HistogramComputationStrokeStrategy.cpp

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/*
 *  SPDX-FileCopyrightText: 2020 Agata Cacko <tamtamy.tymona@gmail.com>
 *  SPDX-FileCopyrightText: 2023 Dmitry Kazakov <dimula73@gmail.com>
 *
 *  SPDX-License-Identifier: GPL-2.0-or-later
 */
#include "HistogramComputationStrokeStrategy.h"
 
#include "KoColorSpace.h"
 
#include "krita_utils.h"
#include "kis_image.h"
#include "kis_sequential_iterator.h"
 
struct HistogramComputationStrokeStrategy::Private
{
 
    class ProcessData : public KisStrokeJobData
    {
    public:
        ProcessData(QRect rect, int _jobId)
            : KisStrokeJobData(CONCURRENT)
            , rectToCalculate(rect)
            , jobId(_jobId)
        {}
 
        QRect rectToCalculate;
        int jobId; // id in the list of results
    };
 
    KisImageSP image;
    std::vector<HistVector> results;
};
 
 
HistogramComputationStrokeStrategy::HistogramComputationStrokeStrategy(KisImageSP image)
    : KisIdleTaskStrokeStrategy(QLatin1String("ComputeHistogram"), kundo2_i18n("Update histogram"))
    , m_d(new Private)
{
    m_d->image = image;
}
 
HistogramComputationStrokeStrategy::~HistogramComputationStrokeStrategy()
{
}
 
void HistogramComputationStrokeStrategy::initStrokeCallback()
{
    KisIdleTaskStrokeStrategy::initStrokeCallback();
 
    QVector<KisStrokeJobData*> jobsData;
    int i = 0;
    QVector<QRect> tileRects = KritaUtils::splitRectIntoPatches(m_d->image->bounds(), KritaUtils::optimalPatchSize());
    m_d->results.resize(tileRects.size());
 
    Q_FOREACH (const QRect &tileRectangle, tileRects) {
        jobsData << new HistogramComputationStrokeStrategy::Private::ProcessData(tileRectangle, i);
        i++;
    }
    addMutatedJobs(jobsData);
}
 
void HistogramComputationStrokeStrategy::doStrokeCallback(KisStrokeJobData *data)
{
    Private::ProcessData *d_pd = dynamic_cast<Private::ProcessData*>(data);
 
    if (!d_pd) {
        KisIdleTaskStrokeStrategy::doStrokeCallback(data);
        return;
    }
 
    QRect calculate = d_pd->rectToCalculate;
 
    KisPaintDeviceSP m_dev = m_d->image->projection();
    QRect imageBounds = m_d->image->bounds();
 
    const KoColorSpace *cs = m_dev->colorSpace();
    quint32 channelCount = m_dev->channelCount();
    quint32 pixelSize = m_dev->pixelSize();
 
    int imageSize = imageBounds.width() * imageBounds.height();
    int nSkip = 1 + (imageSize >> 20); //for speed use about 1M pixels for computing histograms
 
    if (calculate.isEmpty())
        return;
 
    initiateVector(m_d->results[d_pd->jobId], cs);
 
    quint32 toSkip = nSkip;
 
    KisSequentialConstIterator it(m_dev, calculate);
 
    int numConseqPixels = it.nConseqPixels();
    while (it.nextPixels(numConseqPixels)) {
 
        numConseqPixels = it.nConseqPixels();
        const quint8* pixel = it.rawDataConst();
        for (int k = 0; k < numConseqPixels; ++k) {
            if (--toSkip == 0) {
                for (int chan = 0; chan < (int)channelCount; ++chan) {
                    m_d->results[d_pd->jobId][chan][cs->scaleToU8(pixel, chan)]++;
                }
                toSkip = nSkip;
            }
            pixel += pixelSize;
        }
    }
}
 
void HistogramComputationStrokeStrategy::finishStrokeCallback()
{
    HistogramData hisData;
    hisData.colorSpace = m_d->image->projection()->colorSpace();
 
    if (m_d->results.size() == 1) {
        hisData.bins = m_d->results[0];
        Q_EMIT computationResultReady(hisData);
    } else {
 
        quint32 channelCount = m_d->image->projection()->channelCount();
 
        initiateVector(hisData.bins, hisData.colorSpace);
 
        for (int chan = 0; chan < (int)channelCount; chan++) {
            int bsize = hisData.bins[chan].size();
 
            for (int bi = 0; bi < bsize; bi++) {
                hisData.bins[chan][bi] = 0;
                for (int i = 0; i < (int)m_d->results.size(); i++) {
                    hisData.bins[chan][bi] += m_d->results[i][chan][bi];
                }
            }
        }
 
        Q_EMIT computationResultReady(hisData);
    }
 
    KisIdleTaskStrokeStrategy::finishStrokeCallback();
}
 
void HistogramComputationStrokeStrategy::initiateVector(HistVector &vec, const KoColorSpace *colorSpace)
{
    vec.resize(colorSpace->channelCount());
    for (auto &bin : vec) {
        bin.resize(std::numeric_limits<quint8>::max() + 1);
    }
}