third_party/WebKit/Source/platform/LayoutUnitTest.cpp

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#include "platform/LayoutUnit.h"

#include "testing/gtest/include/gtest/gtest.h"
#include <limits.h>

namespace blink {

TEST(LayoutUnitTest, LayoutUnitInt) {
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(INT_MIN).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(INT_MIN / 2).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(kIntMinForLayoutUnit - 1).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(kIntMinForLayoutUnit).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit + 1,
            LayoutUnit(kIntMinForLayoutUnit + 1).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit / 2,
            LayoutUnit(kIntMinForLayoutUnit / 2).ToInt());
  EXPECT_EQ(-10000, LayoutUnit(-10000).ToInt());
  EXPECT_EQ(-1000, LayoutUnit(-1000).ToInt());
  EXPECT_EQ(-100, LayoutUnit(-100).ToInt());
  EXPECT_EQ(-10, LayoutUnit(-10).ToInt());
  EXPECT_EQ(-1, LayoutUnit(-1).ToInt());
  EXPECT_EQ(0, LayoutUnit(0).ToInt());
  EXPECT_EQ(1, LayoutUnit(1).ToInt());
  EXPECT_EQ(100, LayoutUnit(100).ToInt());
  EXPECT_EQ(1000, LayoutUnit(1000).ToInt());
  EXPECT_EQ(10000, LayoutUnit(10000).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit / 2,
            LayoutUnit(kIntMaxForLayoutUnit / 2).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit - 1,
            LayoutUnit(kIntMaxForLayoutUnit - 1).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(kIntMaxForLayoutUnit).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(kIntMaxForLayoutUnit + 1).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(INT_MAX / 2).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(INT_MAX).ToInt());
}

TEST(LayoutUnitTest, LayoutUnitFloat) {
  const float kTolerance = 1.0f / kFixedPointDenominator;
  EXPECT_FLOAT_EQ(1.0f, LayoutUnit(1.0f).ToFloat());
  EXPECT_FLOAT_EQ(1.25f, LayoutUnit(1.25f).ToFloat());
  EXPECT_NEAR(LayoutUnit(1.1f).ToFloat(), 1.1f, kTolerance);
  EXPECT_NEAR(LayoutUnit(1.33f).ToFloat(), 1.33f, kTolerance);
  EXPECT_NEAR(LayoutUnit(1.3333f).ToFloat(), 1.3333f, kTolerance);
  EXPECT_NEAR(LayoutUnit(1.53434f).ToFloat(), 1.53434f, kTolerance);
  EXPECT_NEAR(LayoutUnit(345634).ToFloat(), 345634.0f, kTolerance);
  EXPECT_NEAR(LayoutUnit(345634.12335f).ToFloat(), 345634.12335f, kTolerance);
  EXPECT_NEAR(LayoutUnit(-345634.12335f).ToFloat(), -345634.12335f, kTolerance);
  EXPECT_NEAR(LayoutUnit(-345634).ToFloat(), -345634.0f, kTolerance);
}

TEST(LayoutUnitTest, LayoutUnitRounding) {
  EXPECT_EQ(-2, LayoutUnit(-1.9f).Round());
  EXPECT_EQ(-2, LayoutUnit(-1.6f).Round());
  EXPECT_EQ(-2, LayoutUnit::FromFloatRound(-1.51f).Round());
  EXPECT_EQ(-1, LayoutUnit::FromFloatRound(-1.5f).Round());
  EXPECT_EQ(-1, LayoutUnit::FromFloatRound(-1.49f).Round());
  EXPECT_EQ(-1, LayoutUnit(-1.0f).Round());
  EXPECT_EQ(-1, LayoutUnit::FromFloatRound(-0.99f).Round());
  EXPECT_EQ(-1, LayoutUnit::FromFloatRound(-0.51f).Round());
  EXPECT_EQ(0, LayoutUnit::FromFloatRound(-0.50f).Round());
  EXPECT_EQ(0, LayoutUnit::FromFloatRound(-0.49f).Round());
  EXPECT_EQ(0, LayoutUnit(-0.1f).Round());
  EXPECT_EQ(0, LayoutUnit(0.0f).Round());
  EXPECT_EQ(0, LayoutUnit(0.1f).Round());
  EXPECT_EQ(0, LayoutUnit::FromFloatRound(0.49f).Round());
  EXPECT_EQ(1, LayoutUnit::FromFloatRound(0.50f).Round());
  EXPECT_EQ(1, LayoutUnit::FromFloatRound(0.51f).Round());
  EXPECT_EQ(1, LayoutUnit(0.99f).Round());
  EXPECT_EQ(1, LayoutUnit(1.0f).Round());
  EXPECT_EQ(1, LayoutUnit::FromFloatRound(1.49f).Round());
  EXPECT_EQ(2, LayoutUnit::FromFloatRound(1.5f).Round());
  EXPECT_EQ(2, LayoutUnit::FromFloatRound(1.51f).Round());
  // The fractional part of LayoutUnit::Max() is 0x3f, so it should round up.
  EXPECT_EQ(((std::numeric_limits<int>::max() / kFixedPointDenominator) + 1),
            LayoutUnit::Max().Round());
  // The fractional part of LayoutUnit::Min() is 0, so the next bigger possible
  // value should round down.
  LayoutUnit epsilon;
  epsilon.SetRawValue(1);
  EXPECT_EQ(((std::numeric_limits<int>::min() / kFixedPointDenominator)),
            (LayoutUnit::Min() + epsilon).Round());
}

TEST(LayoutUnitTest, LayoutUnitSnapSizeToPixel) {
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1), LayoutUnit(0)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1), LayoutUnit(0.5)));
  EXPECT_EQ(2, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0)));
  EXPECT_EQ(2, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.49)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.5)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.75)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(0.99)));
  EXPECT_EQ(2, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(1)));

  EXPECT_EQ(0, SnapSizeToPixel(LayoutUnit(0.5), LayoutUnit(1.5)));
  EXPECT_EQ(0, SnapSizeToPixel(LayoutUnit(0.99), LayoutUnit(1.5)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.0), LayoutUnit(1.5)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.49), LayoutUnit(1.5)));
  EXPECT_EQ(1, SnapSizeToPixel(LayoutUnit(1.5), LayoutUnit(1.5)));

  EXPECT_EQ(101, SnapSizeToPixel(LayoutUnit(100.5), LayoutUnit(100)));
  EXPECT_EQ(kIntMaxForLayoutUnit,
            SnapSizeToPixel(LayoutUnit(kIntMaxForLayoutUnit), LayoutUnit(0.3)));
  EXPECT_EQ(
      kIntMinForLayoutUnit,
      SnapSizeToPixel(LayoutUnit(kIntMinForLayoutUnit), LayoutUnit(-0.3)));
}

TEST(LayoutUnitTest, LayoutUnitMultiplication) {
  EXPECT_EQ(1, (LayoutUnit(1) * LayoutUnit(1)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(1) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(2) * LayoutUnit(1)).ToInt());
  EXPECT_EQ(1, (LayoutUnit(2) * LayoutUnit(0.5)).ToInt());
  EXPECT_EQ(1, (LayoutUnit(0.5) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(100, (LayoutUnit(100) * LayoutUnit(1)).ToInt());

  EXPECT_EQ(-1, (LayoutUnit(-1) * LayoutUnit(1)).ToInt());
  EXPECT_EQ(-2, (LayoutUnit(-1) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(-2, (LayoutUnit(-2) * LayoutUnit(1)).ToInt());
  EXPECT_EQ(-1, (LayoutUnit(-2) * LayoutUnit(0.5)).ToInt());
  EXPECT_EQ(-1, (LayoutUnit(-0.5) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(-100, (LayoutUnit(-100) * LayoutUnit(1)).ToInt());

  EXPECT_EQ(1, (LayoutUnit(-1) * LayoutUnit(-1)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(-1) * LayoutUnit(-2)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(-2) * LayoutUnit(-1)).ToInt());
  EXPECT_EQ(1, (LayoutUnit(-2) * LayoutUnit(-0.5)).ToInt());
  EXPECT_EQ(1, (LayoutUnit(-0.5) * LayoutUnit(-2)).ToInt());
  EXPECT_EQ(100, (LayoutUnit(-100) * LayoutUnit(-1)).ToInt());

  EXPECT_EQ(333, (LayoutUnit(100) * LayoutUnit(3.33)).Round());
  EXPECT_EQ(-333, (LayoutUnit(-100) * LayoutUnit(3.33)).Round());
  EXPECT_EQ(333, (LayoutUnit(-100) * LayoutUnit(-3.33)).Round());

  size_t a_hundred_size_t = 100;
  EXPECT_EQ(100, (LayoutUnit(a_hundred_size_t) * LayoutUnit(1)).ToInt());
  EXPECT_EQ(400, (a_hundred_size_t * LayoutUnit(4)).ToInt());
  EXPECT_EQ(400, (LayoutUnit(4) * a_hundred_size_t).ToInt());

  int quarter_max = kIntMaxForLayoutUnit / 4;
  EXPECT_EQ(quarter_max * 2, (LayoutUnit(quarter_max) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(quarter_max * 3, (LayoutUnit(quarter_max) * LayoutUnit(3)).ToInt());
  EXPECT_EQ(quarter_max * 4, (LayoutUnit(quarter_max) * LayoutUnit(4)).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (LayoutUnit(quarter_max) * LayoutUnit(5)).ToInt());

  size_t overflow_int_size_t = kIntMaxForLayoutUnit * 4;
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (LayoutUnit(overflow_int_size_t) * LayoutUnit(2)).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (overflow_int_size_t * LayoutUnit(4)).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (LayoutUnit(4) * overflow_int_size_t).ToInt());
}

TEST(LayoutUnitTest, LayoutUnitDivision) {
  EXPECT_EQ(1, (LayoutUnit(1) / LayoutUnit(1)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(1) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(2) / LayoutUnit(1)).ToInt());
  EXPECT_EQ(4, (LayoutUnit(2) / LayoutUnit(0.5)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(0.5) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(10, (LayoutUnit(100) / LayoutUnit(10)).ToInt());
  EXPECT_FLOAT_EQ(0.5f, (LayoutUnit(1) / LayoutUnit(2)).ToFloat());
  EXPECT_FLOAT_EQ(0.25f, (LayoutUnit(0.5) / LayoutUnit(2)).ToFloat());

  EXPECT_EQ(-1, (LayoutUnit(-1) / LayoutUnit(1)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(-1) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(-2, (LayoutUnit(-2) / LayoutUnit(1)).ToInt());
  EXPECT_EQ(-4, (LayoutUnit(-2) / LayoutUnit(0.5)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(-0.5) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(-10, (LayoutUnit(-100) / LayoutUnit(10)).ToInt());
  EXPECT_FLOAT_EQ(-0.5f, (LayoutUnit(-1) / LayoutUnit(2)).ToFloat());
  EXPECT_FLOAT_EQ(-0.25f, (LayoutUnit(-0.5) / LayoutUnit(2)).ToFloat());

  EXPECT_EQ(1, (LayoutUnit(-1) / LayoutUnit(-1)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(-1) / LayoutUnit(-2)).ToInt());
  EXPECT_EQ(2, (LayoutUnit(-2) / LayoutUnit(-1)).ToInt());
  EXPECT_EQ(4, (LayoutUnit(-2) / LayoutUnit(-0.5)).ToInt());
  EXPECT_EQ(0, (LayoutUnit(-0.5) / LayoutUnit(-2)).ToInt());
  EXPECT_EQ(10, (LayoutUnit(-100) / LayoutUnit(-10)).ToInt());
  EXPECT_FLOAT_EQ(0.5f, (LayoutUnit(-1) / LayoutUnit(-2)).ToFloat());
  EXPECT_FLOAT_EQ(0.25f, (LayoutUnit(-0.5) / LayoutUnit(-2)).ToFloat());

  size_t a_hundred_size_t = 100;
  EXPECT_EQ(50, (LayoutUnit(a_hundred_size_t) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(25, (a_hundred_size_t / LayoutUnit(4)).ToInt());
  EXPECT_EQ(4, (LayoutUnit(400) / a_hundred_size_t).ToInt());

  EXPECT_EQ(kIntMaxForLayoutUnit / 2,
            (LayoutUnit(kIntMaxForLayoutUnit) / LayoutUnit(2)).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (LayoutUnit(kIntMaxForLayoutUnit) / LayoutUnit(0.5)).ToInt());
}

TEST(LayoutUnitTest, LayoutUnitCeil) {
  EXPECT_EQ(0, LayoutUnit(0).Ceil());
  EXPECT_EQ(1, LayoutUnit(0.1).Ceil());
  EXPECT_EQ(1, LayoutUnit(0.5).Ceil());
  EXPECT_EQ(1, LayoutUnit(0.9).Ceil());
  EXPECT_EQ(1, LayoutUnit(1.0).Ceil());
  EXPECT_EQ(2, LayoutUnit(1.1).Ceil());

  EXPECT_EQ(0, LayoutUnit(-0.1).Ceil());
  EXPECT_EQ(0, LayoutUnit(-0.5).Ceil());
  EXPECT_EQ(0, LayoutUnit(-0.9).Ceil());
  EXPECT_EQ(-1, LayoutUnit(-1.0).Ceil());

  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(kIntMaxForLayoutUnit).Ceil());
  EXPECT_EQ(kIntMaxForLayoutUnit,
            (LayoutUnit(kIntMaxForLayoutUnit) - LayoutUnit(0.5)).Ceil());
  EXPECT_EQ(kIntMaxForLayoutUnit - 1,
            (LayoutUnit(kIntMaxForLayoutUnit) - LayoutUnit(1)).Ceil());

  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(kIntMinForLayoutUnit).Ceil());
}

TEST(LayoutUnitTest, LayoutUnitFloor) {
  EXPECT_EQ(0, LayoutUnit(0).Floor());
  EXPECT_EQ(0, LayoutUnit(0.1).Floor());
  EXPECT_EQ(0, LayoutUnit(0.5).Floor());
  EXPECT_EQ(0, LayoutUnit(0.9).Floor());
  EXPECT_EQ(1, LayoutUnit(1.0).Floor());
  EXPECT_EQ(1, LayoutUnit(1.1).Floor());

  EXPECT_EQ(-1, LayoutUnit(-0.1).Floor());
  EXPECT_EQ(-1, LayoutUnit(-0.5).Floor());
  EXPECT_EQ(-1, LayoutUnit(-0.9).Floor());
  EXPECT_EQ(-1, LayoutUnit(-1.0).Floor());

  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(kIntMaxForLayoutUnit).Floor());

  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(kIntMinForLayoutUnit).Floor());
  EXPECT_EQ(kIntMinForLayoutUnit,
            (LayoutUnit(kIntMinForLayoutUnit) + LayoutUnit(0.5)).Floor());
  EXPECT_EQ(kIntMinForLayoutUnit + 1,
            (LayoutUnit(kIntMinForLayoutUnit) + LayoutUnit(1)).Floor());
}

TEST(LayoutUnitTest, LayoutUnitFloatOverflow) {
  // These should overflow to the max/min according to their sign.
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(176972000.0f).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(-176972000.0f).ToInt());
  EXPECT_EQ(kIntMaxForLayoutUnit, LayoutUnit(176972000.0).ToInt());
  EXPECT_EQ(kIntMinForLayoutUnit, LayoutUnit(-176972000.0).ToInt());
}

TEST(LayoutUnitTest, UnaryMinus) {
  EXPECT_EQ(LayoutUnit(), -LayoutUnit());
  EXPECT_EQ(LayoutUnit(999), -LayoutUnit(-999));
  EXPECT_EQ(LayoutUnit(-999), -LayoutUnit(999));

  LayoutUnit negative_max;
  negative_max.SetRawValue(LayoutUnit::Min().RawValue() + 1);
  EXPECT_EQ(negative_max, -LayoutUnit::Max());
  EXPECT_EQ(LayoutUnit::Max(), -negative_max);

  // -LayoutUnit::min() is saturated to LayoutUnit::max()
  EXPECT_EQ(LayoutUnit::Max(), -LayoutUnit::Min());
}

}  // namespace blink