kis_layer_style_filter_environment.cpp

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/*
 *  SPDX-FileCopyrightText: 2015 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#include "kis_layer_style_filter_environment.h"
 
#include <QBitArray>
 
#include "kis_layer.h"
#include "kis_ls_utils.h"
 
#include "kis_selection.h"
#include "kis_pixel_selection.h"
#include "kis_painter.h"
#include "kis_image.h"
 
#include "krita_utils.h"
 
#include <boost/random/mersenne_twister.hpp>
#include "kis_random_accessor_ng.h"
#include "kis_iterator_ng.h"
#include "kis_cached_paint_device.h"
#include "KisLocalStrokeResources.h"
 
 
struct Q_DECL_HIDDEN KisLayerStyleFilterEnvironment::Private
{
    KisLayer *sourceLayer;
    KisPixelSelectionSP cachedRandomSelection;
    KisCachedSelection globalCachedSelection;
    KisCachedPaintDevice globalCachedPaintDevice;
    KisLocalStrokeResources cachedFlattenedPattern;
 
    static KisPixelSelectionSP generateRandomSelection(const QRect &rc);
};
 
 
KisPixelSelectionSP
KisLayerStyleFilterEnvironment::Private::
generateRandomSelection(const QRect &rc)
{
    KisPixelSelectionSP selection = new KisPixelSelection();
    KisSequentialIterator dstIt(selection, rc);
 
    boost::mt11213b uniformSource;
 
    if (uniformSource.max() >= 0x00FFFFFF) {
        while (dstIt.nextPixel()) {
            int randValue = uniformSource();
            *dstIt.rawData() = (quint8) randValue;
 
            if (!dstIt.nextPixel()) break;
            randValue >>= 8;
            *dstIt.rawData() = (quint8) randValue;
 
            if (!dstIt.nextPixel()) break;
            randValue >>= 8;
            *dstIt.rawData() = (quint8) randValue;
        }
 
    } else {
        while (dstIt.nextPixel()) {
            *dstIt.rawData() = (quint8) uniformSource();
        }
    }
 
    return selection;
}
 
KisLayerStyleFilterEnvironment::KisLayerStyleFilterEnvironment(KisLayer *sourceLayer)
    : m_d(new Private)
{
    Q_ASSERT(sourceLayer);
    m_d->sourceLayer = sourceLayer;
}
 
KisLayerStyleFilterEnvironment::~KisLayerStyleFilterEnvironment()
{
}
 
QRect KisLayerStyleFilterEnvironment::layerBounds() const
{
    return m_d->sourceLayer ? m_d->sourceLayer->projection()->exactBounds() : QRect();
}
 
QRect KisLayerStyleFilterEnvironment::defaultBounds() const
{
    return m_d->sourceLayer ?
        m_d->sourceLayer->original()->defaultBounds()->bounds() : QRect();
}
 
int KisLayerStyleFilterEnvironment::currentLevelOfDetail() const
{
    return m_d->sourceLayer ?
        m_d->sourceLayer->original()->defaultBounds()->currentLevelOfDetail() : 0;
}
 
void KisLayerStyleFilterEnvironment::setupFinalPainter(KisPainter *gc,
                                                       quint8 opacity,
                                                       const QBitArray &channelFlags) const
{
    Q_ASSERT(m_d->sourceLayer);
    gc->setOpacityF(KritaUtils::mergeOpacityF(qreal(opacity) / OPACITY_OPAQUE_U8, qreal(m_d->sourceLayer->opacity()) / OPACITY_OPAQUE_U8));
    gc->setChannelFlags(KritaUtils::mergeChannelFlags(channelFlags, m_d->sourceLayer->channelFlags()));
 
}
 
KisPixelSelectionSP KisLayerStyleFilterEnvironment::cachedRandomSelection(const QRect &requestedRect) const
{
    KisPixelSelectionSP selection = m_d->cachedRandomSelection;
 
    QRect existingRect;
 
    if (selection) {
        existingRect = selection->selectedExactRect();
    }
 
    if (!existingRect.contains(requestedRect)) {
        m_d->cachedRandomSelection =
            Private::generateRandomSelection(requestedRect | existingRect);
    }
 
    return m_d->cachedRandomSelection;
}
 
KoPatternSP KisLayerStyleFilterEnvironment::cachedFlattenedPattern(KoPatternSP pattern) const
{
    if (!pattern->hasAlpha()) return pattern;
 
    auto source = m_d->cachedFlattenedPattern.source<KoPattern>(ResourceType::Patterns);
 
    KoPatternSP resultPattern = source.bestMatch("", pattern->filename(), pattern->name());
    if (resultPattern) return resultPattern;
 
    KoPatternSP flattenedPattern = pattern->cloneWithoutAlpha();
 
    m_d->cachedFlattenedPattern.addResource(flattenedPattern);
 
    return flattenedPattern;
}
 
KisCachedSelection *KisLayerStyleFilterEnvironment::cachedSelection()
{
    return &m_d->globalCachedSelection;
}
 
KisCachedPaintDevice *KisLayerStyleFilterEnvironment::cachedPaintDevice()
{
    return &m_d->globalCachedPaintDevice;
}