Add a private getter for the stroke path

We will implement stroking by filling the stroke path.

Compute the stroke path ahead of time, so we don't have
to do it over and over.

This may change in the future, at least for simple
strokes, so keep this private.

gsk/gskrendernodeimpl.c

@@ -4567,6 +4567,7 @@ struct _GskStrokeNode
 
   GskRenderNode *child;
   GskPath *path;
+  GskPath *stroke_path;
   GskStroke stroke;
 };
 
@@ -4578,6 +4579,7 @@ gsk_stroke_node_finalize (GskRenderNode *node)
 
   gsk_render_node_unref (self->child);
   gsk_path_unref (self->path);
+  gsk_path_unref (self->stroke_path);
   gsk_stroke_clear (&self->stroke);
 
   parent_class->finalize (node);
@@ -4673,6 +4675,7 @@ gsk_stroke_node_new (GskRenderNode   *child,
   self->child = gsk_render_node_ref (child);
   self->path = gsk_path_ref (path);
   gsk_stroke_init_copy (&self->stroke, stroke);
+  self->stroke_path = gsk_path_stroke (path, &self->stroke);
 
   if (gsk_path_get_stroke_bounds (self->path, &self->stroke, &stroke_bounds))
     graphene_rect_intersection (&stroke_bounds, &child->bounds, &node->bounds);
@@ -4719,6 +4722,16 @@ gsk_stroke_node_get_path (const GskRenderNode *node)
   return self->path;
 }
 
+GskPath *
+gsk_stroke_node_get_stroke_path (const GskRenderNode *node)
+{
+  const GskStrokeNode *self = (const GskStrokeNode *) node;
+
+  g_return_val_if_fail (GSK_IS_RENDER_NODE_TYPE (node, GSK_STROKE_NODE), NULL);
+
+  return self->stroke_path;
+}
+
 /**
  * gsk_stroke_node_get_stroke:
  * @node: (type GskStrokeNode): a stroke #GskRenderNode

gsk/gskrendernodeprivate.h

@@ -87,6 +87,7 @@ gboolean        gsk_container_node_is_disjoint          (const GskRenderNode
 
 gboolean        gsk_render_node_use_offscreen_for_opacity (const GskRenderNode       *node);
 
+GskPath *      gsk_stroke_node_get_stroke_path           (const GskRenderNode *node);
 
 G_END_DECLS