[Qt] Support setting button icon from font glyph

src/xenia/ui/qt/widgets/push_button.cc

@@ -20,6 +20,31 @@ XPushButton::XPushButton(const QIcon& icon, const QString& text,
   Build();
 }
 
+void XPushButton::SetIconFromGlyph(QChar glyph, QColor color, int size) {
+  auto glyph_font = QFont("Segoe MDL2 Assets", size);
+  // Measure the Glyph
+  QFontMetrics measure(glyph_font);
+  QRect icon_rect = measure.boundingRect(glyph);
+  double max = qMax(icon_rect.width(), icon_rect.height());
+
+  // Create the Pixmap
+  // boundingRect can be inaccurate so add a 4px padding to be safe
+  QPixmap pixmap(max + 4, max + 4);
+  pixmap.fill(Qt::transparent);
+
+  // Paint the Glyph
+  QPainter painter(&pixmap);
+  painter.setFont(glyph_font);
+  painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
+  painter.setPen(QPen(color));
+
+  painter.drawText(pixmap.rect(), Qt::AlignVCenter, glyph);
+
+  painter.end();
+
+  this->setIcon(pixmap);
+}
+
 void XPushButton::Build() {
   setFlat(true);
   setCursor(Qt::PointingHandCursor);

src/xenia/ui/qt/widgets/push_button.h

@@ -16,6 +16,8 @@ class XPushButton : public Themeable<QPushButton> {
   XPushButton(const QIcon& icon, const QString& text,
               QWidget* parent = nullptr);
 
+  void SetIconFromGlyph(QChar glyph, QColor color = Qt::white, int size = 64);
+
  private:
   void Build();
 };