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nextapp.echoservlet.image
Class PngEncoder  

java.lang.Object
  nextapp.echoservlet.image.PngEncoder

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public class PngEncoder

extends java.lang.Object

Encodes a java.awt.Image into PNG format. For more information on the PNG specification, see the W3C PNG page at http://www.w3.org/TR/REC-png.html.

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Nested Class Summary
private static class	PngEncoder.AverageFilter           An implementation of an "Average" filter.
private  class	PngEncoder.ByteTranslator           Translates byte-based rasters.
static interface	PngEncoder.Filter           An interface for PNG filters.
private  class	PngEncoder.IntTranslator           Translates integer-based rasters.
private static class	PngEncoder.PaethFilter           An implementation of a "Paeth" filter.
private static class	PngEncoder.SubFilter           An implementation of a "Sub" filter.
(package private) static interface	PngEncoder.Translator           An interface for translators, which translate pixel data from a writable raster into an R/G/B/A ordering required by the PNG specification.
private static class	PngEncoder.UpFilter           An implementation of an "Up" filter.

 

Field Summary
static PngEncoder.Filter	AVERAGE_FILTER
private static int	AVERAGE_FILTER_TYPE
private static byte	BIT_DEPTH
private static byte	COLOR_TYPE_INDEXED
private static byte	COLOR_TYPE_RGB
private static byte	COLOR_TYPE_RGBA
private  int	compressionLevel
private  boolean	encodeAlpha
private  PngEncoder.Filter	filter
private  int	height
private static byte[]	IDAT
private static byte[]	IEND
private static byte[]	IHDR
private  java.awt.image.BufferedImage	image
private  int	inputBpp
private static int[]	INT_TRANSLATOR_CHANNEL_MAP
private  int	outputBpp
static PngEncoder.Filter	PAETH_FILTER
private static int	PAETH_FILTER_TYPE
private static byte[]	PLTE
private  java.awt.image.Raster	raster
private static byte[]	SIGNATURE
static PngEncoder.Filter	SUB_FILTER
private static int	SUB_FILTER_TYPE
private  int	transferType
private  PngEncoder.Translator	translator
static PngEncoder.Filter	UP_FILTER
private static int	UP_FILTER_TYPE
private  int	width

 

Constructor Summary

PngEncoder(java.awt.Image image, boolean encodeAlpha, PngEncoder.Filter filter, int compressionLevel)           Creates a PNG encoder for an image.

 

Method Summary
void	encode(java.io.OutputStream out)           Encodes the image.
private  void	writeIdatChunks(java.io.OutputStream out, java.util.zip.Checksum csum)           Writes the IDAT (Image data) chunks to the output stream.
private  void	writeIendChunk(java.io.OutputStream out, java.util.zip.Checksum csum)           Writes the IEND (End-of-file) chunk to the output stream.
private  void	writeIhdrChunk(java.io.OutputStream out, java.util.zip.Checksum csum)           Writes the IHDR (Image Header) chunk to the output stream.
private static void	writeInt(java.io.OutputStream out, int i)           Writes an 32-bit integer value to the output stream.
private  void	writePlteChunk(java.io.OutputStream out, java.util.zip.Checksum csum)           Writes the PLTE (Palette) chunk to the output stream.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

SUB_FILTER

public static final PngEncoder.Filter SUB_FILTER

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UP_FILTER

public static final PngEncoder.Filter UP_FILTER

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AVERAGE_FILTER

public static final PngEncoder.Filter AVERAGE_FILTER

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PAETH_FILTER

public static final PngEncoder.Filter PAETH_FILTER

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SIGNATURE

private static final byte[] SIGNATURE

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IHDR

private static final byte[] IHDR

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PLTE

private static final byte[] PLTE

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IDAT

private static final byte[] IDAT

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IEND

private static final byte[] IEND

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SUB_FILTER_TYPE

private static final int SUB_FILTER_TYPE

See Also:

Constant Field Values

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UP_FILTER_TYPE

private static final int UP_FILTER_TYPE

See Also:

Constant Field Values

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AVERAGE_FILTER_TYPE

private static final int AVERAGE_FILTER_TYPE

See Also:

Constant Field Values

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PAETH_FILTER_TYPE

private static final int PAETH_FILTER_TYPE

See Also:

Constant Field Values

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BIT_DEPTH

private static final byte BIT_DEPTH

See Also:

Constant Field Values

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COLOR_TYPE_INDEXED

private static final byte COLOR_TYPE_INDEXED

See Also:

Constant Field Values

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COLOR_TYPE_RGB

private static final byte COLOR_TYPE_RGB

See Also:

Constant Field Values

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COLOR_TYPE_RGBA

private static final byte COLOR_TYPE_RGBA

See Also:

Constant Field Values

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INT_TRANSLATOR_CHANNEL_MAP

private static final int[] INT_TRANSLATOR_CHANNEL_MAP

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image

private java.awt.image.BufferedImage image

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encodeAlpha

private boolean encodeAlpha

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filter

private PngEncoder.Filter filter

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compressionLevel

private int compressionLevel

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width

private int width

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height

private int height

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transferType

private int transferType

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raster

private java.awt.image.Raster raster

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inputBpp

private int inputBpp

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outputBpp

private int outputBpp

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translator

private PngEncoder.Translator translator

Constructor Detail

PngEncoder

public PngEncoder(java.awt.Image image,
                  boolean encodeAlpha,
                  PngEncoder.Filter filter,
                  int compressionLevel)

Creates a PNG encoder for an image.

Method Detail

writeInt

private static void writeInt(java.io.OutputStream out,
                             int i)
                      throws java.io.IOException

Writes an 32-bit integer value to the output stream.

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encode

public void encode(java.io.OutputStream out)
            throws java.io.IOException

Encodes the image.

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writeIdatChunks

private void writeIdatChunks(java.io.OutputStream out,
                             java.util.zip.Checksum csum)
                      throws java.io.IOException

Writes the IDAT (Image data) chunks to the output stream.

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writeIendChunk

private void writeIendChunk(java.io.OutputStream out,
                            java.util.zip.Checksum csum)
                     throws java.io.IOException

Writes the IEND (End-of-file) chunk to the output stream.

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writeIhdrChunk

private void writeIhdrChunk(java.io.OutputStream out,
                            java.util.zip.Checksum csum)
                     throws java.io.IOException

Writes the IHDR (Image Header) chunk to the output stream.

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writePlteChunk

private void writePlteChunk(java.io.OutputStream out,
                            java.util.zip.Checksum csum)
                     throws java.io.IOException

Writes the PLTE (Palette) chunk to the output stream.

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