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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/color/ICC_ProfileRGB.java
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+/* ICC_ProfileRGB.java -- the ICC profile for a RGB 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_ProfileRGB - a special case of ICC_Profiles.
+ *
+ * The ICC_Profile.getInstance() method will return an instance of the
+ * ICC_ProfileRGB subclass when all the following conditions are met:
+ * The device color space of the profile is TYPE_RGB.
+ * The profile contains red, green and blue ColorantTags.
+ * The profile contains red, green and blue TRCTags.
+ * The profile contains a mediaWhitePointTag included.
+ *
+ * As per the ICC specification, the color space conversion can then
+ * be done through the following method:
+ * linearR = redTRC[deviceR]
+ * linearG = greenTRC[deviceG]
+ * linearB = blueTRC[deviceB]
+ * TRC curves are either a single gamma value, or a 1-dimensional lookup table.
+ *
+ * Followed by the matrix transform:
+ * PCS = M*linear
+ *
+ * Where PCS is the vector of profile color space (must be XYZ) coordinates,
+ * linear is the vector of linear RGB coordinates, and the matrix M is
+ * constructed from the ColorantTags, where the columns are red, green and
+ * blue respectively, and the rows are X, Y and Z.
+ *
+ * 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_ProfileRGB extends ICC_Profile
+{
+ /**
+ * Compatible with JDK 1.2+.
+ */
+ private static final long serialVersionUID = 8505067385152579334L;
+
+ public static final int REDCOMPONENT = 0;
+
+ public static final int GREENCOMPONENT = 1;
+
+ public static final int BLUECOMPONENT = 2;
+
+ private transient float[][] matrix;
+
+ private transient float[] gamma;
+
+ private transient float[] whitePoint;
+
+
+ /**
+ * Package-private constructor used by ICC_ColorSpace for creating an
+ * ICC_ProfileRGB from a predefined ColorSpace (CS_LINEAR_RGB and CS_sRGB)
+ */
+ ICC_ProfileRGB(int cspace)
+ {
+ super(cspace);
+ matrix = createMatrix();
+ whitePoint = getXYZData(icSigMediaWhitePointTag);
+ }
+
+ /**
+ * Package-private constructor used by ICC_ColorSpace for creating an
+ * ICC_ProfileRGB from profile data.
+ */
+ ICC_ProfileRGB(byte[] data)
+ {
+ super(data);
+ matrix = createMatrix();
+ 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 colorant matrix of the conversion.
+ */
+ public float[][] getMatrix()
+ {
+ float[][] mat = new float[3][3];
+ for (int i = 0; i < 3; i++)
+ for (int j = 0; j < 3; j++)
+ mat[i][j] = matrix[i][j];
+ return mat;
+ }
+
+ /**
+ * Returns the gamma value of a component
+ * @throws ProfileDataException if the TRC is described by a lookup
+ * table and not a gamma value.
+ */
+ public float getGamma(int component)
+ {
+ short[] data;
+ switch (component)
+ {
+ case REDCOMPONENT:
+ data = getCurve(icSigRedTRCTag);
+ break;
+ case GREENCOMPONENT:
+ data = getCurve(icSigGreenTRCTag);
+ break;
+ case BLUECOMPONENT:
+ data = getCurve(icSigBlueTRCTag);
+ break;
+ default:
+ throw new IllegalArgumentException("Not a valid component");
+ }
+ if (data == null)
+ throw new IllegalArgumentException("Error reading TRC");
+
+ if (data.length != 1)
+ throw new ProfileDataException("Not a single-gamma TRC");
+
+ // convert the unsigned 7.8 fixed-point gamma to a float.
+ float gamma = (float) (((int) data[0] & 0xFF00) >> 8);
+ double fraction = ((int) data[0] & 0x00FF) / 256.0;
+ gamma += (float) fraction;
+ return gamma;
+ }
+
+ /**
+ * Returns the TRC lookup table for a component
+ * @throws ProfileDataException if the TRC is described by a gamma
+ * value and not a lookup table.
+ */
+ public short[] getTRC(int component)
+ {
+ short[] data;
+ switch (component)
+ {
+ case REDCOMPONENT:
+ data = getCurve(icSigRedTRCTag);
+ break;
+ case GREENCOMPONENT:
+ data = getCurve(icSigGreenTRCTag);
+ break;
+ case BLUECOMPONENT:
+ data = getCurve(icSigBlueTRCTag);
+ break;
+ default:
+ throw new IllegalArgumentException("Not a valid component");
+ }
+ if (data == null)
+ throw new IllegalArgumentException("Error reading TRC");
+
+ if (data.length <= 1)
+ throw new ProfileDataException("Gamma value, not a TRC table.");
+
+ return data;
+ }
+
+ /**
+ * Creates the colorspace conversion matrix from the RGB tristimulus
+ * values.
+ */
+ private float[][] createMatrix() throws IllegalArgumentException
+ {
+ float[][] mat = new float[3][3];
+ float[] r;
+ float[] g;
+ float[] b;
+ r = getXYZData(icSigRedColorantTag);
+ g = getXYZData(icSigGreenColorantTag);
+ b = getXYZData(icSigBlueColorantTag);
+ if (r == null || g == null || b == null)
+ throw new IllegalArgumentException("Error reading colorant tags!");
+ for (int i = 0; i < 3; i++)
+ {
+ mat[i][0] = r[i];
+ mat[i][1] = g[i];
+ mat[i][2] = b[i];
+ }
+ return mat;
+ }
+} // class ICC_ProfileRGB