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8 * Copyright (c) 2002-2003, Yannick Verschueren
9 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
10 * Copyright (c) 2005, Herve Drolon, FreeImage Team
11 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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36 #include "opj_includes.h"
39 /* This table contains the norms of the basis function of the reversible MCT. */
41 static const double mct_norms[3] = { 1.732, .8292, .8292 };
44 /* This table contains the norms of the basis function of the irreversible MCT. */
46 static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 };
49 /* Forward reversible MCT. */
51 void mct_encode(int *c0, int *c1, int *c2, int n)
54 for (i = 0; i < n; i++) {
59 y = (r + (g << 1) + b) >> 2;
69 /* Inverse reversible MCT. */
71 void mct_decode(int *c0, int *c1, int *c2, int n)
74 for (i = 0; i < n; i++) {
79 g = y - ((u + v) >> 2);
89 /* Get norm of basis function of reversible MCT. */
91 double mct_getnorm(int compno)
93 return mct_norms[compno];
97 /* Forward irreversible MCT. */
99 void mct_encode_real(int *c0, int *c1, int *c2, int n)
102 for (i = 0; i < n; i++) {
103 int r, g, b, y, u, v;
107 y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934);
108 u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096);
109 v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666);
117 /* Inverse irreversible MCT. */
119 void mct_decode_real(int *c0, int *c1, int *c2, int n)
122 for (i = 0; i < n; i++) {
123 int y, u, v, r, g, b;
127 r = y + fix_mul(v, 11485);
128 g = y - fix_mul(u, 2819) - fix_mul(v, 5850);
129 b = y + fix_mul(u, 14516);
137 /* Get norm of basis function of irreversible MCT. */
139 double mct_getnorm_real(int compno)
141 return mct_norms_real[compno];