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#ifndef __wind_h__
#define __wind_h__
/* Every segment has an original direction, which is the direction
the segment had in the input data.
as our scanline moves from minimum y to maximum y, "DOWN" means
the the (original) segment's y2 is larger than its y1 */
typedef enum {DIR_UP, DIR_DOWN, DIR_UNKNOWN} segment_dir_t;
#define DIR_INVERT(d) ((d)^(DIR_UP^DIR_DOWN))
typedef struct _edgestyle {
void*internal;
} edgestyle_t;
extern edgestyle_t edgestyle_default;
typedef struct _windstate
{
char is_filled;
int wind_nr;
} windstate_t;
typedef struct _windcontext
{
int num_polygons;
} windcontext_t;
typedef struct _windrule
{
windstate_t (*start)(windcontext_t* num_polygons);
windstate_t (*add)(windcontext_t*context, windstate_t left, edgestyle_t*edge, segment_dir_t dir, int polygon_nr);
edgestyle_t* (*diff)(windstate_t*left, windstate_t*right);
} windrule_t;
extern windrule_t windrule_evenodd;
extern windrule_t windrule_circular;
extern windrule_t windrule_intersect;
extern windrule_t windrule_union;
#endif
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