// Copyright 2015 Google Inc. All Rights Reserved.

//

// Use of this source code is governed by a BSD-style license

// that can be found in the COPYING file in the root of the source

// tree. An additional intellectual property rights grant can be found

// in the file PATENTS. All contributing project authors may

// be found in the AUTHORS file in the root of the source tree.

// -----------------------------------------------------------------------------

//

// Image transform methods for lossless encoder.

//

// Authors: Vikas Arora (vikaas.arora@gmail.com)

// Jyrki Alakuijala (jyrki@google.com)

// Urvang Joshi (urvang@google.com)

#include "src/dsp/dsp.h"

#include <assert.h>

#include <math.h>

#include <stdlib.h>

#include "src/dec/vp8li_dec.h"

#include "src/utils/endian_inl_utils.h"

#include "src/dsp/lossless.h"

#include "src/dsp/lossless_common.h"

#include "src/dsp/yuv.h"

// lookup table for small values of log2(int)

const float kLog2Table[LOG_LOOKUP_IDX_MAX] = {

0.0000000000000000f, 0.0000000000000000f,

1.0000000000000000f, 1.5849625007211560f,

2.0000000000000000f, 2.3219280948873621f,

2.5849625007211560f, 2.8073549220576041f,

3.0000000000000000f, 3.1699250014423121f,

3.3219280948873621f, 3.4594316186372973f,

3.5849625007211560f, 3.7004397181410921f,

3.8073549220576041f, 3.9068905956085187f,

4.0000000000000000f, 4.0874628412503390f,

4.1699250014423121f, 4.2479275134435852f,

4.3219280948873626f, 4.3923174227787606f,

4.4594316186372973f, 4.5235619560570130f,

4.5849625007211560f, 4.6438561897747243f,

4.7004397181410917f, 4.7548875021634682f,

4.8073549220576037f, 4.8579809951275718f,

4.9068905956085187f, 4.9541963103868749f,

5.0000000000000000f, 5.0443941193584533f,

5.0874628412503390f, 5.1292830169449663f,

5.1699250014423121f, 5.2094533656289501f,

5.2479275134435852f, 5.2854022188622487f,

5.3219280948873626f, 5.3575520046180837f,

5.3923174227787606f, 5.4262647547020979f,

5.4594316186372973f, 5.4918530963296747f,

5.5235619560570130f, 5.5545888516776376f,

5.5849625007211560f, 5.6147098441152083f,

5.6438561897747243f, 5.6724253419714951f,

5.7004397181410917f, 5.7279204545631987f,

5.7548875021634682f, 5.7813597135246599f,

5.8073549220576037f, 5.8328900141647412f,

5.8579809951275718f, 5.8826430493618415f,

5.9068905956085187f, 5.9307373375628866f,

5.9541963103868749f, 5.9772799234999167f,

6.0000000000000000f, 6.0223678130284543f,

6.0443941193584533f, 6.0660891904577720f,

6.0874628412503390f, 6.1085244567781691f,

6.1292830169449663f, 6.1497471195046822f,

6.1699250014423121f, 6.1898245588800175f,

6.2094533656289501f, 6.2288186904958804f,

6.2479275134435852f, 6.2667865406949010f,

6.2854022188622487f, 6.3037807481771030f,

6.3219280948873626f, 6.3398500028846243f,

6.3575520046180837f, 6.3750394313469245f,

6.3923174227787606f, 6.4093909361377017f,

6.4262647547020979f, 6.4429434958487279f,

6.4594316186372973f, 6.4757334309663976f,

6.4918530963296747f, 6.5077946401986963f,

6.5235619560570130f, 6.5391588111080309f,

6.5545888516776376f, 6.5698556083309478f,

6.5849625007211560f, 6.5999128421871278f,

6.6147098441152083f, 6.6293566200796094f,

6.6438561897747243f, 6.6582114827517946f,

6.6724253419714951f, 6.6865005271832185f,

6.7004397181410917f, 6.7142455176661224f,

6.7279204545631987f, 6.7414669864011464f,

6.7548875021634682f, 6.7681843247769259f,

6.7813597135246599f, 6.7944158663501061f,

6.8073549220576037f, 6.8201789624151878f,

6.8328900141647412f, 6.8454900509443747f,

6.8579809951275718f, 6.8703647195834047f,

6.8826430493618415f, 6.8948177633079437f,

6.9068905956085187f, 6.9188632372745946f,

6.9307373375628866f, 6.9425145053392398f,

6.9541963103868749f, 6.9657842846620869f,

6.9772799234999167f, 6.9886846867721654f,

7.0000000000000000f, 7.0112272554232539f,

7.0223678130284543f, 7.0334230015374501f,

7.0443941193584533f, 7.0552824355011898f,

7.0660891904577720f, 7.0768155970508308f,

7.0874628412503390f, 7.0980320829605263f,

7.1085244567781691f, 7.1189410727235076f,

7.1292830169449663f, 7.1395513523987936f,

7.1497471195046822f, 7.1598713367783890f,

7.1699250014423121f, 7.1799090900149344f,

7.1898245588800175f, 7.1996723448363644f,

7.2094533656289501f, 7.2191685204621611f,

7.2288186904958804f, 7.2384047393250785f,

7.2479275134435852f, 7.2573878426926521f,

7.2667865406949010f, 7.2761244052742375f,

7.2854022188622487f, 7.2946207488916270f,

7.3037807481771030f, 7.3128829552843557f,

7.3219280948873626f, 7.3309168781146167f,

7.3398500028846243f, 7.3487281542310771f,

7.3575520046180837f, 7.3663222142458160f,

7.3750394313469245f, 7.3837042924740519f,

7.3923174227787606f, 7.4008794362821843f,

7.4093909361377017f, 7.4178525148858982f,

7.4262647547020979f, 7.4346282276367245f,

7.4429434958487279f, 7.4512111118323289f,

7.4594316186372973f, 7.4676055500829976f,

7.4757334309663976f, 7.4838157772642563f,

7.4918530963296747f, 7.4998458870832056f,

7.5077946401986963f, 7.5156998382840427f,

7.5235619560570130f, 7.5313814605163118f,

7.5391588111080309f, 7.5468944598876364f,

7.5545888516776376f, 7.5622424242210728f,

7.5698556083309478f, 7.5774288280357486f,

7.5849625007211560f, 7.5924570372680806f,

7.5999128421871278f, 7.6073303137496104f,

7.6147098441152083f, 7.6220518194563764f,

7.6293566200796094f, 7.6366246205436487f,

7.6438561897747243f, 7.6510516911789281f,

7.6582114827517946f, 7.6653359171851764f,

7.6724253419714951f, 7.6794800995054464f,

7.6865005271832185f, 7.6934869574993252f,

7.7004397181410917f, 7.7073591320808825f,

7.7142455176661224f, 7.7210991887071855f,

7.7279204545631987f, 7.7347096202258383f,

7.7414669864011464f, 7.7481928495894605f,

7.7548875021634682f, 7.7615512324444795f,

7.7681843247769259f, 7.7747870596011736f,

7.7813597135246599f, 7.7879025593914317f,

7.7944158663501061f, 7.8008998999203047f,

7.8073549220576037f, 7.8137811912170374f,

7.8201789624151878f, 7.8265484872909150f,

7.8328900141647412f, 7.8392037880969436f,

7.8454900509443747f, 7.8517490414160571f,

7.8579809951275718f, 7.8641861446542797f,

7.8703647195834047f, 7.8765169465649993f,

7.8826430493618415f, 7.8887432488982591f,

7.8948177633079437f, 7.9008668079807486f,

7.9068905956085187f, 7.9128893362299619f,

7.9188632372745946f, 7.9248125036057812f,

7.9307373375628866f, 7.9366379390025709f,

7.9425145053392398f, 7.9483672315846778f,

7.9541963103868749f, 7.9600019320680805f,

7.9657842846620869f, 7.9715435539507719f,

7.9772799234999167f, 7.9829935746943103f,

7.9886846867721654f, 7.9943534368588577f

};

const float kSLog2Table[LOG_LOOKUP_IDX_MAX] = {

0.00000000f, 0.00000000f, 2.00000000f, 4.75488750f,

8.00000000f, 11.60964047f, 15.50977500f, 19.65148445f,

24.00000000f, 28.52932501f, 33.21928095f, 38.05374781f,

43.01955001f, 48.10571634f, 53.30296891f, 58.60335893f,

64.00000000f, 69.48686830f, 75.05865003f, 80.71062276f,

86.43856190f, 92.23866588f, 98.10749561f, 104.04192499f,

110.03910002f, 116.09640474f, 122.21143267f, 128.38196256f,

134.60593782f, 140.88144886f, 147.20671787f, 153.58008562f,

160.00000000f, 166.46500594f, 172.97373660f, 179.52490559f,

186.11730005f, 192.74977453f, 199.42124551f, 206.13068654f,

212.87712380f, 219.65963219f, 226.47733176f, 233.32938445f,

240.21499122f, 247.13338933f, 254.08384998f, 261.06567603f,

268.07820003f, 275.12078236f, 282.19280949f, 289.29369244f,

296.42286534f, 303.57978409f, 310.76392512f, 317.97478424f,

325.21187564f, 332.47473081f, 339.76289772f, 347.07593991f,

354.41343574f, 361.77497759f, 369.16017124f, 376.56863518f,

384.00000000f, 391.45390785f, 398.93001188f, 406.42797576f,

413.94747321f, 421.48818752f, 429.04981119f, 436.63204548f,

444.23460010f, 451.85719280f, 459.49954906f, 467.16140179f,

474.84249102f, 482.54256363f, 490.26137307f, 497.99867911f,

505.75424759f, 513.52785023f, 521.31926438f, 529.12827280f,

536.95466351f, 544.79822957f, 552.65876890f, 560.53608414f,

568.42998244f, 576.34027536f, 584.26677867f, 592.20931226f,

600.16769996f, 608.14176943f, 616.13135206f, 624.13628279f,

632.15640007f, 640.19154569f, 648.24156472f, 656.30630539f,

664.38561898f, 672.47935976f, 680.58738488f, 688.70955430f,

696.84573069f, 704.99577935f, 713.15956818f, 721.33696754f,

729.52785023f, 737.73209140f, 745.94956849f, 754.18016116f,

762.42375127f, 770.68022275f, 778.94946161f, 787.23135586f,

795.52579543f, 803.83267219f, 812.15187982f, 820.48331383f,

828.82687147f, 837.18245171f, 845.54995518f, 853.92928416f,

862.32034249f, 870.72303558f, 879.13727036f, 887.56295522f,

896.00000000f, 904.44831595f, 912.90781569f, 921.37841320f,

929.86002376f, 938.35256392f, 946.85595152f, 955.37010560f,

963.89494641f, 972.43039537f, 980.97637504f, 989.53280911f,

998.09962237f, 1006.67674069f, 1015.26409097f, 1023.86160116f,

1032.46920021f, 1041.08681805f, 1049.71438560f, 1058.35183469f,

1066.99909811f, 1075.65610955f, 1084.32280357f, 1092.99911564f,

1101.68498204f, 1110.38033993f, 1119.08512727f, 1127.79928282f,

1136.52274614f, 1145.25545758f, 1153.99735821f, 1162.74838989f,

1171.50849518f, 1180.27761738f, 1189.05570047f, 1197.84268914f,

1206.63852876f, 1215.44316535f, 1224.25654560f, 1233.07861684f,

1241.90932703f, 1250.74862473f, 1259.59645914f, 1268.45278005f,

1277.31753781f, 1286.19068338f, 1295.07216828f, 1303.96194457f,

1312.85996488f, 1321.76618236f, 1330.68055071f, 1339.60302413f,

1348.53355734f, 1357.47210556f, 1366.41862452f, 1375.37307041f,

1384.33539991f, 1393.30557020f, 1402.28353887f, 1411.26926400f,

1420.26270412f, 1429.26381818f, 1438.27256558f, 1447.28890615f,

1456.31280014f, 1465.34420819f, 1474.38309138f, 1483.42941118f,

1492.48312945f, 1501.54420843f, 1510.61261078f, 1519.68829949f,

1528.77123795f, 1537.86138993f, 1546.95871952f, 1556.06319119f,

1565.17476976f, 1574.29342040f, 1583.41910860f, 1592.55180020f,

1601.69146137f, 1610.83805860f, 1619.99155871f, 1629.15192882f,

1638.31913637f, 1647.49314911f, 1656.67393509f, 1665.86146266f,

1675.05570047f, 1684.25661744f, 1693.46418280f, 1702.67836605f,

1711.89913698f, 1721.12646563f, 1730.36032233f, 1739.60067768f,

1748.84750254f, 1758.10076802f, 1767.36044551f, 1776.62650662f,

1785.89892323f, 1795.17766747f, 1804.46271172f, 1813.75402857f,

1823.05159087f, 1832.35537170f, 1841.66534438f, 1850.98148244f,

1860.30375965f, 1869.63214999f, 1878.96662767f, 1888.30716711f,

1897.65374295f, 1907.00633003f, 1916.36490342f, 1925.72943838f,

1935.09991037f, 1944.47629506f, 1953.85856831f, 1963.24670620f,

1972.64068498f, 1982.04048108f, 1991.44607117f, 2000.85743204f,

2010.27454072f, 2019.69737440f, 2029.12591044f, 2038.56012640f

};

const VP8LPrefixCode kPrefixEncodeCode[PREFIX_LOOKUP_IDX_MAX] = {

{ 0, 0}, { 0, 0}, { 1, 0}, { 2, 0}, { 3, 0}, { 4, 1}, { 4, 1}, { 5, 1},

{ 5, 1}, { 6, 2}, { 6, 2}, { 6, 2}, { 6, 2}, { 7, 2}, { 7, 2}, { 7, 2},

{ 7, 2}, { 8, 3}, { 8, 3}, { 8, 3}, { 8, 3}, { 8, 3}, { 8, 3}, { 8, 3},

{ 8, 3}, { 9, 3}, { 9, 3}, { 9, 3}, { 9, 3}, { 9, 3}, { 9, 3}, { 9, 3},

{ 9, 3}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4},

{10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4}, {10, 4},

{10, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4},

{11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4}, {11, 4},

{11, 4}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},

{12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},

{12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},

{12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5}, {12, 5},

{12, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5},

{13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5},

{13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5},

{13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5}, {13, 5},

{13, 5}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6}, {14, 6},

{14, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6}, {15, 6},

{15, 6}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7}, {16, 7},

{16, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

{17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7}, {17, 7},

};

const uint8_t kPrefixEncodeExtraBitsValue[PREFIX_LOOKUP_IDX_MAX] = {

0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 2, 3, 0, 1, 2, 3,

0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 2, 3, 4, 5, 6, 7,

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,

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,

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,

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,

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,

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,

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

};

static float FastSLog2Slow_C(uint32_t v) {

assert(v >= LOG_LOOKUP_IDX_MAX);

if (v < APPROX_LOG_WITH_CORRECTION_MAX) {

int log_cnt = 0;

uint32_t y = 1;

int correction = 0;

const float v_f = (float)v;

const uint32_t orig_v = v;

do {

++log_cnt;

v = v >> 1;

y = y << 1;

} while (v >= LOG_LOOKUP_IDX_MAX);

// vf = (2^log_cnt) * Xf; where y = 2^log_cnt and Xf < 256

// Xf = floor(Xf) * (1 + (v % y) / v)

// log2(Xf) = log2(floor(Xf)) + log2(1 + (v % y) / v)

// The correction factor: log(1 + d) ~ d; for very small d values, so

// log2(1 + (v % y) / v) ~ LOG_2_RECIPROCAL * (v % y)/v

// LOG_2_RECIPROCAL ~ 23/16

correction = (23 * (orig_v & (y - 1))) >> 4;

return v_f * (kLog2Table[v] + log_cnt) + correction;

} else {

return (float)(LOG_2_RECIPROCAL * v * log((double)v));

}

}

static float FastLog2Slow_C(uint32_t v) {

assert(v >= LOG_LOOKUP_IDX_MAX);

if (v < APPROX_LOG_WITH_CORRECTION_MAX) {

int log_cnt = 0;

uint32_t y = 1;

const uint32_t orig_v = v;

double log_2;

do {

++log_cnt;

v = v >> 1;

y = y << 1;

} while (v >= LOG_LOOKUP_IDX_MAX);

log_2 = kLog2Table[v] + log_cnt;

if (orig_v >= APPROX_LOG_MAX) {

// Since the division is still expensive, add this correction factor only

// for large values of 'v'.

const int correction = (23 * (orig_v & (y - 1))) >> 4;

log_2 += (double)correction / orig_v;

}

return (float)log_2;

} else {

return (float)(LOG_2_RECIPROCAL * log((double)v));

}

}

//------------------------------------------------------------------------------

// Methods to calculate Entropy (Shannon).

// Compute the combined Shanon's entropy for distribution {X} and {X+Y}

static float CombinedShannonEntropy_C(const int X[256], const int Y[256]) {

int i;

double retval = 0.;

int sumX = 0, sumXY = 0;

for (i = 0; i < 256; ++i) {

const int x = X[i];

if (x != 0) {

const int xy = x + Y[i];

sumX += x;

retval -= VP8LFastSLog2(x);

sumXY += xy;

retval -= VP8LFastSLog2(xy);

} else if (Y[i] != 0) {

sumXY += Y[i];

retval -= VP8LFastSLog2(Y[i]);

}

}

retval += VP8LFastSLog2(sumX) + VP8LFastSLog2(sumXY);

return (float)retval;

}

void VP8LBitEntropyInit(VP8LBitEntropy* const entropy) {

entropy->entropy = 0.;

entropy->sum = 0;

entropy->nonzeros = 0;

entropy->max_val = 0;

entropy->nonzero_code = VP8L_NON_TRIVIAL_SYM;

}

void VP8LBitsEntropyUnrefined(const uint32_t* const array, int n,

VP8LBitEntropy* const entropy) {

int i;

VP8LBitEntropyInit(entropy);

for (i = 0; i < n; ++i) {

if (array[i] != 0) {

entropy->sum += array[i];

entropy->nonzero_code = i;

++entropy->nonzeros;

entropy->entropy -= VP8LFastSLog2(array[i]);

if (entropy->max_val < array[i]) {

entropy->max_val = array[i];

}

}

}

entropy->entropy += VP8LFastSLog2(entropy->sum);

}

static WEBP_INLINE void GetEntropyUnrefinedHelper(

uint32_t val, int i, uint32_t* const val_prev, int* const i_prev,

VP8LBitEntropy* const bit_entropy, VP8LStreaks* const stats) {

const int streak = i - *i_prev;

// Gather info for the bit entropy.

if (*val_prev != 0) {

bit_entropy->sum += (*val_prev) * streak;

bit_entropy->nonzeros += streak;

bit_entropy->nonzero_code = *i_prev;

bit_entropy->entropy -= VP8LFastSLog2(*val_prev) * streak;

if (bit_entropy->max_val < *val_prev) {

bit_entropy->max_val = *val_prev;

}

}

// Gather info for the Huffman cost.

stats->counts[*val_prev != 0] += (streak > 3);

stats->streaks[*val_prev != 0][(streak > 3)] += streak;

*val_prev = val;

*i_prev = i;

}

static void GetEntropyUnrefined_C(const uint32_t X[], int length,

VP8LBitEntropy* const bit_entropy,

VP8LStreaks* const stats) {

int i;

int i_prev = 0;

uint32_t x_prev = X[0];

memset(stats, 0, sizeof(*stats));

VP8LBitEntropyInit(bit_entropy);

for (i = 1; i < length; ++i) {

const uint32_t x = X[i];

if (x != x_prev) {

GetEntropyUnrefinedHelper(x, i, &x_prev, &i_prev, bit_entropy, stats);

}

}

GetEntropyUnrefinedHelper(0, i, &x_prev, &i_prev, bit_entropy, stats);

bit_entropy->entropy += VP8LFastSLog2(bit_entropy->sum);

}

static void GetCombinedEntropyUnrefined_C(const uint32_t X[],

VP8LStreaks* const stats) {

int i = 1;

int i_prev = 0;

uint32_t xy_prev = X[0] + Y[0];

memset(stats, 0, sizeof(*stats));

VP8LBitEntropyInit(bit_entropy);

for (i = 1; i < length; ++i) {

const uint32_t xy = X[i] + Y[i];

if (xy != xy_prev) {

GetEntropyUnrefinedHelper(xy, i, &xy_prev, &i_prev, bit_entropy, stats);

}

}

GetEntropyUnrefinedHelper(0, i, &xy_prev, &i_prev, bit_entropy, stats);

bit_entropy->entropy += VP8LFastSLog2(bit_entropy->sum);

}

//------------------------------------------------------------------------------

void VP8LSubtractGreenFromBlueAndRed_C(uint32_t* argb_data, int num_pixels) {

int i;

for (i = 0; i < num_pixels; ++i) {

const int argb = argb_data[i];

const int green = (argb >> 8) & 0xff;

const uint32_t new_r = (((argb >> 16) & 0xff) - green) & 0xff;

const uint32_t new_b = (((argb >> 0) & 0xff) - green) & 0xff;

argb_data[i] = (argb & 0xff00ff00u) | (new_r << 16) | new_b;

}

}

static WEBP_INLINE int ColorTransformDelta(int8_t color_pred, int8_t color) {

return ((int)color_pred * color) >> 5;

}

static WEBP_INLINE int8_t U32ToS8(uint32_t v) {

return (int8_t)(v & 0xff);

}

void VP8LTransformColor_C(const VP8LMultipliers* const m, uint32_t* data,

int num_pixels) {

int i;

for (i = 0; i < num_pixels; ++i) {

const uint32_t argb = data[i];

const int8_t green = U32ToS8(argb >> 8);

const int8_t red = U32ToS8(argb >> 16);

int new_red = red & 0xff;

int new_blue = argb & 0xff;

new_red -= ColorTransformDelta(m->green_to_red_, green);

new_red &= 0xff;

new_blue -= ColorTransformDelta(m->green_to_blue_, green);

new_blue -= ColorTransformDelta(m->red_to_blue_, red);

new_blue &= 0xff;

data[i] = (argb & 0xff00ff00u) | (new_red << 16) | (new_blue);

}

}

static WEBP_INLINE uint8_t TransformColorRed(uint8_t green_to_red,

uint32_t argb) {

const int8_t green = U32ToS8(argb >> 8);

int new_red = argb >> 16;

new_red -= ColorTransformDelta(green_to_red, green);

return (new_red & 0xff);

}

static WEBP_INLINE uint8_t TransformColorBlue(uint8_t green_to_blue,

uint8_t red_to_blue,

uint32_t argb) {

const int8_t green = U32ToS8(argb >> 8);

const int8_t red = U32ToS8(argb >> 16);

uint8_t new_blue = argb & 0xff;

new_blue -= ColorTransformDelta(green_to_blue, green);

new_blue -= ColorTransformDelta(red_to_blue, red);

return (new_blue & 0xff);

}

void VP8LCollectColorRedTransforms_C(const uint32_t* argb, int stride,

int tile_width, int tile_height,

int green_to_red, int histo[]) {

while (tile_height-- > 0) {

int x;

for (x = 0; x < tile_width; ++x) {

++histo[TransformColorRed((uint8_t)green_to_red, argb[x])];

}

argb += stride;

}

}

void VP8LCollectColorBlueTransforms_C(const uint32_t* argb, int stride,

int tile_width, int tile_height,

int green_to_blue, int red_to_blue,

int histo[]) {

while (tile_height-- > 0) {

int x;

for (x = 0; x < tile_width; ++x) {

++histo[TransformColorBlue((uint8_t)green_to_blue, (uint8_t)red_to_blue,

argb[x])];

}

argb += stride;

}

}

//------------------------------------------------------------------------------

static int VectorMismatch_C(const uint32_t* const array1,

const uint32_t* const array2, int length) {

int match_len = 0;

while (match_len < length && array1[match_len] == array2[match_len]) {

++match_len;

}

return match_len;

}

// Bundles multiple (1, 2, 4 or 8) pixels into a single pixel.

void VP8LBundleColorMap_C(const uint8_t* const row, int width, int xbits,

uint32_t* dst) {

int x;

if (xbits > 0) {

const int bit_depth = 1 << (3 - xbits);

const int mask = (1 << xbits) - 1;

uint32_t code = 0xff000000;

for (x = 0; x < width; ++x) {

const int xsub = x & mask;

if (xsub == 0) {

code = 0xff000000;

}

code |= row[x] << (8 + bit_depth * xsub);

dst[x >> xbits] = code;

}

} else {

for (x = 0; x < width; ++x) dst[x] = 0xff000000 | (row[x] << 8);

}

}

//------------------------------------------------------------------------------

static double ExtraCost_C(const uint32_t* population, int length) {

int i;

double cost = 0.;

for (i = 2; i < length - 2; ++i) cost += (i >> 1) * population[i + 2];

return cost;

}

static double ExtraCostCombined_C(const uint32_t* X, const uint32_t* Y,

int length) {

int i;

double cost = 0.;

for (i = 2; i < length - 2; ++i) {

const int xy = X[i + 2] + Y[i + 2];

cost += (i >> 1) * xy;

}

return cost;

}

//------------------------------------------------------------------------------

static void AddVector_C(const uint32_t* a, const uint32_t* b, uint32_t* out,

int size) {

int i;

for (i = 0; i < size; ++i) out[i] = a[i] + b[i];

}

static void AddVectorEq_C(const uint32_t* a, uint32_t* out, int size) {

int i;

for (i = 0; i < size; ++i) out[i] += a[i];

}

#define ADD(X, ARG, LEN) do { \

if (a->is_used_[X]) { \

if (b->is_used_[X]) { \

VP8LAddVector(a->ARG, b->ARG, out->ARG, (LEN)); \

} else { \

memcpy(&out->ARG[0], &a->ARG[0], (LEN) * sizeof(out->ARG[0])); \

} \

} else if (b->is_used_[X]) { \

memcpy(&out->ARG[0], &b->ARG[0], (LEN) * sizeof(out->ARG[0])); \

} else { \

memset(&out->ARG[0], 0, (LEN) * sizeof(out->ARG[0])); \

} \

} while (0)

#define ADD_EQ(X, ARG, LEN) do { \

if (a->is_used_[X]) { \

if (out->is_used_[X]) { \

VP8LAddVectorEq(a->ARG, out->ARG, (LEN)); \

} else { \

memcpy(&out->ARG[0], &a->ARG[0], (LEN) * sizeof(out->ARG[0])); \

} \

} \

} while (0)

void VP8LHistogramAdd(const VP8LHistogram* const a,

const VP8LHistogram* const b, VP8LHistogram* const out) {

int i;

const int literal_size = VP8LHistogramNumCodes(a->palette_code_bits_);

assert(a->palette_code_bits_ == b->palette_code_bits_);

if (b != out) {

ADD(0, literal_, literal_size);

ADD(1, red_, NUM_LITERAL_CODES);

ADD(2, blue_, NUM_LITERAL_CODES);

ADD(3, alpha_, NUM_LITERAL_CODES);

ADD(4, distance_, NUM_DISTANCE_CODES);

for (i = 0; i < 5; ++i) {

out->is_used_[i] = (a->is_used_[i] | b->is_used_[i]);

}

} else {

ADD_EQ(0, literal_, literal_size);

ADD_EQ(1, red_, NUM_LITERAL_CODES);

ADD_EQ(2, blue_, NUM_LITERAL_CODES);

ADD_EQ(3, alpha_, NUM_LITERAL_CODES);

ADD_EQ(4, distance_, NUM_DISTANCE_CODES);

for (i = 0; i < 5; ++i) out->is_used_[i] |= a->is_used_[i];

}

}

#undef ADD

#undef ADD_EQ

//------------------------------------------------------------------------------

// Image transforms.

static WEBP_INLINE uint32_t Average2(uint32_t a0, uint32_t a1) {

return (((a0 ^ a1) & 0xfefefefeu) >> 1) + (a0 & a1);

}

static WEBP_INLINE uint32_t Average3(uint32_t a0, uint32_t a1, uint32_t a2) {

return Average2(Average2(a0, a2), a1);

}

static WEBP_INLINE uint32_t Average4(uint32_t a0, uint32_t a1,

uint32_t a2, uint32_t a3) {

return Average2(Average2(a0, a1), Average2(a2, a3));

}

static WEBP_INLINE uint32_t Clip255(uint32_t a) {

if (a < 256) {

return a;

}

// return 0, when a is a negative integer.

// return 255, when a is positive.

return ~a >> 24;

}

static WEBP_INLINE int AddSubtractComponentFull(int a, int b, int c) {

return Clip255(a + b - c);

}

static WEBP_INLINE uint32_t ClampedAddSubtractFull(uint32_t c0, uint32_t c1,

uint32_t c2) {

const int a = AddSubtractComponentFull(c0 >> 24, c1 >> 24, c2 >> 24);

const int r = AddSubtractComponentFull((c0 >> 16) & 0xff,

(c1 >> 16) & 0xff,

(c2 >> 16) & 0xff);

const int g = AddSubtractComponentFull((c0 >> 8) & 0xff,

(c1 >> 8) & 0xff,

(c2 >> 8) & 0xff);

const int b = AddSubtractComponentFull(c0 & 0xff, c1 & 0xff, c2 & 0xff);

return ((uint32_t)a << 24) | (r << 16) | (g << 8) | b;

}

static WEBP_INLINE int AddSubtractComponentHalf(int a, int b) {

return Clip255(a + (a - b) / 2);

}

static WEBP_INLINE uint32_t ClampedAddSubtractHalf(uint32_t c0, uint32_t c1,

uint32_t c2) {

const uint32_t ave = Average2(c0, c1);

const int a = AddSubtractComponentHalf(ave >> 24, c2 >> 24);

const int r = AddSubtractComponentHalf((ave >> 16) & 0xff, (c2 >> 16) & 0xff);

const int g = AddSubtractComponentHalf((ave >> 8) & 0xff, (c2 >> 8) & 0xff);

const int b = AddSubtractComponentHalf((ave >> 0) & 0xff, (c2 >> 0) & 0xff);

return ((uint32_t)a << 24) | (r << 16) | (g << 8) | b;

}

// gcc-4.9 on ARM generates incorrect code in Select() when Sub3() is inlined.

#if defined(__arm__) && \

(LOCAL_GCC_VERSION == 0x409 || LOCAL_GCC_VERSION == 0x408)

# define LOCAL_INLINE __attribute__ ((noinline))

#else

# define LOCAL_INLINE WEBP_INLINE

#endif

static LOCAL_INLINE int Sub3(int a, int b, int c) {

const int pb = b - c;

const int pa = a - c;

return abs(pb) - abs(pa);

}

#undef LOCAL_INLINE

static WEBP_INLINE uint32_t Select(uint32_t a, uint32_t b, uint32_t c) {

const int pa_minus_pb =

Sub3((a >> 24) , (b >> 24) , (c >> 24) ) +

Sub3((a >> 16) & 0xff, (b >> 16) & 0xff, (c >> 16) & 0xff) +

Sub3((a >> 8) & 0xff, (b >> 8) & 0xff, (c >> 8) & 0xff) +

Sub3((a ) & 0xff, (b ) & 0xff, (c ) & 0xff);

return (pa_minus_pb <= 0) ? a : b;

}

//------------------------------------------------------------------------------

// Predictors

static uint32_t Predictor2(uint32_t left, const uint32_t* const top) {

(void)left;

return top[0];

}

static uint32_t Predictor3(uint32_t left, const uint32_t* const top) {

(void)left;

return top[1];

}

static uint32_t Predictor4(uint32_t left, const uint32_t* const top) {

(void)left;

return top[-1];

}

static uint32_t Predictor5(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average3(left, top[0], top[1]);

return pred;

}

static uint32_t Predictor6(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average2(left, top[-1]);

return pred;

}

static uint32_t Predictor7(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average2(left, top[0]);

return pred;

}

static uint32_t Predictor8(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average2(top[-1], top[0]);

(void)left;

return pred;

}

static uint32_t Predictor9(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average2(top[0], top[1]);

(void)left;

return pred;

}

static uint32_t Predictor10(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Average4(left, top[-1], top[0], top[1]);

return pred;

}

static uint32_t Predictor11(uint32_t left, const uint32_t* const top) {

const uint32_t pred = Select(top[0], left, top[-1]);

return pred;

}

static uint32_t Predictor12(uint32_t left, const uint32_t* const top) {

const uint32_t pred = ClampedAddSubtractFull(left, top[0], top[-1]);

return pred;

}

static uint32_t Predictor13(uint32_t left, const uint32_t* const top) {

const uint32_t pred = ClampedAddSubtractHalf(left, top[0], top[-1]);

return pred;

}

//------------------------------------------------------------------------------

static void PredictorSub0_C(const uint32_t* in, const uint32_t* upper,

int num_pixels, uint32_t* out) {

int i;

for (i = 0; i < num_pixels; ++i) out[i] = VP8LSubPixels(in[i], ARGB_BLACK);

(void)upper;

}

static void PredictorSub1_C(const uint32_t* in, const uint32_t* upper,

int num_pixels, uint32_t* out) {

int i;

for (i = 0; i < num_pixels; ++i) out[i] = VP8LSubPixels(in[i], in[i - 1]);

(void)upper;

}

GENERATE_PREDICTOR_SUB(Predictor2, PredictorSub2_C)

GENERATE_PREDICTOR_SUB(Predictor3, PredictorSub3_C)

GENERATE_PREDICTOR_SUB(Predictor4, PredictorSub4_C)

GENERATE_PREDICTOR_SUB(Predictor5, PredictorSub5_C)

GENERATE_PREDICTOR_SUB(Predictor6, PredictorSub6_C)

GENERATE_PREDICTOR_SUB(Predictor7, PredictorSub7_C)

GENERATE_PREDICTOR_SUB(Predictor8, PredictorSub8_C)

GENERATE_PREDICTOR_SUB(Predictor9, PredictorSub9_C)

GENERATE_PREDICTOR_SUB(Predictor10, PredictorSub10_C)

GENERATE_PREDICTOR_SUB(Predictor11, PredictorSub11_C)

GENERATE_PREDICTOR_SUB(Predictor12, PredictorSub12_C)

GENERATE_PREDICTOR_SUB(Predictor13, PredictorSub13_C)

//------------------------------------------------------------------------------

VP8LProcessEncBlueAndRedFunc VP8LSubtractGreenFromBlueAndRed;

VP8LTransformColorFunc VP8LTransformColor;

VP8LCollectColorBlueTransformsFunc VP8LCollectColorBlueTransforms;

VP8LCollectColorRedTransformsFunc VP8LCollectColorRedTransforms;

VP8LFastLog2SlowFunc VP8LFastLog2Slow;

VP8LFastLog2SlowFunc VP8LFastSLog2Slow;

VP8LCostFunc VP8LExtraCost;

VP8LCostCombinedFunc VP8LExtraCostCombined;

VP8LCombinedShannonEntropyFunc VP8LCombinedShannonEntropy;

VP8LGetEntropyUnrefinedFunc VP8LGetEntropyUnrefined;

VP8LGetCombinedEntropyUnrefinedFunc VP8LGetCombinedEntropyUnrefined;

VP8LAddVectorFunc VP8LAddVector;

VP8LAddVectorEqFunc VP8LAddVectorEq;

VP8LVectorMismatchFunc VP8LVectorMismatch;

VP8LBundleColorMapFunc VP8LBundleColorMap;

VP8LPredictorAddSubFunc VP8LPredictorsSub[16];

VP8LPredictorAddSubFunc VP8LPredictorsSub_C[16];

extern void VP8LEncDspInitSSE2(void);

extern void VP8LEncDspInitSSE41(void);

extern void VP8LEncDspInitNEON(void);

extern void VP8LEncDspInitMIPS32(void);

extern void VP8LEncDspInitMIPSdspR2(void);

extern void VP8LEncDspInitMSA(void);

WEBP_DSP_INIT_FUNC(VP8LEncDspInit) {

VP8LDspInit();

#if !WEBP_NEON_OMIT_C_CODE

VP8LSubtractGreenFromBlueAndRed = VP8LSubtractGreenFromBlueAndRed_C;

VP8LTransformColor = VP8LTransformColor_C;

#endif

VP8LCollectColorBlueTransforms = VP8LCollectColorBlueTransforms_C;

VP8LCollectColorRedTransforms = VP8LCollectColorRedTransforms_C;

VP8LFastLog2Slow = FastLog2Slow_C;

VP8LFastSLog2Slow = FastSLog2Slow_C;

VP8LExtraCost = ExtraCost_C;

VP8LExtraCostCombined = ExtraCostCombined_C;

VP8LCombinedShannonEntropy = CombinedShannonEntropy_C;

VP8LGetEntropyUnrefined = GetEntropyUnrefined_C;

VP8LGetCombinedEntropyUnrefined = GetCombinedEntropyUnrefined_C;

VP8LAddVector = AddVector_C;

VP8LAddVectorEq = AddVectorEq_C;

VP8LVectorMismatch = VectorMismatch_C;

VP8LBundleColorMap = VP8LBundleColorMap_C;

VP8LPredictorsSub[0] = PredictorSub0_C;

VP8LPredictorsSub[1] = PredictorSub1_C;

VP8LPredictorsSub[2] = PredictorSub2_C;

VP8LPredictorsSub[3] = PredictorSub3_C;

VP8LPredictorsSub[4] = PredictorSub4_C;

VP8LPredictorsSub[5] = PredictorSub5_C;

VP8LPredictorsSub[6] = PredictorSub6_C;

VP8LPredictorsSub[7] = PredictorSub7_C;

VP8LPredictorsSub[8] = PredictorSub8_C;

VP8LPredictorsSub[9] = PredictorSub9_C;

VP8LPredictorsSub[10] = PredictorSub10_C;

VP8LPredictorsSub[11] = PredictorSub11_C;

VP8LPredictorsSub[12] = PredictorSub12_C;

VP8LPredictorsSub[13] = PredictorSub13_C;

VP8LPredictorsSub[14] = PredictorSub0_C; // <- padding security sentinels

VP8LPredictorsSub[15] = PredictorSub0_C;

VP8LPredictorsSub_C[0] = PredictorSub0_C;

VP8LPredictorsSub_C[1] = PredictorSub1_C;

VP8LPredictorsSub_C[2] = PredictorSub2_C;

VP8LPredictorsSub_C[3] = PredictorSub3_C;

VP8LPredictorsSub_C[4] = PredictorSub4_C;

VP8LPredictorsSub_C[5] = PredictorSub5_C;

VP8LPredictorsSub_C[6] = PredictorSub6_C;

VP8LPredictorsSub_C[7] = PredictorSub7_C;

VP8LPredictorsSub_C[8] = PredictorSub8_C;

VP8LPredictorsSub_C[9] = PredictorSub9_C;

VP8LPredictorsSub_C[10] = PredictorSub10_C;

VP8LPredictorsSub_C[11] = PredictorSub11_C;

VP8LPredictorsSub_C[12] = PredictorSub12_C;

VP8LPredictorsSub_C[13] = PredictorSub13_C;

VP8LPredictorsSub_C[14] = PredictorSub0_C; // <- padding security sentinels

VP8LPredictorsSub_C[15] = PredictorSub0_C;

// If defined, use CPUInfo() to overwrite some pointers with faster versions.

if (VP8GetCPUInfo != NULL) {

#if defined(WEBP_USE_SSE2)

if (VP8GetCPUInfo(kSSE2)) {

VP8LEncDspInitSSE2();

#if defined(WEBP_USE_SSE41)

if (VP8GetCPUInfo(kSSE4_1)) {

VP8LEncDspInitSSE41();

}

#endif

}

#endif

#if defined(WEBP_USE_MIPS32)

if (VP8GetCPUInfo(kMIPS32)) {

VP8LEncDspInitMIPS32();

}

#endif

#if defined(WEBP_USE_MIPS_DSP_R2)

if (VP8GetCPUInfo(kMIPSdspR2)) {

VP8LEncDspInitMIPSdspR2();

}

#endif

#if defined(WEBP_USE_MSA)

if (VP8GetCPUInfo(kMSA)) {

VP8LEncDspInitMSA();

}

#endif

}

#if defined(WEBP_USE_NEON)

if (WEBP_NEON_OMIT_C_CODE ||

(VP8GetCPUInfo != NULL && VP8GetCPUInfo(kNEON))) {

VP8LEncDspInitNEON();

}

#endif

assert(VP8LSubtractGreenFromBlueAndRed != NULL);

assert(VP8LTransformColor != NULL);