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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java')
-rw-r--r-- | libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java b/libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java new file mode 100644 index 000000000..3f95b07d7 --- /dev/null +++ b/libjava/classpath/gnu/java/awt/color/GrayProfileConverter.java @@ -0,0 +1,137 @@ +/* GrayProfileConverter.java -- Gray 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_ProfileGray; +import java.awt.color.ProfileDataException; + +/** + * GrayProfileConverter - converts Grayscale profiles (ICC_ProfileGray) + * + * This type of profile contains a single tone reproduction curve (TRC). + * Conversion consists of simple TRC lookup. + * + * This implementation is very lazy and does everything applying the TRC and + * utilizing the built-in linear grayscale color space. + * + * @author Sven de Marothy + */ +public class GrayProfileConverter implements ColorSpaceConverter +{ + private GrayScaleConverter gc; + private ToneReproductionCurve trc; + private ColorLookUpTable toPCS; + private ColorLookUpTable fromPCS; + + /** + * Constructs the converter described by an ICC_ProfileGray object + */ + public GrayProfileConverter(ICC_ProfileGray profile) + { + try + { + trc = new ToneReproductionCurve(profile.getGamma()); + } + catch (ProfileDataException e) + { + trc = new ToneReproductionCurve(profile.getTRC()); + } + + // linear grayscale converter + gc = new GrayScaleConverter(); + + // 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; + } + } + + public float[] toCIEXYZ(float[] in) + { + if (toPCS != null) + return toPCS.lookup(in); + float[] gray = new float[1]; + gray[0] = trc.lookup(in[0]); + return gc.toCIEXYZ(gray); + } + + public float[] toRGB(float[] in) + { + float[] gray = new float[1]; + gray[0] = trc.lookup(in[0]); + return gc.toRGB(gray); + } + + public float[] fromRGB(float[] in) + { + // get linear grayscale value + float[] gray = gc.fromRGB(in); + gray[0] = trc.reverseLookup(gray[0]); + return gray; + } + + public float[] fromCIEXYZ(float[] in) + { + if (fromPCS != null) + return fromPCS.lookup(in); + + float[] gray = gc.fromCIEXYZ(in); + gray[0] = trc.reverseLookup(gray[0]); + return gray; + } +} |