From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- .../classpath/gnu/javax/imageio/png/PNGFile.java | 257 +++++++++++++++++++++ 1 file changed, 257 insertions(+) create mode 100644 libjava/classpath/gnu/javax/imageio/png/PNGFile.java (limited to 'libjava/classpath/gnu/javax/imageio/png/PNGFile.java') diff --git a/libjava/classpath/gnu/javax/imageio/png/PNGFile.java b/libjava/classpath/gnu/javax/imageio/png/PNGFile.java new file mode 100644 index 000000000..76154cc66 --- /dev/null +++ b/libjava/classpath/gnu/javax/imageio/png/PNGFile.java @@ -0,0 +1,257 @@ +/* PNGFile.java -- High-level representation of a PNG file. + Copyright (C) 2006 Free Software Foundation + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.javax.imageio.png; + +import java.io.InputStream; +import java.io.OutputStream; +import java.io.IOException; +import java.util.Vector; +import java.awt.image.BufferedImage; +import java.awt.image.WritableRaster; +import java.awt.image.ColorModel; +import java.awt.color.ColorSpace; + +public class PNGFile +{ + /** + * The PNG file signature. + */ + private static final byte[] signature = new byte[] + { (byte)137, 80, 78, 71, 13, 10, 26, 10 }; + + /** + * The end chunk in raw form, no need for anything fancy here, it's just + * 0 bytes of length, the "IEND" tag and its CRC. + */ + private static final byte[] endChunk = new byte[] + { 0, 0, 0, 0, (byte)0x49, (byte)0x45, (byte)0x4E, (byte)0x44, + (byte)0xAE, (byte)0x42, (byte)0x60, (byte)0x82 }; + + /** + * The loaded data. + */ + private Vector chunks; + + /** + * The Header chunk + */ + private PNGHeader header; + + /** + * Whether this file has a palette chunk or not. + */ + private boolean hasPalette; + + /** + * Image width and height. + */ + private int width, height; + + /** + * The decoder, if any. + */ + private PNGDecoder decoder; + + /** + * The encoder, if any. (Either this or the above must exist). + */ + private PNGEncoder encoder; + + /** + * The source of this PNG (if encoding) + */ + private BufferedImage sourceImage; + + /** + * Creates a PNGFile object from an InputStream. + */ + public PNGFile(InputStream in) throws IOException, PNGException + { + PNGChunk chunk; + byte[] fileHdr = new byte[8]; + chunks = new Vector(); + hasPalette = false; + + if( in.read( fileHdr ) != 8 ) + throw new IOException("Could not read file header."); + if( !validateHeader( fileHdr ) ) + throw new PNGException("Invalid file header. Not a PNG file."); + + chunk = PNGChunk.readChunk( in, false ); + if( !(chunk instanceof PNGHeader) ) + throw new PNGException("First chunk not a header chunk."); + header = (PNGHeader)chunk; + if( !header.isValidChunk() ) + throw new PNGException("First chunk not a valid header."); + System.out.println(header); + + decoder = new PNGDecoder( header ); + // Read chunks. + do + { + chunk = PNGChunk.readChunk( in, false ); + /* + * We could exit here or output some kind of warning. + * But in the meantime, we'll just silently drop invalid chunks. + */ + if( chunk.isValidChunk() ) + { + if( chunk instanceof PNGData ) + decoder.addData( (PNGData)chunk ); + else // Silently ignore multiple headers, and use only the first. + if( chunk.getType() != PNGChunk.TYPE_END ) + { + chunks.add( chunk ); + hasPalette |= ( chunk instanceof PNGPalette ); + } + } + else + System.out.println("WARNING: Invalid chunk!"); + } + while( chunk.getType() != PNGChunk.TYPE_END ); + + if( header.isIndexed() && !hasPalette ) + throw new PNGException("File is indexed color and has no palette."); + + width = header.getWidth(); + height = header.getHeight(); + } + + /** + * Creates a PNG file from an existing BufferedImage. + */ + public PNGFile(BufferedImage bi) throws PNGException + { + sourceImage = bi; + width = bi.getWidth(); + height = bi.getHeight(); + chunks = new Vector(); + encoder = new PNGEncoder( bi ); + header = encoder.getHeader(); + if( header.isIndexed() ) + chunks.add( encoder.getPalette() ); + + // Do the compression and put the data chunks in the list. + chunks.addAll( encoder.encodeImage() ); + } + + /** + * Writes a PNG file to an OutputStream + */ + public void writePNG(OutputStream out) throws IOException + { + out.write( signature ); // write the signature. + header.writeChunk( out ); + for( int i = 0; i < chunks.size(); i++ ) + { + PNGChunk chunk = ((PNGChunk)chunks.elementAt(i)); + chunk.writeChunk( out ); + } + out.write( endChunk ); + } + + /** + * Check 8 bytes to see if it's a valid PNG header. + */ + private boolean validateHeader( byte[] hdr ) + { + if( hdr.length != 8 ) + return false; + for( int i = 0; i < 8; i++ ) + if( signature[i] != hdr[i] ) + return false; + return true; + } + + /** + * Return a loaded image as a bufferedimage. + */ + public BufferedImage getBufferedImage() + { + if( decoder == null ) + return sourceImage; + + WritableRaster r = decoder.getRaster( header ); + ColorModel cm; + if( header.isIndexed() ) + { + PNGPalette pngp = getPalette(); + cm = pngp.getPalette( getColorSpace() ); + } + else + cm = decoder.getColorModel( getColorSpace(), + header.getColorType(), + header.getDepth() ); + + return new BufferedImage(cm, r, false, null); + } + + /** + * Find the palette chunk and return it + */ + private PNGPalette getPalette() + { + for(int i = 0; i < chunks.size(); i++ ) + if( chunks.elementAt(i) instanceof PNGPalette ) + return ((PNGPalette)chunks.elementAt(i)); + return null; + } + + /** + * Return the Color space to use, first preference is ICC profile, then + * a gamma chunk, or returns null for the default sRGB. + */ + private ColorSpace getColorSpace() + { + PNGICCProfile icc = null; + PNGGamma gamma = null; + for(int i = 0; i < chunks.size(); i++ ) + { + if( chunks.elementAt(i) instanceof PNGICCProfile ) + icc = ((PNGICCProfile)chunks.elementAt(i)); + else if(chunks.elementAt(i) instanceof PNGGamma ) + gamma = ((PNGGamma)chunks.elementAt(i)); + } + + if( icc != null ) + return icc.getColorSpace(); +// if( gamma != null && !header.isGrayscale()) +// return gamma.getColorSpace( header.isGrayscale() ); + return null; + } +} -- cgit v1.2.3