ui: Add IsExpressibleAsRect() method to RectF

ui/gfx/rect_unittest.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 "base/basictypes.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_conversions.h"
 #include "ui/gfx/skia_util.h"
 
@@ skipping 653 matching lines @@
     { gfx::PointF(-4.2f, 6.8f), gfx::PointF(6.8f, -4.2f),
       gfx::RectF(-4.2f, -4.2f, 11.0f, 11.0f) }
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(float_tests); ++i) {
     gfx::RectF actual = BoundingRect(float_tests[i].a, float_tests[i].b);
     EXPECT_EQ(float_tests[i].expected.ToString(), actual.ToString());
   }
 }
 
+TEST(RectTest, IsExpressibleAsRect) {
+  //EXPECT_TRUE(gfx::RectF().IsExpressibleAsRect());
+
+  float min = std::numeric_limits<int>::min();
+  float max = std::numeric_limits<int>::max();
+  float infinity = std::numeric_limits<float>::infinity();
+
+  EXPECT_TRUE(gfx::RectF(min, min, max, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(min + 200, min, max, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(min, min + 200, max, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(min - 200, min, max, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(min, min - 200, max, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(min, min, max - 200, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(min, min, max, max - 200).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(min, min, max + 200, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(min, min, max, max + 200).IsExpressibleAsRect());
+
+  EXPECT_TRUE(gfx::RectF(0, 0, max, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(200, 0, max, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, 200, max, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(0, 0, max - 200, max).IsExpressibleAsRect());
+  EXPECT_TRUE(gfx::RectF(0, 0, max, max - 200).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, 0, max + 200, max).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, 0, max, max + 200).IsExpressibleAsRect());
+
+  EXPECT_FALSE(gfx::RectF(infinity, 0, 1, 1).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, infinity, 1, 1).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, 0, infinity, 1).IsExpressibleAsRect());
+  EXPECT_FALSE(gfx::RectF(0, 0, 1, infinity).IsExpressibleAsRect());
+}
+
 }  // namespace ui