src/util/rmatrix.c

#ifndef lint
static const char RCSid[] = "$Id: rmatrix.c,v 2.39 2019/12/28 18:05:14 greg Exp $";
#endif
/*
 * General matrix operations.
 */

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

static char     rmx_mismatch_warn[] = "WARNING: data type mismatch\n";

/* Allocate a nr x nc matrix with n components */
RMATRIX *
rmx_alloc(int nr, int nc, int n)
{
        RMATRIX *dnew;

        if ((nr <= 0) | (nc <= 0) | (n <= 0))
                return(NULL);
        dnew = (RMATRIX *)malloc(sizeof(RMATRIX)-sizeof(dnew->mtx) +
                                        sizeof(dnew->mtx[0])*(n*nr*nc));
        if (!dnew)
                return(NULL);
        dnew->nrows = nr; dnew->ncols = nc; dnew->ncomp = n;
        dnew->dtype = DTdouble;
        dnew->swapin = 0;
        dnew->info = NULL;
        return(dnew);
}

/* Free a RMATRIX array */
void
rmx_free(RMATRIX *rm)
{
        if (!rm) return;
        if (rm->info)
                free(rm->info);
        free(rm);
}

/* Resolve data type based on two input types (returns 0 for mismatch) */
int
rmx_newtype(int dtyp1, int dtyp2)
{
        if ((dtyp1==DTxyze) | (dtyp1==DTrgbe) |
                        (dtyp2==DTxyze) | (dtyp2==DTrgbe)
                        && dtyp1 != dtyp2)
                return(0);
        if (dtyp1 < dtyp2)
                return(dtyp1);
        return(dtyp2);
}

/* Append header information associated with matrix data */
int
rmx_addinfo(RMATRIX *rm, const char *info)
{
        if (!rm || !info || !*info)
                return(0);
        if (!rm->info) {
                rm->info = (char *)malloc(strlen(info)+1);
                if (rm->info) rm->info[0] = '\0';
        } else
                rm->info = (char *)realloc(rm->info,
                                strlen(rm->info)+strlen(info)+1);
        if (!rm->info)
                return(0);
        strcat(rm->info, info);
        return(1);
}

static int
get_dminfo(char *s, void *p)
{
        RMATRIX *ip = (RMATRIX *)p;
        char    fmt[MAXFMTLEN];
        int     i;

        if (headidval(fmt, s))
                return(0);
        if (!strncmp(s, "NCOMP=", 6)) {
                ip->ncomp = atoi(s+6);
                return(0);
        }
        if (!strncmp(s, "NROWS=", 6)) {
                ip->nrows = atoi(s+6);
                return(0);
        }
        if (!strncmp(s, "NCOLS=", 6)) {
                ip->ncols = atoi(s+6);
                return(0);
        }
        if ((i = isbigendian(s)) >= 0) {
                ip->swapin = (nativebigendian() != i);
                return(0);
        }
        if (isexpos(s)) {
                double  d = exposval(s);
                scalecolor(ip->mtx, d);
                return(0);
        }
        if (iscolcor(s)) {
                COLOR   ctmp;
                colcorval(ctmp, s);
                multcolor(ip->mtx, ctmp);
                return(0);
        }
        if (!formatval(fmt, s)) {
                rmx_addinfo(ip, s);
                return(0);
        }
        for (i = 1; i < DTend; i++)
                if (!strcmp(fmt, cm_fmt_id[i])) {
                        ip->dtype = i;
                        return(0);
                }
        return(-1);
}

static int
rmx_load_ascii(RMATRIX *rm, FILE *fp)
{
        int     i, j, k;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++)
                for (k = 0; k < rm->ncomp; k++)
                    if (fscanf(fp, "%lf", &rmx_lval(rm,i,j,k)) != 1)
                        return(0);
        return(1);
}

static int
rmx_load_float(RMATRIX *rm, FILE *fp)
{
        int     i, j, k;
        float   val[100];

        if (rm->ncomp > 100) {
                fputs("Unsupported # components in rmx_load_float()\n", stderr);
                exit(1);
        }
        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                if (getbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
                    return(0);
                if (rm->swapin)
                    swap32((char *)val, rm->ncomp);
                for (k = rm->ncomp; k--; )
                     rmx_lval(rm,i,j,k) = val[k];
            }
        return(1);
}

static int
rmx_load_double(RMATRIX *rm, FILE *fp)
{
        int     i, j;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                if (getbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
                    return(0);
                if (rm->swapin)
                    swap64((char *)&rmx_lval(rm,i,j,0), rm->ncomp);
            }
        return(1);
}

static int
rmx_load_rgbe(RMATRIX *rm, FILE *fp)
{
        COLOR   *scan = (COLOR *)malloc(sizeof(COLOR)*rm->ncols);
        int     i, j;

        if (!scan)
                return(0);
        for (i = 0; i < rm->nrows; i++) {
            if (freadscan(scan, rm->ncols, fp) < 0) {
                free(scan);
                return(0);
            }
            for (j = rm->ncols; j--; ) {
                rmx_lval(rm,i,j,0) = colval(scan[j],RED);
                rmx_lval(rm,i,j,1) = colval(scan[j],GRN);
                rmx_lval(rm,i,j,2) = colval(scan[j],BLU);
            }
        }
        free(scan);
        return(1);
}

/* Load matrix from supported file type */
RMATRIX *
rmx_load(const char *inspec)
{
        FILE            *fp = stdin;
        RMATRIX         dinfo;
        RMATRIX         *dnew;

        if (!inspec) {                          /* reading from stdin? */
                inspec = "<stdin>";
                SET_FILE_BINARY(stdin);
        } else if (inspec[0] == '!') {
                if (!(fp = popen(inspec+1, "r")))
                        return(NULL);
                SET_FILE_BINARY(fp);
        } else {
                const char      *sp = inspec;   /* check suffix */
                while (*sp)
                        ++sp;
                while (sp > inspec && sp[-1] != '.')
                        --sp;
                if (!strcasecmp(sp, "XML")) {   /* assume it's a BSDF */
                        CMATRIX *cm = cm_loadBTDF((char *)inspec);
                        if (!cm)
                                return(NULL);
                        dnew = rmx_from_cmatrix(cm);
                        cm_free(cm);
                        dnew->dtype = DTascii;
                        return(dnew);
                }
                                                /* else open it ourselves */
                if (!(fp = fopen(inspec, "rb")))
                        return(NULL);
        }
#ifdef getc_unlocked
        flockfile(fp);
#endif
        dinfo.nrows = dinfo.ncols = dinfo.ncomp = 0;
        dinfo.dtype = DTascii;                  /* assumed w/o FORMAT */
        dinfo.swapin = 0;
        dinfo.info = NULL;
        dinfo.mtx[0] = dinfo.mtx[1] = dinfo.mtx[2] = 1.;
        if (getheader(fp, get_dminfo, &dinfo) < 0) {
                fclose(fp);
                return(NULL);
        }
        if ((dinfo.nrows <= 0) | (dinfo.ncols <= 0)) {
                if (!fscnresolu(&dinfo.ncols, &dinfo.nrows, fp)) {
                        fclose(fp);
                        return(NULL);
                }
                if (dinfo.ncomp <= 0)
                        dinfo.ncomp = 3;
                else if ((dinfo.dtype == DTrgbe) | (dinfo.dtype == DTxyze) &&
                                dinfo.ncomp != 3) {
                        fclose(fp);
                        return(NULL);
                }
        }
        dnew = rmx_alloc(dinfo.nrows, dinfo.ncols, dinfo.ncomp);
        if (!dnew) {
                fclose(fp);
                return(NULL);
        }
        dnew->info = dinfo.info;
        switch (dinfo.dtype) {
        case DTascii:
                SET_FILE_TEXT(fp);
                if (!rmx_load_ascii(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTascii;          /* should leave double? */
                break;
        case DTfloat:
                dnew->swapin = dinfo.swapin;
                if (!rmx_load_float(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTfloat;
                break;
        case DTdouble:
                dnew->swapin = dinfo.swapin;
                if (!rmx_load_double(dnew, fp))
                        goto loaderr;
                dnew->dtype = DTdouble;
                break;
        case DTrgbe:
        case DTxyze:
                if (!rmx_load_rgbe(dnew, fp))
                        goto loaderr;
                dnew->dtype = dinfo.dtype;      /* undo exposure? */
                if ((dinfo.mtx[0] != 1.) | (dinfo.mtx[1] != 1.) |
                                (dinfo.mtx[2] != 1.)) {
                        dinfo.mtx[0] = 1./dinfo.mtx[0];
                        dinfo.mtx[1] = 1./dinfo.mtx[1];
                        dinfo.mtx[2] = 1./dinfo.mtx[2];
                        rmx_scale(dnew, dinfo.mtx);
                }
                break;
        default:
                goto loaderr;
        }
        if (fp != stdin) {
                if (inspec[0] == '!')
                        pclose(fp);
                else
                        fclose(fp);
        }
#ifdef getc_unlocked
        else
                funlockfile(fp);
#endif
        return(dnew);
loaderr:                                        /* should report error? */
        if (inspec[0] == '!')
                pclose(fp);
        else
                fclose(fp);
        rmx_free(dnew);
        return(NULL);
}

static int
rmx_write_ascii(const RMATRIX *rm, FILE *fp)
{
        const char      *fmt = (rm->dtype == DTfloat) ? " %.7e" :
                        (rm->dtype == DTrgbe) | (rm->dtype == DTxyze) ? " %.3e" :
                                " %.15e" ;
        int     i, j, k;

        for (i = 0; i < rm->nrows; i++) {
            for (j = 0; j < rm->ncols; j++) {
                for (k = 0; k < rm->ncomp; k++)
                    fprintf(fp, fmt, rmx_lval(rm,i,j,k));
                fputc('\t', fp);
            }
            fputc('\n', fp);
        }
        return(1);
}

static int
rmx_write_float(const RMATRIX *rm, FILE *fp)
{
        int     i, j, k;
        float   val[100];

        if (rm->ncomp > 100) {
                fputs("Unsupported # components in rmx_write_float()\n", stderr);
                exit(1);
        }
        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++) {
                for (k = rm->ncomp; k--; )
                    val[k] = (float)rmx_lval(rm,i,j,k);
                if (putbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
                        return(0);
            }
        return(1);
}

static int
rmx_write_double(const RMATRIX *rm, FILE *fp)
{
        int     i, j;

        for (i = 0; i < rm->nrows; i++)
            for (j = 0; j < rm->ncols; j++)
                if (putbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
                        return(0);
        return(1);
}

static int
rmx_write_rgbe(const RMATRIX *rm, FILE *fp)
{
        COLR    *scan = (COLR *)malloc(sizeof(COLR)*rm->ncols);
        int     i, j;

        if (!scan)
                return(0);
        for (i = 0; i < rm->nrows; i++) {
            for (j = rm->ncols; j--; )
                setcolr(scan[j],        rmx_lval(rm,i,j,0),
                                        rmx_lval(rm,i,j,1),
                                        rmx_lval(rm,i,j,2)      );
            if (fwritecolrs(scan, rm->ncols, fp) < 0) {
                free(scan);
                return(0);
            }
        }
        free(scan);
        return(1);
}

/* Write matrix to file type indicated by dtype */
int
rmx_write(const RMATRIX *rm, int dtype, FILE *fp)
{
        RMATRIX *mydm = NULL;
        int     ok = 1;

        if (!rm | !fp)
                return(0);
#ifdef getc_unlocked
        flockfile(fp);
#endif
                                                /* complete header */
        if (rm->info)
                fputs(rm->info, fp);
        if (dtype == DTfromHeader)
                dtype = rm->dtype;
        else if ((dtype == DTrgbe) & (rm->dtype == DTxyze))
                dtype = DTxyze;
        else if ((dtype == DTxyze) & (rm->dtype == DTrgbe))
                dtype = DTrgbe;
        if ((dtype != DTrgbe) & (dtype != DTxyze)) {
                fprintf(fp, "NROWS=%d\n", rm->nrows);
                fprintf(fp, "NCOLS=%d\n", rm->ncols);
                fprintf(fp, "NCOMP=%d\n", rm->ncomp);
        } else if (rm->ncomp != 3) {            /* wrong # components? */
                double  cmtx[3];
                if (rm->ncomp != 1)             /* only convert grayscale */
                        return(0);
                cmtx[0] = cmtx[1] = cmtx[2] = 1;
                mydm = rmx_transform(rm, 3, cmtx);
                if (!mydm)
                        return(0);
                rm = mydm;
        }
        if ((dtype == DTfloat) | (dtype == DTdouble))
                fputendian(fp);                 /* important to record */
        fputformat((char *)cm_fmt_id[dtype], fp);
        fputc('\n', fp);
        switch (dtype) {                        /* write data */
        case DTascii:
                ok = rmx_write_ascii(rm, fp);
                break;
        case DTfloat:
                ok = rmx_write_float(rm, fp);
                break;
        case DTdouble:
                ok = rmx_write_double(rm, fp);
                break;
        case DTrgbe:
        case DTxyze:
                fprtresolu(rm->ncols, rm->nrows, fp);
                ok = rmx_write_rgbe(rm, fp);
                break;
        default:
                return(0);
        }
        ok &= (fflush(fp) == 0);
#ifdef getc_unlocked
        funlockfile(fp);
#endif
        if (mydm)
                rmx_free(mydm);
        return(ok);
}

/* Allocate and assign square identity matrix with n components */
RMATRIX *
rmx_identity(const int dim, const int n)
{
        RMATRIX *rid = rmx_alloc(dim, dim, n);
        int     i, k;

        if (!rid)
                return(NULL);
        memset(rid->mtx, 0, sizeof(rid->mtx[0])*n*dim*dim);
        for (i = dim; i--; )
            for (k = n; k--; )
                rmx_lval(rid,i,i,k) = 1;
        return(rid);
}

/* Duplicate the given matrix */
RMATRIX *
rmx_copy(const RMATRIX *rm)
{
        RMATRIX *dnew;

        if (!rm)
                return(NULL);
        dnew = rmx_alloc(rm->nrows, rm->ncols, rm->ncomp);
        if (!dnew)
                return(NULL);
        rmx_addinfo(dnew, rm->info);
        dnew->dtype = rm->dtype;
        memcpy(dnew->mtx, rm->mtx,
                sizeof(rm->mtx[0])*rm->ncomp*rm->nrows*rm->ncols);
        return(dnew);
}

/* Allocate and assign transposed matrix */
RMATRIX *
rmx_transpose(const RMATRIX *rm)
{
        RMATRIX *dnew;
        int     i, j, k;

        if (!rm)
                return(0);
        if ((rm->nrows == 1) | (rm->ncols == 1)) {
                dnew = rmx_copy(rm);
                if (!dnew)
                        return(NULL);
                dnew->nrows = rm->ncols;
                dnew->ncols = rm->nrows;
                return(dnew);
        }
        dnew = rmx_alloc(rm->ncols, rm->nrows, rm->ncomp);
        if (!dnew)
                return(NULL);
        if (rm->info) {
                rmx_addinfo(dnew, rm->info);
                rmx_addinfo(dnew, "Transposed rows and columns\n");
        }
        dnew->dtype = rm->dtype;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; )
                for (k = dnew->ncomp; k--; )
                        rmx_lval(dnew,i,j,k) = rmx_lval(rm,j,i,k);
        return(dnew);
}

/* Multiply (concatenate) two matrices and allocate the result */
RMATRIX *
rmx_multiply(const RMATRIX *m1, const RMATRIX *m2)
{
        RMATRIX *mres;
        int     i, j, k, h;

        if (!m1 | !m2 || (m1->ncomp != m2->ncomp) | (m1->ncols != m2->nrows))
                return(NULL);
        mres = rmx_alloc(m1->nrows, m2->ncols, m1->ncomp);
        if (!mres)
                return(NULL);
        i = rmx_newtype(m1->dtype, m2->dtype);
        if (i)
                mres->dtype = i;
        else
                rmx_addinfo(mres, rmx_mismatch_warn);
        for (i = mres->nrows; i--; )
            for (j = mres->ncols; j--; )
                for (k = mres->ncomp; k--; ) {
                    long double d = 0;
                    for (h = m1->ncols; h--; )
                        d += rmx_lval(m1,i,h,k) * rmx_lval(m2,h,j,k);
                    rmx_lval(mres,i,j,k) = (double)d;
                }
        return(mres);
}

/* Element-wise multiplication (or division) of m2 into m1 */
int
rmx_elemult(RMATRIX *m1, const RMATRIX *m2, int divide)
{
        int     zeroDivides = 0;
        int     i, j, k;

        if (!m1 | !m2 || (m1->ncols != m2->ncols) | (m1->nrows != m2->nrows))
                return(0);
        if ((m2->ncomp > 1) & (m2->ncomp != m1->ncomp))
                return(0);
        i = rmx_newtype(m1->dtype, m2->dtype);
        if (i)
                m1->dtype = i;
        else
                rmx_addinfo(m1, rmx_mismatch_warn);
        for (i = m1->nrows; i--; )
            for (j = m1->ncols; j--; )
                if (divide) {
                    double      d;
                    if (m2->ncomp == 1) {
                        d = rmx_lval(m2,i,j,0);
                        if (d == 0) {
                            ++zeroDivides;
                            for (k = m1->ncomp; k--; )
                                rmx_lval(m1,i,j,k) = 0;
                        } else {
                            d = 1./d;
                            for (k = m1->ncomp; k--; )
                                rmx_lval(m1,i,j,k) *= d;
                        }
                    } else
                        for (k = m1->ncomp; k--; ) {
                            d = rmx_lval(m2,i,j,k);
                            if (d == 0) {
                                ++zeroDivides;
                                rmx_lval(m1,i,j,k) = 0;
                            } else
                                rmx_lval(m1,i,j,k) /= d;
                        }
                } else {
                    if (m2->ncomp == 1) {
                        const double    d = rmx_lval(m2,i,j,0);
                        for (k = m1->ncomp; k--; )
                            rmx_lval(m1,i,j,k) *= d;
                    } else
                        for (k = m1->ncomp; k--; )
                            rmx_lval(m1,i,j,k) *= rmx_lval(m2,i,j,k);
                }
        if (zeroDivides) {
                rmx_addinfo(m1, "WARNING: zero divide(s) corrupted results\n");
                errno = ERANGE;
        }
        return(1);
}

/* Sum second matrix into first, applying scale factor beforehand */
int
rmx_sum(RMATRIX *msum, const RMATRIX *madd, const double sf[])
{
        double  *mysf = NULL;
        int     i, j, k;

        if (!msum | !madd ||
                        (msum->nrows != madd->nrows) |
                        (msum->ncols != madd->ncols) |
                        (msum->ncomp != madd->ncomp))
                return(0);
        if (!sf) {
                mysf = (double *)malloc(sizeof(double)*msum->ncomp);
                if (!mysf)
                        return(0);
                for (k = msum->ncomp; k--; )
                        mysf[k] = 1;
                sf = mysf;
        }
        i = rmx_newtype(msum->dtype, madd->dtype);
        if (i)
                msum->dtype = i;
        else
                rmx_addinfo(msum, rmx_mismatch_warn);
        for (i = msum->nrows; i--; )
            for (j = msum->ncols; j--; )
                for (k = msum->ncomp; k--; )
                     rmx_lval(msum,i,j,k) += sf[k] * rmx_lval(madd,i,j,k);
        if (mysf)
                free(mysf);
        return(1);
}

/* Scale the given matrix by the indicated scalar component vector */
int
rmx_scale(RMATRIX *rm, const double sf[])
{
        int     i, j, k;

        if (!rm | !sf)
                return(0);
        for (i = rm->nrows; i--; )
            for (j = rm->ncols; j--; )
                for (k = rm->ncomp; k--; )
                    rmx_lval(rm,i,j,k) *= sf[k];

        if (rm->info)
                rmx_addinfo(rm, "Applied scalar\n");
        return(1);
}

/* Allocate new matrix and apply component transformation */
RMATRIX *
rmx_transform(const RMATRIX *msrc, int n, const double cmat[])
{
        int     i, j, ks, kd;
        RMATRIX *dnew;

        if (!msrc | (n <= 0) | !cmat)
                return(NULL);
        dnew = rmx_alloc(msrc->nrows, msrc->ncols, n);
        if (!dnew)
                return(NULL);
        if (msrc->info) {
                char    buf[128];
                sprintf(buf, "Applied %dx%d component transform\n",
                                dnew->ncomp, msrc->ncomp);
                rmx_addinfo(dnew, msrc->info);
                rmx_addinfo(dnew, buf);
        }
        dnew->dtype = msrc->dtype;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; )
                for (kd = dnew->ncomp; kd--; ) {
                    double      d = 0;
                    for (ks = msrc->ncomp; ks--; )
                        d += cmat[kd*msrc->ncomp + ks] * rmx_lval(msrc,i,j,ks);
                    rmx_lval(dnew,i,j,kd) = d;
                }
        return(dnew);
}

/* Convert a color matrix to newly allocated RMATRIX buffer */
RMATRIX *
rmx_from_cmatrix(const CMATRIX *cm)
{
        int     i, j;
        RMATRIX *dnew;

        if (!cm)
                return(NULL);
        dnew = rmx_alloc(cm->nrows, cm->ncols, 3);
        if (!dnew)
                return(NULL);
        dnew->dtype = DTfloat;
        for (i = dnew->nrows; i--; )
            for (j = dnew->ncols; j--; ) {
                const COLORV    *cv = cm_lval(cm,i,j);
                rmx_lval(dnew,i,j,0) = cv[0];
                rmx_lval(dnew,i,j,1) = cv[1];
                rmx_lval(dnew,i,j,2) = cv[2];
            }
        return(dnew);
}

/* Convert general matrix to newly allocated CMATRIX buffer */
CMATRIX *
cm_from_rmatrix(const RMATRIX *rm)
{
        int     i, j;
        CMATRIX *cnew;

        if (!rm || rm->ncomp != 3)
                return(NULL);
        cnew = cm_alloc(rm->nrows, rm->ncols);
        if (!cnew)
                return(NULL);
        for (i = cnew->nrows; i--; )
            for (j = cnew->ncols; j--; ) {
                COLORV  *cv = cm_lval(cnew,i,j);
                cv[0] = (COLORV)rmx_lval(rm,i,j,0);
                cv[1] = (COLORV)rmx_lval(rm,i,j,1);
                cv[2] = (COLORV)rmx_lval(rm,i,j,2);
            }
        return(cnew);
}
Revision:	2.40
Committed:	Wed Mar 25 01:51:09 2020 UTC (4 years, 1 month ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.39:	+21 -2 lines
Log Message:	Changed rmtxop and dctimestep to undo any exposure on Radiance input pictures
#	User	Rev	Content
1	greg	2.1	#ifndef lint
2	greg	2.40	static const char RCSid[] = "$Id: rmatrix.c,v 2.39 2019/12/28 18:05:14 greg Exp $";
3	greg	2.1	#endif
4			/*
5			* General matrix operations.
6			*/
7
8			#include <stdlib.h>
9	greg	2.25	#include <errno.h>
10	greg	2.21	#include "rtio.h"
11	schorsch	2.20	#include "platform.h"
12	greg	2.1	#include "resolu.h"
13	greg	2.19	#include "paths.h"
14	greg	2.1	#include "rmatrix.h"
15
16	greg	2.6	static char rmx_mismatch_warn[] = "WARNING: data type mismatch\n";
17	greg	2.1
18			/* Allocate a nr x nc matrix with n components */
19			RMATRIX *
20			rmx_alloc(int nr, int nc, int n)
21			{
22			RMATRIX *dnew;
23
24			if ((nr <= 0) \| (nc <= 0) \| (n <= 0))
25			return(NULL);
26			dnew = (RMATRIX *)malloc(sizeof(RMATRIX)-sizeof(dnew->mtx) +
27			sizeof(dnew->mtx[0])(nnr*nc));
28	greg	2.33	if (!dnew)
29	greg	2.1	return(NULL);
30			dnew->nrows = nr; dnew->ncols = nc; dnew->ncomp = n;
31	greg	2.6	dnew->dtype = DTdouble;
32	greg	2.36	dnew->swapin = 0;
33	greg	2.5	dnew->info = NULL;
34	greg	2.1	return(dnew);
35			}
36
37	greg	2.6	/* Free a RMATRIX array */
38			void
39			rmx_free(RMATRIX *rm)
40			{
41			if (!rm) return;
42			if (rm->info)
43			free(rm->info);
44			free(rm);
45			}
46
47			/* Resolve data type based on two input types (returns 0 for mismatch) */
48			int
49			rmx_newtype(int dtyp1, int dtyp2)
50			{
51	greg	2.14	if ((dtyp1==DTxyze) \| (dtyp1==DTrgbe) \|
52			(dtyp2==DTxyze) \| (dtyp2==DTrgbe)
53			&& dtyp1 != dtyp2)
54	greg	2.6	return(0);
55			if (dtyp1 < dtyp2)
56			return(dtyp1);
57			return(dtyp2);
58			}
59
60	greg	2.5	/* Append header information associated with matrix data */
61			int
62			rmx_addinfo(RMATRIX rm, const char info)
63			{
64	greg	2.33	if (!rm \|\| !info \|\| !*info)
65	greg	2.5	return(0);
66	greg	2.8	if (!rm->info) {
67	greg	2.5	rm->info = (char *)malloc(strlen(info)+1);
68	greg	2.8	if (rm->info) rm->info[0] = '\0';
69			} else
70	greg	2.5	rm->info = (char *)realloc(rm->info,
71			strlen(rm->info)+strlen(info)+1);
72			if (!rm->info)
73			return(0);
74			strcat(rm->info, info);
75			return(1);
76			}
77
78	greg	2.1	static int
79			get_dminfo(char s, void p)
80			{
81	greg	2.6	RMATRIX ip = (RMATRIX )p;
82	greg	2.29	char fmt[MAXFMTLEN];
83	greg	2.1	int i;
84
85	greg	2.6	if (headidval(fmt, s))
86			return(0);
87	greg	2.1	if (!strncmp(s, "NCOMP=", 6)) {
88			ip->ncomp = atoi(s+6);
89			return(0);
90			}
91			if (!strncmp(s, "NROWS=", 6)) {
92			ip->nrows = atoi(s+6);
93			return(0);
94			}
95			if (!strncmp(s, "NCOLS=", 6)) {
96			ip->ncols = atoi(s+6);
97			return(0);
98			}
99	greg	2.35	if ((i = isbigendian(s)) >= 0) {
100			ip->swapin = (nativebigendian() != i);
101			return(0);
102			}
103	greg	2.40	if (isexpos(s)) {
104			double d = exposval(s);
105			scalecolor(ip->mtx, d);
106			return(0);
107			}
108			if (iscolcor(s)) {
109			COLOR ctmp;
110			colcorval(ctmp, s);
111			multcolor(ip->mtx, ctmp);
112			return(0);
113			}
114	greg	2.5	if (!formatval(fmt, s)) {
115	greg	2.6	rmx_addinfo(ip, s);
116	greg	2.1	return(0);
117	greg	2.5	}
118	greg	2.1	for (i = 1; i < DTend; i++)
119			if (!strcmp(fmt, cm_fmt_id[i])) {
120			ip->dtype = i;
121			return(0);
122			}
123			return(-1);
124			}
125
126			static int
127			rmx_load_ascii(RMATRIX rm, FILE fp)
128			{
129			int i, j, k;
130	greg	2.17
131	greg	2.1	for (i = 0; i < rm->nrows; i++)
132			for (j = 0; j < rm->ncols; j++)
133			for (k = 0; k < rm->ncomp; k++)
134			if (fscanf(fp, "%lf", &rmx_lval(rm,i,j,k)) != 1)
135			return(0);
136			return(1);
137			}
138
139			static int
140			rmx_load_float(RMATRIX rm, FILE fp)
141			{
142			int i, j, k;
143			float val[100];
144
145			if (rm->ncomp > 100) {
146			fputs("Unsupported # components in rmx_load_float()\n", stderr);
147			exit(1);
148			}
149			for (i = 0; i < rm->nrows; i++)
150			for (j = 0; j < rm->ncols; j++) {
151	greg	2.21	if (getbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
152	greg	2.1	return(0);
153	greg	2.35	if (rm->swapin)
154			swap32((char *)val, rm->ncomp);
155	greg	2.1	for (k = rm->ncomp; k--; )
156			rmx_lval(rm,i,j,k) = val[k];
157			}
158			return(1);
159			}
160
161			static int
162			rmx_load_double(RMATRIX rm, FILE fp)
163			{
164	greg	2.26	int i, j;
165	greg	2.1
166			for (i = 0; i < rm->nrows; i++)
167	greg	2.35	for (j = 0; j < rm->ncols; j++) {
168	greg	2.26	if (getbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
169	greg	2.1	return(0);
170	greg	2.35	if (rm->swapin)
171			swap64((char *)&rmx_lval(rm,i,j,0), rm->ncomp);
172			}
173	greg	2.1	return(1);
174			}
175
176			static int
177			rmx_load_rgbe(RMATRIX rm, FILE fp)
178			{
179			COLOR scan = (COLOR )malloc(sizeof(COLOR)*rm->ncols);
180			int i, j;
181
182	greg	2.33	if (!scan)
183	greg	2.1	return(0);
184			for (i = 0; i < rm->nrows; i++) {
185			if (freadscan(scan, rm->ncols, fp) < 0) {
186			free(scan);
187			return(0);
188			}
189			for (j = rm->ncols; j--; ) {
190			rmx_lval(rm,i,j,0) = colval(scan[j],RED);
191			rmx_lval(rm,i,j,1) = colval(scan[j],GRN);
192			rmx_lval(rm,i,j,2) = colval(scan[j],BLU);
193			}
194			}
195			free(scan);
196			return(1);
197			}
198
199			/* Load matrix from supported file type */
200			RMATRIX *
201	greg	2.13	rmx_load(const char *inspec)
202	greg	2.1	{
203			FILE *fp = stdin;
204	greg	2.6	RMATRIX dinfo;
205	greg	2.1	RMATRIX *dnew;
206
207	greg	2.33	if (!inspec) { /* reading from stdin? */
208	greg	2.13	inspec = "<stdin>";
209	greg	2.22	SET_FILE_BINARY(stdin);
210	greg	2.13	} else if (inspec[0] == '!') {
211	greg	2.33	if (!(fp = popen(inspec+1, "r")))
212	greg	2.13	return(NULL);
213	greg	2.37	SET_FILE_BINARY(fp);
214	greg	2.1	} else {
215	greg	2.13	const char sp = inspec; / check suffix */
216	greg	2.1	while (*sp)
217			++sp;
218	greg	2.13	while (sp > inspec && sp[-1] != '.')
219	greg	2.1	--sp;
220			if (!strcasecmp(sp, "XML")) { /* assume it's a BSDF */
221	greg	2.13	CMATRIX cm = cm_loadBTDF((char )inspec);
222	greg	2.33	if (!cm)
223	greg	2.1	return(NULL);
224			dnew = rmx_from_cmatrix(cm);
225			cm_free(cm);
226	greg	2.18	dnew->dtype = DTascii;
227	greg	2.1	return(dnew);
228			}
229			/* else open it ourselves */
230	greg	2.33	if (!(fp = fopen(inspec, "rb")))
231	greg	2.1	return(NULL);
232			}
233			#ifdef getc_unlocked
234			flockfile(fp);
235			#endif
236			dinfo.nrows = dinfo.ncols = dinfo.ncomp = 0;
237	greg	2.6	dinfo.dtype = DTascii; /* assumed w/o FORMAT */
238	greg	2.35	dinfo.swapin = 0;
239	greg	2.6	dinfo.info = NULL;
240	greg	2.40	dinfo.mtx[0] = dinfo.mtx[1] = dinfo.mtx[2] = 1.;
241	greg	2.3	if (getheader(fp, get_dminfo, &dinfo) < 0) {
242	greg	2.1	fclose(fp);
243			return(NULL);
244			}
245	greg	2.4	if ((dinfo.nrows <= 0) \| (dinfo.ncols <= 0)) {
246	greg	2.1	if (!fscnresolu(&dinfo.ncols, &dinfo.nrows, fp)) {
247			fclose(fp);
248			return(NULL);
249			}
250	greg	2.4	if (dinfo.ncomp <= 0)
251			dinfo.ncomp = 3;
252			else if ((dinfo.dtype == DTrgbe) \| (dinfo.dtype == DTxyze) &&
253			dinfo.ncomp != 3) {
254			fclose(fp);
255			return(NULL);
256			}
257	greg	2.1	}
258			dnew = rmx_alloc(dinfo.nrows, dinfo.ncols, dinfo.ncomp);
259	greg	2.33	if (!dnew) {
260	greg	2.1	fclose(fp);
261			return(NULL);
262			}
263	greg	2.6	dnew->info = dinfo.info;
264	greg	2.1	switch (dinfo.dtype) {
265			case DTascii:
266	greg	2.37	SET_FILE_TEXT(fp);
267	greg	2.1	if (!rmx_load_ascii(dnew, fp))
268			goto loaderr;
269	greg	2.11	dnew->dtype = DTascii; /* should leave double? */
270	greg	2.1	break;
271			case DTfloat:
272	greg	2.35	dnew->swapin = dinfo.swapin;
273	greg	2.1	if (!rmx_load_float(dnew, fp))
274			goto loaderr;
275	greg	2.6	dnew->dtype = DTfloat;
276	greg	2.1	break;
277			case DTdouble:
278	greg	2.35	dnew->swapin = dinfo.swapin;
279	greg	2.1	if (!rmx_load_double(dnew, fp))
280			goto loaderr;
281	greg	2.6	dnew->dtype = DTdouble;
282	greg	2.1	break;
283			case DTrgbe:
284			case DTxyze:
285			if (!rmx_load_rgbe(dnew, fp))
286			goto loaderr;
287	greg	2.40	dnew->dtype = dinfo.dtype; /* undo exposure? */
288			if ((dinfo.mtx[0] != 1.) \| (dinfo.mtx[1] != 1.) \|
289			(dinfo.mtx[2] != 1.)) {
290			dinfo.mtx[0] = 1./dinfo.mtx[0];
291			dinfo.mtx[1] = 1./dinfo.mtx[1];
292			dinfo.mtx[2] = 1./dinfo.mtx[2];
293			rmx_scale(dnew, dinfo.mtx);
294			}
295	greg	2.1	break;
296			default:
297			goto loaderr;
298			}
299	greg	2.13	if (fp != stdin) {
300			if (inspec[0] == '!')
301			pclose(fp);
302			else
303			fclose(fp);
304			}
305			#ifdef getc_unlocked
306			else
307			funlockfile(fp);
308			#endif
309	greg	2.1	return(dnew);
310			loaderr: /* should report error? */
311	greg	2.13	if (inspec[0] == '!')
312			pclose(fp);
313			else
314			fclose(fp);
315	greg	2.1	rmx_free(dnew);
316			return(NULL);
317			}
318
319			static int
320			rmx_write_ascii(const RMATRIX rm, FILE fp)
321			{
322	greg	2.30	const char *fmt = (rm->dtype == DTfloat) ? " %.7e" :
323			(rm->dtype == DTrgbe) \| (rm->dtype == DTxyze) ? " %.3e" :
324			" %.15e" ;
325	greg	2.1	int i, j, k;
326	greg	2.17
327	greg	2.1	for (i = 0; i < rm->nrows; i++) {
328			for (j = 0; j < rm->ncols; j++) {
329			for (k = 0; k < rm->ncomp; k++)
330	greg	2.30	fprintf(fp, fmt, rmx_lval(rm,i,j,k));
331	greg	2.1	fputc('\t', fp);
332			}
333			fputc('\n', fp);
334			}
335			return(1);
336			}
337
338			static int
339			rmx_write_float(const RMATRIX rm, FILE fp)
340			{
341			int i, j, k;
342			float val[100];
343
344			if (rm->ncomp > 100) {
345			fputs("Unsupported # components in rmx_write_float()\n", stderr);
346			exit(1);
347			}
348			for (i = 0; i < rm->nrows; i++)
349			for (j = 0; j < rm->ncols; j++) {
350			for (k = rm->ncomp; k--; )
351			val[k] = (float)rmx_lval(rm,i,j,k);
352	greg	2.21	if (putbinary(val, sizeof(val[0]), rm->ncomp, fp) != rm->ncomp)
353	greg	2.1	return(0);
354			}
355			return(1);
356			}
357
358			static int
359			rmx_write_double(const RMATRIX rm, FILE fp)
360			{
361	greg	2.26	int i, j;
362	greg	2.1
363			for (i = 0; i < rm->nrows; i++)
364	greg	2.26	for (j = 0; j < rm->ncols; j++)
365			if (putbinary(&rmx_lval(rm,i,j,0), sizeof(double), rm->ncomp, fp) != rm->ncomp)
366	greg	2.1	return(0);
367			return(1);
368			}
369
370			static int
371			rmx_write_rgbe(const RMATRIX rm, FILE fp)
372			{
373	greg	2.27	COLR scan = (COLR )malloc(sizeof(COLR)*rm->ncols);
374	greg	2.1	int i, j;
375
376	greg	2.33	if (!scan)
377	greg	2.1	return(0);
378			for (i = 0; i < rm->nrows; i++) {
379			for (j = rm->ncols; j--; )
380	greg	2.27	setcolr(scan[j], rmx_lval(rm,i,j,0),
381	greg	2.1	rmx_lval(rm,i,j,1),
382			rmx_lval(rm,i,j,2) );
383	greg	2.27	if (fwritecolrs(scan, rm->ncols, fp) < 0) {
384	greg	2.1	free(scan);
385			return(0);
386			}
387			}
388			free(scan);
389			return(1);
390			}
391
392	greg	2.6	/* Write matrix to file type indicated by dtype */
393	greg	2.10	int
394	greg	2.1	rmx_write(const RMATRIX rm, int dtype, FILE fp)
395			{
396			RMATRIX *mydm = NULL;
397			int ok = 1;
398
399	greg	2.33	if (!rm \| !fp)
400	greg	2.1	return(0);
401	greg	2.17	#ifdef getc_unlocked
402			flockfile(fp);
403			#endif
404	greg	2.1	/* complete header */
405	greg	2.5	if (rm->info)
406			fputs(rm->info, fp);
407	greg	2.6	if (dtype == DTfromHeader)
408			dtype = rm->dtype;
409			else if ((dtype == DTrgbe) & (rm->dtype == DTxyze))
410			dtype = DTxyze;
411	greg	2.9	else if ((dtype == DTxyze) & (rm->dtype == DTrgbe))
412	greg	2.6	dtype = DTrgbe;
413	greg	2.1	if ((dtype != DTrgbe) & (dtype != DTxyze)) {
414			fprintf(fp, "NROWS=%d\n", rm->nrows);
415			fprintf(fp, "NCOLS=%d\n", rm->ncols);
416			fprintf(fp, "NCOMP=%d\n", rm->ncomp);
417			} else if (rm->ncomp != 3) { /* wrong # components? */
418			double cmtx[3];
419			if (rm->ncomp != 1) /* only convert grayscale */
420			return(0);
421			cmtx[0] = cmtx[1] = cmtx[2] = 1;
422			mydm = rmx_transform(rm, 3, cmtx);
423	greg	2.33	if (!mydm)
424	greg	2.1	return(0);
425			rm = mydm;
426			}
427	greg	2.35	if ((dtype == DTfloat) \| (dtype == DTdouble))
428			fputendian(fp); /* important to record */
429	greg	2.1	fputformat((char *)cm_fmt_id[dtype], fp);
430			fputc('\n', fp);
431			switch (dtype) { /* write data */
432			case DTascii:
433			ok = rmx_write_ascii(rm, fp);
434			break;
435			case DTfloat:
436			ok = rmx_write_float(rm, fp);
437			break;
438			case DTdouble:
439			ok = rmx_write_double(rm, fp);
440			break;
441			case DTrgbe:
442			case DTxyze:
443			fprtresolu(rm->ncols, rm->nrows, fp);
444			ok = rmx_write_rgbe(rm, fp);
445			break;
446			default:
447			return(0);
448			}
449			ok &= (fflush(fp) == 0);
450	greg	2.17	#ifdef getc_unlocked
451			funlockfile(fp);
452			#endif
453	greg	2.33	if (mydm)
454			rmx_free(mydm);
455	greg	2.10	return(ok);
456	greg	2.1	}
457
458			/* Allocate and assign square identity matrix with n components */
459			RMATRIX *
460			rmx_identity(const int dim, const int n)
461			{
462			RMATRIX *rid = rmx_alloc(dim, dim, n);
463	greg	2.12	int i, k;
464	greg	2.1
465	greg	2.33	if (!rid)
466	greg	2.1	return(NULL);
467	greg	2.12	memset(rid->mtx, 0, sizeof(rid->mtx[0])ndim*dim);
468	greg	2.1	for (i = dim; i--; )
469	greg	2.12	for (k = n; k--; )
470			rmx_lval(rid,i,i,k) = 1;
471	greg	2.1	return(rid);
472			}
473
474			/* Duplicate the given matrix */
475			RMATRIX *
476			rmx_copy(const RMATRIX *rm)
477			{
478			RMATRIX *dnew;
479
480	greg	2.33	if (!rm)
481	greg	2.1	return(NULL);
482			dnew = rmx_alloc(rm->nrows, rm->ncols, rm->ncomp);
483	greg	2.33	if (!dnew)
484	greg	2.1	return(NULL);
485	greg	2.5	rmx_addinfo(dnew, rm->info);
486	greg	2.6	dnew->dtype = rm->dtype;
487	greg	2.1	memcpy(dnew->mtx, rm->mtx,
488			sizeof(rm->mtx[0])rm->ncomprm->nrows*rm->ncols);
489			return(dnew);
490			}
491
492	greg	2.2	/* Allocate and assign transposed matrix */
493			RMATRIX *
494			rmx_transpose(const RMATRIX *rm)
495	greg	2.1	{
496	greg	2.2	RMATRIX *dnew;
497	greg	2.1	int i, j, k;
498
499	greg	2.33	if (!rm)
500	greg	2.1	return(0);
501	greg	2.31	if ((rm->nrows == 1) \| (rm->ncols == 1)) {
502			dnew = rmx_copy(rm);
503	greg	2.33	if (!dnew)
504	greg	2.32	return(NULL);
505	greg	2.31	dnew->nrows = rm->ncols;
506			dnew->ncols = rm->nrows;
507			return(dnew);
508			}
509	greg	2.2	dnew = rmx_alloc(rm->ncols, rm->nrows, rm->ncomp);
510	greg	2.33	if (!dnew)
511	greg	2.2	return(NULL);
512	greg	2.5	if (rm->info) {
513			rmx_addinfo(dnew, rm->info);
514			rmx_addinfo(dnew, "Transposed rows and columns\n");
515			}
516	greg	2.6	dnew->dtype = rm->dtype;
517	greg	2.2	for (i = dnew->nrows; i--; )
518			for (j = dnew->ncols; j--; )
519			for (k = dnew->ncomp; k--; )
520			rmx_lval(dnew,i,j,k) = rmx_lval(rm,j,i,k);
521			return(dnew);
522	greg	2.1	}
523
524			/* Multiply (concatenate) two matrices and allocate the result */
525			RMATRIX *
526			rmx_multiply(const RMATRIX m1, const RMATRIX m2)
527			{
528			RMATRIX *mres;
529			int i, j, k, h;
530
531	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncomp != m2->ncomp) \| (m1->ncols != m2->nrows))
532	greg	2.1	return(NULL);
533			mres = rmx_alloc(m1->nrows, m2->ncols, m1->ncomp);
534	greg	2.33	if (!mres)
535	greg	2.1	return(NULL);
536	greg	2.6	i = rmx_newtype(m1->dtype, m2->dtype);
537			if (i)
538			mres->dtype = i;
539			else
540			rmx_addinfo(mres, rmx_mismatch_warn);
541	greg	2.1	for (i = mres->nrows; i--; )
542			for (j = mres->ncols; j--; )
543	greg	2.8	for (k = mres->ncomp; k--; ) {
544	greg	2.1	long double d = 0;
545	greg	2.8	for (h = m1->ncols; h--; )
546	greg	2.24	d += rmx_lval(m1,i,h,k) * rmx_lval(m2,h,j,k);
547	greg	2.1	rmx_lval(mres,i,j,k) = (double)d;
548			}
549			return(mres);
550			}
551
552	greg	2.25	/* Element-wise multiplication (or division) of m2 into m1 */
553			int
554			rmx_elemult(RMATRIX m1, const RMATRIX m2, int divide)
555			{
556			int zeroDivides = 0;
557			int i, j, k;
558
559	greg	2.33	if (!m1 \| !m2 \|\| (m1->ncols != m2->ncols) \| (m1->nrows != m2->nrows))
560	greg	2.25	return(0);
561			if ((m2->ncomp > 1) & (m2->ncomp != m1->ncomp))
562			return(0);
563			i = rmx_newtype(m1->dtype, m2->dtype);
564			if (i)
565			m1->dtype = i;
566			else
567			rmx_addinfo(m1, rmx_mismatch_warn);
568			for (i = m1->nrows; i--; )
569			for (j = m1->ncols; j--; )
570			if (divide) {
571			double d;
572			if (m2->ncomp == 1) {
573			d = rmx_lval(m2,i,j,0);
574			if (d == 0) {
575			++zeroDivides;
576			for (k = m1->ncomp; k--; )
577			rmx_lval(m1,i,j,k) = 0;
578			} else {
579			d = 1./d;
580			for (k = m1->ncomp; k--; )
581			rmx_lval(m1,i,j,k) *= d;
582			}
583			} else
584			for (k = m1->ncomp; k--; ) {
585			d = rmx_lval(m2,i,j,k);
586			if (d == 0) {
587			++zeroDivides;
588			rmx_lval(m1,i,j,k) = 0;
589			} else
590			rmx_lval(m1,i,j,k) /= d;
591			}
592			} else {
593			if (m2->ncomp == 1) {
594			const double d = rmx_lval(m2,i,j,0);
595			for (k = m1->ncomp; k--; )
596			rmx_lval(m1,i,j,k) *= d;
597			} else
598			for (k = m1->ncomp; k--; )
599			rmx_lval(m1,i,j,k) *= rmx_lval(m2,i,j,k);
600			}
601			if (zeroDivides) {
602	greg	2.34	rmx_addinfo(m1, "WARNING: zero divide(s) corrupted results\n");
603	greg	2.25	errno = ERANGE;
604			}
605			return(1);
606			}
607
608	greg	2.1	/* Sum second matrix into first, applying scale factor beforehand */
609			int
610			rmx_sum(RMATRIX msum, const RMATRIX madd, const double sf[])
611			{
612			double *mysf = NULL;
613			int i, j, k;
614
615	greg	2.33	if (!msum \| !madd \|\|
616	greg	2.1	(msum->nrows != madd->nrows) \|
617			(msum->ncols != madd->ncols) \|
618			(msum->ncomp != madd->ncomp))
619			return(0);
620	greg	2.33	if (!sf) {
621	greg	2.1	mysf = (double )malloc(sizeof(double)msum->ncomp);
622	greg	2.33	if (!mysf)
623	greg	2.1	return(0);
624			for (k = msum->ncomp; k--; )
625			mysf[k] = 1;
626			sf = mysf;
627			}
628	greg	2.6	i = rmx_newtype(msum->dtype, madd->dtype);
629			if (i)
630			msum->dtype = i;
631			else
632			rmx_addinfo(msum, rmx_mismatch_warn);
633	greg	2.1	for (i = msum->nrows; i--; )
634			for (j = msum->ncols; j--; )
635			for (k = msum->ncomp; k--; )
636			rmx_lval(msum,i,j,k) += sf[k] * rmx_lval(madd,i,j,k);
637	greg	2.33	if (mysf)
638			free(mysf);
639	greg	2.1	return(1);
640			}
641
642			/* Scale the given matrix by the indicated scalar component vector */
643			int
644			rmx_scale(RMATRIX *rm, const double sf[])
645			{
646			int i, j, k;
647
648	greg	2.33	if (!rm \| !sf)
649	greg	2.1	return(0);
650			for (i = rm->nrows; i--; )
651			for (j = rm->ncols; j--; )
652			for (k = rm->ncomp; k--; )
653			rmx_lval(rm,i,j,k) *= sf[k];
654
655	greg	2.28	if (rm->info)
656			rmx_addinfo(rm, "Applied scalar\n");
657	greg	2.1	return(1);
658			}
659
660			/* Allocate new matrix and apply component transformation */
661			RMATRIX *
662			rmx_transform(const RMATRIX *msrc, int n, const double cmat[])
663			{
664			int i, j, ks, kd;
665			RMATRIX *dnew;
666
667	greg	2.33	if (!msrc \| (n <= 0) \| !cmat)
668	greg	2.1	return(NULL);
669			dnew = rmx_alloc(msrc->nrows, msrc->ncols, n);
670	greg	2.33	if (!dnew)
671	greg	2.1	return(NULL);
672	greg	2.28	if (msrc->info) {
673			char buf[128];
674	greg	2.38	sprintf(buf, "Applied %dx%d component transform\n",
675	greg	2.28	dnew->ncomp, msrc->ncomp);
676			rmx_addinfo(dnew, msrc->info);
677			rmx_addinfo(dnew, buf);
678			}
679	greg	2.6	dnew->dtype = msrc->dtype;
680	greg	2.1	for (i = dnew->nrows; i--; )
681			for (j = dnew->ncols; j--; )
682			for (kd = dnew->ncomp; kd--; ) {
683			double d = 0;
684			for (ks = msrc->ncomp; ks--; )
685			d += cmat[kdmsrc->ncomp + ks] rmx_lval(msrc,i,j,ks);
686			rmx_lval(dnew,i,j,kd) = d;
687			}
688			return(dnew);
689			}
690
691			/* Convert a color matrix to newly allocated RMATRIX buffer */
692			RMATRIX *
693			rmx_from_cmatrix(const CMATRIX *cm)
694			{
695			int i, j;
696			RMATRIX *dnew;
697
698	greg	2.33	if (!cm)
699	greg	2.1	return(NULL);
700			dnew = rmx_alloc(cm->nrows, cm->ncols, 3);
701	greg	2.33	if (!dnew)
702	greg	2.1	return(NULL);
703	greg	2.6	dnew->dtype = DTfloat;
704	greg	2.1	for (i = dnew->nrows; i--; )
705			for (j = dnew->ncols; j--; ) {
706			const COLORV *cv = cm_lval(cm,i,j);
707			rmx_lval(dnew,i,j,0) = cv[0];
708			rmx_lval(dnew,i,j,1) = cv[1];
709			rmx_lval(dnew,i,j,2) = cv[2];
710			}
711			return(dnew);
712			}
713
714			/* Convert general matrix to newly allocated CMATRIX buffer */
715			CMATRIX *
716			cm_from_rmatrix(const RMATRIX *rm)
717			{
718			int i, j;
719			CMATRIX *cnew;
720
721	greg	2.33	if (!rm \|\| rm->ncomp != 3)
722	greg	2.1	return(NULL);
723			cnew = cm_alloc(rm->nrows, rm->ncols);
724	greg	2.33	if (!cnew)
725	greg	2.1	return(NULL);
726			for (i = cnew->nrows; i--; )
727			for (j = cnew->ncols; j--; ) {
728			COLORV *cv = cm_lval(cnew,i,j);
729			cv[0] = (COLORV)rmx_lval(rm,i,j,0);
730			cv[1] = (COLORV)rmx_lval(rm,i,j,1);
731			cv[2] = (COLORV)rmx_lval(rm,i,j,2);
732			}
733			return(cnew);
734			}