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-/* Libart_LGPL - library of basic graphic primitives
- * Copyright (C) 1998-2000 Raph Levien
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-/* Vector path set operations, over sorted vpaths. */
-
-#include "config.h"
-#include "art_svp_ops.h"
-
-#include "art_misc.h"
-
-#include "art_svp.h"
-#include "art_vpath.h"
-#include "art_svp_vpath.h"
-#include "art_svp.h"
-#ifdef ART_USE_NEW_INTERSECTOR
-#include "art_svp_intersect.h"
-#else
-#include "art_svp_wind.h"
-#endif
-#include "art_vpath_svp.h"
-
-/* Merge the segments of the two svp's. The resulting svp will share
- segments with args passed in, so be super-careful with the
- allocation. */
-/**
- * art_svp_merge: Merge the segments of two svp's.
- * @svp1: One svp to merge.
- * @svp2: The other svp to merge.
- *
- * Merges the segments of two SVP's into a new one. The resulting
- * #ArtSVP data structure will share the segments of the argument
- * svp's, so it is probably a good idea to free it shallowly,
- * especially if the arguments will be freed with art_svp_free().
- *
- * Return value: The merged #ArtSVP.
- **/
-static ArtSVP *
-art_svp_merge (const ArtSVP *svp1, const ArtSVP *svp2)
-{
- ArtSVP *svp_new;
- gint ix;
- gint ix1, ix2;
-
- svp_new = (ArtSVP *)art_alloc (sizeof (ArtSVP) +
- (svp1->n_segs + svp2->n_segs - 1) *
- sizeof (ArtSVPSeg));
- ix1 = 0;
- ix2 = 0;
- for (ix = 0; ix < svp1->n_segs + svp2->n_segs; ix++)
- {
- if (ix1 < svp1->n_segs &&
- (ix2 == svp2->n_segs ||
- art_svp_seg_compare (&svp1->segs[ix1], &svp2->segs[ix2]) < 1))
- svp_new->segs[ix] = svp1->segs[ix1++];
- else
- svp_new->segs[ix] = svp2->segs[ix2++];
- }
-
- svp_new->n_segs = ix;
- return svp_new;
-}
-
-#ifndef ART_USE_NEW_INTERSECTOR
-static ArtSVP *
-art_svp_merge_perturbed (const ArtSVP *svp1, const ArtSVP *svp2)
-{
- ArtVpath *vpath1, *vpath2;
- ArtVpath *vpath1_p, *vpath2_p;
- ArtSVP *svp1_p, *svp2_p;
- ArtSVP *svp_new;
-
- vpath1 = art_vpath_from_svp (svp1);
- vpath1_p = art_vpath_perturb (vpath1);
- art_free (vpath1);
- svp1_p = art_svp_from_vpath (vpath1_p);
- art_free (vpath1_p);
-
- vpath2 = art_vpath_from_svp (svp2);
- vpath2_p = art_vpath_perturb (vpath2);
- art_free (vpath2);
- svp2_p = art_svp_from_vpath (vpath2_p);
- art_free (vpath2_p);
-
- svp_new = art_svp_merge (svp1_p, svp2_p);
- art_free (svp1_p);
- art_free (svp2_p);
-
- return svp_new;
-}
-#endif
-
-/* Compute the intersection of two vector paths.
-
- Status of this routine:
-
- Basic correctness: Seems to work.
-
- Numerical stability: We cheat (adding random perturbation). Thus,
- it seems very likely that no numerical stability problems will be
- seen in practice.
-
- Speed: Would be better if we didn't go to unsorted vector path
- and back to add the perturbation.
-
- Precision: The perturbation fuzzes the coordinates slightly. In
- cases of butting segments, razor thin long isolated segments may
- appear.
-
-*/
-
-/**
- * art_svp_intersect: Compute the intersection of two sorted vector paths.
- * @svp1: One sorted vector path.
- * @svp2: The other sorted vector path.
- *
- * Computes the intersection of the two argument svp's. Given two
- * svp's with winding numbers of 0 and 1 everywhere, the resulting
- * winding number will be 1 where both of the argument svp's has a
- * winding number 1, 0 otherwise. The result is newly allocated.
- *
- * Currently, this routine has accuracy problems pending the
- * implementation of the new intersector.
- *
- * Return value: The intersection of @svp1 and @svp2.
- **/
-ArtSVP *
-art_svp_intersect (const ArtSVP *svp1, const ArtSVP *svp2)
-{
-#ifdef ART_USE_NEW_INTERSECTOR
- ArtSVP *svp3, *svp_new;
- ArtSvpWriter *swr;
-
- svp3 = art_svp_merge (svp1, svp2);
- swr = art_svp_writer_rewind_new (ART_WIND_RULE_INTERSECT);
- art_svp_intersector (svp3, swr);
- svp_new = art_svp_writer_rewind_reap (swr);
- art_free (svp3); /* shallow free because svp3 contains shared segments */
-
- return svp_new;
-#else
- ArtSVP *svp3, *svp4, *svp_new;
-
- svp3 = art_svp_merge_perturbed (svp1, svp2);
- svp4 = art_svp_uncross (svp3);
- art_svp_free (svp3);
-
- svp_new = art_svp_rewind_uncrossed (svp4, ART_WIND_RULE_INTERSECT);
- art_svp_free (svp4);
- return svp_new;
-#endif
-}
-