Implement boolean operations on paths

Implement union, intersection, difference and
symmetric difference of two paths, as well as
simplification of a single path.

gsk/gskpathprivate.h

@@ -56,5 +56,19 @@ gboolean                gsk_path_foreach_with_tolerance         (GskPath
 void                    gsk_path_builder_add_contour            (GskPathBuilder         *builder,
                                                                  GskContour             *contour);
 
+typedef enum
+{
+  GSK_PATH_OP_SIMPLIFY,
+  GSK_PATH_OP_UNION,
+  GSK_PATH_OP_INTERSECTION,
+  GSK_PATH_OP_DIFFERENCE,
+  GSK_PATH_OP_XOR
+} GskPathOp;
+
+GskPath *               gsk_path_op                             (GskPathOp               operation,
+                                                                 GskFillRule             fill_rule,
+                                                                 GskPath                *first,
+                                                                 GskPath                *second);
+
 G_END_DECLS
 

gsk/meson.build

@@ -30,6 +30,7 @@ gsk_public_sources = files([
   'gskpathbuilder.c',
   'gskpathintersect.c',
   'gskpathmeasure.c',
+  'gskpathops.c',
   'gskpathparser.c',
   'gskpathpoint.c',
   'gskrenderer.c',