Qt: Don't use memcard icon cache for window icon when scaled

It'll get scaled up and down again otherwise.

src/duckstation-qt/gamelistwidget.cpp

@@ -457,36 +457,36 @@ QIcon GameListModel::getIconForGame(const QString& path)
 {
   QIcon ret;
 
-  if (m_show_game_icons && !path.isEmpty())
-  {
-    const auto lock = GameList::GetLock();
-    const GameList::Entry* entry = GameList::GetEntryForPath(path.toStdString());
-    if (!entry)
-      return ret;
+  if (!m_show_game_icons || path.isEmpty())
+    return ret;
 
+  const auto lock = GameList::GetLock();
+  const GameList::Entry* entry = GameList::GetEntryForPath(path.toStdString());
+  if (!entry || entry->serial.empty() || !entry->IsDisc() && !entry->IsDiscSet())
+    return ret;
+
+  // Only use the cache if we're not using larger icons. Otherwise they'll get double scaled.
+  // Provides a small performance boost when using default size icons.
+  if (m_icon_size == MEMORY_CARD_ICON_SIZE)
+  {
     if (const QPixmap* pm = m_memcard_pixmap_cache.Lookup(entry->serial))
     {
       // If we already have the icon cached, return it.
       ret = QIcon(*pm);
       return ret;
     }
-    else
+  }
+
+  // See above.
+  const std::string icon_path = GameList::GetGameIconPath(entry->serial, entry->path);
+  if (!icon_path.empty())
+  {
+    QPixmap newpm;
+    if (!icon_path.empty() && newpm.load(QString::fromStdString(icon_path)))
     {
-      // See above.
-      if (!entry->serial.empty() && (entry->IsDisc() || entry->IsDiscSet()))
-      {
-        const std::string icon_path = GameList::GetGameIconPath(entry->serial, entry->path);
-        if (!icon_path.empty())
-        {
-          QPixmap newpm;
-          if (!icon_path.empty() && newpm.load(QString::fromStdString(icon_path)))
-          {
-            fixIconPixmapSize(newpm);
-            ret = QIcon(*m_memcard_pixmap_cache.Insert(entry->serial, std::move(newpm)));
-            return ret;
-          }
-        }
-      }
+      fixIconPixmapSize(newpm);
+      ret = QIcon(*m_memcard_pixmap_cache.Insert(entry->serial, std::move(newpm)));
+      return ret;
     }
   }
 

src/duckstation-qt/mainwindow.cpp

@@ -641,12 +641,12 @@ void MainWindow::onSystemDestroyed()
     switchToGameListView();
 }
 
-void MainWindow::onSystemGameChanged(const QString& filename, const QString& game_serial, const QString& game_title)
+void MainWindow::onSystemGameChanged(const QString& path, const QString& game_serial, const QString& game_title)
 {
-  s_current_game_path = filename;
+  s_current_game_path = path;
   s_current_game_title = game_title;
   s_current_game_serial = game_serial;
-  s_current_game_icon = m_game_list_widget->getModel()->getIconForGame(filename);
+  s_current_game_icon = m_game_list_widget->getModel()->getIconForGame(path);
 
   updateWindowTitle();
 }

src/duckstation-qt/mainwindow.h

@@ -153,7 +153,7 @@ private Q_SLOTS:
   void onSystemDestroyed();
   void onSystemPaused();
   void onSystemResumed();
-  void onSystemGameChanged(const QString& filename, const QString& game_serial, const QString& game_title);
+  void onSystemGameChanged(const QString& path, const QString& game_serial, const QString& game_title);
   void onSystemUndoStateAvailabilityChanged(bool available, quint64 timestamp);
   void onMediaCaptureStarted();
   void onMediaCaptureStopped();

src/duckstation-qt/qthost.h

@@ -138,7 +138,7 @@ Q_SIGNALS:
   void systemDestroyed();
   void systemPaused();
   void systemResumed();
-  void systemGameChanged(const QString& filename, const QString& game_serial, const QString& game_title);
+  void systemGameChanged(const QString& path, const QString& game_serial, const QString& game_title);
   void systemUndoStateAvailabilityChanged(bool available, quint64 timestamp);
   void gameListRefreshed();
   void gameListRowsChanged(const QList<int>& rows_changed);