[metacity/wip/invisible-borders: 24/25] compositor: fix border_size

[Alberts Muktupāvels <muktupavels src gnome org>]

commit ccbfd9679783f65349f6a1b4838b857d333e0cfc
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Jan 20 05:02:26 2015 +0200

    compositor: fix border_size

 src/compositor/compositor-xrender.c |   52 +++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)
---
diff --git a/src/compositor/compositor-xrender.c b/src/compositor/compositor-xrender.c
index 38ac0d9..0e59ff3 100644
--- a/src/compositor/compositor-xrender.c
+++ b/src/compositor/compositor-xrender.c
@@ -1079,13 +1079,52 @@ win_extents (MetaCompWindow *cw)
 }
 
 static XserverRegion
+cairo_region_to_xregion (Display        *xdisplay,
+                         cairo_region_t *region)
+{
+  int n_rects, i;
+  XRectangle *rects;
+  XserverRegion xregion;
+
+  n_rects = cairo_region_num_rectangles (region);
+  rects = g_new (XRectangle, n_rects);
+
+  for (i = 0; i < n_rects; i++)
+    {
+      cairo_rectangle_int_t rect;
+
+      cairo_region_get_rectangle (region, i, &rect);
+
+      rects[i].x = rect.x;
+      rects[i].y = rect.y;
+      rects[i].width = rect.width;
+      rects[i].height = rect.height;
+    }
+
+  xregion = XFixesCreateRegion (xdisplay, rects, n_rects);
+  g_free (rects);
+
+  return xregion;
+}
+
+static XserverRegion
 border_size (MetaCompWindow *cw)
 {
   MetaScreen *screen = cw->screen;
   MetaDisplay *display = meta_screen_get_display (screen);
   Display *xdisplay = meta_display_get_xdisplay (display);
+  cairo_region_t *visible_region;
+  XserverRegion visible = None;
   XserverRegion border;
 
+  if (cw->window)
+    {
+      visible_region = meta_window_get_frame_bounds (cw->window);
+
+      if (visible_region)
+        visible = cairo_region_to_xregion (xdisplay, visible_region);
+    }
+
   meta_error_trap_push (display);
   border = XFixesCreateRegionFromWindow (xdisplay, cw->id,
                                          WindowRegionBounding);
@@ -1095,6 +1134,19 @@ border_size (MetaCompWindow *cw)
   XFixesTranslateRegion (xdisplay, border,
                          cw->attrs.x + cw->attrs.border_width,
                          cw->attrs.y + cw->attrs.border_width);
+
+  if (visible != None)
+    {
+      XFixesTranslateRegion (xdisplay, visible,
+                         cw->attrs.x + cw->attrs.border_width,
+                         cw->attrs.y + cw->attrs.border_width);
+
+      XFixesIntersectRegion (xdisplay, visible, visible, border);
+      XFixesDestroyRegion (xdisplay, border);
+
+      return visible;
+    }
+
   return border;
 }