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|
/*
* $Id: color.c,v 1.15 2010/02/05 23:50:22 simakov Exp $
*
* EPSILON - wavelet image compression library.
* Copyright (C) 2006,2007,2010 Alexander Simakov, <xander@entropyware.info>
*
* This file is part of EPSILON
*
* EPSILON is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* EPSILON 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with EPSILON. If not, see <http://www.gnu.org/licenses/>.
*
* http://epsilon-project.sourceforge.net
*/
#include <common.h>
#include <color.h>
/* Look-up tables for increase RGB to YCbCr conversion speed */
local double O_299000[256] = {
0, 0.299, 0.598, 0.897, 1.196, 1.495, 1.794, 2.093,
2.392, 2.691, 2.99, 3.289, 3.588, 3.887, 4.186, 4.485,
4.784, 5.083, 5.382, 5.681, 5.98, 6.279, 6.578, 6.877,
7.176, 7.475, 7.774, 8.073, 8.372, 8.671, 8.97, 9.269,
9.568, 9.867, 10.166, 10.465, 10.764, 11.063, 11.362, 11.661,
11.96, 12.259, 12.558, 12.857, 13.156, 13.455, 13.754, 14.053,
14.352, 14.651, 14.95, 15.249, 15.548, 15.847, 16.146, 16.445,
16.744, 17.043, 17.342, 17.641, 17.94, 18.239, 18.538, 18.837,
19.136, 19.435, 19.734, 20.033, 20.332, 20.631, 20.93, 21.229,
21.528, 21.827, 22.126, 22.425, 22.724, 23.023, 23.322, 23.621,
23.92, 24.219, 24.518, 24.817, 25.116, 25.415, 25.714, 26.013,
26.312, 26.611, 26.91, 27.209, 27.508, 27.807, 28.106, 28.405,
28.704, 29.003, 29.302, 29.601, 29.9, 30.199, 30.498, 30.797,
31.096, 31.395, 31.694, 31.993, 32.292, 32.591, 32.89, 33.189,
33.488, 33.787, 34.086, 34.385, 34.684, 34.983, 35.282, 35.581,
35.88, 36.179, 36.478, 36.777, 37.076, 37.375, 37.674, 37.973,
38.272, 38.571, 38.87, 39.169, 39.468, 39.767, 40.066, 40.365,
40.664, 40.963, 41.262, 41.561, 41.86, 42.159, 42.458, 42.757,
43.056, 43.355, 43.654, 43.953, 44.252, 44.551, 44.85, 45.149,
45.448, 45.747, 46.046, 46.345, 46.644, 46.943, 47.242, 47.541,
47.84, 48.139, 48.438, 48.737, 49.036, 49.335, 49.634, 49.933,
50.232, 50.531, 50.83, 51.129, 51.428, 51.727, 52.026, 52.325,
52.624, 52.923, 53.222, 53.521, 53.82, 54.119, 54.418, 54.717,
55.016, 55.315, 55.614, 55.913, 56.212, 56.511, 56.81, 57.109,
57.408, 57.707, 58.006, 58.305, 58.604, 58.903, 59.202, 59.501,
59.8, 60.099, 60.398, 60.697, 60.996, 61.295, 61.594, 61.893,
62.192, 62.491, 62.79, 63.089, 63.388, 63.687, 63.986, 64.285,
64.584, 64.883, 65.182, 65.481, 65.78, 66.079, 66.378, 66.677,
66.976, 67.275, 67.574, 67.873, 68.172, 68.471, 68.77, 69.069,
69.368, 69.667, 69.966, 70.265, 70.564, 70.863, 71.162, 71.461,
71.76, 72.059, 72.358, 72.657, 72.956, 73.255, 73.554, 73.853,
74.152, 74.451, 74.75, 75.049, 75.348, 75.647, 75.946, 76.245,
};
local double O_587000[256] = {
0, 0.587, 1.174, 1.761, 2.348, 2.935, 3.522, 4.109,
4.696, 5.283, 5.87, 6.457, 7.044, 7.631, 8.218, 8.805,
9.392, 9.979, 10.566, 11.153, 11.74, 12.327, 12.914, 13.501,
14.088, 14.675, 15.262, 15.849, 16.436, 17.023, 17.61, 18.197,
18.784, 19.371, 19.958, 20.545, 21.132, 21.719, 22.306, 22.893,
23.48, 24.067, 24.654, 25.241, 25.828, 26.415, 27.002, 27.589,
28.176, 28.763, 29.35, 29.937, 30.524, 31.111, 31.698, 32.285,
32.872, 33.459, 34.046, 34.633, 35.22, 35.807, 36.394, 36.981,
37.568, 38.155, 38.742, 39.329, 39.916, 40.503, 41.09, 41.677,
42.264, 42.851, 43.438, 44.025, 44.612, 45.199, 45.786, 46.373,
46.96, 47.547, 48.134, 48.721, 49.308, 49.895, 50.482, 51.069,
51.656, 52.243, 52.83, 53.417, 54.004, 54.591, 55.178, 55.765,
56.352, 56.939, 57.526, 58.113, 58.7, 59.287, 59.874, 60.461,
61.048, 61.635, 62.222, 62.809, 63.396, 63.983, 64.57, 65.157,
65.744, 66.331, 66.918, 67.505, 68.092, 68.679, 69.266, 69.853,
70.44, 71.027, 71.614, 72.201, 72.788, 73.375, 73.962, 74.549,
75.136, 75.723, 76.31, 76.897, 77.484, 78.071, 78.658, 79.245,
79.832, 80.419, 81.006, 81.593, 82.18, 82.767, 83.354, 83.941,
84.528, 85.115, 85.702, 86.289, 86.876, 87.463, 88.05, 88.637,
89.224, 89.811, 90.398, 90.985, 91.572, 92.159, 92.746, 93.333,
93.92, 94.507, 95.094, 95.681, 96.268, 96.855, 97.442, 98.029,
98.616, 99.203, 99.79, 100.377, 100.964, 101.551, 102.138, 102.725,
103.312, 103.899, 104.486, 105.073, 105.66, 106.247, 106.834, 107.421,
108.008, 108.595, 109.182, 109.769, 110.356, 110.943, 111.53, 112.117,
112.704, 113.291, 113.878, 114.465, 115.052, 115.639, 116.226, 116.813,
117.4, 117.987, 118.574, 119.161, 119.748, 120.335, 120.922, 121.509,
122.096, 122.683, 123.27, 123.857, 124.444, 125.031, 125.618, 126.205,
126.792, 127.379, 127.966, 128.553, 129.14, 129.727, 130.314, 130.901,
131.488, 132.075, 132.662, 133.249, 133.836, 134.423, 135.01, 135.597,
136.184, 136.771, 137.358, 137.945, 138.532, 139.119, 139.706, 140.293,
140.88, 141.467, 142.054, 142.641, 143.228, 143.815, 144.402, 144.989,
145.576, 146.163, 146.75, 147.337, 147.924, 148.511, 149.098, 149.685,
};
local double O_114000[256] = {
0, 0.114, 0.228, 0.342, 0.456, 0.57, 0.684, 0.798,
0.912, 1.026, 1.14, 1.254, 1.368, 1.482, 1.596, 1.71,
1.824, 1.938, 2.052, 2.166, 2.28, 2.394, 2.508, 2.622,
2.736, 2.85, 2.964, 3.078, 3.192, 3.306, 3.42, 3.534,
3.648, 3.762, 3.876, 3.99, 4.104, 4.218, 4.332, 4.446,
4.56, 4.674, 4.788, 4.902, 5.016, 5.13, 5.244, 5.358,
5.472, 5.586, 5.7, 5.814, 5.928, 6.042, 6.156, 6.27,
6.384, 6.498, 6.612, 6.726, 6.84, 6.954, 7.068, 7.182,
7.296, 7.41, 7.524, 7.638, 7.752, 7.866, 7.98, 8.094,
8.208, 8.322, 8.436, 8.55, 8.664, 8.778, 8.892, 9.006,
9.12, 9.234, 9.348, 9.462, 9.576, 9.69, 9.804, 9.918,
10.032, 10.146, 10.26, 10.374, 10.488, 10.602, 10.716, 10.83,
10.944, 11.058, 11.172, 11.286, 11.4, 11.514, 11.628, 11.742,
11.856, 11.97, 12.084, 12.198, 12.312, 12.426, 12.54, 12.654,
12.768, 12.882, 12.996, 13.11, 13.224, 13.338, 13.452, 13.566,
13.68, 13.794, 13.908, 14.022, 14.136, 14.25, 14.364, 14.478,
14.592, 14.706, 14.82, 14.934, 15.048, 15.162, 15.276, 15.39,
15.504, 15.618, 15.732, 15.846, 15.96, 16.074, 16.188, 16.302,
16.416, 16.53, 16.644, 16.758, 16.872, 16.986, 17.1, 17.214,
17.328, 17.442, 17.556, 17.67, 17.784, 17.898, 18.012, 18.126,
18.24, 18.354, 18.468, 18.582, 18.696, 18.81, 18.924, 19.038,
19.152, 19.266, 19.38, 19.494, 19.608, 19.722, 19.836, 19.95,
20.064, 20.178, 20.292, 20.406, 20.52, 20.634, 20.748, 20.862,
20.976, 21.09, 21.204, 21.318, 21.432, 21.546, 21.66, 21.774,
21.888, 22.002, 22.116, 22.23, 22.344, 22.458, 22.572, 22.686,
22.8, 22.914, 23.028, 23.142, 23.256, 23.37, 23.484, 23.598,
23.712, 23.826, 23.94, 24.054, 24.168, 24.282, 24.396, 24.51,
24.624, 24.738, 24.852, 24.966, 25.08, 25.194, 25.308, 25.422,
25.536, 25.65, 25.764, 25.878, 25.992, 26.106, 26.22, 26.334,
26.448, 26.562, 26.676, 26.79, 26.904, 27.018, 27.132, 27.246,
27.36, 27.474, 27.588, 27.702, 27.816, 27.93, 28.044, 28.158,
28.272, 28.386, 28.5, 28.614, 28.728, 28.842, 28.956, 29.07,
};
local double O_168736[256] = {
0, 0.168736, 0.337472, 0.506208, 0.674944, 0.84368, 1.01242, 1.18115,
1.34989, 1.51862, 1.68736, 1.8561, 2.02483, 2.19357, 2.3623, 2.53104,
2.69978, 2.86851, 3.03725, 3.20598, 3.37472, 3.54346, 3.71219, 3.88093,
4.04966, 4.2184, 4.38714, 4.55587, 4.72461, 4.89334, 5.06208, 5.23082,
5.39955, 5.56829, 5.73702, 5.90576, 6.0745, 6.24323, 6.41197, 6.5807,
6.74944, 6.91818, 7.08691, 7.25565, 7.42438, 7.59312, 7.76186, 7.93059,
8.09933, 8.26806, 8.4368, 8.60554, 8.77427, 8.94301, 9.11174, 9.28048,
9.44922, 9.61795, 9.78669, 9.95542, 10.1242, 10.2929, 10.4616, 10.6304,
10.7991, 10.9678, 11.1366, 11.3053, 11.474, 11.6428, 11.8115, 11.9803,
12.149, 12.3177, 12.4865, 12.6552, 12.8239, 12.9927, 13.1614, 13.3301,
13.4989, 13.6676, 13.8364, 14.0051, 14.1738, 14.3426, 14.5113, 14.68,
14.8488, 15.0175, 15.1862, 15.355, 15.5237, 15.6924, 15.8612, 16.0299,
16.1987, 16.3674, 16.5361, 16.7049, 16.8736, 17.0423, 17.2111, 17.3798,
17.5485, 17.7173, 17.886, 18.0548, 18.2235, 18.3922, 18.561, 18.7297,
18.8984, 19.0672, 19.2359, 19.4046, 19.5734, 19.7421, 19.9108, 20.0796,
20.2483, 20.4171, 20.5858, 20.7545, 20.9233, 21.092, 21.2607, 21.4295,
21.5982, 21.7669, 21.9357, 22.1044, 22.2732, 22.4419, 22.6106, 22.7794,
22.9481, 23.1168, 23.2856, 23.4543, 23.623, 23.7918, 23.9605, 24.1292,
24.298, 24.4667, 24.6355, 24.8042, 24.9729, 25.1417, 25.3104, 25.4791,
25.6479, 25.8166, 25.9853, 26.1541, 26.3228, 26.4916, 26.6603, 26.829,
26.9978, 27.1665, 27.3352, 27.504, 27.6727, 27.8414, 28.0102, 28.1789,
28.3476, 28.5164, 28.6851, 28.8539, 29.0226, 29.1913, 29.3601, 29.5288,
29.6975, 29.8663, 30.035, 30.2037, 30.3725, 30.5412, 30.71, 30.8787,
31.0474, 31.2162, 31.3849, 31.5536, 31.7224, 31.8911, 32.0598, 32.2286,
32.3973, 32.566, 32.7348, 32.9035, 33.0723, 33.241, 33.4097, 33.5785,
33.7472, 33.9159, 34.0847, 34.2534, 34.4221, 34.5909, 34.7596, 34.9284,
35.0971, 35.2658, 35.4346, 35.6033, 35.772, 35.9408, 36.1095, 36.2782,
36.447, 36.6157, 36.7844, 36.9532, 37.1219, 37.2907, 37.4594, 37.6281,
37.7969, 37.9656, 38.1343, 38.3031, 38.4718, 38.6405, 38.8093, 38.978,
39.1468, 39.3155, 39.4842, 39.653, 39.8217, 39.9904, 40.1592, 40.3279,
40.4966, 40.6654, 40.8341, 41.0028, 41.1716, 41.3403, 41.5091, 41.6778,
41.8465, 42.0153, 42.184, 42.3527, 42.5215, 42.6902, 42.8589, 43.0277,
};
local double O_331264[256] = {
0, 0.331264, 0.662528, 0.993792, 1.32506, 1.65632, 1.98758, 2.31885,
2.65011, 2.98138, 3.31264, 3.6439, 3.97517, 4.30643, 4.6377, 4.96896,
5.30022, 5.63149, 5.96275, 6.29402, 6.62528, 6.95654, 7.28781, 7.61907,
7.95034, 8.2816, 8.61286, 8.94413, 9.27539, 9.60666, 9.93792, 10.2692,
10.6004, 10.9317, 11.263, 11.5942, 11.9255, 12.2568, 12.588, 12.9193,
13.2506, 13.5818, 13.9131, 14.2444, 14.5756, 14.9069, 15.2381, 15.5694,
15.9007, 16.2319, 16.5632, 16.8945, 17.2257, 17.557, 17.8883, 18.2195,
18.5508, 18.882, 19.2133, 19.5446, 19.8758, 20.2071, 20.5384, 20.8696,
21.2009, 21.5322, 21.8634, 22.1947, 22.526, 22.8572, 23.1885, 23.5197,
23.851, 24.1823, 24.5135, 24.8448, 25.1761, 25.5073, 25.8386, 26.1699,
26.5011, 26.8324, 27.1636, 27.4949, 27.8262, 28.1574, 28.4887, 28.82,
29.1512, 29.4825, 29.8138, 30.145, 30.4763, 30.8076, 31.1388, 31.4701,
31.8013, 32.1326, 32.4639, 32.7951, 33.1264, 33.4577, 33.7889, 34.1202,
34.4515, 34.7827, 35.114, 35.4452, 35.7765, 36.1078, 36.439, 36.7703,
37.1016, 37.4328, 37.7641, 38.0954, 38.4266, 38.7579, 39.0892, 39.4204,
39.7517, 40.0829, 40.4142, 40.7455, 41.0767, 41.408, 41.7393, 42.0705,
42.4018, 42.7331, 43.0643, 43.3956, 43.7268, 44.0581, 44.3894, 44.7206,
45.0519, 45.3832, 45.7144, 46.0457, 46.377, 46.7082, 47.0395, 47.3708,
47.702, 48.0333, 48.3645, 48.6958, 49.0271, 49.3583, 49.6896, 50.0209,
50.3521, 50.6834, 51.0147, 51.3459, 51.6772, 52.0084, 52.3397, 52.671,
53.0022, 53.3335, 53.6648, 53.996, 54.3273, 54.6586, 54.9898, 55.3211,
55.6524, 55.9836, 56.3149, 56.6461, 56.9774, 57.3087, 57.6399, 57.9712,
58.3025, 58.6337, 58.965, 59.2963, 59.6275, 59.9588, 60.29, 60.6213,
60.9526, 61.2838, 61.6151, 61.9464, 62.2776, 62.6089, 62.9402, 63.2714,
63.6027, 63.934, 64.2652, 64.5965, 64.9277, 65.259, 65.5903, 65.9215,
66.2528, 66.5841, 66.9153, 67.2466, 67.5779, 67.9091, 68.2404, 68.5716,
68.9029, 69.2342, 69.5654, 69.8967, 70.228, 70.5592, 70.8905, 71.2218,
71.553, 71.8843, 72.2156, 72.5468, 72.8781, 73.2093, 73.5406, 73.8719,
74.2031, 74.5344, 74.8657, 75.1969, 75.5282, 75.8595, 76.1907, 76.522,
76.8532, 77.1845, 77.5158, 77.847, 78.1783, 78.5096, 78.8408, 79.1721,
79.5034, 79.8346, 80.1659, 80.4972, 80.8284, 81.1597, 81.4909, 81.8222,
82.1535, 82.4847, 82.816, 83.1473, 83.4785, 83.8098, 84.1411, 84.4723,
};
local double O_500000[256] = {
0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5,
4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5,
8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5,
12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5,
16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5,
20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5,
24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5,
28, 28.5, 29, 29.5, 30, 30.5, 31, 31.5,
32, 32.5, 33, 33.5, 34, 34.5, 35, 35.5,
36, 36.5, 37, 37.5, 38, 38.5, 39, 39.5,
40, 40.5, 41, 41.5, 42, 42.5, 43, 43.5,
44, 44.5, 45, 45.5, 46, 46.5, 47, 47.5,
48, 48.5, 49, 49.5, 50, 50.5, 51, 51.5,
52, 52.5, 53, 53.5, 54, 54.5, 55, 55.5,
56, 56.5, 57, 57.5, 58, 58.5, 59, 59.5,
60, 60.5, 61, 61.5, 62, 62.5, 63, 63.5,
64, 64.5, 65, 65.5, 66, 66.5, 67, 67.5,
68, 68.5, 69, 69.5, 70, 70.5, 71, 71.5,
72, 72.5, 73, 73.5, 74, 74.5, 75, 75.5,
76, 76.5, 77, 77.5, 78, 78.5, 79, 79.5,
80, 80.5, 81, 81.5, 82, 82.5, 83, 83.5,
84, 84.5, 85, 85.5, 86, 86.5, 87, 87.5,
88, 88.5, 89, 89.5, 90, 90.5, 91, 91.5,
92, 92.5, 93, 93.5, 94, 94.5, 95, 95.5,
96, 96.5, 97, 97.5, 98, 98.5, 99, 99.5,
100, 100.5, 101, 101.5, 102, 102.5, 103, 103.5,
104, 104.5, 105, 105.5, 106, 106.5, 107, 107.5,
108, 108.5, 109, 109.5, 110, 110.5, 111, 111.5,
112, 112.5, 113, 113.5, 114, 114.5, 115, 115.5,
116, 116.5, 117, 117.5, 118, 118.5, 119, 119.5,
120, 120.5, 121, 121.5, 122, 122.5, 123, 123.5,
124, 124.5, 125, 125.5, 126, 126.5, 127, 127.5,
};
local double O_418688[256] = {
0, 0.418688, 0.837376, 1.25606, 1.67475, 2.09344, 2.51213, 2.93082,
3.3495, 3.76819, 4.18688, 4.60557, 5.02426, 5.44294, 5.86163, 6.28032,
6.69901, 7.1177, 7.53638, 7.95507, 8.37376, 8.79245, 9.21114, 9.62982,
10.0485, 10.4672, 10.8859, 11.3046, 11.7233, 12.142, 12.5606, 12.9793,
13.398, 13.8167, 14.2354, 14.6541, 15.0728, 15.4915, 15.9101, 16.3288,
16.7475, 17.1662, 17.5849, 18.0036, 18.4223, 18.841, 19.2596, 19.6783,
20.097, 20.5157, 20.9344, 21.3531, 21.7718, 22.1905, 22.6092, 23.0278,
23.4465, 23.8652, 24.2839, 24.7026, 25.1213, 25.54, 25.9587, 26.3773,
26.796, 27.2147, 27.6334, 28.0521, 28.4708, 28.8895, 29.3082, 29.7268,
30.1455, 30.5642, 30.9829, 31.4016, 31.8203, 32.239, 32.6577, 33.0764,
33.495, 33.9137, 34.3324, 34.7511, 35.1698, 35.5885, 36.0072, 36.4259,
36.8445, 37.2632, 37.6819, 38.1006, 38.5193, 38.938, 39.3567, 39.7754,
40.194, 40.6127, 41.0314, 41.4501, 41.8688, 42.2875, 42.7062, 43.1249,
43.5436, 43.9622, 44.3809, 44.7996, 45.2183, 45.637, 46.0557, 46.4744,
46.8931, 47.3117, 47.7304, 48.1491, 48.5678, 48.9865, 49.4052, 49.8239,
50.2426, 50.6612, 51.0799, 51.4986, 51.9173, 52.336, 52.7547, 53.1734,
53.5921, 54.0108, 54.4294, 54.8481, 55.2668, 55.6855, 56.1042, 56.5229,
56.9416, 57.3603, 57.7789, 58.1976, 58.6163, 59.035, 59.4537, 59.8724,
60.2911, 60.7098, 61.1284, 61.5471, 61.9658, 62.3845, 62.8032, 63.2219,
63.6406, 64.0593, 64.478, 64.8966, 65.3153, 65.734, 66.1527, 66.5714,
66.9901, 67.4088, 67.8275, 68.2461, 68.6648, 69.0835, 69.5022, 69.9209,
70.3396, 70.7583, 71.177, 71.5956, 72.0143, 72.433, 72.8517, 73.2704,
73.6891, 74.1078, 74.5265, 74.9452, 75.3638, 75.7825, 76.2012, 76.6199,
77.0386, 77.4573, 77.876, 78.2947, 78.7133, 79.132, 79.5507, 79.9694,
80.3881, 80.8068, 81.2255, 81.6442, 82.0628, 82.4815, 82.9002, 83.3189,
83.7376, 84.1563, 84.575, 84.9937, 85.4124, 85.831, 86.2497, 86.6684,
87.0871, 87.5058, 87.9245, 88.3432, 88.7619, 89.1805, 89.5992, 90.0179,
90.4366, 90.8553, 91.274, 91.6927, 92.1114, 92.53, 92.9487, 93.3674,
93.7861, 94.2048, 94.6235, 95.0422, 95.4609, 95.8796, 96.2982, 96.7169,
97.1356, 97.5543, 97.973, 98.3917, 98.8104, 99.2291, 99.6477, 100.066,
100.485, 100.904, 101.322, 101.741, 102.16, 102.579, 102.997, 103.416,
103.835, 104.253, 104.672, 105.091, 105.509, 105.928, 106.347, 106.765,
};
local double O_081312[256] = {
0, 0.081312, 0.162624, 0.243936, 0.325248, 0.40656, 0.487872, 0.569184,
0.650496, 0.731808, 0.81312, 0.894432, 0.975744, 1.05706, 1.13837, 1.21968,
1.30099, 1.3823, 1.46362, 1.54493, 1.62624, 1.70755, 1.78886, 1.87018,
1.95149, 2.0328, 2.11411, 2.19542, 2.27674, 2.35805, 2.43936, 2.52067,
2.60198, 2.6833, 2.76461, 2.84592, 2.92723, 3.00854, 3.08986, 3.17117,
3.25248, 3.33379, 3.4151, 3.49642, 3.57773, 3.65904, 3.74035, 3.82166,
3.90298, 3.98429, 4.0656, 4.14691, 4.22822, 4.30954, 4.39085, 4.47216,
4.55347, 4.63478, 4.7161, 4.79741, 4.87872, 4.96003, 5.04134, 5.12266,
5.20397, 5.28528, 5.36659, 5.4479, 5.52922, 5.61053, 5.69184, 5.77315,
5.85446, 5.93578, 6.01709, 6.0984, 6.17971, 6.26102, 6.34234, 6.42365,
6.50496, 6.58627, 6.66758, 6.7489, 6.83021, 6.91152, 6.99283, 7.07414,
7.15546, 7.23677, 7.31808, 7.39939, 7.4807, 7.56202, 7.64333, 7.72464,
7.80595, 7.88726, 7.96858, 8.04989, 8.1312, 8.21251, 8.29382, 8.37514,
8.45645, 8.53776, 8.61907, 8.70038, 8.7817, 8.86301, 8.94432, 9.02563,
9.10694, 9.18826, 9.26957, 9.35088, 9.43219, 9.5135, 9.59482, 9.67613,
9.75744, 9.83875, 9.92006, 10.0014, 10.0827, 10.164, 10.2453, 10.3266,
10.4079, 10.4892, 10.5706, 10.6519, 10.7332, 10.8145, 10.8958, 10.9771,
11.0584, 11.1397, 11.2211, 11.3024, 11.3837, 11.465, 11.5463, 11.6276,
11.7089, 11.7902, 11.8716, 11.9529, 12.0342, 12.1155, 12.1968, 12.2781,
12.3594, 12.4407, 12.522, 12.6034, 12.6847, 12.766, 12.8473, 12.9286,
13.0099, 13.0912, 13.1725, 13.2539, 13.3352, 13.4165, 13.4978, 13.5791,
13.6604, 13.7417, 13.823, 13.9044, 13.9857, 14.067, 14.1483, 14.2296,
14.3109, 14.3922, 14.4735, 14.5548, 14.6362, 14.7175, 14.7988, 14.8801,
14.9614, 15.0427, 15.124, 15.2053, 15.2867, 15.368, 15.4493, 15.5306,
15.6119, 15.6932, 15.7745, 15.8558, 15.9372, 16.0185, 16.0998, 16.1811,
16.2624, 16.3437, 16.425, 16.5063, 16.5876, 16.669, 16.7503, 16.8316,
16.9129, 16.9942, 17.0755, 17.1568, 17.2381, 17.3195, 17.4008, 17.4821,
17.5634, 17.6447, 17.726, 17.8073, 17.8886, 17.97, 18.0513, 18.1326,
18.2139, 18.2952, 18.3765, 18.4578, 18.5391, 18.6204, 18.7018, 18.7831,
18.8644, 18.9457, 19.027, 19.1083, 19.1896, 19.2709, 19.3523, 19.4336,
19.5149, 19.5962, 19.6775, 19.7588, 19.8401, 19.9214, 20.0028, 20.0841,
20.1654, 20.2467, 20.328, 20.4093, 20.4906, 20.5719, 20.6532, 20.7346,
};
void convert_RGB_to_YCbCr(coeff_t **R, coeff_t **G, coeff_t **B,
coeff_t **Y, coeff_t **Cb, coeff_t **Cr,
int width, int height)
{
int i, j;
assert(width > 0);
assert(height > 0);
/* Perhaps one should optimize this code with integer-valued
* look-up tables. On the other hand, the rest of the program
* (e.g. wavelet transform, resampling etc.) still using FPU.
* Moreover, additional rounding operation (even with proper
* rescaling) will involve some marginal image distortion. */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
int r = (int) R[i][j];
int g = (int) G[i][j];
int b = (int) B[i][j];
Y[i][j] = O_299000[r] + O_587000[g] + O_114000[b];
Cb[i][j] = -O_168736[r] - O_331264[g] + O_500000[b] + 128.0;
Cr[i][j] = O_500000[r] - O_418688[g] - O_081312[b] + 128.0;
}
}
}
void convert_YCbCr_to_RGB(coeff_t **Y, coeff_t **Cb, coeff_t **Cr,
coeff_t **R, coeff_t **G, coeff_t **B,
int width, int height)
{
int i, j;
assert(width > 0);
assert(height > 0);
/* Due to rounding and quantization errors output RGB values
* may not be enclosed within [0..255] interval. To solve
* this problem the values are clipped after transformation. */
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
R[i][j] = CLIP(Y[i][j] + (Cr[i][j] - 128.0) * 1.402);
G[i][j] = CLIP(Y[i][j] - (Cb[i][j] - 128.0) * 0.34413 - (Cr[i][j] - 128.0) * 0.71414);
B[i][j] = CLIP(Y[i][j] + (Cb[i][j] - 128.0) * 1.772);
}
}
}
void clip_channel(coeff_t **channel, int width, int height)
{
int i, j;
assert(width > 0);
assert(height > 0);
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
channel[i][j] = CLIP(channel[i][j]);
}
}
}
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