C++ KisPaintDeviceSP::convertToQImage方法代码示例

void KisFilterMaskTest::testProjectionSelected()
{
    KisImageSP image;
    KisPaintLayerSP layer;

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();

    QImage qimage(QString(FILES_DATA_DIR) + QDir::separator() + "hakonepa.png");
    QImage inverted(QString(FILES_DATA_DIR) + QDir::separator() + "inverted_hakonepa.png");

    KisFilterSP f = KisFilterRegistry::instance()->value("invert");
    Q_ASSERT(f);
    KisFilterConfiguration * kfc = f->defaultConfiguration(0);
    Q_ASSERT(kfc);

    KisFilterMaskSP mask = new KisFilterMask();
    mask->setFilter(kfc);
    mask->createNodeProgressProxy();

    KisPaintDeviceSP projection = new KisPaintDevice(cs);
    initImage(image, layer, projection, mask);
    projection->convertFromQImage(qimage, 0, 0, 0);

    mask->initSelection(layer);
    mask->select(qimage.rect(), MAX_SELECTED);
    mask->apply(projection, qimage.rect(), qimage.rect(), KisNode::N_FILTHY);
    QCOMPARE(mask->exactBounds(), QRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT));

    QPoint errpoint;
    if (!TestUtil::compareQImages(errpoint, inverted, projection->convertToQImage(0, 0, 0, qimage.width(), qimage.height()))) {
        projection->convertToQImage(0, 0, 0, qimage.width(), qimage.height()).save("filtermasktest2.png");
        QFAIL(QString("Failed to create inverted image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }

}

void KisFilterTest::testDifferentSrcAndDst()
{
    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();

    QImage qimage(QString(FILES_DATA_DIR) + QDir::separator() + "hakonepa.png");
    QImage inverted(QString(FILES_DATA_DIR) + QDir::separator() + "inverted_hakonepa.png");
    KisPaintDeviceSP src = new KisPaintDevice(cs);
    KisPaintDeviceSP dst = new KisPaintDevice(cs);
    KisSelectionSP sel = new KisSelection(new KisSelectionDefaultBounds(src));
    sel->getOrCreatePixelSelection()->invert(); // select everything
    sel->updateProjection();

    src->convertFromQImage(qimage, 0, 0, 0);

    KisFilterSP f = KisFilterRegistry::instance()->value("invert");
    Q_ASSERT(f);

    KisFilterConfiguration * kfc = f->defaultConfiguration(0);
    Q_ASSERT(kfc);

    f->process(src, dst, sel, QRect(QPoint(0,0), qimage.size()), kfc);

    QPoint errpoint;
    if (!TestUtil::compareQImages(errpoint, inverted, dst->convertToQImage(0, 0, 0, qimage.width(), qimage.height()))) {
        dst->convertToQImage(0, 0, 0, qimage.width(), qimage.height()).save("filtertest.png");
        QFAIL(QString("Failed to create inverted image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }
}

void KisFilterTest::testWithProgressUpdater()
{
    TestUtil::TestProgressBar * bar = new TestUtil::TestProgressBar();
    KoProgressUpdater* pu = new KoProgressUpdater(bar);
    KoUpdaterPtr updater = pu->startSubtask();

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();

    QImage qimage(QString(FILES_DATA_DIR) + QDir::separator() + "hakonepa.png");
    QImage inverted(QString(FILES_DATA_DIR) + QDir::separator() + "inverted_hakonepa.png");
    KisPaintDeviceSP dev = new KisPaintDevice(cs);
    dev->convertFromQImage(qimage, 0, 0, 0);

    KisFilterSP f = KisFilterRegistry::instance()->value("invert");
    Q_ASSERT(f);

    KisFilterConfiguration * kfc = f->defaultConfiguration(0);
    Q_ASSERT(kfc);

    f->process(dev, QRect(QPoint(0,0), qimage.size()), kfc, updater);

    QPoint errpoint;
    if (!TestUtil::compareQImages(errpoint, inverted, dev->convertToQImage(0, 0, 0, qimage.width(), qimage.height()))) {
        dev->convertToQImage(0, 0, 0, qimage.width(), qimage.height()).save("filtertest.png");
        QFAIL(QString("Failed to create inverted image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }
    delete pu;
    delete bar;
}

void KisPaintDeviceTest::testMakeClone()
{
    QImage image(QString(FILES_DATA_DIR) + QDir::separator() + "hakonepa.png");

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();
    KisPaintDeviceSP srcDev = new KisPaintDevice(cs);
    srcDev->convertFromQImage(image, 0);
    srcDev->move(10,10);

    const KoColorSpace * weirdCS = KoColorSpaceRegistry::instance()->lab16();
    KisPaintDeviceSP dstDev = new KisPaintDevice(weirdCS);
    dstDev->move(1000,1000);

    QVERIFY(!dstDev->fastBitBltPossible(srcDev));

    QRect cloneRect(100,100,200,200);
    QPoint errpoint;

    dstDev->makeCloneFrom(srcDev, cloneRect);

    QVERIFY(*dstDev->colorSpace() == *srcDev->colorSpace());
    QCOMPARE(dstDev->pixelSize(), srcDev->pixelSize());
    QCOMPARE(dstDev->x(), srcDev->x());
    QCOMPARE(dstDev->y(), srcDev->y());
    QCOMPARE(dstDev->exactBounds(), cloneRect);

    QImage srcImage = srcDev->convertToQImage(0, cloneRect.x(), cloneRect.y(),
                                              cloneRect.width(), cloneRect.height());
    QImage dstImage = dstDev->convertToQImage(0, cloneRect.x(), cloneRect.y(),
                                              cloneRect.width(), cloneRect.height());
    if (!TestUtil::compareQImages(errpoint, dstImage, srcImage)) {
        QFAIL(QString("Failed to create identical image, first different pixel: %1,%2 \n").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }
}

void KisFilterTest::testOldDataApiAfterCopy()
{
    QRect updateRect(0,0,63,63);

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();
    quint8 *whitePixel = new quint8[cs->pixelSize()];
    cs->fromQColor(Qt::white, whitePixel);
    cs->setOpacity(whitePixel, OPACITY_OPAQUE_U8, 1);

    KisPaintDeviceSP tmp = new KisPaintDevice(cs);

    KisPaintDeviceSP src = new KisPaintDevice(cs);
    src->fill(0, 0, 50, 50, whitePixel);

    /**
     * Make a full copy here to catch the bug.
     * Buggy memento manager would make a commit
     * that is not good.
     */
    KisPaintDeviceSP dst = new KisPaintDevice(*src);

    /**
     * This would write go to a new revision in a buggy
     * memento manager
     */
    dst->clear(updateRect);

    KisFilterSP f = KisFilterRegistry::instance()->value("invert");
    Q_ASSERT(f);
    KisFilterConfiguration * kfc = f->defaultConfiguration(0);
    Q_ASSERT(kfc);

    /**
     * This filter reads from oldRawData, so if we have some
     * weirdness with transactions it will read from old and non-cleared
     * version of the device and we will see a black square instead
     * of empty device in tmp
     */
    f->process(dst, tmp, 0, updateRect, kfc);

    /**
     * In theory, both devices: dst and tmp must be empty by now
     */
    KisPaintDeviceSP reference = new KisPaintDevice(cs);

    QImage refImage = reference->convertToQImage(0,0,0,63,63);
    QImage dstImage = dst->convertToQImage(0,0,0,63,63);
    QImage tmpImage = tmp->convertToQImage(0,0,0,63,63);

    QPoint pt;
    QVERIFY(TestUtil::compareQImages(pt, refImage, dstImage));
    QVERIFY(TestUtil::compareQImages(pt, refImage, tmpImage));

}

void KisTransparencyMaskTest::testApply()
{
    QPoint errpoint;

    KisImageSP image;
    KisPaintLayerSP layer;
    KisPaintDeviceSP dev;
    KisTransparencyMaskSP mask;


    QRect applyRect(0, 0, 200, 100);

    // Everything is selected
    initImage(image, layer, dev, mask);
    mask->initSelection(layer);
    mask->apply(dev, applyRect, applyRect, KisNode::N_FILTHY);
    QImage qimage = dev->convertToQImage(0, 0, 0, 200, 100);

    if (!TestUtil::compareQImages(errpoint,
                                  QImage(QString(FILES_DATA_DIR) + QDir::separator() + "transparency_mask_test_2.png"),
                                  qimage)) {
        QFAIL(QString("Failed to mask out image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }

    // Invert the mask, so that nothing will be selected, then select a rect
    initImage(image, layer, dev, mask);
    mask->initSelection(layer);
    mask->selection()->pixelSelection()->invert();
    mask->apply(dev, applyRect, applyRect, KisNode::N_FILTHY);
    qimage = dev->convertToQImage(0, 0, 0, 200, 100);

    if (!TestUtil::compareQImages(errpoint,
                                  QImage(QString(FILES_DATA_DIR) + QDir::separator() + "transparency_mask_test_1.png"),
                                  qimage)) {
        QFAIL(QString("Failed to mask in image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }

    initImage(image, layer, dev, mask);
    mask->initSelection(layer);
    mask->selection()->pixelSelection()->invert();
    mask->select(QRect(50, 0, 100, 100));
    mask->apply(dev, applyRect, applyRect, KisNode::N_FILTHY);
    qimage = dev->convertToQImage(0, 0, 0, 200, 100);

    if (!TestUtil::compareQImages(errpoint,
                                  QImage(QString(FILES_DATA_DIR) + QDir::separator() + "transparency_mask_test_3.png"),
                                  qimage)) {

        QFAIL(QString("Failed to apply partial mask, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }

}

void testWrappedLineIteratorReadMoreThanBounds(QString testName)
{
    const KoColorSpace *cs = KoColorSpaceRegistry::instance()->rgb8();
    KisPaintDeviceSP dev = createWrapAroundPaintDevice(cs);
    KisPaintDeviceSP dst = new KisPaintDevice(cs);

    // fill device with a gradient
    QRect bounds = dev->defaultBounds()->bounds();
    for (int y = bounds.y(); y < bounds.y() + bounds.height(); y++) {
        for (int x = bounds.x(); x < bounds.x() + bounds.width(); x++) {
            QColor c((10 * x) % 255, (10 * y) % 255, 0, 255);
            dev->setPixel(x, y, c);
        }
    }

    // test rect doesn't fit the wrap rect in both dimentions
    const QRect &rect(bounds.adjusted(-6,-6,8,8));
    KisRandomAccessorSP dstIt = dst->createRandomAccessorNG(rect.x(), rect.y());
    IteratorSP it = createIterator<IteratorSP>(dev, rect);

    for (int y = rect.y(); y < rect.y() + rect.height(); y++) {
        for (int x = rect.x(); x < rect.x() + rect.width(); x++) {
            quint8 *data = it->rawData();

            QVERIFY(checkConseqPixels<IteratorSP>(it->nConseqPixels(), QPoint(x, y), KisWrappedRect(rect, bounds)));

            dstIt->moveTo(x, y);
            memcpy(dstIt->rawData(), data, cs->pixelSize());

            QVERIFY(checkXY<IteratorSP>(QPoint(it->x(), it->y()), QPoint(x,y)));

            bool stepDone = it->nextPixel();
            QCOMPARE(stepDone, x < rect.x() + rect.width() - 1);
        }
        if (!nextRowGeneral(it, y, rect)) break;
    }

    testName = QString("%1_%2_%3_%4_%5")
        .arg(testName)
        .arg(rect.x())
        .arg(rect.y())
        .arg(rect.width())
        .arg(rect.height());

    QRect rc = rect;
    QImage result = dst->convertToQImage(0, rc.x(), rc.y(), rc.width(), rc.height());
    QImage ref = dev->convertToQImage(0, rc.x(), rc.y(), rc.width(), rc.height());

    QVERIFY(TestUtil::checkQImage(result, "paint_device_test", "wrapped_iterators_huge", testName));
}

//#define SAVE_OUTPUT_IMAGES
void KisAutoBrushTest::testCopyMasking()
{
    int w = 64;
    int h = 64;
    int x = 0;
    int y = 0;
    QRect rc(x, y, w, h);

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();

    KoColor black(Qt::black, cs);
    KoColor red(Qt::red, cs);


    KisPaintDeviceSP tempDev = new KisPaintDevice(cs);
    tempDev->fill(0, 0, w, h, red.data());
#ifdef SAVE_OUTPUT_IMAGES
    tempDev->convertToQImage(0).save("tempDev.png");
#endif

    KisCircleMaskGenerator * mask = new KisCircleMaskGenerator(w, 1.0, 0.5, 0.5, 2, true);
    KisAutoBrush brush(mask, 0, 0);

    KisFixedPaintDeviceSP maskDab = new KisFixedPaintDevice(cs);
    brush.mask(maskDab, black, KisDabShape(), KisPaintInformation());
    maskDab->convertTo(KoColorSpaceRegistry::instance()->alpha8());

#ifdef SAVE_OUTPUT_IMAGES
    maskDab->convertToQImage(0, 0, 0, 64, 64).save("maskDab.png");
#endif

    QCOMPARE(tempDev->exactBounds(), rc);
    QCOMPARE(maskDab->bounds(), rc);

    KisFixedPaintDeviceSP dev2fixed = new KisFixedPaintDevice(cs);
    dev2fixed->setRect(rc);
    dev2fixed->initialize();
    tempDev->readBytes(dev2fixed->data(), rc);
    dev2fixed->convertToQImage(0).save("converted-tempDev-to-fixed.png");

    KisPaintDeviceSP dev = new KisPaintDevice(cs);
    KisPainter painter(dev);
    painter.setCompositeOp(COMPOSITE_COPY);
    painter.bltFixedWithFixedSelection(x, y, dev2fixed, maskDab, 0, 0, 0, 0, rc.width(), rc.height());
    //painter.bitBltWithFixedSelection(x, y, tempDev, maskDab, 0, 0, 0, 0, rc.width(), rc.height());

#ifdef SAVE_OUTPUT_IMAGES
    dev->convertToQImage(0).save("final.png");
#endif
}

void testWrappedLineIterator(QString testName, const QRect &rect)
{
    testName = QString("%1_%2_%3_%4_%5")
        .arg(testName)
        .arg(rect.x())
        .arg(rect.y())
        .arg(rect.width())
        .arg(rect.height());

    const KoColorSpace *cs = KoColorSpaceRegistry::instance()->rgb8();
    KisPaintDeviceSP dev = createWrapAroundPaintDevice(cs);

    // test rect fits the wrap rect in both dimensions
    IteratorSP it = createIterator<IteratorSP>(dev, rect);

    int y = 0;
    do {
        int x = 0;
        do {
            quint8 *data = it->rawData();

            data[0] = 10 * x;
            data[1] = 10 * y;
            data[2] = 0;
            data[3] = 255;

            x++;
        } while (it->nextPixel());
    } while (nextRowGeneral(it, ++y, rect));

    QRect rc = dev->defaultBounds()->bounds() | dev->exactBounds();
    QImage result = dev->convertToQImage(0, rc.x(), rc.y(), rc.width(), rc.height());

    QVERIFY(TestUtil::checkQImage(result, "paint_device_test", "wrapped_iterators", testName));
}

void KisFillPainterTest::benchmarkFillingScanlineColor()
{
    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();
    KisPaintDeviceSP dev = new KisPaintDevice(cs);

    QImage srcImage(TestUtil::fetchDataFileLazy("heavy_labyrinth.png"));
    QVERIFY(!srcImage.isNull());

    QRect imageRect = srcImage.rect();

    dev->convertFromQImage(srcImage, 0, 0, 0);


    QBENCHMARK_ONCE {
        KisScanlineFill gc(dev, QPoint(), imageRect);
        gc.setThreshold(THRESHOLD);
        gc.fillColor(KoColor(Qt::red, dev->colorSpace()));
    }

    QImage resultImage =
        dev->convertToQImage(0,
                             imageRect.x(), imageRect.y(),
                             imageRect.width(), imageRect.height());

    QVERIFY(TestUtil::checkQImage(resultImage,
                                  "fill_painter",
                                  "scanline_",
                                  "heavy_labyrinth_top_left"));
}

void KisTransformWorkerTest::testIdentity()
{
    TestUtil::TestProgressBar bar;
    KoProgressUpdater pu(&bar);
    KoUpdaterPtr updater = pu.startSubtask();

    const KoColorSpace * cs = KoColorSpaceRegistry::instance()->rgb8();
    QImage image(QString(FILES_DATA_DIR) + QDir::separator() + "mirror_source.png");
    KisPaintDeviceSP dev = new KisPaintDevice(cs);
    dev->convertFromQImage(image, "");
    KisFilterStrategy * filter = new KisBoxFilterStrategy();

    KisTransaction t("test", dev);
    KisTransformWorker tw(dev, 1.0, 1.0,
                          0.0, 0.0,
                          0.0, 0.0,
                          0.0,
                          0, 0, updater, filter, true);
    tw.run();
    t.end();
    
    QRect rc = dev->exactBounds();

    QVERIFY(rc.width() ==image.width());
    QVERIFY(rc.height() == image.height());

    QImage result = dev->convertToQImage(0, rc.x(), rc.y(), rc.width(), rc.height());
    QPoint errpoint;
    if (!TestUtil::compareQImages(errpoint, image, result)) {
        image.save("test_identity_source.png");
        result.save("test_identity_result.png");
        QFAIL(QString("Failed to apply identity transformation to image, first different pixel: %1,%2 \n").arg(errpoint.x()).arg(errpoint.y()).toAscii());
    }
}

void KisConvolutionPainterTest::testGaussianBase(KisPaintDeviceSP dev, bool useFftw, const QString &prefix)
{
   QBitArray channelFlags =
       KoColorSpaceRegistry::instance()->rgb8()->channelFlags(true, true);

   KisPainter gc(dev);


   qreal horizontalRadius = 5, verticalRadius = 5;

   for(int i = 0; i < 3 ; i++, horizontalRadius+=5, verticalRadius+=5)
   {
       QTime timer;
       timer.start();

       gc.beginTransaction();

       if (( horizontalRadius > 0 ) && ( verticalRadius > 0 )) {
           KisPaintDeviceSP interm = new KisPaintDevice(dev->colorSpace());

           KisConvolutionKernelSP kernelHoriz = KisGaussianKernel::createHorizontalKernel(horizontalRadius);
           KisConvolutionKernelSP kernelVertical = KisGaussianKernel::createVerticalKernel(verticalRadius);

           const QRect applyRect = dev->exactBounds();

           KisConvolutionPainter::TestingEnginePreference enginePreference =
               useFftw ?
               KisConvolutionPainter::FFTW :
               KisConvolutionPainter::SPATIAL;

           KisConvolutionPainter horizPainter(interm, enginePreference);
           horizPainter.setChannelFlags(channelFlags);
           horizPainter.applyMatrix(kernelHoriz, dev,
                                    applyRect.topLeft() - QPoint(0, verticalRadius),
                                    applyRect.topLeft() - QPoint(0, verticalRadius),
                                    applyRect.size() + QSize(0, 2 * verticalRadius),
                                    BORDER_REPEAT);

           KisConvolutionPainter verticalPainter(dev, enginePreference);
           verticalPainter.setChannelFlags(channelFlags);
           verticalPainter.applyMatrix(kernelVertical, interm,
                                       applyRect.topLeft(),
                                       applyRect.topLeft(),
                                       applyRect.size(), BORDER_REPEAT);

           QImage result = dev->convertToQImage(0, applyRect.x(), applyRect.y(), applyRect.width(), applyRect.height());

           QString engine = useFftw ? "fftw" : "spatial";
           QString testCaseName = QString("test_gaussian_%1_%2_%3.png").arg(horizontalRadius).arg(verticalRadius).arg(engine);

           TestUtil::checkQImage(result,
                                 "convolution_painter_test",
                                 QString("gaussian_") + prefix,
                                 testCaseName);

           gc.revertTransaction();
       }
       dbgKrita << "Elapsed time:" << timer.elapsed() << "ms";
    }
}

void KisFilterSelectionsBenchmark::testGoodSelections(int num)
{
#if(USE_GOOD_SELECTIONS==1)
    KisPaintDeviceSP projection =
        new KisPaintDevice(m_device->colorSpace());

    double avTime;
    KisTimeCounter timer;

    QRect filterRect = m_selection->selectedExactRect();
    KisConstProcessingInformation src(m_device,  filterRect.topLeft(), m_selection);
    KisProcessingInformation dst(projection, filterRect.topLeft(), 0);

    timer.restart();
    for (int i = 0; i < num; i++) {
        KisTransaction transac(0, projection, 0);
        m_filter->processSpecial(src, dst, filterRect.size(), m_configuration, 0);
    }
    avTime = double(timer.elapsed()) / num;

    projection->convertToQImage(0).save("TFS__GOOD_SELECTIONS.png");

    if (num > WARMUP_CYCLES || SHOW_WARMUPS)
        dbgKrita << "Selections with alpha (filter):\t" << avTime;
#else /* if (USE_GOOD_SELECTIONS!=1) */
    if (num > WARMUP_CYCLES || SHOW_WARMUPS)
        dbgKrita << "Selections with alpha (filter):\t [Disabled]";
#endif
}

void KisFilterSelectionsBenchmark::testBitBltSelections(int num)
{
    KisPaintDeviceSP projection =
        new KisPaintDevice(m_device->colorSpace());

    double avTime;
    KisTimeCounter timer;

    QRect filterRect = m_selection->selectedExactRect();

    timer.restart();
    for (int i = 0; i < num; i++) {
        KisPaintDeviceSP cacheDevice = new KisPaintDevice(projection->colorSpace());

        KisTransaction transac(cacheDevice, 0);
        m_filter->process(m_device, cacheDevice, 0, filterRect, m_configuration, 0);

        KisPainter gc(projection);
        gc.beginTransaction();
        gc.setCompositeOp(projection->colorSpace()->compositeOp(COMPOSITE_ALPHA_DARKEN));
        gc.setSelection(m_selection);
        gc.bitBlt(filterRect.topLeft(), cacheDevice, filterRect);
        gc.deleteTransaction();
    }
    avTime = double(timer.elapsed()) / num;

    projection->convertToQImage(0).save("TFS__BITBLT_WITH_SELECTIONS.png");

    if (num > WARMUP_CYCLES || SHOW_WARMUPS)
        dbgKrita << "bitBlt with sel:\t\t\t" << avTime;
}

void KisConvolutionPainterTest::testIdentityConvolution()
{
    QImage qimage(QString(FILES_DATA_DIR) + QDir::separator() + "hakonepa.png");

    KisPaintDeviceSP dev = new KisPaintDevice(KoColorSpaceRegistry::instance()->rgb8());
    dev->convertFromQImage(qimage, 0, 0, 0);

    KisConvolutionKernelSP kernel = new KisConvolutionKernel(3, 3, 0, 0);
    kernel->data()(0) = 0;
    kernel->data()(1) = 0;
    kernel->data()(2) = 0;
    kernel->data()(3) = 0;
    kernel->data()(4) = 1;
    kernel->data()(5) = 0;
    kernel->data()(6) = 0;
    kernel->data()(7) = 0;
    kernel->data()(8) = 0;
    KisConvolutionPainter gc(dev);
    gc.beginTransaction();
    gc.applyMatrix(kernel, dev, QPoint(0, 0), QPoint(0, 0), QSize(qimage.width(), qimage.height()));
    gc.deleteTransaction();

    QImage resultImage = dev->convertToQImage(0, 0, 0, qimage.width(), qimage.height());

    QPoint errpoint;
    if (!TestUtil::compareQImages(errpoint, qimage, resultImage)) {
        resultImage.save("identity_convolution.png");
        QFAIL(QString("Identity kernel did change image, first different pixel: %1,%2 ").arg(errpoint.x()).arg(errpoint.y()).toLatin1());
    }
}