ui/gfx/geometry/safe_integer_conversions_unittest.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gfx/geometry/safe_integer_conversions.h"
   6
   7 #include <limits>
   8
   9 #include "testing/gtest/include/gtest/gtest.h"
  10
  11 namespace gfx {
  12
  13 TEST(SafeIntegerConversions, ToFlooredInt) {
  14   float max = std::numeric_limits<int>::max();
  15   float min = std::numeric_limits<int>::min();
  16   float infinity = std::numeric_limits<float>::infinity();
  17
  18   int int_max = std::numeric_limits<int>::max();
  19   int int_min = std::numeric_limits<int>::min();
  20
  21   EXPECT_EQ(int_max, ToFlooredInt(infinity));
  22   EXPECT_EQ(int_max, ToFlooredInt(max));
  23   EXPECT_EQ(int_max, ToFlooredInt(max + 100));
  24
  25   EXPECT_EQ(-101, ToFlooredInt(-100.5f));
  26   EXPECT_EQ(0, ToFlooredInt(0.f));
  27   EXPECT_EQ(100, ToFlooredInt(100.5f));
  28
  29   EXPECT_EQ(int_min, ToFlooredInt(-infinity));
  30   EXPECT_EQ(int_min, ToFlooredInt(min));
  31   EXPECT_EQ(int_min, ToFlooredInt(min - 100));
  32 }
  33
  34 TEST(SafeIntegerConversions, ToCeiledInt) {
  35   float max = std::numeric_limits<int>::max();
  36   float min = std::numeric_limits<int>::min();
  37   float infinity = std::numeric_limits<float>::infinity();
  38
  39   int int_max = std::numeric_limits<int>::max();
  40   int int_min = std::numeric_limits<int>::min();
  41
  42   EXPECT_EQ(int_max, ToCeiledInt(infinity));
  43   EXPECT_EQ(int_max, ToCeiledInt(max));
  44   EXPECT_EQ(int_max, ToCeiledInt(max + 100));
  45
  46   EXPECT_EQ(-100, ToCeiledInt(-100.5f));
  47   EXPECT_EQ(0, ToCeiledInt(0.f));
  48   EXPECT_EQ(101, ToCeiledInt(100.5f));
  49
  50   EXPECT_EQ(int_min, ToCeiledInt(-infinity));
  51   EXPECT_EQ(int_min, ToCeiledInt(min));
  52   EXPECT_EQ(int_min, ToCeiledInt(min - 100));
  53 }
  54
  55 TEST(SafeIntegerConversions, ToRoundedInt) {
  56   float max = std::numeric_limits<int>::max();
  57   float min = std::numeric_limits<int>::min();
  58   float infinity = std::numeric_limits<float>::infinity();
  59
  60   int int_max = std::numeric_limits<int>::max();
  61   int int_min = std::numeric_limits<int>::min();
  62
  63   EXPECT_EQ(int_max, ToRoundedInt(infinity));
  64   EXPECT_EQ(int_max, ToRoundedInt(max));
  65   EXPECT_EQ(int_max, ToRoundedInt(max + 100));
  66
  67   EXPECT_EQ(-100, ToRoundedInt(-100.1f));
  68   EXPECT_EQ(-101, ToRoundedInt(-100.5f));
  69   EXPECT_EQ(-101, ToRoundedInt(-100.9f));
  70   EXPECT_EQ(0, ToRoundedInt(0.f));
  71   EXPECT_EQ(100, ToRoundedInt(100.1f));
  72   EXPECT_EQ(101, ToRoundedInt(100.5f));
  73   EXPECT_EQ(101, ToRoundedInt(100.9f));
  74
  75   EXPECT_EQ(int_min, ToRoundedInt(-infinity));
  76   EXPECT_EQ(int_min, ToRoundedInt(min));
  77   EXPECT_EQ(int_min, ToRoundedInt(min - 100));
  78 }
  79
  80 }  // namespace gfx