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/* Copyright (C) 2007-2012 by George Williams */
/* 2013sep19-22, error handling and cleanup fixes in Spiro.c, Jose Da Silva */
/*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "fontforgevw.h"
/* Access to Raph Levien's spiro splines */
/* See http://www.levien.com/spiro/ */
#ifdef _NO_LIBSPIRO
static int has_spiro = false;
SplineSet *SpiroCP2SplineSet(spiro_cp *spiros) {
return( NULL );
}
spiro_cp *SplineSet2SpiroCP(SplineSet *ss,uint16 *cnt) {
return( NULL );
}
#else /* ! _NO_LIBSPIRO */
# include "bezctx_ff.h"
static int has_spiro = true;
SplineSet *SpiroCP2SplineSet(spiro_cp *spiros) {
/* Create a SplineSet from the given spiros_code_points.*/
int n;
int any = 0;
SplineSet *ss;
int lastty = 0;
if ( spiros==NULL )
return( NULL );
for ( n=0; spiros[n].ty!=SPIRO_END; ++n )
if ( SPIRO_SELECTED(&spiros[n]) )
++any;
if ( n==0 )
return( NULL );
if ( n==1 ) {
/* Spiro only haS 1 code point sofar (no conversion needed yet) */
if ( (ss=chunkalloc(sizeof(SplineSet)))==NULL || \
(ss->first=ss->last=SplinePointCreate(spiros[0].x,spiros[0].y))==NULL ||
(ss->start_offset = 0) != 0) {
chunkfree(ss,sizeof(SplineSet));
return( NULL );
}
} else {
/* Spiro needs to be converted to bezier curves using libspiro. */
bezctx *bc;
if ( (bc=new_bezctx_ff())==NULL )
return( NULL );
if ( (spiros[0].ty&0x7f)=='{' ) {
lastty = spiros[n-1].ty;
spiros[n-1].ty = '}';
}
if ( !any ) {
#if _LIBSPIRO_FUN
if ( TaggedSpiroCPsToBezier0(spiros,bc)==0 ) {
if ( lastty ) spiros[n-1].ty = lastty;
free(bc);
return( NULL );
}
#else
TaggedSpiroCPsToBezier(spiros,bc);
#endif
} else {
int i;
spiro_cp *nspiros;
if ( (nspiros=malloc((n+1)*sizeof(spiro_cp)))==NULL ) {
if ( lastty ) spiros[n-1].ty = lastty;
free(bc);
return( NULL );
}
memcpy(nspiros,spiros,(n+1)*sizeof(spiro_cp));
for ( i=0; nspiros[i].ty!=SPIRO_END; ++i )
nspiros[i].ty &= ~0x80;
#if _LIBSPIRO_FUN
if ( TaggedSpiroCPsToBezier0(nspiros,bc)==0 ) {
if ( lastty ) spiros[n-1].ty = lastty;
free(nspiros);
free(bc);
return( NULL );
}
#else
TaggedSpiroCPsToBezier(nspiros,bc);
#endif
free(nspiros);
}
if ( lastty ) spiros[n-1].ty = lastty;
if ( (ss=bezctx_ff_close(bc))==NULL ) return( NULL );
}
ss->spiros = spiros;
ss->spiro_cnt = ss->spiro_max = n+1;
SPLCategorizePoints(ss);
return( ss );
}
spiro_cp *SplineSet2SpiroCP(SplineSet *ss,uint16 *_cnt) {
/* I don't know a good way to do this. I hope including a couple of */
/* mid-points on every spline will do a reasonable job */
SplinePoint *sp;
Spline *s;
int cnt;
spiro_cp *ret;
for ( cnt=0, sp=ss->first; ; ) {
++cnt;
if ( sp->next==NULL )
break;
sp = sp->next->to;
if ( sp == ss->first )
break;
}
ret = malloc((3*cnt+1)*sizeof(spiro_cp));
for ( cnt=0, sp=ss->first; ; ) {
ret[cnt].x = sp->me.x;
ret[cnt].y = sp->me.y;
ret[cnt].ty = sp->pointtype == pt_corner ? SPIRO_CORNER :
sp->pointtype == pt_tangent ? SPIRO_LEFT :
SPIRO_G4;
if ( sp->pointtype == pt_tangent && sp->prev!=NULL && sp->next!=NULL ) {
if ( (sp->next->knownlinear && sp->prev->knownlinear) ||
(!sp->next->knownlinear && !sp->prev->knownlinear ))
ret[cnt].ty = SPIRO_CORNER;
else if ( sp->prev->knownlinear && !sp->nonextcp )
ret[cnt].ty = SPIRO_RIGHT;
else if ( sp->next->knownlinear && !sp->noprevcp )
ret[cnt].ty = SPIRO_LEFT;
} else if ( sp->pointtype==pt_curve && sp->prev!=NULL && sp->prev->knownlinear &&
!sp->nonextcp && sp->prev->from->pointtype == pt_corner )
ret[cnt].ty = SPIRO_LEFT;
else if ( sp->pointtype==pt_curve && sp->next!=NULL && sp->next->knownlinear &&
!sp->noprevcp && sp->next->to->pointtype == pt_corner )
ret[cnt].ty = SPIRO_RIGHT;
++cnt;
if ( sp->next==NULL )
break;
s = sp->next;
if ( s->isquadratic ) {
ret[cnt].x = s->splines[0].d + .5*(s->splines[0].c+.5*(s->splines[0].b + .5*s->splines[0].a));
ret[cnt].y = s->splines[1].d + .5*(s->splines[1].c+.5*(s->splines[1].b + .5*s->splines[1].a));
ret[cnt++].ty = SPIRO_G4;
} else if ( !s->knownlinear ) {
ret[cnt].x = s->splines[0].d + .333*(s->splines[0].c+.333*(s->splines[0].b + .333*s->splines[0].a));
ret[cnt].y = s->splines[1].d + .333*(s->splines[1].c+.333*(s->splines[1].b + .333*s->splines[1].a));
ret[cnt++].ty = SPIRO_G4;
ret[cnt].x = s->splines[0].d + .667*(s->splines[0].c+.667*(s->splines[0].b + .667*s->splines[0].a));
ret[cnt].y = s->splines[1].d + .667*(s->splines[1].c+.667*(s->splines[1].b + .667*s->splines[1].a));
ret[cnt++].ty = SPIRO_G4;
}
sp = sp->next->to;
if ( sp == ss->first )
break;
}
ret[cnt].x = ret[cnt].y = 0;
ret[cnt++].ty = SPIRO_END;
if ( ss->first->prev==NULL )
ret[0].ty = SPIRO_OPEN_CONTOUR;
if ( _cnt!=NULL ) *_cnt = cnt;
return( ret );
}
#endif /* ! _NO_LIBSPIRO */
int hasspiro(void) {
return has_spiro;
}
spiro_cp *SpiroCPCopy(spiro_cp *spiros,uint16 *_cnt) {
/* Make a copy of a (closed='z' or open='{}') spiro */
int ch, n = 0;
spiro_cp *nspiros;
if ( spiros==NULL )
return( NULL );
while ( (ch=spiros[n++].ty)!='z' && ch!='}' );
if ( (nspiros=(spiro_cp*)malloc(n*sizeof(spiro_cp)))==NULL )
return( NULL );
memcpy(nspiros,spiros,n*sizeof(spiro_cp));
if ( _cnt != NULL ) *_cnt = n;
return( nspiros );
}
void SSRegenerateFromSpiros(SplineSet *spl) {
/* Regenerate an updated SplineSet from SpiroCPs after edits are done. */
if ( spl->spiro_cnt<=1 || !has_spiro )
return;
SplineSet *temp = SpiroCP2SplineSet(spl->spiros);
if ( temp!=NULL ) {
/* Regenerated new SplineSet. Discard old copy. Keep new copy. */
SplineSetBeziersClear(spl);
spl->first = temp->first;
spl->start_offset = 0;
spl->last = temp->last;
chunkfree(temp,sizeof(SplineSet));
} else {
/* Didn't converge... or something ...therefore let's fake-it. */
int i;
SplinePoint *sp, *first, *last;
if ( (last=first=SplinePointCreate(spl->spiros[0].x,spl->spiros[0].y))==NULL )
return;
for ( i=1; i<spl->spiro_cnt; ++i ) {
if ( (sp=SplinePointCreate(spl->spiros[i].x,spl->spiros[i].y)) ) {
SplineMake3(last,sp);
last = sp;
} else
break; /* ...have problem, but keep what we got so far */
}
/* dump the prior SplineSet and now show this line-art instead */
SplineSetBeziersClear(spl);
spl->first = first;
spl->start_offset = 0;
if ( SPIRO_SPL_OPEN(spl))
spl->last = last;
else {
SplineMake3(last,spl->first);
spl->last = spl->first;
}
}
spl->beziers_need_optimizer = true;
}
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