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/*
* ImagesToImageOperation
*
* Copyright (c) 2003 Marco Schmidt.
* All rights reserved.
*/
package net.sourceforge.jiu.ops;
import java.util.Vector;
import net.sourceforge.jiu.data.PixelImage;
import net.sourceforge.jiu.ops.Operation;
import net.sourceforge.jiu.ops.WrongParameterException;
/**
* An operation that takes several input images and produces one output image.
*
* @author Marco Schmidt
* @since 0.11.0
*/
public abstract class ImagesToImageOperation extends Operation
{
private Vector inputImages = new Vector();
private PixelImage outputImage;
/**
* Constructs a new ImagesToImageOperation and initializes
* input images and output image to null.
*/
public ImagesToImageOperation()
{
this(null, null);
}
/**
* Constructs a new ImagesToImageOperation and initializes
* input images and output image to the arguments.
*/
public ImagesToImageOperation(Vector in, PixelImage out)
{
if (in != null)
{
for (int i = 0; i < in.size(); i++)
{
addInputImage((PixelImage)in.elementAt(i));
}
}
setOutputImage(out);
}
/**
* Adds an image to the end of the internal list of
* input images.
*/
public void addInputImage(PixelImage in)
{
inputImages.addElement(in);
}
/**
* Checks if all images have the same resolution as given by their
* getWidth and getHeight methods.
* This method will not complain if input and / or output images are not
* available.
* @throws WrongParameterException if input and output images exist and their
* resolutions differ
*/
public void ensureImagesHaveSameResolution() throws WrongParameterException
{
if (inputImages == null || inputImages.size() < 1)
{
return;
}
PixelImage in = getInputImage(0);
int width = in.getWidth();
int height = in.getHeight();
int index = 1;
while (index < inputImages.size())
{
in = getInputImage(index);
if (in.getWidth() != width)
{
throw new WrongParameterException("Width of images #0 and #" + index + " are not equal.");
}
if (in.getHeight() != height)
{
throw new WrongParameterException("Height of images #0 and #" + index + " are not equal.");
}
index++;
}
PixelImage out = getOutputImage();
if (out != null)
{
if (out.getWidth() != width)
{
throw new WrongParameterException("Width of input images #0 and output image are not equal.");
}
if (out.getHeight() != height)
{
throw new WrongParameterException("Height of input images #0 and output image are not equal.");
}
}
}
/**
* If an output image has been specified this method will compare
* its resolution with the argument resolution and throw an exception if the
* resolutions differ.
* If no output image has been specified nothing happens.
* @param width the horizontal pixel resolution that the output image must have
* @param height the vertical pixel resolution that the output image must have
* @throws WrongParameterException if the resolutions differ
*/
public void ensureOutputImageResolution(int width, int height) throws WrongParameterException
{
PixelImage out = getOutputImage();
if (out != null)
{
if (out.getWidth() != width)
{
throw new WrongParameterException("Output image must have width " + width + " (got: " + out.getWidth() + ").");
}
if (out.getHeight() != height)
{
throw new WrongParameterException("Output image must have height " + height + " (got: " + out.getHeight() + ").");
}
}
}
/**
* Returns the input image stored in this object.
* @return input image, possibly <code>null</code>
*/
public PixelImage getInputImage(int index)
{
return (PixelImage)inputImages.elementAt(index);
}
/**
* Return the number of input images currently stored in this operation.
* @return number of images
*/
public int getNumInputImages()
{
return inputImages.size();
}
/**
* Returns the output image stored in this object.
* @return output image, possibly <code>null</code>
*/
public PixelImage getOutputImage()
{
return outputImage;
}
/**
* Sets the output image stored in this object to the argument.
* Argument can be <code>null</code>.
* @param out the new output image of this object
*/
public void setOutputImage(PixelImage out)
{
outputImage = out;
}
}
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