/*
 * Copyright © 2020 Benjamin Otte
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authors: Benjamin Otte <otte@gnome.org>
 */

#pragma once

#if !defined (__GSK_H_INSIDE__) && !defined (GTK_COMPILATION)
#error "Only <gsk/gsk.h> can be included directly."
#endif


#include <gsk/gsktypes.h>

G_BEGIN_DECLS

/**
 * GskPathForeachFlags:
 * @GSK_PATH_FOREACH_ALLOW_ONLY_LINES: The default behavior, only allow lines.
 * @GSK_PATH_FOREACH_ALLOW_QUAD: Allow emission of `GSK_PATH_QUAD` operations
 * @GSK_PATH_FOREACH_ALLOW_CUBIC: Allow emission of `GSK_PATH_CUBIC` operations.
 * @GSK_PATH_FOREACH_ALLOW_CONIC: Allow emission of `GSK_PATH_CONIC` operations.
 *
 * Flags that can be passed to gsk_path_foreach() to influence what
 * kinds of operations the path is decomposed into.
 *
 * By default, [method@Gsk.Path.foreach] will only emit a path with all
 * operations flattened to straight lines to allow for maximum compatibility.
 * The only operations emitted will be `GSK_PATH_MOVE`, `GSK_PATH_LINE` and
 * `GSK_PATH_CLOSE`.
 *
 * Since: 4.14
 */
typedef enum
{
  GSK_PATH_FOREACH_ALLOW_ONLY_LINES = 0,
  GSK_PATH_FOREACH_ALLOW_QUAD       = (1 << 0),
  GSK_PATH_FOREACH_ALLOW_CUBIC      = (1 << 1),
  GSK_PATH_FOREACH_ALLOW_CONIC      = (1 << 2),
} GskPathForeachFlags;

/**
 * GskPathForeachFunc:
 * @op: The operation
 * @pts: (array length=n_pts): The points of the operation
 * @n_pts: The number of points
 * @weight: The weight for conic curves, or unused if not a conic curve
 * @user_data: The user data provided with the function
 *
 * Type of the callback to iterate through the operations of a path.
 *
 * For each operation, the callback is given the @op itself, the points
 * that the operation is applied to in @pts, and a @weight for conic
 * curves. The @n_pts argument is somewhat redundant, since the number
 * of points can be inferred from the operation.
 *
 * Each contour of the path starts with a @GSK_PATH_MOVE operation.
 * Closed contours end with a @GSK_PATH_CLOSE operation.
 *
 * Returns: %TRUE to continue iterating the path, %FALSE to
 *   immediately abort and not call the function again.
 */
typedef gboolean (* GskPathForeachFunc) (GskPathOperation        op,
                                         const graphene_point_t *pts,
                                         gsize                   n_pts,
                                         float                   weight,
                                         gpointer                user_data);

#define GSK_TYPE_PATH (gsk_path_get_type ())

GDK_AVAILABLE_IN_4_14
GType                   gsk_path_get_type                       (void) G_GNUC_CONST;

GDK_AVAILABLE_IN_4_14
GskPath *               gsk_path_ref                            (GskPath                *self);
GDK_AVAILABLE_IN_4_14
void                    gsk_path_unref                          (GskPath                *self);

GDK_AVAILABLE_IN_4_14
void                    gsk_path_print                          (GskPath                *self,
                                                                 GString                *string);
GDK_AVAILABLE_IN_4_14
char *                  gsk_path_to_string                      (GskPath                *self);

GDK_AVAILABLE_IN_4_14
GskPath *               gsk_path_parse                          (const char             *string);

GDK_AVAILABLE_IN_4_14
void                    gsk_path_to_cairo                       (GskPath                *self,
                                                                 cairo_t                *cr);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_is_empty                       (GskPath                *self);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_is_closed                      (GskPath                *self);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_get_bounds                     (GskPath                *self,
                                                                 graphene_rect_t        *bounds) G_GNUC_WARN_UNUSED_RESULT;

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_get_stroke_bounds              (GskPath                *self,
                                                                 const GskStroke        *stroke,
                                                                 graphene_rect_t        *bounds);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_in_fill                        (GskPath                *self,
                                                                 const graphene_point_t *point,
                                                                 GskFillRule             fill_rule);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_get_start_point                (GskPath                *self,
                                                                 GskPathPoint           *result);
GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_get_end_point                  (GskPath                *self,
                                                                 GskPathPoint           *result);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_get_closest_point              (GskPath                *self,
                                                                 const graphene_point_t *point,
                                                                 float                   threshold,
                                                                 GskPathPoint           *result,
                                                                 float                  *distance);

GDK_AVAILABLE_IN_4_14
gboolean                gsk_path_foreach                        (GskPath                *self,
                                                                 GskPathForeachFlags     flags,
                                                                 GskPathForeachFunc      func,
                                                                 gpointer                user_data);

/**
 * GskPathIntersection:
 * @GSK_PATH_INTERSECTION_NONE: No intersection
 * @GSK_PATH_INTERSECTION_NORMAL: A normal intersection, where the two paths
 *   cross each other
 * @GSK_PATH_INTERSECTION_START: The start of a segment where the two paths coincide
 * @GSK_PATH_INTERSECTION_END: The end of a segment where the two paths coincide
 *
 * The values of this enumeration classify intersections
 * between paths.
 *
 * Since: 4.20
 */
typedef enum
{
  GSK_PATH_INTERSECTION_NONE,
  GSK_PATH_INTERSECTION_NORMAL,
  GSK_PATH_INTERSECTION_START,
  GSK_PATH_INTERSECTION_END,
} GskPathIntersection;

/**
 * GskPathIntersectionFunc:
 * @path1: the first path
 * @point1: the intersection as point on @path1
 * @path2: the second path
 * @point2: the intersection as point on @path2
 * @kind: the nature of the intersection
 * @user_data: user data
 *
 * Prototype of the callback to iterate through the
 * intersections of two paths.
 *
 * Returns: true to continue iterating, false to
 *   stop the iteration and not call the function again
 *
 * Since: 4.20
 */
typedef gboolean (* GskPathIntersectionFunc)                    (GskPath                *path1,
                                                                 const GskPathPoint     *point1,
                                                                 GskPath                *path2,
                                                                 const GskPathPoint     *point2,
                                                                 GskPathIntersection     kind,
                                                                 gpointer                user_data);

GDK_AVAILABLE_IN_4_20
gboolean                gsk_path_foreach_intersection           (GskPath                *path1,
                                                                 GskPath                *path2,
                                                                 GskPathIntersectionFunc func,
                                                                 gpointer                user_data);

G_DEFINE_AUTOPTR_CLEANUP_FUNC(GskPath, gsk_path_unref)

G_END_DECLS
