extrafiltersplugin.cpp Example File

tools/plugandpaint/plugins/extrafilters/extrafiltersplugin.cpp
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#include "extrafiltersplugin.h" #include <QtWidgets> #include <math.h> #include <stdlib.h> QStringList ExtraFiltersPlugin::filters() const { return {tr("Flip Horizontally"), tr("Flip Vertically"), tr("Smudge..."), tr("Threshold...")}; } QImage ExtraFiltersPlugin::filterImage(const QString &filter, const QImage &image, QWidget *parent) { QImage original = image.convertToFormat(QImage::Format_RGB32); QImage result = original; if (filter == tr("Flip Horizontally")) { for (int y = 0; y < original.height(); ++y) { for (int x = 0; x < original.width(); ++x) { QRgb pixel = original.pixel(original.width() - x - 1, y); result.setPixel(x, y, pixel); } } } else if (filter == tr("Flip Vertically")) { for (int y = 0; y < original.height(); ++y) { for (int x = 0; x < original.width(); ++x) { QRgb pixel = original.pixel(x, original.height() - y - 1); result.setPixel(x, y, pixel); } } } else if (filter == tr("Smudge...")) { bool ok; int numIters = QInputDialog::getInt(parent, tr("Smudge Filter"), tr("Enter number of iterations:"), 5, 1, 20, 1, &ok); if (ok) { for (int i = 0; i < numIters; ++i) { for (int y = 1; y < original.height() - 1; ++y) { for (int x = 1; x < original.width() - 1; ++x) { QRgb p1 = original.pixel(x, y); QRgb p2 = original.pixel(x, y + 1); QRgb p3 = original.pixel(x, y - 1); QRgb p4 = original.pixel(x + 1, y); QRgb p5 = original.pixel(x - 1, y); int red = (qRed(p1) + qRed(p2) + qRed(p3) + qRed(p4) + qRed(p5)) / 5; int green = (qGreen(p1) + qGreen(p2) + qGreen(p3) + qGreen(p4) + qGreen(p5)) / 5; int blue = (qBlue(p1) + qBlue(p2) + qBlue(p3) + qBlue(p4) + qBlue(p5)) / 5; int alpha = (qAlpha(p1) + qAlpha(p2) + qAlpha(p3) + qAlpha(p4) + qAlpha(p5)) / 5; result.setPixel(x, y, qRgba(red, green, blue, alpha)); } } } } } else if (filter == tr("Threshold...")) { bool ok; int threshold = QInputDialog::getInt(parent, tr("Threshold Filter"), tr("Enter threshold:"), 10, 1, 256, 1, &ok); if (ok) { int factor = 256 / threshold; for (int y = 0; y < original.height(); ++y) { for (int x = 0; x < original.width(); ++x) { QRgb pixel = original.pixel(x, y); result.setPixel(x, y, qRgba(qRed(pixel) / factor * factor, qGreen(pixel) / factor * factor, qBlue(pixel) / factor * factor, qAlpha(pixel))); } } } } return result; }