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qskFuzzyFloor/Ceil improved

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This commit is contained in:
Uwe Rathmann 2021-07-14 13:29:46 +02:00
parent 14fc393775
commit c57924d7eb
1 changed files with 6 additions and 13 deletions
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19
src/common/QskFunctions.cpp
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@ -196,25 +196,18 @@ QRect qskPlatformScreenGeometry( const QScreen* screen )
return screen->handle()->geometry();
}
/*
Due to the nature of floating point arithmetic
we might floor a value, that is already "aligned"
F.e static_cast< int >( 0.29 / 0.01 ) -> 28
*/
qreal qskFuzzyFloor( qreal value, qreal stepSize )
{
qreal v = std::floor( value / stepSize ) * stepSize;
if ( qFuzzyCompare( value - v, stepSize ) )
v = value;
const double eps = 1.0e-6 * stepSize;
return v;
value = ( value + eps ) / stepSize;
return std::floor( value ) * stepSize;
}
qreal qskFuzzyCeil( qreal value, qreal stepSize )
{
qreal v = std::ceil( value / stepSize ) * stepSize;
if ( qFuzzyCompare( v - value, stepSize ) )
v = value;
const double eps = 1.0e-6 * stepSize;
return v;
value = ( value - eps ) / stepSize;
return std::ceil( value ) * stepSize;
}