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Java Source Code / Java Documentation » 6.0 JDK Modules » Java Advanced Imaging » javax.media.jai.operator 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javax.media.jai.OperationDescriptorImpl
      javax.media.jai.operator.FormatDescriptor

FormatDescriptor
public class FormatDescriptor extends OperationDescriptorImpl (Code)
An OperationDescriptor describing the "Format" operation.

The "Format" operation performs reformatting on an image. It is capable of casting the pixel values of an image to a given data type, replacing the SampleModel and ColorModel of an image, and restructuring the image's tile grid layout. The pixel values of the destination image are defined by the pseudocode:

dst[x][y][b] = cast(src[x][y][b], dataType)
where "dataType" is one of the constants TYPE_BYTE, TYPE_SHORT, TYPE_USHORT, TYPE_INT, TYPE_FLOAT, or TYPE_DOUBLE from java.awt.image.DataBuffer.

The output SampleModel, ColorModel and tile grid layout are specified by passing an ImageLayout object as a RenderingHint named "ImageLayout". The output image will have a SampleModel compatible with the one specified in the layout hint wherever possible; however, for output data types of float and double a ComponentSampleModel will be used regardless of the value of the hint parameter.

One of the common uses of the format operator is to cast the pixel values of an image to a given data type. In such a case, if the source image provided has an IndexColorModel, a RenderingHints object for JAI.KEY_REPLACE_INDEX_COLOR_MODEL with the value of Boolean.TRUE will automatically be added to the configuration Map for the operation. This addition will only take place if a value for the JAI.KEY_REPLACE_INDEX_COLOR_MODEL has not already been provided by the user. Note that the configuration Map is cloned before the new hint is added to it. Due to the addition of this new RenderingHint, using the "format" operation with source(s) that have an IndexColorModel will cause the destination to have an expanded non-IndexColorModel ColorModel. This expansion ensures that the conversion to a different data type, ColorModel or SampleModel happens correctly such that the indices into the color map (for IndexColorModel images) are not treated as pixel data. If the format operator is not being used to cast the pixel values of an image to a given data type, the expansion will not take place, the resultant image will still have an IndexColorModel.

The ImageLayout may also specify a tile grid origin and size which will be respected.

The typecasting performed by the Format function is defined by the following set of expressions, dependent on the data types of the source and destination. Casting an image to its current data type is a no-op. See The Java Language Specification for the definition of type conversions between primitive types.

In most cases, it is not necessary to explictly perform widening typecasts since they will be performed automatically by image operators when handed source images having different datatypes.

Source Type Destination Type Action
BYTE SHORT (short)(x & 0xff)
BYTE USHORT (short)(x & 0xff)
BYTE INT (int)(x & 0xff)
BYTE FLOAT (float)(x & 0xff)
BYTE DOUBLE (double)(x & 0xff)
SHORT BYTE (byte)clamp((int)x, 0, 255)
SHORT USHORT (short)clamp((int)x, 0, 32767)
SHORT INT (int)x
SHORT FLOAT (float)x
SHORT DOUBLE (double)x
USHORT BYTE (byte)clamp((int)x & 0xffff, 0, 255)
USHORT SHORT (short)clamp((int)x & 0xffff, 0, 32767)
USHORT INT (int)(x & 0xffff)
USHORT FLOAT (float)(x & 0xffff)
USHORT DOUBLE (double)(x & 0xffff)
INT BYTE (byte)clamp(x, 0, 255)
INT SHORT (short)clamp(x, -32768, 32767)
INT USHORT (short)clamp(x, 0, 65535)
INT FLOAT (float)x
INT DOUBLE (double)x
FLOAT BYTE (byte)clamp((int)x, 0, 255)
FLOAT SHORT (short)clamp((int)x, -32768, 32767)
FLOAT USHORT (short)clamp((int)x, 0, 65535)
FLOAT INT (int)x
FLOAT DOUBLE (double)x
DOUBLE BYTE (byte)clamp((int)x, 0, 255)
DOUBLE SHORT (short)clamp((int)x, -32768, 32767)
DOUBLE USHORT (short)clamp((int)x, 0, 65535)
DOUBLE INT (int)x
DOUBLE FLOAT (float)x

The clamp function may be defined as:
 int clamp(int x, int low, int high) {
 return (x < low) ? low : ((x > high) ? high : x);
 }
 

Resource List
Name Value
GlobalName Format
LocalName Format
Vendor com.sun.media.jai
Description Reformats an image.
DocURL http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/FormatDescriptor.html
Version 1.0
arg0Desc The output data type (from java.awt.image.DataBuffer).

Parameter List
Name Class Type Default Value
dataType java.lang.Integer DataBuffer.TYPE_BYTE


See Also:   java.awt.image.DataBuffer
See Also:   javax.media.jai.ImageLayout
See Also:   javax.media.jai.OperationDescriptor



Constructor Summary
public  FormatDescriptor()
     Constructor.

Method Summary
public static  RenderedOpcreate(RenderedImage source0, Integer dataType, RenderingHints hints)
     Reformats an image.

Creates a ParameterBlockJAI from all supplied arguments except hints and invokes JAI.create(StringParameterBlockRenderingHints) .
See Also:   JAI
See Also:   ParameterBlockJAI
See Also:   RenderedOp
Parameters:
  source0 - RenderedImage source 0.
Parameters:
  dataType - The output data type (from java.awt.image.DataBuffer).May be null.
Parameters:
  hints - The RenderingHints to use.May be null.

public static  RenderableOpcreateRenderable(RenderableImage source0, Integer dataType, RenderingHints hints)
     Reformats an image.

Creates a ParameterBlockJAI from all supplied arguments except hints and invokes JAI.createRenderable(StringParameterBlockRenderingHints) .
See Also:   JAI
See Also:   ParameterBlockJAI
See Also:   RenderableOp
Parameters:
  source0 - RenderableImage source 0.
Parameters:
  dataType - The output data type (from java.awt.image.DataBuffer).May be null.
Parameters:
  hints - The RenderingHints to use.May be null.

public  NumbergetParamMaxValue(int index)
     Returns the maximum legal value of a specified numeric parameter for this operation.
public  NumbergetParamMinValue(int index)
     Returns the minimum legal value of a specified numeric parameter for this operation.
public  booleanisRenderableSupported()
     Returns true since renderable operation is supported.


Constructor Detail
FormatDescriptor
public FormatDescriptor()(Code)
Constructor.




Method Detail
create
public static RenderedOp create(RenderedImage source0, Integer dataType, RenderingHints hints)(Code)
Reformats an image.

Creates a ParameterBlockJAI from all supplied arguments except hints and invokes JAI.create(StringParameterBlockRenderingHints) .
See Also:   JAI
See Also:   ParameterBlockJAI
See Also:   RenderedOp
Parameters:
  source0 - RenderedImage source 0.
Parameters:
  dataType - The output data type (from java.awt.image.DataBuffer).May be null.
Parameters:
  hints - The RenderingHints to use.May be null. The RenderedOp destination.
throws:
  IllegalArgumentException - if source0 is null.




createRenderable
public static RenderableOp createRenderable(RenderableImage source0, Integer dataType, RenderingHints hints)(Code)
Reformats an image.

Creates a ParameterBlockJAI from all supplied arguments except hints and invokes JAI.createRenderable(StringParameterBlockRenderingHints) .
See Also:   JAI
See Also:   ParameterBlockJAI
See Also:   RenderableOp
Parameters:
  source0 - RenderableImage source 0.
Parameters:
  dataType - The output data type (from java.awt.image.DataBuffer).May be null.
Parameters:
  hints - The RenderingHints to use.May be null. The RenderableOp destination.
throws:
  IllegalArgumentException - if source0 is null.




getParamMaxValue
public Number getParamMaxValue(int index)(Code)
Returns the maximum legal value of a specified numeric parameter for this operation.



getParamMinValue
public Number getParamMinValue(int index)(Code)
Returns the minimum legal value of a specified numeric parameter for this operation.



isRenderableSupported
public boolean isRenderableSupported()(Code)
Returns true since renderable operation is supported.



Fields inherited from javax.media.jai.OperationDescriptorImpl
final protected String[][] resources(Code)(Java Doc)
final protected String[] sourceNames(Code)(Java Doc)
final protected String[] supportedModes(Code)(Java Doc)

Methods inherited from javax.media.jai.OperationDescriptorImpl
public boolean arePropertiesSupported()(Code)(Java Doc)
protected static Class getDefaultSourceClass(String modeName)(Code)(Java Doc)
public Class getDestClass(String modeName)(Code)(Java Doc)
public Class getDestClass()(Code)(Java Doc)
public Object getInvalidRegion(String modeName, ParameterBlock oldParamBlock, RenderingHints oldHints, ParameterBlock newParamBlock, RenderingHints newHints, OperationNode node)(Code)(Java Doc)
public String getName()(Code)(Java Doc)
public int getNumParameters()(Code)(Java Doc)
public int getNumSources()(Code)(Java Doc)
public Class[] getParamClasses()(Code)(Java Doc)
public Object getParamDefaultValue(int index)(Code)(Java Doc)
public Object[] getParamDefaults()(Code)(Java Doc)
public Number getParamMaxValue(int index)(Code)(Java Doc)
public Number getParamMinValue(int index)(Code)(Java Doc)
public String[] getParamNames()(Code)(Java Doc)
public ParameterListDescriptor getParameterListDescriptor(String modeName)(Code)(Java Doc)
public PropertyGenerator[] getPropertyGenerators(String modeName)(Code)(Java Doc)
public PropertyGenerator[] getPropertyGenerators()(Code)(Java Doc)
public Class getRenderableDestClass()(Code)(Java Doc)
public Class[] getRenderableSourceClasses()(Code)(Java Doc)
public ResourceBundle getResourceBundle(Locale locale)(Code)(Java Doc)
public String[][] getResources(Locale locale)(Code)(Java Doc)
public Class[] getSourceClasses(String modeName)(Code)(Java Doc)
public Class[] getSourceClasses()(Code)(Java Doc)
public String[] getSourceNames()(Code)(Java Doc)
public String[] getSupportedModes()(Code)(Java Doc)
public boolean isImmediate()(Code)(Java Doc)
public boolean isModeSupported(String modeName)(Code)(Java Doc)
public boolean isRenderableSupported()(Code)(Java Doc)
public boolean isRenderedSupported()(Code)(Java Doc)
protected static Class[][] makeDefaultSourceClassList(String[] supportedModes, int numSources)(Code)(Java Doc)
public boolean validateArguments(String modeName, ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
public boolean validateArguments(ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
protected boolean validateParameters(String modeName, ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
protected boolean validateParameters(ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
public boolean validateRenderableArguments(ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
protected boolean validateRenderableSources(ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
protected boolean validateSources(String modeName, ParameterBlock args, StringBuffer msg)(Code)(Java Doc)
protected boolean validateSources(ParameterBlock args, StringBuffer msg)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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