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jeremybenn |
/* YCbCr_ColorSpace.java --
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Copyright (C) 2005 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 gnu.javax.imageio.jpeg;
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import java.awt.color.ColorSpace;
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public class YCbCr_ColorSpace extends ColorSpace {
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public YCbCr_ColorSpace() {
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super(ColorSpace.TYPE_YCbCr, 3);
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}
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public float[] fromCIEXYZ(float[] data) {
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return(new float[data.length]);
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}
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public float[] toCIEXYZ(float[] data) {
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return(new float[data.length]);
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}
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public float[] fromRGB(float[] data) {
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return(new float[data.length]);
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}
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/* YCbCr to RGB range 0 to 1 */
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public float[] toRGB(float[] data) {
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float[] dest = new float[3];
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data[0] *= 255;
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data[1] *= 255;
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data[2] *= 255;
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dest[0] = (float)data[0] + (float)1.402*((float)data[2]-(float)128);
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dest[1] = (float)data[0] - (float)0.34414*((float)data[1]-(float)128) - (float)0.71414*((float)data[2]-(float)128);
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dest[2] = (float)data[0] + (float)1.772*((float)data[1]-(float)128);
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dest[0] /= 255;
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dest[1] /= 255;
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dest[2] /= 255;
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//dest[0] = ((float)1.164*((float)data[0]*(float)255 - (float)16) + (float)1.596*((float)data[2]*(float)255 - (float)128))/(float)255;
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//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;
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//dest[2] = ((float)1.164*((float)data[0]*(float)255 - (float)16) + (float)2.017*((float)data[1]*(float)255 - (float)128))/(float)255;
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//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]);
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if(dest[0] < (float)0)
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dest[0] = 0;
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if(dest[1] < (float)0)
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dest[1] = 0;
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if(dest[2] < (float)0)
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dest[2] = 0;
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if(dest[0] > (float)1)
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dest[0] = 1;
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if(dest[1] > (float)1)
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dest[1] = 1;
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if(dest[2] > (float)1)
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dest[2] = 1;
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return(dest);
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}
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/* RGB to YCbCr range 0-255 */
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public static float[] toYCbCr(float[] data) {
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float[] dest = new float[3];
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//dest[0] = (float)0.257*data[0] + (float)0.504*data[1] + (float)0.098*data[2] + 16;
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//dest[1] = (float)-0.148*data[0] - (float)0.291*data[1] + (float)0.439*data[2] + 128;
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//dest[2] = (float)0.439*data[0] - (float)0.368*data[1] - (float)0.071*data[2] + 128;
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dest[0] = (float)((0.299 * (float)data[0] + 0.587 * (float)data[1] + 0.114 * (float)data[2]));
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dest[1] = 128 + (float)((-0.16874 * (float)data[0] - 0.33126 * (float)data[1] + 0.5 * (float)data[2]));
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dest[2] = 128 + (float)((0.5 * (float)data[0] - 0.41869 * (float)data[1] - 0.08131 * (float)data[2]));
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return(dest);
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}
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}
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