frame: Add "get_corner_radiuses" chain

https://bugzilla.gnome.org/show_bug.cgi?id=628195

upstream commit:
https://gitlab.gnome.org/GNOME/metacity/commit/3994d7a0

1 files changed, 34 insertions, 0 deletions

diff --git a/src/ui/frames.c b/src/ui/frames.c
index 9c3f3296..1af79765 100644
--- a/src/ui/frames.c
+++ b/src/ui/frames.c
@@ -806,6 +806,40 @@ meta_frames_get_borders (MetaFrames       *frames,
   borders->visible.right *= scale;
 }
 
+void
+meta_frames_get_corner_radiuses (MetaFrames *frames,
+                                 Window      xwindow,
+                                 float      *top_left,
+                                 float      *top_right,
+                                 float      *bottom_left,
+                                 float      *bottom_right)
+{
+  MetaUIFrame *frame;
+  MetaFrameGeometry fgeom;
+
+  frame = meta_frames_lookup_window (frames, xwindow);
+
+  meta_frames_calc_geometry (frames, frame, &fgeom);
+
+  /* For compatibility with the code in get_visible_rect(), there's
+   * a mysterious sqrt() added to the corner radiuses:
+   *
+   * const float radius = sqrt(corner) + corner;
+   *
+   * It's unclear why the radius is calculated like this, but we
+   * need to be consistent with it.
+   */
+
+  if (top_left)
+    *top_left = fgeom.top_left_corner_rounded_radius + sqrt(fgeom.top_left_corner_rounded_radius);
+  if (top_right)
+    *top_right = fgeom.top_right_corner_rounded_radius + sqrt(fgeom.top_right_corner_rounded_radius);
+  if (bottom_left)
+    *bottom_left = fgeom.bottom_left_corner_rounded_radius + sqrt(fgeom.bottom_left_corner_rounded_radius);
+  if (bottom_right)
+    *bottom_right = fgeom.bottom_right_corner_rounded_radius + sqrt(fgeom.bottom_right_corner_rounded_radius);
+}
+
 #ifdef HAVE_SHAPE
 static void
 apply_cairo_region_to_window (Display        *display,