ref: 7cdf839293bf3c0b5c3f52d368635156530ddf85
dir: /jpc_mct.c/
/*
* Copyright (c) 1999-2000 Image Power, Inc. and the University of
* British Columbia.
* Copyright (c) 2001-2003 Michael David Adams.
* All rights reserved.
*/
/* __START_OF_JASPER_LICENSE__
*
* JasPer License Version 2.0
*
* Copyright (c) 2001-2006 Michael David Adams
* Copyright (c) 1999-2000 Image Power, Inc.
* Copyright (c) 1999-2000 The University of British Columbia
*
* All rights reserved.
*
* Permission is hereby granted, free of charge, to any person (the
* "User") obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* 1. The above copyright notices and this permission notice (which
* includes the disclaimer below) shall be included in all copies or
* substantial portions of the Software.
*
* 2. The name of a copyright holder shall not be used to endorse or
* promote products derived from the Software without specific prior
* written permission.
*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
*
* __END_OF_JASPER_LICENSE__
*/
/*
* Multicomponent Transform Code
*
* $Id$
*/
/******************************************************************************\
* Includes.
\******************************************************************************/
#include "jpc_mct.h"
#include "jpc_fix.h"
#include "jasper/jas_seq.h"
/******************************************************************************\
* Code.
\******************************************************************************/
/* Compute the forward RCT. */
void jpc_rct(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
{
int numrows;
int numcols;
int i;
int j;
jpc_fix_t *c0p;
jpc_fix_t *c1p;
jpc_fix_t *c2p;
numrows = jas_matrix_numrows(c0);
numcols = jas_matrix_numcols(c0);
/* All three matrices must have the same dimensions. */
assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numcols(c1) == numcols
&& jas_matrix_numrows(c2) == numrows && jas_matrix_numcols(c2) == numcols);
for (i = 0; i < numrows; i++) {
c0p = jas_matrix_getref(c0, i, 0);
c1p = jas_matrix_getref(c1, i, 0);
c2p = jas_matrix_getref(c2, i, 0);
for (j = numcols; j > 0; --j) {
int r;
int g;
int b;
int y;
int u;
int v;
r = *c0p;
g = *c1p;
b = *c2p;
//y = (r + (g << 1) + b) >> 2;
y = jpc_fix_asr(r + jpc_fix_asl(g, 1) + b, 2);
u = b - g;
v = r - g;
*c0p++ = y;
*c1p++ = u;
*c2p++ = v;
}
}
}
/* Compute the inverse RCT. */
void jpc_irct(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
{
int numrows;
int numcols;
int i;
int j;
jpc_fix_t *c0p;
jpc_fix_t *c1p;
jpc_fix_t *c2p;
numrows = jas_matrix_numrows(c0);
numcols = jas_matrix_numcols(c0);
/* All three matrices must have the same dimensions. */
assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numcols(c1) == numcols
&& jas_matrix_numrows(c2) == numrows && jas_matrix_numcols(c2) == numcols);
for (i = 0; i < numrows; i++) {
c0p = jas_matrix_getref(c0, i, 0);
c1p = jas_matrix_getref(c1, i, 0);
c2p = jas_matrix_getref(c2, i, 0);
for (j = numcols; j > 0; --j) {
int r;
int g;
int b;
int y;
int u;
int v;
y = *c0p;
u = *c1p;
v = *c2p;
//g = y - ((u + v) >> 2);
g = y - jpc_fix_asr(u + v, 2);
r = v + g;
b = u + g;
*c0p++ = r;
*c1p++ = g;
*c2p++ = b;
}
}
}
void jpc_ict(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
{
int numrows;
int numcols;
int i;
int j;
jpc_fix_t r;
jpc_fix_t g;
jpc_fix_t b;
jpc_fix_t y;
jpc_fix_t u;
jpc_fix_t v;
jpc_fix_t *c0p;
jpc_fix_t *c1p;
jpc_fix_t *c2p;
numrows = jas_matrix_numrows(c0);
assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numrows(c2) == numrows);
numcols = jas_matrix_numcols(c0);
assert(jas_matrix_numcols(c1) == numcols && jas_matrix_numcols(c2) == numcols);
for (i = 0; i < numrows; ++i) {
c0p = jas_matrix_getref(c0, i, 0);
c1p = jas_matrix_getref(c1, i, 0);
c2p = jas_matrix_getref(c2, i, 0);
for (j = numcols; j > 0; --j) {
r = *c0p;
g = *c1p;
b = *c2p;
y = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(0.299), r), jpc_fix_mul(jpc_dbltofix(0.587), g),
jpc_fix_mul(jpc_dbltofix(0.114), b));
u = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(-0.16875), r), jpc_fix_mul(jpc_dbltofix(-0.33126), g),
jpc_fix_mul(jpc_dbltofix(0.5), b));
v = jpc_fix_add3(jpc_fix_mul(jpc_dbltofix(0.5), r), jpc_fix_mul(jpc_dbltofix(-0.41869), g),
jpc_fix_mul(jpc_dbltofix(-0.08131), b));
*c0p++ = y;
*c1p++ = u;
*c2p++ = v;
}
}
}
void jpc_iict(jas_matrix_t *c0, jas_matrix_t *c1, jas_matrix_t *c2)
{
int numrows;
int numcols;
int i;
int j;
jpc_fix_t r;
jpc_fix_t g;
jpc_fix_t b;
jpc_fix_t y;
jpc_fix_t u;
jpc_fix_t v;
jpc_fix_t *c0p;
jpc_fix_t *c1p;
jpc_fix_t *c2p;
numrows = jas_matrix_numrows(c0);
assert(jas_matrix_numrows(c1) == numrows && jas_matrix_numrows(c2) == numrows);
numcols = jas_matrix_numcols(c0);
assert(jas_matrix_numcols(c1) == numcols && jas_matrix_numcols(c2) == numcols);
for (i = 0; i < numrows; ++i) {
c0p = jas_matrix_getref(c0, i, 0);
c1p = jas_matrix_getref(c1, i, 0);
c2p = jas_matrix_getref(c2, i, 0);
for (j = numcols; j > 0; --j) {
y = *c0p;
u = *c1p;
v = *c2p;
r = jpc_fix_add(y, jpc_fix_mul(jpc_dbltofix(1.402), v));
g = jpc_fix_add3(y, jpc_fix_mul(jpc_dbltofix(-0.34413), u),
jpc_fix_mul(jpc_dbltofix(-0.71414), v));
b = jpc_fix_add(y, jpc_fix_mul(jpc_dbltofix(1.772), u));
*c0p++ = r;
*c1p++ = g;
*c2p++ = b;
}
}
}