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1: /* PNGGamma.java -- GAMA chunk. 2: Copyright (C) 2006 Free Software Foundation 3: 4: This file is part of GNU Classpath. 5: 6: GNU Classpath is free software; you can redistribute it and/or modify 7: it under the terms of the GNU General Public License as published by 8: the Free Software Foundation; either version 2, or (at your option) 9: any later version. 10: 11: GNU Classpath is distributed in the hope that it will be useful, but 12: WITHOUT ANY WARRANTY; without even the implied warranty of 13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14: General Public License for more details. 15: 16: You should have received a copy of the GNU General Public License 17: along with GNU Classpath; see the file COPYING. If not, write to the 18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19: 02110-1301 USA. 20: 21: Linking this library statically or dynamically with other modules is 22: making a combined work based on this library. Thus, the terms and 23: conditions of the GNU General Public License cover the whole 24: combination. 25: 26: As a special exception, the copyright holders of this library give you 27: permission to link this library with independent modules to produce an 28: executable, regardless of the license terms of these independent 29: modules, and to copy and distribute the resulting executable under 30: terms of your choice, provided that you also meet, for each linked 31: independent module, the terms and conditions of the license of that 32: module. An independent module is a module which is not derived from 33: or based on this library. If you modify this library, you may extend 34: this exception to your version of the library, but you are not 35: obligated to do so. If you do not wish to do so, delete this 36: exception statement from your version. */ 37: 38: package gnu.javax.imageio.png; 39: 40: import java.awt.color.ICC_ProfileGray; 41: import java.awt.color.ICC_ProfileRGB; 42: import java.awt.color.ICC_Profile; 43: import java.awt.color.ICC_ColorSpace; 44: import java.awt.color.ColorSpace; 45: 46: /** 47: * A PNG gAMA (gamma) chunk. 48: */ 49: public class PNGGamma extends PNGChunk 50: { 51: private double gamma; 52: 53: protected PNGGamma( int type, byte[] data, int crc ) throws PNGException 54: { 55: super( type, data, crc ); 56: if( data.length < 4 ) 57: throw new PNGException("Unexpectedly short time chunk. ("+data.length+" bytes)"); 58: long g = ((data[0] & 0xFF) << 24) | ( (data[1] & 0xFF) << 16 ) | 59: ((data[2] & 0xFF) << 8) | (data[3] & 0xFF); 60: gamma = (double)g; 61: gamma = 100000.0/gamma; 62: } 63: 64: public PNGGamma( double g ) 65: { 66: super( TYPE_GAMMA ); 67: data = new byte[ 4 ]; 68: gamma = g; 69: long tmp = (long)(100000.0/gamma); 70: data[0] = (byte)((tmp & 0xFF000000) >> 24); 71: data[1] = (byte)((tmp & 0xFF0000) >> 16); 72: data[2] = (byte)((tmp & 0xFF00) >> 8); 73: data[3] = (byte)(tmp & 0xFF); 74: } 75: 76: /** 77: * Returns a ColorSpace object corresponding to this gamma value. 78: */ 79: public ColorSpace getColorSpace(boolean grayscale) 80: { 81: // FIXME. 82: return null; 83: } 84: 85: public String toString() 86: { 87: return "PNG Gamma chunk, value: "+gamma; 88: } 89: }