com.twelvemonkeys.image.SubsamplingFilter Maven / Gradle / Ivy
/*
* Copyright (c) 2008, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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 HOLDER 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.
*/
package com.twelvemonkeys.image;
import java.awt.image.ReplicateScaleFilter;
/**
* An {@code ImageFilter} class for subsampling images.
*
* It is meant to be used in conjunction with a {@code FilteredImageSource}
* object to produce subsampled versions of existing images.
*
*
* @see java.awt.image.FilteredImageSource
*
* @author Harald Kuhr
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/image/SubsamplingFilter.java#1 $
*/
public class SubsamplingFilter extends ReplicateScaleFilter {
private int xSub;
private int ySub;
/**
* Creates a {@code SubsamplingFilter}.
*
* @param pXSub
* @param pYSub
*
* @throws IllegalArgumentException if {@code pXSub} or {@code pYSub} is
* less than 1.
*/
public SubsamplingFilter(int pXSub, int pYSub) {
super(1, 1); // These are NOT REAL values, but we have to defer setting
// until w/h is available, in setDimensions below
if (pXSub < 1 || pYSub < 1) {
throw new IllegalArgumentException("Subsampling factors must be positive.");
}
xSub = pXSub;
ySub = pYSub;
}
/** {@code ImageFilter} implementation, do not invoke. */
public void setDimensions(int pWidth, int pHeight) {
destWidth = (pWidth + xSub - 1) / xSub;
destHeight = (pHeight + ySub - 1) / ySub;
//System.out.println("Subsampling: " + xSub + "," + ySub + "-> " + destWidth + ", " + destHeight);
super.setDimensions(pWidth, pHeight);
}
}