[gtk/path-work-rebased: 115/123] pathbuilder: Add gsk_path_builder_add_layout

[Matthias Clasen <matthiasc src gnome org>]

commit 80b900466e62f670cae01af945b6a3a8fc467767
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Dec 27 00:59:02 2020 -0500

    pathbuilder: Add gsk_path_builder_add_layout
    
    This api makes it easy to turn text into a path that
    can be further manipulated.
    
    The implementation currently goes via cairo.

 gsk/gskpathbuilder.c | 32 ++++++++++++++++++++++++++++++++
 gsk/gskpathbuilder.h |  4 ++++
 2 files changed, 36 insertions(+)
---
diff --git a/gsk/gskpathbuilder.c b/gsk/gskpathbuilder.c
index 7ea5ba8d7e..ff4c024398 100644
--- a/gsk/gskpathbuilder.c
+++ b/gsk/gskpathbuilder.c
@@ -930,3 +930,35 @@ gsk_path_builder_svg_arc_to (GskPathBuilder *builder,
                    t);
     }
 }
+
+/**
+ * gsk_path_builder_add_layout:
+ * @builder: a `GskPathBuilder`
+ * @layout: the pango layout to add
+ *
+ * Adds the outlines for the glyphs in @layout to @builder.
+ */
+void
+gsk_path_builder_add_layout (GskPathBuilder *builder,
+                             PangoLayout    *layout)
+{
+  cairo_surface_t *surface;
+  cairo_t *cr;
+  cairo_path_t *cairo_path;
+  GskPath *path;
+
+  surface = cairo_recording_surface_create (CAIRO_CONTENT_COLOR_ALPHA, NULL);
+  cr = cairo_create (surface);
+
+  pango_cairo_layout_path (cr, layout);
+  cairo_path = cairo_copy_path_flat (cr);
+  path = gsk_path_new_from_cairo (cairo_path);
+
+  gsk_path_builder_add_path (builder, path);
+
+  gsk_path_unref (path);
+
+  cairo_path_destroy (cairo_path);
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+}
diff --git a/gsk/gskpathbuilder.h b/gsk/gskpathbuilder.h
index a28d90100d..c02c9f1d21 100644
--- a/gsk/gskpathbuilder.h
+++ b/gsk/gskpathbuilder.h
@@ -123,6 +123,10 @@ void                    gsk_path_builder_rel_conic_to           (GskPathBuilder
 GDK_AVAILABLE_IN_ALL
 void                    gsk_path_builder_close                  (GskPathBuilder         *builder);
 
+GDK_AVAILABLE_IN_ALL
+void                    gsk_path_builder_add_layout             (GskPathBuilder         *builder,
+                                                                 PangoLayout            *layout);
+
 G_END_DECLS
 
 #endif /* __GSK_PATH_BUILDER_H__ */