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/*
* Invert
*
* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2006 Marco Schmidt.
* All rights reserved.
*/
package net.sourceforge.jiu.color;
import net.sourceforge.jiu.data.PixelImage;
import net.sourceforge.jiu.data.Palette;
import net.sourceforge.jiu.data.Paletted8Image;
import net.sourceforge.jiu.data.IntegerImage;
import net.sourceforge.jiu.ops.ImageToImageOperation;
import net.sourceforge.jiu.ops.MissingParameterException;
import net.sourceforge.jiu.ops.OperationFailedException;
import net.sourceforge.jiu.ops.WrongParameterException;
/**
* Creates an inverted (negated) version of an image.
* This is done by subtracting each sample value of a channel
* from the maximum sample for that channel.
* The maximum sample for a channel is given by
* {@link net.sourceforge.jiu.data.IntegerImage#getMaxSample}.
* For paletted images, just the palette is treated that way.
* Supported image types: {@link net.sourceforge.jiu.data.IntegerImage}.
* Input and output image can be the same object.
* <h3>Usage</h3>
* There are two ways of using this class.
* Either create an Invert object and set all paramters yourself.
* This lets you reuse image objects or add a progress listener.
* <pre>
* Invert invert = new Invert();
* invert.setInputImage(image);
* invert.addProgressListener(listener); // this is optional
* invert.process();
* PixelImage invertedImage = invert.getOutputImage();
* </pre>
* The other method is by sing the static convenience method
* <pre>
* PixelImage invertedImage = Invert.invert(someImage);
* </pre>
* You will have to catch the potential exceptions in both cases.
* @author Marco Schmidt
*/
public class Invert extends ImageToImageOperation
{
/**
* Helper method to return an inverted image from the argument image.
* @param inputImage image to be inverted
* @return new image object with inverted image
* @throws OperationFailedException on operation errors
*/
public static PixelImage invert(PixelImage inputImage) throws OperationFailedException
{
Invert invert = new Invert();
invert.setInputImage(inputImage);
invert.process();
return invert.getOutputImage();
}
private void prepare(PixelImage in) throws
MissingParameterException,
WrongParameterException
{
if (in == null)
{
throw new MissingParameterException("Missing input image.");
}
PixelImage out = getOutputImage();
if (out == null)
{
setOutputImage(in.createCompatibleImage(in.getWidth(), in.getHeight()));
}
else
{
if (in.getClass() != out.getClass())
{
throw new WrongParameterException("Specified output image type must be the same as input image type.");
}
if (in.getWidth() != out.getWidth())
{
throw new WrongParameterException("Specified output image must have same width as input image.");
}
if (in.getHeight() != out.getHeight())
{
throw new WrongParameterException("Specified output image must have same height as input image.");
}
}
}
private void process(Paletted8Image in)
{
// prepare(PixelImage) has made sure that we have a compatible output image
Paletted8Image out = (Paletted8Image)getOutputImage();
// invert palette of output image
Palette pal = out.getPalette();
final int MAX = pal.getMaxValue();
for (int entryIndex = 0; entryIndex < pal.getNumEntries(); entryIndex++)
{
for (int channelIndex = 0; channelIndex < 3; channelIndex++)
{
pal.putSample(channelIndex, entryIndex, MAX - pal.getSample(channelIndex, entryIndex));
}
}
// copy image content
final int WIDTH = in.getWidth();
final int HEIGHT = in.getHeight();
for (int y = 0; y < HEIGHT; y++)
{
for (int x = 0; x < WIDTH; x++)
{
out.putSample(0, x, y, in.getSample(0, x, y));
}
setProgress(y, HEIGHT);
}
}
private void process(IntegerImage in)
{
IntegerImage out = (IntegerImage)getOutputImage();
final int WIDTH = in.getWidth();
final int HEIGHT = in.getHeight();
final int CHANNELS = in.getNumChannels();
final int TOTAL_ITEMS = CHANNELS * HEIGHT;
int processedItems = 0;
for (int channel = 0; channel < CHANNELS; channel++)
{
final int MAX = in.getMaxSample(channel);
for (int y = 0; y < HEIGHT; y++)
{
for (int x = 0; x < WIDTH; x++)
{
out.putSample(channel, x, y, MAX - in.getSample(channel, x, y));
}
setProgress(processedItems++, TOTAL_ITEMS);
}
}
}
/**
* Inverts the input image, reusing an output image if one has been specified.
* For paletted images, inverts the palette.
* For all other types, subtracts each sample of each channel from the maximum
* value of that channel.
* @throws MissingParameterException if the input image is missing
* @throws WrongParameterException if any of the specified image parameters are unsupported or of the wrong width or height
*/
public void process() throws
MissingParameterException,
WrongParameterException
{
PixelImage in = getInputImage();
prepare(in);
if (in instanceof Paletted8Image)
{
process((Paletted8Image)in);
}
else
if (in instanceof IntegerImage)
{
process((IntegerImage)in);
}
else
{
throw new WrongParameterException("Input image type unsupported: " + in.toString());
}
}
}
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