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1b5dfcba7e
This commit adds the basic infrastructure for paths. The public APIs consists of GskPath, GskPathPoint and GskPathBuilder. GskPath is a data structure for paths that consists of contours, which in turn might contain Bézier curves. The Bezier data structure is inspired by Skia, with separate arrays for points and operations. One advantage of this arrangement is that start and end points are shared between adjacent curves. A GskPathPoint represents a point on a path, which can be queried for various properties. GskPathBuilder is an auxiliary builder object for paths.
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
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* Copyright © 2023 Red Hat, Inc.
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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: Matthias Clasen <mclasen@redhat.com>
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*/
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#pragma once
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#if !defined (__GSK_H_INSIDE__) && !defined (GTK_COMPILATION)
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#error "Only <gsk/gsk.h> can be included directly."
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#endif
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#include <gsk/gsktypes.h>
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G_BEGIN_DECLS
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#define GSK_TYPE_PATH_POINT (gsk_path_point_get_type ())
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typedef struct _GskPathPoint GskPathPoint;
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struct _GskPathPoint {
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/*< private >*/
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union {
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float f[8];
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gpointer p[8];
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} data;
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};
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GDK_AVAILABLE_IN_4_14
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GType gsk_path_point_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_4_14
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GskPathPoint * gsk_path_point_copy (GskPathPoint *point);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_point_free (GskPathPoint *point);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_point_get_position (GskPath *path,
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const GskPathPoint *point,
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graphene_point_t *position);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_point_get_tangent (GskPath *path,
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const GskPathPoint *point,
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GskPathDirection direction,
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graphene_vec2_t *tangent);
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GDK_AVAILABLE_IN_4_14
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float gsk_path_point_get_curvature (GskPath *path,
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const GskPathPoint *point,
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graphene_point_t *center);
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G_END_DECLS
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