KisLayerStyleKnockoutBlower.cpp

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/*
 *  SPDX-FileCopyrightText: 2019 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#include "KisLayerStyleKnockoutBlower.h"
 
#include "kis_painter.h"
#include "KoCompositeOpRegistry.h"
#include "kis_default_bounds.h"
#include "KisImageResolutionProxy.h"
 
 
KisLayerStyleKnockoutBlower::KisLayerStyleKnockoutBlower()
{
}
 
KisLayerStyleKnockoutBlower::KisLayerStyleKnockoutBlower(const KisLayerStyleKnockoutBlower &rhs)
    : m_knockoutSelection(rhs.m_knockoutSelection ? new KisSelection(*rhs.m_knockoutSelection) : nullptr)
{
}
 
KisSelectionSP KisLayerStyleKnockoutBlower::knockoutSelectionLazy()
{
    {
        QReadLocker l(&m_lock);
        if (m_knockoutSelection) {
            return m_knockoutSelection;
        }
    }
 
    {
        QWriteLocker l(&m_lock);
        if (m_knockoutSelection) {
            return m_knockoutSelection;
        } else {
            m_knockoutSelection = new KisSelection(new KisSelectionEmptyBounds(),
                                                   KisImageResolutionProxy::identity());
            return m_knockoutSelection;
        }
    }
}
 
void KisLayerStyleKnockoutBlower::setKnockoutSelection(KisSelectionSP selection)
{
    QWriteLocker l(&m_lock);
    m_knockoutSelection = selection;
}
 
void KisLayerStyleKnockoutBlower::resetKnockoutSelection()
{
    QWriteLocker l(&m_lock);
    m_knockoutSelection = 0;
}
 
void KisLayerStyleKnockoutBlower::apply(KisPainter *painter, KisPaintDeviceSP mergedStyle, const QRect &rect) const
{
    QReadLocker l(&m_lock);
 
    KIS_SAFE_ASSERT_RECOVER_NOOP(m_knockoutSelection);
 
    painter->setOpacityToUnit();
    painter->setChannelFlags(QBitArray());
    painter->setCompositeOpId(COMPOSITE_COPY);
    painter->setSelection(m_knockoutSelection);
    painter->bitBlt(rect.topLeft(), mergedStyle, rect);
    painter->setSelection(0);
}
 
bool KisLayerStyleKnockoutBlower::isEmpty() const
{
    QReadLocker l(&m_lock);
    return !m_knockoutSelection;
}