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path: Add gsk_path_foreach()

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This commit is contained in:
Benjamin Otte
2020-11-18 05:15:28 +01:00
committed by Matthias Clasen
parent e69a774da9
commit 32fb2667ff
4 changed files with 147 additions and 9 deletions
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24
gsk/gskenums.h
View File

@@ -235,6 +235,30 @@ typedef enum {
GSK_LINE_JOIN_BEVEL
} GskLineJoin;
/**
* GskPathOperation:
* @GSK_PATH_MOVE: A move-to operation, with 1 point describing the
* target point.
* @GSK_PATH_LINE: A line-to operation, with 2 points describing the
* start and end point of a straight line.
* @GSK_PATH_CLOSE: A close operation ending the current contour with
* a line back to the starting point. Two points describe the start
* and end of the line.
* @GSK_PATH_CURVE: A curve-to operation describing a cubic Bézier curve
* with 4 points describing the start point, the two control points
* and the end point of the curve.
*
* Path operations can be used to approximate a #GskPath.
*
* More values may be added in the future.
**/
typedef enum {
GSK_PATH_MOVE,
GSK_PATH_CLOSE,
GSK_PATH_LINE,
GSK_PATH_CURVE,
} GskPathOperation;
/**
* GskSerializationError:
* @GSK_SERIALIZATION_UNSUPPORTED_FORMAT: The format can not be identified

106
gsk/gskpath.c
View File

@@ -22,7 +22,7 @@
#include "gskpathprivate.h"
typedef enum
typedef enum
{
GSK_PATH_FLAT,
GSK_PATH_CLOSED
@@ -49,6 +49,10 @@ struct _GskContourClass
cairo_t *cr);
gboolean (* get_bounds) (const GskContour *contour,
graphene_rect_t *bounds);
gboolean (* foreach) (const GskContour *contour,
float tolerance,
GskPathForeachFunc func,
gpointer user_data);
gpointer (* init_measure) (const GskContour *contour,
float *out_length);
void (* free_measure) (const GskContour *contour,
@@ -175,6 +179,29 @@ gsk_rect_contour_get_bounds (const GskContour *contour,
return TRUE;
}
static gboolean
gsk_rect_contour_foreach (const GskContour *contour,
float tolerance,
GskPathForeachFunc func,
gpointer user_data)
{
const GskRectContour *self = (const GskRectContour *) contour;
graphene_point_t pts[] = {
GRAPHENE_POINT_INIT (self->x, self->y),
GRAPHENE_POINT_INIT (self->x + self->width, self->y),
GRAPHENE_POINT_INIT (self->x + self->width, self->y + self->height),
GRAPHENE_POINT_INIT (self->x, self->y + self->height),
GRAPHENE_POINT_INIT (self->x, self->y)
};
return func (GSK_PATH_MOVE, &pts[0], 1, user_data)
&& func (GSK_PATH_LINE, &pts[0], 2, user_data)
&& func (GSK_PATH_LINE, &pts[1], 2, user_data)
&& func (GSK_PATH_LINE, &pts[2], 2, user_data)
&& func (GSK_PATH_CLOSE, &pts[3], 2, user_data);
}
static gpointer
gsk_rect_contour_init_measure (const GskContour *contour,
float *out_length)
@@ -276,6 +303,7 @@ static const GskContourClass GSK_RECT_CONTOUR_CLASS =
gsk_rect_contour_print,
gsk_rect_contour_to_cairo,
gsk_rect_contour_get_bounds,
gsk_rect_contour_foreach,
gsk_rect_contour_init_measure,
gsk_rect_contour_free_measure,
gsk_rect_contour_copy,
@@ -300,14 +328,6 @@ gsk_rect_contour_init (GskContour *contour,
/* STANDARD CONTOUR */
typedef enum
{
GSK_PATH_MOVE,
GSK_PATH_CLOSE,
GSK_PATH_LINE,
GSK_PATH_CURVE,
} GskPathOperation;
typedef struct _GskStandardOperation GskStandardOperation;
struct _GskStandardOperation {
@@ -345,6 +365,30 @@ gsk_standard_contour_get_size (const GskContour *contour)
return gsk_standard_contour_compute_size (self->n_ops, self->n_points);
}
static gboolean
gsk_standard_contour_foreach (const GskContour *contour,
float tolerance,
GskPathForeachFunc func,
gpointer user_data)
{
const GskStandardContour *self = (const GskStandardContour *) contour;
gsize i;
const gsize n_points[] = {
[GSK_PATH_MOVE] = 1,
[GSK_PATH_CLOSE] = 2,
[GSK_PATH_LINE] = 2,
[GSK_PATH_CURVE] = 4
};
for (i = 0; i < self->n_ops; i ++)
{
if (!func (self->ops[i].op, &self->points[self->ops[i].point], n_points[self->ops[i].op], user_data))
return FALSE;
}
return TRUE;
}
static GskPathFlags
gsk_standard_contour_get_flags (const GskContour *contour)
{
@@ -649,6 +693,7 @@ static const GskContourClass GSK_STANDARD_CONTOUR_CLASS =
gsk_standard_contour_print,
gsk_standard_contour_to_cairo,
gsk_standard_contour_get_bounds,
gsk_standard_contour_foreach,
gsk_standard_contour_init_measure,
gsk_standard_contour_free_measure,
gsk_standard_contour_copy,
@@ -704,6 +749,15 @@ gsk_contour_dup (const GskContour *src)
return copy;
}
static gboolean
gsk_contour_foreach (const GskContour *contour,
float tolerance,
GskPathForeachFunc func,
gpointer user_data)
{
return contour->klass->foreach (contour, tolerance, func, user_data);
}
gpointer
gsk_contour_init_measure (GskPath *path,
gsize i,
@@ -1004,6 +1058,40 @@ gsk_path_get_bounds (GskPath *self,
return TRUE;
}
/**
* gsk_path_foreach:
* @self: a `GskPath`
* @func: (scope call) (closure user_data): the function to call for operations
* @user_data: (nullable): user data passed to @func
*
* Calls @func for every operation of the path.
*
* Note that this only approximates @self, because paths can contain optimizations
* for various specialized contours.
*
* Returns: %FALSE if @func returned %FALSE, %TRUE otherwise.
**/
gboolean
gsk_path_foreach (GskPath *self,
GskPathForeachFunc func,
gpointer user_data)
{
gsize i;
g_return_val_if_fail (self != NULL, FALSE);
g_return_val_if_fail (func, FALSE);
for (i = 0; i < self->n_contours; i++)
{
if (!gsk_contour_foreach (self->contours[i], GSK_PATH_TOLERANCE_DEFAULT, func, user_data))
return FALSE;
}
return TRUE;
}
/* BUILDER */
/**
* GskPathBuilder:
*

23
gsk/gskpath.h
View File

@@ -29,6 +29,24 @@
G_BEGIN_DECLS
/**
* GskPathForeachFunc:
* @op: The operation to perform
* @pts: The points of the operation
* @n_pts: The number of points
* @user_data: The user data provided with the function
*
* Prototype of the callback to iterate throught the operations of
* a path.
*
* Returns: %TRUE to continue evaluating 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,
gpointer user_data);
#define GSK_TYPE_PATH (gsk_path_get_type ())
GDK_AVAILABLE_IN_ALL
@@ -56,6 +74,11 @@ GDK_AVAILABLE_IN_ALL
gboolean gsk_path_get_bounds (GskPath *self,
graphene_rect_t *bounds);
GDK_AVAILABLE_IN_ALL
gboolean gsk_path_foreach (GskPath *self,
GskPathForeachFunc func,
gpointer user_data);
#define GSK_TYPE_PATH_BUILDER (gsk_path_builder_get_type ())
typedef struct _GskPathBuilder GskPathBuilder;

3
gsk/gskpathprivate.h
View File

@@ -25,6 +25,9 @@
G_BEGIN_DECLS
/* Same as Cairo, so looks like a good value. ¯\_(ツ)_/¯ */
#define GSK_PATH_TOLERANCE_DEFAULT (0.1)
gsize gsk_path_get_n_contours (GskPath *path);
gpointer gsk_contour_init_measure (GskPath *path,