gsk/gsksplineprivate.h


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/*
 * Copyright © 2020 Benjamin Otte
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Benjamin Otte <otte@gnome.org>
 */


#ifndef __GSK_SPLINE_PRIVATE_H__
#define __GSK_SPLINE_PRIVATE_H__

#include "gskpath.h"

G_BEGIN_DECLS

typedef void (* GskSplineAddPointFunc) (const graphene_point_t *from,
                                        const graphene_point_t *to,
                                        float                   from_progress,
                                        float                   to_progress,
                                        gpointer                user_data);

void                    gsk_spline_get_point_cubic              (const graphene_point_t  pts[4],
                                                                 float                   progress,
                                                                 graphene_point_t       *pos,
                                                                 graphene_vec2_t        *tangent);
void                    gsk_spline_split_cubic                  (const graphene_point_t  pts[4],
                                                                 graphene_point_t        result1[4],
                                                                 graphene_point_t        result2[4],
                                                                 float                   progress);
void                    gsk_spline_decompose_cubic              (const graphene_point_t  pts[4],
                                                                 float                   tolerance,
                                                                 GskSplineAddPointFunc   add_point_func,
                                                                 gpointer                user_data);

void                    gsk_spline_get_point_conic              (const graphene_point_t  pts[4],
                                                                 float                   progress,
                                                                 graphene_point_t       *pos,
                                                                 graphene_vec2_t        *tangent);
void                    gsk_spline_split_conic                  (const graphene_point_t  pts[4],
                                                                 graphene_point_t        result1[4],
                                                                 graphene_point_t        result2[4],
                                                                 float                   progress);
void                    gsk_spline_decompose_conic              (const graphene_point_t  pts[4],
                                                                 float                   tolerance,
                                                                 GskSplineAddPointFunc   add_point_func,
                                                                 gpointer                user_data);

typedef gboolean (* GskSplineAddCurveFunc) (const graphene_point_t curve[4],
                                            gpointer               user_data);
gboolean                gsk_spline_decompose_arc                (const graphene_point_t *center,
                                                                 float                   radius,
                                                                 float                   tolerance,
                                                                 float                   start_angle,
                                                                 float                   end_angle,
                                                                 GskSplineAddCurveFunc   curve_func,
                                                                 gpointer                user_data);

G_END_DECLS

#endif /* __GSK_SPLINE_PRIVATE_H__ */