2 * Copyright (c) 2001-2003, David Janssens
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3 * Copyright (c) 2002-2003, Yannick Verschueren
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4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
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5 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
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6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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7 * All rights reserved.
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9 * Redistribution and use in source and binary forms, with or without
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10 * modification, are permitted provided that the following conditions
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12 * 1. Redistributions of source code must retain the above copyright
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13 * notice, this list of conditions and the following disclaimer.
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14 * 2. Redistributions in binary form must reproduce the above copyright
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15 * notice, this list of conditions and the following disclaimer in the
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16 * documentation and/or other materials provided with the distribution.
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18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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28 * POSSIBILITY OF SUCH DAMAGE.
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31 #include "opj_includes.h"
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34 /* This table contains the norms of the basis function of the reversible MCT. */
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36 static const double mct_norms[3] = { 1.732, .8292, .8292 };
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39 /* This table contains the norms of the basis function of the irreversible MCT. */
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41 static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 };
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44 /* Foward reversible MCT. */
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46 void mct_encode(int *c0, int *c1, int *c2, int n) {
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48 for (i = 0; i < n; i++) {
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49 int r, g, b, y, u, v;
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53 y = (r + (g << 1) + b) >> 2;
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63 /* Inverse reversible MCT. */
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65 void mct_decode(int *c0, int *c1, int *c2, int n) {
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67 for (i = 0; i < n; i++) {
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68 int y, u, v, r, g, b;
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72 g = y - ((u + v) >> 2);
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82 /* Get norm of basis function of reversible MCT. */
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84 double mct_getnorm(int compno) {
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85 return mct_norms[compno];
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89 /* Foward irreversible MCT. */
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91 void mct_encode_real(int *c0, int *c1, int *c2, int n) {
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93 for (i = 0; i < n; i++) {
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94 int r, g, b, y, u, v;
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98 y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
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99 u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
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100 v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
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108 /* Inverse irreversible MCT. */
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110 void mct_decode_real(int *c0, int *c1, int *c2, int n) {
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112 for (i = 0; i < n; i++) {
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113 int y, u, v, r, g, b;
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117 r = y + fix_mul(v, 11485);
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118 g = y - fix_mul(u, 2819) - fix_mul(v, 5850);
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119 b = y + fix_mul(u, 14516);
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127 /* Get norm of basis function of irreversible MCT. */
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129 double mct_getnorm_real(int compno) {
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130 return mct_norms_real[compno];
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