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org.apache.batik.transcoder.image
Class PNGTranscoder

java.lang.Object
  extended by org.apache.batik.transcoder.TranscoderSupport
      extended by org.apache.batik.transcoder.AbstractTranscoder
          extended by org.apache.batik.transcoder.XMLAbstractTranscoder
              extended by org.apache.batik.transcoder.SVGAbstractTranscoder
                  extended by org.apache.batik.transcoder.image.ImageTranscoder
                      extended by org.apache.batik.transcoder.image.PNGTranscoder
All Implemented Interfaces:
Transcoder
public class PNGTranscoder
extends ImageTranscoder

This class is an ImageTranscoder that produces a PNG image.

Nested Class Summary
static interface PNGTranscoder.WriteAdapter
          This interface is used by PNGTranscoder to write PNG images through different codecs.
 
Nested classes/interfaces inherited from class org.apache.batik.transcoder.SVGAbstractTranscoder
SVGAbstractTranscoder.SVGAbstractTranscoderUserAgent
 
Field Summary
static float[] DEFAULT_CHROMA
          The default Primary Chromaticities for sRGB imagery.
static TranscodingHints.Key KEY_GAMMA
          The gamma correction key.
static TranscodingHints.Key KEY_INDEXED
          The color indexed image key to specify number of colors used in palette.
 
Fields inherited from class org.apache.batik.transcoder.image.ImageTranscoder
KEY_BACKGROUND_COLOR, KEY_FORCE_TRANSPARENT_WHITE
 
Fields inherited from class org.apache.batik.transcoder.SVGAbstractTranscoder
builder, ctx, curAOI, curTxf, DEFAULT_ALLOWED_SCRIPT_TYPES, DEFAULT_DEFAULT_FONT_FAMILY, height, KEY_ALLOWED_SCRIPT_TYPES, KEY_ALTERNATE_STYLESHEET, KEY_AOI, KEY_CONSTRAIN_SCRIPT_ORIGIN, KEY_DEFAULT_FONT_FAMILY, KEY_EXECUTE_ONLOAD, KEY_HEIGHT, KEY_LANGUAGE, KEY_MAX_HEIGHT, KEY_MAX_WIDTH, KEY_MEDIA, KEY_PIXEL_TO_MM, KEY_PIXEL_UNIT_TO_MILLIMETER, KEY_SNAPSHOT_TIME, KEY_USER_STYLESHEET_URI, KEY_WIDTH, root, userAgent, width
 
Fields inherited from class org.apache.batik.transcoder.XMLAbstractTranscoder
KEY_DOCUMENT_ELEMENT, KEY_DOCUMENT_ELEMENT_NAMESPACE_URI, KEY_DOM_IMPLEMENTATION, KEY_XML_PARSER_CLASSNAME, KEY_XML_PARSER_VALIDATING
 
Fields inherited from class org.apache.batik.transcoder.TranscoderSupport
handler, hints
 
Constructor Summary
PNGTranscoder()
          Constructs a new transcoder that produces png images.
 
Method Summary
 BufferedImage createImage(int width, int height)
          Creates a new ARGB image with the specified dimension.
 UserAgent getUserAgent()
           
 void writeImage(BufferedImage img, TranscoderOutput output)
          Writes the specified image to the specified output.
 
Methods inherited from class org.apache.batik.transcoder.image.ImageTranscoder
createRenderer, forceTransparentWhite, transcode
 
Methods inherited from class org.apache.batik.transcoder.SVGAbstractTranscoder
createBridgeContext, createBridgeContext, createBridgeContext, createDocumentFactory, createUserAgent, getCanvasGraphicsNode, setImageSize, transcode
 
Methods inherited from class org.apache.batik.transcoder.TranscoderSupport
addTranscodingHint, getErrorHandler, getTranscodingHints, removeTranscodingHint, setErrorHandler, setTranscodingHints, setTranscodingHints
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.apache.batik.transcoder.Transcoder
addTranscodingHint, getErrorHandler, getTranscodingHints, removeTranscodingHint, setErrorHandler, setTranscodingHints, setTranscodingHints
 

Field Detail

KEY_GAMMA

public static final TranscodingHints.Key KEY_GAMMA
The gamma correction key.
Key: KEY_GAMMA
Value: Float
Default: PNGEncodeParam.INTENT_PERCEPTUAL
Required: No
Description: Controls the gamma correction of the PNG image. A value of zero for gamma disables the generation of a gamma chunk. No value causes an sRGB chunk to be generated.

DEFAULT_CHROMA

public static final float[] DEFAULT_CHROMA
The default Primary Chromaticities for sRGB imagery.

KEY_INDEXED

public static final TranscodingHints.Key KEY_INDEXED
The color indexed image key to specify number of colors used in palette.
Key: KEY_INDEXED
Value: Integer
Default: none/true color image
Required: No
Description: Turns on the reduction of the image to index colors by specifying color bit depth, 1, 2, 4 or 8. The resultant PNG will be an indexed PNG with color bit depth specified.

Constructor Detail

PNGTranscoder

public PNGTranscoder()
Constructs a new transcoder that produces png images.

Method Detail

getUserAgent

public UserAgent getUserAgent()
Returns:
the transcoder's user agent

createImage

public BufferedImage createImage(int width,
                                 int height)
Creates a new ARGB image with the specified dimension.

Specified by:
createImage in class ImageTranscoder
Parameters:
width - the image width in pixels
height - the image height in pixels

writeImage

public void writeImage(BufferedImage img,
                       TranscoderOutput output)
                throws TranscoderException
Writes the specified image to the specified output.

Specified by:
writeImage in class ImageTranscoder
Parameters:
img - the image to write
output - the output where to store the image
Throws:
TranscoderException - if an error occured while storing the image
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