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1 /*
2  * Copyright 2016 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #include "SkSRGB.h"
9 
10 const float sk_linear_from_srgb[256] = {
11         0.000000000000000000f, 0.000303526983548838f, 0.000607053967097675f, 0.000910580950646513f,
12         0.001214107934195350f, 0.001517634917744190f, 0.001821161901293030f, 0.002124688884841860f,
13         0.002428215868390700f, 0.002731742851939540f, 0.003034518678424960f, 0.003346535763899160f,
14         0.003676507324047440f, 0.004024717018496310f, 0.004391442037410290f, 0.004776953480693730f,
15         0.005181516702338390f, 0.005605391624202720f, 0.006048833022857060f, 0.006512090792594470f,
16         0.006995410187265390f, 0.007499032043226180f, 0.008023192985384990f, 0.008568125618069310f,
17         0.009134058702220790f, 0.009721217320237850f, 0.010329823029626900f, 0.010960094006488200f,
18         0.011612245179743900f, 0.012286488356915900f, 0.012983032342173000f, 0.013702083047289700f,
19         0.014443843596092500f, 0.015208514422912700f, 0.015996293365509600f, 0.016807375752887400f,
20         0.017641954488384100f, 0.018500220128379700f, 0.019382360956935700f, 0.020288563056652400f,
21         0.021219010376003600f, 0.022173884793387400f, 0.023153366178110400f, 0.024157632448504800f,
22         0.025186859627361600f, 0.026241221894849900f, 0.027320891639074900f, 0.028426039504420800f,
23         0.029556834437808800f, 0.030713443732993600f, 0.031896033073011500f, 0.033104766570885100f,
24         0.034339806808682200f, 0.035601314875020300f, 0.036889450401100000f, 0.038204371595346500f,
25         0.039546235276732800f, 0.040915196906853200f, 0.042311410620809700f, 0.043735029256973500f,
26         0.045186204385675500f, 0.046665086336880100f, 0.048171824226889400f, 0.049706565984127200f,
27         0.051269458374043200f, 0.052860647023180200f, 0.054480276442442400f, 0.056128490049600100f,
28         0.057805430191067200f, 0.059511238162981200f, 0.061246054231617600f, 0.063010017653167700f,
29         0.064803266692905800f, 0.066625938643772900f, 0.068478169844400200f, 0.070360095696595900f,
30         0.072271850682317500f, 0.074213568380149600f, 0.076185381481307900f, 0.078187421805186300f,
31         0.080219820314468300f, 0.082282707129814800f, 0.084376211544148800f, 0.086500462036549800f,
32         0.088655586285772900f, 0.090841711183407700f, 0.093058962846687500f, 0.095307466630964700f,
33         0.097587347141862500f, 0.099898728247113900f, 0.102241733088101000f, 0.104616484091104000f,
34         0.107023102978268000f, 0.109461710778299000f, 0.111932427836906000f, 0.114435373826974000f,
35         0.116970667758511000f, 0.119538427988346000f, 0.122138772229602000f, 0.124771817560950000f,
36         0.127437680435647000f, 0.130136476690364000f, 0.132868321553818000f, 0.135633329655206000f,
37         0.138431615032452000f, 0.141263291140272000f, 0.144128470858058000f, 0.147027266497595000f,
38         0.149959789810609000f, 0.152926151996150000f, 0.155926463707827000f, 0.158960835060880000f,
39         0.162029375639111000f, 0.165132194501668000f, 0.168269400189691000f, 0.171441100732823000f,
40         0.174647403655585000f, 0.177888415983629000f, 0.181164244249860000f, 0.184474994500441000f,
41         0.187820772300678000f, 0.191201682740791000f, 0.194617830441576000f, 0.198069319559949000f,
42         0.201556253794397000f, 0.205078736390317000f, 0.208636870145256000f, 0.212230757414055000f,
43         0.215860500113899000f, 0.219526199729269000f, 0.223227957316809000f, 0.226965873510098000f,
44         0.230740048524349000f, 0.234550582161005000f, 0.238397573812271000f, 0.242281122465555000f,
45         0.246201326707835000f, 0.250158284729953000f, 0.254152094330827000f, 0.258182852921596000f,
46         0.262250657529696000f, 0.266355604802862000f, 0.270497791013066000f, 0.274677312060385000f,
47         0.278894263476810000f, 0.283148740429992000f, 0.287440837726918000f, 0.291770649817536000f,
48         0.296138270798321000f, 0.300543794415777000f, 0.304987314069886000f, 0.309468922817509000f,
49         0.313988713375718000f, 0.318546778125092000f, 0.323143209112951000f, 0.327778098056542000f,
50         0.332451536346179000f, 0.337163615048330000f, 0.341914424908661000f, 0.346704056355030000f,
51         0.351532599500439000f, 0.356400144145944000f, 0.361306779783510000f, 0.366252595598840000f,
52         0.371237680474149000f, 0.376262122990906000f, 0.381326011432530000f, 0.386429433787049000f,
53         0.391572477749723000f, 0.396755230725627000f, 0.401977779832196000f, 0.407240211901737000f,
54         0.412542613483904000f, 0.417885070848138000f, 0.423267669986072000f, 0.428690496613907000f,
55         0.434153636174749000f, 0.439657173840919000f, 0.445201194516228000f, 0.450785782838223000f,
56         0.456411023180405000f, 0.462076999654407000f, 0.467783796112159000f, 0.473531496148010000f,
57         0.479320183100827000f, 0.485149940056070000f, 0.491020849847836000f, 0.496932995060870000f,
58         0.502886458032569000f, 0.508881320854934000f, 0.514917665376521000f, 0.520995573204354000f,
59         0.527115125705813000f, 0.533276404010505000f, 0.539479489012107000f, 0.545724461370187000f,
60         0.552011401512000000f, 0.558340389634268000f, 0.564711505704929000f, 0.571124829464873000f,
61         0.577580440429651000f, 0.584078417891164000f, 0.590618840919337000f, 0.597201788363763000f,
62         0.603827338855338000f, 0.610495570807865000f, 0.617206562419651000f, 0.623960391675076000f,
63         0.630757136346147000f, 0.637596873994033000f, 0.644479681970582000f, 0.651405637419824000f,
64         0.658374817279448000f, 0.665387298282272000f, 0.672443156957688000f, 0.679542469633094000f,
65         0.686685312435314000f, 0.693871761291990000f, 0.701101891932973000f, 0.708375779891687000f,
66         0.715693500506481000f, 0.723055128921969000f, 0.730460740090354000f, 0.737910408772731000f,
67         0.745404209540387000f, 0.752942216776078000f, 0.760524504675292000f, 0.768151147247507000f,
68         0.775822218317423000f, 0.783537791526194000f, 0.791297940332630000f, 0.799102738014409000f,
69         0.806952257669252000f, 0.814846572216101000f, 0.822785754396284000f, 0.830769876774655000f,
70         0.838799011740740000f, 0.846873231509858000f, 0.854992608124234000f, 0.863157213454102000f,
71         0.871367119198797000f, 0.879622396887832000f, 0.887923117881966000f, 0.896269353374266000f,
72         0.904661174391149000f, 0.913098651793419000f, 0.921581856277295000f, 0.930110858375424000f,
73         0.938685728457888000f, 0.947306536733200000f, 0.955973353249286000f, 0.964686247894465000f,
74         0.973445290398413000f, 0.982250550333117000f, 0.991102097113830000f, 1.000000000000000000f,
75 };
76 
77 /*
78  * Converts sRGB encoded bytes to a 12-bit linear representation.
79  */
80 const uint16_t sk_linear12_from_srgb[256] = {
81         0, 1, 2, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15, 16, 18, 20, 21, 23, 25, 27, 29, 31, 33, 35, 37,
82         40, 42, 45, 48, 50, 53, 56, 59, 62, 66, 69, 72, 76, 79, 83, 87, 91, 95, 99, 103, 107, 112,
83         116, 121, 126, 131, 136, 141, 146, 151, 156, 162, 168, 173, 179, 185, 191, 197, 204, 210,
84         216, 223, 230, 237, 244, 251, 258, 265, 273, 280, 288, 296, 304, 312, 320, 329, 337, 346,
85         354, 363, 372, 381, 390, 400, 409, 419, 428, 438, 448, 458, 469, 479, 490, 500, 511, 522,
86         533, 544, 555, 567, 578, 590, 602, 614, 626, 639, 651, 664, 676, 689, 702, 715, 728, 742,
87         755, 769, 783, 797, 811, 825, 840, 854, 869, 884, 899, 914, 929, 945, 960, 976, 992, 1008,
88         1024, 1041, 1057, 1074, 1091, 1108, 1125, 1142, 1159, 1177, 1195, 1213, 1231, 1249, 1267,
89         1286, 1304, 1323, 1342, 1361, 1381, 1400, 1420, 1440, 1459, 1480, 1500, 1520, 1541, 1562,
90         1582, 1603, 1625, 1646, 1668, 1689, 1711, 1733, 1755, 1778, 1800, 1823, 1846, 1869, 1892,
91         1916, 1939, 1963, 1987, 2011, 2035, 2059, 2084, 2109, 2133, 2159, 2184, 2209, 2235, 2260,
92         2286, 2312, 2339, 2365, 2392, 2419, 2446, 2473, 2500, 2527, 2555, 2583, 2611, 2639, 2668,
93         2696, 2725, 2754, 2783, 2812, 2841, 2871, 2901, 2931, 2961, 2991, 3022, 3052, 3083, 3114,
94         3146, 3177, 3209, 3240, 3272, 3304, 3337, 3369, 3402, 3435, 3468, 3501, 3535, 3568, 3602,
95         3636, 3670, 3705, 3739, 3774, 3809, 3844, 3879, 3915, 3950, 3986, 4022, 4059, 4095,
96 };
97 
98 /*
99  * Converts 12-bit linear to sRGB encoded bytes.
100  */
101 const uint8_t sk_linear12_to_srgb[4096] = {
102         0, 1, 2, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 10, 11, 12, 13, 13, 14, 15, 15, 16, 16, 17, 18, 18,
103         19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 23, 24, 24, 25, 25, 25, 26, 26, 27, 27, 27, 28, 28,
104         29, 29, 29, 30, 30, 30, 31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 34, 34, 34, 35, 35, 35, 36,
105         36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 39, 39, 39, 40, 40, 40, 40, 41, 41, 41, 41, 42, 42,
106         42, 42, 43, 43, 43, 43, 43, 44, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 46, 46, 47, 47, 47,
107         47, 48, 48, 48, 48, 48, 49, 49, 49, 49, 49, 50, 50, 50, 50, 50, 51, 51, 51, 51, 51, 52, 52,
108         52, 52, 52, 53, 53, 53, 53, 53, 54, 54, 54, 54, 54, 55, 55, 55, 55, 55, 55, 56, 56, 56, 56,
109         56, 57, 57, 57, 57, 57, 57, 58, 58, 58, 58, 58, 58, 59, 59, 59, 59, 59, 59, 60, 60, 60, 60,
110         60, 60, 61, 61, 61, 61, 61, 61, 62, 62, 62, 62, 62, 62, 63, 63, 63, 63, 63, 63, 64, 64, 64,
111         64, 64, 64, 64, 65, 65, 65, 65, 65, 65, 66, 66, 66, 66, 66, 66, 66, 67, 67, 67, 67, 67, 67,
112         67, 68, 68, 68, 68, 68, 68, 68, 69, 69, 69, 69, 69, 69, 69, 70, 70, 70, 70, 70, 70, 70, 71,
113         71, 71, 71, 71, 71, 71, 72, 72, 72, 72, 72, 72, 72, 72, 73, 73, 73, 73, 73, 73, 73, 74, 74,
114         74, 74, 74, 74, 74, 74, 75, 75, 75, 75, 75, 75, 75, 75, 76, 76, 76, 76, 76, 76, 76, 77, 77,
115         77, 77, 77, 77, 77, 77, 78, 78, 78, 78, 78, 78, 78, 78, 78, 79, 79, 79, 79, 79, 79, 79, 79,
116         80, 80, 80, 80, 80, 80, 80, 80, 81, 81, 81, 81, 81, 81, 81, 81, 81, 82, 82, 82, 82, 82, 82,
117         82, 82, 83, 83, 83, 83, 83, 83, 83, 83, 83, 84, 84, 84, 84, 84, 84, 84, 84, 84, 85, 85, 85,
118         85, 85, 85, 85, 85, 85, 86, 86, 86, 86, 86, 86, 86, 86, 86, 87, 87, 87, 87, 87, 87, 87, 87,
119         87, 88, 88, 88, 88, 88, 88, 88, 88, 88, 88, 89, 89, 89, 89, 89, 89, 89, 89, 89, 90, 90, 90,
120         90, 90, 90, 90, 90, 90, 90, 91, 91, 91, 91, 91, 91, 91, 91, 91, 91, 92, 92, 92, 92, 92, 92,
121         92, 92, 92, 92, 93, 93, 93, 93, 93, 93, 93, 93, 93, 93, 94, 94, 94, 94, 94, 94, 94, 94, 94,
122         94, 95, 95, 95, 95, 95, 95, 95, 95, 95, 95, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 97,
123         97, 97, 97, 97, 97, 97, 97, 97, 97, 98, 98, 98, 98, 98, 98, 98, 98, 98, 98, 98, 99, 99, 99,
124         99, 99, 99, 99, 99, 99, 99, 99, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 100, 101,
125         101, 101, 101, 101, 101, 101, 101, 101, 101, 101, 102, 102, 102, 102, 102, 102, 102, 102,
126         102, 102, 102, 103, 103, 103, 103, 103, 103, 103, 103, 103, 103, 103, 103, 104, 104, 104,
127         104, 104, 104, 104, 104, 104, 104, 104, 105, 105, 105, 105, 105, 105, 105, 105, 105, 105,
128         105, 105, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 106, 107, 107, 107, 107,
129         107, 107, 107, 107, 107, 107, 107, 107, 108, 108, 108, 108, 108, 108, 108, 108, 108, 108,
130         108, 108, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 109, 110, 110, 110, 110,
131         110, 110, 110, 110, 110, 110, 110, 110, 111, 111, 111, 111, 111, 111, 111, 111, 111, 111,
132         111, 111, 111, 112, 112, 112, 112, 112, 112, 112, 112, 112, 112, 112, 112, 113, 113, 113,
133         113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 114, 114, 114, 114, 114, 114, 114, 114,
134         114, 114, 114, 114, 114, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115, 115,
135         116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 116, 117, 117, 117, 117, 117,
136         117, 117, 117, 117, 117, 117, 117, 117, 117, 118, 118, 118, 118, 118, 118, 118, 118, 118,
137         118, 118, 118, 118, 119, 119, 119, 119, 119, 119, 119, 119, 119, 119, 119, 119, 119, 119,
138         120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 120, 121, 121, 121, 121,
139         121, 121, 121, 121, 121, 121, 121, 121, 121, 122, 122, 122, 122, 122, 122, 122, 122, 122,
140         122, 122, 122, 122, 122, 122, 123, 123, 123, 123, 123, 123, 123, 123, 123, 123, 123, 123,
141         123, 123, 124, 124, 124, 124, 124, 124, 124, 124, 124, 124, 124, 124, 124, 124, 125, 125,
142         125, 125, 125, 125, 125, 125, 125, 125, 125, 125, 125, 125, 125, 126, 126, 126, 126, 126,
143         126, 126, 126, 126, 126, 126, 126, 126, 126, 127, 127, 127, 127, 127, 127, 127, 127, 127,
144         127, 127, 127, 127, 127, 127, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128,
145         128, 128, 128, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129, 129,
146         130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 130, 131, 131, 131,
147         131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 131, 132, 132, 132, 132, 132,
148         132, 132, 132, 132, 132, 132, 132, 132, 132, 132, 133, 133, 133, 133, 133, 133, 133, 133,
149         133, 133, 133, 133, 133, 133, 133, 133, 134, 134, 134, 134, 134, 134, 134, 134, 134, 134,
150         134, 134, 134, 134, 134, 134, 135, 135, 135, 135, 135, 135, 135, 135, 135, 135, 135, 135,
151         135, 135, 135, 135, 136, 136, 136, 136, 136, 136, 136, 136, 136, 136, 136, 136, 136, 136,
152         136, 136, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137, 137,
153         138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 139, 139,
154         139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 140, 140, 140,
155         140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 140, 141, 141, 141, 141,
156         141, 141, 141, 141, 141, 141, 141, 141, 141, 141, 141, 141, 141, 142, 142, 142, 142, 142,
157         142, 142, 142, 142, 142, 142, 142, 142, 142, 142, 142, 142, 143, 143, 143, 143, 143, 143,
158         143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 143, 144, 144, 144, 144, 144, 144, 144,
159         144, 144, 144, 144, 144, 144, 144, 144, 144, 144, 145, 145, 145, 145, 145, 145, 145, 145,
160         145, 145, 145, 145, 145, 145, 145, 145, 145, 145, 146, 146, 146, 146, 146, 146, 146, 146,
161         146, 146, 146, 146, 146, 146, 146, 146, 146, 147, 147, 147, 147, 147, 147, 147, 147, 147,
162         147, 147, 147, 147, 147, 147, 147, 147, 147, 148, 148, 148, 148, 148, 148, 148, 148, 148,
163         148, 148, 148, 148, 148, 148, 148, 148, 148, 149, 149, 149, 149, 149, 149, 149, 149, 149,
164         149, 149, 149, 149, 149, 149, 149, 149, 149, 150, 150, 150, 150, 150, 150, 150, 150, 150,
165         150, 150, 150, 150, 150, 150, 150, 150, 150, 150, 151, 151, 151, 151, 151, 151, 151, 151,
166         151, 151, 151, 151, 151, 151, 151, 151, 151, 151, 152, 152, 152, 152, 152, 152, 152, 152,
167         152, 152, 152, 152, 152, 152, 152, 152, 152, 152, 152, 153, 153, 153, 153, 153, 153, 153,
168         153, 153, 153, 153, 153, 153, 153, 153, 153, 153, 153, 154, 154, 154, 154, 154, 154, 154,
169         154, 154, 154, 154, 154, 154, 154, 154, 154, 154, 154, 154, 155, 155, 155, 155, 155, 155,
170         155, 155, 155, 155, 155, 155, 155, 155, 155, 155, 155, 155, 155, 156, 156, 156, 156, 156,
171         156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 156, 157, 157, 157,
172         157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 157, 158, 158,
173         158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 158, 159,
174         159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159, 159,
175         159, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160, 160,
176         160, 160, 160, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161, 161,
177         161, 161, 161, 161, 161, 162, 162, 162, 162, 162, 162, 162, 162, 162, 162, 162, 162, 162,
178         162, 162, 162, 162, 162, 162, 162, 163, 163, 163, 163, 163, 163, 163, 163, 163, 163, 163,
179         163, 163, 163, 163, 163, 163, 163, 163, 163, 164, 164, 164, 164, 164, 164, 164, 164, 164,
180         164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 164, 165, 165, 165, 165, 165, 165,
181         165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 165, 166, 166, 166,
182         166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 166, 167,
183         167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167, 167,
184         167, 167, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168, 168,
185         168, 168, 168, 168, 168, 168, 169, 169, 169, 169, 169, 169, 169, 169, 169, 169, 169, 169,
186         169, 169, 169, 169, 169, 169, 169, 169, 169, 170, 170, 170, 170, 170, 170, 170, 170, 170,
187         170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 170, 171, 171, 171, 171, 171, 171,
188         171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 172, 172,
189         172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172, 172,
190         172, 172, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173, 173,
191         173, 173, 173, 173, 173, 173, 174, 174, 174, 174, 174, 174, 174, 174, 174, 174, 174, 174,
192         174, 174, 174, 174, 174, 174, 174, 174, 174, 174, 175, 175, 175, 175, 175, 175, 175, 175,
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323         255, 255, 255,
324 };
325