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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(constQString&filter,constQImage&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);
}
}
} elseif (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);
}
}
} elseif (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));
}
}
}
}
} elseif (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;
}