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diff --git a/libmetacity/meta-frame-layout-private.h b/libmetacity/meta-frame-layout-private.h
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+/*
+ * Copyright (C) 2001 Havoc Pennington
+ * Copyright (C) 2016 Alberts Muktupāvels
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef META_FRAME_LAYOUT_PRIVATE_H
+#define META_FRAME_LAYOUT_PRIVATE_H
+
+#include <gtk/gtk.h>
+
+G_BEGIN_DECLS
+
+typedef struct _MetaFrameLayout MetaFrameLayout;
+
+/**
+ * Whether a button's size is calculated from the area around it (aspect
+ * sizing) or is given as a fixed height and width in pixels (fixed sizing).
+ *
+ * \bug This could be done away with; see the comment at the top of
+ * MetaFrameLayout.
+ */
+typedef enum
+{
+  META_BUTTON_SIZING_ASPECT,
+  META_BUTTON_SIZING_FIXED,
+  META_BUTTON_SIZING_LAST
+} MetaButtonSizing;
+
+/**
+ * Various parameters used to calculate the geometry of a frame.
+ * They are used inside a MetaFrameStyle.
+ * This corresponds closely to the <frame_geometry> tag in a theme file.
+ *
+ * \bug button_sizing isn't really necessary, because we could easily say
+ * that if button_aspect is zero, the height and width are fixed values.
+ * This would also mean that MetaButtonSizing didn't need to exist, and
+ * save code.
+ **/
+struct _MetaFrameLayout
+{
+  gint refcount;
+
+  struct {
+    /** Border/padding of the entire frame */
+    GtkBorder frame_border;
+
+    /** Shadow border used in invisible resize area */
+    GtkBorder shadow_border;
+
+    /** Border/padding of the titlebar region */
+    GtkBorder titlebar_border;
+    /** Border/padding of titlebar buttons */
+
+    /** Size of images in buttons */
+    guint icon_size;
+
+    /** Space between titlebar elements */
+    guint titlebar_spacing;
+
+    /** Margin of title */
+    GtkBorder title_margin;
+    /** Margin of titlebar buttons */
+    GtkBorder button_margin;
+
+    /** Min size of titlebar region */
+    GtkRequisition titlebar_min_size;
+    /** Min size of titlebar buttons */
+    GtkRequisition button_min_size;
+  } gtk;
+
+  struct {
+    /** Size of left side */
+    gint left_width;
+    /** Size of right side */
+    gint right_width;
+    /** Size of bottom side */
+    gint bottom_height;
+
+    /** Border of blue title region
+     * \bug (blue?!)
+     **/
+    GtkBorder title_border;
+
+    /** Extra height for inside of title region, above the font height */
+    int title_vertical_pad;
+
+    /** Right indent of buttons from edges of frame */
+    int right_titlebar_edge;
+    /** Left indent of buttons from edges of frame */
+    int left_titlebar_edge;
+
+    /**
+     * Sizing rule of buttons, either META_BUTTON_SIZING_ASPECT
+     * (in which case button_aspect will be honoured, and
+     * button_width and button_height set from it), or
+     * META_BUTTON_SIZING_FIXED (in which case we read the width
+     * and height directly).
+     */
+    MetaButtonSizing button_sizing;
+
+    /**
+     * Ratio of height/width. Honoured only if
+     * button_sizing==META_BUTTON_SIZING_ASPECT.
+     * Otherwise we figure out the height from the button_border.
+     */
+    double button_aspect;
+
+    /** Width of a button; set even when we are using aspect sizing */
+    gint button_width;
+
+    /** Height of a button; set even when we are using aspect sizing */
+    gint button_height;
+  } metacity;
+
+  /** Invisible resize area border */
+  GtkBorder invisible_resize_border;
+
+  /** Space around buttons */
+  GtkBorder button_border;
+
+  /** scale factor for title text */
+  double title_scale;
+
+  /** Whether title text will be displayed */
+  guint has_title : 1;
+
+  /** Whether we should hide the buttons */
+  guint hide_buttons : 1;
+
+  /** Radius of the top left-hand corner; 0 if not rounded */
+  guint top_left_corner_rounded_radius;
+  /** Radius of the top right-hand corner; 0 if not rounded */
+  guint top_right_corner_rounded_radius;
+  /** Radius of the bottom left-hand corner; 0 if not rounded */
+  guint bottom_left_corner_rounded_radius;
+  /** Radius of the bottom right-hand corner; 0 if not rounded */
+  guint bottom_right_corner_rounded_radius;
+};
+
+G_GNUC_INTERNAL
+MetaFrameLayout *meta_frame_layout_new      (void);
+
+G_GNUC_INTERNAL
+MetaFrameLayout *meta_frame_layout_copy     (const MetaFrameLayout  *src);
+
+G_GNUC_INTERNAL
+void             meta_frame_layout_ref      (MetaFrameLayout        *layout);
+
+G_GNUC_INTERNAL
+void             meta_frame_layout_unref    (MetaFrameLayout        *layout);
+
+G_GNUC_INTERNAL
+gboolean         meta_frame_layout_validate (const MetaFrameLayout  *layout,
+                                             GError                **error);
+
+G_END_DECLS
+
+#endif