ui/gfx/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/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, ClampToInt) {
  14   EXPECT_EQ(0, ClampToInt(std::numeric_limits<float>::quiet_NaN()));
  15
  16   float max = std::numeric_limits<int>::max();
  17   float min = std::numeric_limits<int>::min();
  18   float infinity = std::numeric_limits<float>::infinity();
  19
  20   int int_max = std::numeric_limits<int>::max();
  21   int int_min = std::numeric_limits<int>::min();
  22
  23   EXPECT_EQ(int_max, ClampToInt(infinity));
  24   EXPECT_EQ(int_max, ClampToInt(max));
  25   EXPECT_EQ(int_max, ClampToInt(max + 100));
  26
  27   EXPECT_EQ(-100, ClampToInt(-100.5f));
  28   EXPECT_EQ(0, ClampToInt(0));
  29   EXPECT_EQ(100, ClampToInt(100.5f));
  30
  31   EXPECT_EQ(int_min, ClampToInt(-infinity));
  32   EXPECT_EQ(int_min, ClampToInt(min));
  33   EXPECT_EQ(int_min, ClampToInt(min - 100));
  34 }
  35
  36 TEST(SafeIntegerConversions, ToFlooredInt) {
  37   EXPECT_EQ(0, ToFlooredInt(std::numeric_limits<float>::quiet_NaN()));
  38
  39   float max = std::numeric_limits<int>::max();
  40   float min = std::numeric_limits<int>::min();
  41   float infinity = std::numeric_limits<float>::infinity();
  42
  43   int int_max = std::numeric_limits<int>::max();
  44   int int_min = std::numeric_limits<int>::min();
  45
  46   EXPECT_EQ(int_max, ToFlooredInt(infinity));
  47   EXPECT_EQ(int_max, ToFlooredInt(max));
  48   EXPECT_EQ(int_max, ToFlooredInt(max + 100));
  49
  50   EXPECT_EQ(-101, ToFlooredInt(-100.5f));
  51   EXPECT_EQ(0, ToFlooredInt(0));
  52   EXPECT_EQ(100, ToFlooredInt(100.5f));
  53
  54   EXPECT_EQ(int_min, ToFlooredInt(-infinity));
  55   EXPECT_EQ(int_min, ToFlooredInt(min));
  56   EXPECT_EQ(int_min, ToFlooredInt(min - 100));
  57 }
  58
  59 TEST(SafeIntegerConversions, ToCeiledInt) {
  60   EXPECT_EQ(0, ToCeiledInt(std::numeric_limits<float>::quiet_NaN()));
  61
  62   float max = std::numeric_limits<int>::max();
  63   float min = std::numeric_limits<int>::min();
  64   float infinity = std::numeric_limits<float>::infinity();
  65
  66   int int_max = std::numeric_limits<int>::max();
  67   int int_min = std::numeric_limits<int>::min();
  68
  69   EXPECT_EQ(int_max, ToCeiledInt(infinity));
  70   EXPECT_EQ(int_max, ToCeiledInt(max));
  71   EXPECT_EQ(int_max, ToCeiledInt(max + 100));
  72
  73   EXPECT_EQ(-100, ToCeiledInt(-100.5f));
  74   EXPECT_EQ(0, ToCeiledInt(0));
  75   EXPECT_EQ(101, ToCeiledInt(100.5f));
  76
  77   EXPECT_EQ(int_min, ToCeiledInt(-infinity));
  78   EXPECT_EQ(int_min, ToCeiledInt(min));
  79   EXPECT_EQ(int_min, ToCeiledInt(min - 100));
  80 }
  81
  82 TEST(SafeIntegerConversions, ToRoundedInt) {
  83   EXPECT_EQ(0, ToRoundedInt(std::numeric_limits<float>::quiet_NaN()));
  84
  85   float max = std::numeric_limits<int>::max();
  86   float min = std::numeric_limits<int>::min();
  87   float infinity = std::numeric_limits<float>::infinity();
  88
  89   int int_max = std::numeric_limits<int>::max();
  90   int int_min = std::numeric_limits<int>::min();
  91
  92   EXPECT_EQ(int_max, ToRoundedInt(infinity));
  93   EXPECT_EQ(int_max, ToRoundedInt(max));
  94   EXPECT_EQ(int_max, ToRoundedInt(max + 100));
  95
  96   EXPECT_EQ(-100, ToRoundedInt(-100.1f));
  97   EXPECT_EQ(-101, ToRoundedInt(-100.5f));
  98   EXPECT_EQ(-101, ToRoundedInt(-100.9f));
  99   EXPECT_EQ(0, ToRoundedInt(0));
 100   EXPECT_EQ(100, ToRoundedInt(100.1f));
 101   EXPECT_EQ(101, ToRoundedInt(100.5f));
 102   EXPECT_EQ(101, ToRoundedInt(100.9f));
 103
 104   EXPECT_EQ(int_min, ToRoundedInt(-infinity));
 105   EXPECT_EQ(int_min, ToRoundedInt(min));
 106   EXPECT_EQ(int_min, ToRoundedInt(min - 100));
 107 }
 108
 109 }  // namespace gfx