Add unittests for null/empty window shapes

ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
 
 #include <algorithm>
 #include <vector>
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
@@ skipping 338 matching lines @@
 
   // Repeat test for an X window which does not belong to a views::Widget
   // because the code path is different.
   EXPECT_EQ(xid2, FindTopmostXWindowAt(305, 120));
   EXPECT_NE(xid1, FindTopmostXWindowAt(305, 105));
   EXPECT_NE(xid2, FindTopmostXWindowAt(305, 105));
 
   XDestroyWindow(xdisplay(), xid2);
 }
 
+// Test that a window with an empty shape are properly handled.
+TEST_F(X11TopmostWindowFinderTest, NonRectangularEmptyShape) {
+  if (!ui::IsShapeExtensionAvailable())
+    return;
+
+  scoped_ptr<Widget> widget1(
+      CreateAndShowWidget(gfx::Rect(100, 100, 100, 100)));
+  XID xid1 = widget1->GetNativeWindow()->GetHost()->GetAcceleratedWidget();
+  SkRegion* skregion1 = new SkRegion;
+  skregion1->op(SkIRect::MakeXYWH(0, 0, 0, 0), SkRegion::kUnion_Op);
+  // Widget takes ownership of |skregion1|.
+  widget1->SetShape(skregion1);
+
+  XID xids[] = { xid1 };
+  StackingClientListWaiter stack_waiter(xids, arraysize(xids));
+  stack_waiter.Wait();
+  ui::X11EventSource::GetInstance()->DispatchXEvents();
+
+  EXPECT_NE(xid1, FindTopmostXWindowAt(105, 105));
+}
+
+// Test that setting a Null shape removes the shape.
+TEST_F(X11TopmostWindowFinderTest, NonRectangularNullShape) {
+  if (!ui::IsShapeExtensionAvailable())
+    return;
+
+  scoped_ptr<Widget> widget1(
+      CreateAndShowWidget(gfx::Rect(100, 100, 100, 100)));
+  XID xid1 = widget1->GetNativeWindow()->GetHost()->GetAcceleratedWidget();
+  SkRegion* skregion1 = new SkRegion;
+  skregion1->op(SkIRect::MakeXYWH(0, 0, 0, 0), SkRegion::kUnion_Op);
+  // Widget takes ownership of |skregion1|.
+  widget1->SetShape(skregion1);
+
+  // Remove the shape - this is now just a normal window.
+  widget1->SetShape(NULL);
+
+  XID xids[] = { xid1 };
+  StackingClientListWaiter stack_waiter(xids, arraysize(xids));
+  stack_waiter.Wait();
+  ui::X11EventSource::GetInstance()->DispatchXEvents();
+
+  EXPECT_EQ(xid1, FindTopmostXWindowAt(105, 105));
+}
+
 // Test that the TopmostWindowFinder finds windows which belong to menus
 // (which may or may not belong to Chrome).
 TEST_F(X11TopmostWindowFinderTest, Menu) {
   XID xid = CreateAndShowXWindow(gfx::Rect(100, 100, 100, 100));
 
   XID root = DefaultRootWindow(xdisplay());
   XSetWindowAttributes swa;
   swa.override_redirect = True;
   XID menu_xid = XCreateWindow(xdisplay(),
                                root,
@@ skipping 23 matching lines @@
 
   EXPECT_EQ(xid, FindTopmostXWindowAt(110, 110));
   EXPECT_EQ(menu_xid, FindTopmostXWindowAt(150, 120));
   EXPECT_EQ(menu_xid, FindTopmostXWindowAt(210, 120));
 
   XDestroyWindow(xdisplay(), xid);
   XDestroyWindow(xdisplay(), menu_xid);
 }
 
 }  // namespace views