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/* RCSid $Id: cmatrix.h,v 2.15 2025/04/04 18:06:48 greg Exp $ */
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/*
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* Color matrix routine declarations.
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*
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* G. Ward
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*/
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#ifndef _RAD_CMATRIX_H_
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#define _RAD_CMATRIX_H_
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#include <sys/types.h>
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#include "color.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Data types for file loading (used to be an enum) */
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#define DTfromHeader 0
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#define DTrgbe 1
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#define DTxyze 2
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#define DTspec 3
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#define DTfloat 4
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#define DTascii 5
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#define DTdouble 6
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#define DTend 7
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/* Defined in cmconst.c */
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extern const char stdin_name[];
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extern const char *cm_fmt_id[];
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extern const int cm_elem_size[];
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/* A color coefficient matrix -- vectors have ncols==1 */
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typedef struct {
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int nrows, ncols;
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COLORV cmem[3]; /* extends struct */
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} CMATRIX;
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#define COLSPEC (sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf")
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#define cm_lval(cm,r,c) ((cm)->cmem + 3*((size_t)(r)*(cm)->ncols + (c)))
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#define cv_lval(cm,i) ((cm)->cmem + 3*(i))
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/* Allocate a color coefficient matrix */
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extern CMATRIX *cm_alloc(int nrows, int ncols);
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/* Resize color coefficient matrix */
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extern CMATRIX *cm_resize(CMATRIX *cm, int nrows);
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#define cm_free(cm) free(cm)
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/* Load header to obtain/check data type and matrix dimensions */
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extern char *cm_getheader(int *dt, int *nr, int *nc,
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int *swp, COLOR scale, FILE *fp);
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/* Allocate and load a matrix from the given input (or stdin if NULL) */
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extern CMATRIX *cm_load(const char *inspec, int nrows, int ncols, int dtype);
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/* Extract a column vector from a matrix */
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extern CMATRIX *cm_column(const CMATRIX *cm, int c);
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/* Multiply two matrices (or a matrix and a vector) and allocate the result */
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extern CMATRIX *cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2);
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/* write out matrix to file (precede by resolution string if picture) */
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extern int cm_write(const CMATRIX *cm, int dtype, FILE *fp);
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/* Load and convert a matrix BTDF from the given XML file */
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extern CMATRIX *cm_loadBTDF(const char *fname);
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/* Load and convert a matrix BRDF from the given XML file */
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extern CMATRIX *cm_loadBRDF(const char *fname, int backside);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_CMATRIX_H_ */
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