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java.lang.Object | +--javax.media.jai.OperationDescriptorImpl | +--javax.media.jai.operator.PNGDescriptor
An OperationDescriptor
describing the "PNG" operation.
The "PNG" operation reads a standard PNG version 1.1 input stream.
The PNG (Portable Network Graphics) specification may be
found at
http://www.cdrom.com/pub/png/spec
.
The "PNG" operation implements the entire PNG specification, but provides access only to the final, high-resolution version of interlaced images.
The second parameter contains an instance of
PNGDecodeParam
to be used during the decoding.
It may be set to null
in order to perform default
decoding, or equivalently may be omitted.
The documentation for PNGDecodeParam
describes the
possible output formats of PNG images after decoding.
The classes in the com.sun.media.jai.codec
package are not a committed part of the JAI API. Future releases
of JAI will make use of new classes in their place. This
class will change accordingly.
Name | Value |
---|---|
GlobalName | PNG |
LocalName | PNG |
Vendor | com.sun.media.jai |
Description | Reads an image from a PNG stream. |
DocURL | http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/PNGDescriptor.html |
Version | 1.0 |
arg0Desc | The SeekableStream to read from. |
arg1Desc | The PNGDecodeParam to use. |
Name | Class Type | Default Value |
---|---|---|
stream | com.sun.media.jai.codec.SeekableStream | NO_PARAMETER_DEFAULT |
param | com.sun.media.jai.codec.PNGDecodeParam | null |
Property Name | Class | Comment |
---|---|---|
file_type | String | "PNG v. 1.0" |
background_color | java.awt.Color | The suggested background color. |
significant_bits | int[] | The number of significant bits stored in the file. |
bit_depth | Integer | The bit depth of the file |
color_type | String | One of "Grayscale", "Truecolor", "Index", "Grayscale with alpha" or "Truecolor with alpha" |
interlace_method | String | "None" or "Adam7" |
white_point_x | Float | The CIE X coordinate of the white point, if known. |
white_point_y | Float | The CIE Y coordinate of the white point, if known. |
red_x | Float | The CIE X coordinate of the red primary, if known. |
red_y | Float | The CIE Y coordinate of the red primary, if known. |
green_x | Float | The CIE X coordinate of the green primary, if known. |
green_y | Float | The CIE Y coordinate of the green primary, if known. |
blue_x | Float | The CIE X coordinate of the blue primary, if known. |
blue_y | Float | The CIE Y coordinate of the blue primary, if known. |
gamma | Float | The image gamma, if known. |
x_pixels_per_unit | Integer | The number of horizontal pixels per unit. |
y_pixels_per_unit | Integer | The number of vertical pixels per unit. |
pixel_aspect_ratio | Float | The width of a pixel divided by its height. |
pixel_units | String | "Meters" or null |
timestamp | java.util.Date | The creation or modification time of the image. |
text:* | String | The value of a tEXt chunk. |
ztext:* | String | The value of a zTXt chunk (not yet implemented). |
chunk:* | byte[] | The contents of any non-standard chunks. |
PNGDecodeParam
,
SeekableStream
,
OperationDescriptor
, Serialized FormFields inherited from class javax.media.jai.OperationDescriptorImpl |
resources, sourceNames, supportedModes |
Fields inherited from interface javax.media.jai.OperationDescriptor |
NO_PARAMETER_DEFAULT |
Constructor Summary | |
PNGDescriptor()
Constructor. |
Method Summary | |
static RenderedOp |
create(SeekableStream stream,
PNGDecodeParam param,
RenderingHints hints)
Reads a standard JFIF (PNG) file. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public PNGDescriptor()
Method Detail |
public static RenderedOp create(SeekableStream stream, PNGDecodeParam param, RenderingHints hints)
Creates a ParameterBlockJAI
from all
supplied arguments except hints
and invokes
JAI.create(String,ParameterBlock,RenderingHints)
.
stream
- The SeekableStream to read from.param
- The PNGDecodeParam to use.
May be null
.hints
- The RenderingHints
to use.
May be null
.RenderedOp
destination.IllegalArgumentException
- if stream
is null
.JAI
,
ParameterBlockJAI
,
RenderedOp
|
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