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com.keypoint.PngEncoder.html Maven / Gradle / Ivy

  

  
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com.keypoint


Class  PngEncoder
java.lang.Object
  |
  +--com.keypoint.PngEncoder



public class PngEncoder
extends java.lang.Object














Field Summary



protected  int
bytePos



           



protected  int
bytesPerPixel



           



protected  int
compressionLevel



           



protected  java.util.zip.CRC32
crc



           



protected  long
crcValue



           



protected  int
dataPos



           



static boolean
ENCODE_ALPHA



          Constant specifying that alpha channel should be encoded.



protected  boolean
encodeAlpha



           



protected  int
endPos



           



protected  int
filter



           



static int
FILTER_LAST



           



static int
FILTER_NONE



          Constants for filters



static int
FILTER_SUB



           



static int
FILTER_UP



           



protected  int
hdrPos



           



protected  int
height



           



protected  java.awt.Image
image



           



protected  byte[]
leftBytes



           



protected  int
maxPos



           



static boolean
NO_ALPHA



          Constant specifying that alpha channel should not be encoded.



protected  byte[]
pngBytes



           



protected  byte[]
priorRow



           



protected  int
width



           


 






Constructor Summary


PngEncoder()



          Class constructor


PngEncoder(java.awt.Image image)



          Class constructor specifying Image source to encode, with no alpha channel encoding.


PngEncoder(java.awt.Image image,
           boolean encodeAlpha)



          Class constructor specifying Image source to encode, and whether to encode alpha or not


PngEncoder(java.awt.Image image,
           boolean encodeAlpha,
           int which_filter)



          Class constructor specifying Image source to encode, whether to encode alpha or not, and which filter to use


PngEncoder(java.awt.Image image,
           boolean encodeAlpha,
           int which_filter,
           int comp_level)



          Class constructor specifying Image source to encode, whether to encode alpha or not, which filter to use, and compression level.


 






Method Summary



 int
getCompressionLevel()



          Retrieve compression level



 boolean
getEncodeAlpha()



          Retrieve alpha encoding status.



 int
getFilter()



          Retrieve filtering scheme



 byte[]
pngEncode()



          Creates an array of bytes that is the PNG equivalent of the current image.



 byte[]
pngEncode(boolean encodeAlpha)



          Creates an array of bytes that is the PNG equivalent of the current image, specifying whether to encode alpha or not.



protected  byte[]
resizeByteArray(byte[] array,
                int newLength)



          Increase or decrease the length of a byte array.



 void
setCompressionLevel(int level)



          Set the compression level to use



 void
setEncodeAlpha(boolean encodeAlpha)



          Set the alpha encoding on or off.



 void
setFilter(int which_filter)



          Set the filter to use



 void
setImage(java.awt.Image image)



          Set the image to be encoded


 


Methods inherited from class java.lang.Object


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


 








Field Detail




ENCODE_ALPHA
public static final boolean ENCODE_ALPHA

Constant specifying that alpha channel should be encoded.



NO_ALPHA
public static final boolean NO_ALPHA

Constant specifying that alpha channel should not be encoded.



FILTER_NONE
public static final int FILTER_NONE

Constants for filters



FILTER_SUB
public static final int FILTER_SUB





FILTER_UP
public static final int FILTER_UP





FILTER_LAST
public static final int FILTER_LAST





pngBytes
protected byte[] pngBytes





priorRow
protected byte[] priorRow





leftBytes
protected byte[] leftBytes





image
protected java.awt.Image image





width
protected int width





height
protected int height





bytePos
protected int bytePos





maxPos
protected int maxPos





hdrPos
protected int hdrPos





dataPos
protected int dataPos





endPos
protected int endPos





crc
protected java.util.zip.CRC32 crc





crcValue
protected long crcValue





encodeAlpha
protected boolean encodeAlpha





filter
protected int filter





bytesPerPixel
protected int bytesPerPixel





compressionLevel
protected int compressionLevel









Constructor Detail




PngEncoder
public PngEncoder()

Class constructor



PngEncoder
public PngEncoder(java.awt.Image image)

Class constructor specifying Image source to encode, with no alpha channel encoding.

Parameters:
image - A Java Image object which uses the DirectColorModel
See Also: 
Image, 
java.awt.image.DirectColorModel





PngEncoder
public PngEncoder(java.awt.Image image,
                  boolean encodeAlpha)

Class constructor specifying Image source to encode, and whether to encode alpha or not

Parameters:
image - A Java Image object which uses the DirectColorModel
encodeAlpha - Encode the alpha channel? false=no; true=yes
See Also: 
Image, 
java.awt.image.DirectColorModel





PngEncoder
public PngEncoder(java.awt.Image image,
                  boolean encodeAlpha,
                  int which_filter)

Class constructor specifying Image source to encode, whether to encode alpha or not, and which filter to use

Parameters:
image - A Java Image object which uses the DirectColorModel
encodeAlpha - Encode the alpha channel? false=no; true=yes
which_filter - 0=none, 1=sub, 2=up
See Also: 
Image, 
java.awt.image.DirectColorModel





PngEncoder
public PngEncoder(java.awt.Image image,
                  boolean encodeAlpha,
                  int which_filter,
                  int comp_level)

Class constructor specifying Image source to encode, whether to encode alpha or not, which filter to use, and compression level.

Parameters:
image - A Java Image object which uses the DirectColorModel
encodeAlpha - Encode the alpha channel? false=no; true=yes
which_filter - 0=none, 1=sub, 2=up
comp_level - 0..9
See Also: 
Image, 
java.awt.image.DirectColorModel









Method Detail




setImage
public void setImage(java.awt.Image image)

Set the image to be encoded

Parameters:
image - A Java Image object which uses the DirectColorModel
See Also: 
Image, 
java.awt.image.DirectColorModel





pngEncode
public byte[] pngEncode(boolean encodeAlpha)

Creates an array of bytes that is the PNG equivalent of the current image, specifying whether to encode alpha or not.

Parameters:
encodeAlpha - boolean false=no alpha, true=encode alpha
Returns:
an array of bytes, or null if there was a problem





pngEncode
public byte[] pngEncode()

Creates an array of bytes that is the PNG equivalent of the current image.
 Alpha encoding is determined by its setting in the constructor.

Returns:
an array of bytes, or null if there was a problem





setEncodeAlpha
public void setEncodeAlpha(boolean encodeAlpha)

Set the alpha encoding on or off.

Parameters:
encodeAlpha - false=no, true=yes





getEncodeAlpha
public boolean getEncodeAlpha()

Retrieve alpha encoding status.

Returns:
boolean false=no, true=yes





setFilter
public void setFilter(int which_filter)

Set the filter to use

Parameters:
which_filter - from constant list





getFilter
public int getFilter()

Retrieve filtering scheme

Returns:
int (see constant list)





setCompressionLevel
public void setCompressionLevel(int level)

Set the compression level to use

Parameters:
level - 0 through 9





getCompressionLevel
public int getCompressionLevel()

Retrieve compression level

Returns:
int in range 0-9





resizeByteArray
protected byte[] resizeByteArray(byte[] array,
                                 int newLength)

Increase or decrease the length of a byte array.

Parameters:
array - The original array.
newLength - The length you wish the new array to have.
Returns:
Array of newly desired length. If shorter than the
         original, the trailing elements are truncated.












  

  
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