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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.
158 lines
7.7 KiB
C
158 lines
7.7 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 "gskpathopprivate.h"
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#include "gskpath.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 _GskQuadCurve GskQuadCurve;
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typedef struct _GskCubicCurve GskCubicCurve;
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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 _GskQuadCurve
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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[3];
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graphene_point_t coeffs[3];
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};
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struct _GskCubicCurve
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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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union _GskCurve
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{
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GskPathOperation op;
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GskLineCurve line;
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GskQuadCurve quad;
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GskCubicCurve cubic;
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};
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typedef enum {
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GSK_CURVE_LINE_REASON_STRAIGHT,
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GSK_CURVE_LINE_REASON_SHORT
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} GskCurveLineReason;
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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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GskCurveLineReason reason,
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gpointer user_data);
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typedef gboolean (* GskCurveAddCurveFunc) (GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts,
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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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void gsk_curve_print (const GskCurve *curve,
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GString *string);
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char * gsk_curve_to_string (const GskCurve *curve);
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gskpathop gsk_curve_pathop (const GskCurve *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_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_reverse (const GskCurve *curve,
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GskCurve *reverse);
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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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GskPathForeachFlags flags,
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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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#define gsk_curve_builder_to(curve, builder) gsk_path_builder_pathop_to ((builder), gsk_curve_pathop (curve))
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float gsk_curve_get_curvature (const GskCurve *curve,
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float t,
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graphene_point_t *center);
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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_get_crossing (const GskCurve *curve,
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const graphene_point_t *point);
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gboolean gsk_curve_get_closest_point (const GskCurve *curve,
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const graphene_point_t *point,
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float threshold,
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float *out_dist,
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float *out_t);
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G_END_DECLS
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