Mac: Optimize TabView drawing.

ui/base/cocoa/three_part_image_unittest.mm

Index: ui/base/cocoa/three_part_image_unittest.mm
diff --git a/ui/base/cocoa/three_part_image_unittest.mm b/ui/base/cocoa/three_part_image_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..43db298ec77203b61dc9fc4a19cf6ad088fc8627
--- /dev/null
+++ b/ui/base/cocoa/three_part_image_unittest.mm
@@ -0,0 +1,54 @@
+// Copyright 2015 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/base/cocoa/three_part_image.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "testing/gtest_mac.h"
+#import "ui/gfx/test/ui_cocoa_test_helper.h"
+#include "ui/resources/grit/ui_resources.h"
+
+namespace ui {
+namespace test {
+
+TEST(ThreePartImageTest, GetRects) {
+  ThreePartImage image(IDR_BROWSER_ACTION_BADGE_LEFT,
+                       IDR_BROWSER_ACTION_BADGE_CENTER,
+                       IDR_BROWSER_ACTION_BADGE_RIGHT);
+  NSRect bounds = NSMakeRect(0, 0, 20, 11);
+  EXPECT_NSRECT_EQ(NSMakeRect(0, 0, 4, 11), image.GetLeftRect(bounds));
+  EXPECT_NSRECT_EQ(NSMakeRect(4, 0, 12, 11), image.GetMiddleRect(bounds));
+  EXPECT_NSRECT_EQ(NSMakeRect(16, 0, 4, 11), image.GetRightRect(bounds));
+}
+
+TEST(ThreePartImageTest, GetRectsWithoutMiddle) {
+  ThreePartImage image(IDR_BROWSER_ACTION_BADGE_LEFT,
+                       0,
+                       IDR_BROWSER_ACTION_BADGE_RIGHT);
+  NSRect bounds = NSMakeRect(0, 0, 20, 11);
+  EXPECT_NSRECT_EQ(NSMakeRect(0, 0, 4, 11), image.GetLeftRect(bounds));
+  EXPECT_NSRECT_EQ(NSMakeRect(4, 0, 12, 11), image.GetMiddleRect(bounds));
+  EXPECT_NSRECT_EQ(NSMakeRect(16, 0, 4, 11), image.GetRightRect(bounds));
+}
+
+TEST(ThreePartImageTest, HitTest) {
+  ThreePartImage image(IDR_BACK_ARROW, 0, IDR_FORWARD_ARROW);
+  NSRect bounds = NSMakeRect(0, 0, 512, 128);
+
+  // The middle of the arrows are hits.
+  EXPECT_TRUE(image.HitTest(NSMakePoint(64, 64), bounds));
+  EXPECT_TRUE(image.HitTest(NSMakePoint(448, 64), bounds));
+
+  // No middle image means the middle rect is a hit.
+  EXPECT_TRUE(image.HitTest(NSMakePoint(256, 64), bounds));
+
+  // The corners are transparent.
+  EXPECT_FALSE(image.HitTest(NSMakePoint(0, 0), bounds));
+  EXPECT_FALSE(image.HitTest(NSMakePoint(0, 127), bounds));
+  EXPECT_FALSE(image.HitTest(NSMakePoint(511, 0), bounds));
+  EXPECT_FALSE(image.HitTest(NSMakePoint(511, 127), bounds));
+}
+
+}  // namespace test
+}  // namespace ui