/* | |
* Copyright (c) 2001-2003, David Janssens | |
* Copyright (c) 2002-2003, Yannick Verschueren | |
* Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe | |
* Copyright (c) 2005, Herve Drolon, FreeImage Team | |
* Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* 1. Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* 2. Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' | |
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
* POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#include "opj_includes.h" | |
/* <summary> */ | |
/* This table contains the norms of the basis function of the reversible MCT. */ | |
/* </summary> */ | |
static const double mct_norms[3] = { 1.732, .8292, .8292 }; | |
/* <summary> */ | |
/* This table contains the norms of the basis function of the irreversible MCT. */ | |
/* </summary> */ | |
static const double mct_norms_real[3] = { 1.732, 1.805, 1.573 }; | |
/* <summary> */ | |
/* Foward reversible MCT. */ | |
/* </summary> */ | |
void mct_encode(int *c0, int *c1, int *c2, int n) { | |
int i; | |
for (i = 0; i < n; i++) { | |
int r, g, b, y, u, v; | |
r = c0[i]; | |
g = c1[i]; | |
b = c2[i]; | |
y = (r + (g << 1) + b) >> 2; | |
u = b - g; | |
v = r - g; | |
c0[i] = y; | |
c1[i] = u; | |
c2[i] = v; | |
} | |
} | |
/* <summary> */ | |
/* Inverse reversible MCT. */ | |
/* </summary> */ | |
void mct_decode(int *c0, int *c1, int *c2, int n) { | |
int i; | |
for (i = 0; i < n; i++) { | |
int y, u, v, r, g, b; | |
y = c0[i]; | |
u = c1[i]; | |
v = c2[i]; | |
g = y - ((u + v) >> 2); | |
r = v + g; | |
b = u + g; | |
c0[i] = r; | |
c1[i] = g; | |
c2[i] = b; | |
} | |
} | |
/* <summary> */ | |
/* Get norm of basis function of reversible MCT. */ | |
/* </summary> */ | |
double mct_getnorm(int compno) { | |
return mct_norms[compno]; | |
} | |
/* <summary> */ | |
/* Foward irreversible MCT. */ | |
/* </summary> */ | |
void mct_encode_real(int *c0, int *c1, int *c2, int n) { | |
int i; | |
for (i = 0; i < n; i++) { | |
int r, g, b, y, u, v; | |
r = c0[i]; | |
g = c1[i]; | |
b = c2[i]; | |
y = fix_mul(r, 2449) + fix_mul(g, 4809) + fix_mul(b, 934); | |
u = -fix_mul(r, 1382) - fix_mul(g, 2714) + fix_mul(b, 4096); | |
v = fix_mul(r, 4096) - fix_mul(g, 3430) - fix_mul(b, 666); | |
c0[i] = y; | |
c1[i] = u; | |
c2[i] = v; | |
} | |
} | |
/* <summary> */ | |
/* Inverse irreversible MCT. */ | |
/* </summary> */ | |
void mct_decode_real(int *c0, int *c1, int *c2, int n) { | |
int i; | |
for (i = 0; i < n; i++) { | |
int y, u, v, r, g, b; | |
y = c0[i]; | |
u = c1[i]; | |
v = c2[i]; | |
r = y + fix_mul(v, 11485); | |
g = y - fix_mul(u, 2819) - fix_mul(v, 5850); | |
b = y + fix_mul(u, 14516); | |
c0[i] = r; | |
c1[i] = g; | |
c2[i] = b; | |
} | |
} | |
/* <summary> */ | |
/* Get norm of basis function of irreversible MCT. */ | |
/* </summary> */ | |
double mct_getnorm_real(int compno) { | |
return mct_norms_real[compno]; | |
} |