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/* Copyright (C) 2001-2011 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. */
/* private part of the path and curve data structures */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "potracelib.h"
#include "lists.h"
#include "curve.h"
#define SAFE_MALLOC(var, n, typ) \
if ((var = (typ *)malloc((n)*sizeof(typ))) == NULL) goto malloc_error
/* ---------------------------------------------------------------------- */
/* allocate and free path objects */
path_t *potrace_path_new(void) {
path_t *p = NULL;
privpath_t *priv = NULL;
SAFE_MALLOC(p, 1, path_t);
memset(p, 0, sizeof(path_t));
SAFE_MALLOC(priv, 1, privpath_t);
memset(priv, 0, sizeof(privpath_t));
p->priv = priv;
return p;
malloc_error:
free(p);
free(priv);
return NULL;
}
/* free the members of the given curve structure. Leave errno unchanged. */
static void privcurve_free_members(privcurve_t *curve) {
free(curve->tag);
free(curve->c);
free(curve->vertex);
free(curve->alpha);
free(curve->alpha0);
free(curve->beta);
}
/* free a path. Leave errno untouched. */
void potrace_path_free(path_t *p) {
if (p) {
if (p->priv) {
free(p->priv->pt);
free(p->priv->lon);
free(p->priv->sums);
free(p->priv->po);
privcurve_free_members(&p->priv->curve);
privcurve_free_members(&p->priv->ocurve);
}
free(p->priv);
/* do not free p->fcurve ! */
}
free(p);
}
/* free a pathlist, leaving errno untouched. */
void pathlist_free(path_t *plist) {
path_t *p;
list_forall_unlink(p, plist) {
potrace_path_free(p);
}
}
/* ---------------------------------------------------------------------- */
/* initialize and finalize curve structures */
typedef dpoint_t dpoint3_t[3];
/* initialize the members of the given curve structure to size m.
Return 0 on success, 1 on error with errno set. */
int privcurve_init(privcurve_t *curve, int n) {
memset(curve, 0, sizeof(privcurve_t));
curve->n = n;
SAFE_MALLOC(curve->tag, n, int);
SAFE_MALLOC(curve->c, n, dpoint3_t);
SAFE_MALLOC(curve->vertex, n, dpoint_t);
SAFE_MALLOC(curve->alpha, n, double);
SAFE_MALLOC(curve->alpha0, n, double);
SAFE_MALLOC(curve->beta, n, double);
return 0;
malloc_error:
free(curve->tag);
free(curve->c);
free(curve->vertex);
free(curve->alpha);
free(curve->alpha0);
free(curve->beta);
return 1;
}
/* copy private to public curve structure */
void privcurve_to_curve(privcurve_t *pc, potrace_curve_t *c) {
c->n = pc->n;
c->tag = pc->tag;
c->c = pc->c;
}
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