Java tutorial
/* * * This file is part of the iText (R) project. * Copyright (c) 1998-2015 iText Group NV * Authors: Bruno Lowagie, Paulo Soares, et al. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License version 3 * as published by the Free Software Foundation with the addition of the * following permission added to Section 15 as permitted in Section 7(a): * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY * ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT * OF THIRD PARTY RIGHTS * * This program 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 Affero General Public License for more details. * You should have received a copy of the GNU Affero General Public License * along with this program; if not, see http://www.gnu.org/licenses or write to * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * Boston, MA, 02110-1301 USA, or download the license from the following URL: * http://itextpdf.com/terms-of-use/ * * The interactive user interfaces in modified source and object code versions * of this program must display Appropriate Legal Notices, as required under * Section 5 of the GNU Affero General Public License. * * In accordance with Section 7(b) of the GNU Affero General Public License, * a covered work must retain the producer line in every PDF that is created * or manipulated using iText. * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial activities involving the iText software without * disclosing the source code of your own applications. * These activities include: offering paid services to customers as an ASP, * serving PDFs on the fly in a web application, shipping iText with a closed * source product. * * For more information, please contact iText Software Corp. at this * address: sales@itextpdf.com */ /* * 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.itextpdf.text.pdf.codec; import com.itextpdf.text.ExceptionConverter; import com.itextpdf.text.Image; import com.itextpdf.text.ImgRaw; import com.itextpdf.text.Utilities; import com.itextpdf.text.error_messages.MessageLocalization; import com.itextpdf.text.log.Logger; import com.itextpdf.text.log.LoggerFactory; import com.itextpdf.text.pdf.ByteBuffer; import com.itextpdf.text.pdf.ICC_Profile; import com.itextpdf.text.pdf.PdfArray; import com.itextpdf.text.pdf.PdfDictionary; import com.itextpdf.text.pdf.PdfLiteral; import com.itextpdf.text.pdf.PdfName; import com.itextpdf.text.pdf.PdfNumber; import com.itextpdf.text.pdf.PdfObject; import com.itextpdf.text.pdf.PdfReader; import com.itextpdf.text.pdf.PdfString; 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; /** Reads a PNG image. All types of PNG can be read. * <p> * It is based in part in the JAI codec. * * @author Paulo Soares */ public class PngImage { /** Some PNG specific values. */ public static final int[] PNGID = { 137, 80, 78, 71, 13, 10, 26, 10 }; /** A PNG marker. */ public static final String IHDR = "IHDR"; /** A PNG marker. */ public static final String PLTE = "PLTE"; /** A PNG marker. */ public static final String IDAT = "IDAT"; /** A PNG marker. */ public static final String IEND = "IEND"; /** A PNG marker. */ public static final String tRNS = "tRNS"; /** A PNG marker. */ public static final String pHYs = "pHYs"; /** A PNG marker. */ public static final String gAMA = "gAMA"; /** A PNG marker. */ public static final String cHRM = "cHRM"; /** A PNG marker. */ public static final String sRGB = "sRGB"; /** A PNG marker. */ public 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 }; InputStream is; DataInputStream dataStream; int width; int height; int bitDepth; int colorType; int compressionMethod; int filterMethod; int interlaceMethod; PdfDictionary additional = new PdfDictionary(); byte image[]; byte smask[]; byte trans[]; NewByteArrayOutputStream idat = new NewByteArrayOutputStream(); int dpiX; int dpiY; float XYRatio; boolean genBWMask; boolean palShades; int transRedGray = -1; int transGreen = -1; int transBlue = -1; int inputBands; int bytesPerPixel; // number of bytes per input pixel byte colorTable[]; float gamma = 1f; boolean hasCHRM = false; float xW, yW, xR, yR, xG, yG, xB, yB; PdfName intent; ICC_Profile icc_profile; /** Creates a new instance of PngImage */ PngImage(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(URL url) throws IOException { InputStream is = null; try { is = url.openStream(); 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 */ public static Image getImage(InputStream is) throws IOException { PngImage png = new PngImage(is); return png.getImage(); } /** Reads a PNG from a file. * @param file the file * @throws IOException on error * @return the image */ public static Image getImage(String file) throws IOException { return getImage(Utilities.toURL(file)); } /** Reads a PNG from a byte array. * @param data the byte array * @throws IOException on error * @return the image */ public static Image getImage(byte data[]) throws IOException { ByteArrayInputStream is = new ByteArrayInputStream(data); Image img = getImage(is); img.setOriginalData(data); return img; } boolean checkMarker(String s) { if (s.length() != 4) return false; for (int k = 0; k < 4; ++k) { char c = s.charAt(k); if ((c < 'a' || c > 'z') && (c < 'A' || c > 'Z')) return false; } return true; } void readPng() throws IOException { for (int i = 0; i < PNGID.length; i++) { if (PNGID[i] != is.read()) { throw new IOException(MessageLocalization.getComposedMessage("file.is.not.a.valid.png")); } } byte buffer[] = new byte[TRANSFERSIZE]; while (true) { int len = getInt(is); String marker = getString(is); if (len < 0 || !checkMarker(marker)) throw new IOException(MessageLocalization.getComposedMessage("corrupted.png.file")); if (IDAT.equals(marker)) { int size; while (len != 0) { size = is.read(buffer, 0, Math.min(len, TRANSFERSIZE)); if (size < 0) return; idat.write(buffer, 0, size); len -= size; } } else if (tRNS.equals(marker)) { switch (colorType) { case 0: if (len >= 2) { len -= 2; int gray = getWord(is); if (bitDepth == 16) transRedGray = gray; else additional.put(PdfName.MASK, new PdfLiteral("[" + gray + " " + gray + "]")); } break; case 2: if (len >= 6) { len -= 6; int red = getWord(is); int green = getWord(is); int blue = getWord(is); if (bitDepth == 16) { transRedGray = red; transGreen = green; transBlue = blue; } else additional.put(PdfName.MASK, new PdfLiteral("[" + red + " " + red + " " + green + " " + green + " " + blue + " " + blue + "]")); } break; case 3: if (len > 0) { trans = new byte[len]; for (int k = 0; k < len; ++k) trans[k] = (byte) is.read(); len = 0; } break; } Utilities.skip(is, len); } else if (IHDR.equals(marker)) { width = getInt(is); height = getInt(is); bitDepth = is.read(); colorType = is.read(); compressionMethod = is.read(); filterMethod = is.read(); interlaceMethod = is.read(); } else if (PLTE.equals(marker)) { if (colorType == 3) { PdfArray colorspace = new PdfArray(); colorspace.add(PdfName.INDEXED); colorspace.add(getColorspace()); colorspace.add(new PdfNumber(len / 3 - 1)); ByteBuffer colortable = new ByteBuffer(); while ((len--) > 0) { colortable.append_i(is.read()); } colorspace.add(new PdfString(colorTable = colortable.toByteArray())); additional.put(PdfName.COLORSPACE, colorspace); } else { Utilities.skip(is, len); } } else if (pHYs.equals(marker)) { int dx = getInt(is); int dy = getInt(is); int unit = is.read(); if (unit == 1) { dpiX = (int) (dx * 0.0254f + 0.5f); dpiY = (int) (dy * 0.0254f + 0.5f); } else { if (dy != 0) XYRatio = (float) dx / (float) dy; } } else if (cHRM.equals(marker)) { xW = getInt(is) / 100000f; yW = getInt(is) / 100000f; xR = getInt(is) / 100000f; yR = getInt(is) / 100000f; xG = getInt(is) / 100000f; yG = getInt(is) / 100000f; xB = getInt(is) / 100000f; yB = getInt(is) / 100000f; hasCHRM = !(Math.abs(xW) < 0.0001f || Math.abs(yW) < 0.0001f || Math.abs(xR) < 0.0001f || Math.abs(yR) < 0.0001f || Math.abs(xG) < 0.0001f || Math.abs(yG) < 0.0001f || Math.abs(xB) < 0.0001f || Math.abs(yB) < 0.0001f); } else if (sRGB.equals(marker)) { int ri = is.read(); intent = intents[ri]; gamma = 2.2f; xW = 0.3127f; yW = 0.329f; xR = 0.64f; yR = 0.33f; xG = 0.3f; yG = 0.6f; xB = 0.15f; yB = 0.06f; hasCHRM = true; } else if (gAMA.equals(marker)) { int gm = getInt(is); if (gm != 0) { gamma = 100000f / gm; if (!hasCHRM) { xW = 0.3127f; yW = 0.329f; xR = 0.64f; yR = 0.33f; xG = 0.3f; yG = 0.6f; xB = 0.15f; yB = 0.06f; hasCHRM = true; } } } else if (iCCP.equals(marker)) { do { --len; } while (is.read() != 0); is.read(); --len; byte icccom[] = new byte[len]; int p = 0; while (len > 0) { int r = is.read(icccom, p, len); if (r < 0) throw new IOException(MessageLocalization.getComposedMessage("premature.end.of.file")); p += r; len -= r; } byte iccp[] = PdfReader.FlateDecode(icccom, true); icccom = null; try { icc_profile = ICC_Profile.getInstance(iccp); } catch (RuntimeException e) { icc_profile = null; } } else if (IEND.equals(marker)) { break; } else { Utilities.skip(is, len); } Utilities.skip(is, 4); } } PdfObject getColorspace() { if (icc_profile != null) { if ((colorType & 2) == 0) return PdfName.DEVICEGRAY; else return PdfName.DEVICERGB; } if (gamma == 1f && !hasCHRM) { if ((colorType & 2) == 0) return PdfName.DEVICEGRAY; else return PdfName.DEVICERGB; } else { PdfArray array = new PdfArray(); PdfDictionary dic = new PdfDictionary(); if ((colorType & 2) == 0) { if (gamma == 1f) return PdfName.DEVICEGRAY; array.add(PdfName.CALGRAY); dic.put(PdfName.GAMMA, new PdfNumber(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 (gamma != 1f) { PdfArray gm = new PdfArray(); PdfNumber n = new PdfNumber(gamma); gm.add(n); gm.add(n); gm.add(n); dic.put(PdfName.GAMMA, gm); } if (hasCHRM) { float z = yW * ((xG - xB) * yR - (xR - xB) * yG + (xR - xG) * yB); float YA = yR * ((xG - xB) * yW - (xW - xB) * yG + (xW - xG) * yB) / z; float XA = YA * xR / yR; float ZA = YA * ((1 - xR) / yR - 1); float YB = -yG * ((xR - xB) * yW - (xW - xB) * yR + (xW - xR) * yB) / z; float XB = YB * xG / yG; float ZB = YB * ((1 - xG) / yG - 1); float YC = yB * ((xR - xG) * yW - (xW - xG) * yW + (xW - xR) * yG) / z; float XC = YC * xB / yB; float ZC = YC * ((1 - xB) / yB - 1); float XW = XA + XB + XC; float YW = 1;//YA+YB+YC; float ZW = ZA + ZB + ZC; PdfArray wpa = new PdfArray(); wpa.add(new PdfNumber(XW)); wpa.add(new PdfNumber(YW)); wpa.add(new PdfNumber(ZW)); wp = wpa; 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; } } Image getImage() throws IOException { readPng(); checkIccProfile(); try { int pal0 = 0; int palIdx = 0; palShades = false; if (trans != null) { for (int k = 0; k < trans.length; ++k) { int n = trans[k] & 0xff; if (n == 0) { ++pal0; palIdx = k; } if (n != 0 && n != 255) { palShades = true; break; } } } if ((colorType & 4) != 0) palShades = true; genBWMask = (!palShades && (pal0 > 1 || transRedGray >= 0)); if (!palShades && !genBWMask && pal0 == 1) { additional.put(PdfName.MASK, new PdfLiteral("[" + palIdx + " " + palIdx + "]")); } boolean needDecode = (interlaceMethod == 1) || (bitDepth == 16) || ((colorType & 4) != 0) || palShades || genBWMask; switch (colorType) { case 0: inputBands = 1; break; case 2: inputBands = 3; break; case 3: inputBands = 1; break; case 4: inputBands = 2; break; case 6: inputBands = 4; break; } if (needDecode) decodeIdat(); int components = inputBands; if ((colorType & 4) != 0) --components; int bpc = bitDepth; if (bpc == 16) bpc = 8; Image img; if (image != null) { if (colorType == 3) img = new ImgRaw(width, height, components, bpc, image); else img = Image.getInstance(width, height, components, bpc, image); } else { img = new ImgRaw(width, height, components, bpc, idat.toByteArray()); img.setDeflated(true); PdfDictionary decodeparms = new PdfDictionary(); decodeparms.put(PdfName.BITSPERCOMPONENT, new PdfNumber(bitDepth)); decodeparms.put(PdfName.PREDICTOR, new PdfNumber(15)); decodeparms.put(PdfName.COLUMNS, new PdfNumber(width)); decodeparms.put(PdfName.COLORS, new PdfNumber((colorType == 3 || (colorType & 2) == 0) ? 1 : 3)); additional.put(PdfName.DECODEPARMS, decodeparms); } if (additional.get(PdfName.COLORSPACE) == null) additional.put(PdfName.COLORSPACE, getColorspace()); if (intent != null) additional.put(PdfName.INTENT, intent); if (additional.size() > 0) img.setAdditional(additional); if (icc_profile != null) img.tagICC(icc_profile); if (palShades) { Image im2 = Image.getInstance(width, height, 1, 8, smask); im2.makeMask(); img.setImageMask(im2); } if (genBWMask) { Image im2 = Image.getInstance(width, height, 1, 1, smask); im2.makeMask(); img.setImageMask(im2); } img.setDpi(dpiX, dpiY); img.setXYRatio(XYRatio); img.setOriginalType(Image.ORIGINAL_PNG); return img; } catch (Exception e) { throw new ExceptionConverter(e); } } void decodeIdat() { int nbitDepth = bitDepth; if (nbitDepth == 16) nbitDepth = 8; int size = -1; bytesPerPixel = (bitDepth == 16) ? 2 : 1; switch (colorType) { case 0: size = (nbitDepth * width + 7) / 8 * height; break; case 2: size = width * 3 * height; bytesPerPixel *= 3; break; case 3: if (interlaceMethod == 1) size = (nbitDepth * width + 7) / 8 * height; bytesPerPixel = 1; break; case 4: size = width * height; bytesPerPixel *= 2; break; case 6: size = width * 3 * height; bytesPerPixel *= 4; break; } if (size >= 0) image = new byte[size]; if (palShades) smask = new byte[width * height]; else if (genBWMask) smask = new byte[(width + 7) / 8 * height]; ByteArrayInputStream bai = new ByteArrayInputStream(idat.getBuf(), 0, idat.size()); InputStream infStream = new InflaterInputStream(bai, new Inflater()); this.dataStream = new DataInputStream(infStream); if (interlaceMethod != 1) { decodePass(0, 0, 1, 1, width, height); } else { decodePass(0, 0, 8, 8, (width + 7) / 8, (height + 7) / 8); decodePass(4, 0, 8, 8, (width + 3) / 8, (height + 7) / 8); decodePass(0, 4, 4, 8, (width + 3) / 4, (height + 3) / 8); decodePass(2, 0, 4, 4, (width + 1) / 4, (height + 3) / 4); decodePass(0, 2, 2, 4, (width + 1) / 2, (height + 1) / 4); decodePass(1, 0, 2, 2, width / 2, (height + 1) / 2); decodePass(0, 1, 1, 2, width, height / 2); } try { this.dataStream.close(); } catch (IOException e) { Logger logger = LoggerFactory.getLogger(this.getClass()); logger.warn("Datastream of PngImage#decodeIdat didn't close properly."); } } void decodePass(int xOffset, int yOffset, int xStep, int yStep, int passWidth, int passHeight) { if ((passWidth == 0) || (passHeight == 0)) { return; } int bytesPerRow = (inputBands * passWidth * 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 = dataStream.read(); dataStream.readFully(curr, 0, bytesPerRow); } catch (Exception e) { // empty on purpose } switch (filter) { case PNG_FILTER_NONE: break; case PNG_FILTER_SUB: decodeSubFilter(curr, bytesPerRow, bytesPerPixel); break; case PNG_FILTER_UP: decodeUpFilter(curr, prior, bytesPerRow); break; case PNG_FILTER_AVERAGE: decodeAverageFilter(curr, prior, bytesPerRow, bytesPerPixel); break; case PNG_FILTER_PAETH: decodePaethFilter(curr, prior, bytesPerRow, bytesPerPixel); break; default: // Error -- uknown filter type throw new RuntimeException(MessageLocalization.getComposedMessage("png.filter.unknown")); } processPixels(curr, xOffset, xStep, dstY, passWidth); // Swap curr and prior byte[] tmp = prior; prior = curr; curr = tmp; } } void processPixels(byte curr[], int xOffset, int step, int y, int width) { int srcX, dstX; int out[] = getPixel(curr); int sizes = 0; switch (colorType) { case 0: case 3: case 4: sizes = 1; break; case 2: case 6: sizes = 3; break; } if (image != null) { dstX = xOffset; int yStride = (sizes * this.width * (bitDepth == 16 ? 8 : bitDepth) + 7) / 8; for (srcX = 0; srcX < width; srcX++) { setPixel(image, out, inputBands * srcX, sizes, dstX, y, bitDepth, yStride); dstX += step; } } if (palShades) { if ((colorType & 4) != 0) { if (bitDepth == 16) { for (int k = 0; k < width; ++k) out[k * inputBands + sizes] >>>= 8; } int yStride = this.width; dstX = xOffset; for (srcX = 0; srcX < width; srcX++) { setPixel(smask, out, inputBands * srcX + sizes, 1, dstX, y, 8, yStride); dstX += step; } } else { //colorType 3 int yStride = this.width; int v[] = new int[1]; dstX = xOffset; for (srcX = 0; srcX < width; srcX++) { int idx = out[srcX]; if (idx < trans.length) v[0] = trans[idx]; else v[0] = 255; // Patrick Valsecchi setPixel(smask, v, 0, 1, dstX, y, 8, yStride); dstX += step; } } } else if (genBWMask) { switch (colorType) { case 3: { int yStride = (this.width + 7) / 8; int v[] = new int[1]; dstX = xOffset; for (srcX = 0; srcX < width; srcX++) { int idx = out[srcX]; v[0] = ((idx < trans.length && trans[idx] == 0) ? 1 : 0); setPixel(smask, v, 0, 1, dstX, y, 1, yStride); dstX += step; } break; } case 0: { int yStride = (this.width + 7) / 8; int v[] = new int[1]; dstX = xOffset; for (srcX = 0; srcX < width; srcX++) { int g = out[srcX]; v[0] = (g == transRedGray ? 1 : 0); setPixel(smask, v, 0, 1, dstX, y, 1, yStride); dstX += step; } break; } case 2: { int yStride = (this.width + 7) / 8; int v[] = new int[1]; dstX = xOffset; for (srcX = 0; srcX < width; srcX++) { int markRed = inputBands * srcX; v[0] = (out[markRed] == transRedGray && out[markRed + 1] == transGreen && out[markRed + 2] == transBlue ? 1 : 0); setPixel(smask, v, 0, 1, dstX, y, 1, yStride); dstX += step; } break; } } } } static int getPixel(byte image[], int x, int y, int bitDepth, int bytesPerRow) { if (bitDepth == 8) { int pos = bytesPerRow * y + x; return image[pos] & 0xff; } else { int pos = bytesPerRow * y + x / (8 / bitDepth); int v = image[pos] >> (8 - bitDepth * (x % (8 / bitDepth)) - bitDepth); return v & ((1 << bitDepth) - 1); } } static void setPixel(byte image[], int data[], int offset, int size, int x, int y, int bitDepth, int bytesPerRow) { if (bitDepth == 8) { int pos = bytesPerRow * y + size * x; for (int k = 0; k < size; ++k) image[pos + k] = (byte) data[k + offset]; } else if (bitDepth == 16) { int pos = bytesPerRow * y + size * x; for (int k = 0; k < size; ++k) image[pos + k] = (byte) (data[k + offset] >>> 8); } else { int pos = bytesPerRow * y + x / (8 / bitDepth); int v = data[offset] << (8 - bitDepth * (x % (8 / bitDepth)) - bitDepth); image[pos] |= v; } } int[] getPixel(byte curr[]) { switch (bitDepth) { case 8: { int out[] = new int[curr.length]; for (int k = 0; k < out.length; ++k) out[k] = curr[k] & 0xff; return out; } case 16: { 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: { int out[] = new int[curr.length * 8 / bitDepth]; int idx = 0; int passes = 8 / bitDepth; int mask = (1 << bitDepth) - 1; for (int k = 0; k < curr.length; ++k) { for (int j = passes - 1; j >= 0; --j) { out[idx++] = (curr[k] >>> (bitDepth * j)) & mask; } } return out; } } } private int getExpectedIccNumberOfComponents() { if (colorType == 0 || colorType == 4) { return 1; } else { return 3; } } private void checkIccProfile() { if (icc_profile != null && icc_profile.getNumComponents() != getExpectedIccNumberOfComponents()) { LoggerFactory.getLogger(getClass()) .warn(MessageLocalization.getComposedMessage("unexpected.color.space.in.embedded.icc.profile")); icc_profile = null; } } private static void decodeSubFilter(byte[] curr, int count, 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(byte[] curr, byte[] prev, int count) { for (int i = 0; i < count; i++) { int raw = curr[i] & 0xff; int prior = prev[i] & 0xff; curr[i] = (byte) (raw + prior); } } private static void decodeAverageFilter(byte[] curr, byte[] prev, int count, 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(int a, int b, int c) { int p = a + b - c; int pa = Math.abs(p - a); int pb = Math.abs(p - b); 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(byte[] curr, byte[] prev, int count, 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)); } } static class NewByteArrayOutputStream extends ByteArrayOutputStream { public byte[] getBuf() { return buf; } } /** * Gets an <CODE>int</CODE> from an <CODE>InputStream</CODE>. * * @param is an <CODE>InputStream</CODE> * @return the value of an <CODE>int</CODE> */ public static final int getInt(InputStream is) throws IOException { return (is.read() << 24) + (is.read() << 16) + (is.read() << 8) + is.read(); } /** * Gets a <CODE>word</CODE> from an <CODE>InputStream</CODE>. * * @param is an <CODE>InputStream</CODE> * @return the value of an <CODE>int</CODE> */ public static final int getWord(InputStream is) throws IOException { return (is.read() << 8) + is.read(); } /** * Gets a <CODE>String</CODE> from an <CODE>InputStream</CODE>. * * @param is an <CODE>InputStream</CODE> * @return the value of an <CODE>int</CODE> */ public static final String getString(InputStream is) throws IOException { StringBuffer buf = new StringBuffer(); for (int i = 0; i < 4; i++) { buf.append((char) is.read()); } return buf.toString(); } }