2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
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32 #include "opj_includes.h"
35 /* This table contains the norms of the basis function of the reversible MCT. */
37 static const double mct_norms[3] = { 1.732, .8292, .8292 };
40 /* This table contains the norms of the basis function of the irreversible MCT. */
42 static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 };
45 /* Foward reversible MCT. */
47 void mct_encode(int *c0, int *c1, int *c2, int n) {
49 for (i = 0; i < n; i++) {
54 y = (r + (g << 1) + b) >> 2;
64 /* Inverse reversible MCT. */
66 void mct_decode(int *c0, int *c1, int *c2, int n) {
68 for (i = 0; i < n; i++) {
73 g = y - ((u + v) >> 2);
83 /* Get norm of basis function of reversible MCT. */
85 double mct_getnorm(int compno) {
86 return mct_norms[compno];
90 /* Foward irreversible MCT. */
92 void mct_encode_real(int *c0, int *c1, int *c2, int n) {
94 for (i = 0; i < n; i++) {
99 y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
100 u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
101 v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
109 /* Inverse irreversible MCT. */
111 void mct_decode_real(int *c0, int *c1, int *c2, int n) {
113 for (i = 0; i < n; i++) {
114 int y, u, v, r, g, b;
118 r = y + fix_mul(v, 11485);
119 g = y - fix_mul(u, 2819) - fix_mul(v, 5850);
120 b = y + fix_mul(u, 14516);
128 /* Get norm of basis function of irreversible MCT. */
130 double mct_getnorm_real(int compno) {
131 return mct_norms_real[compno];