javax.media.jai.operator
Class AddCollectionDescriptor

java.lang.Object
  |
  +--javax.media.jai.OperationDescriptorImpl
        |
        +--javax.media.jai.operator.AddCollectionDescriptor

All Implemented Interfaces:

OperationDescriptor, RegistryElementDescriptor, Serializable

public class AddCollectionDescriptor

extends OperationDescriptorImpl

An OperationDescriptor describing the "AddCollection" operation.

The AddCollection operation takes a collection of rendered source images, and adds every set of pixels, one from each source image of the corresponding position and band. No additional parameters are required.

There is no restriction on the actual class type used to represent the source collection, but each element of the collection must be an instance of RenderedImage. The number of images in the collection may vary from 2 to n. The source images may have different numbers of bands and data types.

By default, the destination image bounds are the intersection of all of the source image bounds. If any of the two sources are completely disjoint, the destination will have a width and a height of 0. The number of bands of the destination image is equal to the minimum number of bands of all the sources, and the data type is the biggest data type of all the sources. If the result of the operation underflows/overflows the minimum/maximum value supported by the destination data type, then it will be clamped to the minimum/maximum value respectively.

The destination pixel values are defined by the pseudocode:

 dst[x][y][b] = 0;
 for (int i = 0; i < numSources; i++) {
     dst[x][y][b] += srcs[i][x][y][b];
 }
 

Resource List

Name	Value
GlobalName	AddCollection
LocalName	AddCollection
Vendor	com.sun.media.jai
Description	Adds a collection of rendered images.
DocURL	http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/AddCollectionDescriptor.html
Version	1.0

No parameters are needed for this operation.

See Also:

RenderedImage, Collection, OperationDescriptor, Serialized Form

Fields inherited from class javax.media.jai.OperationDescriptorImpl

resources, sourceNames, supportedModes

Constructor Summary

AddCollectionDescriptor()
Constructor.

Method Summary

protected boolean

validateSources(String modeName, ParameterBlock args, StringBuffer msg) Validates input source collection.

Methods inherited from class javax.media.jai.OperationDescriptorImpl

arePropertiesSupported, getDefaultSourceClass, getDestClass, getDestClass, getInvalidRegion, getName, getNumParameters, getNumSources, getParamClasses, getParamDefaults, getParamDefaultValue, getParameterListDescriptor, getParamMaxValue, getParamMinValue, getParamNames, getPropertyGenerators, getPropertyGenerators, getRenderableDestClass, getRenderableSourceClasses, getResourceBundle, getResources, getSourceClasses, getSourceClasses, getSourceNames, getSupportedModes, isImmediate, isModeSupported, isRenderableSupported, isRenderedSupported, makeDefaultSourceClassList, validateArguments, validateArguments, validateParameters, validateParameters, validateRenderableArguments, validateRenderableSources, validateSources

Methods inherited from class java.lang.Object

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

Constructor Detail

AddCollectionDescriptor

public AddCollectionDescriptor()

Constructor.

Method Detail

validateSources

protected boolean validateSources(String modeName,
                                  ParameterBlock args,
                                  StringBuffer msg)

Validates input source collection.

Overrides:

validateSources in class OperationDescriptorImpl

Tags copied from class: OperationDescriptorImpl

Parameters:

modeName - the operation mode name

args - a ParameterBlock that has the sources

msg - A string that may contain error messages.

Throws:

IllegalArgumentException - if any of the input parameters are null.

See Also:

OperationDescriptorImpl.validateArguments(java.lang.String, java.awt.image.renderable.ParameterBlock, java.lang.StringBuffer)