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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.
74 lines
4.7 KiB
C
74 lines
4.7 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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#pragma once
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#include "gskpathprivate.h"
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#include "gskpathpointprivate.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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GskContour * gsk_standard_contour_new (GskPathFlags flags,
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const graphene_point_t *points,
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gsize n_points,
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const gskpathop *ops,
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gsize n_ops,
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gssize offset);
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void gsk_contour_copy (GskContour * dest,
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const GskContour *src);
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GskContour * gsk_contour_dup (const GskContour *src);
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GskContour * gsk_contour_reverse (const GskContour *src);
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gsize gsk_contour_get_size (const GskContour *self);
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GskPathFlags gsk_contour_get_flags (const GskContour *self);
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void gsk_contour_print (const GskContour *self,
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GString *string);
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gboolean gsk_contour_get_bounds (const GskContour *self,
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GskBoundingBox *bounds);
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gboolean gsk_contour_foreach (const GskContour *self,
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float tolerance,
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GskPathForeachFunc func,
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gpointer user_data);
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void gsk_contour_get_start_end (const GskContour *self,
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graphene_point_t *start,
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graphene_point_t *end);
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int gsk_contour_get_winding (const GskContour *self,
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const graphene_point_t *point);
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gboolean gsk_contour_get_closest_point (const GskContour *self,
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const graphene_point_t *point,
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float threshold,
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GskRealPathPoint *result,
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float *out_dist);
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void gsk_contour_get_position (const GskContour *self,
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GskRealPathPoint *point,
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graphene_point_t *pos);
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void gsk_contour_get_tangent (const GskContour *self,
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GskRealPathPoint *point,
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GskPathDirection direction,
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graphene_vec2_t *tangent);
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float gsk_contour_get_curvature (const GskContour *self,
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GskRealPathPoint *point,
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graphene_point_t *center);
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G_END_DECLS
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