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AK: Add FixedPoint arithmetic helper

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Co-authored-by: Hendiadyoin1 <leon2002.la@gmail.com>
Co-authored-by: kleines Filmröllchen <malu.bertsch@gmail.com>
This commit is contained in:
Hediadyoin1 2021-08-20 17:35:03 +02:00 • committed by Ali Mohammad Pur
parent beb8c48f26
commit fdef6e5f76
3 changed files with 409 additions and 0 deletions
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74
Tests/AK/TestFixedPoint.cpp Normal file
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/*
* Copyright (c) 2021, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/FixedPoint.h>
using Type = FixedPoint<4>;
TEST_CASE(arithmetic)
{
EXPECT_EQ(
Type(0.5) + Type(0.5),
Type(1));
EXPECT_EQ(
Type(1) + Type(0.5),
Type(1.5));
EXPECT_EQ(
(float)(Type(1) + Type(0.5)),
1.5f);
// FIXME: Test for rounded multiply
EXPECT_EQ(
Type((int)1) * Type(0.5),
Type(0.5));
EXPECT_EQ(
Type((int)1) / Type(0.5),
Type(2));
}
TEST_CASE(rounding)
{
EXPECT_EQ(Type(0.5).round(), Type(0));
EXPECT_EQ(Type(0.5).floor(), Type(0));
EXPECT_EQ(Type(0.5).ceil(), Type(1));
EXPECT_EQ(Type(0.75).trunk(), Type(0));
EXPECT_EQ(Type(1.5).round(), Type(2));
EXPECT_EQ(Type(1.5).floor(), Type(1));
EXPECT_EQ(Type(1.5).ceil(), Type(2));
EXPECT_EQ(Type(1.25).trunk(), Type(1));
EXPECT_EQ(Type(-0.5).round(), Type(0));
EXPECT_EQ(Type(-0.5).floor(), Type(-1));
EXPECT_EQ(Type(-0.5).ceil(), Type(0));
EXPECT_EQ(Type(-0.75).trunk(), Type(0));
EXPECT_EQ(Type(-1.5).round(), Type(-2));
EXPECT_EQ(Type(-1.5).floor(), Type(-2));
EXPECT_EQ(Type(-1.5).ceil(), Type(-1));
EXPECT_EQ(Type(-1.25).trunk(), Type(-1));
EXPECT_EQ(Type(0.5).lround(), 0);
EXPECT_EQ(Type(0.5).lfloor(), 0);
EXPECT_EQ(Type(0.5).lceil(), 1);
EXPECT_EQ(Type(0.5).ltrunk(), 0);
EXPECT_EQ(Type(1.5).lround(), 2);
EXPECT_EQ(Type(1.5).lfloor(), 1);
EXPECT_EQ(Type(1.5).lceil(), 2);
EXPECT_EQ(Type(1.5).ltrunk(), 1);
EXPECT_EQ(Type(-0.5).lround(), 0);
EXPECT_EQ(Type(-0.5).lfloor(), -1);
EXPECT_EQ(Type(-0.5).lceil(), 0);
EXPECT_EQ(Type(-0.5).ltrunk(), 0);
EXPECT_EQ(Type(-1.5).lround(), -2);
EXPECT_EQ(Type(-1.5).lfloor(), -2);
EXPECT_EQ(Type(-1.5).lceil(), -1);
EXPECT_EQ(Type(-1.5).ltrunk(), -1);
}