mtk: Add mtk_rectangle_contains_pointf()

This variant works on floating point coordinates, in order
to avoid undesired effects with rounding.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3820>

mtk/mtk/mtk-rectangle.c

@@ -297,6 +297,22 @@ gboolean
 mtk_rectangle_contains_point (const MtkRectangle *rect,
                               int                 x,
                               int                 y)
+{
+  return mtk_rectangle_contains_pointf (rect, x, y);
+}
+
+/**
+ * mtk_rectangle_contains_pointf:
+ * @rect: A rectangle
+ * @x: X coordinate of the point
+ * @y: Y coordinate of the point
+ *
+ * Returns: Whether the rectangle contains the point
+ */
+gboolean
+mtk_rectangle_contains_pointf (const MtkRectangle *rect,
+                               float               x,
+                               float               y)
 {
   return (x >= rect->x &&
           x <  (rect->x + rect->width) &&

mtk/mtk/mtk-rectangle.h

@@ -131,6 +131,10 @@ MTK_EXPORT
 gboolean mtk_rectangle_contains_point (const MtkRectangle *rect,
                                        int                 x,
                                        int                 y);
+MTK_EXPORT
+gboolean mtk_rectangle_contains_pointf (const MtkRectangle *rect,
+                                        float               x,
+                                        float               y);
 
 MTK_EXPORT
 graphene_rect_t mtk_rectangle_to_graphene_rect (const MtkRectangle *rect);