[mutter] clutter/util: Add functions for managing cairo and clutter rects

[Marco Trevisan <marcotrevi src gnome org>]

commit e5a9e9c93b42312e4305f603f50029a160670389
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Mar 1 15:43:14 2019 +0100

    clutter/util: Add functions for managing cairo and clutter rects
    
    Utility functions to easily convert from ClutterRect to cairo int rects and
    vice-versa.
    
    And add ability to offset a cairo rect.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/3

 clutter/clutter/clutter-private.h |  8 ++++++++
 clutter/clutter/clutter-util.c    | 26 ++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
---
diff --git a/clutter/clutter/clutter-private.h b/clutter/clutter/clutter-private.h
index cbfaaa7f0..a5cd1fa19 100644
--- a/clutter/clutter/clutter-private.h
+++ b/clutter/clutter/clutter-private.h
@@ -249,6 +249,14 @@ void  _clutter_util_fully_transform_vertices (const CoglMatrix    *modelview,
 void _clutter_util_rect_from_rectangle (const cairo_rectangle_int_t *src,
                                         ClutterRect                 *dest);
 
+void _clutter_util_rectangle_int_extents (const ClutterRect     *src,
+                                          cairo_rectangle_int_t *dest);
+
+void _clutter_util_rectangle_offset (const cairo_rectangle_int_t *src,
+                                     int                          x,
+                                     int                          y,
+                                     cairo_rectangle_int_t       *dest);
+
 void _clutter_util_rectangle_union (const cairo_rectangle_int_t *src1,
                                     const cairo_rectangle_int_t *src2,
                                     cairo_rectangle_int_t       *dest);
diff --git a/clutter/clutter/clutter-util.c b/clutter/clutter/clutter-util.c
index 49423e802..ed52b6977 100644
--- a/clutter/clutter/clutter-util.c
+++ b/clutter/clutter/clutter-util.c
@@ -120,6 +120,32 @@ void _clutter_util_rect_from_rectangle (const cairo_rectangle_int_t *src,
   };
 }
 
+void _clutter_util_rectangle_int_extents (const  ClutterRect    *src,
+                                          cairo_rectangle_int_t *dest)
+{
+  ClutterRect tmp = *src;
+
+  clutter_rect_clamp_to_pixel (&tmp);
+
+  *dest = (cairo_rectangle_int_t) {
+    .x = tmp.origin.x,
+    .y = tmp.origin.y,
+    .width = tmp.size.width,
+    .height = tmp.size.height,
+  };
+}
+
+void _clutter_util_rectangle_offset (const cairo_rectangle_int_t *src,
+                                     int                          x,
+                                     int                          y,
+                                     cairo_rectangle_int_t       *dest)
+{
+  *dest = *src;
+
+  dest->x += x;
+  dest->y += y;
+}
+
 /*< private >
  * _clutter_util_rectangle_union:
  * @src1: first rectangle to union