(i,j) = Sub(i,j) + Raw(i-1,j)

author: xylifyx - @yahoo.co.uk

version: $ - Revision: 1.3 $

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

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

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

{@inheritDoc}

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

{@inheritDoc}