peranger/qskinny
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

qskFuzzyFloor/Ceil improved

Browse Source
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/common/QskFunctions.cpp
View File

@ -196,25 +196,18 @@ QRect qskPlatformScreenGeometry( const QScreen* screen )
return screen->handle()->geometry(); 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 qskFuzzyFloor( qreal value, qreal stepSize )
{ {
qreal v = std::floor( value / stepSize ) * stepSize; const double eps = 1.0e-6 * stepSize;
if ( qFuzzyCompare( value - v, stepSize ) )
v = value;
return v; value = ( value + eps ) / stepSize;
return std::floor( value ) * stepSize;
} }
qreal qskFuzzyCeil( qreal value, qreal stepSize ) qreal qskFuzzyCeil( qreal value, qreal stepSize )
{ {
qreal v = std::ceil( value / stepSize ) * stepSize; const double eps = 1.0e-6 * stepSize;
if ( qFuzzyCompare( v - value, stepSize ) )
v = value;
return v; value = ( value - eps ) / stepSize;
return std::ceil( value ) * stepSize;
} }