org.jpedal.parser.image.downsample.DownSampler Maven / Gradle / Ivy
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* DownSampler.java
* ---------------
*/
package org.jpedal.parser.image.downsample;
import org.jpedal.color.ColorSpaces;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.parser.image.data.ImageData;
/**
*
* @author markee
*/
public class DownSampler {
public static GenericColorSpace downSampleImage(GenericColorSpace decodeColorData,
final ImageData imageData, final byte[] maskCol, final int sampling) {
if(sampling>1){ //safety check
imageData.setIsDownsampled(true);
byte[] index=decodeColorData.getIndexedMap();
if(imageData.getDepth()==1 && (decodeColorData.getID()!=ColorSpaces.DeviceRGB || index==null)){
//make 1 bit indexed flat
if(index!=null) {
index = decodeColorData.convertIndexToRGB(index);
decodeColorData.setIndex(index, index.length/3);
}
decodeColorData=OneBitDownSampler.downSample(sampling, imageData, maskCol, index, decodeColorData);
}else if(imageData.getDepth()==8){
decodeColorData=EightBitDownSampler.downSample(imageData, decodeColorData, sampling);
}
}
return decodeColorData;
}
}