mtk: Add a copy of MetaRectangle

Just to get the basics for porting Cogl to using it instead of
cairo_rectangle_int_t.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3128>

mtk/mtk/meson.build

@@ -3,9 +3,11 @@ mtk_mtk_includesubdir = mtk_includesubdir / 'mtk'
 mtk_headers = [
   'mtk.h',
   'mtk-macros.h',
+  'mtk-rectangle.h',
 ]
 
 mtk_sources = [
+  'mtk-rectangle.c',
 ]
 
 mtk_private_headers = [

mtk/mtk/mtk-rectangle.c

@@ -0,0 +1,38 @@
+/*
+ * Mtk
+ *
+ * A low-level base library.
+ *
+ * Copyright (C) 2023 Red Hat
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "mtk/mtk-rectangle.h"
+
+
+MtkRectangle *
+mtk_rectangle_copy (const MtkRectangle *rect)
+{
+  return g_memdup2 (rect, sizeof (MtkRectangle));
+}
+
+void
+mtk_rectangle_free (MtkRectangle *rect)
+{
+  g_free (rect);
+}
+
+G_DEFINE_BOXED_TYPE (MtkRectangle, mtk_rectangle,
+                     mtk_rectangle_copy, mtk_rectangle_free);

mtk/mtk/mtk-rectangle.h

@@ -0,0 +1,66 @@
+/*
+ * Mtk
+ *
+ * A low-level base library.
+ *
+ * Copyright (C) 2023 Red Hat
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <cairo.h>
+#include <glib-object.h>
+
+#include "mtk/mtk-macros.h"
+
+#define MTK_TYPE_RECTANGLE            (mtk_rectangle_get_type ())
+
+/**
+ * MtkRectangle:
+ * @x: X coordinate of the top-left corner
+ * @y: Y coordinate of the top-left corner
+ * @width: Width of the rectangle
+ * @height: Height of the rectangle
+ */
+#ifdef __GI_SCANNER__
+/* The introspection scanner is currently unable to lookup how
+ * cairo_rectangle_int_t is actually defined. This prevents
+ * introspection data for the GdkRectangle type to include fields
+ * descriptions. To workaround this issue, we define it with the same
+ * content as cairo_rectangle_int_t, but only under the introspection
+ * define.
+ */
+struct _MtkRectangle
+{
+  int x;
+  int y;
+  int width;
+  int height;
+};
+typedef struct _MtkRectangle MtkRectangle;
+#else
+typedef cairo_rectangle_int_t MtkRectangle;
+#endif
+
+MTK_EXPORT
+GType mtk_rectangle_get_type (void);
+
+MTK_EXPORT
+MtkRectangle * mtk_rectangle_copy (const MtkRectangle *rect);
+
+MTK_EXPORT
+void mtk_rectangle_free (MtkRectangle *rect);
+

mtk/mtk/mtk.h

@@ -23,6 +23,7 @@
 
 #define __MTK_H_INSIDE__
 
+#include "mtk/mtk-rectangle.h"
 #include "mtk/mtk-macros.h"
 
 #undef __MTK_H_INSIDE__