src/util/rmtxop.c

#ifndef lint
static const char RCSid[] = "$Id: rmtxop.c,v 2.27 2023/12/02 00:42:21 greg Exp $";
#endif
/*
 * General component matrix operations.
 */

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

#define MAXCOMP         MAXCSAMP        /* #components we support */

/* 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 */
static 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);
}

static int      checksymbolic(ROPMAT *rop);

/* Check/set transform based on a reference input file */
static 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) & (refm.dtype != DTspec)) {
                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];
        }
        return(0);
}

/* Compute conversion row from spectrum to one channel of RGB */
static 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 */
static 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 */
static void
sensrow(ROPMAT *rop, int r, double (*sf)(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 */
static int
checksymbolic(ROPMAT *rop)
{
        const int       nc = rop->mtx->ncomp;
        const int       dt = rop->mtx->dtype;
        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':
                        ++comp;
                        /* fall through */
                case 'G':
                        ++comp;
                        /* fall through */
                case 'R':
                        if (dt == DTxyze) {
                                for (i = 3; i--; )
                                        rop->preop.cmat[j*nc+i] = 1./WHTEFFICACY *
                                                        xyz2rgbmat[comp][i];
                        } else if (nc == 3)
                                rop->preop.cmat[j*nc+comp] = 1.;
                        else
                                rgbrow(rop, j, comp);
                        break;
                case 'Z':
                        ++comp;
                        /* fall through */
                case 'Y':
                        ++comp;
                        /* fall through */
                case 'X':
                        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*(dt != DTxyze); i--; )
                                rop->preop.cmat[j*nc+i] *= WHTEFFICACY;
                        break;
                case 'S':               /* scotopic (il)luminance */
                        sensrow(rop, j, scolor2scotopic);
                        for (i = nc; i--; )
                                rop->preop.cmat[j*nc+i] *= WHTSCOTOPIC;
                        break;
                case 'M':               /* melanopic (il)luminance */
                        sensrow(rop, j, scolor2melanopic);
                        for (i = nc; i--; )
                                rop->preop.cmat[j*nc+i] *= WHTMELANOPIC;
                        break;
                case 'A':               /* average component */
                        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 (!strcmp(rop->preop.csym, "XYZ")) {
                if (dt <= DTspec)
                        return(DTxyze);
        } else if (!strcmp(rop->preop.csym, "RGB")) {
                if (dt <= DTspec)
                        return(DTrgbe);
        }
        if ((nc > 3) & (dt <= DTspec))
                return(DTfloat);        /* probably not actual spectrum */
        return(0);
}

/* Get matrix and perform unary operations */
static 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? */
                mres = rmx_transpose(rop->mtx);
                if (mres == NULL) {
                        fputs(rop->inspec, stderr);
                        fputs(": transpose failed\n", stderr);
                        goto failure;
                }
                if (verbose) {
                        fputs(rop->inspec, stderr);
                        fputs(": transposed rows and columns\n", stderr);
                }
                rmx_free(rop->mtx);
                rop->mtx = mres;
        }
        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 */
static 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 */
static 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 */
static 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? */
static 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));
}

static 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);
}

static 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)     /* check data type */
                outfmt = mres->dtype;
        if (outfmt == DTrgbe) {
                if (mres->ncomp > 3)
                        outfmt = DTspec;
                else if (mres->dtype == DTxyze)
                        outfmt = DTxyze;
        }
        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:	2.28
Committed:	Sun Dec 3 02:28:33 2023 UTC (4 months, 3 weeks ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.27:	+8 -7 lines
Log Message:	fix(rmtxop): Corrected scalar post-multiplying component transform
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.28	static const char RCSid[] = "$Id: rmtxop.c,v 2.27 2023/12/02 00:42:21 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 "resolu.h"
11			#include "rmatrix.h"
12	greg	2.10	#include "platform.h"
13	greg	2.1
14	greg	2.22	#define MAXCOMP MAXCSAMP /* #components we support */
15	greg	2.1
16	greg	2.22	/* Unary matrix operation(s) */
17	greg	2.1	typedef struct {
18	greg	2.27	double cmat[MAXCOMPMAXCOMP]; / component transformation */
19	greg	2.1	double sca[MAXCOMP]; /* scalar coefficients */
20	greg	2.27	const char csym; / symbolic coefs or file */
21			short clen; /* number of coefficients */
22	greg	2.13	short nsf; /* number of scalars */
23	greg	2.27	short transpose; /* do transpose? */
24	greg	2.13	} RUNARYOP;
25
26	greg	2.22	/* Matrix input source and requested operation(s) */
27	greg	2.13	typedef struct {
28			const char inspec; / input specification */
29	greg	2.18	RMPref rmp; /* matrix preference */
30	greg	2.13	RUNARYOP preop; /* unary operation(s) */
31			RMATRIX mtx; / original matrix if loaded */
32			int binop; /* binary op with next (or 0) */
33			} ROPMAT;
34	greg	2.1
35			int verbose = 0; /* verbose reporting? */
36
37	greg	2.13	/* Load matrix */
38			static int
39			loadmatrix(ROPMAT *rop)
40	greg	2.1	{
41	greg	2.20	if (rop->mtx != NULL) /* already loaded? */
42	greg	2.13	return(0);
43
44	greg	2.18	rop->mtx = rmx_load(rop->inspec, rop->rmp);
45	greg	2.23
46			return(!rop->mtx ? -1 : 1);
47	greg	2.1	}
48
49	greg	2.27	static int checksymbolic(ROPMAT *rop);
50
51			/* Check/set transform based on a reference input file */
52			static int
53			checkreffile(ROPMAT *rop)
54			{
55			static const char *curRF = NULL;
56			static RMATRIX refm;
57			const int nc = rop->mtx->ncomp;
58			int i;
59
60			if (!curRF \|\| strcmp(rop->preop.csym, curRF)) {
61			FILE *fp = fopen(rop->preop.csym, "rb");
62			if (!rmx_load_header(&refm, fp)) {
63			fprintf(stderr, "%s: cannot read info header\n",
64			rop->preop.csym);
65			curRF = NULL;
66			if (fp) fclose(fp);
67			return(-1);
68			}
69			fclose(fp);
70			curRF = rop->preop.csym;
71			}
72			if ((refm.ncomp == 3) & (refm.dtype != DTspec)) {
73			rop->preop.csym = (refm.dtype == DTxyze) ? "XYZ" : "RGB";
74			return(checksymbolic(rop));
75			}
76			if (refm.ncomp == 2) {
77			fprintf(stderr, "%s: cannot convert to 2 components\n",
78			curRF);
79			return(-1);
80			}
81			if (refm.ncomp == 1) {
82			rop->preop.csym = "Y"; /* XXX big assumption */
83			return(checksymbolic(rop));
84			}
85			if (refm.ncomp == nc &&
86			!memcmp(refm.wlpart, rop->mtx->wlpart, sizeof(refm.wlpart)))
87			return(0); /* nothing to do */
88
89			if ((nc <= 3) \| (nc > MAXCSAMP) \| (refm.ncomp > MAXCSAMP)) {
90			fprintf(stderr, "%s: cannot resample from %d to %d components\n",
91			curRF, nc, refm.ncomp);
92			return(-1);
93			}
94			rop->preop.clen = refm.ncomp * nc; /* compute spec to ref */
95
96			for (i = 0; i < nc; i++) {
97			SCOLOR scstim, scresp;
98			int j;
99			memset(scstim, 0, sizeof(COLORV)*nc);
100			scstim[i] = 1.f;
101			convertscolor(scresp, refm.ncomp, refm.wlpart[0], refm.wlpart[3],
102			scstim, nc, rop->mtx->wlpart[0], rop->mtx->wlpart[3]);
103			for (j = refm.ncomp; j-- > 0; )
104			rop->preop.cmat[j*nc + i] = scresp[j];
105			}
106			return(0);
107			}
108
109	greg	2.22	/* Compute conversion row from spectrum to one channel of RGB */
110			static void
111			rgbrow(ROPMAT *rop, int r, int p)
112			{
113			const int nc = rop->mtx->ncomp;
114			const float * wlp = rop->mtx->wlpart;
115			int i;
116
117			for (i = nc; i--; ) {
118			int nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
119			int nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
120			COLOR crgb;
121			spec_rgb(crgb, nmStart, nmEnd);
122			rop->preop.cmat[r*nc+i] = crgb[p];
123			}
124			}
125
126			/* Compute conversion row from spectrum to one channel of XYZ */
127			static void
128			xyzrow(ROPMAT *rop, int r, int p)
129			{
130			const int nc = rop->mtx->ncomp;
131			const float * wlp = rop->mtx->wlpart;
132			int i;
133
134			for (i = nc; i--; ) {
135			int nmEnd = wlp[0] + (wlp[3] - wlp[0])*i/nc;
136			int nmStart = wlp[0] + (wlp[3] - wlp[0])*(i+1)/nc;
137			COLOR cxyz;
138			spec_cie(cxyz, nmStart, nmEnd);
139			rop->preop.cmat[r*nc+i] = cxyz[p];
140			}
141			}
142
143			/* Use the spectral sensitivity function to compute matrix coefficients */
144			static void
145			sensrow(ROPMAT rop, int r, double (sf)(SCOLOR sc, int ncs, const float wlpt[4]))
146			{
147			const int nc = rop->mtx->ncomp;
148			int i;
149
150			for (i = nc; i--; ) {
151			SCOLOR sclr;
152	greg	2.27	memset(sclr, 0, sizeof(COLORV)*nc);
153	greg	2.24	sclr[i] = 1.f;
154	greg	2.22	rop->preop.cmat[rnc+i] = (sf)(sclr, nc, rop->mtx->wlpart);
155			}
156			}
157
158			/* Check/set symbolic transform */
159			static int
160			checksymbolic(ROPMAT *rop)
161			{
162			const int nc = rop->mtx->ncomp;
163			const int dt = rop->mtx->dtype;
164			int i, j;
165	greg	2.27	/* check suffix => reference file */
166			if (strchr(rop->preop.csym, '.') > rop->preop.csym)
167			return(checkreffile(rop));
168	greg	2.22
169			if (nc < 3) {
170			fprintf(stderr, "%s: -c '%s' requires at least 3 components\n",
171			rop->inspec, rop->preop.csym);
172			return(-1);
173			}
174			rop->preop.clen = strlen(rop->preop.csym) * nc;
175			if (rop->preop.clen > MAXCOMP*MAXCOMP) {
176			fprintf(stderr, "%s: -c '%s' results in too many components\n",
177			rop->inspec, rop->preop.csym);
178			return(-1);
179			}
180			for (j = 0; rop->preop.csym[j]; j++) {
181			int comp = 0;
182			switch (rop->preop.csym[j]) {
183			case 'B':
184			++comp;
185			/* fall through */
186			case 'G':
187			++comp;
188			/* fall through */
189			case 'R':
190			if (dt == DTxyze) {
191			for (i = 3; i--; )
192			rop->preop.cmat[jnc+i] = 1./WHTEFFICACY
193			xyz2rgbmat[comp][i];
194			} else if (nc == 3)
195			rop->preop.cmat[j*nc+comp] = 1.;
196			else
197			rgbrow(rop, j, comp);
198			break;
199			case 'Z':
200			++comp;
201			/* fall through */
202			case 'Y':
203			++comp;
204			/* fall through */
205			case 'X':
206			if (dt == DTxyze) {
207			rop->preop.cmat[j*nc+comp] = 1.;
208			} else if (nc == 3) {
209			for (i = 3; i--; )
210			rop->preop.cmat[j*nc+i] =
211			rgb2xyzmat[comp][i];
212			} else if (comp == CIEY)
213			sensrow(rop, j, scolor2photopic);
214			else
215			xyzrow(rop, j, comp);
216
217			for (i = nc*(dt != DTxyze); i--; )
218			rop->preop.cmat[jnc+i] = WHTEFFICACY;
219			break;
220	greg	2.24	case 'S': /* scotopic (il)luminance */
221	greg	2.22	sensrow(rop, j, scolor2scotopic);
222			for (i = nc; i--; )
223			rop->preop.cmat[jnc+i] = WHTSCOTOPIC;
224			break;
225	greg	2.24	case 'M': /* melanopic (il)luminance */
226	greg	2.22	sensrow(rop, j, scolor2melanopic);
227			for (i = nc; i--; )
228			rop->preop.cmat[jnc+i] = WHTMELANOPIC;
229			break;
230	greg	2.24	case 'A': /* average component */
231			for (i = nc; i--; )
232	greg	2.25	rop->preop.cmat[j*nc+i] = 1./(double)nc;
233	greg	2.24	break;
234	greg	2.22	default:
235			fprintf(stderr, "%s: -c '%c' unsupported\n",
236			rop->inspec, rop->preop.csym[j]);
237			return(-1);
238			}
239			}
240			/* return recommended output type */
241			if (!strcmp(rop->preop.csym, "XYZ")) {
242			if (dt <= DTspec)
243			return(DTxyze);
244			} else if (!strcmp(rop->preop.csym, "RGB")) {
245			if (dt <= DTspec)
246			return(DTrgbe);
247			}
248			if ((nc > 3) & (dt <= DTspec))
249			return(DTfloat); /* probably not actual spectrum */
250			return(0);
251			}
252
253	greg	2.13	/* Get matrix and perform unary operations */
254	greg	2.1	static RMATRIX *
255	greg	2.13	loadop(ROPMAT *rop)
256	greg	2.1	{
257	greg	2.22	int outtype = 0;
258	greg	2.13	RMATRIX *mres;
259	greg	2.22	int i, j;
260	greg	2.1
261	greg	2.13	if (loadmatrix(rop) < 0) /* make sure we're loaded */
262	greg	2.1	return(NULL);
263	greg	2.13
264	greg	2.27	if (rop->preop.csym && /* symbolic transform? */
265	greg	2.22	(outtype = checksymbolic(rop)) < 0)
266			goto failure;
267			if (rop->preop.clen > 0) { /* apply component transform? */
268			if (rop->preop.clen % rop->mtx->ncomp) {
269			fprintf(stderr, "%s: -c must have N x %d coefficients\n",
270			rop->inspec, rop->mtx->ncomp);
271			goto failure;
272			}
273			if (rop->preop.nsf > 0) { /* scale transform, first */
274			if (rop->preop.nsf == 1) {
275			for (i = rop->preop.clen; i--; )
276			rop->preop.cmat[i] *= rop->preop.sca[0];
277	greg	2.28	} else if (rop->preop.nsf*rop->mtx->ncomp != rop->preop.clen) {
278	greg	2.22	fprintf(stderr, "%s: -s must have one or %d factors\n",
279	greg	2.28	rop->inspec,
280			rop->preop.clen/rop->mtx->ncomp);
281	greg	2.22	goto failure;
282			} else {
283	greg	2.28	for (i = rop->preop.nsf; i--; )
284			for (j = rop->mtx->ncomp; j--; )
285			rop->preop.cmat[i*rop->mtx->ncomp+j]
286			*= rop->preop.sca[i];
287	greg	2.22	}
288			}
289			mres = rmx_transform(rop->mtx, rop->preop.clen/rop->mtx->ncomp,
290			rop->preop.cmat);
291			if (mres == NULL) {
292			fprintf(stderr, "%s: matrix transform failed\n",
293			rop->inspec);
294	greg	2.13	goto failure;
295	greg	2.1	}
296	greg	2.22	if (verbose)
297			fprintf(stderr, "%s: applied %d x %d transform%s\n",
298			rop->inspec, mres->ncomp,
299			rop->mtx->ncomp,
300			rop->preop.nsf ? " (* scalar)" : "");
301	greg	2.26	rop->preop.nsf = 0; /* now folded in */
302	greg	2.22	if ((mres->ncomp > 3) & (mres->dtype <= DTspec))
303			outtype = DTfloat; /* probably not actual spectrum */
304			rmx_free(rop->mtx);
305			rop->mtx = mres;
306			}
307			if (rop->preop.nsf > 0) { /* apply scalar(s)? */
308	greg	2.13	if (rop->preop.nsf == 1) {
309			for (i = rop->mtx->ncomp; --i; )
310			rop->preop.sca[i] = rop->preop.sca[0];
311			} else if (rop->preop.nsf != rop->mtx->ncomp) {
312	greg	2.1	fprintf(stderr, "%s: -s must have one or %d factors\n",
313	greg	2.13	rop->inspec, rop->mtx->ncomp);
314			goto failure;
315	greg	2.1	}
316	greg	2.13	if (!rmx_scale(rop->mtx, rop->preop.sca)) {
317			fputs(rop->inspec, stderr);
318	greg	2.1	fputs(": scalar operation failed\n", stderr);
319	greg	2.13	goto failure;
320	greg	2.1	}
321			if (verbose) {
322	greg	2.13	fputs(rop->inspec, stderr);
323	greg	2.1	fputs(": applied scalar (", stderr);
324	greg	2.13	for (i = 0; i < rop->preop.nsf; i++)
325			fprintf(stderr, " %f", rop->preop.sca[i]);
326	greg	2.1	fputs(" )\n", stderr);
327			}
328			}
329	greg	2.22	if (rop->preop.transpose) { /* transpose matrix? */
330	greg	2.13	mres = rmx_transpose(rop->mtx);
331			if (mres == NULL) {
332			fputs(rop->inspec, stderr);
333	greg	2.12	fputs(": transpose failed\n", stderr);
334	greg	2.13	goto failure;
335	greg	2.12	}
336			if (verbose) {
337	greg	2.13	fputs(rop->inspec, stderr);
338	greg	2.12	fputs(": transposed rows and columns\n", stderr);
339			}
340	greg	2.13	rmx_free(rop->mtx);
341			rop->mtx = mres;
342			}
343			mres = rop->mtx;
344			rop->mtx = NULL;
345	greg	2.22	if (outtype)
346			mres->dtype = outtype;
347	greg	2.13	return(mres);
348			failure:
349			rmx_free(rop->mtx);
350			return(rop->mtx = NULL);
351			}
352
353			/* Execute binary operation, free matrix arguments and return new result */
354			static RMATRIX *
355			binaryop(const char inspec, RMATRIX mleft, int op, RMATRIX *mright)
356			{
357			RMATRIX *mres = NULL;
358			int i;
359
360			if ((mleft == NULL) \| (mright == NULL))
361			return(NULL);
362			switch (op) {
363			case '.': /* concatenate */
364	greg	2.16	if (mleft->ncomp != mright->ncomp) {
365			fputs(inspec, stderr);
366			fputs(": # components do not match\n", stderr);
367			} else if (mleft->ncols != mright->nrows) {
368			fputs(inspec, stderr);
369			fputs(": mismatched dimensions\n",
370			stderr);
371			} else
372			mres = rmx_multiply(mleft, mright);
373	greg	2.13	rmx_free(mleft);
374	greg	2.12	rmx_free(mright);
375	greg	2.1	if (mres == NULL) {
376	greg	2.13	fputs(inspec, stderr);
377	greg	2.16	fputs(": concatenation failed\n", stderr);
378	greg	2.1	return(NULL);
379			}
380			if (verbose) {
381	greg	2.13	fputs(inspec, stderr);
382	greg	2.1	fputs(": concatenated matrix\n", stderr);
383			}
384	greg	2.13	break;
385			case '+':
386			if (!rmx_sum(mleft, mright, NULL)) {
387			fputs(inspec, stderr);
388	greg	2.1	fputs(": matrix sum failed\n", stderr);
389	greg	2.13	rmx_free(mleft);
390	greg	2.1	rmx_free(mright);
391			return(NULL);
392			}
393			if (verbose) {
394	greg	2.13	fputs(inspec, stderr);
395	greg	2.1	fputs(": added in matrix\n", stderr);
396			}
397			rmx_free(mright);
398	greg	2.13	mres = mleft;
399			break;
400			case '*':
401			case '/': {
402			const char * tnam = (op == '/') ?
403	greg	2.11	"division" : "multiplication";
404			errno = 0;
405	greg	2.13	if (!rmx_elemult(mleft, mright, (op == '/'))) {
406	greg	2.11	fprintf(stderr, "%s: element-wise %s failed\n",
407	greg	2.13	inspec, tnam);
408			rmx_free(mleft);
409	greg	2.11	rmx_free(mright);
410			return(NULL);
411			}
412			if (errno)
413			fprintf(stderr,
414			"%s: warning - error during element-wise %s\n",
415	greg	2.13	inspec, tnam);
416	greg	2.11	else if (verbose)
417	greg	2.13	fprintf(stderr, "%s: element-wise %s\n", inspec, tnam);
418	greg	2.11	rmx_free(mright);
419	greg	2.13	mres = mleft;
420			} break;
421			default:
422			fprintf(stderr, "%s: unknown operation '%c'\n", inspec, op);
423			rmx_free(mleft);
424	greg	2.1	rmx_free(mright);
425			return(NULL);
426			}
427	greg	2.13	return(mres);
428			}
429
430			/* Perform matrix operations from left to right */
431			static RMATRIX *
432			op_left2right(ROPMAT *mop)
433			{
434			RMATRIX *mleft = loadop(mop);
435
436			while (mop->binop) {
437			if (mleft == NULL)
438			break;
439			mleft = binaryop(mop[1].inspec,
440			mleft, mop->binop, loadop(mop+1));
441			mop++;
442			}
443	greg	2.1	return(mleft);
444			}
445
446	greg	2.13	/* Perform matrix operations from right to left */
447			static RMATRIX *
448			op_right2left(ROPMAT *mop)
449			{
450			RMATRIX *mright;
451			int rpos = 0;
452			/* find end of list */
453			while (mop[rpos].binop)
454	greg	2.14	if (mop[rpos++].binop != '.') {
455			fputs(
456			"Right-to-left evaluation only for matrix multiplication!\n",
457			stderr);
458			return(NULL);
459			}
460	greg	2.13	mright = loadop(mop+rpos);
461			while (rpos-- > 0) {
462			if (mright == NULL)
463			break;
464	greg	2.20	mright = binaryop(mop[rpos+1].inspec,
465	greg	2.13	loadop(mop+rpos), mop[rpos].binop, mright);
466			}
467			return(mright);
468			}
469
470			#define t_nrows(mop) ((mop)->preop.transpose ? (mop)->mtx->ncols \
471			: (mop)->mtx->nrows)
472			#define t_ncols(mop) ((mop)->preop.transpose ? (mop)->mtx->nrows \
473			: (mop)->mtx->ncols)
474
475			/* Should we prefer concatenating from rightmost matrix towards left? */
476			static int
477			prefer_right2left(ROPMAT *mop)
478			{
479			int mri = 0;
480
481			while (mop[mri].binop) /* find rightmost matrix */
482			if (mop[mri++].binop != '.')
483			return(0); /* pre-empt reversal for other ops */
484
485			if (mri <= 1)
486			return(0); /* won't matter */
487
488			if (loadmatrix(mop+mri) < 0) /* load rightmost cat */
489			return(1); /* fail will bail in a moment */
490
491			if (t_ncols(mop+mri) == 1)
492			return(1); /* definitely better R->L */
493
494			if (t_ncols(mop+mri) >= t_nrows(mop+mri))
495			return(0); /* ...probably worse */
496
497			if (loadmatrix(mop) < 0) /* load leftmost */
498			return(0); /* fail will bail in a moment */
499
500			return(t_ncols(mop+mri) < t_nrows(mop));
501			}
502
503	greg	2.1	static int
504			get_factors(double da[], int n, char *av[])
505			{
506			int ac;
507
508			for (ac = 0; ac < n && isflt(av[ac]); ac++)
509			da[ac] = atof(av[ac]);
510			return(ac);
511			}
512
513	greg	2.13	static ROPMAT *
514	greg	2.26	resize_moparr(ROPMAT *mop, int n2alloc)
515	greg	2.13	{
516			int nmats = 0;
517	greg	2.26	int i;
518	greg	2.13
519			while (mop[nmats++].binop)
520			;
521	greg	2.26	for (i = nmats; i > n2alloc; i--)
522			rmx_free(mop[i].mtx);
523	greg	2.13	mop = (ROPMAT )realloc(mop, n2allocsizeof(ROPMAT));
524			if (mop == NULL) {
525	greg	2.26	fputs("Out of memory in resize_moparr()\n", stderr);
526	greg	2.13	exit(1);
527			}
528			if (n2alloc > nmats)
529			memset(mop+nmats, 0, (n2alloc-nmats)*sizeof(ROPMAT));
530			return(mop);
531			}
532
533	greg	2.1	/* Load one or more matrices and operate on them, sending results to stdout */
534			int
535			main(int argc, char *argv[])
536			{
537	greg	2.27	int outfmt = DTfromHeader;
538			const char *defCsym = NULL;
539			int nall = 2;
540			ROPMAT mop = (ROPMAT )calloc(nall, sizeof(ROPMAT));
541			int nmats = 0;
542			RMATRIX *mres = NULL;
543			int stdin_used = 0;
544			int i;
545	greg	2.1	/* get options and arguments */
546	greg	2.13	for (i = 1; i < argc; i++) {
547	greg	2.11	if (argv[i][0] && !argv[i][1] &&
548	greg	2.13	strchr(".+*/", argv[i][0]) != NULL) {
549	greg	2.15	if (!nmats \|\| mop[nmats-1].binop) {
550	greg	2.14	fprintf(stderr,
551	greg	2.15	"%s: missing matrix argument before '%c' operation\n",
552	greg	2.14	argv[0], argv[i][0]);
553	greg	2.13	return(1);
554			}
555	greg	2.15	mop[nmats-1].binop = argv[i][0];
556	greg	2.1	} else if (argv[i][0] != '-' \|\| !argv[i][1]) {
557	greg	2.13	if (argv[i][0] == '-') {
558			if (stdin_used++) {
559			fprintf(stderr,
560			"%s: standard input used for more than one matrix\n",
561			argv[0]);
562			return(1);
563			}
564			mop[nmats].inspec = stdin_name;
565			} else
566			mop[nmats].inspec = argv[i];
567	greg	2.27	if (!mop[nmats].preop.csym)
568			mop[nmats].preop.csym = defCsym;
569	greg	2.13	if (nmats > 0 && !mop[nmats-1].binop)
570			mop[nmats-1].binop = '.';
571			nmats++;
572	greg	2.1	} else {
573			int n = argc-1 - i;
574			switch (argv[i][1]) { /* get option */
575			case 'v':
576	greg	2.14	verbose++;
577	greg	2.1	break;
578			case 'f':
579			switch (argv[i][2]) {
580			case 'd':
581			outfmt = DTdouble;
582			break;
583			case 'f':
584			outfmt = DTfloat;
585			break;
586			case 'a':
587			outfmt = DTascii;
588			break;
589			case 'c':
590			outfmt = DTrgbe;
591			break;
592			default:
593			goto userr;
594			}
595			break;
596			case 't':
597	greg	2.13	mop[nmats].preop.transpose = 1;
598	greg	2.1	break;
599			case 's':
600			if (n > MAXCOMP) n = MAXCOMP;
601	greg	2.13	i += mop[nmats].preop.nsf =
602			get_factors(mop[nmats].preop.sca,
603			n, argv+i+1);
604	greg	2.22	if (mop[nmats].preop.nsf <= 0) {
605			fprintf(stderr, "%s: -s missing arguments\n",
606			argv[0]);
607			goto userr;
608			}
609	greg	2.1	break;
610	greg	2.27	case 'C':
611			if (!n \|\| isflt(argv[i+1]))
612			goto userr;
613			defCsym = mop[nmats].preop.csym = argv[++i];
614			mop[nmats].preop.clen = 0;
615			break;
616	greg	2.1	case 'c':
617	greg	2.27	if (n && !isflt(argv[i+1])) {
618			mop[nmats].preop.csym = argv[++i];
619	greg	2.22	mop[nmats].preop.clen = 0;
620			break;
621			}
622	greg	2.1	if (n > MAXCOMPMAXCOMP) n = MAXCOMPMAXCOMP;
623	greg	2.13	i += mop[nmats].preop.clen =
624			get_factors(mop[nmats].preop.cmat,
625			n, argv+i+1);
626	greg	2.22	if (mop[nmats].preop.clen <= 0) {
627			fprintf(stderr, "%s: -c missing arguments\n",
628			argv[0]);
629			goto userr;
630			}
631	greg	2.27	mop[nmats].preop.csym = NULL;
632	greg	2.1	break;
633	greg	2.18	case 'r':
634			if (argv[i][2] == 'f')
635			mop[nmats].rmp = RMPreflF;
636			else if (argv[i][2] == 'b')
637			mop[nmats].rmp = RMPreflB;
638			else
639			goto userr;
640			break;
641	greg	2.1	default:
642			fprintf(stderr, "%s: unknown operation '%s'\n",
643			argv[0], argv[i]);
644			goto userr;
645			}
646			}
647	greg	2.14	if (nmats >= nall)
648	greg	2.26	mop = resize_moparr(mop, nall += 2);
649	greg	2.13	}
650			if (mop[0].inspec == NULL) /* nothing to do? */
651	greg	2.1	goto userr;
652	greg	2.15	if (mop[nmats-1].binop) {
653			fprintf(stderr,
654			"%s: missing matrix argument after '%c' operation\n",
655			argv[0], mop[nmats-1].binop);
656			return(1);
657			}
658	greg	2.13	/* favor quicker concatenation */
659	greg	2.14	mop[nmats].mtx = prefer_right2left(mop) ? op_right2left(mop)
660			: op_left2right(mop);
661			if (mop[nmats].mtx == NULL)
662			return(1);
663			/* apply trailing unary operations */
664			mop[nmats].inspec = "trailing_ops";
665			mres = loadop(mop+nmats);
666			if (mres == NULL)
667	greg	2.13	return(1);
668	greg	2.22	if (outfmt == DTfromHeader) /* check data type */
669	greg	2.6	outfmt = mres->dtype;
670	greg	2.22	if (outfmt == DTrgbe) {
671			if (mres->ncomp > 3)
672			outfmt = DTspec;
673			else if (mres->dtype == DTxyze)
674			outfmt = DTxyze;
675			}
676	greg	2.26	newheader("RADIANCE", stdout); /* write result to stdout */
677	greg	2.1	printargs(argc, argv, stdout);
678	greg	2.23	return(rmx_write(mres, outfmt, stdout) ? 0 : 1);
679	greg	2.1	userr:
680			fprintf(stderr,
681	greg	2.26	"Usage: %s [-v][-f{adfc}][-t][-s sf .. \| -c ce ..][-rf\|-rb] m1 [.+*/] .. > mres\n",
682	greg	2.1	argv[0]);
683			return(1);
684			}