KoCompositeOpDestinationAtop< CS_Traits > Class Template Reference

#include <KoCompositeOpDestinationAtop.h>

Inheritance diagram for KoCompositeOpDestinationAtop< CS_Traits >:

Public Member Functions
	KoCompositeOpDestinationAtop (const KoColorSpace *cs)
Public Member Functions inherited from KoCompositeOpBase< CS_Traits, KoCompositeOpDestinationAtop< CS_Traits > >
void	composite (const KoCompositeOp::ParameterInfo &params) const override
virtual void	composite (const ParameterInfo &params) const
void	composite (quint8 *dstRowStart, qint32 dstRowStride, const quint8 *srcRowStart, qint32 srcRowStride, const quint8 *maskRowStart, qint32 maskRowStride, qint32 rows, qint32 numColumns, float opacity, const QBitArray &channelFlags=QBitArray()) const
	KoCompositeOpBase (const KoColorSpace *cs, const QString &id, const QString &category)
Public Member Functions inherited from KoCompositeOp
QString	category () const
const KoColorSpace *	colorSpace () const
void	composite (quint8 *dstRowStart, qint32 dstRowStride, const quint8 *srcRowStart, qint32 srcRowStride, const quint8 *maskRowStart, qint32 maskRowStride, qint32 rows, qint32 numColumns, float opacity, const QBitArray &channelFlags=QBitArray()) const
QString	description () const
QString	id () const
	KoCompositeOp (const KoColorSpace *cs, const QString &id, const QString &category=KoCompositeOp::categoryMisc())
virtual	~KoCompositeOp ()
Public Member Functions inherited from Private
	Private (KisCanvas2 *c)

Static Public Member Functions
template<bool alphaLocked, bool allChannelFlags>
static channels_type	composeColorChannels (const channels_type *src, channels_type srcAlpha, channels_type *dst, channels_type dstAlpha, channels_type maskAlpha, channels_type opacity, const QBitArray &channelFlags)
Static Public Member Functions inherited from KoCompositeOp
static QString	categoryArithmetic ()
static QString	categoryBinary ()
static QString	categoryDark ()
static QString	categoryHSI ()
static QString	categoryHSL ()
static QString	categoryHSV ()
static QString	categoryHSY ()
static QString	categoryLight ()
static QString	categoryMisc ()
static QString	categoryMix ()
static QString	categoryModulo ()
static QString	categoryNegative ()
static QString	categoryQuadratic ()

Private Types
typedef KoCompositeOpBase< CS_Traits, KoCompositeOpDestinationAtop< CS_Traits > >	base_class
typedef CS_Traits::channels_type	channels_type

Static Private Attributes
static const qint8	alpha_pos = CS_Traits::alpha_pos
static const qint8	channels_nb = CS_Traits::channels_nb

Additional Inherited Members
Public Attributes inherited from KoCompositeOp
QString	category
const KoColorSpace *	colorSpace
QBitArray	defaultChannelFlags
QString	description
QString	id
Public Attributes inherited from Private
KisCanvas2 *	canvas
int	displayedFrame
int	intendedFrame

Detailed Description

template<class CS_Traits>
class KoCompositeOpDestinationAtop< CS_Traits >

Generic implementation of the Destination-atop composite op, based off the behind composite op. This is necessary for Open Raster support. https://www.w3.org/TR/compositing-1/

Definition at line 19 of file KoCompositeOpDestinationAtop.h.

Member Typedef Documentation

base_class

template<class CS_Traits >

typedef KoCompositeOpBase<CS_Traits, KoCompositeOpDestinationAtop<CS_Traits> > KoCompositeOpDestinationAtop< CS_Traits >::base_class

private

Definition at line 21 of file KoCompositeOpDestinationAtop.h.

channels_type

template<class CS_Traits >

typedef CS_Traits::channels_type KoCompositeOpDestinationAtop< CS_Traits >::channels_type

private

Definition at line 22 of file KoCompositeOpDestinationAtop.h.

Constructor & Destructor Documentation

KoCompositeOpDestinationAtop()

template<class CS_Traits >

KoCompositeOpDestinationAtop< CS_Traits >::KoCompositeOpDestinationAtop ( const KoColorSpace * cs )

inline

Definition at line 28 of file KoCompositeOpDestinationAtop.h.

        : base_class(cs, COMPOSITE_DESTINATION_ATOP, KoCompositeOp::categoryMix()) { }

Member Function Documentation

composeColorChannels()

template<class CS_Traits >

template<bool alphaLocked, bool allChannelFlags>

static channels_type KoCompositeOpDestinationAtop< CS_Traits >::composeColorChannels ( const channels_type * src, channels_type srcAlpha, channels_type * dst, channels_type dstAlpha, channels_type maskAlpha, channels_type opacity, const QBitArray & channelFlags )

inlinestatic

Definition at line 33 of file KoCompositeOpDestinationAtop.h.

                                                                                                         {
        using namespace Arithmetic;
 
        channels_type appliedAlpha       = mul(maskAlpha, srcAlpha, opacity);
 
        channels_type newDstAlpha        = appliedAlpha;
 
        if (dstAlpha != zeroValue<channels_type>() && srcAlpha != zeroValue<channels_type>()) {
            // blend the color channels as if we were painting on the layer below
            for (qint8 channel = 0; channel < channels_nb; ++channel)
                if(channel != alpha_pos && (allChannelFlags || channelFlags.testBit(channel))) {
                    dst[channel] = lerp(src[channel],dst[channel],dstAlpha);
                }
        }
        else if (srcAlpha != zeroValue<channels_type>()) {
            // don't blend if the color of the destination is undefined (has zero opacity)
            // copy the source channel instead
            for (qint8 channel = 0; channel < channels_nb; ++channel)
                if(channel != alpha_pos && (allChannelFlags || channelFlags.testBit(channel)))
                    dst[channel] = src[channel];
        }
 
        return newDstAlpha;
    }

References KoCompositeOpDestinationAtop< CS_Traits >::alpha_pos, KoCompositeOpDestinationAtop< CS_Traits >::channels_nb, and lerp().

Member Data Documentation

alpha_pos

template<class CS_Traits >

const qint8 KoCompositeOpDestinationAtop< CS_Traits >::alpha_pos = CS_Traits::alpha_pos

staticprivate

Definition at line 25 of file KoCompositeOpDestinationAtop.h.

channels_nb

template<class CS_Traits >

const qint8 KoCompositeOpDestinationAtop< CS_Traits >::channels_nb = CS_Traits::channels_nb

staticprivate

Definition at line 24 of file KoCompositeOpDestinationAtop.h.

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The documentation for this class was generated from the following file:

• libs/pigment/compositeops/KoCompositeOpDestinationAtop.h