Make all splash screen text scalable

src/StelSplashScreen.cpp

@@ -86,12 +86,51 @@ void SplashScreen::SplashScreenWidget::paintEvent(QPaintEvent* event)
 {
 	QSplashScreen::paintEvent(event);
 
-	// Add version text
 	QPainter p(this);
 	p.setRenderHint(QPainter::Antialiasing);
 	p.setPen(Qt::white);
+
+	// Add branding text: "Stellarium" in large bold font centered horizontally,
+	// and "stellarium.org" under it in a smaller font, both aligned to each
+	// other on the right side.
+	QFont font("Sans");
+	font.setPixelSize(55 * sizeRatio);
+	font.setWeight(QFont::Bold);
+	static const QString titleText = "Stellarium";
+	QFontMetrics titleFM(font);
+	auto titleBR = titleFM.tightBoundingRect(titleText);
+	const double maxWidth = sizeRatio * 310;
+	if(titleBR.width() > maxWidth)
+	{
+		font.setStretch(QFont::SemiCondensed);
+		titleFM = QFontMetrics(font);
+		titleBR = titleFM.tightBoundingRect(titleText);
+	}
+	if(titleBR.width() > maxWidth)
+	{
+		font.setStretch(QFont::Condensed);
+		titleFM = QFontMetrics(font);
+		titleBR = titleFM.tightBoundingRect(titleText);
+	}
+	p.setFont(font);
+	const QPoint titlePos((width() - titleBR.width()) / 2,
+	                      std::lround(height() * 0.89));
+	titleBR.translate(titlePos);
+	p.drawText(titlePos, titleText);
+	font.setWeight(QFont::Normal);
+	font.setPixelSize(18 * sizeRatio);
+	p.setFont(font);
+	static const QString subtitleText = "stellarium.org";
+	const QFontMetrics subtitleFM(font);
+	const auto subtitleBR = subtitleFM.tightBoundingRect(subtitleText);
+	p.drawText(QPoint(titleBR.right() - subtitleBR.width() - 1,
+	                  titleBR.bottom() + subtitleBR.height()),
+	           subtitleText);
+
+	// Add version text
 #if defined(GIT_REVISION)
 	QFontMetrics metrics(splashFont);
+	p.setFont(this->font());
 	p.drawText(QPointF(metrics.averageCharWidth(), 1.3*metrics.height()), QString("%1+ (v%2)").arg(StelUtils::getApplicationPublicVersion(), StelUtils::getApplicationVersion()));
 #else
 	QFont versionFont(splashFont);
@@ -100,8 +139,8 @@ void SplashScreen::SplashScreenWidget::paintEvent(QPaintEvent* event)
 	versionFont.setBold(true);
 	QFontMetrics versionMetrics(versionFont);
 	p.setFont(versionFont);
-	const int height = BASE_PIXMAP_HEIGHT * sizeRatio;
-	p.drawText(height - versionMetrics.horizontalAdvance(version), 0.803 * height, version);
+	p.drawText(titleBR.right() - versionMetrics.tightBoundingRect(version).width() - 1,
+	           0.8 * height(), version);
 #endif
 
 	painted=true;