Qt: Fix undesired screen filtering when paused (fixes #1602)

CHANGES

@@ -103,6 +103,7 @@ Other fixes:
  - Qt: Fix several cases where shader selections don't get saved
  - Qt: Fix division by zero error in invalid TilePainter state
  - Qt: Fix "restart needed" dialog after first config (fixes mgba.io/i/1601)
+ - Qt: Fix undesired screen filtering when paused (fixes mgba.io/i/1602)
 Misc:
  - GB Memory: Support manual SRAM editing (fixes mgba.io/i/1580)
  - SDL: Use controller GUID instead of name

src/platform/qt/Window.cpp

@@ -259,6 +259,7 @@ void Window::reloadConfig() {
 		m_display->lockAspectRatio(opts->lockAspectRatio);
 		m_display->filter(opts->resampleVideo);
 	}
+	m_screenWidget->filter(opts->resampleVideo);
 
 	m_inputController.setScreensaverSuspendable(opts->suspendScreensaver);
 }
@@ -909,6 +910,7 @@ void Window::reloadDisplayDriver() {
 	m_display->lockIntegerScaling(opts->lockIntegerScaling);
 	m_display->interframeBlending(opts->interframeBlending);
 	m_display->filter(opts->resampleVideo);
+	m_screenWidget->filter(opts->resampleVideo);
 	m_config->updateOption("showOSD");
 #if defined(BUILD_GL) || defined(BUILD_GLES2)
 	if (opts->shader) {
@@ -1387,6 +1389,7 @@ void Window::setupMenu(QMenuBar* menubar) {
 		if (m_display) {
 			m_display->filter(value.toBool());
 		}
+		m_screenWidget->filter(value.toBool());
 	}, this);
 	m_config->updateOption("resampleVideo");
 
@@ -1948,11 +1951,15 @@ void WindowBackground::setLockAspectRatio(bool lock) {
 	m_lockAspectRatio = lock;
 }
 
+void WindowBackground::filter(bool filter) {
+	m_filter = filter;
+}
+
 void WindowBackground::paintEvent(QPaintEvent* event) {
 	QWidget::paintEvent(event);
 	const QPixmap& logo = pixmap();
 	QPainter painter(this);
-	painter.setRenderHint(QPainter::SmoothPixmapTransform);
+	painter.setRenderHint(QPainter::SmoothPixmapTransform, m_filter);
 	painter.fillRect(QRect(QPoint(), size()), Qt::black);
 	QSize s = size();
 	QSize ds = s;

src/platform/qt/Window.h

@@ -245,6 +245,7 @@ public:
 	void setDimensions(int width, int height);
 	void setLockIntegerScaling(bool lock);
 	void setLockAspectRatio(bool lock);
+	void filter(bool filter);
 
 	const QPixmap& pixmap() const { return m_pixmap; }
 
@@ -258,6 +259,7 @@ private:
 	int m_aspectHeight;
 	bool m_lockAspectRatio;
 	bool m_lockIntegerScaling;
+	bool m_filter;
 };
 
 }