Fix crash when switching fullscreen stretching modes when fullscreen

src/qt/qt_mainwindow.cpp

@@ -1154,7 +1154,7 @@ static void update_fullscreen_scale_checkboxes(Ui::MainWindow* ui, QAction* sele
 
     if (video_fullscreen > 0) {
         auto widget = ui->stackedWidget->currentWidget();
-        auto rc = dynamic_cast<RendererCommon*>(widget);
+        auto rc = ui->stackedWidget->rendererWindow;
         rc->onResize(widget->width(), widget->height());
     }
 

src/qt/qt_rendererstack.cpp

@@ -183,6 +183,7 @@ void RendererStack::switchRenderer(Renderer renderer) {
     case Renderer::Software:
     {
         auto sw = new SoftwareRenderer(this);
+        rendererWindow = sw;
         connect(this, &RendererStack::blitToRenderer, sw, &SoftwareRenderer::onBlit, Qt::QueuedConnection);
         current.reset(this->createWindowContainer(sw, this));
     }
@@ -191,6 +192,7 @@ void RendererStack::switchRenderer(Renderer renderer) {
     {
         this->createWinId();
         auto hw = new HardwareRenderer(this);
+        rendererWindow = hw;
         connect(this, &RendererStack::blitToRenderer, hw, &HardwareRenderer::onBlit, Qt::QueuedConnection);
         current.reset(this->createWindowContainer(hw, this));
         break;
@@ -199,6 +201,7 @@ void RendererStack::switchRenderer(Renderer renderer) {
     {
         this->createWinId();
         auto hw = new HardwareRenderer(this, HardwareRenderer::RenderType::OpenGLES);
+        rendererWindow = hw;
         connect(this, &RendererStack::blitToRenderer, hw, &HardwareRenderer::onBlit, Qt::QueuedConnection);
         current.reset(this->createWindowContainer(hw, this));
         break;
@@ -207,6 +210,7 @@ void RendererStack::switchRenderer(Renderer renderer) {
     {
         this->createWinId();
         auto hw = new HardwareRenderer(this, HardwareRenderer::RenderType::OpenGL3);
+        rendererWindow = hw;
         connect(this, &RendererStack::blitToRenderer, hw, &HardwareRenderer::onBlit, Qt::QueuedConnection);
         current.reset(this->createWindowContainer(hw, this));
         break;

src/qt/qt_rendererstack.hpp

@@ -13,6 +13,7 @@ namespace Ui {
 class RendererStack;
 }
 
+class RendererCommon;
 class RendererStack : public QStackedWidget
 {
     Q_OBJECT
@@ -43,6 +44,7 @@ public:
     };
     void switchRenderer(Renderer renderer);
 
+    RendererCommon* rendererWindow{nullptr};
 signals:
     void blitToRenderer(const std::unique_ptr<uint8_t>* img, int, int, int, int, std::atomic_flag* in_use);