Introduce the MaskedViewTargeter class

ui/views/masked_view_targeter.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/masked_view_targeter.h"
+
+#include "ui/gfx/path.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/views/view.h"
+
+namespace views {
+
+MaskedViewTargeter::MaskedViewTargeter(View* masked_view)
+    : masked_view_(masked_view) {
+}
+
+MaskedViewTargeter::~MaskedViewTargeter() {
+}
+
+bool MaskedViewTargeter::EventLocationInsideBounds(
+    ui::EventTarget* target,
+    const ui::LocatedEvent& event) const {
+  View* view = static_cast<View*>(target);
+  if (view == masked_view_) {
+    gfx::Path mask;
+    if (!GetHitTestMask(view, &mask))
+      return ViewTargeter::EventLocationInsideBounds(view, event);
+
+    gfx::Size size = view->bounds().size();
+    SkRegion clip_region;
+    clip_region.setRect(0, 0, size.width(), size.height());
+
+    gfx::RectF bounds_f = ViewTargeter::BoundsForEvent(event);
+    if (view->parent())
+      View::ConvertRectToTarget(view->parent(), view, &bounds_f);
+    gfx::Rect bounds = gfx::ToEnclosingRect(bounds_f);
+
+    SkRegion mask_region;
+    return mask_region.setPath(mask, clip_region) &&
+           mask_region.intersects(RectToSkIRect(bounds));
+  }
+
+  return ViewTargeter::EventLocationInsideBounds(view, event);
+}
+
+}  // namespace views