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+/* Copyright (C) 2001-2019 Peter Selinger.
+ This file is part of Potrace. It is free software and it is covered
+ by the GNU General Public License. See the file COPYING for details. */
+
+#ifndef POTRACELIB_H
+#define POTRACELIB_H
+
+/* this file defines the API for the core Potrace library. For a more
+ detailed description of the API, see potracelib.pdf */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* ---------------------------------------------------------------------- */
+/* tracing parameters */
+
+/* turn policies */
+#define POTRACE_TURNPOLICY_BLACK 0
+#define POTRACE_TURNPOLICY_WHITE 1
+#define POTRACE_TURNPOLICY_LEFT 2
+#define POTRACE_TURNPOLICY_RIGHT 3
+#define POTRACE_TURNPOLICY_MINORITY 4
+#define POTRACE_TURNPOLICY_MAJORITY 5
+#define POTRACE_TURNPOLICY_RANDOM 6
+
+/* structure to hold progress bar callback data */
+struct potrace_progress_s {
+ void (*callback)(double progress, void *privdata); /* callback fn */
+ void *data; /* callback function's private data */
+ double min, max; /* desired range of progress, e.g. 0.0 to 1.0 */
+ double epsilon; /* granularity: can skip smaller increments */
+};
+typedef struct potrace_progress_s potrace_progress_t;
+
+/* structure to hold tracing parameters */
+struct potrace_param_s {
+ int turdsize; /* area of largest path to be ignored */
+ int turnpolicy; /* resolves ambiguous turns in path decomposition */
+ double alphamax; /* corner threshold */
+ int opticurve; /* use curve optimization? */
+ double opttolerance; /* curve optimization tolerance */
+ potrace_progress_t progress; /* progress callback function */
+};
+typedef struct potrace_param_s potrace_param_t;
+
+/* ---------------------------------------------------------------------- */
+/* bitmaps */
+
+/* native word size */
+typedef unsigned long potrace_word;
+
+/* Internal bitmap format. The n-th scanline starts at scanline(n) =
+ (map + n*dy). Raster data is stored as a sequence of potrace_words
+ (NOT bytes). The leftmost bit of scanline n is the most significant
+ bit of scanline(n)[0]. */
+struct potrace_bitmap_s {
+ int w, h; /* width and height, in pixels */
+ int dy; /* words per scanline (not bytes) */
+ potrace_word *map; /* raw data, dy*h words */
+};
+typedef struct potrace_bitmap_s potrace_bitmap_t;
+
+/* ---------------------------------------------------------------------- */
+/* curves */
+
+/* point */
+struct potrace_dpoint_s {
+ double x, y;
+};
+typedef struct potrace_dpoint_s potrace_dpoint_t;
+
+/* segment tags */
+#define POTRACE_CURVETO 1
+#define POTRACE_CORNER 2
+
+/* closed curve segment */
+struct potrace_curve_s {
+ int n; /* number of segments */
+ int *tag; /* tag[n]: POTRACE_CURVETO or POTRACE_CORNER */
+ potrace_dpoint_t (*c)[3]; /* c[n][3]: control points.
+ c[n][0] is unused for tag[n]=POTRACE_CORNER */
+};
+typedef struct potrace_curve_s potrace_curve_t;
+
+/* Linked list of signed curve segments. Also carries a tree structure. */
+struct potrace_path_s {
+ int area; /* area of the bitmap path */
+ int sign; /* '+' or '-', depending on orientation */
+ potrace_curve_t curve; /* this path's vector data */
+
+ struct potrace_path_s *next; /* linked list structure */
+
+ struct potrace_path_s *childlist; /* tree structure */
+ struct potrace_path_s *sibling; /* tree structure */
+
+ struct potrace_privpath_s *priv; /* private state */
+};
+typedef struct potrace_path_s potrace_path_t;
+
+/* ---------------------------------------------------------------------- */
+/* Potrace state */
+
+#define POTRACE_STATUS_OK 0
+#define POTRACE_STATUS_INCOMPLETE 1
+
+struct potrace_state_s {
+ int status;
+ potrace_path_t *plist; /* vector data */
+
+ struct potrace_privstate_s *priv; /* private state */
+};
+typedef struct potrace_state_s potrace_state_t;
+
+/* ---------------------------------------------------------------------- */
+/* API functions */
+
+/* get default parameters */
+potrace_param_t *potrace_param_default(void);
+
+/* free parameter set */
+void potrace_param_free(potrace_param_t *p);
+
+/* trace a bitmap */
+potrace_state_t *potrace_trace(const potrace_param_t *param,
+ const potrace_bitmap_t *bm);
+
+/* free a Potrace state */
+void potrace_state_free(potrace_state_t *st);
+
+/* return a static plain text version string identifying this version
+ of potracelib */
+const char *potrace_version(void);
+
+#ifdef __cplusplus
+} /* end of extern "C" */
+#endif
+
+#endif /* POTRACELIB_H */