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funcs.c
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funcs.c
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/*
This file is part of "Filter Foundry", a filter plugin for Adobe Photoshop
Copyright (C) 2003-2009 Toby Thain, [email protected]
Copyright (C) 2018-2023 Daniel Marschall, ViaThinkSoft
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef MAC_ENV
#include <fp.h>
#endif
#include <math.h>
#include <stdlib.h>
#ifndef PARSERTEST
#include "ff.h"
#else
#define uint8_t unsigned char
#define uint16_t unsigned short
#define uint32_t unsigned int
#define int32_t int
#endif
#include "funcs.h"
#include "y.tab.h"
#include "node.h" // for symbol "var[]"
#define RINT //no rounding for now
//#if TARGET_API_MAC_CARBON
// this is another incompatibility between Classic stdclib and OS X stdclib
// ***FIXME: need to access real OS X includes for Carbon build
//#undef RAND_MAX
//#define RAND_MAX 0x7fffffff
//#endif
const int FACTORY_COS_LOOKUP[1024] = {
16384, 16383, 16382, 16381, 16379, 16376, 16372, 16368, 16364, 16359, 16353, 16346, 16339, 16331, 16323,
16314, 16305, 16294, 16284, 16272, 16260, 16248, 16234, 16221, 16206, 16191, 16175, 16159, 16142, 16125,
16107, 16088, 16069, 16049, 16028, 16007, 15985, 15963, 15940, 15917, 15893, 15868, 15842, 15817, 15790,
15763, 15735, 15707, 15678, 15649, 15618, 15588, 15557, 15525, 15492, 15459, 15426, 15392, 15357, 15322,
15286, 15249, 15212, 15175, 15136, 15098, 15058, 15018, 14978, 14937, 14895, 14853, 14811, 14767, 14723,
14679, 14634, 14589, 14543, 14496, 14449, 14401, 14353, 14304, 14255, 14205, 14155, 14104, 14053, 14001,
13948, 13895, 13842, 13788, 13733, 13678, 13622, 13566, 13510, 13452, 13395, 13337, 13278, 13219, 13159,
13099, 13039, 12977, 12916, 12854, 12791, 12728, 12665, 12601, 12536, 12471, 12406, 12340, 12273, 12207,
12139, 12072, 12003, 11935, 11866, 11796, 11726, 11656, 11585, 11513, 11442, 11370, 11297, 11224, 11151,
11077, 11003, 10928, 10853, 10777, 10701, 10625, 10548, 10471, 10394, 10316, 10237, 10159, 10080, 10000,
9920, 9840, 9760, 9679, 9597, 9516, 9434, 9351, 9269, 9186, 9102, 9018, 8934, 8850, 8765, 8680, 8595,
8509, 8423, 8336, 8250, 8163, 8075, 7988, 7900, 7812, 7723, 7634, 7545, 7456, 7366, 7276, 7186, 7096,
7005, 6914, 6822, 6731, 6639, 6547, 6455, 6362, 6270, 6176, 6083, 5990, 5896, 5802, 5708, 5614, 5519,
5424, 5329, 5234, 5139, 5043, 4948, 4852, 4756, 4659, 4563, 4466, 4369, 4273, 4175, 4078, 3981, 3883,
3785, 3687, 3589, 3491, 3393, 3295, 3196, 3097, 2998, 2900, 2801, 2702, 2602, 2503, 2404, 2304, 2205,
2105, 2005, 1905, 1806, 1706, 1606, 1505, 1405, 1305, 1205, 1105, 1004, 904, 804, 703, 603, 502, 402,
301, 201, 100, -100, -201, -301, -402, -502, -603, -703, -804, -904, -1004, -1105, -1205, -1305, -1405,
-1505, -1606, -1706, -1806, -1905, -2005, -2105, -2205, -2304, -2404, -2503, -2602, -2702, -2801, -2900,
-2998, -3097, -3196, -3295, -3393, -3491, -3589, -3687, -3785, -3883, -3981, -4078, -4175, -4273, -4369,
-4466, -4563, -4659, -4756, -4852, -4948, -5043, -5139, -5234, -5329, -5424, -5519, -5614, -5708, -5802,
-5896, -5990, -6083, -6176, -6270, -6362, -6455, -6547, -6639, -6731, -6822, -6914, -7005, -7096, -7186,
-7276, -7366, -7456, -7545, -7634, -7723, -7812, -7900, -7988, -8075, -8163, -8250, -8336, -8423, -8509,
-8595, -8680, -8765, -8850, -8934, -9018, -9102, -9186, -9269, -9351, -9434, -9516, -9597, -9679, -9760,
-9840, -9920, -10000, -10080, -10159, -10237, -10316, -10394, -10471, -10548, -10625, -10701, -10777,
-10853, -10928, -11003, -11077, -11151, -11224, -11297, -11370, -11442, -11513, -11585, -11656, -11726,
-11796, -11866, -11935, -12003, -12072, -12139, -12207, -12273, -12340, -12406, -12471, -12536, -12601,
-12665, -12728, -12791, -12854, -12916, -12977, -13039, -13099, -13159, -13219, -13278, -13337, -13395,
-13452, -13510, -13566, -13622, -13678, -13733, -13788, -13842, -13895, -13948, -14001, -14053, -14104,
-14155, -14205, -14255, -14304, -14353, -14401, -14449, -14496, -14543, -14589, -14634, -14679, -14723,
-14767, -14811, -14853, -14895, -14937, -14978, -15018, -15058, -15098, -15136, -15175, -15212, -15249,
-15286, -15322, -15357, -15392, -15426, -15459, -15492, -15525, -15557, -15588, -15618, -15649, -15678,
-15707, -15735, -15763, -15790, -15817, -15842, -15868, -15893, -15917, -15940, -15963, -15985, -16007,
-16028, -16049, -16069, -16088, -16107, -16125, -16142, -16159, -16175, -16191, -16206, -16221, -16234,
-16248, -16260, -16272, -16284, -16294, -16305, -16314, -16323, -16331, -16339, -16346, -16353, -16359,
-16364, -16368, -16372, -16376, -16379, -16381, -16382, -16383, -16384, -16384, -16383, -16382, -16381,
-16379, -16376, -16372, -16368, -16364, -16359, -16353, -16346, -16339, -16331, -16323, -16314, -16305,
-16294, -16284, -16272, -16260, -16248, -16234, -16221, -16206, -16191, -16175, -16159, -16142, -16125,
-16107, -16088, -16069, -16049, -16028, -16007, -15985, -15963, -15940, -15917, -15893, -15868, -15842,
-15817, -15790, -15763, -15735, -15707, -15678, -15649, -15618, -15588, -15557, -15525, -15492, -15459,
-15426, -15392, -15357, -15322, -15286, -15249, -15212, -15175, -15136, -15098, -15058, -15018, -14978,
-14937, -14895, -14853, -14811, -14767, -14723, -14679, -14634, -14589, -14543, -14496, -14449, -14401,
-14353, -14304, -14255, -14205, -14155, -14104, -14053, -14001, -13948, -13895, -13842, -13788, -13733,
-13678, -13622, -13566, -13510, -13452, -13395, -13337, -13278, -13219, -13159, -13099, -13039, -12977,
-12916, -12854, -12791, -12728, -12665, -12601, -12536, -12471, -12406, -12340, -12273, -12207, -12139,
-12072, -12003, -11935, -11866, -11796, -11726, -11656, -11585, -11513, -11442, -11370, -11297, -11224,
-11151, -11077, -11003, -10928, -10853, -10777, -10701, -10625, -10548, -10471, -10394, -10316, -10237,
-10159, -10080, -10000, -9920, -9840, -9760, -9679, -9597, -9516, -9434, -9351, -9269, -9186, -9102,
-9018, -8934, -8850, -8765, -8680, -8595, -8509, -8423, -8336, -8250, -8163, -8075, -7988, -7900, -7812,
-7723, -7634, -7545, -7456, -7366, -7276, -7186, -7096, -7005, -6914, -6822, -6731, -6639, -6547, -6455,
-6362, -6270, -6176, -6083, -5990, -5896, -5802, -5708, -5614, -5519, -5424, -5329, -5234, -5139, -5043,
-4948, -4852, -4756, -4659, -4563, -4466, -4369, -4273, -4175, -4078, -3981, -3883, -3785, -3687, -3589,
-3491, -3393, -3295, -3196, -3097, -2998, -2900, -2801, -2702, -2602, -2503, -2404, -2304, -2205, -2105,
-2005, -1905, -1806, -1706, -1606, -1505, -1405, -1305, -1205, -1105, -1004, -904, -804, -703, -603, -502,
-402, -301, -201, -100, 100, 201, 301, 402, 502, 603, 703, 804, 904, 1004, 1105, 1205, 1305, 1405, 1505,
1606, 1706, 1806, 1905, 2005, 2105, 2205, 2304, 2404, 2503, 2602, 2702, 2801, 2900, 2998, 3097, 3196,
3295, 3393, 3491, 3589, 3687, 3785, 3883, 3981, 4078, 4175, 4273, 4369, 4466, 4563, 4659, 4756, 4852,
4948, 5043, 5139, 5234, 5329, 5424, 5519, 5614, 5708, 5802, 5896, 5990, 6083, 6176, 6270, 6362, 6455,
6547, 6639, 6731, 6822, 6914, 7005, 7096, 7186, 7276, 7366, 7456, 7545, 7634, 7723, 7812, 7900, 7988,
8075, 8163, 8250, 8336, 8423, 8509, 8595, 8680, 8765, 8850, 8934, 9018, 9102, 9186, 9269, 9351, 9434,
9516, 9597, 9679, 9760, 9840, 9920, 10000, 10080, 10159, 10237, 10316, 10394, 10471, 10548, 10625, 10701,
10777, 10853, 10928, 11003, 11077, 11151, 11224, 11297, 11370, 11442, 11513, 11585, 11656, 11726, 11796,
11866, 11935, 12003, 12072, 12139, 12207, 12273, 12340, 12406, 12471, 12536, 12601, 12665, 12728, 12791,
12854, 12916, 12977, 13039, 13099, 13159, 13219, 13278, 13337, 13395, 13452, 13510, 13566, 13622, 13678,
13733, 13788, 13842, 13895, 13948, 14001, 14053, 14104, 14155, 14205, 14255, 14304, 14353, 14401, 14449,
14496, 14543, 14589, 14634, 14679, 14723, 14767, 14811, 14853, 14895, 14937, 14978, 15018, 15058, 15098,
15136, 15175, 15212, 15249, 15286, 15322, 15357, 15392, 15426, 15459, 15492, 15525, 15557, 15588, 15618,
15649, 15678, 15707, 15735, 15763, 15790, 15817, 15842, 15868, 15893, 15917, 15940, 15963, 15985, 16007,
16028, 16049, 16069, 16088, 16107, 16125, 16142, 16159, 16175, 16191, 16206, 16221, 16234, 16248, 16260,
16272, 16284, 16294, 16305, 16314, 16323, 16331, 16339, 16346, 16353, 16359, 16364, 16368, 16372, 16376,
16379, 16381, 16382, 16383, 16384 };
const uint16_t FACTORY_C2D_LOOKUP[1024] = {
64, 128, 191, 255, 319, 383, 447, 511, 575, 639, 703, 767, 831, 895, 959, 1023, 1087, 1151, 1215, 1279,
1343, 1407, 1471, 1535, 1599, 1663, 1727, 1791, 1855, 1919, 1983, 2047, 2111, 2175, 2239, 2303, 2366,
2430, 2494, 2558, 2622, 2686, 2750, 2814, 2878, 2942, 3005, 3069, 3133, 3197, 3261, 3325, 3388, 3452,
3516, 3580, 3644, 3708, 3771, 3835, 3899, 3963, 4026, 4090, 4154, 4218, 4281, 4345, 4409, 4473, 4536,
4600, 4664, 4727, 4791, 4855, 4918, 4982, 5046, 5109, 5173, 5236, 5300, 5364, 5427, 5491, 5554, 5618,
5681, 5745, 5808, 5872, 5935, 5999, 6062, 6126, 6189, 6252, 6316, 6379, 6443, 6506, 6569, 6633, 6696,
6759, 6823, 6886, 6949, 7013, 7076, 7139, 7202, 7266, 7329, 7392, 7455, 7518, 7582, 7645, 7708, 7771,
7834, 7897, 7960, 8023, 8086, 8149, 8212, 8275, 8338, 8401, 8464, 8527, 8590, 8653, 8716, 8779, 8841,
8904, 8967, 9030, 9093, 9155, 9218, 9281, 9344, 9406, 9469, 9532, 9594, 9657, 9720, 9782, 9845, 9907,
9970, 10032, 10095, 10157, 10220, 10282, 10345, 10407, 10470, 10532, 10594, 10657, 10719, 10781, 10843,
10906, 10968, 11030, 11092, 11155, 11217, 11279, 11341, 11403, 11465, 11527, 11589, 11651, 11713, 11775,
11837, 11899, 11961, 12023, 12085, 12146, 12208, 12270, 12332, 12394, 12455, 12517, 12579, 12640, 12702,
12764, 12825, 12887, 12948, 13010, 13071, 13133, 13194, 13256, 13317, 13379, 13440, 13501, 13563, 13624,
13685, 13746, 13808, 13869, 13930, 13991, 14052, 14113, 14174, 14235, 14296, 14357, 14418, 14479, 14540,
14601, 14662, 14723, 14784, 14844, 14905, 14966, 15027, 15087, 15148, 15208, 15269, 15330, 15390, 15451,
15511, 15572, 15632, 15693, 15753, 15813, 15874, 15934, 15994, 16054, 16115, 16175, 16235, 16295, 16355,
16415, 16475, 16535, 16595, 16655, 16715, 16775, 16835, 16895, 16955, 17015, 17074, 17134, 17194, 17254,
17313, 17373, 17432, 17492, 17551, 17611, 17670, 17730, 17789, 17849, 17908, 17967, 18027, 18086, 18145,
18204, 18264, 18323, 18382, 18441, 18500, 18559, 18618, 18677, 18736, 18795, 18854, 18912, 18971, 19030,
19089, 19147, 19206, 19265, 19323, 19382, 19440, 19499, 19557, 19616, 19674, 19733, 19791, 19849, 19908,
19966, 20024, 20082, 20141, 20199, 20257, 20315, 20373, 20431, 20489, 20547, 20605, 20663, 20720, 20778,
20836, 20894, 20951, 21009, 21067, 21124, 21182, 21239, 21297, 21354, 21412, 21469, 21526, 21584, 21641,
21698, 21756, 21813, 21870, 21927, 21984, 22041, 22098, 22155, 22212, 22269, 22326, 22383, 22439, 22496,
22553, 22610, 22666, 22723, 22780, 22836, 22893, 22949, 23006, 23062, 23118, 23175, 23231, 23287, 23344,
23400, 23456, 23512, 23568, 23624, 23680, 23736, 23792, 23848, 23904, 23960, 24016, 24071, 24127, 24183,
24238, 24294, 24350, 24405, 24461, 24516, 24572, 24627, 24682, 24738, 24793, 24848, 24904, 24959, 25014,
25069, 25124, 25179, 25234, 25289, 25344, 25399, 25454, 25509, 25563, 25618, 25673, 25727, 25782, 25836,
25891, 25945, 26000, 26054, 26109, 26163, 26217, 26271, 26326, 26380, 26434, 26488, 26542, 26596, 26650,
26704, 26758, 26812, 26866, 26920, 26974, 27027, 27081, 27135, 27188, 27242, 27295, 27349, 27402, 27456,
27509, 27563, 27616, 27669, 27722, 27776, 27829, 27882, 27935, 27988, 28041, 28094, 28147, 28200, 28253,
28305, 28358, 28411, 28464, 28516, 28569, 28621, 28674, 28726, 28779, 28831, 28884, 28936, 28988, 29041,
29093, 29145, 29197, 29249, 29301, 29353, 29405, 29457, 29509, 29561, 29613, 29664, 29716, 29768, 29820,
29871, 29923, 29974, 30026, 30077, 30129, 30180, 30231, 30283, 30334, 30385, 30436, 30488, 30539, 30590,
30641, 30692, 30743, 30794, 30844, 30895, 30946, 30997, 31047, 31098, 31149, 31199, 31250, 31300, 31351,
31401, 31452, 31502, 31552, 31602, 31653, 31703, 31753, 31803, 31853, 31903, 31953, 32003, 32053, 32103,
32153, 32202, 32252, 32302, 32351, 32401, 32451, 32500, 32550, 32599, 32649, 32698, 32747, 32796, 32846,
32895, 32944, 32993, 33042, 33091, 33140, 33189, 33238, 33287, 33336, 33385, 33434, 33482, 33531, 33580,
33628, 33677, 33725, 33774, 33822, 33871, 33919, 33967, 34015, 34064, 34112, 34160, 34208, 34256, 34304,
34352, 34400, 34448, 34496, 34544, 34592, 34639, 34687, 34735, 34782, 34830, 34877, 34925, 34972, 35020,
35067, 35115, 35162, 35209, 35256, 35303, 35351, 35398, 35445, 35492, 35539, 35586, 35633, 35679, 35726,
35773, 35820, 35866, 35913, 35960, 36006, 36053, 36099, 36146, 36192, 36239, 36285, 36331, 36377, 36424,
36470, 36516, 36562, 36608, 36654, 36700, 36746, 36792, 36838, 36883, 36929, 36975, 37021, 37066, 37112,
37157, 37203, 37248, 37294, 37339, 37385, 37430, 37475, 37520, 37566, 37611, 37656, 37701, 37746, 37791,
37836, 37881, 37926, 37971, 38015, 38060, 38105, 38149, 38194, 38239, 38283, 38328, 38372, 38417, 38461,
38505, 38550, 38594, 38638, 38682, 38727, 38771, 38815, 38859, 38903, 38947, 38991, 39035, 39078, 39122,
39166, 39210, 39253, 39297, 39341, 39384, 39428, 39471, 39515, 39558, 39601, 39645, 39688, 39731, 39774,
39818, 39861, 39904, 39947, 39990, 40033, 40076, 40119, 40161, 40204, 40247, 40290, 40332, 40375, 40418,
40460, 40503, 40545, 40588, 40630, 40673, 40715, 40757, 40799, 40842, 40884, 40926, 40968, 41010, 41052,
41094, 41136, 41178, 41220, 41262, 41303, 41345, 41387, 41429, 41470, 41512, 41553, 41595, 41636, 41678,
41719, 41761, 41802, 41843, 41885, 41926, 41967, 42008, 42049, 42090, 42131, 42172, 42213, 42254, 42295,
42336, 42376, 42417, 42458, 42499, 42539, 42580, 42620, 42661, 42701, 42742, 42782, 42823, 42863, 42903,
42944, 42984, 43024, 43064, 43104, 43144, 43184, 43224, 43264, 43304, 43344, 43384, 43424, 43463, 43503,
43543, 43582, 43622, 43662, 43701, 43741, 43780, 43820, 43859, 43898, 43938, 43977, 44016, 44055, 44094,
44134, 44173, 44212, 44251, 44290, 44329, 44368, 44406, 44445, 44484, 44523, 44562, 44600, 44639, 44677,
44716, 44755, 44793, 44832, 44870, 44908, 44947, 44985, 45023, 45062, 45100, 45138, 45176, 45214, 45252,
45290, 45328, 45366, 45404, 45442, 45480, 45518, 45555, 45593, 45631, 45668, 45706, 45744, 45781, 45819,
45856, 45894, 45931, 45968, 46006, 46043, 46080, 46117, 46155, 46192, 46229, 46266, 46303, 46340, 46377,
46414, 46451, 46488, 46525, 46561, 46598, 46635, 46672, 46708, 46745, 46781, 46818, 46854, 46891, 46927,
46964, 47000, 47037, 47073, 47109, 47145, 47182, 47218, 47254, 47290, 47326, 47362, 47398, 47434, 47470,
47506, 47542, 47577, 47613, 47649, 47685, 47720, 47756, 47792, 47827, 47863, 47898, 47934, 47969, 48004,
48040, 48075, 48110, 48146, 48181, 48216, 48251, 48286, 48322, 48357, 48392, 48427, 48462, 48496, 48531,
48566, 48601, 48636, 48671, 48705, 48740, 48775, 48809, 48844, 48878, 48913, 48947, 48982, 49016, 49051,
49085, 49119, 49154, 49188, 49222, 49256, 49290, 49324, 49359, 49393, 49427, 49461, 49495, 49528, 49562,
49596, 49630, 49664, 49698, 49731, 49765, 49799, 49832, 49866, 49899, 49933, 49966, 50000, 50033, 50067,
50100, 50133, 50167, 50200, 50233, 50266, 50299, 50333, 50366, 50399, 50432, 50465, 50498, 50531, 50564,
50597, 50629, 50662, 50695, 50728, 50760, 50793, 50826, 50858, 50891, 50924, 50956, 50989, 51021, 51053,
51086, 51118, 51151, 51183, 51215, 51247, 51280, 51312, 51344, 51376, 51408, 51440, 51472 };
const uint16_t FACTORY_C2M_LOOKUP[1024] = {
32, 32, 32, 32, 32, 32, 33, 33, 33, 34, 35, 35, 36, 37, 38, 39, 39, 41, 42, 43, 44, 45, 47, 48, 49, 51,
53, 54, 56, 58, 60, 62, 63, 66, 68, 70, 72, 74, 77, 79, 81, 84, 87, 89, 92, 95, 98, 100, 103, 106, 110,
113, 116, 119, 123, 126, 129, 133, 137, 140, 144, 148, 152, 155, 159, 163, 167, 172, 176, 180, 184, 189,
193, 198, 202, 207, 212, 217, 221, 226, 231, 236, 241, 246, 252, 257, 262, 268, 273, 279, 284, 290, 295,
301, 307, 313, 319, 325, 331, 337, 343, 350, 356, 362, 369, 375, 382, 388, 395, 402, 409, 415, 422, 429,
436, 443, 451, 458, 465, 473, 480, 487, 495, 503, 510, 518, 526, 534, 542, 549, 558, 566, 574, 582, 590,
599, 607, 615, 624, 633, 641, 650, 659, 667, 676, 685, 694, 703, 712, 722, 731, 740, 750, 759, 768, 778,
788, 797, 807, 817, 827, 837, 847, 857, 867, 877, 887, 897, 908, 918, 928, 939, 950, 960, 971, 982, 992,
1003, 1014, 1025, 1036, 1047, 1059, 1070, 1081, 1092, 1104, 1115, 1127, 1138, 1150, 1162, 1174, 1185, 1197,
1209, 1221, 1233, 1245, 1258, 1270, 1282, 1294, 1307, 1319, 1332, 1344, 1357, 1370, 1383, 1395, 1408, 1421,
1434, 1447, 1460, 1474, 1487, 1500, 1514, 1527, 1540, 1554, 1568, 1581, 1595, 1609, 1622, 1636, 1650, 1664,
1678, 1692, 1707, 1721, 1735, 1749, 1764, 1778, 1793, 1807, 1822, 1837, 1852, 1866, 1881, 1896, 1911, 1926,
1941, 1956, 1972, 1987, 2002, 2018, 2033, 2048, 2064, 2080, 2095, 2111, 2127, 2143, 2159, 2174, 2190, 2207,
2223, 2239, 2255, 2271, 2288, 2304, 2321, 2337, 2354, 2370, 2387, 2404, 2420, 2437, 2454, 2471, 2488, 2505,
2522, 2540, 2557, 2574, 2592, 2609, 2626, 2644, 2662, 2679, 2697, 2715, 2732, 2750, 2768, 2786, 2804, 2822,
2840, 2859, 2877, 2895, 2913, 2932, 2950, 2969, 2987, 3006, 3025, 3043, 3062, 3081, 3100, 3119, 3138, 3157,
3176, 3195, 3214, 3234, 3253, 3272, 3292, 3311, 3331, 3351, 3370, 3390, 3410, 3430, 3449, 3469, 3489, 3509,
3529, 3550, 3570, 3590, 3610, 3631, 3651, 3672, 3692, 3713, 3733, 3754, 3775, 3795, 3816, 3837, 3858, 3879,
3900, 3921, 3942, 3964, 3985, 4006, 4027, 4049, 4070, 4092, 4113, 4135, 4157, 4178, 4200, 4222, 4244, 4266,
4288, 4310, 4332, 4354, 4376, 4399, 4421, 4443, 4466, 4488, 4510, 4533, 4556, 4578, 4601, 4624, 4647, 4669,
4692, 4715, 4738, 4761, 4784, 4808, 4831, 4854, 4877, 4901, 4924, 4948, 4971, 4995, 5018, 5042, 5066, 5089,
5113, 5137, 5161, 5185, 5209, 5233, 5257, 5281, 5306, 5330, 5354, 5378, 5403, 5427, 5452, 5476, 5501, 5526,
5550, 5575, 5600, 5625, 5650, 5675, 5700, 5725, 5750, 5775, 5800, 5825, 5851, 5876, 5901, 5927, 5952, 5978,
6003, 6029, 6055, 6080, 6106, 6132, 6158, 6184, 6210, 6236, 6262, 6288, 6314, 6340, 6367, 6393, 6419, 6446,
6472, 6499, 6525, 6552, 6578, 6605, 6632, 6658, 6685, 6712, 6739, 6766, 6793, 6820, 6847, 6874, 6901, 6929,
6956, 6983, 7011, 7038, 7066, 7093, 7121, 7148, 7176, 7204, 7231, 7259, 7287, 7315, 7343, 7371, 7399, 7427,
7455, 7483, 7511, 7539, 7568, 7596, 7624, 7653, 7681, 7710, 7738, 7767, 7796, 7824, 7853, 7882, 7911, 7940,
7968, 7997, 8026, 8055, 8085, 8114, 8143, 8172, 8201, 8231, 8260, 8289, 8319, 8348, 8378, 8407, 8437, 8467,
8496, 8526, 8556, 8586, 8616, 8646, 8675, 8705, 8736, 8766, 8796, 8826, 8856, 8886, 8917, 8947, 8977, 9008,
9038, 9069, 9099, 9130, 9161, 9191, 9222, 9253, 9284, 9315, 9345, 9376, 9407, 9438, 9469, 9501, 9532, 9563,
9594, 9625, 9657, 9688, 9719, 9751, 9782, 9814, 9845, 9877, 9909, 9940, 9972, 10004, 10036, 10068, 10099,
10131, 10163, 10195, 10227, 10259, 10292, 10324, 10356, 10388, 10421, 10453, 10485, 10518, 10550, 10583,
10615, 10648, 10680, 10713, 10746, 10778, 10811, 10844, 10877, 10910, 10943, 10976, 11009, 11042, 11075,
11108, 11141, 11174, 11208, 11241, 11274, 11308, 11341, 11374, 11408, 11441, 11475, 11509, 11542, 11576,
11610, 11643, 11677, 11711, 11745, 11779, 11813, 11847, 11881, 11915, 11949, 11983, 12017, 12051, 12085,
12120, 12154, 12188, 12223, 12257, 12292, 12326, 12361, 12395, 12430, 12465, 12499, 12534, 12569, 12604,
12638, 12673, 12708, 12743, 12778, 12813, 12848, 12883, 12918, 12954, 12989, 13024, 13059, 13095, 13130,
13165, 13201, 13236, 13272, 13307, 13343, 13379, 13414, 13450, 13486, 13521, 13557, 13593, 13629, 13665,
13701, 13736, 13772, 13809, 13845, 13881, 13917, 13953, 13989, 14025, 14062, 14098, 14134, 14171, 14207,
14244, 14280, 14317, 14353, 14390, 14426, 14463, 14500, 14536, 14573, 14610, 14647, 14684, 14721, 14758,
14794, 14831, 14869, 14906, 14943, 14980, 15017, 15054, 15091, 15129, 15166, 15203, 15241, 15278, 15316,
15353, 15391, 15428, 15466, 15503, 15541, 15579, 15616, 15654, 15692, 15730, 15767, 15805, 15843, 15881,
15919, 15957, 15995, 16033, 16071, 16109, 16147, 16186, 16224, 16262, 16300, 16339, 16377, 16416, 16454,
16492, 16531, 16569, 16608, 16646, 16685, 16724, 16762, 16801, 16840, 16879, 16917, 16956, 16995, 17034,
17073, 17112, 17151, 17190, 17229, 17268, 17307, 17346, 17385, 17425, 17464, 17503, 17542, 17582, 17621,
17660, 17700, 17739, 17779, 17818, 17858, 17897, 17937, 17977, 18016, 18056, 18096, 18135, 18175, 18215,
18255, 18295, 18335, 18375, 18415, 18455, 18495, 18535, 18575, 18615, 18655, 18695, 18735, 18776, 18816,
18856, 18896, 18937, 18977, 19017, 19058, 19098, 19139, 19179, 19220, 19260, 19301, 19342, 19382, 19423,
19464, 19505, 19545, 19586, 19627, 19668, 19709, 19750, 19791, 19832, 19873, 19914, 19955, 19996, 20037,
20078, 20119, 20160, 20202, 20243, 20284, 20325, 20367, 20408, 20450, 20491, 20532, 20574, 20615, 20657,
20699, 20740, 20782, 20823, 20865, 20907, 20949, 20990, 21032, 21074, 21116, 21158, 21199, 21241, 21283,
21325, 21367, 21409, 21451, 21493, 21536, 21578, 21620, 21662, 21704, 21746, 21789, 21831, 21873, 21916,
21958, 22000, 22043, 22085, 22128, 22170, 22213, 22255, 22298, 22341, 22383, 22426, 22468, 22511, 22554,
22597, 22639, 22682, 22725, 22768, 22811, 22854, 22897, 22940, 22983, 23026, 23069, 23112, 23155, 23198,
23241, 23284, 23328, 23371, 23414, 23457, 23501, 23544, 23587, 23631, 23674, 23717, 23761, 23804, 23848,
23891, 23935, 23978, 24022, 24066, 24109, 24153, 24197, 24240, 24284, 24328, 24372, 24415, 24459, 24503,
24547, 24591, 24635, 24679, 24723, 24767, 24811, 24855, 24899, 24943, 24987, 25031, 25075, 25120, 25164,
25208, 25252, 25297, 25341, 25385, 25430, 25474, 25518, 25563, 25607, 25652, 25696, 25741, 25785, 25830,
25874, 25919, 25964, 26008, 26053, 26098, 26142, 26187, 26232, 26277, 26322, 26366, 26411, 26456, 26501,
26546, 26591, 26636, 26681, 26726, 26771, 26816, 26861, 26906, 26951, 26997, 27042, 27087, 27132 };
// -------------------------------------------------------------------------------------------
extern value_type cell[], var[];
extern unsigned char* image_ptr;
// -------------------------------------------------------------------------------------------
void init_trigtab(void) {
#ifdef PARSERTEST
return;
#else
int i;
if (gdata == NULL) return; // should not happen
if (gdata->costab == NULL) {
gdata->costab = (double*)malloc(sizeof(double) * COSTABSIZE);
if (gdata->costab) {
for (i = 0; i < COSTABSIZE; ++i) {
gdata->costab[i] = cos(FFANGLE(i));
}
}
}
if (gdata->tantab == NULL) {
gdata->tantab = (double*)malloc(sizeof(double) * TANTABSIZE);
if (gdata->tantab) {
for (i = 0; i < TANTABSIZE; ++i) {
if (i >= TANTABSIZE / 2) {
/* the last '-1' in the expression '512-i-1' is for FilterFactory compatibility, and to avoid the undefined pi/2 area */
gdata->tantab[i] = -gdata->tantab[TANTABSIZE - i - 1];
}
else {
gdata->tantab[i] = tan(FFANGLE(i));
}
}
}
}
#endif
}
// -------------------------------------------------------------------------------------------
/**
Channel z for the input pixel at coordinates x,y.
Coordinates are relative to the input image data (pb->inData)
*/
static value_type rawsrc(value_type x, value_type y, value_type z) {
#ifdef PARSERTEST
return 0;
#else
if (HAS_BIG_DOC(gpb)) {
if (x < BIGDOC_IN_RECT(gpb).left)
x = BIGDOC_IN_RECT(gpb).left;
else if (x >= BIGDOC_IN_RECT(gpb).right)
x = BIGDOC_IN_RECT(gpb).right - 1;
if (y < BIGDOC_IN_RECT(gpb).top)
y = BIGDOC_IN_RECT(gpb).top;
else if (y >= BIGDOC_IN_RECT(gpb).bottom)
y = BIGDOC_IN_RECT(gpb).bottom - 1;
return ((unsigned char*)gpb->inData)[(long)gpb->inRowBytes * (y - BIGDOC_IN_RECT(gpb).top)
+ (long)nplanes * (x - BIGDOC_IN_RECT(gpb).left) + z];
} else {
if (x < IN_RECT(gpb).left)
x = IN_RECT(gpb).left;
else if (x >= IN_RECT(gpb).right)
x = IN_RECT(gpb).right - 1;
if (y < IN_RECT(gpb).top)
y = IN_RECT(gpb).top;
else if (y >= IN_RECT(gpb).bottom)
y = IN_RECT(gpb).bottom - 1;
return ((unsigned char*)gpb->inData)[(long)gpb->inRowBytes * (y - IN_RECT(gpb).top)
+ (long)nplanes * (x - IN_RECT(gpb).left) + z];
}
#endif
}
// -------------------------------------------------------------------------------------------
/**
src(x, y, z) Channel z for the pixel at coordinates x, y.
Coordinates are relative to filtered area (selection).
*/
value_type ff_src(value_type x, value_type y, value_type z) {
#ifdef PARSERTEST
return 0;
#else
if (z < 0 || z >= var['Z']) return 0;
if (x < 0)
x = 0;
else if (x >= var['X'])
x = var['X'] - 1;
if (y < 0)
y = 0;
else if (y >= var['Y'])
y = var['Y'] - 1;
return image_ptr[(long)gpb->inRowBytes * y + (long)nplanes * x + z];
#endif
}
// -------------------------------------------------------------------------------------------
value_type factory_r2x(value_type d, value_type m) {
// https://misc.daniel-marschall.de/projects/filter_factory/function_r2x.html
#ifdef PARSERTEST
return 0;
#else
int eax = m;
int ebx = d;
ebx &= 1023;
ebx = FACTORY_COS_LOOKUP[ebx];
return (((int64_t)eax * (int64_t)ebx) + 8191) >> 14;
#endif
}
value_type foundry_r2x(value_type d, value_type m) {
#ifdef PARSERTEST
return 0;
#else
return (value_type)RINT(m * gdata->costab[abs(d) % COSTABSIZE]);
#endif
}
/**
r2x(d,m) x displacement of the pixel m units away, at an angle of d,
from an arbitrary center
*/
value_type ff_r2x(value_type d, value_type m) {
#ifdef use_filterfactory_implementation_r2x
return factory_r2x(d, m);
#else
return foundry_r2x(d, m);
#endif
}
// -------------------------------------------------------------------------------------------
value_type factory_r2y(value_type d, value_type m) {
#ifdef PARSERTEST
return 0;
#else
// https://misc.daniel-marschall.de/projects/filter_factory/function_r2y.html
return factory_r2x(d - 256, m);
#endif
}
value_type foundry_r2y(value_type d, value_type m) {
#ifdef PARSERTEST
return 0;
#else
return (value_type)RINT(m * gdata->costab[abs(d - 256) % COSTABSIZE]);
#endif
}
/**
r2y(d,m) y displacement of the pixel m units away, at an angle of d,
from an arbitrary center
*/
value_type ff_r2y(value_type d, value_type m) {
#ifdef use_filterfactory_implementation_r2y
return factory_r2y(d, m);
#else
return foundry_r2y(d, m);
#endif
}
// -------------------------------------------------------------------------------------------
value_type factory_rad(value_type d, value_type m, value_type z) {
#ifdef PARSERTEST
return 0;
#else
// https://misc.daniel-marschall.de/projects/filter_factory/function_rad.html
const int xmin = 0;
const int ymin = 0;
const int zmin = 0;
int eax, ebx, ecx;
ebx = FACTORY_COS_LOOKUP[d & 1023];
eax = (((int64_t)m * (int64_t)ebx) + 8191) >> 14;
ecx = ((var['X'] - xmin) >> 1) + eax;
if (ecx < 0) {
ecx = 0;
}
else {
eax = var['X'];
if (ecx >= eax) {
ecx = eax - 1;
}
}
ebx = FACTORY_COS_LOOKUP[(d - 256) & 1023];
eax = (((int64_t)m * (int64_t)ebx) + 8191) >> 14;
ebx = ((var['Y'] - ymin) >> 1) + eax;
if (ebx < 0) {
ebx = 0;
}
else {
eax = var['Y'];
if (ebx >= eax) {
ebx = eax - 1;
}
}
// Now return pixel [x=ecx,y=ebx,z=esi] from the source image!
//return ff_src(ecx, ebx, z);
ebx *= gpb->inRowBytes;
ecx *= var['Z'] - zmin;
return image_ptr[z + ebx + ecx];
#endif
}
value_type foundry_rad(value_type d, value_type m, value_type z) {
#ifdef PARSERTEST
return 0;
#else
return ff_src(foundry_r2x(d, m) + var['X'] / 2, foundry_r2y(d, m) + var['Y'] / 2, z);
#endif
}
/**
rad(d,m,z) Channel z in the source image, which is m units away,
at an angle of d, from the center of the image
*/
value_type ff_rad(value_type d, value_type m, value_type z) {
#ifdef use_filterfactory_implementation_rad
return factory_rad(d, m, z);
#else
return foundry_rad(d, m, z);
#endif
}
// -------------------------------------------------------------------------------------------
/**
ctl(i) Value of slider i, where i is an integer between 0 and 7, inclusive
*/
value_type ff_ctl(value_type i) {
#ifdef PARSERTEST
return 0;
#else
return i >= 0 && i <= 7 ? gdata->parm.val[i] : 0;
#endif
}
// -------------------------------------------------------------------------------------------
value_type val_factory(value_type i, value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
if (i < 0 || i > 7) return 0;
return ((long)(gdata->parm.val[i]) * (b - a)) / 255 + a;
#endif
}
/**
The only difference between `val_factory()` and `val_foundry()` is the handling of invalid values of "i"
*/
value_type val_foundry(value_type i, value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
return ((long)ff_ctl(i) * (b - a)) / 255 + a;
#endif
}
/*
val(i,a,b) Value of slider i, mapped onto the range a to b
*/
value_type ff_val(value_type i, value_type a, value_type b) {
#ifdef use_filterfactory_implementation_val
return val_factory(i, a, b);
#else
return val_foundry(i, a, b);
#endif
}
// -------------------------------------------------------------------------------------------
/*
map(i,n) Item n from mapping table i, where i is an integer between
0 and 3, inclusive, and n is and integer between 0 and 255,
inclusive
*/
value_type ff_map(value_type i, value_type n) {
#ifdef PARSERTEST
return 0;
#else
value_type H, L;
const int i2 = i << 1;
// This is how Filter Factory for Windows implements it:
if (i < 0) return 0;
if (i > 3) return 0;
H = gdata->parm.val[i2]; // ctl(2i)
L = gdata->parm.val[i2 + 1]; // ctl(2i+1)
if (n < 0) n = 0;
if (n > 255) n = 255; // Note: MacFF probably does "return 255" if n>255 (see testcases/map1_factory_win.png)
if (H == L) {
// This is undocumented in Filter Factory! (Taken from Windows implementation)
if (n < H) return 0;
if (n >= L) return 255;
} else if (L > H) {
// This is undocumented in Filter Factory! (Taken from Windows implementation)
if (n <= H) return 255;
if (n >= L) return 0;
} else {
if (n <= L) return 0;
if (n >= H) return 255;
}
return (n - L) * 255 / (H - L);
// This is the original formula used by GIMP User Filter v0.8 (uf-pcode.h).
// It was used in Filter Foundry till version 1.7.0.16, inclusive.
/*
value_type H = ff_ctl(i * 2);
value_type L = ff_ctl(i * 2 + 1);
return abs(((long)n * (L - H) / 255) + H);
*/
#endif
}
// -------------------------------------------------------------------------------------------
/**
min(a,b) Lesser of a and b
*/
value_type ff_min(value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
return a < b ? a : b;
#endif
}
// -------------------------------------------------------------------------------------------
/**
max(a,b) Greater of a and b
*/
value_type ff_max(value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
return a > b ? a : b;
#endif
}
// -------------------------------------------------------------------------------------------
/**
abs(a) Absolute value of a
*/
value_type ff_abs(value_type a) {
#ifdef PARSERTEST
return 0;
#else
return abs(a);
#endif
}
// -------------------------------------------------------------------------------------------
/**
add(a,b,c) Sum of a and b, or c, whichever is lesser
*/
value_type ff_add(value_type a, value_type b, value_type c) {
#ifdef PARSERTEST
return 0;
#else
return ff_min(a + b, c);
#endif
}
// -------------------------------------------------------------------------------------------
/**
sub(a,b,c) Difference of a and b, or c, whichever is greater
*/
value_type ff_sub(value_type a, value_type b, value_type c) {
#ifdef PARSERTEST
return 0;
#else
return ff_max(ff_dif(a, b), c);
#endif
}
// -------------------------------------------------------------------------------------------
/**
dif(a,b) Absolute value of the difference of a and b
*/
value_type ff_dif(value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
return abs(a - b);
#endif
}
// -------------------------------------------------------------------------------------------
struct factoryRngState {
uint16_t index1;
uint16_t index2;
uint32_t seedTable[56];
uint32_t seed;
uint32_t seedSave;
} gFactoryRngState;
void factory_fill_rnd_lookup(uint32_t seed, struct factoryRngState* state) {
#ifdef PARSERTEST
return;
#else
// Algorithm of Filter Factory
// Filter Factory uses Donald E.Knuth's subtractive
// random number generator algorithm ("ran3"), which has been published
// in Page 283 of "The Art of Computer Programming, volume 2: Seminumerical Algorithms",
// Addison-Wesley, Reading, MA, second edition, 1981.
// https://www.cec.uchile.cl/cinetica/pcordero/MC_libros/NumericalRecipesinC.pdf (PDF Page 307)
long mj, mk;
int i, ii, k;
// 161803398 = 1.61803398 * 10^8 ~= phi * 10^8
mj = 161803398 - (seed & 0x7fff);
state->seedTable[55] = mj;
mk = 1;
ii = 0;
for (i = 1; i <= 54; ++i) {
if ((ii += 21) >= 55) ii -= 55; // ii = (21*i)%55;
state->seedTable[ii] = mk;
mk = mj - mk;
mj = state->seedTable[ii];
}
for (k = 1; k <= 4; ++k) {
ii = 30;
for (i = 1; i <= 55; ++i) {
if ((ii += 1) >= 55) ii -= 55;
state->seedTable[i] -= state->seedTable[1 + ii]; // 1 + (i+30)%55
}
}
state->seedSave = seed;
return;
#endif
}
uint32_t factory_rnd(uint32_t a, uint32_t b, struct factoryRngState* state) {
#ifdef PARSERTEST
return 0;
#else
uint32_t mj; // Note: This must be "uint32_t". With "long" (as described by Knuth), it won't match FilterFactory's algorithm
int range;
if (state->seed != state->seedSave) {
// (Intentional) behavior of Filter Foundry
factory_fill_rnd_lookup(state->seed, &gFactoryRngState);
state->index1 = 0;
state->index2 = 31;
}
// Algorithm of Filter Factory
// Filter Factory uses Donald E.Knuth's subtractive
// random number generator algorithm ("ran3"), which has been published
// in Page 283 of "The Art of Computer Programming, volume 2: Seminumerical Algorithms",
// Addison-Wesley, Reading, MA, second edition, 1981.
// https://www.cec.uchile.cl/cinetica/pcordero/MC_libros/NumericalRecipesinC.pdf (PDF Page 307)
if (++state->index1 == 56) state->index1 = 1;
if (++state->index2 == 56) state->index2 = 1;
mj = state->seedTable[state->index1] -
state->seedTable[state->index2];
state->seedTable[state->index1] = mj;
// This is Filter Factory specific:
// Reduce result into interval [a..b] by applying (a + (mj % (b - a + 1))
// Try to avoid modulo in order to increase performance
range = b - a;
if (range < 0) return 0;
switch (range) {
case 255:
return a + (mj & 0xFF);
case 127:
return a + (mj & 0x7F);
case 63:
return a + (mj & 0x3F);
case 31:
return a + (mj & 0x1F);
case 15:
return a + (mj & 0xF);
case 7:
return a + (mj & 0x7);
case 3:
return a + (mj & 0x3);
case 1:
return a + (mj & 0x1);
case 0:
return a;
default:
return a + (mj % (range + 1));
}
#endif
}
value_type foundry_rnd(value_type a, value_type b) {
#ifdef PARSERTEST
return 0;
#else
return (int)((abs(a - b) + 1) * (rand() / (RAND_MAX + 1.))) + ff_min(a, b);
// return ((unsigned)rand() % (ff_dif(a,b)+1)) + ff_min(a,b);
#endif
}
/**
rnd(a,b) Random number between a and b, inclusive
*/
value_type ff_rnd(value_type a, value_type b) {
#ifdef use_filterfactory_implementation_rnd
return factory_rnd(a, b, &gFactoryRngState);
#else
return foundry_rnd(a, b);
#endif
}
// -------------------------------------------------------------------------------------------
int32_t factory_rst(uint32_t seed, struct factoryRngState* state) {
#ifdef PARSERTEST
return 0;
#else
// Attention: This is NOT the FilterFactory rst() implementation!
// We implement rst(i) completely differently in Filter Foundry:
// Every call of rst() will renew the lookup table.
// In Filter Factory, there are strange/buggy things going
// on: rst(i) only sets a seed and the lookup table is renewed
// at the NEXT invocation of the filter. Furthermore, in FilterFactory,
// the state is not reset between invocations, therefore, the preview image
// will influence the PRNG state of the final image...
// More information at "Filter Factory Compatibility.md"
state->seed = seed;
// Force renewal of the PRNG state in the next rnd(a,b) call.
// This allows us to use:
// (x==0?rst(1):0), rnd(0,255)
// But it is slower and this won't work anymore:
// rst(0), rnd(0,255)
state->seedSave = seed + 1;
return 0;
#endif
}
value_type foundry_rst(value_type seed) {
#ifdef PARSERTEST
return 0;
#else
srand(seed);
return 0;
#endif
}
/**
rst(i) sets a random seed and returns 0. (undocumented Filter Factory function).
Added by Daniel Marschall, 18 Dec 2018
*/
value_type ff_rst(value_type seed) {
#ifdef use_filterfactory_implementation_rnd
return factory_rst(seed, &gFactoryRngState);
#else
return foundry_rst(seed);
#endif
}
// -------------------------------------------------------------------------------------------
void factory_initialize_rnd_variables(void) {
#ifdef PARSERTEST
return;
#else
gFactoryRngState.seed = 0; // default seed
gFactoryRngState.seedSave = gFactoryRngState.seed + 1; // force rnd() to call factory_fill_rnd_lookup()
#endif
}
void foundry_initialize_rnd_variables(void) {
#ifdef PARSERTEST
return;
#else
foundry_rst(691204);
#endif
}
void initialize_rnd_variables(void) {
#ifdef use_filterfactory_implementation_rnd
factory_initialize_rnd_variables();
#else
foundry_initialize_rnd_variables();
#endif
}
// -------------------------------------------------------------------------------------------
/**
mix(a,b,n,d) Mixture of a and b by fraction n/d, a*n/d+b*(d-n)/d
*/
value_type ff_mix(value_type a, value_type b, value_type n, value_type d) {
#ifdef PARSERTEST
return 0;
#else
if (d == 0) return 0;
return ((long)a * n) / d + ((long)b * (d - n)) / d;
#endif
}
// -------------------------------------------------------------------------------------------
/**
scl(a,il,ih,ol,oh) Scale a from input range (il to ih)
to output range (ol to oh) */
value_type ff_scl(value_type a, value_type il, value_type ih,
value_type ol, value_type oh) {
#ifdef PARSERTEST
return 0;
#else
return ih == il ? 0 : ol + ((long)(oh - ol) * (a - il)) / (ih - il);
#endif
}
// -------------------------------------------------------------------------------------------
/**
pow(b,e) Calculates the base to the exponent power, that is, b^e.
Added by Daniel Marschall.
*/
value_type ff_pow(value_type b, value_type e) {
#ifdef PARSERTEST
return 0;
#else
double a = pow((double)b, (double)e);
if (a - floor(a) >= 0.5)
return (value_type)(floor(a) + 1);
else
return (value_type)(floor(a));
#endif
}
// -------------------------------------------------------------------------------------------
static uint32_t isqrt(uint32_t x) {
#ifdef PARSERTEST
return 0;
#else
// based on https://gist.github.com/orlp/3481770
static uint32_t lkpSquares[65535];
static int lkpInitialized = 0;
const uint32_t* p;
int i;
while (lkpInitialized == 1) { /* If other thread is currently creating the lookup table, then wait */ }
if (!lkpInitialized) {
lkpInitialized = 1;
for (i = 0; i < 65535; ++i) {
lkpSquares[i] = i * i;
}
lkpInitialized = 2;
}
p = lkpSquares;
if (p[32768] <= x) p += 32768;
if (p[16384] <= x) p += 16384;
if (p[8192] <= x) p += 8192;
if (p[4096] <= x) p += 4096;
if (p[2048] <= x) p += 2048;
if (p[1024] <= x) p += 1024;
if (p[512] <= x) p += 512;
if (p[256] <= x) p += 256;
if (p[128] <= x) p += 128;
if (p[64] <= x) p += 64;
if (p[32] <= x) p += 32;
if (p[16] <= x) p += 16;
if (p[8] <= x) p += 8;
if (p[4] <= x) p += 4;
if (p[2] <= x) p += 2;
if (p[1] <= x) p += 1;
return (uint32_t)(p - lkpSquares);
#endif
}
value_type factory_sqr(value_type x) {
#ifdef PARSERTEST
return 0;
#else
// https://misc.daniel-marschall.de/projects/filter_factory/function_sqr.html
int eax, ebx, ecx;
ebx = x;
if (ebx > 1) {
ecx = ebx;
ebx = ebx >> 1;
eax = 2;
while (ebx > eax) {
eax = ecx;
eax /= ebx;
ebx += eax;
ebx = ebx >> 1;
}
}
return ebx;
#endif
}
value_type foundry_sqr(value_type x) {
#ifdef PARSERTEST
return 0;
#else
// Note: FilterFactory has sqr(x)=x if x<0 . Here we set sqr(x)=0 for x<0
return x < 0 ? 0 : isqrt(x);
#endif
}
/**
sqr(x) Square root of x
*/
value_type ff_sqr(value_type x) {
#ifdef use_filterfactory_implementation_sqr
return factory_sqr(x);
#else
return foundry_sqr(x);
#endif
}