xref: /aosp_15_r20/external/libvpx/vp9/common/vp9_scan.c (revision fb1b10ab9aebc7c7068eedab379b749d7e3900be)

/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE 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.
 */

#include <assert.h>

#include "vp9/common/vp9_scan.h"

DECLARE_ALIGNED(16, static const int16_t, default_scan_4x4[16]) = {
  0, 4, 1, 5, 8, 2, 12, 9, 3, 6, 13, 10, 7, 14, 11, 15,
};

DECLARE_ALIGNED(16, static const int16_t, col_scan_4x4[16]) = {
  0, 4, 8, 1, 12, 5, 9, 2, 13, 6, 10, 3, 7, 14, 11, 15,
};

DECLARE_ALIGNED(16, static const int16_t, row_scan_4x4[16]) = {
  0, 1, 4, 2, 5, 3, 6, 8, 9, 7, 12, 10, 13, 11, 14, 15,
};

DECLARE_ALIGNED(16, static const int16_t, default_scan_8x8[64]) = {
  0,  8,  1,  16, 9,  2,  17, 24, 10, 3,  18, 25, 32, 11, 4,  26,
  33, 19, 40, 12, 34, 27, 5,  41, 20, 48, 13, 35, 42, 28, 21, 6,
  49, 56, 36, 43, 29, 7,  14, 50, 57, 44, 22, 37, 15, 51, 58, 30,
  45, 23, 52, 59, 38, 31, 60, 53, 46, 39, 61, 54, 47, 62, 55, 63,
};

DECLARE_ALIGNED(16, static const int16_t, col_scan_8x8[64]) = {
  0,  8,  16, 1,  24, 9,  32, 17, 2,  40, 25, 10, 33, 18, 48, 3,
  26, 41, 11, 56, 19, 34, 4,  49, 27, 42, 12, 35, 20, 57, 50, 28,
  5,  43, 13, 36, 58, 51, 21, 44, 6,  29, 59, 37, 14, 52, 22, 7,
  45, 60, 30, 15, 38, 53, 23, 46, 31, 61, 39, 54, 47, 62, 55, 63,
};

DECLARE_ALIGNED(16, static const int16_t, row_scan_8x8[64]) = {
  0,  1,  2,  8,  9,  3,  16, 10, 4,  17, 11, 24, 5,  18, 25, 12,
  19, 26, 32, 6,  13, 20, 33, 27, 7,  34, 40, 21, 28, 41, 14, 35,
  48, 42, 29, 36, 49, 22, 43, 15, 56, 37, 50, 44, 30, 57, 23, 51,
  58, 45, 38, 52, 31, 59, 53, 46, 60, 39, 61, 47, 54, 55, 62, 63,
};

DECLARE_ALIGNED(16, static const int16_t, default_scan_16x16[256]) = {
  0,   16,  1,   32,  17,  2,   48,  33,  18,  3,   64,  34,  49,  19,  65,
  80,  50,  4,   35,  66,  20,  81,  96,  51,  5,   36,  82,  97,  67,  112,
  21,  52,  98,  37,  83,  113, 6,   68,  128, 53,  22,  99,  114, 84,  7,
  129, 38,  69,  100, 115, 144, 130, 85,  54,  23,  8,   145, 39,  70,  116,
  101, 131, 160, 146, 55,  86,  24,  71,  132, 117, 161, 40,  9,   102, 147,
  176, 162, 87,  56,  25,  133, 118, 177, 148, 72,  103, 41,  163, 10,  192,
  178, 88,  57,  134, 149, 119, 26,  164, 73,  104, 193, 42,  179, 208, 11,
  135, 89,  165, 120, 150, 58,  194, 180, 27,  74,  209, 105, 151, 136, 43,
  90,  224, 166, 195, 181, 121, 210, 59,  12,  152, 106, 167, 196, 75,  137,
  225, 211, 240, 182, 122, 91,  28,  197, 13,  226, 168, 183, 153, 44,  212,
  138, 107, 241, 60,  29,  123, 198, 184, 227, 169, 242, 76,  213, 154, 45,
  92,  14,  199, 139, 61,  228, 214, 170, 185, 243, 108, 77,  155, 30,  15,
  200, 229, 124, 215, 244, 93,  46,  186, 171, 201, 109, 140, 230, 62,  216,
  245, 31,  125, 78,  156, 231, 47,  187, 202, 217, 94,  246, 141, 63,  232,
  172, 110, 247, 157, 79,  218, 203, 126, 233, 188, 248, 95,  173, 142, 219,
  111, 249, 234, 158, 127, 189, 204, 250, 235, 143, 174, 220, 205, 159, 251,
  190, 221, 175, 236, 237, 191, 206, 252, 222, 253, 207, 238, 223, 254, 239,
  255,
};

DECLARE_ALIGNED(16, static const int16_t, col_scan_16x16[256]) = {
  0,   16,  32,  48,  1,   64,  17,  80,  33,  96,  49,  2,   65,  112, 18,
  81,  34,  128, 50,  97,  3,   66,  144, 19,  113, 35,  82,  160, 98,  51,
  129, 4,   67,  176, 20,  114, 145, 83,  36,  99,  130, 52,  192, 5,   161,
  68,  115, 21,  146, 84,  208, 177, 37,  131, 100, 53,  162, 224, 69,  6,
  116, 193, 147, 85,  22,  240, 132, 38,  178, 101, 163, 54,  209, 117, 70,
  7,   148, 194, 86,  179, 225, 23,  133, 39,  164, 8,   102, 210, 241, 55,
  195, 118, 149, 71,  180, 24,  87,  226, 134, 165, 211, 40,  103, 56,  72,
  150, 196, 242, 119, 9,   181, 227, 88,  166, 25,  135, 41,  104, 212, 57,
  151, 197, 120, 73,  243, 182, 136, 167, 213, 89,  10,  228, 105, 152, 198,
  26,  42,  121, 183, 244, 168, 58,  137, 229, 74,  214, 90,  153, 199, 184,
  11,  106, 245, 27,  122, 230, 169, 43,  215, 59,  200, 138, 185, 246, 75,
  12,  91,  154, 216, 231, 107, 28,  44,  201, 123, 170, 60,  247, 232, 76,
  139, 13,  92,  217, 186, 248, 155, 108, 29,  124, 45,  202, 233, 171, 61,
  14,  77,  140, 15,  249, 93,  30,  187, 156, 218, 46,  109, 125, 62,  172,
  78,  203, 31,  141, 234, 94,  47,  188, 63,  157, 110, 250, 219, 79,  126,
  204, 173, 142, 95,  189, 111, 235, 158, 220, 251, 127, 174, 143, 205, 236,
  159, 190, 221, 252, 175, 206, 237, 191, 253, 222, 238, 207, 254, 223, 239,
  255,
};

DECLARE_ALIGNED(16, static const int16_t, row_scan_16x16[256]) = {
  0,   1,   2,   16,  3,   17,  4,   18,  32,  5,   33,  19,  6,   34,  48,
  20,  49,  7,   35,  21,  50,  64,  8,   36,  65,  22,  51,  37,  80,  9,
  66,  52,  23,  38,  81,  67,  10,  53,  24,  82,  68,  96,  39,  11,  54,
  83,  97,  69,  25,  98,  84,  40,  112, 55,  12,  70,  99,  113, 85,  26,
  41,  56,  114, 100, 13,  71,  128, 86,  27,  115, 101, 129, 42,  57,  72,
  116, 14,  87,  130, 102, 144, 73,  131, 117, 28,  58,  15,  88,  43,  145,
  103, 132, 146, 118, 74,  160, 89,  133, 104, 29,  59,  147, 119, 44,  161,
  148, 90,  105, 134, 162, 120, 176, 75,  135, 149, 30,  60,  163, 177, 45,
  121, 91,  106, 164, 178, 150, 192, 136, 165, 179, 31,  151, 193, 76,  122,
  61,  137, 194, 107, 152, 180, 208, 46,  166, 167, 195, 92,  181, 138, 209,
  123, 153, 224, 196, 77,  168, 210, 182, 240, 108, 197, 62,  154, 225, 183,
  169, 211, 47,  139, 93,  184, 226, 212, 241, 198, 170, 124, 155, 199, 78,
  213, 185, 109, 227, 200, 63,  228, 242, 140, 214, 171, 186, 156, 229, 243,
  125, 94,  201, 244, 215, 216, 230, 141, 187, 202, 79,  172, 110, 157, 245,
  217, 231, 95,  246, 232, 126, 203, 247, 233, 173, 218, 142, 111, 158, 188,
  248, 127, 234, 219, 249, 189, 204, 143, 174, 159, 250, 235, 205, 220, 175,
  190, 251, 221, 191, 206, 236, 207, 237, 252, 222, 253, 223, 238, 239, 254,
  255,
};

DECLARE_ALIGNED(16, static const int16_t, default_scan_32x32[1024]) = {
  0,    32,   1,    64,  33,   2,    96,   65,   34,   128,  3,    97,   66,
  160,  129,  35,   98,  4,    67,   130,  161,  192,  36,   99,   224,  5,
  162,  193,  68,   131, 37,   100,  225,  194,  256,  163,  69,   132,  6,
  226,  257,  288,  195, 101,  164,  38,   258,  7,    227,  289,  133,  320,
  70,   196,  165,  290, 259,  228,  39,   321,  102,  352,  8,    197,  71,
  134,  322,  291,  260, 353,  384,  229,  166,  103,  40,   354,  323,  292,
  135,  385,  198,  261, 72,   9,    416,  167,  386,  355,  230,  324,  104,
  293,  41,   417,  199, 136,  262,  387,  448,  325,  356,  10,   73,   418,
  231,  168,  449,  294, 388,  105,  419,  263,  42,   200,  357,  450,  137,
  480,  74,   326,  232, 11,   389,  169,  295,  420,  106,  451,  481,  358,
  264,  327,  201,  43,  138,  512,  482,  390,  296,  233,  170,  421,  75,
  452,  359,  12,   513, 265,  483,  328,  107,  202,  514,  544,  422,  391,
  453,  139,  44,   234, 484,  297,  360,  171,  76,   515,  545,  266,  329,
  454,  13,   423,  203, 108,  546,  485,  576,  298,  235,  140,  361,  330,
  172,  547,  45,   455, 267,  577,  486,  77,   204,  362,  608,  14,   299,
  578,  109,  236,  487, 609,  331,  141,  579,  46,   15,   173,  610,  363,
  78,   205,  16,   110, 237,  611,  142,  47,   174,  79,   206,  17,   111,
  238,  48,   143,  80,  175,  112,  207,  49,   18,   239,  81,   113,  19,
  50,   82,   114,  51,  83,   115,  640,  516,  392,  268,  144,  20,   672,
  641,  548,  517,  424, 393,  300,  269,  176,  145,  52,   21,   704,  673,
  642,  580,  549,  518, 456,  425,  394,  332,  301,  270,  208,  177,  146,
  84,   53,   22,   736, 705,  674,  643,  612,  581,  550,  519,  488,  457,
  426,  395,  364,  333, 302,  271,  240,  209,  178,  147,  116,  85,   54,
  23,   737,  706,  675, 613,  582,  551,  489,  458,  427,  365,  334,  303,
  241,  210,  179,  117, 86,   55,   738,  707,  614,  583,  490,  459,  366,
  335,  242,  211,  118, 87,   739,  615,  491,  367,  243,  119,  768,  644,
  520,  396,  272,  148, 24,   800,  769,  676,  645,  552,  521,  428,  397,
  304,  273,  180,  149, 56,   25,   832,  801,  770,  708,  677,  646,  584,
  553,  522,  460,  429, 398,  336,  305,  274,  212,  181,  150,  88,   57,
  26,   864,  833,  802, 771,  740,  709,  678,  647,  616,  585,  554,  523,
  492,  461,  430,  399, 368,  337,  306,  275,  244,  213,  182,  151,  120,
  89,   58,   27,   865, 834,  803,  741,  710,  679,  617,  586,  555,  493,
  462,  431,  369,  338, 307,  245,  214,  183,  121,  90,   59,   866,  835,
  742,  711,  618,  587, 494,  463,  370,  339,  246,  215,  122,  91,   867,
  743,  619,  495,  371, 247,  123,  896,  772,  648,  524,  400,  276,  152,
  28,   928,  897,  804, 773,  680,  649,  556,  525,  432,  401,  308,  277,
  184,  153,  60,   29,  960,  929,  898,  836,  805,  774,  712,  681,  650,
  588,  557,  526,  464, 433,  402,  340,  309,  278,  216,  185,  154,  92,
  61,   30,   992,  961, 930,  899,  868,  837,  806,  775,  744,  713,  682,
  651,  620,  589,  558, 527,  496,  465,  434,  403,  372,  341,  310,  279,
  248,  217,  186,  155, 124,  93,   62,   31,   993,  962,  931,  869,  838,
  807,  745,  714,  683, 621,  590,  559,  497,  466,  435,  373,  342,  311,
  249,  218,  187,  125, 94,   63,   994,  963,  870,  839,  746,  715,  622,
  591,  498,  467,  374, 343,  250,  219,  126,  95,   995,  871,  747,  623,
  499,  375,  251,  127, 900,  776,  652,  528,  404,  280,  156,  932,  901,
  808,  777,  684,  653, 560,  529,  436,  405,  312,  281,  188,  157,  964,
  933,  902,  840,  809, 778,  716,  685,  654,  592,  561,  530,  468,  437,
  406,  344,  313,  282, 220,  189,  158,  996,  965,  934,  903,  872,  841,
  810,  779,  748,  717, 686,  655,  624,  593,  562,  531,  500,  469,  438,
  407,  376,  345,  314, 283,  252,  221,  190,  159,  997,  966,  935,  873,
  842,  811,  749,  718, 687,  625,  594,  563,  501,  470,  439,  377,  346,
  315,  253,  222,  191, 998,  967,  874,  843,  750,  719,  626,  595,  502,
  471,  378,  347,  254, 223,  999,  875,  751,  627,  503,  379,  255,  904,
  780,  656,  532,  408, 284,  936,  905,  812,  781,  688,  657,  564,  533,
  440,  409,  316,  285, 968,  937,  906,  844,  813,  782,  720,  689,  658,
  596,  565,  534,  472, 441,  410,  348,  317,  286,  1000, 969,  938,  907,
  876,  845,  814,  783, 752,  721,  690,  659,  628,  597,  566,  535,  504,
  473,  442,  411,  380, 349,  318,  287,  1001, 970,  939,  877,  846,  815,
  753,  722,  691,  629, 598,  567,  505,  474,  443,  381,  350,  319,  1002,
  971,  878,  847,  754, 723,  630,  599,  506,  475,  382,  351,  1003, 879,
  755,  631,  507,  383, 908,  784,  660,  536,  412,  940,  909,  816,  785,
  692,  661,  568,  537, 444,  413,  972,  941,  910,  848,  817,  786,  724,
  693,  662,  600,  569, 538,  476,  445,  414,  1004, 973,  942,  911,  880,
  849,  818,  787,  756, 725,  694,  663,  632,  601,  570,  539,  508,  477,
  446,  415,  1005, 974, 943,  881,  850,  819,  757,  726,  695,  633,  602,
  571,  509,  478,  447, 1006, 975,  882,  851,  758,  727,  634,  603,  510,
  479,  1007, 883,  759, 635,  511,  912,  788,  664,  540,  944,  913,  820,
  789,  696,  665,  572, 541,  976,  945,  914,  852,  821,  790,  728,  697,
  666,  604,  573,  542, 1008, 977,  946,  915,  884,  853,  822,  791,  760,
  729,  698,  667,  636, 605,  574,  543,  1009, 978,  947,  885,  854,  823,
  761,  730,  699,  637, 606,  575,  1010, 979,  886,  855,  762,  731,  638,
  607,  1011, 887,  763, 639,  916,  792,  668,  948,  917,  824,  793,  700,
  669,  980,  949,  918, 856,  825,  794,  732,  701,  670,  1012, 981,  950,
  919,  888,  857,  826, 795,  764,  733,  702,  671,  1013, 982,  951,  889,
  858,  827,  765,  734, 703,  1014, 983,  890,  859,  766,  735,  1015, 891,
  767,  920,  796,  952, 921,  828,  797,  984,  953,  922,  860,  829,  798,
  1016, 985,  954,  923, 892,  861,  830,  799,  1017, 986,  955,  893,  862,
  831,  1018, 987,  894, 863,  1019, 895,  924,  956,  925,  988,  957,  926,
  1020, 989,  958,  927, 1021, 990,  959,  1022, 991,  1023,
};

// Neighborhood 2-tuples for various scans and blocksizes,
// in {top, left} order for each position in corresponding scan order.
DECLARE_ALIGNED(16, static const int16_t,
                default_scan_4x4_neighbors[17 * MAX_NEIGHBORS]) = {
  0, 0, 0, 0, 0,  0, 1, 4, 4, 4,  1,  1, 8,  8,  5,  8, 2,
  2, 2, 5, 9, 12, 6, 9, 3, 6, 10, 13, 7, 10, 11, 14, 0, 0,
};

DECLARE_ALIGNED(16, static const int16_t,
                col_scan_4x4_neighbors[17 * MAX_NEIGHBORS]) = {
  0, 0, 0, 0, 4, 4, 0, 0, 8, 8,  1,  1, 5, 5,  1,  1, 9,
  9, 2, 2, 6, 6, 2, 2, 3, 3, 10, 10, 7, 7, 11, 11, 0, 0,
};

DECLARE_ALIGNED(16, static const int16_t,
                row_scan_4x4_neighbors[17 * MAX_NEIGHBORS]) = {
  0, 0, 0, 0, 0, 0, 1, 1,  4,  4,  2,  2,  5,  5,  4,  4, 8,
  8, 6, 6, 8, 8, 9, 9, 12, 12, 10, 10, 13, 13, 14, 14, 0, 0,
};

DECLARE_ALIGNED(16, static const int16_t,
                col_scan_8x8_neighbors[65 * MAX_NEIGHBORS]) = {
  0,  0,  0,  0,  8,  8,  0,  0,  16, 16, 1,  1,  24, 24, 9,  9,  1,  1,  32,
  32, 17, 17, 2,  2,  25, 25, 10, 10, 40, 40, 2,  2,  18, 18, 33, 33, 3,  3,
  48, 48, 11, 11, 26, 26, 3,  3,  41, 41, 19, 19, 34, 34, 4,  4,  27, 27, 12,
  12, 49, 49, 42, 42, 20, 20, 4,  4,  35, 35, 5,  5,  28, 28, 50, 50, 43, 43,
  13, 13, 36, 36, 5,  5,  21, 21, 51, 51, 29, 29, 6,  6,  44, 44, 14, 14, 6,
  6,  37, 37, 52, 52, 22, 22, 7,  7,  30, 30, 45, 45, 15, 15, 38, 38, 23, 23,
  53, 53, 31, 31, 46, 46, 39, 39, 54, 54, 47, 47, 55, 55, 0,  0,
};

DECLARE_ALIGNED(16, static const int16_t,
                row_scan_8x8_neighbors[65 * MAX_NEIGHBORS]) = {
  0,  0,  0,  0,  1,  1,  0,  0,  8,  8,  2,  2,  8,  8,  9,  9,  3,  3,  16,
  16, 10, 10, 16, 16, 4,  4,  17, 17, 24, 24, 11, 11, 18, 18, 25, 25, 24, 24,
  5,  5,  12, 12, 19, 19, 32, 32, 26, 26, 6,  6,  33, 33, 32, 32, 20, 20, 27,
  27, 40, 40, 13, 13, 34, 34, 40, 40, 41, 41, 28, 28, 35, 35, 48, 48, 21, 21,
  42, 42, 14, 14, 48, 48, 36, 36, 49, 49, 43, 43, 29, 29, 56, 56, 22, 22, 50,
  50, 57, 57, 44, 44, 37, 37, 51, 51, 30, 30, 58, 58, 52, 52, 45, 45, 59, 59,
  38, 38, 60, 60, 46, 46, 53, 53, 54, 54, 61, 61, 62, 62, 0,  0,
};

DECLARE_ALIGNED(16, static const int16_t,
                default_scan_8x8_neighbors[65 * MAX_NEIGHBORS]) = {
  0,  0,  0,  0,  0,  0,  8,  8,  1,  8,  1,  1,  9,  16, 16, 16, 2,  9,  2,
  2,  10, 17, 17, 24, 24, 24, 3,  10, 3,  3,  18, 25, 25, 32, 11, 18, 32, 32,
  4,  11, 26, 33, 19, 26, 4,  4,  33, 40, 12, 19, 40, 40, 5,  12, 27, 34, 34,
  41, 20, 27, 13, 20, 5,  5,  41, 48, 48, 48, 28, 35, 35, 42, 21, 28, 6,  6,
  6,  13, 42, 49, 49, 56, 36, 43, 14, 21, 29, 36, 7,  14, 43, 50, 50, 57, 22,
  29, 37, 44, 15, 22, 44, 51, 51, 58, 30, 37, 23, 30, 52, 59, 45, 52, 38, 45,
  31, 38, 53, 60, 46, 53, 39, 46, 54, 61, 47, 54, 55, 62, 0,  0,
};

DECLARE_ALIGNED(16, static const int16_t,
                col_scan_16x16_neighbors[257 * MAX_NEIGHBORS]) = {
  0,   0,   0,   0,   16,  16,  32,  32,  0,   0,   48,  48,  1,   1,   64,
  64,  17,  17,  80,  80,  33,  33,  1,   1,   49,  49,  96,  96,  2,   2,
  65,  65,  18,  18,  112, 112, 34,  34,  81,  81,  2,   2,   50,  50,  128,
  128, 3,   3,   97,  97,  19,  19,  66,  66,  144, 144, 82,  82,  35,  35,
  113, 113, 3,   3,   51,  51,  160, 160, 4,   4,   98,  98,  129, 129, 67,
  67,  20,  20,  83,  83,  114, 114, 36,  36,  176, 176, 4,   4,   145, 145,
  52,  52,  99,  99,  5,   5,   130, 130, 68,  68,  192, 192, 161, 161, 21,
  21,  115, 115, 84,  84,  37,  37,  146, 146, 208, 208, 53,  53,  5,   5,
  100, 100, 177, 177, 131, 131, 69,  69,  6,   6,   224, 224, 116, 116, 22,
  22,  162, 162, 85,  85,  147, 147, 38,  38,  193, 193, 101, 101, 54,  54,
  6,   6,   132, 132, 178, 178, 70,  70,  163, 163, 209, 209, 7,   7,   117,
  117, 23,  23,  148, 148, 7,   7,   86,  86,  194, 194, 225, 225, 39,  39,
  179, 179, 102, 102, 133, 133, 55,  55,  164, 164, 8,   8,   71,  71,  210,
  210, 118, 118, 149, 149, 195, 195, 24,  24,  87,  87,  40,  40,  56,  56,
  134, 134, 180, 180, 226, 226, 103, 103, 8,   8,   165, 165, 211, 211, 72,
  72,  150, 150, 9,   9,   119, 119, 25,  25,  88,  88,  196, 196, 41,  41,
  135, 135, 181, 181, 104, 104, 57,  57,  227, 227, 166, 166, 120, 120, 151,
  151, 197, 197, 73,  73,  9,   9,   212, 212, 89,  89,  136, 136, 182, 182,
  10,  10,  26,  26,  105, 105, 167, 167, 228, 228, 152, 152, 42,  42,  121,
  121, 213, 213, 58,  58,  198, 198, 74,  74,  137, 137, 183, 183, 168, 168,
  10,  10,  90,  90,  229, 229, 11,  11,  106, 106, 214, 214, 153, 153, 27,
  27,  199, 199, 43,  43,  184, 184, 122, 122, 169, 169, 230, 230, 59,  59,
  11,  11,  75,  75,  138, 138, 200, 200, 215, 215, 91,  91,  12,  12,  28,
  28,  185, 185, 107, 107, 154, 154, 44,  44,  231, 231, 216, 216, 60,  60,
  123, 123, 12,  12,  76,  76,  201, 201, 170, 170, 232, 232, 139, 139, 92,
  92,  13,  13,  108, 108, 29,  29,  186, 186, 217, 217, 155, 155, 45,  45,
  13,  13,  61,  61,  124, 124, 14,  14,  233, 233, 77,  77,  14,  14,  171,
  171, 140, 140, 202, 202, 30,  30,  93,  93,  109, 109, 46,  46,  156, 156,
  62,  62,  187, 187, 15,  15,  125, 125, 218, 218, 78,  78,  31,  31,  172,
  172, 47,  47,  141, 141, 94,  94,  234, 234, 203, 203, 63,  63,  110, 110,
  188, 188, 157, 157, 126, 126, 79,  79,  173, 173, 95,  95,  219, 219, 142,
  142, 204, 204, 235, 235, 111, 111, 158, 158, 127, 127, 189, 189, 220, 220,
  143, 143, 174, 174, 205, 205, 236, 236, 159, 159, 190, 190, 221, 221, 175,
  175, 237, 237, 206, 206, 222, 222, 191, 191, 238, 238, 207, 207, 223, 223,
  239, 239, 0,   0,
};

DECLARE_ALIGNED(16, static const int16_t,
                row_scan_16x16_neighbors[257 * MAX_NEIGHBORS]) = {
  0,   0,   0,   0,   1,   1,   0,   0,   2,   2,   16,  16,  3,   3,   17,
  17,  16,  16,  4,   4,   32,  32,  18,  18,  5,   5,   33,  33,  32,  32,
  19,  19,  48,  48,  6,   6,   34,  34,  20,  20,  49,  49,  48,  48,  7,
  7,   35,  35,  64,  64,  21,  21,  50,  50,  36,  36,  64,  64,  8,   8,
  65,  65,  51,  51,  22,  22,  37,  37,  80,  80,  66,  66,  9,   9,   52,
  52,  23,  23,  81,  81,  67,  67,  80,  80,  38,  38,  10,  10,  53,  53,
  82,  82,  96,  96,  68,  68,  24,  24,  97,  97,  83,  83,  39,  39,  96,
  96,  54,  54,  11,  11,  69,  69,  98,  98,  112, 112, 84,  84,  25,  25,
  40,  40,  55,  55,  113, 113, 99,  99,  12,  12,  70,  70,  112, 112, 85,
  85,  26,  26,  114, 114, 100, 100, 128, 128, 41,  41,  56,  56,  71,  71,
  115, 115, 13,  13,  86,  86,  129, 129, 101, 101, 128, 128, 72,  72,  130,
  130, 116, 116, 27,  27,  57,  57,  14,  14,  87,  87,  42,  42,  144, 144,
  102, 102, 131, 131, 145, 145, 117, 117, 73,  73,  144, 144, 88,  88,  132,
  132, 103, 103, 28,  28,  58,  58,  146, 146, 118, 118, 43,  43,  160, 160,
  147, 147, 89,  89,  104, 104, 133, 133, 161, 161, 119, 119, 160, 160, 74,
  74,  134, 134, 148, 148, 29,  29,  59,  59,  162, 162, 176, 176, 44,  44,
  120, 120, 90,  90,  105, 105, 163, 163, 177, 177, 149, 149, 176, 176, 135,
  135, 164, 164, 178, 178, 30,  30,  150, 150, 192, 192, 75,  75,  121, 121,
  60,  60,  136, 136, 193, 193, 106, 106, 151, 151, 179, 179, 192, 192, 45,
  45,  165, 165, 166, 166, 194, 194, 91,  91,  180, 180, 137, 137, 208, 208,
  122, 122, 152, 152, 208, 208, 195, 195, 76,  76,  167, 167, 209, 209, 181,
  181, 224, 224, 107, 107, 196, 196, 61,  61,  153, 153, 224, 224, 182, 182,
  168, 168, 210, 210, 46,  46,  138, 138, 92,  92,  183, 183, 225, 225, 211,
  211, 240, 240, 197, 197, 169, 169, 123, 123, 154, 154, 198, 198, 77,  77,
  212, 212, 184, 184, 108, 108, 226, 226, 199, 199, 62,  62,  227, 227, 241,
  241, 139, 139, 213, 213, 170, 170, 185, 185, 155, 155, 228, 228, 242, 242,
  124, 124, 93,  93,  200, 200, 243, 243, 214, 214, 215, 215, 229, 229, 140,
  140, 186, 186, 201, 201, 78,  78,  171, 171, 109, 109, 156, 156, 244, 244,
  216, 216, 230, 230, 94,  94,  245, 245, 231, 231, 125, 125, 202, 202, 246,
  246, 232, 232, 172, 172, 217, 217, 141, 141, 110, 110, 157, 157, 187, 187,
  247, 247, 126, 126, 233, 233, 218, 218, 248, 248, 188, 188, 203, 203, 142,
  142, 173, 173, 158, 158, 249, 249, 234, 234, 204, 204, 219, 219, 174, 174,
  189, 189, 250, 250, 220, 220, 190, 190, 205, 205, 235, 235, 206, 206, 236,
  236, 251, 251, 221, 221, 252, 252, 222, 222, 237, 237, 238, 238, 253, 253,
  254, 254, 0,   0,
};

DECLARE_ALIGNED(16, static const int16_t,
                default_scan_16x16_neighbors[257 * MAX_NEIGHBORS]) = {
  0,   0,   0,   0,   0,   0,   16,  16,  1,   16,  1,   1,   32,  32,  17,
  32,  2,   17,  2,   2,   48,  48,  18,  33,  33,  48,  3,   18,  49,  64,
  64,  64,  34,  49,  3,   3,   19,  34,  50,  65,  4,   19,  65,  80,  80,
  80,  35,  50,  4,   4,   20,  35,  66,  81,  81,  96,  51,  66,  96,  96,
  5,   20,  36,  51,  82,  97,  21,  36,  67,  82,  97,  112, 5,   5,   52,
  67,  112, 112, 37,  52,  6,   21,  83,  98,  98,  113, 68,  83,  6,   6,
  113, 128, 22,  37,  53,  68,  84,  99,  99,  114, 128, 128, 114, 129, 69,
  84,  38,  53,  7,   22,  7,   7,   129, 144, 23,  38,  54,  69,  100, 115,
  85,  100, 115, 130, 144, 144, 130, 145, 39,  54,  70,  85,  8,   23,  55,
  70,  116, 131, 101, 116, 145, 160, 24,  39,  8,   8,   86,  101, 131, 146,
  160, 160, 146, 161, 71,  86,  40,  55,  9,   24,  117, 132, 102, 117, 161,
  176, 132, 147, 56,  71,  87,  102, 25,  40,  147, 162, 9,   9,   176, 176,
  162, 177, 72,  87,  41,  56,  118, 133, 133, 148, 103, 118, 10,  25,  148,
  163, 57,  72,  88,  103, 177, 192, 26,  41,  163, 178, 192, 192, 10,  10,
  119, 134, 73,  88,  149, 164, 104, 119, 134, 149, 42,  57,  178, 193, 164,
  179, 11,  26,  58,  73,  193, 208, 89,  104, 135, 150, 120, 135, 27,  42,
  74,  89,  208, 208, 150, 165, 179, 194, 165, 180, 105, 120, 194, 209, 43,
  58,  11,  11,  136, 151, 90,  105, 151, 166, 180, 195, 59,  74,  121, 136,
  209, 224, 195, 210, 224, 224, 166, 181, 106, 121, 75,  90,  12,  27,  181,
  196, 12,  12,  210, 225, 152, 167, 167, 182, 137, 152, 28,  43,  196, 211,
  122, 137, 91,  106, 225, 240, 44,  59,  13,  28,  107, 122, 182, 197, 168,
  183, 211, 226, 153, 168, 226, 241, 60,  75,  197, 212, 138, 153, 29,  44,
  76,  91,  13,  13,  183, 198, 123, 138, 45,  60,  212, 227, 198, 213, 154,
  169, 169, 184, 227, 242, 92,  107, 61,  76,  139, 154, 14,  29,  14,  14,
  184, 199, 213, 228, 108, 123, 199, 214, 228, 243, 77,  92,  30,  45,  170,
  185, 155, 170, 185, 200, 93,  108, 124, 139, 214, 229, 46,  61,  200, 215,
  229, 244, 15,  30,  109, 124, 62,  77,  140, 155, 215, 230, 31,  46,  171,
  186, 186, 201, 201, 216, 78,  93,  230, 245, 125, 140, 47,  62,  216, 231,
  156, 171, 94,  109, 231, 246, 141, 156, 63,  78,  202, 217, 187, 202, 110,
  125, 217, 232, 172, 187, 232, 247, 79,  94,  157, 172, 126, 141, 203, 218,
  95,  110, 233, 248, 218, 233, 142, 157, 111, 126, 173, 188, 188, 203, 234,
  249, 219, 234, 127, 142, 158, 173, 204, 219, 189, 204, 143, 158, 235, 250,
  174, 189, 205, 220, 159, 174, 220, 235, 221, 236, 175, 190, 190, 205, 236,
  251, 206, 221, 237, 252, 191, 206, 222, 237, 207, 222, 238, 253, 223, 238,
  239, 254, 0,   0,
};

DECLARE_ALIGNED(16, static const int16_t,
                default_scan_32x32_neighbors[1025 * MAX_NEIGHBORS]) = {
  0,   0,    0,   0,    0,   0,    32,  32,   1,   32,  1,   1,    64,  64,
  33,  64,   2,   33,   96,  96,   2,   2,    65,  96,  34,  65,   128, 128,
  97,  128,  3,   34,   66,  97,   3,   3,    35,  66,  98,  129,  129, 160,
  160, 160,  4,   35,   67,  98,   192, 192,  4,   4,   130, 161,  161, 192,
  36,  67,   99,  130,  5,   36,   68,  99,   193, 224, 162, 193,  224, 224,
  131, 162,  37,  68,   100, 131,  5,   5,    194, 225, 225, 256,  256, 256,
  163, 194,  69,  100,  132, 163,  6,   37,   226, 257, 6,   6,    195, 226,
  257, 288,  101, 132,  288, 288,  38,  69,   164, 195, 133, 164,  258, 289,
  227, 258,  196, 227,  7,   38,   289, 320,  70,  101, 320, 320,  7,   7,
  165, 196,  39,  70,   102, 133,  290, 321,  259, 290, 228, 259,  321, 352,
  352, 352,  197, 228,  134, 165,  71,  102,  8,   39,  322, 353,  291, 322,
  260, 291,  103, 134,  353, 384,  166, 197,  229, 260, 40,  71,   8,   8,
  384, 384,  135, 166,  354, 385,  323, 354,  198, 229, 292, 323,  72,  103,
  261, 292,  9,   40,   385, 416,  167, 198,  104, 135, 230, 261,  355, 386,
  416, 416,  293, 324,  324, 355,  9,   9,    41,  72,  386, 417,  199, 230,
  136, 167,  417, 448,  262, 293,  356, 387,  73,  104, 387, 418,  231, 262,
  10,  41,   168, 199,  325, 356,  418, 449,  105, 136, 448, 448,  42,  73,
  294, 325,  200, 231,  10,  10,   357, 388,  137, 168, 263, 294,  388, 419,
  74,  105,  419, 450,  449, 480,  326, 357,  232, 263, 295, 326,  169, 200,
  11,  42,   106, 137,  480, 480,  450, 481,  358, 389, 264, 295,  201, 232,
  138, 169,  389, 420,  43,  74,   420, 451,  327, 358, 11,  11,   481, 512,
  233, 264,  451, 482,  296, 327,  75,  106,  170, 201, 482, 513,  512, 512,
  390, 421,  359, 390,  421, 452,  107, 138,  12,  43,  202, 233,  452, 483,
  265, 296,  328, 359,  139, 170,  44,  75,   483, 514, 513, 544,  234, 265,
  297, 328,  422, 453,  12,  12,   391, 422,  171, 202, 76,  107,  514, 545,
  453, 484,  544, 544,  266, 297,  203, 234,  108, 139, 329, 360,  298, 329,
  140, 171,  515, 546,  13,  44,   423, 454,  235, 266, 545, 576,  454, 485,
  45,  76,   172, 203,  330, 361,  576, 576,  13,  13,  267, 298,  546, 577,
  77,  108,  204, 235,  455, 486,  577, 608,  299, 330, 109, 140,  547, 578,
  14,  45,   14,  14,   141, 172,  578, 609,  331, 362, 46,  77,   173, 204,
  15,  15,   78,  109,  205, 236,  579, 610,  110, 141, 15,  46,   142, 173,
  47,  78,   174, 205,  16,  16,   79,  110,  206, 237, 16,  47,   111, 142,
  48,  79,   143, 174,  80,  111,  175, 206,  17,  48,  17,  17,   207, 238,
  49,  80,   81,  112,  18,  18,   18,  49,   50,  81,  82,  113,  19,  50,
  51,  82,   83,  114,  608, 608,  484, 515,  360, 391, 236, 267,  112, 143,
  19,  19,   640, 640,  609, 640,  516, 547,  485, 516, 392, 423,  361, 392,
  268, 299,  237, 268,  144, 175,  113, 144,  20,  51,  20,  20,   672, 672,
  641, 672,  610, 641,  548, 579,  517, 548,  486, 517, 424, 455,  393, 424,
  362, 393,  300, 331,  269, 300,  238, 269,  176, 207, 145, 176,  114, 145,
  52,  83,   21,  52,   21,  21,   704, 704,  673, 704, 642, 673,  611, 642,
  580, 611,  549, 580,  518, 549,  487, 518,  456, 487, 425, 456,  394, 425,
  363, 394,  332, 363,  301, 332,  270, 301,  239, 270, 208, 239,  177, 208,
  146, 177,  115, 146,  84,  115,  53,  84,   22,  53,  22,  22,   705, 736,
  674, 705,  643, 674,  581, 612,  550, 581,  519, 550, 457, 488,  426, 457,
  395, 426,  333, 364,  302, 333,  271, 302,  209, 240, 178, 209,  147, 178,
  85,  116,  54,  85,   23,  54,   706, 737,  675, 706, 582, 613,  551, 582,
  458, 489,  427, 458,  334, 365,  303, 334,  210, 241, 179, 210,  86,  117,
  55,  86,   707, 738,  583, 614,  459, 490,  335, 366, 211, 242,  87,  118,
  736, 736,  612, 643,  488, 519,  364, 395,  240, 271, 116, 147,  23,  23,
  768, 768,  737, 768,  644, 675,  613, 644,  520, 551, 489, 520,  396, 427,
  365, 396,  272, 303,  241, 272,  148, 179,  117, 148, 24,  55,   24,  24,
  800, 800,  769, 800,  738, 769,  676, 707,  645, 676, 614, 645,  552, 583,
  521, 552,  490, 521,  428, 459,  397, 428,  366, 397, 304, 335,  273, 304,
  242, 273,  180, 211,  149, 180,  118, 149,  56,  87,  25,  56,   25,  25,
  832, 832,  801, 832,  770, 801,  739, 770,  708, 739, 677, 708,  646, 677,
  615, 646,  584, 615,  553, 584,  522, 553,  491, 522, 460, 491,  429, 460,
  398, 429,  367, 398,  336, 367,  305, 336,  274, 305, 243, 274,  212, 243,
  181, 212,  150, 181,  119, 150,  88,  119,  57,  88,  26,  57,   26,  26,
  833, 864,  802, 833,  771, 802,  709, 740,  678, 709, 647, 678,  585, 616,
  554, 585,  523, 554,  461, 492,  430, 461,  399, 430, 337, 368,  306, 337,
  275, 306,  213, 244,  182, 213,  151, 182,  89,  120, 58,  89,   27,  58,
  834, 865,  803, 834,  710, 741,  679, 710,  586, 617, 555, 586,  462, 493,
  431, 462,  338, 369,  307, 338,  214, 245,  183, 214, 90,  121,  59,  90,
  835, 866,  711, 742,  587, 618,  463, 494,  339, 370, 215, 246,  91,  122,
  864, 864,  740, 771,  616, 647,  492, 523,  368, 399, 244, 275,  120, 151,
  27,  27,   896, 896,  865, 896,  772, 803,  741, 772, 648, 679,  617, 648,
  524, 555,  493, 524,  400, 431,  369, 400,  276, 307, 245, 276,  152, 183,
  121, 152,  28,  59,   28,  28,   928, 928,  897, 928, 866, 897,  804, 835,
  773, 804,  742, 773,  680, 711,  649, 680,  618, 649, 556, 587,  525, 556,
  494, 525,  432, 463,  401, 432,  370, 401,  308, 339, 277, 308,  246, 277,
  184, 215,  153, 184,  122, 153,  60,  91,   29,  60,  29,  29,   960, 960,
  929, 960,  898, 929,  867, 898,  836, 867,  805, 836, 774, 805,  743, 774,
  712, 743,  681, 712,  650, 681,  619, 650,  588, 619, 557, 588,  526, 557,
  495, 526,  464, 495,  433, 464,  402, 433,  371, 402, 340, 371,  309, 340,
  278, 309,  247, 278,  216, 247,  185, 216,  154, 185, 123, 154,  92,  123,
  61,  92,   30,  61,   30,  30,   961, 992,  930, 961, 899, 930,  837, 868,
  806, 837,  775, 806,  713, 744,  682, 713,  651, 682, 589, 620,  558, 589,
  527, 558,  465, 496,  434, 465,  403, 434,  341, 372, 310, 341,  279, 310,
  217, 248,  186, 217,  155, 186,  93,  124,  62,  93,  31,  62,   962, 993,
  931, 962,  838, 869,  807, 838,  714, 745,  683, 714, 590, 621,  559, 590,
  466, 497,  435, 466,  342, 373,  311, 342,  218, 249, 187, 218,  94,  125,
  63,  94,   963, 994,  839, 870,  715, 746,  591, 622, 467, 498,  343, 374,
  219, 250,  95,  126,  868, 899,  744, 775,  620, 651, 496, 527,  372, 403,
  248, 279,  124, 155,  900, 931,  869, 900,  776, 807, 745, 776,  652, 683,
  621, 652,  528, 559,  497, 528,  404, 435,  373, 404, 280, 311,  249, 280,
  156, 187,  125, 156,  932, 963,  901, 932,  870, 901, 808, 839,  777, 808,
  746, 777,  684, 715,  653, 684,  622, 653,  560, 591, 529, 560,  498, 529,
  436, 467,  405, 436,  374, 405,  312, 343,  281, 312, 250, 281,  188, 219,
  157, 188,  126, 157,  964, 995,  933, 964,  902, 933, 871, 902,  840, 871,
  809, 840,  778, 809,  747, 778,  716, 747,  685, 716, 654, 685,  623, 654,
  592, 623,  561, 592,  530, 561,  499, 530,  468, 499, 437, 468,  406, 437,
  375, 406,  344, 375,  313, 344,  282, 313,  251, 282, 220, 251,  189, 220,
  158, 189,  127, 158,  965, 996,  934, 965,  903, 934, 841, 872,  810, 841,
  779, 810,  717, 748,  686, 717,  655, 686,  593, 624, 562, 593,  531, 562,
  469, 500,  438, 469,  407, 438,  345, 376,  314, 345, 283, 314,  221, 252,
  190, 221,  159, 190,  966, 997,  935, 966,  842, 873, 811, 842,  718, 749,
  687, 718,  594, 625,  563, 594,  470, 501,  439, 470, 346, 377,  315, 346,
  222, 253,  191, 222,  967, 998,  843, 874,  719, 750, 595, 626,  471, 502,
  347, 378,  223, 254,  872, 903,  748, 779,  624, 655, 500, 531,  376, 407,
  252, 283,  904, 935,  873, 904,  780, 811,  749, 780, 656, 687,  625, 656,
  532, 563,  501, 532,  408, 439,  377, 408,  284, 315, 253, 284,  936, 967,
  905, 936,  874, 905,  812, 843,  781, 812,  750, 781, 688, 719,  657, 688,
  626, 657,  564, 595,  533, 564,  502, 533,  440, 471, 409, 440,  378, 409,
  316, 347,  285, 316,  254, 285,  968, 999,  937, 968, 906, 937,  875, 906,
  844, 875,  813, 844,  782, 813,  751, 782,  720, 751, 689, 720,  658, 689,
  627, 658,  596, 627,  565, 596,  534, 565,  503, 534, 472, 503,  441, 472,
  410, 441,  379, 410,  348, 379,  317, 348,  286, 317, 255, 286,  969, 1000,
  938, 969,  907, 938,  845, 876,  814, 845,  783, 814, 721, 752,  690, 721,
  659, 690,  597, 628,  566, 597,  535, 566,  473, 504, 442, 473,  411, 442,
  349, 380,  318, 349,  287, 318,  970, 1001, 939, 970, 846, 877,  815, 846,
  722, 753,  691, 722,  598, 629,  567, 598,  474, 505, 443, 474,  350, 381,
  319, 350,  971, 1002, 847, 878,  723, 754,  599, 630, 475, 506,  351, 382,
  876, 907,  752, 783,  628, 659,  504, 535,  380, 411, 908, 939,  877, 908,
  784, 815,  753, 784,  660, 691,  629, 660,  536, 567, 505, 536,  412, 443,
  381, 412,  940, 971,  909, 940,  878, 909,  816, 847, 785, 816,  754, 785,
  692, 723,  661, 692,  630, 661,  568, 599,  537, 568, 506, 537,  444, 475,
  413, 444,  382, 413,  972, 1003, 941, 972,  910, 941, 879, 910,  848, 879,
  817, 848,  786, 817,  755, 786,  724, 755,  693, 724, 662, 693,  631, 662,
  600, 631,  569, 600,  538, 569,  507, 538,  476, 507, 445, 476,  414, 445,
  383, 414,  973, 1004, 942, 973,  911, 942,  849, 880, 818, 849,  787, 818,
  725, 756,  694, 725,  663, 694,  601, 632,  570, 601, 539, 570,  477, 508,
  446, 477,  415, 446,  974, 1005, 943, 974,  850, 881, 819, 850,  726, 757,
  695, 726,  602, 633,  571, 602,  478, 509,  447, 478, 975, 1006, 851, 882,
  727, 758,  603, 634,  479, 510,  880, 911,  756, 787, 632, 663,  508, 539,
  912, 943,  881, 912,  788, 819,  757, 788,  664, 695, 633, 664,  540, 571,
  509, 540,  944, 975,  913, 944,  882, 913,  820, 851, 789, 820,  758, 789,
  696, 727,  665, 696,  634, 665,  572, 603,  541, 572, 510, 541,  976, 1007,
  945, 976,  914, 945,  883, 914,  852, 883,  821, 852, 790, 821,  759, 790,
  728, 759,  697, 728,  666, 697,  635, 666,  604, 635, 573, 604,  542, 573,
  511, 542,  977, 1008, 946, 977,  915, 946,  853, 884, 822, 853,  791, 822,
  729, 760,  698, 729,  667, 698,  605, 636,  574, 605, 543, 574,  978, 1009,
  947, 978,  854, 885,  823, 854,  730, 761,  699, 730, 606, 637,  575, 606,
  979, 1010, 855, 886,  731, 762,  607, 638,  884, 915, 760, 791,  636, 667,
  916, 947,  885, 916,  792, 823,  761, 792,  668, 699, 637, 668,  948, 979,
  917, 948,  886, 917,  824, 855,  793, 824,  762, 793, 700, 731,  669, 700,
  638, 669,  980, 1011, 949, 980,  918, 949,  887, 918, 856, 887,  825, 856,
  794, 825,  763, 794,  732, 763,  701, 732,  670, 701, 639, 670,  981, 1012,
  950, 981,  919, 950,  857, 888,  826, 857,  795, 826, 733, 764,  702, 733,
  671, 702,  982, 1013, 951, 982,  858, 889,  827, 858, 734, 765,  703, 734,
  983, 1014, 859, 890,  735, 766,  888, 919,  764, 795, 920, 951,  889, 920,
  796, 827,  765, 796,  952, 983,  921, 952,  890, 921, 828, 859,  797, 828,
  766, 797,  984, 1015, 953, 984,  922, 953,  891, 922, 860, 891,  829, 860,
  798, 829,  767, 798,  985, 1016, 954, 985,  923, 954, 861, 892,  830, 861,
  799, 830,  986, 1017, 955, 986,  862, 893,  831, 862, 987, 1018, 863, 894,
  892, 923,  924, 955,  893, 924,  956, 987,  925, 956, 894, 925,  988, 1019,
  957, 988,  926, 957,  895, 926,  989, 1020, 958, 989, 927, 958,  990, 1021,
  959, 990,  991, 1022, 0,   0,
};

// Add 1 to iscan values. This represents the EOB position instead of the index.
DECLARE_ALIGNED(16, static const int16_t, vp9_default_iscan_4x4[16]) = {
  1, 3, 6, 9, 2, 4, 10, 13, 5, 8, 12, 15, 7, 11, 14, 16,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_col_iscan_4x4[16]) = {
  1, 4, 8, 12, 2, 6, 10, 13, 3, 7, 11, 15, 5, 9, 14, 16,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_row_iscan_4x4[16]) = {
  1, 2, 4, 6, 3, 5, 7, 10, 8, 9, 12, 14, 11, 13, 15, 16,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_col_iscan_8x8[64]) = {
  1,  4,  9,  16, 23, 33, 41, 48, 2,  6,  12, 19, 27, 35, 45, 52,
  3,  8,  14, 21, 29, 39, 47, 55, 5,  11, 17, 25, 32, 42, 51, 57,
  7,  13, 22, 28, 36, 44, 53, 59, 10, 18, 26, 34, 40, 49, 56, 61,
  15, 24, 31, 38, 46, 54, 60, 63, 20, 30, 37, 43, 50, 58, 62, 64,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_row_iscan_8x8[64]) = {
  1,  2,  3,  6,  9,  13, 20, 25, 4,  5,  8,  11, 16, 21, 31, 40,
  7,  10, 14, 17, 22, 28, 38, 47, 12, 15, 18, 24, 29, 35, 45, 53,
  19, 23, 26, 32, 36, 42, 51, 58, 27, 30, 34, 39, 44, 50, 56, 60,
  33, 37, 43, 48, 52, 55, 61, 62, 41, 46, 49, 54, 57, 59, 63, 64,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_default_iscan_8x8[64]) = {
  1,  3,  6,  10, 15, 23, 32, 38, 2,  5,  9,  14, 20, 27, 39, 45,
  4,  7,  11, 18, 25, 31, 43, 50, 8,  12, 16, 22, 30, 37, 48, 54,
  13, 17, 21, 28, 35, 44, 53, 58, 19, 24, 29, 36, 42, 49, 57, 61,
  26, 33, 40, 46, 51, 56, 60, 63, 34, 41, 47, 52, 55, 59, 62, 64,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_col_iscan_16x16[256]) = {
  1,  5,  12,  21,  32,  44,  60,  76,  86,  110, 131, 151, 166, 182, 196, 199,
  2,  7,  15,  24,  35,  48,  65,  82,  96,  115, 136, 154, 172, 189, 202, 213,
  3,  9,  17,  26,  39,  53,  68,  84,  102, 117, 137, 158, 173, 191, 206, 217,
  4,  11, 19,  30,  42,  56,  72,  90,  104, 120, 142, 160, 177, 195, 209, 219,
  6,  13, 22,  33,  46,  59,  75,  94,  105, 124, 145, 165, 180, 197, 211, 224,
  8,  16, 27,  38,  50,  64,  79,  97,  113, 130, 147, 167, 183, 201, 216, 229,
  10, 20, 29,  40,  55,  70,  87,  103, 118, 133, 152, 171, 188, 207, 221, 231,
  14, 25, 36,  47,  61,  74,  92,  109, 123, 138, 155, 175, 190, 208, 225, 236,
  18, 31, 41,  54,  67,  83,  99,  116, 127, 143, 162, 181, 198, 214, 228, 238,
  23, 37, 49,  63,  77,  93,  106, 121, 134, 148, 168, 187, 204, 220, 233, 241,
  28, 45, 57,  71,  85,  100, 114, 128, 141, 157, 176, 194, 210, 227, 237, 245,
  34, 52, 69,  80,  95,  111, 126, 139, 150, 163, 185, 203, 218, 230, 242, 248,
  43, 62, 78,  91,  107, 122, 135, 149, 161, 174, 192, 212, 226, 239, 246, 252,
  51, 73, 88,  101, 119, 129, 146, 159, 169, 184, 205, 223, 234, 243, 250, 254,
  58, 81, 98,  112, 132, 144, 156, 170, 179, 193, 215, 232, 240, 247, 251, 255,
  66, 89, 108, 125, 140, 153, 164, 178, 186, 200, 222, 235, 244, 249, 253, 256,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_row_iscan_16x16[256]) = {
  1,   2,   3,   5,   7,   10,  13,  18,  23,  30,  37,  44,  55,  65,  77,
  87,  4,   6,   8,   12,  16,  20,  26,  33,  39,  49,  60,  69,  85,  100,
  116, 131, 9,   11,  14,  19,  24,  28,  34,  43,  52,  61,  73,  89,  104,
  120, 143, 168, 15,  17,  21,  27,  32,  38,  45,  54,  62,  74,  86,  101,
  117, 136, 162, 186, 22,  25,  31,  36,  41,  48,  56,  66,  75,  82,  95,
  113, 134, 155, 180, 206, 29,  35,  40,  46,  51,  59,  68,  78,  88,  97,
  107, 122, 147, 170, 197, 213, 42,  47,  50,  57,  64,  71,  80,  91,  99,
  108, 123, 139, 160, 183, 208, 223, 53,  58,  63,  70,  76,  84,  94,  103,
  111, 121, 135, 151, 177, 196, 216, 227, 67,  72,  79,  83,  92,  98,  109,
  114, 128, 137, 149, 169, 189, 203, 222, 233, 81,  90,  93,  102, 106, 115,
  126, 132, 140, 152, 163, 178, 193, 209, 224, 235, 96,  105, 110, 118, 124,
  129, 144, 145, 156, 166, 176, 191, 207, 220, 234, 240, 112, 119, 125, 130,
  141, 148, 158, 165, 171, 182, 192, 204, 225, 231, 241, 244, 127, 133, 138,
  146, 154, 161, 175, 179, 185, 198, 205, 217, 232, 238, 245, 247, 142, 150,
  157, 167, 173, 181, 190, 200, 201, 211, 221, 229, 239, 243, 250, 252, 153,
  164, 172, 184, 187, 194, 202, 212, 215, 219, 228, 237, 246, 248, 253, 254,
  159, 174, 188, 195, 199, 210, 214, 218, 226, 230, 236, 242, 249, 251, 255,
  256,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_default_iscan_16x16[256]) = {
  1,   3,   6,   10,  18,  25,  37,  45,  56,  73,  89,  105, 129, 144, 167,
  180, 2,   5,   9,   14,  21,  31,  41,  55,  67,  80,  97,  114, 142, 155,
  179, 197, 4,   8,   12,  19,  26,  34,  47,  58,  72,  87,  102, 120, 149,
  165, 187, 202, 7,   13,  17,  24,  32,  40,  54,  65,  79,  93,  111, 128,
  154, 170, 194, 209, 11,  15,  20,  29,  38,  48,  59,  68,  85,  99,  115,
  134, 162, 177, 199, 215, 16,  22,  27,  35,  44,  53,  66,  78,  92,  107,
  121, 141, 166, 186, 206, 222, 23,  28,  33,  42,  49,  61,  74,  86,  100,
  117, 131, 152, 176, 191, 212, 226, 30,  36,  43,  50,  60,  70,  82,  96,
  109, 126, 140, 156, 183, 198, 218, 230, 39,  46,  52,  62,  69,  81,  94,
  106, 119, 135, 151, 169, 192, 208, 224, 235, 51,  57,  64,  75,  84,  95,
  110, 118, 130, 148, 164, 178, 200, 214, 229, 239, 63,  71,  77,  88,  98,
  108, 123, 132, 146, 160, 173, 189, 211, 223, 236, 243, 76,  83,  91,  103,
  113, 125, 139, 147, 158, 174, 188, 203, 220, 231, 241, 246, 90,  101, 112,
  124, 133, 143, 157, 168, 181, 190, 204, 217, 232, 238, 247, 251, 104, 116,
  127, 137, 150, 163, 172, 184, 195, 205, 216, 225, 237, 242, 249, 253, 122,
  136, 145, 159, 171, 182, 193, 201, 210, 219, 228, 234, 244, 245, 252, 255,
  138, 153, 161, 175, 185, 196, 207, 213, 221, 227, 233, 240, 248, 250, 254,
  256,
};

DECLARE_ALIGNED(16, static const int16_t, vp9_default_iscan_32x32[1024]) = {
  1,    3,    6,    11,   18,   26,   39,   48,   63,   84,   102,  122,  146,
  171,  194,  205,  211,  220,  230,  234,  246,  258,  276,  300,  343,  357,
  378,  406,  456,  472,  496,  528,  2,    5,    9,    16,   23,   31,   46,
  59,   75,   93,   113,  134,  159,  185,  204,  216,  223,  229,  235,  238,
  257,  275,  299,  318,  356,  377,  405,  427,  471,  495,  527,  552,  4,
  8,    13,   19,   29,   37,   53,   65,   83,   103,  119,  143,  165,  190,
  209,  218,  225,  232,  236,  239,  274,  298,  317,  330,  376,  404,  426,
  441,  494,  526,  551,  568,  7,    12,   17,   24,   32,   44,   61,   74,
  91,   110,  127,  151,  174,  197,  212,  221,  227,  233,  237,  240,  297,
  316,  329,  336,  403,  425,  440,  448,  525,  550,  567,  576,  10,   15,
  20,   30,   38,   51,   66,   79,   96,   117,  135,  158,  180,  202,  215,
  224,  245,  256,  273,  296,  342,  355,  375,  402,  455,  470,  493,  524,
  583,  597,  618,  646,  14,   21,   27,   36,   45,   55,   73,   86,   106,
  124,  141,  164,  183,  206,  217,  226,  255,  272,  295,  315,  354,  374,
  401,  424,  469,  492,  523,  549,  596,  617,  645,  667,  22,   28,   34,
  43,   54,   64,   81,   95,   114,  133,  152,  173,  191,  210,  219,  228,
  271,  294,  314,  328,  373,  400,  423,  439,  491,  522,  548,  566,  616,
  644,  666,  681,  25,   33,   40,   49,   58,   72,   89,   105,  121,  140,
  160,  179,  198,  213,  222,  231,  293,  313,  327,  335,  399,  422,  438,
  447,  521,  547,  565,  575,  643,  665,  680,  688,  35,   41,   47,   57,
  69,   82,   97,   112,  131,  148,  168,  187,  244,  254,  270,  292,  341,
  353,  372,  398,  454,  468,  490,  520,  582,  595,  615,  642,  694,  706,
  724,  748,  42,   50,   56,   68,   78,   92,   108,  125,  139,  162,  178,
  195,  253,  269,  291,  312,  352,  371,  397,  421,  467,  489,  519,  546,
  594,  614,  641,  664,  705,  723,  747,  766,  52,   60,   67,   77,   90,
  100,  120,  132,  150,  169,  182,  201,  268,  290,  311,  326,  370,  396,
  420,  437,  488,  518,  545,  564,  613,  640,  663,  679,  722,  746,  765,
  778,  62,   70,   76,   88,   101,  115,  130,  145,  163,  181,  192,  208,
  289,  310,  325,  334,  395,  419,  436,  446,  517,  544,  563,  574,  639,
  662,  678,  687,  745,  764,  777,  784,  71,   80,   87,   98,   109,  123,
  138,  156,  243,  252,  267,  288,  340,  351,  369,  394,  453,  466,  487,
  516,  581,  593,  612,  638,  693,  704,  721,  744,  789,  799,  814,  834,
  85,   94,   104,  111,  126,  142,  155,  172,  251,  266,  287,  309,  350,
  368,  393,  418,  465,  486,  515,  543,  592,  611,  637,  661,  703,  720,
  743,  763,  798,  813,  833,  849,  99,   107,  116,  128,  144,  157,  170,
  186,  265,  286,  308,  324,  367,  392,  417,  435,  485,  514,  542,  562,
  610,  636,  660,  677,  719,  742,  762,  776,  812,  832,  848,  859,  118,
  129,  137,  149,  161,  176,  189,  199,  285,  307,  323,  333,  391,  416,
  434,  445,  513,  541,  561,  573,  635,  659,  676,  686,  741,  761,  775,
  783,  831,  847,  858,  864,  136,  147,  153,  166,  242,  250,  264,  284,
  339,  349,  366,  390,  452,  464,  484,  512,  580,  591,  609,  634,  692,
  702,  718,  740,  788,  797,  811,  830,  868,  876,  888,  904,  154,  167,
  175,  184,  249,  263,  283,  306,  348,  365,  389,  415,  463,  483,  511,
  540,  590,  608,  633,  658,  701,  717,  739,  760,  796,  810,  829,  846,
  875,  887,  903,  916,  177,  188,  196,  203,  262,  282,  305,  322,  364,
  388,  414,  433,  482,  510,  539,  560,  607,  632,  657,  675,  716,  738,
  759,  774,  809,  828,  845,  857,  886,  902,  915,  924,  193,  200,  207,
  214,  281,  304,  321,  332,  387,  413,  432,  444,  509,  538,  559,  572,
  631,  656,  674,  685,  737,  758,  773,  782,  827,  844,  856,  863,  901,
  914,  923,  928,  241,  248,  261,  280,  338,  347,  363,  386,  451,  462,
  481,  508,  579,  589,  606,  630,  691,  700,  715,  736,  787,  795,  808,
  826,  867,  874,  885,  900,  931,  937,  946,  958,  247,  260,  279,  303,
  346,  362,  385,  412,  461,  480,  507,  537,  588,  605,  629,  655,  699,
  714,  735,  757,  794,  807,  825,  843,  873,  884,  899,  913,  936,  945,
  957,  967,  259,  278,  302,  320,  361,  384,  411,  431,  479,  506,  536,
  558,  604,  628,  654,  673,  713,  734,  756,  772,  806,  824,  842,  855,
  883,  898,  912,  922,  944,  956,  966,  973,  277,  301,  319,  331,  383,
  410,  430,  443,  505,  535,  557,  571,  627,  653,  672,  684,  733,  755,
  771,  781,  823,  841,  854,  862,  897,  911,  921,  927,  955,  965,  972,
  976,  337,  345,  360,  382,  450,  460,  478,  504,  578,  587,  603,  626,
  690,  698,  712,  732,  786,  793,  805,  822,  866,  872,  882,  896,  930,
  935,  943,  954,  978,  982,  988,  996,  344,  359,  381,  409,  459,  477,
  503,  534,  586,  602,  625,  652,  697,  711,  731,  754,  792,  804,  821,
  840,  871,  881,  895,  910,  934,  942,  953,  964,  981,  987,  995,  1002,
  358,  380,  408,  429,  476,  502,  533,  556,  601,  624,  651,  671,  710,
  730,  753,  770,  803,  820,  839,  853,  880,  894,  909,  920,  941,  952,
  963,  971,  986,  994,  1001, 1006, 379,  407,  428,  442,  501,  532,  555,
  570,  623,  650,  670,  683,  729,  752,  769,  780,  819,  838,  852,  861,
  893,  908,  919,  926,  951,  962,  970,  975,  993,  1000, 1005, 1008, 449,
  458,  475,  500,  577,  585,  600,  622,  689,  696,  709,  728,  785,  791,
  802,  818,  865,  870,  879,  892,  929,  933,  940,  950,  977,  980,  985,
  992,  1009, 1011, 1014, 1018, 457,  474,  499,  531,  584,  599,  621,  649,
  695,  708,  727,  751,  790,  801,  817,  837,  869,  878,  891,  907,  932,
  939,  949,  961,  979,  984,  991,  999,  1010, 1013, 1017, 1021, 473,  498,
  530,  554,  598,  620,  648,  669,  707,  726,  750,  768,  800,  816,  836,
  851,  877,  890,  906,  918,  938,  948,  960,  969,  983,  990,  998,  1004,
  1012, 1016, 1020, 1023, 497,  529,  553,  569,  619,  647,  668,  682,  725,
  749,  767,  779,  815,  835,  850,  860,  889,  905,  917,  925,  947,  959,
  968,  974,  989,  997,  1003, 1007, 1015, 1019, 1022, 1024,
};

const ScanOrder vp9_default_scan_orders[TX_SIZES] = {
  { default_scan_4x4, vp9_default_iscan_4x4, default_scan_4x4_neighbors },
  { default_scan_8x8, vp9_default_iscan_8x8, default_scan_8x8_neighbors },
  { default_scan_16x16, vp9_default_iscan_16x16, default_scan_16x16_neighbors },
  { default_scan_32x32, vp9_default_iscan_32x32, default_scan_32x32_neighbors },
};

const ScanOrder vp9_scan_orders[TX_SIZES][TX_TYPES] = {
  { // TX_4X4
    { default_scan_4x4, vp9_default_iscan_4x4, default_scan_4x4_neighbors },
    { row_scan_4x4, vp9_row_iscan_4x4, row_scan_4x4_neighbors },
    { col_scan_4x4, vp9_col_iscan_4x4, col_scan_4x4_neighbors },
    { default_scan_4x4, vp9_default_iscan_4x4, default_scan_4x4_neighbors } },
  { // TX_8X8
    { default_scan_8x8, vp9_default_iscan_8x8, default_scan_8x8_neighbors },
    { row_scan_8x8, vp9_row_iscan_8x8, row_scan_8x8_neighbors },
    { col_scan_8x8, vp9_col_iscan_8x8, col_scan_8x8_neighbors },
    { default_scan_8x8, vp9_default_iscan_8x8, default_scan_8x8_neighbors } },
  { // TX_16X16
    { default_scan_16x16, vp9_default_iscan_16x16,
      default_scan_16x16_neighbors },
    { row_scan_16x16, vp9_row_iscan_16x16, row_scan_16x16_neighbors },
    { col_scan_16x16, vp9_col_iscan_16x16, col_scan_16x16_neighbors },
    { default_scan_16x16, vp9_default_iscan_16x16,
      default_scan_16x16_neighbors } },
  { // TX_32X32
    { default_scan_32x32, vp9_default_iscan_32x32,
      default_scan_32x32_neighbors },
    { default_scan_32x32, vp9_default_iscan_32x32,
      default_scan_32x32_neighbors },
    { default_scan_32x32, vp9_default_iscan_32x32,
      default_scan_32x32_neighbors },
    { default_scan_32x32, vp9_default_iscan_32x32,
      default_scan_32x32_neighbors } }
};