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/*
* Flip
*
* Copyright (c) 2001, 2002, 2003 Marco Schmidt.
* All rights reserved.
*/
package net.sourceforge.jiu.geometry;
import net.sourceforge.jiu.data.PixelImage;
import net.sourceforge.jiu.data.IntegerImage;
import net.sourceforge.jiu.ops.ImageToImageOperation;
import net.sourceforge.jiu.ops.MissingParameterException;
import net.sourceforge.jiu.ops.WrongParameterException;
/**
* Flips images (top row becomes bottom row and vice versa, and so on).
* <p>
* Supported image types: {@link IntegerImage}.
* <p>
* Usage example:
* <pre>
* Flip flip = new Flip();
* flip.setInputImage(image); // image is some IntegerImage object
* flip.process();
* PixelImage flippedImage = flip.getOutputImage();
* </pre>
* @author Marco Schmidt
*/
public class Flip extends ImageToImageOperation
{
private void process(IntegerImage in, IntegerImage out)
{
final int WIDTH = in.getWidth();
final int HEIGHT = in.getHeight();
final int TOTAL_ITEMS = in.getNumChannels() * HEIGHT;
if (out == null)
{
out = (IntegerImage)in.createCompatibleImage(WIDTH, HEIGHT);
setOutputImage(out);
}
int processedItems = 0;
for (int c = 0; c < in.getNumChannels(); c++)
{
for (int y1 = 0, y2 = HEIGHT - 1; y1 < HEIGHT; y1++, y2--)
{
for (int x = 0; x < WIDTH; x++)
{
out.putSample(c, x, y2, in.getSample(c, x, y1));
}
setProgress(processedItems++, TOTAL_ITEMS);
}
}
}
public void process() throws
MissingParameterException,
WrongParameterException
{
ensureInputImageIsAvailable();
ensureImagesHaveSameResolution();
PixelImage in = getInputImage();
if (in instanceof IntegerImage)
{
process((IntegerImage)in, (IntegerImage)getOutputImage());
}
else
{
throw new WrongParameterException("Input image must be of type IntegerImage.");
}
}
}
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