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__
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 * JasPer License Version 2.0
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 * Copyright (c) 2001-2006 Michael David Adams
 * Copyright (c) 1999-2000 Image Power, Inc.
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/*
 * Multicomponent Transform Code
 *
 * $Id: jpc_mct.c,v 1.2 2008-05-26 09:40:52 vp153 Exp $
 */

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>

#include "jasper/jas_seq.h"

#include "jpc_fix.h"
#include "jpc_mct.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;
            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);
            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;
        }
    }
}

jpc_fix_t jpc_mct_getsynweight(int mctid, int cmptno)
{
    jpc_fix_t synweight;

    synweight = JPC_FIX_ONE;
    switch (mctid) {
    case JPC_MCT_RCT:
        switch (cmptno) {
        case 0:
            synweight = jpc_dbltofix(sqrt(3.0));
            break;
        case 1:
            synweight = jpc_dbltofix(sqrt(0.6875));
            break;
        case 2:
            synweight = jpc_dbltofix(sqrt(0.6875));
            break;
        }
        break;
    case JPC_MCT_ICT:
        switch (cmptno) {
        case 0:
            synweight = jpc_dbltofix(sqrt(3.0000));
            break;
        case 1:
            synweight = jpc_dbltofix(sqrt(3.2584));
            break;
        case 2:
            synweight = jpc_dbltofix(sqrt(2.4755));
            break;
        }
        break;
#if 0
    default:
        synweight = JPC_FIX_ONE;
        break;
#endif
    }

    return synweight;
}