Implement stroking

Implement gsk_contour_default_add_stroke, which takes a contour
and stroke parameters, and adds contours to a path builder for
the outline that would be produced by stroking the path with these
parameters.

The current implementation does not try to handle short segments
in the vicinity of sharp joins in any special way, so there can
be some artifacts in that situation.

gsk/gskcontour.c

@@ -555,6 +555,8 @@ gsk_rect_contour_add_stroke (const GskContour *contour,
       rect.size.width = - rect.size.width;
       gsk_path_builder_add_rect (builder, &rect);
     }
+  else
+    gsk_contour_default_add_stroke (contour, builder, stroke);
 }
 
 static void
@@ -1016,6 +1018,8 @@ gsk_circle_contour_add_stroke (const GskContour *contour,
                                   self->start_angle);
       gsk_path_builder_add_contour (builder, c);
     }
+  else
+    gsk_contour_default_add_stroke (contour, builder, stroke);
 }
 
 static void
@@ -1891,6 +1895,7 @@ gsk_standard_contour_add_stroke (const GskContour *contour,
                                  GskPathBuilder   *builder,
                                  GskStroke        *stroke)
 {
+  gsk_contour_default_add_stroke (contour, builder, stroke);
 }
 
 static void

gsk/gskpath.c

@@ -40,6 +40,7 @@
  * The `GskPathBuilder` structure is meant to help in this endeavor.
  */
 
+
 struct _GskPath
 {
   /*< private >*/

gsk/gskpathmeasure.c

@@ -20,6 +20,7 @@
 #include "config.h"
 
 #include "gskpathmeasure.h"
+#include "gskpathbuilder.h"
 
 #include "gskpathbuilder.h"
 #include "gskpathprivate.h"

gsk/meson.build

@@ -30,6 +30,7 @@ gsk_public_sources = files([
   'gskpathbuilder.c',
   'gskpathdash.c',
   'gskpathmeasure.c',
+  'gskpathstroke.c',
   'gskrenderer.c',
   'gskrendernode.c',
   'gskrendernodeimpl.c',