qskinny/src/common/QskRgbPalette.cpp

/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 * This file may be used under the terms of the QSkinny License, Version 1.0
 *****************************************************************************/

#include "QskRgbPalette.h"
#include "QskRgbValue.h"
#include "QskGradient.h"

#define RGB( color, weight ) color ## weight

#define RGBTABLE( c ) \
{ \
    RGB( c, 50 ),  RGB( c, 100 ), RGB( c, 200 ), RGB( c, 300 ), RGB( c, 400 ), \
    RGB( c, 500 ), RGB( c, 600 ), RGB( c, 700 ), RGB( c, 800 ), RGB( c, 900 )  \
}

namespace
{
    class Palette : public QskRgbPalette
    {
      public:
        Palette( int index )
        {
            using namespace QskRgbValue;

            static constexpr QRgb table[][ Palette::NumWeights ] =
            {
                RGBTABLE( Red ),
                RGBTABLE( Pink ),
                RGBTABLE( Purple ),
                RGBTABLE( DeepPurple ),
                RGBTABLE( Indigo ),
                RGBTABLE( Blue ),
                RGBTABLE( LightBlue ),
                RGBTABLE( Cyan ),
                RGBTABLE( Teal ),
                RGBTABLE( Green ),
                RGBTABLE( LightGreen ),
                RGBTABLE( Lime ),
                RGBTABLE( Yellow ),
                RGBTABLE( Amber ),
                RGBTABLE( Orange ),
                RGBTABLE( DeepOrange ),
                RGBTABLE( Brown ),
                RGBTABLE( Grey ),
                RGBTABLE( BlueGrey ),
            };

            const int count = sizeof( table ) / sizeof( table[ 0 ] );
            m_rgb = table[ qBound( 0, index, count ) ];
        }
    };
}

QskRgbPalette QskRgbPalette::palette( Theme theme )
{
    return Palette( static_cast< int >( theme ) );
}

static QVector< QskGradientStop > qskColorStops(
    const QRgb* rgb, int count, bool discrete )
{
    QVector< QskGradientStop > stops;

    if ( discrete )
        stops.reserve( 2 * count - 2 );
    else
        stops.reserve( count );

    stops += QskGradientStop( 0.0, rgb[0] );

    if ( discrete )
    {
        const auto step = 1.0 / count;

        for ( int i = 1; i < count; i++ )
        {
            const qreal pos = i * step;
            stops += QskGradientStop( pos, rgb[i-1] );
            stops += QskGradientStop( pos, rgb[i] );
        }
    }
    else
    {
        const auto step = 1.0 / ( count - 1 );

        for ( int i = 1; i < count - 1; i++ )
            stops += QskGradientStop( i * step, rgb[i] );
    }

    stops += QskGradientStop( 1.0, rgb[count - 1] );

    return stops;
}

QVector< QskGradientStop > QskRgbPalette::colorStops( bool discrete ) const
{
    return qskColorStops( m_rgb, NumWeights, discrete );
}

QVector< QskGradientStop > QskRgbPalette::colorStops( Theme theme, bool discrete )
{
    const auto pal = QskRgbPalette::palette( theme );
    return pal.colorStops( discrete );
}

QVector< QskGradientStop > QskRgbPalette::colorStops(
    const QVector< QRgb >& rgb, bool discrete )
{
    const int count = rgb.count();

    if ( count == 0 )
        return QVector< QskGradientStop >();

    if ( count == 0 )
    {
        QVector< QskGradientStop > stops;
        stops.reserve( 2 );

        stops += QskGradientStop( 0.0, rgb[0] );
        stops += QskGradientStop( 1.0, rgb[0] );

        return stops;
    }

    return qskColorStops( rgb.constData(), count, discrete );
}

#include "moc_QskRgbPalette.cpp"