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AK: Change standard casting method of FixedPoint to truncation
This matches what floats do. Also fix typo `trunk`->`trunc`
This commit is contained in:
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8526791617
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05c959e40b
Notes:
sideshowbarker
2024-07-18 05:37:06 +09:00
Author: https://github.com/Hendiadyoin1 Commit: https://github.com/SerenityOS/serenity/commit/05c959e40b Pull-request: https://github.com/SerenityOS/serenity/pull/20163 Reviewed-by: https://github.com/DanShaders
@ -66,19 +66,7 @@ public:
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template<Integral I>
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explicit constexpr operator I() const
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{
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I value = m_value >> precision;
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// fract(m_value) >= .5?
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if (m_value & (1u << (precision - 1))) {
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// fract(m_value) > .5?
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if (m_value & (radix_mask >> 2u)) {
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// yes: round "up";
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value += (m_value > 0 ? 1 : -1);
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} else {
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// no: round to even;
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value += value & 1;
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}
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}
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return value;
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return trunc().raw() >> precision;
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}
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static constexpr This create_raw(Underlying value)
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@ -111,9 +99,23 @@ public:
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return *this;
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}
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// Note/FIXME: This uses round to nearest break-tie to even
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// Not break-tie away from 0 as the C99's round does
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constexpr This round() const
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{
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return This { static_cast<Underlying>(*this) };
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Underlying value = m_value >> precision;
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// fract(m_value) >= .5?
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if (m_value & (1u << (precision - 1))) {
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// fract(m_value) > .5?
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if (m_value & (radix_mask >> 2u)) {
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// yes: round "up";
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value += (m_value > 0 ? 1 : -1);
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} else {
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// no: round to even;
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value += value & 1;
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}
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}
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return value;
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}
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constexpr This floor() const
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{
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@ -124,7 +126,7 @@ public:
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return create_raw((m_value & ~radix_mask)
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+ (m_value & radix_mask ? 1 << precision : 0));
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}
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constexpr This trunk() const
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constexpr This trunc() const
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{
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return create_raw((m_value & ~radix_mask)
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+ ((m_value & radix_mask)
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@ -132,14 +134,14 @@ public:
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: 0));
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}
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constexpr Underlying lround() const { return static_cast<Underlying>(*this); }
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constexpr Underlying lround() const { return round().raw() >> precision; }
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constexpr Underlying lfloor() const { return m_value >> precision; }
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constexpr Underlying lceil() const
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{
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return (m_value >> precision)
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+ (m_value & radix_mask ? 1 : 0);
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}
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constexpr Underlying ltrunk() const
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constexpr Underlying ltrunc() const
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{
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return (m_value >> precision)
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+ ((m_value & radix_mask)
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@ -437,7 +439,7 @@ struct Formatter<FixedPoint<precision, Underlying>> : StandardFormatter {
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if constexpr (IsSigned<Underlying>)
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is_negative = value < 0;
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i64 integer = value.ltrunk();
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i64 integer = value.ltrunc();
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constexpr u64 one = static_cast<Underlying>(1) << precision;
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u64 fraction_raw = value.raw() & (one - 1);
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return builder.put_fixed_point(is_negative, integer, fraction_raw, one, base, upper_case, m_zero_pad, m_use_separator, m_align, m_width.value(), m_precision.value(), m_fill, m_sign_mode, real_number_display_mode);
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@ -41,42 +41,42 @@ TEST_CASE(rounding)
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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(0.75).trunc(), 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(1.25).trunc(), 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(-0.75).trunc(), 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(-1.25).trunc(), 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(0.5).ltrunc(), 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(1.5).ltrunc(), 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(-0.5).ltrunc(), 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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EXPECT_EQ(Type(-1.5).ltrunc(), -1);
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// Check that sRGB TRC curve parameters match the s15fixed16 values stored in Gimp's built-in profile.
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// (This only requires that the FixedPoint<> constructor rounds before truncating to the fixed-point value,
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@ -116,7 +116,7 @@ FixedPoint<16, u32> DMT::MonitorTiming::vertical_frequency_hz() const
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u32 DMT::MonitorTiming::refresh_rate_hz() const
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{
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return vertical_frequency_hz().ltrunk();
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return vertical_frequency_hz().ltrunc();
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}
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#ifndef KERNEL
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