| /* PNGGamma.java -- GAMA chunk. |
| 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.awt.color.ICC_ProfileGray; |
| import java.awt.color.ICC_ProfileRGB; |
| import java.awt.color.ICC_Profile; |
| import java.awt.color.ICC_ColorSpace; |
| import java.awt.color.ColorSpace; |
| |
| /** |
| * A PNG gAMA (gamma) chunk. |
| */ |
| public class PNGGamma extends PNGChunk |
| { |
| private double gamma; |
| |
| protected PNGGamma( int type, byte[] data, int crc ) throws PNGException |
| { |
| super( type, data, crc ); |
| if( data.length < 4 ) |
| throw new PNGException("Unexpectedly short time chunk. ("+data.length+" bytes)"); |
| long g = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) | |
| ((data[2] & 0xFF) << 8) | (data[3] & 0xFF); |
| gamma = (double)g; |
| gamma = 100000.0/gamma; |
| } |
| |
| public PNGGamma( double g ) |
| { |
| super( TYPE_GAMMA ); |
| data = new byte[ 4 ]; |
| gamma = g; |
| long tmp = (long)(100000.0/gamma); |
| data[0] = (byte)((tmp & 0xFF000000) >> 24); |
| data[1] = (byte)((tmp & 0xFF0000) >> 16); |
| data[2] = (byte)((tmp & 0xFF00) >> 8); |
| data[3] = (byte)(tmp & 0xFF); |
| } |
| |
| /** |
| * Returns a ColorSpace object corresponding to this gamma value. |
| */ |
| public ColorSpace getColorSpace(boolean grayscale) |
| { |
| // FIXME. |
| return null; |
| } |
| |
| public String toString() |
| { |
| return "PNG Gamma chunk, value: "+gamma; |
| } |
| } |