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Image processing operations for SciJava Ops.
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/*
 * #%L
 * Image processing operations for SciJava Ops.
 * %%
 * Copyright (C) 2014 - 2024 SciJava developers.
 * %%
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * #L%
 */

package org.scijava.ops.image.stats;

import java.util.function.BiFunction;

import net.imglib2.Dimensions;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.loops.LoopBuilder;
import net.imglib2.type.numeric.RealType;

import org.scijava.function.Computers;
import org.scijava.ops.spi.Op;
import org.scijava.ops.spi.OpDependency;

/**
 * Op to calculate the {@code stats.sumOfInverses}.
 *
 * @author Gabriel Selzer
 * @param  input type
 * @param  output type
 * @implNote op names='stats.sumOfInverses', priority='100.'
 */
public class DefaultSumOfInverses, O extends RealType>
	implements Computers.Arity2, O, O>
{

	@OpDependency(name = "create.img")
	private BiFunction> imgCreator;

	// TODO: Can we lift this? Would require making a RAI of Doubles.
	@OpDependency(name = "math.reciprocal")
	private Computers.Arity2 reciprocalOp;

	@OpDependency(name = "stats.sum")
	private Computers.Arity1, O> sumOp;

	/**
	 * TODO
	 *
	 * @param input the input data to iterate over
	 * @param dbzValue the value to use for the inverse when the input data is
	 *          zero
	 * @param output the output buffer
	 */
	@Override
	public void compute(final RandomAccessibleInterval input, final O dbzValue,
		final O output)
	{
		RandomAccessibleInterval tmpImg = imgCreator.apply(input, output);
		// TODO: Can we lift this? Would require making a RAI of Doubles.
		LoopBuilder.setImages(input, tmpImg).multiThreaded().forEachPixel((inPixel,
			outPixel) -> {
			reciprocalOp.compute(inPixel, dbzValue.getRealDouble(), outPixel);
		});
		sumOp.compute(tmpImg, output);
	}
}