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color_transform.h
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color_transform.h
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/*
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef KNUSPERLI_COLOR_TRANSFORM_H_
#define KNUSPERLI_COLOR_TRANSFORM_H_
namespace knusperli {
static const int kCrToRedTable[256] = {
-179, -178, -177, -175, -174, -172, -171, -170, -168, -167, -165, -164,
-163, -161, -160, -158, -157, -156, -154, -153, -151, -150, -149, -147,
-146, -144, -143, -142, -140, -139, -137, -136, -135, -133, -132, -130,
-129, -128, -126, -125, -123, -122, -121, -119, -118, -116, -115, -114,
-112, -111, -109, -108, -107, -105, -104, -102, -101, -100, -98, -97,
-95, -94, -93, -91, -90, -88, -87, -86, -84, -83, -81, -80,
-79, -77, -76, -74, -73, -72, -70, -69, -67, -66, -64, -63,
-62, -60, -59, -57, -56, -55, -53, -52, -50, -49, -48, -46,
-45, -43, -42, -41, -39, -38, -36, -35, -34, -32, -31, -29,
-28, -27, -25, -24, -22, -21, -20, -18, -17, -15, -14, -13,
-11, -10, -8, -7, -6, -4, -3, -1, 0, 1, 3, 4,
6, 7, 8, 10, 11, 13, 14, 15, 17, 18, 20, 21,
22, 24, 25, 27, 28, 29, 31, 32, 34, 35, 36, 38,
39, 41, 42, 43, 45, 46, 48, 49, 50, 52, 53, 55,
56, 57, 59, 60, 62, 63, 64, 66, 67, 69, 70, 72,
73, 74, 76, 77, 79, 80, 81, 83, 84, 86, 87, 88,
90, 91, 93, 94, 95, 97, 98, 100, 101, 102, 104, 105,
107, 108, 109, 111, 112, 114, 115, 116, 118, 119, 121, 122,
123, 125, 126, 128, 129, 130, 132, 133, 135, 136, 137, 139,
140, 142, 143, 144, 146, 147, 149, 150, 151, 153, 154, 156,
157, 158, 160, 161, 163, 164, 165, 167, 168, 170, 171, 172,
174, 175, 177, 178
};
static const int kCbToBlueTable[256] = {
-227, -225, -223, -222, -220, -218, -216, -214, -213, -211, -209, -207,
-206, -204, -202, -200, -198, -197, -195, -193, -191, -190, -188, -186,
-184, -183, -181, -179, -177, -175, -174, -172, -170, -168, -167, -165,
-163, -161, -159, -158, -156, -154, -152, -151, -149, -147, -145, -144,
-142, -140, -138, -136, -135, -133, -131, -129, -128, -126, -124, -122,
-120, -119, -117, -115, -113, -112, -110, -108, -106, -105, -103, -101,
-99, -97, -96, -94, -92, -90, -89, -87, -85, -83, -82, -80,
-78, -76, -74, -73, -71, -69, -67, -66, -64, -62, -60, -58,
-57, -55, -53, -51, -50, -48, -46, -44, -43, -41, -39, -37,
-35, -34, -32, -30, -28, -27, -25, -23, -21, -19, -18, -16,
-14, -12, -11, -9, -7, -5, -4, -2, 0, 2, 4, 5,
7, 9, 11, 12, 14, 16, 18, 19, 21, 23, 25, 27,
28, 30, 32, 34, 35, 37, 39, 41, 43, 44, 46, 48,
50, 51, 53, 55, 57, 58, 60, 62, 64, 66, 67, 69,
71, 73, 74, 76, 78, 80, 82, 83, 85, 87, 89, 90,
92, 94, 96, 97, 99, 101, 103, 105, 106, 108, 110, 112,
113, 115, 117, 119, 120, 122, 124, 126, 128, 129, 131, 133,
135, 136, 138, 140, 142, 144, 145, 147, 149, 151, 152, 154,
156, 158, 159, 161, 163, 165, 167, 168, 170, 172, 174, 175,
177, 179, 181, 183, 184, 186, 188, 190, 191, 193, 195, 197,
198, 200, 202, 204, 206, 207, 209, 211, 213, 214, 216, 218,
220, 222, 223, 225,
};
static const int kCrToGreenTable[256] = {
5990656, 5943854, 5897052, 5850250, 5803448, 5756646, 5709844, 5663042,
5616240, 5569438, 5522636, 5475834, 5429032, 5382230, 5335428, 5288626,
5241824, 5195022, 5148220, 5101418, 5054616, 5007814, 4961012, 4914210,
4867408, 4820606, 4773804, 4727002, 4680200, 4633398, 4586596, 4539794,
4492992, 4446190, 4399388, 4352586, 4305784, 4258982, 4212180, 4165378,
4118576, 4071774, 4024972, 3978170, 3931368, 3884566, 3837764, 3790962,
3744160, 3697358, 3650556, 3603754, 3556952, 3510150, 3463348, 3416546,
3369744, 3322942, 3276140, 3229338, 3182536, 3135734, 3088932, 3042130,
2995328, 2948526, 2901724, 2854922, 2808120, 2761318, 2714516, 2667714,
2620912, 2574110, 2527308, 2480506, 2433704, 2386902, 2340100, 2293298,
2246496, 2199694, 2152892, 2106090, 2059288, 2012486, 1965684, 1918882,
1872080, 1825278, 1778476, 1731674, 1684872, 1638070, 1591268, 1544466,
1497664, 1450862, 1404060, 1357258, 1310456, 1263654, 1216852, 1170050,
1123248, 1076446, 1029644, 982842, 936040, 889238, 842436, 795634,
748832, 702030, 655228, 608426, 561624, 514822, 468020, 421218,
374416, 327614, 280812, 234010, 187208, 140406, 93604, 46802,
0, -46802, -93604, -140406, -187208, -234010, -280812, -327614,
-374416, -421218, -468020, -514822, -561624, -608426, -655228, -702030,
-748832, -795634, -842436, -889238, -936040, -982842, -1029644, -1076446,
-1123248, -1170050, -1216852, -1263654, -1310456, -1357258, -1404060, -1450862,
-1497664, -1544466, -1591268, -1638070, -1684872, -1731674, -1778476, -1825278,
-1872080, -1918882, -1965684, -2012486, -2059288, -2106090, -2152892, -2199694,
-2246496, -2293298, -2340100, -2386902, -2433704, -2480506, -2527308, -2574110,
-2620912, -2667714, -2714516, -2761318, -2808120, -2854922, -2901724, -2948526,
-2995328, -3042130, -3088932, -3135734, -3182536, -3229338, -3276140, -3322942,
-3369744, -3416546, -3463348, -3510150, -3556952, -3603754, -3650556, -3697358,
-3744160, -3790962, -3837764, -3884566, -3931368, -3978170, -4024972, -4071774,
-4118576, -4165378, -4212180, -4258982, -4305784, -4352586, -4399388, -4446190,
-4492992, -4539794, -4586596, -4633398, -4680200, -4727002, -4773804, -4820606,
-4867408, -4914210, -4961012, -5007814, -5054616, -5101418, -5148220, -5195022,
-5241824, -5288626, -5335428, -5382230, -5429032, -5475834, -5522636, -5569438,
-5616240, -5663042, -5709844, -5756646, -5803448, -5850250, -5897052, -5943854,
};
static const int kCbToGreenTable[256] = {
2919680, 2897126, 2874572, 2852018, 2829464, 2806910, 2784356, 2761802,
2739248, 2716694, 2694140, 2671586, 2649032, 2626478, 2603924, 2581370,
2558816, 2536262, 2513708, 2491154, 2468600, 2446046, 2423492, 2400938,
2378384, 2355830, 2333276, 2310722, 2288168, 2265614, 2243060, 2220506,
2197952, 2175398, 2152844, 2130290, 2107736, 2085182, 2062628, 2040074,
2017520, 1994966, 1972412, 1949858, 1927304, 1904750, 1882196, 1859642,
1837088, 1814534, 1791980, 1769426, 1746872, 1724318, 1701764, 1679210,
1656656, 1634102, 1611548, 1588994, 1566440, 1543886, 1521332, 1498778,
1476224, 1453670, 1431116, 1408562, 1386008, 1363454, 1340900, 1318346,
1295792, 1273238, 1250684, 1228130, 1205576, 1183022, 1160468, 1137914,
1115360, 1092806, 1070252, 1047698, 1025144, 1002590, 980036, 957482,
934928, 912374, 889820, 867266, 844712, 822158, 799604, 777050,
754496, 731942, 709388, 686834, 664280, 641726, 619172, 596618,
574064, 551510, 528956, 506402, 483848, 461294, 438740, 416186,
393632, 371078, 348524, 325970, 303416, 280862, 258308, 235754,
213200, 190646, 168092, 145538, 122984, 100430, 77876, 55322,
32768, 10214, -12340, -34894, -57448, -80002, -102556, -125110,
-147664, -170218, -192772, -215326, -237880, -260434, -282988, -305542,
-328096, -350650, -373204, -395758, -418312, -440866, -463420, -485974,
-508528, -531082, -553636, -576190, -598744, -621298, -643852, -666406,
-688960, -711514, -734068, -756622, -779176, -801730, -824284, -846838,
-869392, -891946, -914500, -937054, -959608, -982162, -1004716, -1027270,
-1049824, -1072378, -1094932, -1117486, -1140040, -1162594, -1185148, -1207702,
-1230256, -1252810, -1275364, -1297918, -1320472, -1343026, -1365580, -1388134,
-1410688, -1433242, -1455796, -1478350, -1500904, -1523458, -1546012, -1568566,
-1591120, -1613674, -1636228, -1658782, -1681336, -1703890, -1726444, -1748998,
-1771552, -1794106, -1816660, -1839214, -1861768, -1884322, -1906876, -1929430,
-1951984, -1974538, -1997092, -2019646, -2042200, -2064754, -2087308, -2109862,
-2132416, -2154970, -2177524, -2200078, -2222632, -2245186, -2267740, -2290294,
-2312848, -2335402, -2357956, -2380510, -2403064, -2425618, -2448172, -2470726,
-2493280, -2515834, -2538388, -2560942, -2583496, -2606050, -2628604, -2651158,
-2673712, -2696266, -2718820, -2741374, -2763928, -2786482, -2809036, -2831590,
};
static const uint8_t kRangeLimitLut[4 * 256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
};
static const uint8_t* kRangeLimit = kRangeLimitLut + 384;
inline void ColorTransformYCbCrToRGB(uint8_t* pixel) {
int y = pixel[0];
int cb = pixel[1];
int cr = pixel[2];
pixel[0] = kRangeLimit[y + kCrToRedTable[cr]];
pixel[1] = kRangeLimit[y +
((kCrToGreenTable[cr] + kCbToGreenTable[cb]) >> 16)];
pixel[2] = kRangeLimit[y + kCbToBlueTable[cb]];
// At this point the color transform is complete, but for debugging purposes,
// it can be useful to look at the Y or Cr or Cb channels, because artifacts
// can be much more visible there. By setting the |cm| variable below, the
// decoder will output the given channel. Cr and Cb are multiplied by 2.
enum ColorMode { kY, kCb, kCr, kRgb } cm = kRgb;
if (cm == kY) {
pixel[0] = y;
pixel[1] = y;
pixel[2] = y;
} else if (cm == kCb) {
pixel[0] = std::max(0, std::min(255, cb * 2 - 128));
pixel[1] = std::max(0, std::min(255, cb * 2 - 128));
pixel[2] = std::max(0, std::min(255, cb * 2 - 128));
} else if (cm == kCr) {
pixel[0] = std::max(0, std::min(255, cr * 2 - 128));
pixel[1] = std::max(0, std::min(255, cr * 2 - 128));
pixel[2] = std::max(0, std::min(255, cr * 2 - 128));
}
}
} // namespace knusperli
#endif // KNUSPERLI_COLOR_TRANSFORM_H_