149 lines
7.2 KiB
C
149 lines
7.2 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#ifndef __GSK_CURVE_PRIVATE_H__
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#define __GSK_CURVE_PRIVATE_H__
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#include "gskpathopprivate.h"
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#include "gskboundingboxprivate.h"
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G_BEGIN_DECLS
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typedef gpointer gskpathop;
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typedef union _GskCurve GskCurve;
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typedef struct _GskLineCurve GskLineCurve;
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typedef struct _GskCurveCurve GskCurveCurve;
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typedef struct _GskConicCurve GskConicCurve;
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struct _GskLineCurve
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{
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GskPathOperation op;
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gboolean padding;
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graphene_point_t points[2];
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};
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struct _GskCurveCurve
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{
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GskPathOperation op;
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gboolean has_coefficients;
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graphene_point_t points[4];
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graphene_point_t coeffs[4];
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};
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struct _GskConicCurve
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{
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GskPathOperation op;
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gboolean has_coefficients;
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/* points[0], points[1], points[3] are the control points,
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* points[2].x is the weight
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*/
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graphene_point_t points[4];
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graphene_point_t num[3];
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graphene_point_t denom[3];
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};
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union _GskCurve
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{
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GskPathOperation op;
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GskLineCurve line;
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GskCurveCurve curve;
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GskConicCurve conic;
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};
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typedef gboolean (* GskCurveAddLineFunc) (const graphene_point_t *from,
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const graphene_point_t *to,
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float from_progress,
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float to_progress,
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gpointer user_data);
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typedef gboolean (* GskCurveAddCurveFunc) (const graphene_point_t points[4],
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gpointer user_data);
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void gsk_curve_init (GskCurve *curve,
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gskpathop op);
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void gsk_curve_init_foreach (GskCurve *curve,
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GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts,
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float weight);
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void gsk_curve_get_point (const GskCurve *curve,
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float progress,
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graphene_point_t *pos);
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void gsk_curve_get_tangent (const GskCurve *curve,
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float progress,
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graphene_vec2_t *tangent);
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void gsk_curve_split (const GskCurve *curve,
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float progress,
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GskCurve *start,
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GskCurve *end);
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void gsk_curve_segment (const GskCurve *curve,
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float start,
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float end,
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GskCurve *segment);
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gboolean gsk_curve_decompose (const GskCurve *curve,
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float tolerance,
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GskCurveAddLineFunc add_line_func,
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gpointer user_data);
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gboolean gsk_curve_decompose_curve (const GskCurve *curve,
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float tolerance,
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GskCurveAddCurveFunc add_curve_func,
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gpointer user_data);
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gskpathop gsk_curve_pathop (const GskCurve *curve);
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#define gsk_curve_builder_to(curve, builder) gsk_path_builder_pathop_to ((builder), gsk_curve_pathop (curve))
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const graphene_point_t *gsk_curve_get_start_point (const GskCurve *curve);
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const graphene_point_t *gsk_curve_get_end_point (const GskCurve *curve);
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void gsk_curve_get_start_tangent (const GskCurve *curve,
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graphene_vec2_t *tangent);
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void gsk_curve_get_end_tangent (const GskCurve *curve,
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graphene_vec2_t *tangent);
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void gsk_curve_get_bounds (const GskCurve *curve,
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GskBoundingBox *bounds);
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void gsk_curve_get_tight_bounds (const GskCurve *curve,
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GskBoundingBox *bounds);
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int gsk_curve_intersect (const GskCurve *curve1,
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const GskCurve *curve2,
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float *t1,
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float *t2,
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graphene_point_t *p,
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int n);
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void gsk_curve_offset (const GskCurve *curve,
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float distance,
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GskCurve *offset_curve);
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void gsk_curve_reverse (const GskCurve *curve,
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GskCurve *reverse);
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G_END_DECLS
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#endif /* __GSK_CURVE_PRIVATE_H__ */
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