Gtk: Make click target of tabs match their appearance.

chrome/browser/ui/tabs/tab_resources.cc

+// Copyright (c) 2011 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 "chrome/browser/ui/tabs/tab_resources.h"
+
+#include "base/logging.h"
+#include "ui/gfx/path.h"
+
+namespace {
+
+// Hit mask constants.
+const SkScalar kTabCapWidth = 15;
+const SkScalar kTabTopCurveWidth = 4;
+const SkScalar kTabBottomCurveWidth = 3;
+
+}  // namespace
+
+// static
+void TabResources::GetHitTestMask(int width, int height, gfx::Path* path) {
+  DCHECK(path);
+
+  SkScalar h = SkIntToScalar(height);
+  SkScalar w = SkIntToScalar(width);
+
+  path->moveTo(0, h);
+
+  // Left end cap.
+  path->lineTo(kTabBottomCurveWidth, h - kTabBottomCurveWidth);
+  path->lineTo(kTabCapWidth - kTabTopCurveWidth, kTabTopCurveWidth);
+  path->lineTo(kTabCapWidth, 0);
+
+  // Connect to the right cap.
+  path->lineTo(w - kTabCapWidth, 0);
+
+  // Right end cap.
+  path->lineTo(w - kTabCapWidth + kTabTopCurveWidth, kTabTopCurveWidth);
+  path->lineTo(w - kTabBottomCurveWidth, h - kTabBottomCurveWidth);
+  path->lineTo(w, h);
+
+  // Close out the path.
+  path->lineTo(0, h);
+  path->close();
+}