org.jmol.image

Class JpgEncoder

java.lang.Object

org.jmol.image.ImageEncoder

org.jmol.image.JpgEncoder

All Implemented Interfaces:

JmolImageEncoder

Direct Known Subclasses:

Jpg64Encoder

public class JpgEncoder
extends ImageEncoder

JpegEncoder - The JPEG main program which performs a jpeg compression of an image. A system to allow the full Jmol state -- regardless of length -- to be encoded in a set of APP1 (FFE1) tags. But we have to be careful about line ends for backward compatibility. This solution is not 100% effective, because some data lines may in principle be Very large and may not contain new lines for more than 65500 characters, But that would be very unusual. Perhaps a huge data set loaded from a string. Introduced in Jmol 12.1.36. Bob Hanson See org.com.obrador.license.txt

Field Summary

Fields

Modifier and Type	Field and Description
private static int	CONTINUE_MAX
private static int	CONTINUE_MAX_BUFFER
private DCT	dct
protected int	defaultQuality
private static byte[]	eoi
private Huffman	huf
private static byte[]	jfif
private JpegObj	jpegObj
private static byte[]	soi

Fields inherited from class org.jmol.image.ImageEncoder

date, errRet, height, out, pixels, quality, width

Constructor Summary

Constructors

Constructor and Description
JpgEncoder()

Method Summary

Modifier and Type	Method and Description
protected void	generate()
protected void	setParams(Map<String,Object> params)
(package private) void	writeArray(byte[] data)
private void	writeCompressedData(JpegObj jpegObj, DCT dct, Huffman huf)
(package private) void	WriteDHTHeader(int[] bits, int[] val)
private String	writeHeaders(JpegObj jpegObj, DCT dct)
(package private) void	writeMarker(byte[] data)
private void	writeString(String s, byte id)
private void	writeTag(int length, byte id)

Methods inherited from class org.jmol.image.ImageEncoder

close, createImage, encodeImage, putByte, putString

Methods inherited from class java.lang.Object

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

Field Detail

CONTINUE_MAX

private static final int CONTINUE_MAX

See Also:

Constant Field Values

CONTINUE_MAX_BUFFER

private static final int CONTINUE_MAX_BUFFER

See Also:

Constant Field Values

jpegObj

private JpegObj jpegObj

huf

private Huffman huf

dct

private DCT dct

defaultQuality

protected int defaultQuality

eoi

private static byte[] eoi

jfif

private static byte[] jfif

soi

private static byte[] soi

Constructor Detail

JpgEncoder

public JpgEncoder()

Method Detail

setParams

protected void setParams(Map<String,Object> params)

Specified by:

setParams in class ImageEncoder

generate

protected void generate()
                 throws IOException

Specified by:

generate in class ImageEncoder

Throws:

IOException

writeCompressedData

private void writeCompressedData(JpegObj jpegObj,
                                 DCT dct,
                                 Huffman huf)

writeHeaders

private String writeHeaders(JpegObj jpegObj,
                            DCT dct)

writeString

private void writeString(String s,
                         byte id)

writeTag

private void writeTag(int length,
                      byte id)

WriteDHTHeader

void WriteDHTHeader(int[] bits,
                    int[] val)

writeMarker

void writeMarker(byte[] data)

writeArray

void writeArray(byte[] data)