Package org.apache.pdfbox.pdmodel.graphics.predictor

Class Optimum

java.lang.Object
org.apache.pdfbox.pdmodel.graphics.predictor.PredictorAlgorithm
org.apache.pdfbox.pdmodel.graphics.predictor.Optimum
public class Optimum extends PredictorAlgorithm
In an Uptimum encoded image, each line takes up width*bpp+1 bytes. The first byte holds a number that signifies which algorithm encoded the line.
Version:
$Revision: 1.1 $
Author:
xylifyx@yahoo.co.uk

  • Constructor Summary

    Constructors
    Constructor
    Description
    Optimum()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    checkBufsiz(byte[] filtered, byte[] raw)
    check that buffer sizes matches width,height,bpp.
    void
    decode(byte[] src, byte[] dest)
    decode a byte array full of image data using the filter that this object implements.
    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
    encode(byte[] src, byte[] dest)
    encode a byte array full of image data using the filter that this object implements.
    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.
    void
    setBpp(int bpp)
    void
    setHeight(int height)
    void
    setWidth(int width)

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

    aboveLeftPixel, abovePixel, getBpp, getFilter, getHeight, getWidth, leftPixel, main

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Optimum

      public Optimum()

  • Method Details

    • checkBufsiz

      public void checkBufsiz(byte[] filtered, byte[] raw)
      check that buffer sizes matches width,height,bpp. This implementation is used by most of the filters, but not Uptimum.
      Overrides:
      checkBufsiz in class PredictorAlgorithm
      Parameters:
      filtered - The source buffer.
      raw - The destination buffer.

    • 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

    • encode

      public void encode(byte[] src, byte[] dest)
      encode a byte array full of image data using the filter that this object implements.
      Overrides:
      encode in class PredictorAlgorithm
      Parameters:
      src - buffer
      dest - buffer

    • setBpp

      public void setBpp(int bpp)
      Overrides:
      setBpp in class PredictorAlgorithm
      Parameters:
      bpp - The bpp to set.

    • setHeight

      public void setHeight(int height)
      Overrides:
      setHeight in class PredictorAlgorithm
      Parameters:
      height - The height to set.

    • setWidth

      public void setWidth(int width)
      Overrides:
      setWidth in class PredictorAlgorithm
      Parameters:
      width - The width to set.

    • decode

      public void decode(byte[] src, byte[] dest)
      decode a byte array full of image data using the filter that this object implements.
      Overrides:
      decode in class PredictorAlgorithm
      Parameters:
      src - buffer
      dest - buffer