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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
*
@LICENSE@
*
* ---------------
* ThreeComponentImage.java
* ---------------
*/
package org.jpedal.parser.image;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.Raster;
import java.util.Arrays;
import org.jpedal.io.ColorSpaceConvertor;
import org.jpedal.utils.LogWriter;
/**
* @author markee
*/
class ThreeComponentImage {
public static BufferedImage make(int d, byte[] data, final byte[] index, final int w, final int h) {
final BufferedImage image;
//some odd files with 16 bit need to be down-sampled to work with 8 bit (fogbugz 15839)
// baseline_screens/14jan/fatt18SKYspeseOND13.pdf
if (d == 16) {
final int origSize = data.length;
final int newSize = origSize / 2;
final byte[] newData = new byte[newSize];
for (int ptr = 0; ptr < newSize; ptr++) {
newData[ptr] = data[ptr * 2];
}
data = newData;
d = 8;
}
LogWriter.writeLog("Converting 3 comp colorspace to sRGB index=" + Arrays.toString(index));
//work out from size what sort of image data we have
if (w * h == data.length) {
image = makeIndexImage(d, index, w, h, data);
} else {
LogWriter.writeLog("Converting data to sRGB " + data.length + " depth=" + d);
image = makeImage(d, data, w, h);
}
return image;
}
static BufferedImage makeImage(final int d, byte[] data, final int w, final int h) {
//expand out 4 bit raster as does not appear to be easy way
if (d == 4) {
data = expand4bitData(data, w, h);
}
final BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
data = checkSize(data, w, h, 3);
final Raster raster = ColorSpaceConvertor.createInterleavedRaster(data, w, h);
image.setData(raster);
return image;
}
static byte[] expand4bitData(byte[] data, final int w, final int h) {
final int origSize = data.length;
final int newSize = w * h * 3;
final boolean isOdd = (w & 1) == 1;
final int scanLine = ((w * 3) + 1) >> 1;
final byte[] newData = new byte[newSize];
byte rawByte;
int ptr = 0, currentLine = 0;
for (int ii = 0; ii < origSize; ii++) {
rawByte = data[ii];
currentLine++;
newData[ptr] = (byte) (rawByte & 240);
if (newData[ptr] == -16) { //fix for white
newData[ptr] = (byte) 255;
}
ptr++;
if ((currentLine) == scanLine && isOdd) { //ignore pack bit at end of odd line
currentLine = 0;
} else {
newData[ptr] = (byte) ((rawByte & 15) << 4);
if (newData[ptr] == -16) //fix for white
{
newData[ptr] = (byte) 255;
}
ptr++;
}
if (ptr == newSize) {
ii = origSize;
}
}
data = newData;
return data;
}
static BufferedImage makeIndexImage(final int d, final byte[] index, final int w, final int h, final byte[] data) {
final BufferedImage image;
if (d == 8 && index != null) {
image = ColorSpaceConvertor.convertIndexedToFlat(d, w, h, data, index, false, false);
} else {
final DataBuffer db = new DataBufferByte(data, data.length);
final int[] bands = {0};
image = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_GRAY);
final Raster raster = Raster.createInterleavedRaster(db, w, h, w, 1, bands, null);
image.setData(raster);
}
return image;
}
private static byte[] checkSize(byte[] data, final int w, final int h, final int comp) {
final int correctSize = w * h * comp;
if (data.length < correctSize) {
final byte[] newData = new byte[correctSize];
System.arraycopy(data, 0, newData, 0, data.length);
data = newData;
}
return data;
}
}