C++ (Cpp) downsamplePixels Exemples

Exemple #1

QRect KisImagePyramid::downsampleByFactor2(const QRect& srcRect,
        KisPaintDevice* src,
        KisPaintDevice* dst)
{
    qint32 srcX, srcY, srcWidth, srcHeight;
    srcRect.getRect(&srcX, &srcY, &srcWidth, &srcHeight);
    alignRectBy2(srcX, srcY, srcWidth, srcHeight);

    // Nothing to do
    if (srcWidth < 1) return QRect();
    if (srcHeight < 1) return QRect();

    qint32 dstX = srcX / 2;
    qint32 dstY = srcY / 2;
    qint32 dstWidth = srcWidth / 2;
    qint32 dstHeight = srcHeight / 2;

    KisHLineConstIteratorSP srcIt0 = src->createHLineConstIteratorNG(srcX, srcY, srcWidth);
    KisHLineConstIteratorSP srcIt1 = src->createHLineConstIteratorNG(srcX, srcY + 1, srcWidth);
    KisHLineIteratorSP dstIt = dst->createHLineIteratorNG(dstX, dstY, dstWidth);

    int conseqPixels = 0;
    for (int row = 0; row < dstHeight; ++row) {
        do {
            int srcItConseq = srcIt0->nConseqPixels();
            int dstItConseq = dstIt->nConseqPixels();
            conseqPixels = qMin(srcItConseq, dstItConseq * 2);

            Q_ASSERT(!isOdd(conseqPixels));

            downsamplePixels(srcIt0->oldRawData(), srcIt1->oldRawData(),
                             dstIt->rawData(), conseqPixels);


            srcIt1->nextPixels(conseqPixels);
            dstIt->nextPixels(conseqPixels / 2);
        } while (srcIt0->nextPixels(conseqPixels));
        srcIt0->nextRow();
        srcIt0->nextRow();
        srcIt1->nextRow();
        srcIt1->nextRow();
        dstIt->nextRow();
    }
    return QRect(dstX, dstY, dstWidth, dstHeight);
}

Exemple #2

Fichier : kis_image_pyramid.cpp Projet : KDE/calligra-history

QRect KisImagePyramid::downsampleByFactor2(const QRect& srcRect,
        KisPaintDevice* src,
        KisPaintDevice* dst)
{
    qint32 srcX, srcY, srcWidth, srcHeight;
    srcRect.getRect(&srcX, &srcY, &srcWidth, &srcHeight);
    alignRectBy2(srcX, srcY, srcWidth, srcHeight);

    qint32 dstX = srcX / 2;
    qint32 dstY = srcY / 2;
    qint32 dstWidth = srcWidth / 2;
    qint32 dstHeight = srcHeight / 2;

    KisHLineConstIteratorPixel srcIt0 = src->createHLineConstIterator(srcX, srcY, srcWidth);
    KisHLineConstIteratorPixel srcIt1 = src->createHLineConstIterator(srcX, srcY + 1, srcWidth);
    KisHLineIteratorPixel dstIt = dst->createHLineIterator(dstX, dstY, dstWidth);

    for (int row = 0; row < dstHeight; ++row) {
        while (!dstIt.isDone()) {
            int srcItConseq = srcIt0.nConseqHPixels();
            int dstItConseq = dstIt.nConseqHPixels();
            int conseqPixels = qMin(srcItConseq, dstItConseq * 2);

            Q_ASSERT(!isOdd(conseqPixels));

            downsamplePixels(srcIt0.rawData(), srcIt1.rawData(),
                             dstIt.rawData(), conseqPixels);

            srcIt0 += conseqPixels;
            srcIt1 += conseqPixels;
            dstIt += conseqPixels / 2;
        }
        srcIt0.nextRow();
        srcIt0.nextRow();
        srcIt1.nextRow();
        srcIt1.nextRow();
        dstIt.nextRow();
    }
    return QRect(dstX, dstY, dstWidth, dstHeight);
}