#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QPushButton>

QWidget* generateGUI()
{
  auto* w = new QWidget();
  auto* l = new QVBoxLayout(w);
  auto* b = new QPushButton();
  b->setMinimumSize(128, 128);
  b->setIconSize(QSize(64, 64));

#define USE_THEME

#ifdef USE_THEME
  // This produces pixelated icons
  QIcon::setThemeName("MyTheme");
  QIcon::setFallbackSearchPaths(QStringList() << ".");
  b->setIcon(QIcon::fromTheme("spiral"));
#else
    // This produces crisp icons
  b->setIcon(QIcon("spiral.svg"));
#endif

  l->addWidget(b);

  return w;
}

int main(int argc, char* argv[])
{
  QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
  QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);

  QApplication a(argc, argv);

  auto* w = generateGUI();
  w->show();

  return a.exec();
}