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Diffstat (limited to 'gnu/javax/imageio/jpeg/YCbCr_ColorSpace.java')
-rw-r--r-- | gnu/javax/imageio/jpeg/YCbCr_ColorSpace.java | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gnu/javax/imageio/jpeg/YCbCr_ColorSpace.java b/gnu/javax/imageio/jpeg/YCbCr_ColorSpace.java new file mode 100644 index 000000000..a3970b7fa --- /dev/null +++ b/gnu/javax/imageio/jpeg/YCbCr_ColorSpace.java @@ -0,0 +1,113 @@ +/* YCbCr_ColorSpace.java -- + Copyright (C) 2005 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 gnu.javax.imageio.jpeg; + +import java.awt.color.ColorSpace; + +public class YCbCr_ColorSpace extends ColorSpace { + public YCbCr_ColorSpace() { + super(ColorSpace.TYPE_YCbCr, 3); + } + + public float[] fromCIEXYZ(float[] data) { + return(new float[data.length]); + } + + public float[] toCIEXYZ(float[] data) { + return(new float[data.length]); + } + + public float[] fromRGB(float[] data) { + return(new float[data.length]); + } + + /* YCbCr to RGB range 0 to 1 */ + public float[] toRGB(float[] data) { + float[] dest = new float[3]; + + data[0] *= 255; + data[1] *= 255; + data[2] *= 255; + + dest[0] = (float)data[0] + (float)1.402*((float)data[2]-(float)128); + dest[1] = (float)data[0] - (float)0.34414*((float)data[1]-(float)128) - (float)0.71414*((float)data[2]-(float)128); + dest[2] = (float)data[0] + (float)1.772*((float)data[1]-(float)128); + + dest[0] /= 255; + dest[1] /= 255; + dest[2] /= 255; + + //dest[0] = ((float)1.164*((float)data[0]*(float)255 - (float)16) + (float)1.596*((float)data[2]*(float)255 - (float)128))/(float)255; + //dest[1] = ((float)1.164*((float)data[0]*(float)255 - (float)16) - (float)0.813*((float)data[2]*(float)255 - (float)128) - (float)0.392*(data[1]*255 - 128))/(float)255; + //dest[2] = ((float)1.164*((float)data[0]*(float)255 - (float)16) + (float)2.017*((float)data[1]*(float)255 - (float)128))/(float)255; + + //System.err.println("toRGB values received: 0: "+data[0]+" 1: "+data[1]+" 2: "+data[2]+" sent: 0: "+dest[0]+" 1: "+dest[1]+" 2: "+dest[2]); + if(dest[0] < (float)0) + dest[0] = 0; + if(dest[1] < (float)0) + dest[1] = 0; + if(dest[2] < (float)0) + dest[2] = 0; + + if(dest[0] > (float)1) + dest[0] = 1; + if(dest[1] > (float)1) + dest[1] = 1; + if(dest[2] > (float)1) + dest[2] = 1; + + + return(dest); + } + + /* RGB to YCbCr range 0-255 */ + public static float[] toYCbCr(float[] data) { + float[] dest = new float[3]; + //dest[0] = (float)0.257*data[0] + (float)0.504*data[1] + (float)0.098*data[2] + 16; + //dest[1] = (float)-0.148*data[0] - (float)0.291*data[1] + (float)0.439*data[2] + 128; + //dest[2] = (float)0.439*data[0] - (float)0.368*data[1] - (float)0.071*data[2] + 128; + + dest[0] = (float)((0.299 * (float)data[0] + 0.587 * (float)data[1] + 0.114 * (float)data[2])); + dest[1] = 128 + (float)((-0.16874 * (float)data[0] - 0.33126 * (float)data[1] + 0.5 * (float)data[2])); + dest[2] = 128 + (float)((0.5 * (float)data[0] - 0.41869 * (float)data[1] - 0.08131 * (float)data[2])); + + + return(dest); + + } +} |