
/* 
 * Argyll Color Correction System
 * Multi-dimensional counter macros.
 *
 * Author: Graeme W. Gill
 * Date:   28/9/96
 *
 * Copyright 1996 - 2006, Graeme W. Gill
 * All rights reserved.
 *
 * This material is licenced under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 :-
 * see the License.txt file for licencing details.
 */

#ifndef COUNTERS_H

#ifdef __cplusplus
	extern "C" {
#endif

/* ------------------------------------------------------- */
/* Macros for a multi-dimensional counter. */
/* Declare the counter name nn, maximum di mxdi, dimensions di, & count */

#define DCOUNT(nn, mxdi, di, start, reset, endp1) 			\
	int nn[mxdi];			/* counter value */				\
	int nn##_di = (di);		/* Number of dimensions */		\
	int nn##_stt = (start);	/* start count value */			\
	int nn##_rst = (reset);	/* reset on carry value */		\
	int nn##_res = (endp1); /* last count +1 */				\
	int nn##_e				/* dimension index */

#define DRECONF(nn, start, reset, endp1) 				\
	nn##_stt = (start);	/* start count value */			\
	nn##_rst = (reset);	/* reset on carry value */		\
	nn##_res = (endp1); /* last count +1 */			

/* Set the counter value to 0 */
#define DC_INIT(nn) 								\
{													\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++)	\
		nn[nn##_e] = nn##_stt;						\
	nn##_e = 0;										\
}

/* Increment the counter value */
#define DC_INC(nn)									\
{													\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++) {	\
		nn[nn##_e]++;								\
		if (nn[nn##_e] < nn##_res)					\
			break;	/* No carry */					\
		nn[nn##_e] = nn##_rst;						\
	}												\
}

/* After init or increment, expression is TRUE if counter is done */
#define DC_DONE(nn)									\
	(nn##_e >= nn##_di)

/* Typical use:

	DCOUNT(cc, 15, 3, -1, -1, 2);

	DC_INIT(cc);
   	while(!DC_DONE(cc)) {

		DC_INC(cc);
	}
 */
	
/* (Do we need a version of the above that tracks the actual input coords ?) */

/* ------------------------------------------------------- */
/* Similar to abovem but each dimension range can be clipped. */

#define FCOUNT(nn, mxdi, di) 				\
	int nn[mxdi];			/* counter value */				\
	int nn##_di = (di);		/* Number of dimensions */		\
	int nn##_stt[mxdi];		/* start count value */			\
	int nn##_res[mxdi]; 	/* last count +1 */				\
	int nn##_e				/* dimension index */

/* Set start and end+1 to uniform values */
#define FRECONF(nn, start, endp1) 							\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++) {			\
		nn##_stt[nn##_e] = (start);	/* start count value */	\
		nn##_res[nn##_e] = (endp1); /* last count +1 */		\
	}

/* Set start and end+1 to individual values */
#define FRECONFA(nn, start, endp1) 							\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++) {			\
		nn##_stt[nn##_e] = (start)[nn##_e];	/* start count value */	\
		nn##_res[nn##_e] = (endp1)[nn##_e]; /* last count +1 */		\
	}

/* Set the counter value to 0 */
#define FC_INIT(nn) 								\
{													\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++)	\
		nn[nn##_e] = nn##_stt[nn##_e];				\
	nn##_e = 0;										\
}

/* Increment the counter value */
#define FC_INC(nn)									\
{													\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++) {	\
		nn[nn##_e]++;								\
		if (nn[nn##_e] < nn##_res[nn##_e])			\
			break;	/* No carry */					\
		nn[nn##_e] = nn##_stt[nn##_e];				\
	}												\
}

/* After increment, expression is TRUE if counter is done */
#define FC_DONE(nn)								\
	(nn##_e >= nn##_di)

/* ------------------------------------------------------- */
/* Same as above, but allows for variable resolution on each axis. */
/* End offset is added to count[] */
/* (Hmm. Could merge FCOUNT and ECOUNT ?) */

#define ECOUNT(nn, mxdi, di, start, endp1, end_offst)		\
	int nn[mxdi];	/* counter value */						\
	int nn##_di = (di);		/* Number of dimensions */		\
	int nn##_start = (start);/* Start value*/				\
	int *nn##_res = (endp1);/* last count +1 */				\
	int nn##_endo = (end_offst);/* Count offset */			\
	int nn##_e				/* dimension index */

/* Set the counter value to start */
#define EC_INIT(nn) 								\
{													\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++)	\
		nn[nn##_e] = nn##_start;					\
	nn##_e = 0;										\
}

/* Increment the counter value */
#define EC_INC(nn)											\
{															\
	for (nn##_e = 0; nn##_e < nn##_di; nn##_e++) {			\
		nn[nn##_e]++;										\
		if (nn[nn##_e] < (nn##_res[nn##_e] + nn##_endo))	\
			break;	/* No carry */							\
		nn[nn##_e] = nn##_start;							\
	}														\
}

/* After increment, expression is TRUE if counter is done */
#define EC_DONE(nn)									\
	(nn##_e >= nn##_di)
	
/* (Do we need a version of the above that tracks the actual input coords ?) */

/* ------------------------------------------------------- */
/* Macros combination counter */
/* Declare the counter name nn, combinations out of total */
/* mxdi should be set to maximum combinations. */

/* e.g. if there are 8 objects, and we want all combinations */
/* of 4 out of the 8, we would use: COMBO(nn, 4, 4, 8) */

/* Declare and initialize */
#define COMBO(nn, mxdi, comb, total) 				\
	int nn[mxdi+2];			/* counter value */				\
	int nn##_cmb = (comb);	/* number of combinations */	\
	int nn##_tot = (total);	/* out of total possible */		\
	int nn##_e				/* dimension index */

/* Declare, but don't initialize */
#define COMBO_DEC(nn, mxdi) 								\
	int nn[mxdi+2];			/* counter value */				\
	int nn##_cmb;			/* number of combinations */	\
	int nn##_tot;			/* out of total possible */		\
	int nn##_e				/* dimension index */

/* Set combinations to new setting */
#define CB_SETC(nn, comb)					 		\
	nn##_cmb = (comb)	/* number of combinations*/

/* Set total to new setting */
#define CB_SETT(nn, total)					 		\
	nn##_tot = (total)	/* total possible */

/* Set the counter to its initial value */
#define CB_INIT(nn) 								\
{													\
	for (nn##_e = 0; nn##_e < nn##_cmb; nn##_e++)	\
		nn[nn##_e] = nn##_cmb-nn##_e-1;				\
	nn##_e = 0;										\
}

/* Increment the counter value */
#define CB_INC(nn)									\
{													\
	for (nn##_e = 0; nn##_e < nn##_cmb; nn##_e++) {	\
		nn[nn##_e]++;								\
		if (nn[nn##_e] < (nn##_tot-nn##_e)) {		\
			int _combo_ee;		/* No carry */		\
			for (_combo_ee = nn##_e-1; _combo_ee >= 0; _combo_ee--)	\
				nn[_combo_ee] = nn[_combo_ee+1] + 1;	\
			break;									\
		}											\
	}												\
}

/* After init or increment, expression is TRUE if counter is done */
#define CB_DONE(nn)									\
	(nn##_e >= nn##_cmb)

/* ------------------------------------------------------- */
/* Macros simplex combination counter. */
/* Based on COMBO, but skips invalid simplex combinations */

#define XCOMBO(nn, mxdi, comb, total) 						\
		 COMBO(nn, mxdi, comb, total)

/* Set total to new setting */
#define XCB_SETT(nn, total)					 			\
         CB_SETT(nn, total)

/* Set combinations to new setting */
#define XCB_SETC(nn, comb)					 			\
         CB_SETC(nn, comb)


/* Set the counter to its initial value */
#define XCB_INIT(nn) 									\
{														\
	int nn##_ii;										\
														\
	for (nn##_e = 0; nn##_e < nn##_cmb; nn##_e++)		\
		nn[nn##_e] = nn##_cmb-nn##_e-1;					\
	for (nn##_ii = 1; nn##_ii < nn##_cmb; nn##_ii++) {	\
		if ((nn[nn##_ii-1] ^ nn[nn##_ii]) & nn[nn##_ii])\
			break;	/* Went from 0 to 1 */				\
	}													\
	if (nn##_ii < nn##_cmb)	{ /* Fix invalid combination */	\
		XCB_INC(nn);									\
	}													\
	nn##_e = 0;											\
}

/* Increment the counter value */
#define XCB_INC(nn)										\
{														\
	int nn##_ii = 0;									\
														\
	while (nn##_ii < nn##_cmb) {						\
		for (nn##_e = 0; nn##_e < nn##_cmb; nn##_e++) {	\
			nn[nn##_e]++;								\
			if (nn[nn##_e] < (nn##_tot-nn##_e)) {		\
				int nn##_ee;		/* No carry */		\
				for (nn##_ee = nn##_e-1; nn##_ee >= 0; nn##_ee--)	\
					nn[nn##_ee] = nn[nn##_ee+1] + 1;	\
				break;									\
			}											\
		}												\
		if (nn##_e >= nn##_cmb)							\
			break;		/* Done */						\
														\
		/* Reject invalid combinations */				\
		for (nn##_ii = 1; nn##_ii < nn##_cmb; nn##_ii++) {		\
			if ((nn[nn##_ii-1] ^ nn[nn##_ii]) & nn[nn##_ii]) 	\
				break;	/* Went from 0 to 1 */			\
		}												\
	}													\
}

/* After init or increment, expression is TRUE if counter is done */
#define XCB_DONE(nn)									\
         CB_DONE(nn)
	
/* ------------------------------------------------------- */
/* Macros permutation counter */
/* Declare the counter name nn, number of elements to be permuted */
/* maxnum should be set to maximum number of elements. */

/* Declare and initialize */
#define PERMUT(nn, maxnum, num) 							\
	int nn[maxnum];			/* permutation counter */		\
	int nn##p[maxnum];		/* permutation indexes  */		\
	int nn##_num = (num);	/* number of elements */		\
	int nn##_i				/* dimension index */

/* Set the counter to its initial value */
#define PU_INIT(nn) { 								\
	for (nn##_i = 0; nn##_i < nn##_num; nn##_i++) {	\
		nn[nn##_i] = nn##_i;						\
		nn##p[nn##_i] = 0;							\
	}												\
	nn##_i = 0;										\
}

/* Increment the counter value */
#define PU_INC(nn) {										\
	int nn##_tt;											\
	while (nn##_i < nn##_num && nn##p[nn##_i] >= nn##_i)	\
		nn##p[nn##_i++] = 0;								\
	if (nn##_i >= nn##_num)									\
		break;												\
	if (!(nn##_i & 1))										\
		nn##_tt = nn[0], nn[0] = nn[nn##_i], nn[nn##_i] = nn##_tt;	\
	else													\
		nn##_tt = nn[nn##p[nn##_i]], nn[nn##p[nn##_i]] = nn[nn##_i], nn[nn##_i] = nn##_tt;	\
	nn##p[nn##_i]++;										\
	nn##_i = 0;												\
}

/* After init or increment, expression is TRUE if counter is done */
#define PU_DONE(nn)											\
	(nn##_i >= nn##_num)

#ifdef __cplusplus
	}
#endif

#define COUNTERS_H
#endif /* COUNTERS_H */
