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jlechner |
/* ICC_ProfileRGB.java -- the ICC profile for a RGB colorspace
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Copyright (C) 2002, 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.color;
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/**
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* ICC_ProfileRGB - a special case of ICC_Profiles.
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*
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* The ICC_Profile.getInstance() method will return an instance of the
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* ICC_ProfileRGB subclass when all the following conditions are met:
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* The device color space of the profile is TYPE_RGB.
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* The profile contains red, green and blue ColorantTags.
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* The profile contains red, green and blue TRCTags.
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* The profile contains a mediaWhitePointTag included.
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*
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* As per the ICC specification, the color space conversion can then
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* be done through the following method:
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* linearR = redTRC[deviceR]
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* linearG = greenTRC[deviceG]
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* linearB = blueTRC[deviceB]
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* TRC curves are either a single gamma value, or a 1-dimensional lookup table.
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*
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* Followed by the matrix transform:
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* PCS = M*linear
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*
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* Where PCS is the vector of profile color space (must be XYZ) coordinates,
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* linear is the vector of linear RGB coordinates, and the matrix M is
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* constructed from the ColorantTags, where the columns are red, green and
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* blue respectively, and the rows are X, Y and Z.
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*
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* Note that if the profile contains a CLUT for the color space conversion,
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* it should be used instead, and the TRC information ignored.
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*
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* @author Sven de Marothy
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* @since 1.2
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*/
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public class ICC_ProfileRGB extends ICC_Profile
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{
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/**
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* Compatible with JDK 1.2+.
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*/
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private static final long serialVersionUID = 8505067385152579334L;
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public static final int REDCOMPONENT = 0;
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public static final int GREENCOMPONENT = 1;
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public static final int BLUECOMPONENT = 2;
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private transient float[][] matrix;
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private transient float[] gamma;
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private transient float[] whitePoint;
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/**
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* Package-private constructor used by ICC_ColorSpace for creating an
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* ICC_ProfileRGB from a predefined ColorSpace (CS_LINEAR_RGB and CS_sRGB)
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*/
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ICC_ProfileRGB(int cspace)
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{
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super(cspace);
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matrix = createMatrix();
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whitePoint = getXYZData(icSigMediaWhitePointTag);
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}
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/**
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* Package-private constructor used by ICC_ColorSpace for creating an
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* ICC_ProfileRGB from profile data.
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*/
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ICC_ProfileRGB(byte[] data)
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{
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super(data);
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matrix = createMatrix();
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whitePoint = getXYZData(icSigMediaWhitePointTag);
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}
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/**
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* Returns the media white point of the profile.
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*/
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public float[] getMediaWhitePoint()
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{
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float[] wp = new float[3];
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wp[0] = whitePoint[0];
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wp[1] = whitePoint[1];
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wp[2] = whitePoint[2];
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return wp;
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}
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/**
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* Returns the colorant matrix of the conversion.
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*/
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public float[][] getMatrix()
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{
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float[][] mat = new float[3][3];
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for (int i = 0; i < 3; i++)
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for (int j = 0; j < 3; j++)
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mat[i][j] = matrix[i][j];
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return mat;
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}
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/**
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* Returns the gamma value of a component
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* @throws ProfileDataException if the TRC is described by a lookup
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* table and not a gamma value.
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*/
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public float getGamma(int component)
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{
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short[] data;
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switch (component)
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{
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case REDCOMPONENT:
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data = getCurve(icSigRedTRCTag);
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break;
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case GREENCOMPONENT:
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data = getCurve(icSigGreenTRCTag);
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break;
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case BLUECOMPONENT:
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data = getCurve(icSigBlueTRCTag);
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break;
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default:
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throw new IllegalArgumentException("Not a valid component");
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}
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if (data == null)
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throw new IllegalArgumentException("Error reading TRC");
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if (data.length != 1)
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throw new ProfileDataException("Not a single-gamma TRC");
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// convert the unsigned 7.8 fixed-point gamma to a float.
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float gamma = (float) (((int) data[0] & 0xFF00) >> 8);
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double fraction = ((int) data[0] & 0x00FF) / 256.0;
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gamma += (float) fraction;
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return gamma;
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}
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/**
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* Returns the TRC lookup table for a component
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* @throws ProfileDataException if the TRC is described by a gamma
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* value and not a lookup table.
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*/
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public short[] getTRC(int component)
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{
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short[] data;
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switch (component)
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{
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case REDCOMPONENT:
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data = getCurve(icSigRedTRCTag);
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break;
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case GREENCOMPONENT:
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data = getCurve(icSigGreenTRCTag);
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break;
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case BLUECOMPONENT:
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data = getCurve(icSigBlueTRCTag);
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break;
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default:
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throw new IllegalArgumentException("Not a valid component");
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}
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if (data == null)
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throw new IllegalArgumentException("Error reading TRC");
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if (data.length <= 1)
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throw new ProfileDataException("Gamma value, not a TRC table.");
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return data;
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}
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/**
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* Creates the colorspace conversion matrix from the RGB tristimulus
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* values.
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*/
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private float[][] createMatrix() throws IllegalArgumentException
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{
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float[][] mat = new float[3][3];
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float[] r;
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float[] g;
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float[] b;
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r = getXYZData(icSigRedColorantTag);
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g = getXYZData(icSigGreenColorantTag);
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b = getXYZData(icSigBlueColorantTag);
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if (r == null || g == null || b == null)
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throw new IllegalArgumentException("Error reading colorant tags!");
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for (int i = 0; i < 3; i++)
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{
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mat[i][0] = r[i];
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mat[i][1] = g[i];
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mat[i][2] = b[i];
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}
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return mat;
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}
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} // class ICC_ProfileRGB
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