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Diffstat (limited to 'libjava/classpath/gnu/java/awt/color/RgbProfileConverter.java')
| -rw-r--r-- | libjava/classpath/gnu/java/awt/color/RgbProfileConverter.java | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/color/RgbProfileConverter.java b/libjava/classpath/gnu/java/awt/color/RgbProfileConverter.java new file mode 100644 index 000000000..7623890a4 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/color/RgbProfileConverter.java @@ -0,0 +1,244 @@ +/* RgbProfileConverter.java -- RGB Profile conversion class + Copyright (C) 2004 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.java.awt.color; + +import java.awt.color.ICC_Profile; +import java.awt.color.ICC_ProfileRGB; +import java.awt.color.ProfileDataException; + +/** + * RgbProfileConverter - converts RGB profiles (ICC_ProfileRGB) + * + * This type of profile contains a matrix and three + * tone reproduction curves (TRCs). + * + * Device RGB --> CIE XYZ is done through first multiplying with + * a matrix, then each component is looked-up against it's TRC. + * + * The opposite transform is done using the inverse of the matrix, + * and TRC:s. + * + * @author Sven de Marothy + */ +public class RgbProfileConverter implements ColorSpaceConverter +{ + private float[][] matrix; + private float[][] inv_matrix; + private ToneReproductionCurve rTRC; + private ToneReproductionCurve gTRC; + private ToneReproductionCurve bTRC; + private ColorLookUpTable toPCS; + private ColorLookUpTable fromPCS; + + /** + * CIE 1931 D50 white point (in Lab coordinates) + */ + private static float[] D50 = { 0.96422f, 1.00f, 0.82521f }; + + /** + * Constructs an RgbProfileConverter from a given ICC_ProfileRGB + */ + public RgbProfileConverter(ICC_ProfileRGB profile) + { + toPCS = fromPCS = null; + matrix = profile.getMatrix(); + + // get TRCs + try + { + rTRC = new ToneReproductionCurve(profile.getGamma(ICC_ProfileRGB.REDCOMPONENT)); + } + catch (ProfileDataException e) + { + rTRC = new ToneReproductionCurve(profile.getTRC(ICC_ProfileRGB.REDCOMPONENT)); + } + try + { + gTRC = new ToneReproductionCurve(profile.getGamma(ICC_ProfileRGB.GREENCOMPONENT)); + } + catch (ProfileDataException e) + { + gTRC = new ToneReproductionCurve(profile.getTRC(ICC_ProfileRGB.GREENCOMPONENT)); + } + try + { + bTRC = new ToneReproductionCurve(profile.getGamma(ICC_ProfileRGB.BLUECOMPONENT)); + } + catch (ProfileDataException e) + { + bTRC = new ToneReproductionCurve(profile.getTRC(ICC_ProfileRGB.BLUECOMPONENT)); + } + + // If a CLUT is available, it should be used, and the TRCs ignored. + // Note: A valid profile may only have CLUTs in one direction, and + // TRC:s without useful info, making reverse-transforms impossible. + // In this case the TRC will be used for the reverse-transform with + // unpredictable results. This is in line with the Java specification, + try + { + toPCS = new ColorLookUpTable(profile, ICC_Profile.icSigAToB0Tag); + } + catch (Exception e) + { + toPCS = null; + } + + try + { + fromPCS = new ColorLookUpTable(profile, ICC_Profile.icSigBToA0Tag); + } + catch (Exception e) + { + fromPCS = null; + } + + // Calculate the inverse matrix if no reverse CLUT is available + if(fromPCS == null) + inv_matrix = invertMatrix(matrix); + else + { + // otherwise just set it to an identity matrix + inv_matrix = new float[3][3]; + inv_matrix[0][0] = inv_matrix[1][1] = inv_matrix[2][2] = 1.0f; + } + } + + public float[] toCIEXYZ(float[] in) + { + // CLUT takes precedence + if (toPCS != null) + return toPCS.lookup(in); + + float[] temp = new float[3]; + float[] out = new float[3]; + + // device space --> linear gamma + temp[0] = rTRC.lookup(in[0]); + temp[1] = gTRC.lookup(in[1]); + temp[2] = bTRC.lookup(in[2]); + + // matrix multiplication + out[0] = matrix[0][0] * temp[0] + matrix[0][1] * temp[1] + + matrix[0][2] * temp[2]; + out[1] = matrix[1][0] * temp[0] + matrix[1][1] * temp[1] + + matrix[1][2] * temp[2]; + out[2] = matrix[2][0] * temp[0] + matrix[2][1] * temp[1] + + matrix[2][2] * temp[2]; + + return out; + } + + public float[] toRGB(float[] in) + { + return SrgbConverter.XYZtoRGB(toCIEXYZ(in)); + } + + public float[] fromCIEXYZ(float[] in) + { + if (fromPCS != null) + return fromPCS.lookup(in); + + float[] temp = new float[3]; + float[] out = new float[3]; + + // matrix multiplication + temp[0] = inv_matrix[0][0] * in[0] + inv_matrix[0][1] * in[1] + + inv_matrix[0][2] * in[2]; + temp[1] = inv_matrix[1][0] * in[0] + inv_matrix[1][1] * in[1] + + inv_matrix[1][2] * in[2]; + temp[2] = inv_matrix[2][0] * in[0] + inv_matrix[2][1] * in[1] + + inv_matrix[2][2] * in[2]; + + // device space --> linear gamma + out[0] = rTRC.reverseLookup(temp[0]); + out[1] = gTRC.reverseLookup(temp[1]); + out[2] = bTRC.reverseLookup(temp[2]); + + // FIXME: Sun appears to clip the return values to [0,1] + // I don't believe that is a Good Thing, + // (some colorspaces may allow values outside that range.) + // So we return the actual values here. + return out; + } + + public float[] fromRGB(float[] in) + { + return fromCIEXYZ(SrgbConverter.RGBtoXYZ(in)); + } + + /** + * Inverts a 3x3 matrix, returns the inverse, + * throws an IllegalArgumentException if the matrix is not + * invertible (this shouldn't happen for a valid profile) + */ + private float[][] invertMatrix(float[][] matrix) + { + float[][] out = new float[3][3]; + double determinant = matrix[0][0] * (matrix[1][1] * matrix[2][2] + - matrix[2][1] * matrix[1][2]) + - matrix[0][1] * (matrix[1][0] * matrix[2][2] + - matrix[2][0] * matrix[1][2]) + + matrix[0][2] * (matrix[1][0] * matrix[2][1] + - matrix[2][0] * matrix[1][1]); + + if (determinant == 0.0) + throw new IllegalArgumentException("Can't invert conversion matrix."); + float invdet = (float) (1.0 / determinant); + + out[0][0] = invdet * (matrix[1][1] * matrix[2][2] + - matrix[1][2] * matrix[2][1]); + out[0][1] = invdet * (matrix[0][2] * matrix[2][1] + - matrix[0][1] * matrix[2][2]); + out[0][2] = invdet * (matrix[0][1] * matrix[1][2] + - matrix[0][2] * matrix[1][1]); + out[1][0] = invdet * (matrix[1][2] * matrix[2][0] + - matrix[1][0] * matrix[2][2]); + out[1][1] = invdet * (matrix[0][0] * matrix[2][2] + - matrix[0][2] * matrix[2][0]); + out[1][2] = invdet * (matrix[0][2] * matrix[1][0] + - matrix[0][0] * matrix[1][2]); + out[2][0] = invdet * (matrix[1][0] * matrix[2][1] + - matrix[1][1] * matrix[2][0]); + out[2][1] = invdet * (matrix[0][1] * matrix[2][0] + - matrix[0][0] * matrix[2][1]); + out[2][2] = invdet * (matrix[0][0] * matrix[1][1] + - matrix[0][1] * matrix[1][0]); + return out; + } +} |