src/util/rmtxop.c

#ifndef lint
static const char RCSid[] = "$Id: rmtxop.c,v 2.39 2025/04/04 18:18:06 greg Exp $";
#endif
/*
 * General component matrix operations.
 */

#include <errno.h>
#include "rtio.h"
#include "rmatrix.h"
#include "platform.h"

/* Unary matrix operation(s) */
typedef struct {
        double          cmat[MAXCOMP*MAXCOMP];  /* component transformation */
        double          sca[MAXCOMP];           /* scalar coefficients */
        const char      *csym;                  /* symbolic coefs or file */
        short           clen;                   /* number of coefficients */
        short           nsf;                    /* number of scalars */
        short           transpose;              /* do transpose? */
} RUNARYOP;

/* Matrix input source and requested operation(s) */
typedef struct {
        const char      *inspec;                /* input specification */
        RMPref          rmp;                    /* matrix preference */
        RUNARYOP        preop;                  /* unary operation(s) */
        RMATRIX         *mtx;                   /* original matrix if loaded */
        int             binop;                  /* binary op with next (or 0) */
} ROPMAT;

int     verbose = 0;                    /* verbose reporting? */

/* Load matrix */
int
loadmatrix(ROPMAT *rop)
{
        if (rop->mtx != NULL)           /* already loaded? */
                return(0);

        rop->mtx = rmx_load(rop->inspec, rop->rmp);

        return(!rop->mtx ? -1 : 1);
}

extern int      checksymbolic(ROPMAT *rop);

/* Check/set transform based on a reference input file */
int
checkreffile(ROPMAT *rop)
{
        static const char       *curRF = NULL;
        static RMATRIX          refm;
        const int               nc = rop->mtx->ncomp;
        int                     i;

        if (!curRF || strcmp(rop->preop.csym, curRF)) {
                FILE    *fp = fopen(rop->preop.csym, "rb");
                if (!rmx_load_header(&refm, fp)) {
                        fprintf(stderr, "%s: cannot read info header\n",
                                        rop->preop.csym);
                        curRF = NULL;
                        if (fp) fclose(fp);
                        return(-1);
                }
                fclose(fp);
                curRF = rop->preop.csym;
        }
        if (refm.ncomp == 3) {
                rop->preop.csym = (refm.dtype == DTxyze) ? "XYZ" : "RGB";
                return(checksymbolic(rop));
        }
        if (refm.ncomp == 2) {
                fprintf(stderr, "%s: cannot convert to 2 components\n",
                                curRF);
                return(-1);
        }
        if (refm.ncomp == 1) {
                rop->preop.csym = "Y";          /* XXX big assumption */
                return(checksymbolic(rop));
        }
        if (refm.ncomp == nc &&
                        !memcmp(refm.wlpart, rop->mtx->wlpart, sizeof(refm.wlpart)))
                return(0);                      /* nothing to do */

        if ((nc <= 3) | (nc > MAXCSAMP) | (refm.ncomp > MAXCSAMP)) {
                fprintf(stderr, "%s: cannot resample from %d to %d components\n",
                                curRF, nc, refm.ncomp);
                return(-1);
        }
        rop->preop.clen = refm.ncomp * nc;      /* compute spec to ref */

        for (i = 0; i < nc; i++) {
                SCOLOR  scstim, scresp;
                int     j;
                memset(scstim, 0, sizeof(COLORV)*nc);
                scstim[i] = 1.f;
                convertscolor(scresp, refm.ncomp, refm.wlpart[0], refm.wlpart[3],
                                scstim, nc, rop->mtx->wlpart[0], rop->mtx->wlpart[3]);
                for (j = refm.ncomp; j-- > 0; )
                        rop->preop.cmat[j*nc + i] = scresp[j];
        }
        memcpy(rop->mtx->wlpart, refm.wlpart, sizeof(rop->mtx->wlpart));
        return(0);
}

/* Compute conversion row from spectrum to one channel of RGB */
void
rgbrow(ROPMAT *rop, int r, int p)
{
        const int       nc = rop->mtx->ncomp;
        const float *   wlp = rop->mtx->wlpart;
        int             i;

        for (i = nc; i--; ) {
                int     nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
                int     nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
                COLOR   crgb;
                spec_rgb(crgb, nmStart, nmEnd);
                rop->preop.cmat[r*nc+i] = crgb[p];
        }
}

/* Compute conversion row from spectrum to one channel of XYZ */
void
xyzrow(ROPMAT *rop, int r, int p)
{
        const int       nc = rop->mtx->ncomp;
        const float *   wlp = rop->mtx->wlpart;
        int             i;

        for (i = nc; i--; ) {
                int     nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
                int     nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
                COLOR   cxyz;
                spec_cie(cxyz, nmStart, nmEnd);
                rop->preop.cmat[r*nc+i] = cxyz[p];
        }
}

/* Use the spectral sensitivity function to compute matrix coefficients */
void
sensrow(ROPMAT *rop, int r, double (*sf)(const SCOLOR sc, int ncs, const float wlpt[4]))
{
        const int       nc = rop->mtx->ncomp;
        int             i;

        for (i = nc; i--; ) {
                SCOLOR  sclr;
                memset(sclr, 0, sizeof(COLORV)*nc);
                sclr[i] = 1.f;
                rop->preop.cmat[r*nc+i] = (*sf)(sclr, nc, rop->mtx->wlpart);
        }
}

/* Check/set symbolic transform */
int
checksymbolic(ROPMAT *rop)
{
        const int       nc = rop->mtx->ncomp;
        const int       dt = rop->mtx->dtype;
        double          cf = 1;
        int             i, j;
                                        /* check suffix => reference file */
        if (strchr(rop->preop.csym, '.') > rop->preop.csym)
                return(checkreffile(rop));

        if (nc < 3) {
                fprintf(stderr, "%s: -c '%s' requires at least 3 components\n",
                                rop->inspec, rop->preop.csym);
                return(-1);
        }
        rop->preop.clen = strlen(rop->preop.csym) * nc;
        if (rop->preop.clen > MAXCOMP*MAXCOMP) {
                fprintf(stderr, "%s: -c '%s' results in too many components\n",
                                rop->inspec, rop->preop.csym);
                return(-1);
        }
        for (j = 0; rop->preop.csym[j]; j++) {
                int     comp = 0;
                switch (rop->preop.csym[j]) {
                case 'B':
                case 'b':
                        ++comp;
                        /* fall through */
                case 'G':
                case 'g':
                        ++comp;
                        /* fall through */
                case 'R':
                case 'r':
                        if (rop->preop.csym[j] <= 'Z')
                                cf = 1./WHTEFFICACY;
                        if (dt == DTxyze) {
                                for (i = 3; i--; )
                                        rop->preop.cmat[j*nc+i] = cf*xyz2rgbmat[comp][i];
                        } else if (nc == 3)
                                rop->preop.cmat[j*nc+comp] = 1.;
                        else
                                rgbrow(rop, j, comp);
                        break;
                case 'Z':
                case 'z':
                        ++comp;
                        /* fall through */
                case 'Y':
                case 'y':
                        ++comp;
                        /* fall through */
                case 'X':
                case 'x':
                        if ((rop->preop.csym[j] <= 'Z') & (dt != DTxyze))
                                cf = WHTEFFICACY;
                        if (dt == DTxyze) {
                                rop->preop.cmat[j*nc+comp] = 1.;
                        } else if (nc == 3) {
                                for (i = 3; i--; )
                                        rop->preop.cmat[j*nc+i] =
                                                        rgb2xyzmat[comp][i];
                        } else if (comp == CIEY)
                                sensrow(rop, j, scolor2photopic);
                        else
                                xyzrow(rop, j, comp);

                        for (i = nc*(cf != 1); i--; )
                                rop->preop.cmat[j*nc+i] *= cf;
                        break;
                case 'S':               /* scotopic (il)luminance */
                        cf = WHTSCOTOPIC;
                        /* fall through */
                case 's':
                        sensrow(rop, j, scolor2scotopic);
                        for (i = nc*(cf != 1); i--; )
                                rop->preop.cmat[j*nc+i] *= cf;
                        break;
                case 'M':               /* melanopic (il)luminance */
                        cf = WHTMELANOPIC;
                        /* fall through */
                case 'm':
                        sensrow(rop, j, scolor2melanopic);
                        for (i = nc*(cf != 1); i--; )
                                rop->preop.cmat[j*nc+i] *= cf;
                        break;
                case 'A':               /* average component */
                case 'a':
                        for (i = nc; i--; )
                                rop->preop.cmat[j*nc+i] = 1./(double)nc;
                        break;
                default:
                        fprintf(stderr, "%s: -c '%c' unsupported\n",
                                rop->inspec, rop->preop.csym[j]);
                        return(-1);
                }
        }
                                        /* return recommended output type */
        if (!strcasecmp(rop->preop.csym, "XYZ")) {
                if (dt <= DTspec)
                        return(DTxyze);
        } else if (!strcasecmp(rop->preop.csym, "RGB")) {
                if (dt <= DTspec)
                        return(DTrgbe);
        } else if (dt == DTspec)
                return(DTfloat);        /* probably not actual spectrum */
        return(0);
}

/* Get matrix and perform unary operations */
RMATRIX *
loadop(ROPMAT *rop)
{
        int     outtype = 0;
        RMATRIX *mres;
        int     i, j;

        if (loadmatrix(rop) < 0)                /* make sure we're loaded */
                return(NULL);

        if (rop->preop.csym &&                  /* symbolic transform? */
                        (outtype = checksymbolic(rop)) < 0)
                goto failure;
        if (rop->preop.clen > 0) {              /* apply component transform? */
                if (rop->preop.clen % rop->mtx->ncomp) {
                        fprintf(stderr, "%s: -c must have N x %d coefficients\n",
                                        rop->inspec, rop->mtx->ncomp);
                        goto failure;
                }
                if (rop->preop.nsf > 0) {       /* scale transform, first */
                        if (rop->preop.nsf == 1) {
                                for (i = rop->preop.clen; i--; )
                                        rop->preop.cmat[i] *= rop->preop.sca[0];
                        } else if (rop->preop.nsf*rop->mtx->ncomp != rop->preop.clen) {
                                fprintf(stderr, "%s: -s must have one or %d factors\n",
                                                rop->inspec,
                                                rop->preop.clen/rop->mtx->ncomp);
                                goto failure;
                        } else {
                                for (i = rop->preop.nsf; i--; )
                                        for (j = rop->mtx->ncomp; j--; )
                                                rop->preop.cmat[i*rop->mtx->ncomp+j]
                                                                *= rop->preop.sca[i];
                        }
                }
                mres = rmx_transform(rop->mtx, rop->preop.clen/rop->mtx->ncomp,
                                        rop->preop.cmat);
                if (mres == NULL) {
                        fprintf(stderr, "%s: matrix transform failed\n",
                                                rop->inspec);
                        goto failure;
                }
                if (verbose)
                        fprintf(stderr, "%s: applied %d x %d transform%s\n",
                                        rop->inspec, mres->ncomp,
                                        rop->mtx->ncomp,
                                        rop->preop.nsf ? " (* scalar)" : "");
                rop->preop.nsf = 0;             /* now folded in */
                if ((mres->ncomp > 3) & (mres->dtype <= DTspec))
                        outtype = DTfloat;      /* probably not actual spectrum */
                rmx_free(rop->mtx);
                rop->mtx = mres;
        }
        if (rop->preop.nsf > 0) {               /* apply scalar(s)? */
                if (rop->preop.nsf == 1) {
                        for (i = rop->mtx->ncomp; --i; )
                                rop->preop.sca[i] = rop->preop.sca[0];
                } else if (rop->preop.nsf != rop->mtx->ncomp) {
                        fprintf(stderr, "%s: -s must have one or %d factors\n",
                                        rop->inspec, rop->mtx->ncomp);
                        goto failure;
                }
                if (!rmx_scale(rop->mtx, rop->preop.sca)) {
                        fputs(rop->inspec, stderr);
                        fputs(": scalar operation failed\n", stderr);
                        goto failure;
                }
                if (verbose) {
                        fputs(rop->inspec, stderr);
                        fputs(": applied scalar (", stderr);
                        for (i = 0; i < rop->preop.nsf; i++)
                                fprintf(stderr, " %f", rop->preop.sca[i]);
                        fputs(" )\n", stderr);
                }
        }
        if (rop->preop.transpose) {             /* transpose matrix? */
                if (!rmx_transpose(rop->mtx)) {
                        fputs(rop->inspec, stderr);
                        fputs(": transpose failed\n", stderr);
                        goto failure;
                }
                if (verbose) {
                        fputs(rop->inspec, stderr);
                        fputs(": transposed rows and columns\n", stderr);
                }
        }
        mres = rop->mtx;
        rop->mtx = NULL;
        if (outtype)
                mres->dtype = outtype;
        return(mres);
failure:
        rmx_free(rop->mtx);
        return(rop->mtx = NULL);
}

/* Execute binary operation, free matrix arguments and return new result */
RMATRIX *
binaryop(const char *inspec, RMATRIX *mleft, int op, RMATRIX *mright)
{
        RMATRIX *mres = NULL;
        int     i;

        if ((mleft == NULL) | (mright == NULL))
                return(NULL);
        switch (op) {
        case '.':                       /* concatenate */
                if (mleft->ncomp != mright->ncomp) {
                        fputs(inspec, stderr);
                        fputs(": # components do not match\n", stderr);
                } else if (mleft->ncols != mright->nrows) {
                        fputs(inspec, stderr);
                        fputs(": mismatched dimensions\n",
                                        stderr);
                } else
                        mres = rmx_multiply(mleft, mright);
                rmx_free(mleft);
                rmx_free(mright);
                if (mres == NULL) {
                        fputs(inspec, stderr);
                        fputs(": concatenation failed\n", stderr);
                        return(NULL);
                }
                if (verbose) {
                        fputs(inspec, stderr);
                        fputs(": concatenated matrix\n", stderr);
                }
                break;
        case '+':
                if (!rmx_sum(mleft, mright, NULL)) {
                        fputs(inspec, stderr);
                        fputs(": matrix sum failed\n", stderr);
                        rmx_free(mleft);
                        rmx_free(mright);
                        return(NULL);
                }
                if (verbose) {
                        fputs(inspec, stderr);
                        fputs(": added in matrix\n", stderr);
                }
                rmx_free(mright);
                mres = mleft;
                break;
        case '*':
        case '/': {
                const char *    tnam = (op == '/') ?
                                        "division" : "multiplication";
                errno = 0;
                if (!rmx_elemult(mleft, mright, (op == '/'))) {
                        fprintf(stderr, "%s: element-wise %s failed\n",
                                        inspec, tnam);
                        rmx_free(mleft);
                        rmx_free(mright);
                        return(NULL);
                }
                if (errno)
                        fprintf(stderr,
                                "%s: warning - error during element-wise %s\n",
                                        inspec, tnam);
                else if (verbose)
                        fprintf(stderr, "%s: element-wise %s\n", inspec, tnam);
                rmx_free(mright);
                mres = mleft;
                } break;
        default:
                fprintf(stderr, "%s: unknown operation '%c'\n", inspec, op);
                rmx_free(mleft);
                rmx_free(mright);
                return(NULL);
        }
        return(mres);
}

/* Perform matrix operations from left to right */
RMATRIX *
op_left2right(ROPMAT *mop)
{
        RMATRIX *mleft = loadop(mop);

        while (mop->binop) {
                if (mleft == NULL)
                        break;
                mleft = binaryop(mop[1].inspec,
                                mleft, mop->binop, loadop(mop+1));
                mop++;
        }
        return(mleft);
}

/* Perform matrix operations from right to left */
RMATRIX *
op_right2left(ROPMAT *mop)
{
        RMATRIX *mright;
        int     rpos = 0;
                                        /* find end of list */
        while (mop[rpos].binop)
                if (mop[rpos++].binop != '.') {
                        fputs(
                "Right-to-left evaluation only for matrix multiplication!\n",
                                        stderr);
                        return(NULL);
                }
        mright = loadop(mop+rpos);
        while (rpos-- > 0) {
                if (mright == NULL)
                        break;
                mright = binaryop(mop[rpos+1].inspec,
                                loadop(mop+rpos), mop[rpos].binop, mright);
        }
        return(mright);
}

#define t_nrows(mop)    ((mop)->preop.transpose ? (mop)->mtx->ncols \
                                                : (mop)->mtx->nrows)
#define t_ncols(mop)    ((mop)->preop.transpose ? (mop)->mtx->nrows \
                                                : (mop)->mtx->ncols)

/* Should we prefer concatenating from rightmost matrix towards left? */
int
prefer_right2left(ROPMAT *mop)
{
        int     mri = 0;

        while (mop[mri].binop)          /* find rightmost matrix */
                if (mop[mri++].binop != '.')
                        return(0);      /* pre-empt reversal for other ops */

        if (mri <= 1)
                return(0);              /* won't matter */

        if (loadmatrix(mop+mri) < 0)    /* load rightmost cat */
                return(1);              /* fail will bail in a moment */

        if (t_ncols(mop+mri) == 1)
                return(1);              /* definitely better R->L */

        if (t_ncols(mop+mri) >= t_nrows(mop+mri))
                return(0);              /* ...probably worse */

        if (loadmatrix(mop) < 0)        /* load leftmost */
                return(0);              /* fail will bail in a moment */

        return(t_ncols(mop+mri) < t_nrows(mop));
}

int
get_factors(double da[], int n, char *av[])
{
        int     ac;

        for (ac = 0; ac < n && isflt(av[ac]); ac++)
                da[ac] = atof(av[ac]);
        return(ac);
}

ROPMAT *
resize_moparr(ROPMAT *mop, int n2alloc)
{
        int     nmats = 0;
        int     i;

        while (mop[nmats++].binop)
                ;
        for (i = nmats; i >= n2alloc; i--)
                rmx_free(mop[i].mtx);
        mop = (ROPMAT *)realloc(mop, n2alloc*sizeof(ROPMAT));
        if (mop == NULL) {
                fputs("Out of memory in resize_moparr()\n", stderr);
                exit(1);
        }
        if (n2alloc > nmats)
                memset(mop+nmats, 0, (n2alloc-nmats)*sizeof(ROPMAT));
        return(mop);
}

/* Load one or more matrices and operate on them, sending results to stdout */
int
main(int argc, char *argv[])
{
        int             outfmt = DTfromHeader;
        const char      *defCsym = NULL;
        int             nall = 2;
        ROPMAT          *mop = (ROPMAT *)calloc(nall, sizeof(ROPMAT));
        int             nmats = 0;
        RMATRIX         *mres = NULL;
        int             stdin_used = 0;
        int             i;
                                        /* get options and arguments */
        for (i = 1; i < argc; i++) {
                if (argv[i][0] && !argv[i][1] &&
                                strchr(".+*/", argv[i][0]) != NULL) {
                        if (!nmats || mop[nmats-1].binop) {
                                fprintf(stderr,
                        "%s: missing matrix argument before '%c' operation\n",
                                                argv[0], argv[i][0]);
                                return(1);
                        }
                        mop[nmats-1].binop = argv[i][0];
                } else if (argv[i][0] != '-' || !argv[i][1]) {
                        if (argv[i][0] == '-') {
                                if (stdin_used++) {
                                        fprintf(stderr,
                        "%s: standard input used for more than one matrix\n",
                                                argv[0]);
                                        return(1);
                                }
                                mop[nmats].inspec = stdin_name;
                        } else
                                mop[nmats].inspec = argv[i];
                        if (!mop[nmats].preop.csym)
                                mop[nmats].preop.csym = defCsym;
                        if (nmats > 0 && !mop[nmats-1].binop)
                                mop[nmats-1].binop = '.';
                        nmats++;
                } else {
                        int     n = argc-1 - i;
                        switch (argv[i][1]) {   /* get option */
                        case 'v':
                                verbose++;
                                break;
                        case 'f':
                                switch (argv[i][2]) {
                                case 'd':
                                        outfmt = DTdouble;
                                        break;
                                case 'f':
                                        outfmt = DTfloat;
                                        break;
                                case 'a':
                                        outfmt = DTascii;
                                        break;
                                case 'c':
                                        outfmt = DTrgbe;
                                        break;
                                default:
                                        goto userr;
                                }
                                break;
                        case 't':
                                mop[nmats].preop.transpose = 1;
                                break;
                        case 's':
                                if (n > MAXCOMP) n = MAXCOMP;
                                i += mop[nmats].preop.nsf =
                                        get_factors(mop[nmats].preop.sca,
                                                        n, argv+i+1);
                                if (mop[nmats].preop.nsf <= 0) {
                                        fprintf(stderr, "%s: -s missing arguments\n",
                                                        argv[0]);
                                        goto userr;
                                }
                                break;
                        case 'C':
                                if (!n || isflt(argv[i+1]))
                                        goto userr;
                                defCsym = mop[nmats].preop.csym = argv[++i];
                                mop[nmats].preop.clen = 0;
                                break;
                        case 'c':
                                if (n && !isflt(argv[i+1])) {
                                        mop[nmats].preop.csym = argv[++i];
                                        mop[nmats].preop.clen = 0;
                                        break;
                                }
                                if (n > MAXCOMP*MAXCOMP) n = MAXCOMP*MAXCOMP;
                                i += mop[nmats].preop.clen =
                                        get_factors(mop[nmats].preop.cmat,
                                                        n, argv+i+1);
                                if (mop[nmats].preop.clen <= 0) {
                                        fprintf(stderr, "%s: -c missing arguments\n",
                                                        argv[0]);
                                        goto userr;
                                }
                                mop[nmats].preop.csym = NULL;
                                break;
                        case 'r':
                                if (argv[i][2] == 'f')
                                        mop[nmats].rmp = RMPreflF;
                                else if (argv[i][2] == 'b')
                                        mop[nmats].rmp = RMPreflB;
                                else
                                        goto userr;
                                break;
                        default:
                                fprintf(stderr, "%s: unknown operation '%s'\n",
                                                argv[0], argv[i]);
                                goto userr;
                        }
                }
                if (nmats >= nall)
                        mop = resize_moparr(mop, nall += 2);
        }
        if (mop[0].inspec == NULL)      /* nothing to do? */
                goto userr;
        if (mop[nmats-1].binop) {
                fprintf(stderr,
                        "%s: missing matrix argument after '%c' operation\n",
                                argv[0], mop[nmats-1].binop);
                return(1);
        }
                                        /* favor quicker concatenation */
        mop[nmats].mtx = prefer_right2left(mop) ? op_right2left(mop)
                                                : op_left2right(mop);
        if (mop[nmats].mtx == NULL)
                return(1);
                                        /* apply trailing unary operations */
        mop[nmats].inspec = "trailing_ops";
        mres = loadop(mop+nmats);
        if (mres == NULL)
                return(1);
        if ((outfmt == DTfromHeader) & (mres->dtype < DTspec))
                outfmt = mres->dtype;
        if (outfmt == DTrgbe) {         /* check data type */
                if (mres->ncomp > 3)
                        outfmt = DTspec;
                else if (mres->dtype == DTxyze)
                        outfmt = DTxyze;
        }
#if DTrmx_native==DTfloat
        if (outfmt == DTdouble)
                fprintf(stderr,
                        "%s: warning - writing float result as double\n",
                                argv[0]);
#endif
        newheader("RADIANCE", stdout);  /* write result to stdout */
        printargs(argc, argv, stdout);
        return(rmx_write(mres, outfmt, stdout) ? 0 : 1);
userr:
        fprintf(stderr,
        "Usage: %s [-v][-f{adfc}][-t][-s sf .. | -c ce ..][-rf|-rb] m1 [.+*/] .. > mres\n",
                        argv[0]);
        return(1);
}
Revision:	2.40
Committed:	Fri Apr 4 22:47:56 2025 UTC (4 weeks ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.39:	+3 -3 lines
Log Message:	fix(rmtxop,rcomb): Minor fixes to auto-typing, preferring native output
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.40	static const char RCSid[] = "$Id: rmtxop.c,v 2.39 2025/04/04 18:18:06 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* General component matrix operations.
6			*/
7
8	greg	2.11	#include <errno.h>
9	greg	2.1	#include "rtio.h"
10			#include "rmatrix.h"
11	greg	2.10	#include "platform.h"
12	greg	2.1
13	greg	2.22	/* Unary matrix operation(s) */
14	greg	2.1	typedef struct {
15	greg	2.27	double cmat[MAXCOMPMAXCOMP]; / component transformation */
16	greg	2.1	double sca[MAXCOMP]; /* scalar coefficients */
17	greg	2.27	const char csym; / symbolic coefs or file */
18			short clen; /* number of coefficients */
19	greg	2.13	short nsf; /* number of scalars */
20	greg	2.27	short transpose; /* do transpose? */
21	greg	2.13	} RUNARYOP;
22
23	greg	2.22	/* Matrix input source and requested operation(s) */
24	greg	2.13	typedef struct {
25			const char inspec; / input specification */
26	greg	2.18	RMPref rmp; /* matrix preference */
27	greg	2.13	RUNARYOP preop; /* unary operation(s) */
28			RMATRIX mtx; / original matrix if loaded */
29			int binop; /* binary op with next (or 0) */
30			} ROPMAT;
31	greg	2.1
32			int verbose = 0; /* verbose reporting? */
33
34	greg	2.13	/* Load matrix */
35	greg	2.35	int
36	greg	2.13	loadmatrix(ROPMAT *rop)
37	greg	2.1	{
38	greg	2.20	if (rop->mtx != NULL) /* already loaded? */
39	greg	2.13	return(0);
40
41	greg	2.18	rop->mtx = rmx_load(rop->inspec, rop->rmp);
42	greg	2.23
43			return(!rop->mtx ? -1 : 1);
44	greg	2.1	}
45
46	greg	2.35	extern int checksymbolic(ROPMAT *rop);
47	greg	2.27
48			/* Check/set transform based on a reference input file */
49	greg	2.35	int
50	greg	2.27	checkreffile(ROPMAT *rop)
51			{
52			static const char *curRF = NULL;
53			static RMATRIX refm;
54			const int nc = rop->mtx->ncomp;
55			int i;
56
57			if (!curRF \|\| strcmp(rop->preop.csym, curRF)) {
58			FILE *fp = fopen(rop->preop.csym, "rb");
59			if (!rmx_load_header(&refm, fp)) {
60			fprintf(stderr, "%s: cannot read info header\n",
61			rop->preop.csym);
62			curRF = NULL;
63			if (fp) fclose(fp);
64			return(-1);
65			}
66			fclose(fp);
67			curRF = rop->preop.csym;
68			}
69	greg	2.30	if (refm.ncomp == 3) {
70	greg	2.27	rop->preop.csym = (refm.dtype == DTxyze) ? "XYZ" : "RGB";
71			return(checksymbolic(rop));
72			}
73			if (refm.ncomp == 2) {
74			fprintf(stderr, "%s: cannot convert to 2 components\n",
75			curRF);
76			return(-1);
77			}
78			if (refm.ncomp == 1) {
79			rop->preop.csym = "Y"; /* XXX big assumption */
80			return(checksymbolic(rop));
81			}
82			if (refm.ncomp == nc &&
83			!memcmp(refm.wlpart, rop->mtx->wlpart, sizeof(refm.wlpart)))
84			return(0); /* nothing to do */
85
86			if ((nc <= 3) \| (nc > MAXCSAMP) \| (refm.ncomp > MAXCSAMP)) {
87			fprintf(stderr, "%s: cannot resample from %d to %d components\n",
88			curRF, nc, refm.ncomp);
89			return(-1);
90			}
91			rop->preop.clen = refm.ncomp * nc; /* compute spec to ref */
92
93			for (i = 0; i < nc; i++) {
94			SCOLOR scstim, scresp;
95			int j;
96			memset(scstim, 0, sizeof(COLORV)*nc);
97			scstim[i] = 1.f;
98			convertscolor(scresp, refm.ncomp, refm.wlpart[0], refm.wlpart[3],
99			scstim, nc, rop->mtx->wlpart[0], rop->mtx->wlpart[3]);
100			for (j = refm.ncomp; j-- > 0; )
101			rop->preop.cmat[j*nc + i] = scresp[j];
102			}
103	greg	2.29	memcpy(rop->mtx->wlpart, refm.wlpart, sizeof(rop->mtx->wlpart));
104	greg	2.27	return(0);
105			}
106
107	greg	2.22	/* Compute conversion row from spectrum to one channel of RGB */
108	greg	2.35	void
109	greg	2.22	rgbrow(ROPMAT *rop, int r, int p)
110			{
111			const int nc = rop->mtx->ncomp;
112			const float * wlp = rop->mtx->wlpart;
113			int i;
114
115			for (i = nc; i--; ) {
116			int nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
117			int nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
118			COLOR crgb;
119			spec_rgb(crgb, nmStart, nmEnd);
120			rop->preop.cmat[r*nc+i] = crgb[p];
121			}
122			}
123
124			/* Compute conversion row from spectrum to one channel of XYZ */
125	greg	2.35	void
126	greg	2.22	xyzrow(ROPMAT *rop, int r, int p)
127			{
128			const int nc = rop->mtx->ncomp;
129			const float * wlp = rop->mtx->wlpart;
130			int i;
131
132			for (i = nc; i--; ) {
133			int nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
134			int nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
135			COLOR cxyz;
136			spec_cie(cxyz, nmStart, nmEnd);
137			rop->preop.cmat[r*nc+i] = cxyz[p];
138			}
139			}
140
141			/* Use the spectral sensitivity function to compute matrix coefficients */
142	greg	2.35	void
143	greg	2.34	sensrow(ROPMAT rop, int r, double (sf)(const SCOLOR sc, int ncs, const float wlpt[4]))
144	greg	2.22	{
145			const int nc = rop->mtx->ncomp;
146			int i;
147
148			for (i = nc; i--; ) {
149			SCOLOR sclr;
150	greg	2.27	memset(sclr, 0, sizeof(COLORV)*nc);
151	greg	2.24	sclr[i] = 1.f;
152	greg	2.22	rop->preop.cmat[rnc+i] = (sf)(sclr, nc, rop->mtx->wlpart);
153			}
154			}
155
156			/* Check/set symbolic transform */
157	greg	2.35	int
158	greg	2.22	checksymbolic(ROPMAT *rop)
159			{
160			const int nc = rop->mtx->ncomp;
161			const int dt = rop->mtx->dtype;
162	greg	2.31	double cf = 1;
163	greg	2.22	int i, j;
164	greg	2.27	/* check suffix => reference file */
165			if (strchr(rop->preop.csym, '.') > rop->preop.csym)
166			return(checkreffile(rop));
167	greg	2.22
168			if (nc < 3) {
169			fprintf(stderr, "%s: -c '%s' requires at least 3 components\n",
170			rop->inspec, rop->preop.csym);
171			return(-1);
172			}
173			rop->preop.clen = strlen(rop->preop.csym) * nc;
174			if (rop->preop.clen > MAXCOMP*MAXCOMP) {
175			fprintf(stderr, "%s: -c '%s' results in too many components\n",
176			rop->inspec, rop->preop.csym);
177			return(-1);
178			}
179			for (j = 0; rop->preop.csym[j]; j++) {
180			int comp = 0;
181			switch (rop->preop.csym[j]) {
182			case 'B':
183	greg	2.31	case 'b':
184	greg	2.22	++comp;
185			/* fall through */
186			case 'G':
187	greg	2.31	case 'g':
188	greg	2.22	++comp;
189			/* fall through */
190			case 'R':
191	greg	2.31	case 'r':
192			if (rop->preop.csym[j] <= 'Z')
193			cf = 1./WHTEFFICACY;
194	greg	2.22	if (dt == DTxyze) {
195			for (i = 3; i--; )
196	greg	2.31	rop->preop.cmat[jnc+i] = cfxyz2rgbmat[comp][i];
197	greg	2.22	} else if (nc == 3)
198			rop->preop.cmat[j*nc+comp] = 1.;
199			else
200			rgbrow(rop, j, comp);
201			break;
202			case 'Z':
203	greg	2.31	case 'z':
204	greg	2.22	++comp;
205			/* fall through */
206			case 'Y':
207	greg	2.31	case 'y':
208	greg	2.22	++comp;
209			/* fall through */
210			case 'X':
211	greg	2.31	case 'x':
212			if ((rop->preop.csym[j] <= 'Z') & (dt != DTxyze))
213			cf = WHTEFFICACY;
214	greg	2.22	if (dt == DTxyze) {
215			rop->preop.cmat[j*nc+comp] = 1.;
216			} else if (nc == 3) {
217			for (i = 3; i--; )
218			rop->preop.cmat[j*nc+i] =
219			rgb2xyzmat[comp][i];
220			} else if (comp == CIEY)
221			sensrow(rop, j, scolor2photopic);
222			else
223			xyzrow(rop, j, comp);
224
225	greg	2.31	for (i = nc*(cf != 1); i--; )
226			rop->preop.cmat[jnc+i] = cf;
227	greg	2.22	break;
228	greg	2.24	case 'S': /* scotopic (il)luminance */
229	greg	2.31	cf = WHTSCOTOPIC;
230			/* fall through */
231			case 's':
232	greg	2.22	sensrow(rop, j, scolor2scotopic);
233	greg	2.31	for (i = nc*(cf != 1); i--; )
234			rop->preop.cmat[jnc+i] = cf;
235	greg	2.22	break;
236	greg	2.24	case 'M': /* melanopic (il)luminance */
237	greg	2.31	cf = WHTMELANOPIC;
238			/* fall through */
239			case 'm':
240	greg	2.22	sensrow(rop, j, scolor2melanopic);
241	greg	2.31	for (i = nc*(cf != 1); i--; )
242			rop->preop.cmat[jnc+i] = cf;
243	greg	2.22	break;
244	greg	2.24	case 'A': /* average component */
245	greg	2.31	case 'a':
246	greg	2.24	for (i = nc; i--; )
247	greg	2.25	rop->preop.cmat[j*nc+i] = 1./(double)nc;
248	greg	2.24	break;
249	greg	2.22	default:
250			fprintf(stderr, "%s: -c '%c' unsupported\n",
251			rop->inspec, rop->preop.csym[j]);
252			return(-1);
253			}
254			}
255			/* return recommended output type */
256	greg	2.32	if (!strcasecmp(rop->preop.csym, "XYZ")) {
257	greg	2.22	if (dt <= DTspec)
258			return(DTxyze);
259	greg	2.32	} else if (!strcasecmp(rop->preop.csym, "RGB")) {
260	greg	2.22	if (dt <= DTspec)
261			return(DTrgbe);
262	greg	2.30	} else if (dt == DTspec)
263	greg	2.22	return(DTfloat); /* probably not actual spectrum */
264			return(0);
265			}
266
267	greg	2.13	/* Get matrix and perform unary operations */
268	greg	2.35	RMATRIX *
269	greg	2.13	loadop(ROPMAT *rop)
270	greg	2.1	{
271	greg	2.22	int outtype = 0;
272	greg	2.13	RMATRIX *mres;
273	greg	2.22	int i, j;
274	greg	2.1
275	greg	2.13	if (loadmatrix(rop) < 0) /* make sure we're loaded */
276	greg	2.1	return(NULL);
277	greg	2.13
278	greg	2.27	if (rop->preop.csym && /* symbolic transform? */
279	greg	2.22	(outtype = checksymbolic(rop)) < 0)
280			goto failure;
281			if (rop->preop.clen > 0) { /* apply component transform? */
282			if (rop->preop.clen % rop->mtx->ncomp) {
283			fprintf(stderr, "%s: -c must have N x %d coefficients\n",
284			rop->inspec, rop->mtx->ncomp);
285			goto failure;
286			}
287			if (rop->preop.nsf > 0) { /* scale transform, first */
288			if (rop->preop.nsf == 1) {
289			for (i = rop->preop.clen; i--; )
290			rop->preop.cmat[i] *= rop->preop.sca[0];
291	greg	2.28	} else if (rop->preop.nsf*rop->mtx->ncomp != rop->preop.clen) {
292	greg	2.22	fprintf(stderr, "%s: -s must have one or %d factors\n",
293	greg	2.28	rop->inspec,
294			rop->preop.clen/rop->mtx->ncomp);
295	greg	2.22	goto failure;
296			} else {
297	greg	2.28	for (i = rop->preop.nsf; i--; )
298			for (j = rop->mtx->ncomp; j--; )
299			rop->preop.cmat[i*rop->mtx->ncomp+j]
300			*= rop->preop.sca[i];
301	greg	2.22	}
302			}
303			mres = rmx_transform(rop->mtx, rop->preop.clen/rop->mtx->ncomp,
304			rop->preop.cmat);
305			if (mres == NULL) {
306			fprintf(stderr, "%s: matrix transform failed\n",
307			rop->inspec);
308	greg	2.13	goto failure;
309	greg	2.1	}
310	greg	2.22	if (verbose)
311			fprintf(stderr, "%s: applied %d x %d transform%s\n",
312			rop->inspec, mres->ncomp,
313			rop->mtx->ncomp,
314			rop->preop.nsf ? " (* scalar)" : "");
315	greg	2.26	rop->preop.nsf = 0; /* now folded in */
316	greg	2.22	if ((mres->ncomp > 3) & (mres->dtype <= DTspec))
317			outtype = DTfloat; /* probably not actual spectrum */
318			rmx_free(rop->mtx);
319			rop->mtx = mres;
320			}
321			if (rop->preop.nsf > 0) { /* apply scalar(s)? */
322	greg	2.13	if (rop->preop.nsf == 1) {
323			for (i = rop->mtx->ncomp; --i; )
324			rop->preop.sca[i] = rop->preop.sca[0];
325			} else if (rop->preop.nsf != rop->mtx->ncomp) {
326	greg	2.1	fprintf(stderr, "%s: -s must have one or %d factors\n",
327	greg	2.13	rop->inspec, rop->mtx->ncomp);
328			goto failure;
329	greg	2.1	}
330	greg	2.13	if (!rmx_scale(rop->mtx, rop->preop.sca)) {
331			fputs(rop->inspec, stderr);
332	greg	2.1	fputs(": scalar operation failed\n", stderr);
333	greg	2.13	goto failure;
334	greg	2.1	}
335			if (verbose) {
336	greg	2.13	fputs(rop->inspec, stderr);
337	greg	2.1	fputs(": applied scalar (", stderr);
338	greg	2.13	for (i = 0; i < rop->preop.nsf; i++)
339			fprintf(stderr, " %f", rop->preop.sca[i]);
340	greg	2.1	fputs(" )\n", stderr);
341			}
342			}
343	greg	2.22	if (rop->preop.transpose) { /* transpose matrix? */
344	greg	2.37	if (!rmx_transpose(rop->mtx)) {
345	greg	2.13	fputs(rop->inspec, stderr);
346	greg	2.12	fputs(": transpose failed\n", stderr);
347	greg	2.13	goto failure;
348	greg	2.12	}
349			if (verbose) {
350	greg	2.13	fputs(rop->inspec, stderr);
351	greg	2.12	fputs(": transposed rows and columns\n", stderr);
352			}
353	greg	2.13	}
354			mres = rop->mtx;
355			rop->mtx = NULL;
356	greg	2.22	if (outtype)
357			mres->dtype = outtype;
358	greg	2.13	return(mres);
359			failure:
360			rmx_free(rop->mtx);
361			return(rop->mtx = NULL);
362			}
363
364			/* Execute binary operation, free matrix arguments and return new result */
365	greg	2.35	RMATRIX *
366	greg	2.13	binaryop(const char inspec, RMATRIX mleft, int op, RMATRIX *mright)
367			{
368			RMATRIX *mres = NULL;
369			int i;
370
371			if ((mleft == NULL) \| (mright == NULL))
372			return(NULL);
373			switch (op) {
374			case '.': /* concatenate */
375	greg	2.16	if (mleft->ncomp != mright->ncomp) {
376			fputs(inspec, stderr);
377			fputs(": # components do not match\n", stderr);
378			} else if (mleft->ncols != mright->nrows) {
379			fputs(inspec, stderr);
380			fputs(": mismatched dimensions\n",
381			stderr);
382			} else
383			mres = rmx_multiply(mleft, mright);
384	greg	2.13	rmx_free(mleft);
385	greg	2.12	rmx_free(mright);
386	greg	2.1	if (mres == NULL) {
387	greg	2.13	fputs(inspec, stderr);
388	greg	2.16	fputs(": concatenation failed\n", stderr);
389	greg	2.1	return(NULL);
390			}
391			if (verbose) {
392	greg	2.13	fputs(inspec, stderr);
393	greg	2.1	fputs(": concatenated matrix\n", stderr);
394			}
395	greg	2.13	break;
396			case '+':
397			if (!rmx_sum(mleft, mright, NULL)) {
398			fputs(inspec, stderr);
399	greg	2.1	fputs(": matrix sum failed\n", stderr);
400	greg	2.13	rmx_free(mleft);
401	greg	2.1	rmx_free(mright);
402			return(NULL);
403			}
404			if (verbose) {
405	greg	2.13	fputs(inspec, stderr);
406	greg	2.1	fputs(": added in matrix\n", stderr);
407			}
408			rmx_free(mright);
409	greg	2.13	mres = mleft;
410			break;
411			case '*':
412			case '/': {
413			const char * tnam = (op == '/') ?
414	greg	2.11	"division" : "multiplication";
415			errno = 0;
416	greg	2.13	if (!rmx_elemult(mleft, mright, (op == '/'))) {
417	greg	2.11	fprintf(stderr, "%s: element-wise %s failed\n",
418	greg	2.13	inspec, tnam);
419			rmx_free(mleft);
420	greg	2.11	rmx_free(mright);
421			return(NULL);
422			}
423			if (errno)
424			fprintf(stderr,
425			"%s: warning - error during element-wise %s\n",
426	greg	2.13	inspec, tnam);
427	greg	2.11	else if (verbose)
428	greg	2.13	fprintf(stderr, "%s: element-wise %s\n", inspec, tnam);
429	greg	2.11	rmx_free(mright);
430	greg	2.13	mres = mleft;
431			} break;
432			default:
433			fprintf(stderr, "%s: unknown operation '%c'\n", inspec, op);
434			rmx_free(mleft);
435	greg	2.1	rmx_free(mright);
436			return(NULL);
437			}
438	greg	2.13	return(mres);
439			}
440
441			/* Perform matrix operations from left to right */
442	greg	2.35	RMATRIX *
443	greg	2.13	op_left2right(ROPMAT *mop)
444			{
445			RMATRIX *mleft = loadop(mop);
446
447			while (mop->binop) {
448			if (mleft == NULL)
449			break;
450			mleft = binaryop(mop[1].inspec,
451			mleft, mop->binop, loadop(mop+1));
452			mop++;
453			}
454	greg	2.1	return(mleft);
455			}
456
457	greg	2.13	/* Perform matrix operations from right to left */
458	greg	2.35	RMATRIX *
459	greg	2.13	op_right2left(ROPMAT *mop)
460			{
461			RMATRIX *mright;
462			int rpos = 0;
463			/* find end of list */
464			while (mop[rpos].binop)
465	greg	2.14	if (mop[rpos++].binop != '.') {
466			fputs(
467			"Right-to-left evaluation only for matrix multiplication!\n",
468			stderr);
469			return(NULL);
470			}
471	greg	2.13	mright = loadop(mop+rpos);
472			while (rpos-- > 0) {
473			if (mright == NULL)
474			break;
475	greg	2.20	mright = binaryop(mop[rpos+1].inspec,
476	greg	2.13	loadop(mop+rpos), mop[rpos].binop, mright);
477			}
478			return(mright);
479			}
480
481			#define t_nrows(mop) ((mop)->preop.transpose ? (mop)->mtx->ncols \
482			: (mop)->mtx->nrows)
483			#define t_ncols(mop) ((mop)->preop.transpose ? (mop)->mtx->nrows \
484			: (mop)->mtx->ncols)
485
486			/* Should we prefer concatenating from rightmost matrix towards left? */
487	greg	2.35	int
488	greg	2.13	prefer_right2left(ROPMAT *mop)
489			{
490			int mri = 0;
491
492			while (mop[mri].binop) /* find rightmost matrix */
493			if (mop[mri++].binop != '.')
494			return(0); /* pre-empt reversal for other ops */
495
496			if (mri <= 1)
497			return(0); /* won't matter */
498
499			if (loadmatrix(mop+mri) < 0) /* load rightmost cat */
500			return(1); /* fail will bail in a moment */
501
502			if (t_ncols(mop+mri) == 1)
503			return(1); /* definitely better R->L */
504
505			if (t_ncols(mop+mri) >= t_nrows(mop+mri))
506			return(0); /* ...probably worse */
507
508			if (loadmatrix(mop) < 0) /* load leftmost */
509			return(0); /* fail will bail in a moment */
510
511			return(t_ncols(mop+mri) < t_nrows(mop));
512			}
513
514	greg	2.35	int
515	greg	2.1	get_factors(double da[], int n, char *av[])
516			{
517			int ac;
518
519			for (ac = 0; ac < n && isflt(av[ac]); ac++)
520			da[ac] = atof(av[ac]);
521			return(ac);
522			}
523
524	greg	2.35	ROPMAT *
525	greg	2.26	resize_moparr(ROPMAT *mop, int n2alloc)
526	greg	2.13	{
527			int nmats = 0;
528	greg	2.26	int i;
529	greg	2.13
530			while (mop[nmats++].binop)
531			;
532	greg	2.35	for (i = nmats; i >= n2alloc; i--)
533	greg	2.26	rmx_free(mop[i].mtx);
534	greg	2.13	mop = (ROPMAT )realloc(mop, n2allocsizeof(ROPMAT));
535			if (mop == NULL) {
536	greg	2.26	fputs("Out of memory in resize_moparr()\n", stderr);
537	greg	2.13	exit(1);
538			}
539			if (n2alloc > nmats)
540			memset(mop+nmats, 0, (n2alloc-nmats)*sizeof(ROPMAT));
541			return(mop);
542			}
543
544	greg	2.1	/* Load one or more matrices and operate on them, sending results to stdout */
545			int
546			main(int argc, char *argv[])
547			{
548	greg	2.27	int outfmt = DTfromHeader;
549			const char *defCsym = NULL;
550			int nall = 2;
551			ROPMAT mop = (ROPMAT )calloc(nall, sizeof(ROPMAT));
552			int nmats = 0;
553			RMATRIX *mres = NULL;
554			int stdin_used = 0;
555			int i;
556	greg	2.1	/* get options and arguments */
557	greg	2.13	for (i = 1; i < argc; i++) {
558	greg	2.11	if (argv[i][0] && !argv[i][1] &&
559	greg	2.13	strchr(".+*/", argv[i][0]) != NULL) {
560	greg	2.15	if (!nmats \|\| mop[nmats-1].binop) {
561	greg	2.14	fprintf(stderr,
562	greg	2.15	"%s: missing matrix argument before '%c' operation\n",
563	greg	2.14	argv[0], argv[i][0]);
564	greg	2.13	return(1);
565			}
566	greg	2.15	mop[nmats-1].binop = argv[i][0];
567	greg	2.1	} else if (argv[i][0] != '-' \|\| !argv[i][1]) {
568	greg	2.13	if (argv[i][0] == '-') {
569			if (stdin_used++) {
570			fprintf(stderr,
571			"%s: standard input used for more than one matrix\n",
572			argv[0]);
573			return(1);
574			}
575			mop[nmats].inspec = stdin_name;
576			} else
577			mop[nmats].inspec = argv[i];
578	greg	2.27	if (!mop[nmats].preop.csym)
579			mop[nmats].preop.csym = defCsym;
580	greg	2.13	if (nmats > 0 && !mop[nmats-1].binop)
581			mop[nmats-1].binop = '.';
582			nmats++;
583	greg	2.1	} else {
584			int n = argc-1 - i;
585			switch (argv[i][1]) { /* get option */
586			case 'v':
587	greg	2.14	verbose++;
588	greg	2.1	break;
589			case 'f':
590			switch (argv[i][2]) {
591			case 'd':
592			outfmt = DTdouble;
593			break;
594			case 'f':
595			outfmt = DTfloat;
596			break;
597			case 'a':
598			outfmt = DTascii;
599			break;
600			case 'c':
601			outfmt = DTrgbe;
602			break;
603			default:
604			goto userr;
605			}
606			break;
607			case 't':
608	greg	2.13	mop[nmats].preop.transpose = 1;
609	greg	2.1	break;
610			case 's':
611			if (n > MAXCOMP) n = MAXCOMP;
612	greg	2.13	i += mop[nmats].preop.nsf =
613			get_factors(mop[nmats].preop.sca,
614			n, argv+i+1);
615	greg	2.22	if (mop[nmats].preop.nsf <= 0) {
616			fprintf(stderr, "%s: -s missing arguments\n",
617			argv[0]);
618			goto userr;
619			}
620	greg	2.1	break;
621	greg	2.27	case 'C':
622			if (!n \|\| isflt(argv[i+1]))
623			goto userr;
624			defCsym = mop[nmats].preop.csym = argv[++i];
625			mop[nmats].preop.clen = 0;
626			break;
627	greg	2.1	case 'c':
628	greg	2.27	if (n && !isflt(argv[i+1])) {
629			mop[nmats].preop.csym = argv[++i];
630	greg	2.22	mop[nmats].preop.clen = 0;
631			break;
632			}
633	greg	2.1	if (n > MAXCOMPMAXCOMP) n = MAXCOMPMAXCOMP;
634	greg	2.13	i += mop[nmats].preop.clen =
635			get_factors(mop[nmats].preop.cmat,
636			n, argv+i+1);
637	greg	2.22	if (mop[nmats].preop.clen <= 0) {
638			fprintf(stderr, "%s: -c missing arguments\n",
639			argv[0]);
640			goto userr;
641			}
642	greg	2.27	mop[nmats].preop.csym = NULL;
643	greg	2.1	break;
644	greg	2.18	case 'r':
645			if (argv[i][2] == 'f')
646			mop[nmats].rmp = RMPreflF;
647			else if (argv[i][2] == 'b')
648			mop[nmats].rmp = RMPreflB;
649			else
650			goto userr;
651			break;
652	greg	2.1	default:
653			fprintf(stderr, "%s: unknown operation '%s'\n",
654			argv[0], argv[i]);
655			goto userr;
656			}
657			}
658	greg	2.14	if (nmats >= nall)
659	greg	2.26	mop = resize_moparr(mop, nall += 2);
660	greg	2.13	}
661			if (mop[0].inspec == NULL) /* nothing to do? */
662	greg	2.1	goto userr;
663	greg	2.15	if (mop[nmats-1].binop) {
664			fprintf(stderr,
665			"%s: missing matrix argument after '%c' operation\n",
666			argv[0], mop[nmats-1].binop);
667			return(1);
668			}
669	greg	2.13	/* favor quicker concatenation */
670	greg	2.14	mop[nmats].mtx = prefer_right2left(mop) ? op_right2left(mop)
671			: op_left2right(mop);
672			if (mop[nmats].mtx == NULL)
673			return(1);
674			/* apply trailing unary operations */
675			mop[nmats].inspec = "trailing_ops";
676			mres = loadop(mop+nmats);
677			if (mres == NULL)
678	greg	2.13	return(1);
679	greg	2.40	if ((outfmt == DTfromHeader) & (mres->dtype < DTspec))
680	greg	2.6	outfmt = mres->dtype;
681	greg	2.40	if (outfmt == DTrgbe) { /* check data type */
682	greg	2.22	if (mres->ncomp > 3)
683			outfmt = DTspec;
684			else if (mres->dtype == DTxyze)
685			outfmt = DTxyze;
686			}
687	greg	2.39	#if DTrmx_native==DTfloat
688			if (outfmt == DTdouble)
689			fprintf(stderr,
690			"%s: warning - writing float result as double\n",
691			argv[0]);
692			#endif
693	greg	2.26	newheader("RADIANCE", stdout); /* write result to stdout */
694	greg	2.1	printargs(argc, argv, stdout);
695	greg	2.23	return(rmx_write(mres, outfmt, stdout) ? 0 : 1);
696	greg	2.1	userr:
697			fprintf(stderr,
698	greg	2.26	"Usage: %s [-v][-f{adfc}][-t][-s sf .. \| -c ce ..][-rf\|-rb] m1 [.+*/] .. > mres\n",
699	greg	2.1	argv[0]);
700			return(1);
701			}