org.apache.pdfbox.pdmodel.graphics.predictor
Class Up

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

public class Up
extends PredictorAlgorithm

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

Version:

$Revision: 1.3 $

Author:

[email protected]

Constructor Summary

Up()

Method Summary

void	decodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) decode line of pixel data in src from src_offset and width*bpp bytes forward, put the decoded bytes into dest.
void	encodeLine(byte[] src, byte[] dest, int srcDy, int srcOffset, int destDy, int destOffset) encode line of pixel data in src from srcOffset and width*bpp bytes forward, put the decoded bytes into dest.

Methods inherited from class org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm

aboveLeftPixel, abovePixel, checkBufsiz, decode, encode, getBpp, getFilter, getHeight, getWidth, leftPixel, main, setBpp, setHeight, setWidth

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Up

public Up()

Method Detail

encodeLine

public void encodeLine(byte[] src,
                       byte[] dest,
                       int srcDy,
                       int srcOffset,
                       int destDy,
                       int destOffset)

encode line of pixel data in src from srcOffset and width*bpp bytes forward, put the decoded bytes into dest.

Specified by:

encodeLine in class PredictorAlgorithm

Parameters:

src - raw image data

dest - encoded data

srcDy - byte offset between lines

srcOffset - beginning of line data

destDy - byte offset between lines

destOffset - beginning of line data

decodeLine

public void decodeLine(byte[] src,
                       byte[] dest,
                       int srcDy,
                       int srcOffset,
                       int destDy,
                       int destOffset)

decode line of pixel data in src from src_offset and width*bpp bytes forward, put the decoded bytes into dest.

Specified by:

decodeLine in class PredictorAlgorithm

Parameters:

src - encoded image data

dest - raw data

srcDy - byte offset between lines

srcOffset - beginning of line data

destDy - byte offset between lines

destOffset - beginning of line data