src/match_four.c

#include "match.h"
#include <limits.h>

typedef unsigned char u8;
typedef unsigned int u32;

/* generated by mtdev-kernel - do not edit */
static const u8 match_data[] = {
	0, 0, 1, 0, 1, 2, 0, 1, 2, 3, 0, 0, 0, 0, 1, 1,
	1, 0, 0, 0, 1, 2, 1, 1, 0, 2, 2, 1, 2, 0, 0, 0,
	1, 2, 3, 1, 1, 0, 2, 3, 2, 1, 2, 0, 3, 3, 1, 2,
	3, 0, 0, 0, 1, 1, 1, 2, 1, 0, 0, 3, 0, 1, 1, 3,
	1, 0, 2, 2, 3, 1, 2, 0, 0, 4, 0, 1, 2, 2, 4, 2,
	1, 0, 0, 5, 0, 2, 1, 1, 5, 2, 0, 1, 1, 4, 1, 0,
	2, 3, 2, 4, 1, 2, 0, 3, 3, 4, 1, 2, 3, 0, 0, 5,
	0, 1, 2, 3, 2, 5, 2, 1, 0, 3, 3, 5, 2, 1, 3, 0,
	0, 6, 0, 2, 1, 3, 1, 6, 2, 0, 1, 3, 3, 6, 2, 3,
	1, 0, 0, 7, 0, 2, 3, 1, 1, 7, 2, 0, 3, 1, 2, 7,
	2, 3, 0, 1, 0, 0, 1, 1, 2, 2, 1, 2, 1, 0, 0, 3,
	0, 1, 1, 4, 2, 0, 3, 4, 2, 1, 0, 5, 0, 2, 2, 5,
	1, 2, 2, 4, 6, 2, 1, 0, 1, 5, 6, 2, 0, 1, 2, 3,
	7, 1, 2, 0, 0, 5, 7, 0, 2, 1, 1, 3, 8, 1, 0, 2,
	0, 4, 8, 0, 1, 2, 2, 5, 8, 2, 1, 0, 3, 3, 5, 8,
	2, 1, 3, 0, 1, 6, 8, 2, 0, 1, 3, 3, 6, 8, 2, 3,
	1, 0, 1, 7, 8, 2, 0, 3, 1, 2, 7, 8, 2, 3, 0, 1,
	2, 4, 9, 1, 2, 0, 3, 3, 4, 9, 1, 2, 3, 0, 0, 6,
	9, 0, 2, 1, 3, 3, 6, 9, 3, 2, 1, 0, 0, 7, 9, 0,
	2, 3, 1, 2, 7, 9, 3, 2, 0, 1, 1, 4, 10, 1, 0, 2,
	3, 3, 4, 10, 1, 3, 2, 0, 0, 5, 10, 0, 1, 2, 3, 3,
	5, 10, 3, 1, 2, 0, 0, 7, 10, 0, 3, 2, 1, 1, 7, 10,
	3, 0, 2, 1, 1, 4, 11, 1, 0, 3, 2, 2, 4, 11, 1, 3,
	0, 2, 0, 5, 11, 0, 1, 3, 2, 2, 5, 11, 3, 1, 0, 2,
	0, 6, 11, 0, 3, 1, 2, 1, 6, 11, 3, 0, 1, 2, 0, 0,
	1, 1, 2, 2, 3, 3, 1, 2, 1, 0, 0, 3, 0, 1, 1, 4,
	2, 0, 3, 4, 2, 1, 0, 5, 0, 2, 2, 5, 1, 2, 1, 6,
	3, 0, 3, 6, 3, 1, 5, 6, 3, 2, 0, 7, 0, 3, 2, 7,
	1, 3, 4, 7, 2, 3, 2, 4, 6, 2, 1, 0, 1, 5, 6, 2,
	0, 1, 2, 3, 7, 1, 2, 0, 0, 5, 7, 0, 2, 1, 1, 3,
	8, 1, 0, 2, 0, 4, 8, 0, 1, 2, 2, 4, 9, 3, 1, 0,
	1, 5, 9, 3, 0, 1, 2, 7, 9, 3, 2, 0, 5, 7, 9, 3,
	2, 1, 1, 8, 9, 3, 0, 2, 4, 8, 9, 3, 1, 2, 2, 3,
	10, 1, 3, 0, 0, 5, 10, 0, 3, 1, 2, 6, 10, 2, 3, 0,
	5, 6, 10, 2, 3, 1, 0, 8, 10, 0, 3, 2, 3, 8, 10, 1,
	3, 2, 1, 3, 11, 1, 0, 3, 0, 4, 11, 0, 1, 3, 1, 6,
	11, 2, 0, 3, 4, 6, 11, 2, 1, 3, 0, 7, 11, 0, 2, 3,
	3, 7, 11, 1, 2, 3, 3, 6, 9, 12, 3, 2, 1, 0, 2, 7,
	9, 12, 3, 2, 0, 1, 3, 5, 10, 12, 3, 1, 2, 0, 1, 7,
	10, 12, 3, 0, 2, 1, 2, 5, 11, 12, 3, 1, 0, 2, 1, 6,
	11, 12, 3, 0, 1, 2, 3, 6, 8, 13, 2, 3, 1, 0, 2, 7,
	8, 13, 2, 3, 0, 1, 3, 4, 10, 13, 1, 3, 2, 0, 0, 7,
	10, 13, 0, 3, 2, 1, 2, 4, 11, 13, 1, 3, 0, 2, 0, 6,
	11, 13, 0, 3, 1, 2, 3, 5, 8, 14, 2, 1, 3, 0, 1, 7,
	8, 14, 2, 0, 3, 1, 3, 4, 9, 14, 1, 2, 3, 0, 0, 7,
	9, 14, 0, 2, 3, 1, 1, 4, 11, 14, 1, 0, 3, 2, 0, 5,
	11, 14, 0, 1, 3, 2, 2, 5, 8, 15, 2, 1, 0, 3, 1, 6,
	8, 15, 2, 0, 1, 3, 2, 4, 9, 15, 1, 2, 0, 3, 0, 6,
	9, 15, 0, 2, 1, 3, 1, 4, 10, 15, 1, 0, 2, 3, 0, 5,
	10, 15, 0, 1, 2, 3,
};

/* generated by mtdev-kernel - do not edit */
static const int match_index[][5] = {
	{ 0, 0, 1, 3, 6 },
	{ 10, 10, 12, 18, 30 },
	{ 50, 50, 54, 62, 92 },
	{ 164, 164, 170, 194, 230 },
	{ 398, 398, 406, 454, 598 },
	{ 790 }
};

static void set_dist(u32 *dist,
		     const struct trk_coord *b1, const struct trk_coord *e1,
		     const struct trk_coord *b2, const struct trk_coord *e2)
{
	const struct trk_coord *p, *q;

	for (p = b1; p != e1; p++)
		for (q = b2; q != e2; q++)
			*dist++ = abs(q->x - p->x) + abs(q->y - p->y);
}

const u8 *mtdev_match_four(const struct trk_coord *old, int nslot,
			   const struct trk_coord *pos, int npos)
{
	u32 d[16], obj, t;
	const u8 *p, *b, *e;
	const int *at;

	set_dist(d, old, old + nslot, pos, pos + npos);

	at = &match_index[nslot][npos];
	b = &match_data[at[0]];
	e = &match_data[at[1]];

	obj = UINT_MAX, p = b;

	switch (minval(nslot, npos)) {
	case 1:
		for (; b != e; b += npos) {
			t = d[*b++];
			if (t < obj)
				obj = t, p = b;
		}
		break;
	case 2:
		for (; b != e; b += npos) {
			t = d[*b++], t += d[*b++];
			if (t < obj)
				obj = t, p = b;
		}
		break;
	case 3:
		for (; b != e; b += npos) {
			t = d[*b++], t += d[*b++], t += d[*b++];
			if (t < obj)
				obj = t, p = b;
		}
		break;
	case 4:
		for (; b != e; b += npos) {
			t = d[*b++], t += d[*b++], t += d[*b++], t += d[*b++];
			if (t < obj)
				obj = t, p = b;
		}
		break;
	}

	return p;
}