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qskExtractedGradientStops fixed (

Browse Source 
https://github.com/uwerat/qskinny/issues/374 )
This commit is contained in:
Uwe Rathmann 2024-02-01 10:02:49 +01:00
parent 59c2e8ca33
commit 2e34bfd4c6
1 changed files with 48 additions and 25 deletions
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55
src/common/QskGradientStop.cpp
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@ -293,44 +293,67 @@ QColor qskInterpolatedColorAt( const QskGradientStops& stops, qreal pos ) noexce
}
QskGradientStops qskExtractedGradientStops(
const QskGradientStops& stops, qreal from, qreal to )
const QskGradientStops& gradientStops, qreal from, qreal to )
{
if ( ( from > to ) || ( from > 1.0 ) || stops.isEmpty() )
if ( ( from > to ) || ( from > 1.0 ) || gradientStops.isEmpty() )
return QskGradientStops();
if ( ( from <= 0.0 ) && ( to >= 1.0 ) )
return stops;
return gradientStops;
from = qMax( from, 0.0 );
to = qMin( to, 1.0 );
QVector< QskGradientStop > extracted;
extracted.reserve( stops.count() );
QVector< QskGradientStop > stops1 = gradientStops;
#if 1
// not the most efficient implementation - maybe later TODO ...
if ( stops1.first().position() > 0.0 )
stops1.prepend( QskGradientStop( 0.0, stops1.first().color() ) );
if ( stops1.last().position() < 1.0 )
stops1.append( QskGradientStop( 1.0, stops1.last().color() ) );
#endif
QVector< QskGradientStop > stops2;
stops2.reserve( stops1.count() );
if ( stops1.count() == 2 )
{
const auto rgb1 = stops1.first().rgb();
const auto rgb2 = stops1.last().rgb();
stops2 += QskGradientStop( 0.0, QskRgb::interpolated( rgb1, rgb2, from ) );
stops2 += QskGradientStop( 1.0, QskRgb::interpolated( rgb1, rgb2, to ) );
}
else
{
int i = 0;
for ( ; i < stops.count(); i++ )
for ( ; i < stops1.count(); i++ )
{
if ( stops[i].position() > from )
if ( stops1[i].position() > from )
break;
}
extracted += QskGradientStop( 0.0,
qskInterpolatedColor( stops, i - 1, i, from ) );
stops2 += QskGradientStop( 0.0,
qskInterpolatedColor( stops1, i - 1, i, from ) );
for ( ; i < stops.count(); i++ )
for ( ; i < stops1.count(); i++ )
{
if ( stops[i].position() >= to )
if ( stops1[i].position() >= to )
break;
const auto pos = ( stops[i].position() - from ) / ( to - from );
extracted += QskGradientStop( pos, stops[i].color() );
const auto pos = ( stops1[i].position() - from ) / ( to - from );
stops2 += QskGradientStop( pos, stops1[i].color() );
}
extracted += QskGradientStop( 1.0,
qskInterpolatedColor( stops, i, i + 1, to ) );
stops2 += QskGradientStop( 1.0,
qskInterpolatedColor( stops1, i, i + 1, to ) );
}
return extracted;
return stops2;
}
QskGradientStops qskRevertedGradientStops( const QskGradientStops& stops )