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/*
* Copyright 2003-2008 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*
* This code is based on a series of source files originally released
* by SUN in the context of the JAI project. The original code was released
* under the BSD license in a specific wording. In a mail dating from
* January 23, 2008, Brian Burkhalter (@sun.com) gave us permission
* to use the code under the following version of the BSD license:
*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for
* use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
package com.aowagie.text.pdf.codec;
import harmony.java.awt.color.ICC_Profile;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;
import com.aowagie.text.ExceptionConverter;
import com.aowagie.text.Image;
import com.aowagie.text.ImgRaw;
import com.aowagie.text.Utilities;
import com.aowagie.text.pdf.ByteBuffer;
import com.aowagie.text.pdf.PdfArray;
import com.aowagie.text.pdf.PdfDictionary;
import com.aowagie.text.pdf.PdfLiteral;
import com.aowagie.text.pdf.PdfName;
import com.aowagie.text.pdf.PdfNumber;
import com.aowagie.text.pdf.PdfObject;
import com.aowagie.text.pdf.PdfReader;
import com.aowagie.text.pdf.PdfString;
/** Reads a PNG image. All types of PNG can be read.
*
* It is based in part in the JAI codec.
*
* @author Paulo Soares ([email protected])
*/
public class PngImage {
/** Some PNG specific values. */
public static final int[] PNGID = {137, 80, 78, 71, 13, 10, 26, 10};
/** A PNG marker. */
private static final String IHDR = "IHDR";
/** A PNG marker. */
private static final String PLTE = "PLTE";
/** A PNG marker. */
private static final String IDAT = "IDAT";
/** A PNG marker. */
private static final String IEND = "IEND";
/** A PNG marker. */
private static final String tRNS = "tRNS";
/** A PNG marker. */
private static final String pHYs = "pHYs";
/** A PNG marker. */
private static final String gAMA = "gAMA";
/** A PNG marker. */
private static final String cHRM = "cHRM";
/** A PNG marker. */
private static final String sRGB = "sRGB";
/** A PNG marker. */
private static final String iCCP = "iCCP";
private static final int TRANSFERSIZE = 4096;
private static final int PNG_FILTER_NONE = 0;
private static final int PNG_FILTER_SUB = 1;
private static final int PNG_FILTER_UP = 2;
private static final int PNG_FILTER_AVERAGE = 3;
private static final int PNG_FILTER_PAETH = 4;
private static final PdfName intents[] = {PdfName.PERCEPTUAL,
PdfName.RELATIVECOLORIMETRIC,PdfName.SATURATION,PdfName.ABSOLUTECOLORIMETRIC};
private final InputStream is;
private DataInputStream dataStream;
private int width;
private int height;
private int bitDepth;
private int colorType;
private int compressionMethod;
private int filterMethod;
private int interlaceMethod;
private final PdfDictionary additional = new PdfDictionary();
private byte image[];
private byte smask[];
private byte trans[];
private final NewByteArrayOutputStream idat = new NewByteArrayOutputStream();
private int dpiX;
private int dpiY;
private float XYRatio;
private boolean genBWMask;
private boolean palShades;
private int transRedGray = -1;
private int transGreen = -1;
private int transBlue = -1;
private int inputBands;
private int bytesPerPixel; // number of bytes per input pixel
private byte colorTable[];
private float gamma = 1f;
private boolean hasCHRM = false;
private float xW, yW, xR, yR, xG, yG, xB, yB;
private PdfName intent;
private ICC_Profile icc_profile;
/** Creates a new instance of PngImage */
private PngImage(final InputStream is) {
this.is = is;
}
/** Reads a PNG from an url.
* @param url the url
* @throws IOException on error
* @return the image
*/
public static Image getImage(final URL url) throws IOException {
InputStream is = null;
try {
is = url.openStream();
final Image img = getImage(is);
img.setUrl(url);
return img;
}
finally {
if (is != null) {
is.close();
}
}
}
/** Reads a PNG from a stream.
* @param is the stream
* @throws IOException on error
* @return the image
*/
private static Image getImage(final InputStream is) throws IOException {
final PngImage png = new PngImage(is);
return png.getImage();
}
/** Reads a PNG from a byte array.
* @param data the byte array
* @throws IOException on error
* @return the image
*/
public static Image getImage(final byte data[]) throws IOException {
final ByteArrayInputStream is = new ByteArrayInputStream(data);
final Image img = getImage(is);
img.setOriginalData(data);
return img;
}
private boolean checkMarker(final String s) {
if (s.length() != 4) {
return false;
}
for (int k = 0; k < 4; ++k) {
final char c = s.charAt(k);
if ((c < 'a' || c > 'z') && (c < 'A' || c > 'Z')) {
return false;
}
}
return true;
}
private void readPng() throws IOException {
for (final int element : PNGID) {
if (element != this.is.read()) {
throw new IOException("File is not a valid PNG.");
}
}
final byte buffer[] = new byte[TRANSFERSIZE];
while (true) {
int len = getInt(this.is);
final String marker = getString(this.is);
if (len < 0 || !checkMarker(marker)) {
throw new IOException("Corrupted PNG file.");
}
if (IDAT.equals(marker)) {
int size;
while (len != 0) {
size = this.is.read(buffer, 0, Math.min(len, TRANSFERSIZE));
if (size < 0) {
return;
}
this.idat.write(buffer, 0, size);
len -= size;
}
}
else if (tRNS.equals(marker)) {
switch (this.colorType) {
case 0:
if (len >= 2) {
len -= 2;
final int gray = getWord(this.is);
if (this.bitDepth == 16) {
this.transRedGray = gray;
} else {
this.additional.put(PdfName.MASK, new PdfLiteral("["+gray+" "+gray+"]"));
}
}
break;
case 2:
if (len >= 6) {
len -= 6;
final int red = getWord(this.is);
final int green = getWord(this.is);
final int blue = getWord(this.is);
if (this.bitDepth == 16) {
this.transRedGray = red;
this.transGreen = green;
this.transBlue = blue;
} else {
this.additional.put(PdfName.MASK, new PdfLiteral("["+red+" "+red+" "+green+" "+green+" "+blue+" "+blue+"]"));
}
}
break;
case 3:
if (len > 0) {
this.trans = new byte[len];
for (int k = 0; k < len; ++k) {
this.trans[k] = (byte)this.is.read();
}
len = 0;
}
break;
}
Utilities.skip(this.is, len);
}
else if (IHDR.equals(marker)) {
this.width = getInt(this.is);
this.height = getInt(this.is);
this.bitDepth = this.is.read();
this.colorType = this.is.read();
this.compressionMethod = this.is.read();
this.filterMethod = this.is.read();
this.interlaceMethod = this.is.read();
}
else if (PLTE.equals(marker)) {
if (this.colorType == 3) {
final PdfArray colorspace = new PdfArray();
colorspace.add(PdfName.INDEXED);
colorspace.add(getColorspace());
colorspace.add(new PdfNumber(len / 3 - 1));
final ByteBuffer colortable = new ByteBuffer();
while (len-- > 0) {
colortable.append_i(this.is.read());
}
colorspace.add(new PdfString(this.colorTable = colortable.toByteArray()));
this.additional.put(PdfName.COLORSPACE, colorspace);
}
else {
Utilities.skip(this.is, len);
}
}
else if (pHYs.equals(marker)) {
final int dx = getInt(this.is);
final int dy = getInt(this.is);
final int unit = this.is.read();
if (unit == 1) {
this.dpiX = (int)(dx * 0.0254f + 0.5f);
this.dpiY = (int)(dy * 0.0254f + 0.5f);
}
else {
if (dy != 0) {
this.XYRatio = (float)dx / (float)dy;
}
}
}
else if (cHRM.equals(marker)) {
this.xW = getInt(this.is) / 100000f;
this.yW = getInt(this.is) / 100000f;
this.xR = getInt(this.is) / 100000f;
this.yR = getInt(this.is) / 100000f;
this.xG = getInt(this.is) / 100000f;
this.yG = getInt(this.is) / 100000f;
this.xB = getInt(this.is) / 100000f;
this.yB = getInt(this.is) / 100000f;
this.hasCHRM = !(Math.abs(this.xW)<0.0001f||Math.abs(this.yW)<0.0001f||Math.abs(this.xR)<0.0001f||Math.abs(this.yR)<0.0001f||Math.abs(this.xG)<0.0001f||Math.abs(this.yG)<0.0001f||Math.abs(this.xB)<0.0001f||Math.abs(this.yB)<0.0001f);
}
else if (sRGB.equals(marker)) {
final int ri = this.is.read();
this.intent = intents[ri];
this.gamma = 2.2f;
this.xW = 0.3127f;
this.yW = 0.329f;
this.xR = 0.64f;
this.yR = 0.33f;
this.xG = 0.3f;
this.yG = 0.6f;
this.xB = 0.15f;
this.yB = 0.06f;
this.hasCHRM = true;
}
else if (gAMA.equals(marker)) {
final int gm = getInt(this.is);
if (gm != 0) {
this.gamma = 100000f / gm;
if (!this.hasCHRM) {
this.xW = 0.3127f;
this.yW = 0.329f;
this.xR = 0.64f;
this.yR = 0.33f;
this.xG = 0.3f;
this.yG = 0.6f;
this.xB = 0.15f;
this.yB = 0.06f;
this.hasCHRM = true;
}
}
}
else if (iCCP.equals(marker)) {
do {
--len;
} while (this.is.read() != 0);
this.is.read();
--len;
byte icccom[] = new byte[len];
int p = 0;
while (len > 0) {
final int r = this.is.read(icccom, p, len);
if (r < 0) {
throw new IOException("Premature end of file.");
}
p += r;
len -= r;
}
final byte iccp[] = PdfReader.FlateDecode(icccom, true);
icccom = null;
try {
this.icc_profile = ICC_Profile.getInstance(iccp);
}
catch (final RuntimeException e) {
this.icc_profile = null;
}
}
else if (IEND.equals(marker)) {
break;
}
else {
Utilities.skip(this.is, len);
}
Utilities.skip(this.is, 4);
}
}
private PdfObject getColorspace() {
if (this.icc_profile != null) {
if ((this.colorType & 2) == 0) {
return PdfName.DEVICEGRAY;
} else {
return PdfName.DEVICERGB;
}
}
if (this.gamma == 1f && !this.hasCHRM) {
if ((this.colorType & 2) == 0) {
return PdfName.DEVICEGRAY;
} else {
return PdfName.DEVICERGB;
}
}
else {
final PdfArray array = new PdfArray();
final PdfDictionary dic = new PdfDictionary();
if ((this.colorType & 2) == 0) {
if (this.gamma == 1f) {
return PdfName.DEVICEGRAY;
}
array.add(PdfName.CALGRAY);
dic.put(PdfName.GAMMA, new PdfNumber(this.gamma));
dic.put(PdfName.WHITEPOINT, new PdfLiteral("[1 1 1]"));
array.add(dic);
}
else {
PdfObject wp = new PdfLiteral("[1 1 1]");
array.add(PdfName.CALRGB);
if (this.gamma != 1f) {
final PdfArray gm = new PdfArray();
final PdfNumber n = new PdfNumber(this.gamma);
gm.add(n);
gm.add(n);
gm.add(n);
dic.put(PdfName.GAMMA, gm);
}
if (this.hasCHRM) {
final float z = this.yW*((this.xG-this.xB)*this.yR-(this.xR-this.xB)*this.yG+(this.xR-this.xG)*this.yB);
final float YA = this.yR*((this.xG-this.xB)*this.yW-(this.xW-this.xB)*this.yG+(this.xW-this.xG)*this.yB)/z;
final float XA = YA*this.xR/this.yR;
final float ZA = YA*((1-this.xR)/this.yR-1);
final float YB = -this.yG*((this.xR-this.xB)*this.yW-(this.xW-this.xB)*this.yR+(this.xW-this.xR)*this.yB)/z;
final float XB = YB*this.xG/this.yG;
final float ZB = YB*((1-this.xG)/this.yG-1);
final float YC = this.yB*((this.xR-this.xG)*this.yW-(this.xW-this.xG)*this.yW+(this.xW-this.xR)*this.yG)/z;
final float XC = YC*this.xB/this.yB;
final float ZC = YC*((1-this.xB)/this.yB-1);
final float XW = XA+XB+XC;
final float YW = 1;//YA+YB+YC;
final float ZW = ZA+ZB+ZC;
final PdfArray wpa = new PdfArray();
wpa.add(new PdfNumber(XW));
wpa.add(new PdfNumber(YW));
wpa.add(new PdfNumber(ZW));
wp = wpa;
final PdfArray matrix = new PdfArray();
matrix.add(new PdfNumber(XA));
matrix.add(new PdfNumber(YA));
matrix.add(new PdfNumber(ZA));
matrix.add(new PdfNumber(XB));
matrix.add(new PdfNumber(YB));
matrix.add(new PdfNumber(ZB));
matrix.add(new PdfNumber(XC));
matrix.add(new PdfNumber(YC));
matrix.add(new PdfNumber(ZC));
dic.put(PdfName.MATRIX, matrix);
}
dic.put(PdfName.WHITEPOINT, wp);
array.add(dic);
}
return array;
}
}
private Image getImage() throws IOException {
readPng();
try {
int pal0 = 0;
int palIdx = 0;
this.palShades = false;
if (this.trans != null) {
for (int k = 0; k < this.trans.length; ++k) {
final int n = this.trans[k] & 0xff;
if (n == 0) {
++pal0;
palIdx = k;
}
if (n != 0 && n != 255) {
this.palShades = true;
break;
}
}
}
if ((this.colorType & 4) != 0) {
this.palShades = true;
}
this.genBWMask = !this.palShades && (pal0 > 1 || this.transRedGray >= 0);
if (!this.palShades && !this.genBWMask && pal0 == 1) {
this.additional.put(PdfName.MASK, new PdfLiteral("["+palIdx+" "+palIdx+"]"));
}
final boolean needDecode = this.interlaceMethod == 1 || this.bitDepth == 16 || (this.colorType & 4) != 0 || this.palShades || this.genBWMask;
switch (this.colorType) {
case 0:
this.inputBands = 1;
break;
case 2:
this.inputBands = 3;
break;
case 3:
this.inputBands = 1;
break;
case 4:
this.inputBands = 2;
break;
case 6:
this.inputBands = 4;
break;
}
if (needDecode) {
decodeIdat();
}
int components = this.inputBands;
if ((this.colorType & 4) != 0) {
--components;
}
int bpc = this.bitDepth;
if (bpc == 16) {
bpc = 8;
}
Image img;
if (this.image != null) {
if (this.colorType == 3) {
img = new ImgRaw(this.width, this.height, components, bpc, this.image);
} else {
img = Image.getInstance(this.width, this.height, components, bpc, this.image);
}
}
else {
img = new ImgRaw(this.width, this.height, components, bpc, this.idat.toByteArray());
img.setDeflated(true);
final PdfDictionary decodeparms = new PdfDictionary();
decodeparms.put(PdfName.BITSPERCOMPONENT, new PdfNumber(this.bitDepth));
decodeparms.put(PdfName.PREDICTOR, new PdfNumber(15));
decodeparms.put(PdfName.COLUMNS, new PdfNumber(this.width));
decodeparms.put(PdfName.COLORS, new PdfNumber(this.colorType == 3 || (this.colorType & 2) == 0 ? 1 : 3));
this.additional.put(PdfName.DECODEPARMS, decodeparms);
}
if (this.additional.get(PdfName.COLORSPACE) == null) {
this.additional.put(PdfName.COLORSPACE, getColorspace());
}
if (this.intent != null) {
this.additional.put(PdfName.INTENT, this.intent);
}
if (this.additional.size() > 0) {
img.setAdditional(this.additional);
}
if (this.icc_profile != null) {
img.tagICC(this.icc_profile);
}
if (this.palShades) {
final Image im2 = Image.getInstance(this.width, this.height, 1, 8, this.smask);
im2.makeMask();
img.setImageMask(im2);
}
if (this.genBWMask) {
final Image im2 = Image.getInstance(this.width, this.height, 1, 1, this.smask);
im2.makeMask();
img.setImageMask(im2);
}
img.setDpi(this.dpiX, this.dpiY);
img.setXYRatio(this.XYRatio);
img.setOriginalType(Image.ORIGINAL_PNG);
return img;
}
catch (final Exception e) {
throw new ExceptionConverter(e);
}
}
private void decodeIdat() {
int nbitDepth = this.bitDepth;
if (nbitDepth == 16) {
nbitDepth = 8;
}
int size = -1;
this.bytesPerPixel = this.bitDepth == 16 ? 2 : 1;
switch (this.colorType) {
case 0:
size = (nbitDepth * this.width + 7) / 8 * this.height;
break;
case 2:
size = this.width * 3 * this.height;
this.bytesPerPixel *= 3;
break;
case 3:
if (this.interlaceMethod == 1) {
size = (nbitDepth * this.width + 7) / 8 * this.height;
}
this.bytesPerPixel = 1;
break;
case 4:
size = this.width * this.height;
this.bytesPerPixel *= 2;
break;
case 6:
size = this.width * 3 * this.height;
this.bytesPerPixel *= 4;
break;
}
if (size >= 0) {
this.image = new byte[size];
}
if (this.palShades) {
this.smask = new byte[this.width * this.height];
} else if (this.genBWMask) {
this.smask = new byte[(this.width + 7) / 8 * this.height];
}
final ByteArrayInputStream bai = new ByteArrayInputStream(this.idat.getBuf(), 0, this.idat.size());
final InputStream infStream = new InflaterInputStream(bai, new Inflater());
this.dataStream = new DataInputStream(infStream);
if (this.interlaceMethod != 1) {
decodePass(0, 0, 1, 1, this.width, this.height);
}
else {
decodePass(0, 0, 8, 8, (this.width + 7)/8, (this.height + 7)/8);
decodePass(4, 0, 8, 8, (this.width + 3)/8, (this.height + 7)/8);
decodePass(0, 4, 4, 8, (this.width + 3)/4, (this.height + 3)/8);
decodePass(2, 0, 4, 4, (this.width + 1)/4, (this.height + 3)/4);
decodePass(0, 2, 2, 4, (this.width + 1)/2, (this.height + 1)/4);
decodePass(1, 0, 2, 2, this.width/2, (this.height + 1)/2);
decodePass(0, 1, 1, 2, this.width, this.height/2);
}
}
private void decodePass( final int xOffset, final int yOffset,
final int xStep, final int yStep,
final int passWidth, final int passHeight) {
if (passWidth == 0 || passHeight == 0) {
return;
}
final int bytesPerRow = (this.inputBands*passWidth*this.bitDepth + 7)/8;
byte[] curr = new byte[bytesPerRow];
byte[] prior = new byte[bytesPerRow];
// Decode the (sub)image row-by-row
int srcY, dstY;
for (srcY = 0, dstY = yOffset;
srcY < passHeight;
srcY++, dstY += yStep) {
// Read the filter type byte and a row of data
int filter = 0;
try {
filter = this.dataStream.read();
this.dataStream.readFully(curr, 0, bytesPerRow);
} catch (final Exception e) {
// empty on purpose
}
switch (filter) {
case PNG_FILTER_NONE:
break;
case PNG_FILTER_SUB:
decodeSubFilter(curr, bytesPerRow, this.bytesPerPixel);
break;
case PNG_FILTER_UP:
decodeUpFilter(curr, prior, bytesPerRow);
break;
case PNG_FILTER_AVERAGE:
decodeAverageFilter(curr, prior, bytesPerRow, this.bytesPerPixel);
break;
case PNG_FILTER_PAETH:
decodePaethFilter(curr, prior, bytesPerRow, this.bytesPerPixel);
break;
default:
// Error -- uknown filter type
throw new RuntimeException("PNG filter unknown.");
}
processPixels(curr, xOffset, xStep, dstY, passWidth);
// Swap curr and prior
final byte[] tmp = prior;
prior = curr;
curr = tmp;
}
}
private void processPixels(final byte curr[], final int xOffset, final int step, final int y, final int width) {
int srcX, dstX;
final int out[] = getPixel(curr);
int sizes = 0;
switch (this.colorType) {
case 0:
case 3:
case 4:
sizes = 1;
break;
case 2:
case 6:
sizes = 3;
break;
}
if (this.image != null) {
dstX = xOffset;
final int yStride = (sizes*this.width*(this.bitDepth == 16 ? 8 : this.bitDepth)+ 7)/8;
for (srcX = 0; srcX < width; srcX++) {
setPixel(this.image, out, this.inputBands * srcX, sizes, dstX, y, this.bitDepth, yStride);
dstX += step;
}
}
if (this.palShades) {
if ((this.colorType & 4) != 0) {
if (this.bitDepth == 16) {
for (int k = 0; k < width; ++k) {
out[k * this.inputBands + sizes] >>>= 8;
}
}
final int yStride = this.width;
dstX = xOffset;
for (srcX = 0; srcX < width; srcX++) {
setPixel(this.smask, out, this.inputBands * srcX + sizes, 1, dstX, y, 8, yStride);
dstX += step;
}
}
else { //colorType 3
final int yStride = this.width;
final int v[] = new int[1];
dstX = xOffset;
for (srcX = 0; srcX < width; srcX++) {
final int idx = out[srcX];
if (idx < this.trans.length) {
v[0] = this.trans[idx];
}
else {
v[0] = 255; // Patrick Valsecchi
}
setPixel(this.smask, v, 0, 1, dstX, y, 8, yStride);
dstX += step;
}
}
}
else if (this.genBWMask) {
switch (this.colorType) {
case 3: {
final int yStride = (this.width + 7) / 8;
final int v[] = new int[1];
dstX = xOffset;
for (srcX = 0; srcX < width; srcX++) {
final int idx = out[srcX];
v[0] = idx < this.trans.length && this.trans[idx] == 0 ? 1 : 0;
setPixel(this.smask, v, 0, 1, dstX, y, 1, yStride);
dstX += step;
}
break;
}
case 0: {
final int yStride = (this.width + 7) / 8;
final int v[] = new int[1];
dstX = xOffset;
for (srcX = 0; srcX < width; srcX++) {
final int g = out[srcX];
v[0] = g == this.transRedGray ? 1 : 0;
setPixel(this.smask, v, 0, 1, dstX, y, 1, yStride);
dstX += step;
}
break;
}
case 2: {
final int yStride = (this.width + 7) / 8;
final int v[] = new int[1];
dstX = xOffset;
for (srcX = 0; srcX < width; srcX++) {
final int markRed = this.inputBands * srcX;
v[0] = out[markRed] == this.transRedGray && out[markRed + 1] == this.transGreen
&& out[markRed + 2] == this.transBlue ? 1 : 0;
setPixel(this.smask, v, 0, 1, dstX, y, 1, yStride);
dstX += step;
}
break;
}
}
}
}
private static void setPixel(final byte image[], final int data[], final int offset, final int size, final int x, final int y, final int bitDepth, final int bytesPerRow) {
if (bitDepth == 8) {
final int pos = bytesPerRow * y + size * x;
for (int k = 0; k < size; ++k) {
image[pos + k] = (byte)data[k + offset];
}
}
else if (bitDepth == 16) {
final int pos = bytesPerRow * y + size * x;
for (int k = 0; k < size; ++k) {
image[pos + k] = (byte)(data[k + offset] >>> 8);
}
}
else {
final int pos = bytesPerRow * y + x / (8 / bitDepth);
final int v = data[offset] << 8 - bitDepth * (x % (8 / bitDepth))- bitDepth;
image[pos] |= v;
}
}
private int[] getPixel(final byte curr[]) {
switch (this.bitDepth) {
case 8: {
final int out[] = new int[curr.length];
for (int k = 0; k < out.length; ++k) {
out[k] = curr[k] & 0xff;
}
return out;
}
case 16: {
final int out[] = new int[curr.length / 2];
for (int k = 0; k < out.length; ++k) {
out[k] = ((curr[k * 2] & 0xff) << 8) + (curr[k * 2 + 1] & 0xff);
}
return out;
}
default: {
final int out[] = new int[curr.length * 8 / this.bitDepth];
int idx = 0;
final int passes = 8 / this.bitDepth;
final int mask = (1 << this.bitDepth) - 1;
for (final byte element : curr) {
for (int j = passes - 1; j >= 0; --j) {
out[idx++] = element >>> this.bitDepth * j & mask;
}
}
return out;
}
}
}
private static void decodeSubFilter(final byte[] curr, final int count, final int bpp) {
for (int i = bpp; i < count; i++) {
int val;
val = curr[i] & 0xff;
val += curr[i - bpp] & 0xff;
curr[i] = (byte)val;
}
}
private static void decodeUpFilter(final byte[] curr, final byte[] prev,
final int count) {
for (int i = 0; i < count; i++) {
final int raw = curr[i] & 0xff;
final int prior = prev[i] & 0xff;
curr[i] = (byte)(raw + prior);
}
}
private static void decodeAverageFilter(final byte[] curr, final byte[] prev,
final int count, final int bpp) {
int raw, priorPixel, priorRow;
for (int i = 0; i < bpp; i++) {
raw = curr[i] & 0xff;
priorRow = prev[i] & 0xff;
curr[i] = (byte)(raw + priorRow/2);
}
for (int i = bpp; i < count; i++) {
raw = curr[i] & 0xff;
priorPixel = curr[i - bpp] & 0xff;
priorRow = prev[i] & 0xff;
curr[i] = (byte)(raw + (priorPixel + priorRow)/2);
}
}
private static int paethPredictor(final int a, final int b, final int c) {
final int p = a + b - c;
final int pa = Math.abs(p - a);
final int pb = Math.abs(p - b);
final int pc = Math.abs(p - c);
if (pa <= pb && pa <= pc) {
return a;
} else if (pb <= pc) {
return b;
} else {
return c;
}
}
private static void decodePaethFilter(final byte[] curr, final byte[] prev,
final int count, final int bpp) {
int raw, priorPixel, priorRow, priorRowPixel;
for (int i = 0; i < bpp; i++) {
raw = curr[i] & 0xff;
priorRow = prev[i] & 0xff;
curr[i] = (byte)(raw + priorRow);
}
for (int i = bpp; i < count; i++) {
raw = curr[i] & 0xff;
priorPixel = curr[i - bpp] & 0xff;
priorRow = prev[i] & 0xff;
priorRowPixel = prev[i - bpp] & 0xff;
curr[i] = (byte)(raw + paethPredictor(priorPixel,
priorRow,
priorRowPixel));
}
}
private static class NewByteArrayOutputStream extends ByteArrayOutputStream {
public byte[] getBuf() {
return this.buf;
}
}
/**
* Gets an int from an InputStream.
*
* @param is an InputStream
* @return the value of an int
*/
private static final int getInt(final InputStream is) throws IOException {
return (is.read() << 24) + (is.read() << 16) + (is.read() << 8) + is.read();
}
/**
* Gets a word from an InputStream.
*
* @param is an InputStream
* @return the value of an int
*/
private static final int getWord(final InputStream is) throws IOException {
return (is.read() << 8) + is.read();
}
/**
* Gets a String from an InputStream.
*
* @param is an InputStream
* @return the value of an int
*/
private static final String getString(final InputStream is) throws IOException {
final StringBuffer buf = new StringBuffer();
for (int i = 0; i < 4; i++) {
buf.append((char)is.read());
}
return buf.toString();
}
}