209ab088e6
Add a function that takes a path, and offsets it by some distance, applying line-join parameters as needed. This commit just adds the api, the implementation will be in the following commit.
133 lines
5.6 KiB
C
133 lines
5.6 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_PATH_H__
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#define __GSK_PATH_H__
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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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/**
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* GskPathForeachFlags:
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* @GSK_PATH_FOREACH_ALLOW_QUAD: Allow emission of %GSK_PATH_QUAD operations
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* @GSK_PATH_FOREACH_ALLOW_CUBIC: Allow emission of %GSK_PATH_CUBIC operations
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* @GSK_PATH_FOREACH_ALLOW_CONIC: Allow emission of %GSK_PATH_CONIC operations
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*
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* Flags that can be passed to gsk_path_foreach() to enable additional
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* features.
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*
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* By default, gsk_path_foreach() will only emit a path with all operations
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* flattened to straight lines to allow for maximum compatibility. The only
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* operations emitted will be %GSK_PATH_MOVE, %GSK_PATH_LINE and %GSK_PATH_CLOSE.
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*/
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typedef enum
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{
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GSK_PATH_FOREACH_ALLOW_QUAD = (1 << 0),
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GSK_PATH_FOREACH_ALLOW_CUBIC = (1 << 1),
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GSK_PATH_FOREACH_ALLOW_CONIC = (1 << 2)
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} GskPathForeachFlags;
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/**
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* GskPathForeachFunc:
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* @op: The operation to perform
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* @pts: The points of the operation
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* @n_pts: The number of points
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* @weight: The weight for conic curves, or unused if not a conic curve.
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* @user_data: The user data provided with the function
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*
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* Prototype of the callback to iterate throught the operations of
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* a path.
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*
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* Returns: %TRUE to continue evaluating the path, %FALSE to
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* immediately abort and not call the function again.
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*/
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typedef gboolean (* GskPathForeachFunc) (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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gpointer user_data);
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#define GSK_TYPE_PATH (gsk_path_get_type ())
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GDK_AVAILABLE_IN_ALL
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GType gsk_path_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_ref (GskPath *self);
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GDK_AVAILABLE_IN_ALL
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void gsk_path_unref (GskPath *self);
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GDK_AVAILABLE_IN_ALL
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void gsk_path_print (GskPath *self,
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GString *string);
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GDK_AVAILABLE_IN_ALL
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char * gsk_path_to_string (GskPath *self);
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_parse (const char *string);
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GDK_AVAILABLE_IN_ALL
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void gsk_path_to_cairo (GskPath *self,
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cairo_t *cr);
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GDK_AVAILABLE_IN_ALL
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gboolean gsk_path_is_empty (GskPath *self);
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GDK_AVAILABLE_IN_ALL
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gboolean gsk_path_get_bounds (GskPath *self,
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graphene_rect_t *bounds);
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GDK_AVAILABLE_IN_ALL
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gboolean gsk_path_get_stroke_bounds (GskPath *self,
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const GskStroke *stroke,
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graphene_rect_t *bounds);
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GDK_AVAILABLE_IN_ALL
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gboolean gsk_path_foreach (GskPath *self,
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GskPathForeachFlags flags,
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GskPathForeachFunc func,
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gpointer user_data);
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_reverse (GskPath *self);
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_transform (GskPath *self,
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GskTransform *transform);
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_stroke (GskPath *self,
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GskStroke *stroke);
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GDK_AVAILABLE_IN_ALL
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GskPath * gsk_path_offset (GskPath *self,
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float distance,
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GskLineJoin line_join,
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float miter_limit);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GskPath, gsk_path_unref)
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G_END_DECLS
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#endif /* __GSK_PATH_H__ */
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