#ifndef PATTERN_H
#define PATTERN_H

typedef struct { int dx, dy; } cell_offset_t;

typedef struct {
    const char *name;
    int count;
    const cell_offset_t *cells;
} pattern_t;

int pattern_count(void);
const pattern_t *pattern_get(int index);

/* Fill out_dx/out_dy with normalized rotated offsets. Returns cell count. */
int pattern_rotated_offsets(int index, int rotation, int *out_dx, int *out_dy);

/* Bounding box of rotated pattern. */
void pattern_bounds(int index, int rotation, int *w, int *h);

#endif