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NextApp Echo3 v3.0.b4 |
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java.lang.Object nextapp.echo.webcontainer.util.PngEncoder
public class PngEncoder
Encodes a java.awt.Image into PNG format. For more information on the PNG specification, see the W3C PNG page at http://www.w3.org/TR/REC-png.html.
Nested Class Summary | |
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static interface |
PngEncoder.Filter
An interface for PNG filters. |
Field Summary | |
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static PngEncoder.Filter |
AVERAGE_FILTER
AverageFilter singleton. |
static PngEncoder.Filter |
PAETH_FILTER
PaethFilter singleton. |
static PngEncoder.Filter |
SUB_FILTER
SubFilter singleton. |
static PngEncoder.Filter |
UP_FILTER
UpFilter singleton. |
Constructor Summary | |
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PngEncoder(java.awt.Image image,
boolean encodeAlpha,
PngEncoder.Filter filter,
int compressionLevel)
Creates a PNG encoder for an image. |
Method Summary | |
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void |
encode(java.io.OutputStream out)
Encodes the image. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final PngEncoder.Filter SUB_FILTER
SubFilter
singleton.
public static final PngEncoder.Filter UP_FILTER
UpFilter
singleton.
public static final PngEncoder.Filter AVERAGE_FILTER
AverageFilter
singleton.
public static final PngEncoder.Filter PAETH_FILTER
PaethFilter
singleton.
Constructor Detail |
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public PngEncoder(java.awt.Image image, boolean encodeAlpha, PngEncoder.Filter filter, int compressionLevel)
image
- the image to be encodedencodeAlpha
- true if the image's alpha channel should be encodedfilter
- The filter to be applied to the image data, one of the
following values:
compressionLevel
- the deflater compression level that will be used
for compressing the image data: Valid values range from 0 to 9.
Higher values result in smaller files and therefore decrease
network traffic, but require more CPU time to encode. The normal
compromise value is 3.Method Detail |
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public void encode(java.io.OutputStream out) throws java.io.IOException
out
- an OutputStream to which the encoded image will be
written
java.io.IOException
- if a problem is encountered writing the output
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