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/*
* ===========================================
* 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 {
public static GenericColorSpace downSample(final int sampling, final ImageData imageData, GenericColorSpace decodeColorData) {
final byte[] data = imageData.getObjectData();
final int[] flag = {1, 2, 4, 8, 16, 32, 64, 128};
/* if(sampling>2){
System.out.println("downSample ="+sampling);
int newW=imageData.getWidth()>>1;
int newH=imageData.getHeight()>>1;
final int origLineLength= (imageData.getWidth()+7)>>3;
final int newLineLength= (newW+7)>>3;
int size=(newLineLength*newH);
byte[] newData=new byte[size];
//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(2, false, data, flag, origLineLength, y, x, wCount, hCount);
final int inputByte=(x>>2)+(origLineLength*(y<<2));
final int outputByte=(x>>3)+(newLineLength*y);
if(bytes>3){
//set value as white or average of pixels
// final int outputByte=((x>>1) )+(newLineLength*(y>>2));
newData[outputByte] = (byte) (newData[outputByte] | (flag[7-((x & 7))]));
}
}
}
imageData.setWidth(newW);
imageData.setHeight(newH);
data=newData;
sampling=sampling>>1;
}
System.out.println("downSample ="+sampling);
/**/
final int newW = imageData.getWidth() / sampling;
final int newH = imageData.getHeight() / sampling;
final int size = newW * newH;
final byte[] newData = new byte[size];
final int origLineLength = (imageData.getWidth() + 7) >> 3;
//scan all pixels and down-sample
for (int y = 0; y < newH; y++) {
for (int x = 0; x < newW; x++) {
//allow for edges in number of pixels left
int wCount = sampling, hCount = sampling;
final int wGapLeft = imageData.getWidth() - x;
final int hGapLeft = imageData.getHeight() - y;
if (wCount > wGapLeft) {
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);
imageData.setCompCount(1);
//suggest you add kernel sharpening here
//@bethan
//imageData=KernelUtils.sharpenGrayScale(imageData,w,h);
//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 < count; aa++) {
newData[aa] = (byte) (newData[aa] ^ 255);
}
}
public static GenericColorSpace downSampleMask(final int sampling, final ImageData imageData,
final byte[] maskCol, GenericColorSpace decodeColorData) {
final byte[] data = imageData.getObjectData();
final int newW = imageData.getWidth() / sampling;
final int newH = imageData.getHeight() / sampling;
final int size = newW * newH * 4;
maskCol[3] = (byte) 255;
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; y < newH; y++) {
for (int x = 0; x < newW; x++) {
//allow for edges in number of pixels left
int wCount = sampling, hCount = sampling;
final int wGapLeft = imageData.getWidth() - x;
final int hGapLeft = imageData.getHeight() - y;
if (wCount > wGapLeft) {
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(final int sampling, final ImageData imageData,
final byte[] index, GenericColorSpace decodeColorData) {
final byte[] data = imageData.getObjectData();
final int newW = imageData.getWidth() / sampling;
final int newH = imageData.getHeight() / sampling;
final 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; y < newH; y++) {
for (int x = 0; x < newW; x++) {
//allow for edges in number of pixels left
int wCount = sampling, hCount = sampling;
final int wGapLeft = imageData.getWidth() - x;
final int hGapLeft = imageData.getHeight() - y;
if (wCount > wGapLeft) {
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, final 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 < hCount; yy++) {
for (int xx = 0; xx < wCount; xx++) {
ptr = ((yy + (y * sampling)) * origLineLength) + (((x * sampling) + xx) >> 3);
if (ptr < data.length) {
currentByte = data[ptr];
} else {
currentByte = 0;
}
if (imageMask) {
currentByte = (byte) (currentByte ^ 255);
}
bit = currentByte & flag[7 - (((x * sampling) + xx) & 7)];
if (bit != 0) {
bytes++;
}
}
}
return bytes;
}
}
