From b925581e37b2ac2ffdb97469fbfb284aac93feab Mon Sep 17 00:00:00 2001
From: Victor Kareh <vkareh@redhat.com>
Date: Wed, 22 May 2019 11:12:24 -0400
Subject: 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
---
 src/ui/frames.c | 34 ++++++++++++++++++++++++++++++++++
 src/ui/frames.h |  8 ++++++++
 src/ui/ui.c     | 13 +++++++++++++
 3 files changed, 55 insertions(+)

(limited to 'src/ui')

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,
diff --git a/src/ui/frames.h b/src/ui/frames.h
index 0af5ed89..cde51e60 100644
--- a/src/ui/frames.h
+++ b/src/ui/frames.h
@@ -144,6 +144,14 @@ cairo_region_t *meta_frames_get_frame_bounds (MetaFrames *frames,
                                               Window      xwindow,
                                               int         window_width,
                                               int         window_height);
+
+void meta_frames_get_corner_radiuses (MetaFrames *frames,
+                                      Window      xwindow,
+                                      float      *top_left,
+                                      float      *top_right,
+                                      float      *bottom_left,
+                                      float      *bottom_right);
+
 void meta_frames_move_resize_frame (MetaFrames *frames,
 				    Window      xwindow,
 				    int         x,
diff --git a/src/ui/ui.c b/src/ui/ui.c
index a7058066..c805869f 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -302,6 +302,19 @@ meta_ui_get_frame_borders (MetaUI *ui,
   meta_frames_get_borders (ui->frames, frame_xwindow, borders);
 }
 
+void
+meta_ui_get_corner_radiuses (MetaUI *ui,
+                             Window  xwindow,
+                             float  *top_left,
+                             float  *top_right,
+                             float  *bottom_left,
+                             float  *bottom_right)
+{
+  meta_frames_get_corner_radiuses (ui->frames, xwindow,
+                                   top_left, top_right,
+                                   bottom_left, bottom_right);
+}
+
 static void
 set_background_none (Display *xdisplay,
                      Window   xwindow)
-- 
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