Class PngWriter

java.lang.Object

com.itextpdf.io.codec.PngWriter

public class PngWriter
extends Object

Writes a PNG image.

Field Summary

Fields

Modifier and Type	Field	Description
private static int[]	crc_table
private static final byte[]	iCCP
private static final byte[]	IDAT
private static final byte[]	IEND
private static final byte[]	IHDR
private OutputStream	outp
private static final byte[]	PLTE
private static final byte[]	PNG_SIGNTURE

Constructor Summary

Constructors

Constructor	Description
PngWriter(OutputStream outp)

Method Summary

Modifier and Type	Method	Description
private static int	crc(byte[] buf)
private static int	crc(byte[] buf, int offset, int len)
private static void	make_crc_table()
void	outputInt(int n)
static void	outputInt(int n, OutputStream s)
private static int	update_crc(int crc, byte[] buf, int offset, int len)
void	writeChunk(byte[] chunkType, byte[] data)
void	writeData(byte[] data, int stride)
void	writeEnd()
void	writeHeader(int width, int height, int bitDepth, int colorType)
void	writeIccProfile(byte[] data)
void	writePalette(byte[] data)

Methods inherited from class Object

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

Field Details

PNG_SIGNTURE

private static final byte[] PNG_SIGNTURE

IHDR

private static final byte[] IHDR

PLTE

private static final byte[] PLTE

IDAT

private static final byte[] IDAT

IEND

private static final byte[] IEND

iCCP

private static final byte[] iCCP

crc_table

private static int[] crc_table

outp

private OutputStream outp

Constructor Details

PngWriter

public PngWriter(OutputStream outp)
          throws IOException

Throws:

IOException

Method Details

writeHeader

public void writeHeader(int width,
 int height,
 int bitDepth,
 int colorType)
                 throws IOException

Throws:

IOException

writeEnd

public void writeEnd()
              throws IOException

Throws:

IOException

writeData

public void writeData(byte[] data,
 int stride)
               throws IOException

Throws:

IOException

writePalette

public void writePalette(byte[] data)
                  throws IOException

Throws:

IOException

writeIccProfile

public void writeIccProfile(byte[] data)
                     throws IOException

Throws:

IOException

make_crc_table

private static void make_crc_table()

update_crc

private static int update_crc(int crc,
 byte[] buf,
 int offset,
 int len)

crc

private static int crc(byte[] buf,
 int offset,
 int len)

crc

private static int crc(byte[] buf)

outputInt

public void outputInt(int n)
               throws IOException

Throws:

IOException

outputInt

public static void outputInt(int n,
 OutputStream s)
                      throws IOException

Throws:

IOException

writeChunk

public void writeChunk(byte[] chunkType,
 byte[] data)
                throws IOException

Throws:

IOException