/usr/include/gwyddion/libprocess/spline.h is in libgwyddion20-dev 2.50-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id: spline.h 20678 2017-12-18 18:26:55Z yeti-dn $
* Copyright (C) 2016-2017 David Necas (Yeti).
* E-mail: yeti@gwyddion.net.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GWY_SPLINE_H__
#define __GWY_SPLINE_H__
#include <glib.h>
#include <libgwyddion/gwymath.h>
G_BEGIN_DECLS
typedef struct _GwySpline GwySpline;
#define GWY_TYPE_SPLINE (gwy_spline_get_type())
GType gwy_spline_get_type (void) G_GNUC_CONST;
GwySpline* gwy_spline_new (void) G_GNUC_MALLOC;
void gwy_spline_free (GwySpline *spline);
GwySpline* gwy_spline_copy (GwySpline *spline) G_GNUC_MALLOC;
GwySpline* gwy_spline_new_from_points (const GwyXY *xy,
guint n);
guint gwy_spline_get_npoints (GwySpline *spline);
const GwyXY* gwy_spline_get_points (GwySpline *spline);
const GwyXY* gwy_spline_get_tangents (GwySpline *spline);
gdouble gwy_spline_get_slackness (GwySpline *spline);
gboolean gwy_spline_get_closed (GwySpline *spline);
void gwy_spline_set_points (GwySpline *spline,
const GwyXY *xy,
guint n);
void gwy_spline_set_slackness (GwySpline *spline,
gdouble slackness);
void gwy_spline_set_closed (GwySpline *spline,
gboolean closed);
gdouble gwy_spline_length (GwySpline *spline);
const GwyXY* gwy_spline_sample_naturally(GwySpline *spline,
guint *n);
gdouble gwy_spline_sample_uniformly(GwySpline *spline,
GwyXY *xy,
GwyXY *t,
guint n);
G_END_DECLS
#endif /* __GWY_SPLINE_H__ */
/* vim: set cin et ts=4 sw=4 cino=>1s,e0,n0,f0,{0,}0,^0,\:1s,=0,g1s,h0,t0,+1s,c3,(0,u0 : */
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