2 * Copyright (c) 2001-2003, David Janssens
3 * Copyright (c) 2002-2003, Yannick Verschueren
4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
5 * Copyright (c) 2005, Hervé Drolon, FreeImage Team
6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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31 #include "opj_includes.h"
34 /* This table contains the norms of the basis function of the reversible MCT. */
36 static const double mct_norms[3] = { 1.732, .8292, .8292 };
39 /* This table contains the norms of the basis function of the irreversible MCT. */
41 static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 };
44 /* Foward reversible MCT. */
46 void mct_encode(int *c0, int *c1, int *c2, int n) {
48 for (i = 0; i < n; i++) {
53 y = (r + (g << 1) + b) >> 2;
63 /* Inverse reversible MCT. */
65 void mct_decode(int *c0, int *c1, int *c2, int n) {
67 for (i = 0; i < n; i++) {
72 g = y - ((u + v) >> 2);
82 /* Get norm of basis function of reversible MCT. */
84 double mct_getnorm(int compno) {
85 return mct_norms[compno];
89 /* Foward irreversible MCT. */
91 void mct_encode_real(int *c0, int *c1, int *c2, int n) {
93 for (i = 0; i < n; i++) {
98 y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
99 u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
100 v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
108 /* Inverse irreversible MCT. */
110 void mct_decode_real(int *c0, int *c1, int *c2, int n) {
112 for (i = 0; i < n; i++) {
113 int y, u, v, r, g, b;
117 r = y + fix_mul(v, 11485);
118 g = y - fix_mul(u, 2819) - fix_mul(v, 5850);
119 b = y + fix_mul(u, 14516);
127 /* Get norm of basis function of irreversible MCT. */
129 double mct_getnorm_real(int compno) {
130 return mct_norms_real[compno];