Function rasterizeSvgIcon

pj_widgets/src/DateRangePicker.cpp:129–143

Rasterize already-prepared SVG bytes into a px-logical QIcon at size*DPR so it stays crisp on HiDPI. Callers own the theming/recoloring of `svg_data`; this is the shared QSvgRenderer + DPR-scaling tail behind both icon paths below (and mirrors widget_binding.cpp's render path).

// the shared QSvgRenderer + DPR-scaling tail behind both icon paths below (and
// mirrors widget_binding.cpp's render path).
QIcon rasterizeSvgIcon(const QByteArray& svg_data, int px) {
  QSvgRenderer renderer(svg_data);
  if (!renderer.isValid()) {
    return QIcon();
  }
  const qreal dpr = qApp ? qApp->devicePixelRatio() : 1.0;
  QImage image(QSize(px, px) * dpr, QImage::Format_ARGB32);
  image.fill(Qt::transparent);
  QPainter painter(&image);
  renderer.render(&painter);
  painter.end();
  QPixmap pix = QPixmap::fromImage(image);
  pix.setDevicePixelRatio(dpr);
  return QIcon(pix);
}

// Render a qrc SVG into a theme-inked QIcon.
QIcon renderThemedIcon(const QString& resource_path, int px = 16) {