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/* Copyright (C) 2001-2007 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. */
/* $Id: curve.c 147 2007-04-09 00:44:09Z selinger $ */
/* 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* 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 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 ) {
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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