KisPaintDeviceSP KisShearVisitor::yShear(KisPaintDeviceSP src, qreal shearY, KoUpdater *progress) { int start = progress->progress(); KisPaintDeviceSP dst = KisPaintDeviceSP(new KisPaintDevice(src->colorSpace())); KoMixColorsOp * mixOp = src->colorSpace()->mixColorsOp(); dst->setX(src->x()); dst->setY(src->y()); QRect r = src->exactBounds(); qreal displacement; qint32 displacementInt; qreal weight; for (qint32 x = r.left(); x <= r.right(); x++) { //calculate displacement displacement = x * shearY; displacementInt = (qint32)(floor(displacement)); weight = displacement - displacementInt; qint16 pixelWeights[2]; pixelWeights[0] = static_cast<quint8>(weight * 255 + 0.5); pixelWeights[1] = 255 - pixelWeights[0]; KisVLineConstIteratorPixel srcIt = src->createVLineIterator(x, r.y(), r.height() + 1); KisVLineIteratorPixel leftSrcIt = src->createVLineIterator(x, r.y() - 1, r.height() + 1); KisVLineIteratorPixel dstIt = dst->createVLineIterator(x, r.y() + displacementInt, r.height() + 1); while (!srcIt.isDone()) { const quint8 *pixelPtrs[2]; pixelPtrs[0] = leftSrcIt.rawData(); pixelPtrs[1] = srcIt.rawData(); mixOp->mixColors(pixelPtrs, pixelWeights, 2, dstIt.rawData()); ++srcIt; ++leftSrcIt; ++dstIt; } progress->setProgress(start + x); } return dst; }