| /* ICC_ProfileGray.java -- the ICC profile for a Gray colorspace |
| Copyright (C) 2002, 2004 Free Software Foundation, Inc. |
| |
| 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 java.awt.color; |
| |
| /** |
| * ICC_ProfileGray - a special case of ICC_Profiles. |
| * |
| * The ICC_Profile.getInstance() method will return an instance of the |
| * ICC_ProfileGray subclass when all the following conditions are met: |
| * The device color space of the profile is TYPE_GRAY. |
| * The profile contains a gray TRCTag. |
| * The profile contains a mediaWhitePointTag. |
| * |
| * As per the ICC specification, the color space conversion can then |
| * be done through the following method: |
| * linearGray = grayTRC[deviceGray] |
| * |
| * Note that if the profile contains a CLUT for the color space conversion, |
| * it should be used instead, and the TRC information ignored. |
| * |
| * @author Sven de Marothy |
| * @since 1.2 |
| */ |
| public class ICC_ProfileGray extends ICC_Profile |
| { |
| /** |
| * Compatible with JDK 1.2+. |
| */ |
| private static final long serialVersionUID = -1124721290732002649L; |
| private transient float[] whitePoint; |
| |
| /** |
| * Package-private constructor used by ICC_ColorSpace for creating an |
| * ICC_ProfileGray from a predefined ColorSpace (CS_GRAY) |
| */ |
| ICC_ProfileGray(int cspace) |
| { |
| super(cspace); |
| whitePoint = getXYZData(icSigMediaWhitePointTag); |
| } |
| |
| /** |
| * Package-private constructor used by ICC_ColorSpace for creating an |
| * ICC_ProfileGray from profile data. |
| */ |
| ICC_ProfileGray(byte[] data) |
| { |
| super(data); |
| whitePoint = getXYZData(icSigMediaWhitePointTag); |
| } |
| |
| |
| /** |
| * Returns the media white point of the profile. |
| */ |
| public float[] getMediaWhitePoint() |
| { |
| float[] wp = new float[3]; |
| wp[0] = whitePoint[0]; |
| wp[1] = whitePoint[1]; |
| wp[2] = whitePoint[2]; |
| return wp; |
| } |
| |
| /** |
| * Returns the TRC gamma value. |
| * @throws ProfileDataException if the TRC is described by a lookup |
| * table and not a gamma value. |
| */ |
| public float getGamma() |
| { |
| short[] data = getCurve(icSigGrayTRCTag); |
| if (data == null) |
| throw new IllegalArgumentException("Couldn't read Gray TRC data."); |
| if (data.length != 1) |
| throw new ProfileDataException("TRC is a table, not a gamma value."); |
| |
| // convert the unsigned 7.8 fixed-point gamma to a float. |
| double gamma = (double) (data[0] & (0xFFFF)) / 256.0; |
| return (float) gamma; |
| } |
| |
| /** |
| * Returns the TRC lookup table. |
| * @throws ProfileDataException if the TRC is described by a gamma value |
| * and not a lookup table. |
| */ |
| public short[] getTRC() |
| { |
| short[] data = getCurve(icSigGrayTRCTag); |
| if (data == null) |
| throw new IllegalArgumentException("Couldn't read Gray TRC data."); |
| if (data.length <= 1) |
| throw new ProfileDataException("Gamma value, not a TRC table."); |
| return data; |
| } |
| } // class ICC_ProfileGray |