net.ifok.png.compress

类 PngChunk

java.lang.Object

net.ifok.png.compress.PngChunk

public class PngChunk
extends Object

字段概要

字段

限定符和类型	字段和说明
static byte[]	IDAT
static byte[]	IEND
static byte[]	IHDR
static byte[]	PLTE
static byte[]	SIGNATURE
static byte[]	tRNS

构造器概要

构造器

构造器和说明
PngChunk(byte[] length, byte[] name, byte[] data)

方法概要

限定符和类型	方法和说明
static PngChunk	createDataChunk(byte[] zLibBytes)
static PngChunk	createEndChunk()
static PngChunk	createHeaderChunk(int width, int height, byte bitDepth, byte colorType, byte compression, byte filter, byte interlace) Create An Header Chunk for PNG
static PngChunk	createPaleteChunk(byte[] palBytes)
static PngChunk	createTrnsChunk(byte[] trnsBytes)
byte[]	getCRCValue()
byte[]	getData()
byte[]	getLength()
byte[]	getName()
static byte[]	intToBytes(int value)

从类继承的方法 java.lang.Object

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

字段详细资料

SIGNATURE

public static final byte[] SIGNATURE

IHDR

public static final byte[] IHDR

PLTE

public static final byte[] PLTE

tRNS

public static final byte[] tRNS

IDAT

public static final byte[] IDAT

IEND

public static final byte[] IEND

构造器详细资料

PngChunk

public PngChunk(byte[] length,
                byte[] name,
                byte[] data)

方法详细资料

createHeaderChunk

public static PngChunk createHeaderChunk(int width,
                                         int height,
                                         byte bitDepth,
                                         byte colorType,
                                         byte compression,
                                         byte filter,
                                         byte interlace)

Create An Header Chunk for PNG

参数:

width - image width

height - image height

bitDepth - valid values are 1,2,4,8 and 16

colorType - valid values are 0,2,3,4 and 6
Gray scale normal= color type 0 : allowed bit depths 1,2,4,8,16
RGB Triple normal= color type 2 : allowed bit depths 8,16
Palette index = color type 3 : allowed bit depths 1,2,4,8 (PLTE chunk must appear)
Gray scale Alpha = color type 4 : allowed bit depths 8,16 followed by alpha sample
RGB Triple Alpha = color type 6 : allowed bit depths 8,16 followed by alpha sample

compression - default is 0

filter - default is 0

interlace - 0 (no interlace) or 1 (Adam7 interlace). *

返回:

Header Chunk

createPaleteChunk

public static PngChunk createPaleteChunk(byte[] palBytes)

createTrnsChunk

public static PngChunk createTrnsChunk(byte[] trnsBytes)

createDataChunk

public static PngChunk createDataChunk(byte[] zLibBytes)

createEndChunk

public static PngChunk createEndChunk()

getCRCValue

public byte[] getCRCValue()

intToBytes

public static byte[] intToBytes(int value)

getLength

public byte[] getLength()

getName

public byte[] getName()

getData

public byte[] getData()