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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* 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
*
* ---------------
* OneBitDownSampler.java
* ---------------
*/
package org.jpedal.parser.image.downsample;
import org.jpedal.color.ColorSpaces;
import org.jpedal.color.DeviceRGBColorSpace;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.parser.image.data.ImageData;
/**
*
* @author markee
*/
class OneBitDownSampler {
static GenericColorSpace resetSeparationColorSpace(final byte[] index,final ImageData imageData,final byte[] data) {
//needs to have these settings if 1 bit not indexed
if(index==null && imageData.getDepth()==1){
imageData.setCompCount(1);
invertBytes(data);
}
return new DeviceRGBColorSpace();
}
public static GenericColorSpace downSample(int sampling, final ImageData imageData, GenericColorSpace decodeColorData) {
final byte[] data=imageData.getObjectData();
int newW=imageData.getWidth()/sampling;
int newH=imageData.getHeight()/sampling;
int size=newW*newH;
final byte[] newData=new byte[size];
final int[] flag={1,2,4,8,16,32,64,128};
final int origLineLength= (imageData.getWidth()+7)>>3;
//scan all pixels and down-sample
for(int y=0;ywGapLeft) {
wCount = wGapLeft;
}
if(hCount>hGapLeft) {
hCount = hGapLeft;
}
//count pixels in sample we will make into a pixel (ie 2x2 is 4 pixels , 4x4 is 16 pixels)
final int bytes = getPixelSetCount(sampling, false, data, flag, origLineLength, y, x, wCount, hCount);
final int count=(wCount*hCount);
//set value as white or average of pixels
final int offset=x+(newW*y);
if(count>0){
newData[offset] = (byte) ((255 * bytes) / count);
}else{
newData[offset] = (byte) 255;
}
}
}
imageData.setWidth(newW);
imageData.setHeight(newH);
decodeColorData.setIndex(null, 0);
//remap Separation as already converted here
if(decodeColorData.getID()==ColorSpaces.Separation || decodeColorData.getID()==ColorSpaces.DeviceN){
decodeColorData=new DeviceRGBColorSpace();
imageData.setCompCount(1);
invertBytes(newData);
}
imageData.setObjectData(newData);
imageData.setDepth(8);
return decodeColorData;
}
private static void invertBytes(final byte[] newData) {
final int count=newData.length;
for(int aa=0;aa>3;
//scan all pixels and down-sample
for(int y=0;ywGapLeft) {
wCount = wGapLeft;
}
if(hCount>hGapLeft) {
hCount = hGapLeft;
}
//count pixels in sample we will make into a pixel (ie 2x2 is 4 pixels , 4x4 is 16 pixels)
final int bytes = getPixelSetCount(sampling, true, data, flag, origLineLength, y, x, wCount, hCount);
final int count=(wCount*hCount);
//set value as white or average of pixels
final int offset=x+(newW*y);
if(count>0){
for(int ii=0;ii<4;ii++){
newData[(offset * 4) + ii] = (byte) ((((maskCol[ii] & 255) * bytes) / count));
}
}else{
for(int ii=0;ii<3;ii++) {
newData[(offset * 4) + ii] = (byte) 0;
}
}
}
}
imageData.setWidth(newW);
imageData.setHeight(newH);
//remap Separation as already converted here
if(decodeColorData.getID()==ColorSpaces.Separation || decodeColorData.getID()==ColorSpaces.DeviceN){
decodeColorData=new DeviceRGBColorSpace();
imageData.setCompCount(1);
invertBytes(newData);
}
imageData.setObjectData(newData);
imageData.setDepth(8);
return decodeColorData;
}
public static GenericColorSpace downSampleIndexed(int sampling, final ImageData imageData,
final byte[] index, GenericColorSpace decodeColorData) {
byte[] data=imageData.getObjectData();
int newW=imageData.getWidth()/sampling;
int newH=imageData.getHeight()/sampling;
int size=newW*newH*3;
final byte[] newData=new byte[size];
final int[] flag={1,2,4,8,16,32,64,128};
final int origLineLength= (imageData.getWidth()+7)>>3;
//scan all pixels and down-sample
for(int y=0;ywGapLeft) {
wCount = wGapLeft;
}
if(hCount>hGapLeft) {
hCount = hGapLeft;
}
//count pixels in sample we will make into a pixel (ie 2x2 is 4 pixels , 4x4 is 16 pixels)
final int bytes = getPixelSetCount(sampling, false, data, flag, origLineLength, y, x, wCount, hCount);
final int count=(wCount*hCount);
//set value as white or average of pixels
final int offset=x+(newW*y);
if(count>0){
int av;
for(int ii=0;ii<3;ii++){
//can be in either order so look at index
if(index[0]==-1 && index[1]==-1 && index[2]==-1){
av=(index[ii] & 255) +(index[ii+3] & 255);
newData[(offset*3)+ii]=(byte)(255-((av *bytes)/count));
}else{// if(decodeColorData.getID()==ColorSpaces.DeviceCMYK){ //avoid color 'smoothing' - see CustomersJune2011/lead base paint.pdf
final float ratio=bytes/count;
if(ratio>0.5) {
newData[(offset * 3) + ii] = index[ii + 3];
} else {
newData[(offset * 3) + ii] = index[ii];
}
}
}
}else{
for(int ii=0;ii<3;ii++) {
newData[((offset) * 3) + ii] = 0;
}
}
}
}
imageData.setCompCount(3);
imageData.setWidth(newW);
imageData.setHeight(newH);
decodeColorData.setIndex(null, 0);
//remap Separation as already converted here
if(decodeColorData.getID()==ColorSpaces.Separation || decodeColorData.getID()==ColorSpaces.DeviceN){
decodeColorData=new DeviceRGBColorSpace();
}
imageData.setObjectData(newData);
imageData.setDepth(8);
return decodeColorData;
}
private static int getPixelSetCount(final int sampling, boolean imageMask, final byte[] data, final int[] flag, final int origLineLength,
final int y, final int x, final int wCount, final int hCount) {
byte currentByte;
int bit;
int bytes=0;
int ptr;
for(int yy=0;yy>3);
if(ptr © 2015 - 2025 Weber Informatics LLC | Privacy Policy