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API: Add gsk_path_offset

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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.
This commit is contained in:
Matthias Clasen
2023-06-22 22:42:27 -04:00
parent be94463521
commit 3965ee59cd
4 changed files with 89 additions and 0 deletions
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45
gsk/gskcontour.c
View File

@@ -93,6 +93,11 @@ struct _GskContourClass
void (* add_stroke) (const GskContour *contour,
GskPathBuilder *builder,
GskStroke *stroke);
void (* offset) (const GskContour *contour,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit);
};
static gsize
@@ -520,6 +525,15 @@ gsk_rect_contour_add_stroke (const GskContour *contour,
{
}
static void
gsk_rect_contour_offset (const GskContour *contour,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit)
{
}
static const GskContourClass GSK_RECT_CONTOUR_CLASS =
{
sizeof (GskRectContour),
@@ -541,6 +555,7 @@ static const GskContourClass GSK_RECT_CONTOUR_CLASS =
gsk_rect_contour_get_stroke_bounds,
gsk_rect_contour_reverse,
gsk_rect_contour_add_stroke,
gsk_rect_contour_offset,
};
GskContour *
@@ -954,6 +969,15 @@ gsk_circle_contour_add_stroke (const GskContour *contour,
{
}
static void
gsk_circle_contour_offset (const GskContour *contour,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit)
{
}
static const GskContourClass GSK_CIRCLE_CONTOUR_CLASS =
{
sizeof (GskCircleContour),
@@ -975,6 +999,7 @@ static const GskContourClass GSK_CIRCLE_CONTOUR_CLASS =
gsk_circle_contour_get_stroke_bounds,
gsk_circle_contour_reverse,
gsk_circle_contour_add_stroke,
gsk_circle_contour_offset,
};
GskContour *
@@ -1819,6 +1844,15 @@ gsk_standard_contour_add_stroke (const GskContour *contour,
{
}
static void
gsk_standard_contour_offset (const GskContour *contour,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit)
{
}
static const GskContourClass GSK_STANDARD_CONTOUR_CLASS =
{
sizeof (GskStandardContour),
@@ -1840,6 +1874,7 @@ static const GskContourClass GSK_STANDARD_CONTOUR_CLASS =
gsk_standard_contour_get_stroke_bounds,
gsk_standard_contour_reverse,
gsk_standard_contour_add_stroke,
gsk_standard_contour_offset,
};
/* You must ensure the contour has enough size allocated,
@@ -2027,6 +2062,16 @@ gsk_contour_add_stroke (const GskContour *self,
self->klass->add_stroke (self, builder, stroke);
}
void
gsk_contour_offset (const GskContour *self,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit)
{
self->klass->offset (self, builder, distance, line_join, miter_limit);
}
void
gsk_contour_copy (GskContour *dest,
const GskContour *src)

6
gsk/gskcontourprivate.h
View File

@@ -107,6 +107,12 @@ void gsk_contour_default_add_stroke (const GskContou
GskPathBuilder *builder,
GskStroke *stroke);
void gsk_contour_offset (const GskContour *contour,
GskPathBuilder *builder,
float distance,
GskLineJoin line_join,
float miter_limit);
G_END_DECLS
#endif /* __GSK_CONTOUR_PRIVATE_H__ */

32
gsk/gskpath.c
View File

@@ -1394,3 +1394,35 @@ gsk_path_stroke (GskPath *self,
return gsk_path_builder_free_to_path (builder);
}
/**
* gsk_path_offset:
* @self: a `GskPath`
* @distance: the distance to offset the path by
* @line_join: how joins are supposed to be drawn
* @miter_limit: miter limit for joins
*
* Create a new path that is offset from @self by @distance.
*
* The offset can be positive (to the right) or negative
* (to the left). The @line_join and @miter_limit arguments
* influence how joins between the offset path segments
* are made.
*
* Returns: a new `GskPath`
*/
GskPath *
gsk_path_offset (GskPath *self,
float distance,
GskLineJoin line_join,
float miter_limit)
{
GskPathBuilder *builder;
builder = gsk_path_builder_new ();
for (int i = 0; i < self->n_contours; i++)
gsk_contour_offset (gsk_path_get_contour (self, i), builder, distance, line_join, miter_limit);
return gsk_path_builder_free_to_path (builder);
}

6
gsk/gskpath.h
View File

@@ -121,6 +121,12 @@ GDK_AVAILABLE_IN_ALL
GskPath * gsk_path_stroke (GskPath *self,
GskStroke *stroke);
GDK_AVAILABLE_IN_ALL
GskPath * gsk_path_offset (GskPath *self,
float distance,
GskLineJoin line_join,
float miter_limit);
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GskPath, gsk_path_unref)
G_END_DECLS