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org.ydp.jai
Class PNGImageEncoder  

java.lang.Object
  org.ydp.jai.ImageEncoderImpl
      org.ydp.jai.PNGImageEncoder

All Implemented Interfaces:

ImageEncoder

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public class PNGImageEncoder

extends ImageEncoderImpl

An ImageEncoder for the PNG file format.

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Field Summary
private  byte[]	alphaPalette
private  int	bitDepth
private  int	bitShift
private  byte[]	bluePalette
private  int	bpp
private  int	colorType
private  boolean	compressGray
private  byte[]	currRow
private  java.io.DataOutputStream	dataOutput
private  byte[][]	expandBits
private  byte[][]	filteredRows
private  byte[]	greenPalette
private  int	height
private  java.awt.image.RenderedImage	image
private  boolean	interlace
private static byte[]	magic
private  int	numBands
private  PNGEncodeParam	param
private static int	PNG_COLOR_GRAY
private static int	PNG_COLOR_GRAY_ALPHA
private static int	PNG_COLOR_PALETTE
private static int	PNG_COLOR_RGB
private static int	PNG_COLOR_RGB_ALPHA
private  byte[]	prevRow
private  byte[]	redPalette
private  boolean	skipAlpha
private static float[]	srgbChroma
private  int	width

 

Fields inherited from class org.ydp.jai.ImageEncoderImpl

output

 

Constructor Summary

PNGImageEncoder(java.io.OutputStream output, PNGEncodeParam param)

 

Method Summary
private static int	clamp(int val, int maxValue)
private  PNGEncodeParam.Gray	createGrayParam(byte[] redPalette, byte[] greenPalette, byte[] bluePalette, byte[] alphaPalette)           Analyzes a set of palettes and determines if it can be expressed as a standard set of gray values, with zero or one values being fully transparent and the rest being fully opaque.
void	encode(java.awt.image.RenderedImage im)           Encodes a RenderedImage and writes the output to the OutputStream associated with this ImageEncoder.
private  void	encodePass(java.io.OutputStream os, java.awt.image.Raster ras, int xOffset, int yOffset, int xSkip, int ySkip)
private  void	writeBKGD()
private  void	writeCHRM()
private  void	writeGAMA()
private  void	writeHIST()
private  void	writeICCP()
private  void	writeIDAT()
private  void	writeIEND()
private  void	writeIHDR()
private  void	writeMagic()
private  void	writePHYS()
private  void	writePLTE()
private  void	writePrivateChunks()
private  void	writeSBIT()
private  void	writeSPLT()
private  void	writeSRGB()
private  void	writeTEXT()
private  void	writeTIME()
private  void	writeTRNS()
private  void	writeZTXT()

 

Methods inherited from class org.ydp.jai.ImageEncoderImpl

encode, getOutputStream, getParam, setParam

 

Methods inherited from class java.lang.Object

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

 

Field Detail

PNG_COLOR_GRAY

private static final int PNG_COLOR_GRAY

See Also:

Constant Field Values

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PNG_COLOR_RGB

private static final int PNG_COLOR_RGB

See Also:

Constant Field Values

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PNG_COLOR_PALETTE

private static final int PNG_COLOR_PALETTE

See Also:

Constant Field Values

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PNG_COLOR_GRAY_ALPHA

private static final int PNG_COLOR_GRAY_ALPHA

See Also:

Constant Field Values

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PNG_COLOR_RGB_ALPHA

private static final int PNG_COLOR_RGB_ALPHA

See Also:

Constant Field Values

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magic

private static final byte[] magic

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param

private PNGEncodeParam param

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image

private java.awt.image.RenderedImage image

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width

private int width

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height

private int height

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bitDepth

private int bitDepth

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bitShift

private int bitShift

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numBands

private int numBands

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colorType

private int colorType

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bpp

private int bpp

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skipAlpha

private boolean skipAlpha

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compressGray

private boolean compressGray

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interlace

private boolean interlace

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redPalette

private byte[] redPalette

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greenPalette

private byte[] greenPalette

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bluePalette

private byte[] bluePalette

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alphaPalette

private byte[] alphaPalette

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dataOutput

private java.io.DataOutputStream dataOutput

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prevRow

private byte[] prevRow

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currRow

private byte[] currRow

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filteredRows

private byte[][] filteredRows

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srgbChroma

private static final float[] srgbChroma

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expandBits

private final byte[][] expandBits

Constructor Detail

PNGImageEncoder

public PNGImageEncoder(java.io.OutputStream output,
                       PNGEncodeParam param)

Method Detail

writeMagic

private void writeMagic()
                 throws java.io.IOException

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writeIHDR

private void writeIHDR()
                throws java.io.IOException

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clamp

private static int clamp(int val,
                         int maxValue)

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encodePass

private void encodePass(java.io.OutputStream os,
                        java.awt.image.Raster ras,
                        int xOffset,
                        int yOffset,
                        int xSkip,
                        int ySkip)
                 throws java.io.IOException

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writeIDAT

private void writeIDAT()
                throws java.io.IOException

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writeIEND

private void writeIEND()
                throws java.io.IOException

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writeCHRM

private void writeCHRM()
                throws java.io.IOException

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writeGAMA

private void writeGAMA()
                throws java.io.IOException

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writeICCP

private void writeICCP()
                throws java.io.IOException

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writeSBIT

private void writeSBIT()
                throws java.io.IOException

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writeSRGB

private void writeSRGB()
                throws java.io.IOException

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writePLTE

private void writePLTE()
                throws java.io.IOException

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writeBKGD

private void writeBKGD()
                throws java.io.IOException

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writeHIST

private void writeHIST()
                throws java.io.IOException

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writeTRNS

private void writeTRNS()
                throws java.io.IOException

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writePHYS

private void writePHYS()
                throws java.io.IOException

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writeSPLT

private void writeSPLT()
                throws java.io.IOException

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writeTIME

private void writeTIME()
                throws java.io.IOException

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writeTEXT

private void writeTEXT()
                throws java.io.IOException

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writeZTXT

private void writeZTXT()
                throws java.io.IOException

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writePrivateChunks

private void writePrivateChunks()
                         throws java.io.IOException

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createGrayParam

private PNGEncodeParam.Gray createGrayParam(byte[] redPalette,
                                            byte[] greenPalette,
                                            byte[] bluePalette,
                                            byte[] alphaPalette)

Analyzes a set of palettes and determines if it can be expressed as a standard set of gray values, with zero or one values being fully transparent and the rest being fully opaque. If it is possible to express the data thusly, the method returns a suitable instance of PNGEncodeParam.Gray; otherwise it returns null.

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encode

public void encode(java.awt.image.RenderedImage im)
            throws java.io.IOException

Description copied from class: ImageEncoderImpl

Encodes a RenderedImage and writes the output to the OutputStream associated with this ImageEncoder.

Specified by:

encode in interface ImageEncoder

Specified by:

encode in class ImageEncoderImpl

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