cmsdk: Factoring out color temperature to RGB conversion algorithm
* We need this for other things besides LiveDisplay. Change-Id: I14c80b059beded80c7cee369a9b40f71d6e905e8
This commit is contained in:
Steve Kondik
parent
e3c966861f
commit
6f3c30a9ce
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2011-2015 CyanogenMod Project
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* Copyright (c) 2011-2016 The CyanogenMod Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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@ -19,6 +19,7 @@ import android.graphics.Bitmap;
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import android.graphics.Color;
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import android.graphics.drawable.BitmapDrawable;
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import android.graphics.drawable.Drawable;
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import android.util.MathUtils;
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import com.android.internal.util.cm.palette.Palette;
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@ -301,4 +302,225 @@ public class ColorUtils {
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return alertColor;
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}
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/**
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* Convert a color temperature value (in Kelvin) to a RGB units as floats.
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* This can be used in a transform matrix or hardware gamma control.
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*
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* @param tempK
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* @return
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*/
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public static float[] temperatureToRGB(int degreesK) {
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int k = MathUtils.constrain(degreesK, 1000, 20000);
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float a = (k % 100) / 100.0f;
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int i = ((k - 1000)/ 100) * 3;
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return new float[] { interp(i, a), interp(i+1, a), interp(i+2, a) };
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}
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private static float interp(int i, float a) {
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return MathUtils.lerp((float)sColorTable[i], (float)sColorTable[i+3], a);
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}
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/**
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* This table is a modified version of the original blackbody chart, found here:
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* http://www.vendian.org/mncharity/dir3/blackbody/UnstableURLs/bbr_color.html
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*
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* Created by Ingo Thiel.
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*/
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private static final double[] sColorTable = new double[] {
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1.00000000, 0.18172716, 0.00000000,
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1.00000000, 0.25503671, 0.00000000,
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1.00000000, 0.30942099, 0.00000000,
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1.00000000, 0.35357379, 0.00000000,
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1.00000000, 0.39091524, 0.00000000,
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1.00000000, 0.42322816, 0.00000000,
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1.00000000, 0.45159884, 0.00000000,
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1.00000000, 0.47675916, 0.00000000,
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1.00000000, 0.49923747, 0.00000000,
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1.00000000, 0.51943421, 0.00000000,
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1.00000000, 0.54360078, 0.08679949,
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1.00000000, 0.56618736, 0.14065513,
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1.00000000, 0.58734976, 0.18362641,
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1.00000000, 0.60724493, 0.22137978,
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1.00000000, 0.62600248, 0.25591950,
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1.00000000, 0.64373109, 0.28819679,
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1.00000000, 0.66052319, 0.31873863,
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1.00000000, 0.67645822, 0.34786758,
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1.00000000, 0.69160518, 0.37579588,
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1.00000000, 0.70602449, 0.40267128,
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1.00000000, 0.71976951, 0.42860152,
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1.00000000, 0.73288760, 0.45366838,
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1.00000000, 0.74542112, 0.47793608,
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1.00000000, 0.75740814, 0.50145662,
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1.00000000, 0.76888303, 0.52427322,
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1.00000000, 0.77987699, 0.54642268,
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1.00000000, 0.79041843, 0.56793692,
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1.00000000, 0.80053332, 0.58884417,
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1.00000000, 0.81024551, 0.60916971,
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1.00000000, 0.81957693, 0.62893653,
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1.00000000, 0.82854786, 0.64816570,
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1.00000000, 0.83717703, 0.66687674,
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1.00000000, 0.84548188, 0.68508786,
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1.00000000, 0.85347859, 0.70281616,
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1.00000000, 0.86118227, 0.72007777,
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1.00000000, 0.86860704, 0.73688797,
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1.00000000, 0.87576611, 0.75326132,
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1.00000000, 0.88267187, 0.76921169,
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1.00000000, 0.88933596, 0.78475236,
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1.00000000, 0.89576933, 0.79989606,
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1.00000000, 0.90198230, 0.81465502,
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1.00000000, 0.90963069, 0.82838210,
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1.00000000, 0.91710889, 0.84190889,
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1.00000000, 0.92441842, 0.85523742,
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1.00000000, 0.93156127, 0.86836903,
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1.00000000, 0.93853986, 0.88130458,
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1.00000000, 0.94535695, 0.89404470,
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1.00000000, 0.95201559, 0.90658983,
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1.00000000, 0.95851906, 0.91894041,
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1.00000000, 0.96487079, 0.93109690,
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1.00000000, 0.97107439, 0.94305985,
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1.00000000, 0.97713351, 0.95482993,
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1.00000000, 0.98305189, 0.96640795,
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1.00000000, 0.98883326, 0.97779486,
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1.00000000, 0.99448139, 0.98899179,
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1.00000000, 1.00000000, 1.00000000,
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0.98947904, 0.99348723, 1.00000000,
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0.97940448, 0.98722715, 1.00000000,
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0.96975025, 0.98120637, 1.00000000,
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0.96049223, 0.97541240, 1.00000000,
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0.95160805, 0.96983355, 1.00000000,
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0.94303638, 0.96443333, 1.00000000,
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0.93480451, 0.95923080, 1.00000000,
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0.92689056, 0.95421394, 1.00000000,
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0.91927697, 0.94937330, 1.00000000,
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0.91194747, 0.94470005, 1.00000000,
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0.90488690, 0.94018594, 1.00000000,
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0.89808115, 0.93582323, 1.00000000,
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0.89151710, 0.93160469, 1.00000000,
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0.88518247, 0.92752354, 1.00000000,
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0.87906581, 0.92357340, 1.00000000,
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0.87315640, 0.91974827, 1.00000000,
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0.86744421, 0.91604254, 1.00000000,
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0.86191983, 0.91245088, 1.00000000,
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0.85657444, 0.90896831, 1.00000000,
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0.85139976, 0.90559011, 1.00000000,
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0.84638799, 0.90231183, 1.00000000,
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0.84153180, 0.89912926, 1.00000000,
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0.83682430, 0.89603843, 1.00000000,
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0.83225897, 0.89303558, 1.00000000,
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0.82782969, 0.89011714, 1.00000000,
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0.82353066, 0.88727974, 1.00000000,
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0.81935641, 0.88452017, 1.00000000,
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0.81530175, 0.88183541, 1.00000000,
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0.81136180, 0.87922257, 1.00000000,
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0.80753191, 0.87667891, 1.00000000,
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0.80380769, 0.87420182, 1.00000000,
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0.80018497, 0.87178882, 1.00000000,
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0.79665980, 0.86943756, 1.00000000,
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0.79322843, 0.86714579, 1.00000000,
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0.78988728, 0.86491137, 1.00000000,
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0.78663296, 0.86273225, 1.00000000,
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0.78346225, 0.86060650, 1.00000000,
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0.78037207, 0.85853224, 1.00000000,
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0.77735950, 0.85650771, 1.00000000,
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0.77442176, 0.85453121, 1.00000000,
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0.77155617, 0.85260112, 1.00000000,
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0.76876022, 0.85071588, 1.00000000,
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0.76603147, 0.84887402, 1.00000000,
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0.76336762, 0.84707411, 1.00000000,
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0.76076645, 0.84531479, 1.00000000,
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0.75822586, 0.84359476, 1.00000000,
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0.75574383, 0.84191277, 1.00000000,
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0.75331843, 0.84026762, 1.00000000,
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0.75094780, 0.83865816, 1.00000000,
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0.74863017, 0.83708329, 1.00000000,
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0.74636386, 0.83554194, 1.00000000,
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0.74414722, 0.83403311, 1.00000000,
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0.74197871, 0.83255582, 1.00000000,
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0.73985682, 0.83110912, 1.00000000,
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0.73778012, 0.82969211, 1.00000000,
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0.73574723, 0.82830393, 1.00000000,
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0.73375683, 0.82694373, 1.00000000,
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0.73180765, 0.82561071, 1.00000000,
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0.72989845, 0.82430410, 1.00000000,
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0.72802807, 0.82302316, 1.00000000,
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0.72619537, 0.82176715, 1.00000000,
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0.72439927, 0.82053539, 1.00000000,
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0.72263872, 0.81932722, 1.00000000,
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0.72091270, 0.81814197, 1.00000000,
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0.71922025, 0.81697905, 1.00000000,
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0.71756043, 0.81583783, 1.00000000,
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0.71593234, 0.81471775, 1.00000000,
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0.71433510, 0.81361825, 1.00000000,
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0.71276788, 0.81253878, 1.00000000,
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0.71122987, 0.81147883, 1.00000000,
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0.70972029, 0.81043789, 1.00000000,
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0.70823838, 0.80941546, 1.00000000,
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0.70678342, 0.80841109, 1.00000000,
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0.70535469, 0.80742432, 1.00000000,
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0.70395153, 0.80645469, 1.00000000,
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0.70257327, 0.80550180, 1.00000000,
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0.70121928, 0.80456522, 1.00000000,
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0.69988894, 0.80364455, 1.00000000,
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0.69858167, 0.80273941, 1.00000000,
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0.69729688, 0.80184943, 1.00000000,
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0.69603402, 0.80097423, 1.00000000,
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0.69479255, 0.80011347, 1.00000000,
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0.69357196, 0.79926681, 1.00000000,
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0.69237173, 0.79843391, 1.00000000,
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0.69119138, 0.79761446, 1.00000000,
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0.69003044, 0.79680814, 1.00000000,
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0.68888844, 0.79601466, 1.00000000,
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0.68776494, 0.79523371, 1.00000000,
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0.68665951, 0.79446502, 1.00000000,
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0.68557173, 0.79370830, 1.00000000,
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0.68450119, 0.79296330, 1.00000000,
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0.68344751, 0.79222975, 1.00000000,
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0.68241029, 0.79150740, 1.00000000,
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0.68138918, 0.79079600, 1.00000000,
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0.68038380, 0.79009531, 1.00000000,
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0.67939381, 0.78940511, 1.00000000,
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0.67841888, 0.78872517, 1.00000000,
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0.67745866, 0.78805526, 1.00000000,
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0.67651284, 0.78739518, 1.00000000,
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0.67558112, 0.78674472, 1.00000000,
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0.67466317, 0.78610368, 1.00000000,
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0.67375872, 0.78547186, 1.00000000,
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0.67286748, 0.78484907, 1.00000000,
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0.67198916, 0.78423512, 1.00000000,
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0.67112350, 0.78362984, 1.00000000,
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0.67027024, 0.78303305, 1.00000000,
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0.66942911, 0.78244457, 1.00000000,
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0.66859988, 0.78186425, 1.00000000,
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0.66778228, 0.78129191, 1.00000000,
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0.66697610, 0.78072740, 1.00000000,
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0.66618110, 0.78017057, 1.00000000,
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0.66539706, 0.77962127, 1.00000000,
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0.66462376, 0.77907934, 1.00000000,
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0.66386098, 0.77854465, 1.00000000,
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0.66310852, 0.77801705, 1.00000000,
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0.66236618, 0.77749642, 1.00000000,
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0.66163375, 0.77698261, 1.00000000,
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0.66091106, 0.77647551, 1.00000000,
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0.66019791, 0.77597498, 1.00000000,
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0.65949412, 0.77548090, 1.00000000,
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0.65879952, 0.77499315, 1.00000000,
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0.65811392, 0.77451161, 1.00000000,
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0.65743716, 0.77403618, 1.00000000,
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0.65676908, 0.77356673, 1.00000000,
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0.65610952, 0.77310316, 1.00000000,
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0.65545831, 0.77264537, 1.00000000,
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0.65481530, 0.77219324, 1.00000000,
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0.65418036, 0.77174669, 1.00000000,
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0.65355332, 0.77130560, 1.00000000,
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0.65293404, 0.77086988, 1.00000000,
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0.65232240, 0.77043944, 1.00000000,
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0.65171824, 0.77001419, 1.00000000,
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0.65112144, 0.76959404, 1.00000000,
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0.65053187, 0.76917889, 1.00000000,
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0.64994941, 0.76876866, 1.00000000,
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0.64937392, 0.76836326, 1.00000000
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};
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}
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