mirror of
https://github.com/RGBCube/serenity
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f021baf255
Rather than casting the FixedPoint to double, format the FixedPoint directly. This avoids using floating point instruction, which in turn enables this to be used even in the kernel.
83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/FixedPoint.h>
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using Type = FixedPoint<4>;
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TEST_CASE(arithmetic)
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{
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EXPECT_EQ(
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Type(0.5) + Type(0.5),
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Type(1));
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EXPECT_EQ(
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Type(1) + Type(0.5),
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Type(1.5));
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EXPECT_EQ(
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(float)(Type(1) + Type(0.5)),
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1.5f);
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// FIXME: Test for rounded multiply
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EXPECT_EQ(
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Type((int)1) * Type(0.5),
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Type(0.5));
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EXPECT_EQ(
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Type((int)1) / Type(0.5),
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Type(2));
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}
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TEST_CASE(rounding)
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{
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EXPECT_EQ(Type(0.5).round(), Type(0));
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EXPECT_EQ(Type(0.5).floor(), Type(0));
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EXPECT_EQ(Type(0.5).ceil(), Type(1));
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EXPECT_EQ(Type(0.75).trunk(), Type(0));
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EXPECT_EQ(Type(1.5).round(), Type(2));
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EXPECT_EQ(Type(1.5).floor(), Type(1));
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EXPECT_EQ(Type(1.5).ceil(), Type(2));
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EXPECT_EQ(Type(1.25).trunk(), Type(1));
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EXPECT_EQ(Type(-0.5).round(), Type(0));
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EXPECT_EQ(Type(-0.5).floor(), Type(-1));
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EXPECT_EQ(Type(-0.5).ceil(), Type(0));
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EXPECT_EQ(Type(-0.75).trunk(), Type(0));
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EXPECT_EQ(Type(-1.5).round(), Type(-2));
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EXPECT_EQ(Type(-1.5).floor(), Type(-2));
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EXPECT_EQ(Type(-1.5).ceil(), Type(-1));
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EXPECT_EQ(Type(-1.25).trunk(), Type(-1));
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EXPECT_EQ(Type(0.5).lround(), 0);
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EXPECT_EQ(Type(0.5).lfloor(), 0);
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EXPECT_EQ(Type(0.5).lceil(), 1);
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EXPECT_EQ(Type(0.5).ltrunk(), 0);
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EXPECT_EQ(Type(1.5).lround(), 2);
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EXPECT_EQ(Type(1.5).lfloor(), 1);
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EXPECT_EQ(Type(1.5).lceil(), 2);
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EXPECT_EQ(Type(1.5).ltrunk(), 1);
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EXPECT_EQ(Type(-0.5).lround(), 0);
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EXPECT_EQ(Type(-0.5).lfloor(), -1);
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EXPECT_EQ(Type(-0.5).lceil(), 0);
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EXPECT_EQ(Type(-0.5).ltrunk(), 0);
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EXPECT_EQ(Type(-1.5).lround(), -2);
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EXPECT_EQ(Type(-1.5).lfloor(), -2);
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EXPECT_EQ(Type(-1.5).lceil(), -1);
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EXPECT_EQ(Type(-1.5).ltrunk(), -1);
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}
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TEST_CASE(formatter)
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{
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EXPECT_EQ(String::formatted("{}", FixedPoint<16>(123.456)), "123.455993"sv);
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EXPECT_EQ(String::formatted("{}", FixedPoint<16>(-123.456)), "-123.455994"sv);
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EXPECT_EQ(String::formatted("{}", FixedPoint<4>(123.456)), "123.4375"sv);
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EXPECT_EQ(String::formatted("{}", FixedPoint<4>(-123.456)), "-123.4375"sv);
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EXPECT_EQ(String::formatted("{}", FixedPoint<16> {}), "0"sv);
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}
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