qt-everywhere-src-5.15.1/qtbase/src/widgets/doc/snippets/code/src_gui_image_qpixmapfilter.cpp

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//! [0]
QPixmapColorizeFilter *myFilter = new QPixmapColorFilter;
myFilter->setColor(QColor(128, 0, 0));
myFilter->draw(painter, QPoint(0, 0), originalPixmap);
//! [0]

//! [1]
QPixmapConvolutionFilter *myFilter = new QPixmapConvolutionFilter;
qreal kernel[] = {
     0.0,-1.0, 0.0,
    -1.0, 5.0,-1.0,
     0.0,-1.0, 0.0
    };
myFilter->setConvolutionKernel(kernel, 3, 3);
myFilter->draw(painter, QPoint(0, 0), originalPixmap);
//! [1]

//! [2]
QPixmapDropShadowFilter *myFilter = new QPixmapDropShadowFilter;
myFilter->draw(painter, QPoint(0, 0), originalPixmap);
//! [2]