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/* pxl-outline.h: find a list of outlines which make up one character. */
#ifndef PXL_OUTLINE_H
#define PXL_OUTLINE_H
#include "ppm.h"
#include "autotrace.h"
#include "exception.h"
#include "bitmap.h"
/* This is a list of contiguous points on the bitmap. */
typedef struct
{
pm_pixelcoord * data;
unsigned length;
bool clockwise;
pixel color;
bool open;
} pixel_outline_type;
/* The Nth coordinate in the list. */
#define O_COORDINATE(p_o, n) ((p_o).data[n])
/* The length of the list. */
#define O_LENGTH(p_o) ((p_o).length)
/* Whether the outline moves clockwise or counterclockwise. */
#define O_CLOCKWISE(p_o) ((p_o).clockwise)
/* Since a pixel outline is cyclic, the index of the next coordinate
after the last is the first, and the previous coordinate before the
first is the last. */
#define O_NEXT(p_o, n) (((n) + 1) % O_LENGTH (p_o))
#define O_PREV(p_o, n) ((n) == 0 \
? O_LENGTH (p_o) - 1 \
: (n) - 1)
/* And the character turns into a list of such lists. */
typedef struct
{
pixel_outline_type *data;
unsigned length;
} pixel_outline_list_type;
/* The Nth list in the list of lists. */
#define O_LIST_OUTLINE(p_o_l, n) ((p_o_l).data[n])
/* The length of the list of lists. */
#define O_LIST_LENGTH(p_o_l) ((p_o_l).length)
/* Find all pixels on the outline in the character C. */
pixel_outline_list_type
find_outline_pixels (bitmap_type const type,
bool const bg_spec,
pixel const bg_color,
at_progress_func notify_progress,
void * const progress_data,
at_testcancel_func test_cancel,
void * const testcancel_data,
at_exception_type * const exp);
/* Find all pixels on the center line of the character C. */
pixel_outline_list_type
find_centerline_pixels (bitmap_type const type,
pixel const bg_color,
at_progress_func notify_progress,
void * const progress_data,
at_testcancel_func test_cancel,
void * const testcancel_data,
at_exception_type * const exp);
/* Free the memory in the list. */
extern void
free_pixel_outline_list (pixel_outline_list_type *);
#endif /* not PXL_OUTLINE_H */
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