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 1997-2017 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.images.SamplingFactory;
import org.jpedal.parser.image.PdfImageTypes;
import org.jpedal.parser.image.data.ImageData;
/**
* @author markee
*/
public class DownSampler {
public static GenericColorSpace downSampleImage(GenericColorSpace decodeColorData,
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)) {
imageData.setImageType(PdfImageTypes.Binary);
//make 1 bit indexed flat
if (index != null) {
index = decodeColorData.convertIndexToRGB(index);
decodeColorData.setIndex(index, index.length / 3);
decodeColorData = OneBitDownSampler.downSampleIndexed(sampling, imageData, index, decodeColorData);
} else if (maskCol != null) {
decodeColorData = OneBitDownSampler.downSampleMask(sampling, imageData, maskCol, decodeColorData);
} else {
decodeColorData = OneBitDownSampler.downSample(sampling, imageData, decodeColorData);
}
} else if (imageData.getDepth() == 8) {
decodeColorData = EightBitDownSampler.downSample(imageData, decodeColorData, sampling);
}
if (SamplingFactory.kernelSharpen && imageData.getImageType().equals(PdfImageTypes.Binary)) {
imageData = KernelUtils.applyKernel(imageData);
}
}
return decodeColorData;
}
}