Package com.tom_roush.pdfbox.pdmodel.graphics.predictor

Class Sub

java.lang.Object

com.tom_roush.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm

com.tom_roush.pdfbox.pdmodel.graphics.predictor.Sub

public class Sub
extends PredictorAlgorithm

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

Constructor Summary

Constructors

Constructor	Description
Sub()

Method Summary

Modifier and Type	Method	Description
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 java.lang.Object

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

Methods inherited from class com.tom_roush.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm

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

Constructor Detail

Sub

public Sub()

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