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/* This file written by George Williams to provide a gateway to fontforge */
/* it it a modification of Raph's bezctx_ps.c */
#include <basics.h>
#include <stdio.h>
#ifndef _NO_LIBSPIRO
#include "bezctx_ff.h"
#include "fontforgevw.h" /* For LogError, else splinefont.h */
#ifdef HAVE_IEEEFP_H
# include <ieeefp.h> /* Solaris defines isnan in ieeefp rather than math.h */
#else
# include <math.h>
#endif
typedef struct {
bezctx base;
int is_open;
int gotnans;
SplineSet *ss;
} bezctx_ff;
static void
nancheck(bezctx_ff *bc) {
if ( !bc->gotnans ) {
LogError("Spiros did not converge" );
bc->gotnans = true;
}
}
static void
bezctx_ff_moveto(bezctx *z, double x, double y, int is_open) {
bezctx_ff *bc = (bezctx_ff *)z;
if ( !finite(x) || !finite(y)) {
nancheck(bc);
x = y = 0;
}
if (!bc->is_open) {
SplineSet *ss = chunkalloc(sizeof(SplineSet));
ss->next = bc->ss;
bc->ss = ss;
}
bc->ss->first = bc->ss->last = SplinePointCreate(x,y);
bc->is_open = is_open;
}
static void
bezctx_ff_lineto(bezctx *z, double x, double y) {
bezctx_ff *bc = (bezctx_ff *)z;
SplinePoint *sp;
if ( !finite(x) || !finite(y)) {
nancheck(bc);
x = y = 0;
}
sp = SplinePointCreate(x,y);
SplineMake3(bc->ss->last,sp);
bc->ss->last = sp;
}
static void
bezctx_ff_quadto(bezctx *z, double xm, double ym, double x3, double y3)
{
bezctx_ff *bc = (bezctx_ff *)z;
double x0, y0;
double x1, y1;
double x2, y2;
SplinePoint *sp;
if ( !finite(xm) || !finite(ym) || !finite(x3) || !finite(y3)) {
nancheck(bc);
xm = ym = x3 = y3 = 0;
}
sp = SplinePointCreate(x3,y3);
x0 = bc->ss->last->me.x;
y0 = bc->ss->last->me.y;
x1 = xm + (1./3) * (x0 - xm);
y1 = ym + (1./3) * (y0 - ym);
x2 = xm + (1./3) * (x3 - xm);
y2 = ym + (1./3) * (y3 - ym);
bc->ss->last->nextcp.x = x1;
bc->ss->last->nextcp.y = y1;
bc->ss->last->nonextcp = false;
sp->prevcp.x = x2;
sp->prevcp.y = y2;
sp->noprevcp = false;
SplineMake3(bc->ss->last,sp);
bc->ss->last = sp;
}
static void
bezctx_ff_curveto(bezctx *z, double x1, double y1, double x2, double y2,
double x3, double y3)
{
bezctx_ff *bc = (bezctx_ff *)z;
SplinePoint *sp;
if ( !finite(x1) || !finite(y1) || !finite(x2) || !finite(y2) || !finite(x3) || !finite(y3)) {
nancheck(bc);
x1 = y1 = x2 = y2 = x3 = y3 = 0;
}
sp = SplinePointCreate(x3,y3);
bc->ss->last->nextcp.x = x1;
bc->ss->last->nextcp.y = y1;
bc->ss->last->nonextcp = false;
sp->prevcp.x = x2;
sp->prevcp.y = y2;
sp->noprevcp = false;
SplineMake3(bc->ss->last,sp);
bc->ss->last = sp;
}
bezctx *
new_bezctx_ff(void) {
bezctx_ff *result = chunkalloc(sizeof(bezctx_ff));
result->base.moveto = bezctx_ff_moveto;
result->base.lineto = bezctx_ff_lineto;
result->base.quadto = bezctx_ff_quadto;
result->base.curveto = bezctx_ff_curveto;
result->base.mark_knot = NULL;
result->is_open = 0;
result->gotnans = 0;
result->ss = NULL;
return &result->base;
}
struct splinepointlist *
bezctx_ff_close(bezctx *z)
{
bezctx_ff *bc = (bezctx_ff *)z;
SplineSet *ss = bc->ss;
if (!bc->is_open && ss!=NULL ) {
if ( ss->first!=ss->last &&
RealNear(ss->first->me.x,ss->last->me.x) &&
RealNear(ss->first->me.y,ss->last->me.y)) {
ss->first->prevcp = ss->last->prevcp;
ss->first->noprevcp = ss->last->noprevcp;
ss->first->prev = ss->last->prev;
ss->first->prev->to = ss->first;
SplinePointFree(ss->last);
ss->last = ss->first;
} else {
SplineMake3(ss->last,ss->first);
ss->last = ss->first;
}
}
chunkfree(bc,sizeof(bezctx_ff));
return( ss );
}
#endif
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