Class PNGEncoder

java.lang.Object

is.galia.codec.AbstractImageIOEncoder

is.galia.codec.png.PNGEncoder

All Implemented Interfaces:

Encoder, AutoCloseable

public final class PNGEncoder
extends AbstractImageIOEncoder
implements Encoder

Implementation wrapping the default JDK Image I/O PNG ImageWriter.

See Also:

• PNG Specification, Version 1.2

Field Summary

Fields inherited from class is.galia.codec.AbstractImageIOEncoder

arena, encode, iioWriter

Constructor Summary

Constructors

Constructor	Description
PNGEncoder()

Method Summary

Modifier and Type	Method	Description
protected void	addMetadata(IIOMetadataNode baseTree)	Embeds metadata from AbstractImageIOEncoder.encode into the given tree.
void	encode(RenderedImage image, OutputStream outputStream)	Writes the given image to the given output stream.
protected org.slf4j.Logger	getLogger()
protected String[]	getPreferredIIOImplementations()	N.B.: This method returns a list of strings rather than classes because some readers reside under the com.sun package, which is encapsulated in Java 9.
Set<Format>	getSupportedFormats()

Methods inherited from class is.galia.codec.AbstractImageIOEncoder

close, getMetadata, setArena, setEncode

Methods inherited from class java.lang.Object

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

Methods inherited from interface is.galia.codec.Encoder

close, encode, setArena, setEncode

Constructor Details

PNGEncoder

public PNGEncoder()

Method Details

addMetadata

protected void addMetadata(IIOMetadataNode baseTree)

Description copied from class: AbstractImageIOEncoder

Embeds metadata from AbstractImageIOEncoder.encode into the given tree.

Writers for formats that don't support metadata may simply do nothing.

Specified by:

addMetadata in class AbstractImageIOEncoder

Parameters:

baseTree - Tree to embed the metadata into.

getLogger

protected org.slf4j.Logger getLogger()

Specified by:

getLogger in class AbstractImageIOEncoder

getPreferredIIOImplementations

protected String[] getPreferredIIOImplementations()

Description copied from class: AbstractImageIOEncoder

N.B.: This method returns a list of strings rather than classes because some readers reside under the com.sun package, which is encapsulated in Java 9.

Specified by:

getPreferredIIOImplementations in class AbstractImageIOEncoder

Returns:

Plugins preferred by the application, in order of most to least preferred, or an empty array if there is no preference.

getSupportedFormats

public Set<Format> getSupportedFormats()

Specified by:

getSupportedFormats in interface Encoder

Returns:

All formats supported by the instance. Note that the implementation must create the instances from scratch and not obtain them from the format registry, which may be empty at the time this method is invoked.

encode

public void encode(RenderedImage image,
 OutputStream outputStream)
            throws IOException

Writes the given image to the given output stream.

Specified by:

encode in interface Encoder

Parameters:

image - Image to write.

outputStream - Stream to write the image to.

Throws:

IOException