qt: Migrate to Qt6. (#6418)

.ci/linux-appimage/docker.sh

@@ -17,12 +17,5 @@ rm -rf ./AppDir/usr/local
 #Circumvent missing LibFuse in Docker, by extracting the AppImage
 export APPIMAGE_EXTRACT_AND_RUN=1
 
-#Copy External Libraries
-mkdir -p ./AppDir/usr/plugins/platformthemes
-mkdir -p ./AppDir/usr/plugins/styles
-cp /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqt5ct.so ./AppDir/usr/plugins/platformthemes
-cp /usr/lib/x86_64-linux-gnu/qt5/plugins/platformthemes/libqgtk3.so ./AppDir/usr/plugins/platformthemes
-cp /usr/lib/x86_64-linux-gnu/qt5/plugins/styles/libqt5ct-style.so ./AppDir/usr/plugins/styles
-
 #Build AppImage
-/linuxdeploy-x86_64.AppImage --appdir AppDir --plugin qt --output appimage
+QMAKE=/usr/lib/qt6/bin/qmake DEPLOY_PLATFORM_THEMES=1 /linuxdeploy-x86_64.AppImage --appdir AppDir --plugin qt --output appimage

.ci/linux-mingw/docker.sh

@@ -17,15 +17,14 @@ echo 'Prepare binaries...'
 cd ..
 mkdir package
 
-QT_PLATFORM_DLL_PATH='/usr/x86_64-w64-mingw32/lib/qt/plugins/platforms/'
+QT_PLATFORM_DLL_PATH='/usr/x86_64-w64-mingw32/lib/qt6/plugins/platforms/'
 find build/ -name "citra*.exe" -exec cp {} 'package' \;
 
 # copy Qt plugins
 mkdir package/platforms
 cp "${QT_PLATFORM_DLL_PATH}/qwindows.dll" package/platforms/
-cp -rv "${QT_PLATFORM_DLL_PATH}/../mediaservice/" package/
+cp -rv "${QT_PLATFORM_DLL_PATH}/../multimedia/" package/
 cp -rv "${QT_PLATFORM_DLL_PATH}/../imageformats/" package/
 cp -rv "${QT_PLATFORM_DLL_PATH}/../styles/" package/
-rm -f package/mediaservice/*d.dll
 
 python3 .ci/linux-mingw/scan_dll.py package/*.exe package/imageformats/*.dll "package/"

.ci/macos/deps.sh

@@ -1,13 +1,3 @@
 #!/bin/sh -ex
 
 brew install ccache ninja || true
-
-export QT_VER=5.15.8
-
-mkdir tmp
-cd tmp/
-
-# install Qt
-wget https://github.com/citra-emu/ext-macos-bin/raw/main/qt/qt-${QT_VER}.7z
-7z x qt-${QT_VER}.7z
-sudo cp -rv $(pwd)/qt-${QT_VER}/* /usr/local/

.ci/windows-msvc/build.sh

@@ -6,7 +6,7 @@ cmake .. \
     -G Ninja \
     -DCMAKE_TOOLCHAIN_FILE="$(pwd)/../CMakeModules/MSVCCache.cmake" \
     -DCITRA_USE_CCACHE=ON \
-    -DENABLE_QT_TRANSLATION=OFF \
+    -DENABLE_QT_TRANSLATION=ON \
     -DCITRA_ENABLE_COMPATIBILITY_REPORTING=${ENABLE_COMPATIBILITY_REPORTING:-"OFF"} \
     -DENABLE_COMPATIBILITY_LIST_DOWNLOAD=ON \
     -DUSE_DISCORD_PRESENCE=ON \

CMakeLists.txt

@@ -25,7 +25,7 @@ option(USE_SYSTEM_SDL2 "Use the system SDL2 lib (instead of the bundled one)" OF
 # Set bundled qt as dependent options.
 option(ENABLE_QT "Enable the Qt frontend" ON)
 option(ENABLE_QT_TRANSLATION "Enable translations for the Qt frontend" OFF)
-CMAKE_DEPENDENT_OPTION(CITRA_USE_BUNDLED_QT "Download bundled Qt binaries" ON "ENABLE_QT;MSVC" OFF)
+CMAKE_DEPENDENT_OPTION(CITRA_USE_BUNDLED_QT "Download bundled Qt binaries" ON "ENABLE_QT;MSVC OR APPLE" OFF)
 
 option(ENABLE_WEB_SERVICE "Enable web services (telemetry, etc.)" ON)
 if (MSVC)
@@ -202,23 +202,23 @@ find_package(Threads REQUIRED)
 
 if (ENABLE_QT)
     if (CITRA_USE_BUNDLED_QT)
-        download_qt_external(5.15.2 QT_PREFIX)
+        download_qt_external(6.5.0 QT_PREFIX)
         list(APPEND CMAKE_PREFIX_PATH ${QT_PREFIX})
     endif()
 
-    find_package(Qt5 REQUIRED COMPONENTS Widgets Multimedia Concurrent)
+    find_package(Qt6 REQUIRED COMPONENTS Widgets Multimedia Concurrent)
 
     if (UNIX AND NOT APPLE)
-        find_package(Qt5 REQUIRED COMPONENTS DBus)
+        find_package(Qt6 REQUIRED COMPONENTS DBus)
     endif()
 
     if (ENABLE_QT_TRANSLATION)
-        find_package(Qt5 REQUIRED COMPONENTS LinguistTools)
+        find_package(Qt6 REQUIRED COMPONENTS LinguistTools)
     endif()
 
     if (NOT CITRA_USE_BUNDLED_QT)
-        # Make sure the Qt bin directory is in the prefix path for later consumers.
+        # Make sure the Qt bin directory is in the prefix path for later use, such as in post-build scripts.
-        get_target_property(qmake_executable Qt5::qmake IMPORTED_LOCATION)
+        get_target_property(qmake_executable Qt6::qmake IMPORTED_LOCATION)
         get_filename_component(qt_bin_dir "${qmake_executable}" DIRECTORY)
         list(APPEND CMAKE_PREFIX_PATH ${qt_bin_dir})
     endif()
@@ -282,8 +282,6 @@ if (APPLE)
     find_library(AVFOUNDATION_LIBRARY AVFoundation)
     set(PLATFORM_LIBRARIES ${COCOA_LIBRARY} ${AVFOUNDATION_LIBRARY} ${IOKIT_LIBRARY} ${COREVIDEO_LIBRARY})
 elseif (WIN32)
-    # WSAPoll and SHGetKnownFolderPath (AppData/Roaming) didn't exist before WinNT 6.x (Vista)
-    add_definitions(-D_WIN32_WINNT=0x0601 -DWINVER=0x0601)
     set(PLATFORM_LIBRARIES winmm ws2_32)
     if (MINGW)
         # PSAPI is the Process Status API

CMakeModules/CopyCitraQt5Deps.cmake

@@ -1,47 +0,0 @@
-function(copy_citra_Qt5_deps target_dir)
-    include(WindowsCopyFiles)
-    set(DLL_DEST "${CMAKE_BINARY_DIR}/bin/$<CONFIG>/")
-    set(Qt5_DLL_DIR "${Qt5_DIR}/../../../bin")
-    set(Qt5_PLATFORMS_DIR "${Qt5_DIR}/../../../plugins/platforms/")
-    set(Qt5_MEDIASERVICE_DIR "${Qt5_DIR}/../../../plugins/mediaservice/")
-    set(Qt5_STYLES_DIR "${Qt5_DIR}/../../../plugins/styles/")
-    set(Qt5_IMAGEFORMATS_DIR "${Qt5_DIR}/../../../plugins/imageformats/")
-    set(PLATFORMS ${DLL_DEST}plugins/platforms/)
-    set(MEDIASERVICE ${DLL_DEST}plugins/mediaservice/)
-    set(STYLES ${DLL_DEST}plugins/styles/)
-    set(IMAGEFORMATS ${DLL_DEST}plugins/imageformats/)
-    windows_copy_files(${target_dir} ${Qt5_DLL_DIR} ${DLL_DEST}
-        icudt*.dll
-        icuin*.dll
-        icuuc*.dll
-        Qt5Core$<$<CONFIG:Debug>:d>.*
-        Qt5Gui$<$<CONFIG:Debug>:d>.*
-        Qt5Widgets$<$<CONFIG:Debug>:d>.*
-        Qt5Concurrent$<$<CONFIG:Debug>:d>.*
-        Qt5Multimedia$<$<CONFIG:Debug>:d>.*
-        Qt5Network$<$<CONFIG:Debug>:d>.*
-    )
-    windows_copy_files(citra-qt ${Qt5_PLATFORMS_DIR} ${PLATFORMS} qwindows$<$<CONFIG:Debug>:d>.*)
-    windows_copy_files(citra-qt ${Qt5_MEDIASERVICE_DIR} ${MEDIASERVICE}
-        dsengine$<$<CONFIG:Debug>:d>.*
-        wmfengine$<$<CONFIG:Debug>:d>.*
-    )
-    windows_copy_files(citra-qt ${Qt5_STYLES_DIR} ${STYLES} qwindowsvistastyle$<$<CONFIG:Debug>:d>.*)
-    windows_copy_files(${target_dir} ${Qt5_IMAGEFORMATS_DIR} ${IMAGEFORMATS}
-        qgif$<$<CONFIG:Debug>:d>.dll
-        qicns$<$<CONFIG:Debug>:d>.dll
-        qico$<$<CONFIG:Debug>:d>.dll
-        qjpeg$<$<CONFIG:Debug>:d>.dll
-        qsvg$<$<CONFIG:Debug>:d>.dll
-        qtga$<$<CONFIG:Debug>:d>.dll
-        qtiff$<$<CONFIG:Debug>:d>.dll
-        qwbmp$<$<CONFIG:Debug>:d>.dll
-        qwebp$<$<CONFIG:Debug>:d>.dll
-    )
-
-    # Create an empty qt.conf file. Qt will detect that this file exists, and use the folder that its in as the root folder.
-    # This way it'll look for plugins in the root/plugins/ folder
-    add_custom_command(TARGET citra-qt POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E touch ${DLL_DEST}qt.conf
-    )
-endfunction(copy_citra_Qt5_deps)

CMakeModules/CopyCitraQt6Deps.cmake

@@ -0,0 +1,46 @@
+function(copy_citra_Qt6_deps target_dir)
+    include(WindowsCopyFiles)
+    set(DLL_DEST "${CMAKE_BINARY_DIR}/bin/$<CONFIG>/")
+    set(Qt6_DLL_DIR "${Qt6_DIR}/../../../bin")
+    set(Qt6_PLATFORMS_DIR "${Qt6_DIR}/../../../plugins/platforms/")
+    set(Qt6_MULTIMEDIA_DIR "${Qt6_DIR}/../../../plugins/multimedia/")
+    set(Qt6_STYLES_DIR "${Qt6_DIR}/../../../plugins/styles/")
+    set(Qt6_IMAGEFORMATS_DIR "${Qt6_DIR}/../../../plugins/imageformats/")
+    set(PLATFORMS ${DLL_DEST}plugins/platforms/)
+    set(MULTIMEDIA ${DLL_DEST}plugins/multimedia/)
+    set(STYLES ${DLL_DEST}plugins/styles/)
+    set(IMAGEFORMATS ${DLL_DEST}plugins/imageformats/)
+    windows_copy_files(${target_dir} ${Qt6_DLL_DIR} ${DLL_DEST}
+        icudt*.dll
+        icuin*.dll
+        icuuc*.dll
+        Qt6Core$<$<CONFIG:Debug>:d>.*
+        Qt6Gui$<$<CONFIG:Debug>:d>.*
+        Qt6Widgets$<$<CONFIG:Debug>:d>.*
+        Qt6Concurrent$<$<CONFIG:Debug>:d>.*
+        Qt6Multimedia$<$<CONFIG:Debug>:d>.*
+        Qt6Network$<$<CONFIG:Debug>:d>.*
+    )
+    windows_copy_files(citra-qt ${Qt6_PLATFORMS_DIR} ${PLATFORMS} qwindows$<$<CONFIG:Debug>:d>.*)
+    windows_copy_files(citra-qt ${Qt6_MULTIMEDIA_DIR} ${MULTIMEDIA}
+        windowsmediaplugin$<$<CONFIG:Debug>:d>.*
+    )
+    windows_copy_files(citra-qt ${Qt6_STYLES_DIR} ${STYLES} qwindowsvistastyle$<$<CONFIG:Debug>:d>.*)
+    windows_copy_files(${target_dir} ${Qt6_IMAGEFORMATS_DIR} ${IMAGEFORMATS}
+        qgif$<$<CONFIG:Debug>:d>.dll
+        qicns$<$<CONFIG:Debug>:d>.dll
+        qico$<$<CONFIG:Debug>:d>.dll
+        qjpeg$<$<CONFIG:Debug>:d>.dll
+        qsvg$<$<CONFIG:Debug>:d>.dll
+        qtga$<$<CONFIG:Debug>:d>.dll
+        qtiff$<$<CONFIG:Debug>:d>.dll
+        qwbmp$<$<CONFIG:Debug>:d>.dll
+        qwebp$<$<CONFIG:Debug>:d>.dll
+    )
+
+    # Create an empty qt.conf file. Qt will detect that this file exists, and use the folder that its in as the root folder.
+    # This way it'll look for plugins in the root/plugins/ folder
+    add_custom_command(TARGET citra-qt POST_BUILD
+        COMMAND ${CMAKE_COMMAND} -E touch ${DLL_DEST}qt.conf
+    )
+endfunction(copy_citra_Qt6_deps)

CMakeModules/DownloadExternals.cmake

@@ -70,7 +70,7 @@ function(download_qt_external target prefix_var)
         set(install_args install-tool --outputdir ${base_path} ${host} desktop ${target})
     else()
         set(prefix "${base_path}/${target}/${arch_path}")
-        set(install_args install-qt --outputdir ${base_path} ${host} desktop ${target} ${arch})
+        set(install_args install-qt --outputdir ${base_path} ${host} desktop ${target} ${arch} -m qtmultimedia)
     endif()
 
     if (NOT EXISTS "${prefix}")

src/citra_qt/CMakeLists.txt

@@ -209,7 +209,7 @@ if (ENABLE_QT_TRANSLATION)
     # Update source TS file if enabled
     if (GENERATE_QT_TRANSLATION)
         get_target_property(SRCS citra-qt SOURCES)
-        qt5_create_translation(QM_FILES ${SRCS} ${UIS} ${CITRA_QT_LANGUAGES}/en.ts)
+        qt6_create_translation(QM_FILES ${SRCS} ${UIS} ${CITRA_QT_LANGUAGES}/en.ts)
         add_custom_target(translation ALL DEPENDS ${CITRA_QT_LANGUAGES}/en.ts)
     endif()
 
@@ -218,7 +218,7 @@ if (ENABLE_QT_TRANSLATION)
     list(REMOVE_ITEM LANGUAGES_TS ${CITRA_QT_LANGUAGES}/en.ts)
 
     # Compile TS files to QM files
-    qt5_add_translation(LANGUAGES_QM ${LANGUAGES_TS})
+    qt6_add_translation(LANGUAGES_QM ${LANGUAGES_TS})
 
     # Build a QRC file from the QM file list
     set(LANGUAGES_QRC ${CMAKE_CURRENT_BINARY_DIR}/languages.qrc)
@@ -230,7 +230,7 @@ if (ENABLE_QT_TRANSLATION)
     file(APPEND ${LANGUAGES_QRC} "</qresource></RCC>")
 
     # Add the QRC file to package in all QM files
-    qt5_add_resources(LANGUAGES ${LANGUAGES_QRC})
+    qt6_add_resources(LANGUAGES ${LANGUAGES_QRC})
 else()
     set(LANGUAGES)
 endif()
@@ -257,7 +257,7 @@ if (APPLE)
     )
 elseif(WIN32)
     # compile as a win32 gui application instead of a console application
-    target_link_libraries(citra-qt PRIVATE Qt5::WinMain)
+    target_link_libraries(citra-qt PRIVATE Qt6::EntryPointImplementation)
     if(MSVC)
         set_target_properties(citra-qt PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS")
     elseif(MINGW)
@@ -284,15 +284,15 @@ endif()
 create_target_directory_groups(citra-qt)
 
 target_link_libraries(citra-qt PRIVATE audio_core citra_common citra_core input_common network video_core)
-target_link_libraries(citra-qt PRIVATE Boost::boost glad nihstro-headers Qt5::Widgets Qt5::Multimedia Qt5::Concurrent)
+target_link_libraries(citra-qt PRIVATE Boost::boost glad nihstro-headers Qt6::Widgets Qt6::Multimedia Qt6::Concurrent)
 target_link_libraries(citra-qt PRIVATE ${PLATFORM_LIBRARIES} Threads::Threads)
 
 if (NOT WIN32)
-    target_include_directories(citra-qt PRIVATE ${Qt5Gui_PRIVATE_INCLUDE_DIRS})
+    target_include_directories(citra-qt PRIVATE ${Qt6Gui_PRIVATE_INCLUDE_DIRS})
 endif()
 
 if (UNIX AND NOT APPLE)
-    target_link_libraries(citra-qt PRIVATE Qt5::DBus)
+    target_link_libraries(citra-qt PRIVATE Qt6::DBus)
 endif()
 
 target_compile_definitions(citra-qt PRIVATE
@@ -336,9 +336,9 @@ if(UNIX AND NOT APPLE)
 endif()
 
 if (MSVC)
-    include(CopyCitraQt5Deps)
+    include(CopyCitraQt6Deps)
     include(CopyCitraSDLDeps)
-    copy_citra_Qt5_deps(citra-qt)
+    copy_citra_Qt6_deps(citra-qt)
     copy_citra_SDL_deps(citra-qt)
     if (ENABLE_WEB_SERVICE AND OPENSSL_DLL_DIR)
         include(CopyCitraOpensslDeps)

src/citra_qt/bootmanager.cpp

@@ -533,7 +533,7 @@ void GRenderWindow::mouseReleaseEvent(QMouseEvent* event) {
 
 void GRenderWindow::TouchBeginEvent(const QTouchEvent* event) {
     // TouchBegin always has exactly one touch point, so take the .first()
-    const auto [x, y] = ScaleTouch(event->touchPoints().first().pos());
+    const auto [x, y] = ScaleTouch(event->points().first().position());
     this->TouchPressed(x, y);
 }
 
@@ -542,10 +542,10 @@ void GRenderWindow::TouchUpdateEvent(const QTouchEvent* event) {
     int active_points = 0;
 
     // average all active touch points
-    for (const auto& tp : event->touchPoints()) {
+    for (const auto& tp : event->points()) {
         if (tp.state() & (Qt::TouchPointPressed | Qt::TouchPointMoved | Qt::TouchPointStationary)) {
             active_points++;
-            pos += tp.pos();
+            pos += tp.position();
         }
     }
 

src/citra_qt/camera/qt_multimedia_camera.cpp

@@ -3,9 +3,8 @@
 // Refer to the license.txt file included.
 
 #include <QCamera>
-#include <QCameraInfo>
 #include <QImageReader>
-#include <QMessageBox>
+#include <QMediaDevices>
 #include <QThread>
 #include "citra_qt/camera/qt_multimedia_camera.h"
 #include "citra_qt/main.h"
@@ -16,229 +15,85 @@
 
 namespace Camera {
 
-QList<QVideoFrame::PixelFormat> QtCameraSurface::supportedPixelFormats(
+std::shared_ptr<QtMultimediaCameraHandler> QtMultimediaCameraHandlerFactory::Create(
-    [[maybe_unused]] QAbstractVideoBuffer::HandleType handleType) const {
-    return QList<QVideoFrame::PixelFormat>()
-           << QVideoFrame::Format_RGB32 << QVideoFrame::Format_RGB24
-           << QVideoFrame::Format_ARGB32_Premultiplied << QVideoFrame::Format_ARGB32
-           << QVideoFrame::Format_RGB565 << QVideoFrame::Format_RGB555
-           << QVideoFrame::Format_Jpeg
-           // the following formats are supported via Qt internal conversions
-           << QVideoFrame::Format_ARGB8565_Premultiplied << QVideoFrame::Format_BGRA32
-           << QVideoFrame::Format_BGRA32_Premultiplied << QVideoFrame::Format_BGR32
-           << QVideoFrame::Format_BGR24 << QVideoFrame::Format_BGR565 << QVideoFrame::Format_BGR555
-           << QVideoFrame::Format_AYUV444 << QVideoFrame::Format_YUV444
-           << QVideoFrame::Format_YUV420P << QVideoFrame::Format_YV12 << QVideoFrame::Format_UYVY
-           << QVideoFrame::Format_YUYV << QVideoFrame::Format_NV12
-           << QVideoFrame::Format_NV21; // Supporting all the QImage convertible formats, ordered by
-                                        // QImage decoding performance
-}
-
-bool QtCameraSurface::present(const QVideoFrame& frame) {
-    if (!frame.isValid()) {
-        return false;
-    }
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-    QMutexLocker locker(&mutex);
-    // In Qt 5.15, the image is already flipped
-    current_frame = frame.image();
-    locker.unlock();
-#else
-    QVideoFrame cloneFrame(frame);
-    cloneFrame.map(QAbstractVideoBuffer::ReadOnly);
-    const QImage image(cloneFrame.bits(), cloneFrame.width(), cloneFrame.height(),
-                       QVideoFrame::imageFormatFromPixelFormat(cloneFrame.pixelFormat()));
-    QMutexLocker locker(&mutex);
-    current_frame = image.mirrored(true, true);
-    locker.unlock();
-    cloneFrame.unmap();
-#endif
-    return true;
-}
-
-QtMultimediaCamera::QtMultimediaCamera(const std::string& camera_name,
-                                       const Service::CAM::Flip& flip)
-    : QtCameraInterface(flip), handler(QtMultimediaCameraHandler::GetHandler(camera_name)) {
-    if (handler->thread() == QThread::currentThread()) {
-        handler->CreateCamera(camera_name);
-    } else {
-        QMetaObject::invokeMethod(handler.get(), "CreateCamera", Qt::BlockingQueuedConnection,
-                                  Q_ARG(const std::string&, camera_name));
-    }
-}
-
-QtMultimediaCamera::~QtMultimediaCamera() {
-    handler->StopCamera();
-    QtMultimediaCameraHandler::ReleaseHandler(handler);
-}
-
-void QtMultimediaCamera::StartCapture() {
-    if (handler->thread() == QThread::currentThread()) {
-        handler->StartCamera();
-    } else {
-        QMetaObject::invokeMethod(handler.get(), "StartCamera", Qt::BlockingQueuedConnection);
-    }
-}
-
-void QtMultimediaCamera::StopCapture() {
-    handler->StopCamera();
-}
-
-void QtMultimediaCamera::SetFrameRate(Service::CAM::FrameRate frame_rate) {
-    const std::array<QCamera::FrameRateRange, 13> FrameRateList = {
-        /* Rate_15 */ QCamera::FrameRateRange(15, 15),
-        /* Rate_15_To_5 */ QCamera::FrameRateRange(5, 15),
-        /* Rate_15_To_2 */ QCamera::FrameRateRange(2, 15),
-        /* Rate_10 */ QCamera::FrameRateRange(10, 10),
-        /* Rate_8_5 */ QCamera::FrameRateRange(8.5, 8.5),
-        /* Rate_5 */ QCamera::FrameRateRange(5, 5),
-        /* Rate_20 */ QCamera::FrameRateRange(20, 20),
-        /* Rate_20_To_5 */ QCamera::FrameRateRange(5, 20),
-        /* Rate_30 */ QCamera::FrameRateRange(30, 30),
-        /* Rate_30_To_5 */ QCamera::FrameRateRange(5, 30),
-        /* Rate_15_To_10 */ QCamera::FrameRateRange(10, 15),
-        /* Rate_20_To_10 */ QCamera::FrameRateRange(10, 20),
-        /* Rate_30_To_10 */ QCamera::FrameRateRange(10, 30),
-    };
-
-    auto framerate = FrameRateList[static_cast<int>(frame_rate)];
-
-    if (handler->camera->supportedViewfinderFrameRateRanges().contains(framerate)) {
-        handler->settings.setMinimumFrameRate(framerate.minimumFrameRate);
-        handler->settings.setMaximumFrameRate(framerate.maximumFrameRate);
-    }
-}
-
-QImage QtMultimediaCamera::QtReceiveFrame() {
-    QMutexLocker locker(&handler->camera_surface.mutex);
-    return handler->camera_surface.current_frame;
-}
-
-bool QtMultimediaCamera::IsPreviewAvailable() {
-    return handler->CameraAvailable();
-}
-
-std::unique_ptr<CameraInterface> QtMultimediaCameraFactory::Create(const std::string& config,
-                                                                   const Service::CAM::Flip& flip) {
-    return std::make_unique<QtMultimediaCamera>(config, flip);
-}
-
-std::array<std::shared_ptr<QtMultimediaCameraHandler>, 3> QtMultimediaCameraHandler::handlers;
-
-std::array<bool, 3> QtMultimediaCameraHandler::status;
-
-std::unordered_map<std::string, std::shared_ptr<QtMultimediaCameraHandler>>
-    QtMultimediaCameraHandler::loaded;
-
-void QtMultimediaCameraHandler::Init() {
-    std::generate(std::begin(handlers), std::end(handlers),
-                  std::make_shared<QtMultimediaCameraHandler>);
-}
-
-std::shared_ptr<QtMultimediaCameraHandler> QtMultimediaCameraHandler::GetHandler(
     const std::string& camera_name) {
-    if (loaded.count(camera_name)) {
+    if (thread() == QThread::currentThread()) {
-        return loaded.at(camera_name);
+        std::shared_ptr<QtMultimediaCameraHandler> handler;
+        if (!handlers.contains(camera_name) || !(handler = handlers[camera_name].lock())) {
+            LOG_INFO(Service_CAM, "Creating new handler for camera '{}'", camera_name);
+            handler = std::make_shared<QtMultimediaCameraHandler>(camera_name);
+            handlers[camera_name] = handler;
+        } else {
+            LOG_INFO(Service_CAM, "Reusing existing handler for camera '{}'", camera_name);
         }
-    for (std::size_t i = 0; i < handlers.size(); i++) {
+        return handler;
-        if (!status[i]) {
+    } else {
-            LOG_INFO(Service_CAM, "Successfully got handler {}", i);
+        std::shared_ptr<QtMultimediaCameraHandler> handler;
-            status[i] = true;
+        QMetaObject::invokeMethod(this, "Create", Qt::BlockingQueuedConnection,
-            loaded.emplace(camera_name, handlers[i]);
+                                  Q_RETURN_ARG(std::shared_ptr<QtMultimediaCameraHandler>, handler),
-            return handlers[i];
+                                  Q_ARG(std::string, camera_name));
+        return handler;
     }
-    }
-    LOG_CRITICAL(Service_CAM, "All handlers taken up");
-    return nullptr;
 }
 
-void QtMultimediaCameraHandler::ReleaseHandler(
+void QtMultimediaCameraHandlerFactory::PauseCameras() {
-    const std::shared_ptr<Camera::QtMultimediaCameraHandler>& handler) {
+    LOG_INFO(Service_CAM, "Pausing all cameras");
-    for (std::size_t i = 0; i < handlers.size(); i++) {
+    for (auto& handler_pair : handlers) {
-        if (handlers[i] == handler) {
+        auto handler = handler_pair.second.lock();
-            LOG_INFO(Service_CAM, "Successfully released handler {}", i);
+        if (handler && handler->IsActive()) {
-            status[i] = false;
+            handler->PauseCapture();
-            handlers[i]->started = false;
-            for (auto it = loaded.begin(); it != loaded.end(); it++) {
-                if (it->second == handlers[i]) {
-                    loaded.erase(it);
-                    break;
-                }
-            }
-            break;
         }
     }
 }
 
-void QtMultimediaCameraHandler::CreateCamera(const std::string& camera_name) {
+void QtMultimediaCameraHandlerFactory::ResumeCameras() {
-    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
+    LOG_INFO(Service_CAM, "Resuming all cameras");
-    for (const QCameraInfo& cameraInfo : cameras) {
+    for (auto& handler_pair : handlers) {
-        if (cameraInfo.deviceName().toStdString() == camera_name)
+        auto handler = handler_pair.second.lock();
-            camera = std::make_unique<QCamera>(cameraInfo);
+        if (handler && handler->IsPaused()) {
+            handler->StartCapture();
         }
-    if (!camera) { // no cameras found, using default camera
+    }
+}
+
+QtMultimediaCameraHandler::QtMultimediaCameraHandler(const std::string& camera_name) {
+    auto cameras = QMediaDevices::videoInputs();
+    auto requested_camera =
+        std::find_if(cameras.begin(), cameras.end(), [camera_name](QCameraDevice& camera_info) {
+            return camera_info.description().toStdString() == camera_name;
+        });
+    if (requested_camera != cameras.end()) {
+        camera = std::make_unique<QCamera>(*requested_camera);
+    } else {
         camera = std::make_unique<QCamera>();
     }
-    settings.setMinimumFrameRate(30);
+    camera_surface = std::make_unique<QVideoSink>();
-    settings.setMaximumFrameRate(30);
+    capture_session.setVideoSink(camera_surface.get());
-    camera->setViewfinder(&camera_surface);
+    capture_session.setCamera(camera.get());
-    camera->load();
-    if (camera->supportedViewfinderPixelFormats().isEmpty()) {
-        // The gstreamer plugin (used on linux systems) returns an empty list on querying supported
-        // viewfinder pixel formats, and will not work without expliciting setting it to some value,
-        // so we are defaulting to RGB565 here which should be fairly widely supported.
-        settings.setPixelFormat(QVideoFrame::PixelFormat::Format_RGB565);
-    }
 }
 
-void QtMultimediaCameraHandler::StopCamera() {
+QtMultimediaCameraHandler::~QtMultimediaCameraHandler() {
-    camera->stop();
+    StopCapture();
-    started = false;
 }
 
-void QtMultimediaCameraHandler::StartCamera() {
+void QtMultimediaCameraHandler::StartCapture() {
+    if (!camera->isActive()) {
 #if defined(__APPLE__)
         if (!AppleAuthorization::CheckAuthorizationForCamera()) {
             LOG_ERROR(Service_CAM, "Unable to start camera due to lack of authorization");
             return;
         }
 #endif
-    camera->setViewfinderSettings(settings);
         camera->start();
-    started = true;
+    }
     paused = false;
 }
 
-bool QtMultimediaCameraHandler::CameraAvailable() const {
+void QtMultimediaCameraHandler::StopCapture() {
-    return camera && camera->isAvailable();
+    if (camera->isActive()) {
-}
+        camera->stop();
-
-void QtMultimediaCameraHandler::StopCameras() {
-    LOG_INFO(Service_CAM, "Stopping all cameras");
-    for (auto& handler : handlers) {
-        if (handler && handler->started) {
-            handler->StopCamera();
-            handler->paused = true;
-        }
-    }
-}
-
-void QtMultimediaCameraHandler::ResumeCameras() {
-    for (auto& handler : handlers) {
-        if (handler && handler->paused) {
-            handler->StartCamera();
-        }
-    }
-}
-
-void QtMultimediaCameraHandler::ReleaseHandlers() {
-    StopCameras();
-    LOG_INFO(Service_CAM, "Releasing all handlers");
-    for (std::size_t i = 0; i < handlers.size(); i++) {
-        status[i] = false;
-        handlers[i]->started = false;
-        handlers[i]->paused = false;
     }
+    paused = false;
 }
 
 } // namespace Camera

src/citra_qt/camera/qt_multimedia_camera.h

@@ -4,99 +4,113 @@
 
 #pragma once
 
-#include <array>
 #include <string>
 #include <unordered_map>
-#include <vector>
-#include <QAbstractVideoSurface>
 #include <QCamera>
-#include <QCameraViewfinderSettings>
 #include <QImage>
-#include <QMutex>
+#include <QMediaCaptureSession>
+#include <QVideoSink>
 #include "citra_qt/camera/camera_util.h"
 #include "citra_qt/camera/qt_camera_base.h"
 #include "core/frontend/camera/interface.h"
 
-class GMainWindow;
-
 namespace Camera {
 
-class QtCameraSurface final : public QAbstractVideoSurface {
+// NOTE: Must be created on the Qt thread. QtMultimediaCameraHandlerFactory ensures this.
+class QtMultimediaCameraHandler final : public QObject {
+    Q_OBJECT
+
 public:
-    QList<QVideoFrame::PixelFormat> supportedPixelFormats(
+    explicit QtMultimediaCameraHandler(const std::string& camera_name);
-        QAbstractVideoBuffer::HandleType) const override;
+    ~QtMultimediaCameraHandler();
-    bool present(const QVideoFrame&) override;
+
+    void StartCapture();
+    void StopCapture();
+
+    QImage QtReceiveFrame() {
+        return camera_surface->videoFrame().toImage();
+    }
+
+    bool IsPreviewAvailable() {
+        return camera->isAvailable();
+    }
+
+    bool IsActive() {
+        return camera->isActive();
+    }
+
+    [[nodiscard]] bool IsPaused() {
+        return paused;
+    }
+
+    void PauseCapture() {
+        StopCapture();
+        paused = true;
+    }
 
 private:
-    QMutex mutex;
+    std::unique_ptr<QCamera> camera;
-    QImage current_frame;
+    std::unique_ptr<QVideoSink> camera_surface;
-
+    QMediaCaptureSession capture_session{};
-    friend class QtMultimediaCamera; // For access to current_frame
+    bool paused = false; // was previously started but was paused, to be resumed
 };
 
-class QtMultimediaCameraHandler;
+// NOTE: Must be created on the Qt thread.
+class QtMultimediaCameraHandlerFactory final : public QObject {
+    Q_OBJECT
+
+public:
+    Q_INVOKABLE std::shared_ptr<QtMultimediaCameraHandler> Create(const std::string& camera_name);
+    void PauseCameras();
+    void ResumeCameras();
+
+private:
+    std::unordered_map<std::string, std::weak_ptr<QtMultimediaCameraHandler>> handlers;
+};
 
 /// This class is only an interface. It just calls QtMultimediaCameraHandler.
 class QtMultimediaCamera final : public QtCameraInterface {
 public:
-    QtMultimediaCamera(const std::string& camera_name, const Service::CAM::Flip& flip);
+    QtMultimediaCamera(const std::shared_ptr<QtMultimediaCameraHandler>& handler,
-    ~QtMultimediaCamera();
+                       const Service::CAM::Flip& flip)
-    void StartCapture() override;
+        : QtCameraInterface(flip), handler(handler) {}
-    void StopCapture() override;
+
-    void SetFrameRate(Service::CAM::FrameRate frame_rate) override;
+    void StartCapture() override {
-    QImage QtReceiveFrame() override;
+        handler->StartCapture();
-    bool IsPreviewAvailable() override;
+    }
+
+    void StopCapture() override {
+        handler->StopCapture();
+    }
+
+    void SetFrameRate(Service::CAM::FrameRate frame_rate) override {}
+
+    QImage QtReceiveFrame() override {
+        return handler->QtReceiveFrame();
+    }
+
+    bool IsPreviewAvailable() override {
+        return handler->IsPreviewAvailable();
+    }
 
 private:
     std::shared_ptr<QtMultimediaCameraHandler> handler;
 };
 
+/// This class is only an interface. It just calls QtMultimediaCameraHandlerFactory.
 class QtMultimediaCameraFactory final : public QtCameraFactory {
 public:
+    QtMultimediaCameraFactory(
+        const std::shared_ptr<QtMultimediaCameraHandlerFactory>& handler_factory)
+        : handler_factory(handler_factory) {}
+
     std::unique_ptr<CameraInterface> Create(const std::string& config,
-                                            const Service::CAM::Flip& flip) override;
+                                            const Service::CAM::Flip& flip) override {
-};
+        return std::make_unique<QtMultimediaCamera>(handler_factory->Create(config), flip);
-
+    }
-class QtMultimediaCameraHandler final : public QObject {
-    Q_OBJECT
-
-public:
-    /// Creates the global handler. Must be called in UI thread.
-    static void Init();
-    static std::shared_ptr<QtMultimediaCameraHandler> GetHandler(const std::string& camera_name);
-    static void ReleaseHandler(const std::shared_ptr<QtMultimediaCameraHandler>& handler);
-
-    /**
-     * Creates the camera.
-     * Note: This function must be called via QMetaObject::invokeMethod in UI thread.
-     */
-    Q_INVOKABLE void CreateCamera(const std::string& camera_name);
-
-    /**
-     * Starts the camera.
-     * Note: This function must be called via QMetaObject::invokeMethod in UI thread when
-     *       starting the camera for the first time. 'Resume' calls can be in other threads.
-     */
-    Q_INVOKABLE void StartCamera();
-
-    void StopCamera();
-    bool CameraAvailable() const;
-    static void StopCameras();
-    static void ResumeCameras();
-    static void ReleaseHandlers();
 
 private:
-    std::unique_ptr<QCamera> camera;
+    std::shared_ptr<QtMultimediaCameraHandlerFactory> handler_factory;
-    QtCameraSurface camera_surface{};
-    QCameraViewfinderSettings settings;
-    bool started = false;
-    bool paused = false; // was previously started but was paused, to be resumed
-
-    static std::array<std::shared_ptr<QtMultimediaCameraHandler>, 3> handlers;
-    static std::array<bool, 3> status;
-    static std::unordered_map<std::string, std::shared_ptr<QtMultimediaCameraHandler>> loaded;
-
-    friend class QtMultimediaCamera; // For access to camera_surface (and camera)
 };
 
 } // namespace Camera

src/citra_qt/configuration/configure_camera.cpp

@@ -2,16 +2,16 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <QCameraInfo>
+#include <QCameraDevice>
 #include <QDirIterator>
 #include <QFileDialog>
 #include <QImageReader>
+#include <QMediaDevices>
 #include <QMessageBox>
 #include <QWidget>
 #include "citra_qt/configuration/configure_camera.h"
 #include "common/settings.h"
 #include "core/frontend/camera/factory.h"
-#include "core/frontend/camera/interface.h"
 #include "core/hle/service/cam/cam.h"
 #include "ui_configure_camera.h"
 
@@ -32,9 +32,9 @@ ConfigureCamera::ConfigureCamera(QWidget* parent)
     camera_name = Settings::values.camera_name;
     camera_config = Settings::values.camera_config;
     camera_flip = Settings::values.camera_flip;
-    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
+    const QList<QCameraDevice> cameras = QMediaDevices::videoInputs();
-    for (const QCameraInfo& cameraInfo : cameras) {
+    for (const QCameraDevice& camera : cameras) {
-        ui->system_camera->addItem(cameraInfo.deviceName());
+        ui->system_camera->addItem(camera.description());
     }
     UpdateCameraMode();
     SetConfiguration();

src/citra_qt/configuration/configure_input.cpp

@@ -579,7 +579,7 @@ void ConfigureInput::AutoMap() {
 void ConfigureInput::HandleClick(QPushButton* button,
                                  std::function<void(const Common::ParamPackage&)> new_input_setter,
                                  InputCommon::Polling::DeviceType type) {
-    previous_key_code = QKeySequence(button->text())[0];
+    previous_key_code = QKeySequence(button->text())[0].toCombined();
     button->setText(tr("[press key]"));
     button->setFocus();
 

src/citra_qt/configuration/configure_motion_touch.cpp

@@ -234,6 +234,8 @@ void ConfigureMotionTouch::ConnectEvents() {
             &ConfigureMotionTouch::OnConfigureTouchCalibration);
     connect(ui->touch_from_button_config_btn, &QPushButton::clicked, this,
             &ConfigureMotionTouch::OnConfigureTouchFromButton);
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this,
+            &ConfigureMotionTouch::ApplyConfiguration);
     connect(ui->buttonBox, &QDialogButtonBox::rejected, this, [this] {
         if (CanCloseDialog()) {
             reject();

src/citra_qt/configuration/configure_motion_touch.ui

@@ -324,22 +324,4 @@
   </layout>
  </widget>
  <resources/>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>ConfigureMotionTouch</receiver>
-   <slot>ApplyConfiguration()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>220</x>
-     <y>380</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>220</x>
-     <y>200</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
 </ui>

src/citra_qt/configuration/configure_system.cpp

@@ -283,7 +283,7 @@ void ConfigureSystem::SetConfiguration() {
 
     ui->combo_init_clock->setCurrentIndex(static_cast<u8>(Settings::values.init_clock.GetValue()));
     QDateTime date_time;
-    date_time.setTime_t(Settings::values.init_time.GetValue());
+    date_time.setSecsSinceEpoch(Settings::values.init_time.GetValue());
     ui->edit_init_time->setDateTime(date_time);
 
     long long init_time_offset = Settings::values.init_time_offset.GetValue();
@@ -406,7 +406,7 @@ void ConfigureSystem::ApplyConfiguration() {
 
         Settings::values.init_clock =
             static_cast<Settings::InitClock>(ui->combo_init_clock->currentIndex());
-        Settings::values.init_time = ui->edit_init_time->dateTime().toTime_t();
+        Settings::values.init_time = ui->edit_init_time->dateTime().toSecsSinceEpoch();
 
         s64 time_offset_time = ui->edit_init_time_offset_time->time().msecsSinceStartOfDay() / 1000;
         s64 time_offset_days = ui->edit_init_time_offset_days->value() * 86400;

src/citra_qt/configuration/configure_touch_from_button.cpp

@@ -509,7 +509,8 @@ void TouchScreenPreview::mouseMoveEvent(QMouseEvent* event) {
     if (!coord_label) {
         return;
     }
-    const auto pos = MapToDeviceCoords(event->x(), event->y());
+    const auto point = event->position().toPoint();
+    const auto pos = MapToDeviceCoords(point.x(), point.y());
     if (pos) {
         coord_label->setText(QStringLiteral("X: %1, Y: %2").arg(pos->x()).arg(pos->y()));
     } else {
@@ -527,7 +528,8 @@ void TouchScreenPreview::mousePressEvent(QMouseEvent* event) {
     if (event->button() != Qt::MouseButton::LeftButton) {
         return;
     }
-    const auto pos = MapToDeviceCoords(event->x(), event->y());
+    const auto point = event->position().toPoint();
+    const auto pos = MapToDeviceCoords(point.x(), point.y());
     if (pos) {
         emit DotAdded(*pos);
     }
@@ -543,7 +545,7 @@ bool TouchScreenPreview::eventFilter(QObject* obj, QEvent* event) {
         emit DotSelected(obj->property(PropId).toInt());
 
         drag_state.dot = qobject_cast<QLabel*>(obj);
-        drag_state.start_pos = mouse_event->globalPos();
+        drag_state.start_pos = mouse_event->globalPosition().toPoint();
         return true;
     }
     case QEvent::Type::MouseMove: {
@@ -552,14 +554,13 @@ bool TouchScreenPreview::eventFilter(QObject* obj, QEvent* event) {
         }
         const auto mouse_event = static_cast<QMouseEvent*>(event);
         if (!drag_state.active) {
-            drag_state.active =
+            drag_state.active = (mouse_event->globalPosition().toPoint() - drag_state.start_pos)
-                (mouse_event->globalPos() - drag_state.start_pos).manhattanLength() >=
+                                    .manhattanLength() >= QApplication::startDragDistance();
-                QApplication::startDragDistance();
             if (!drag_state.active) {
                 break;
             }
         }
-        auto current_pos = mapFromGlobal(mouse_event->globalPos());
+        auto current_pos = mapFromGlobal(mouse_event->globalPosition().toPoint());
         current_pos.setX(std::clamp(current_pos.x(), contentsMargins().left(),
                                     contentsMargins().left() + contentsRect().width() - 1));
         current_pos.setY(std::clamp(current_pos.y(), contentsMargins().top(),

src/citra_qt/debugger/graphics/graphics_surface.cpp

@@ -40,8 +40,9 @@ void SurfacePicture::mousePressEvent(QMouseEvent* event) {
     }
 
     if (surface_widget) {
-        surface_widget->Pick(event->x() * pixmap.width() / width(),
+        const auto pos = event->position().toPoint();
-                             event->y() * pixmap.height() / height());
+        surface_widget->Pick(pos.x() * pixmap.width() / width(),
+                             pos.y() * pixmap.height() / height());
     }
 }
 

src/citra_qt/debugger/profiler.cpp

@@ -142,24 +142,28 @@ void MicroProfileWidget::hideEvent(QHideEvent* event) {
 }
 
 void MicroProfileWidget::mouseMoveEvent(QMouseEvent* event) {
-    MicroProfileMousePosition(event->x() / x_scale, event->y() / y_scale, 0);
+    const auto point = event->position().toPoint();
+    MicroProfileMousePosition(point.x() / x_scale, point.y() / y_scale, 0);
     event->accept();
 }
 
 void MicroProfileWidget::mousePressEvent(QMouseEvent* event) {
-    MicroProfileMousePosition(event->x() / x_scale, event->y() / y_scale, 0);
+    const auto point = event->position().toPoint();
+    MicroProfileMousePosition(point.x() / x_scale, point.y() / y_scale, 0);
     MicroProfileMouseButton(event->buttons() & Qt::LeftButton, event->buttons() & Qt::RightButton);
     event->accept();
 }
 
 void MicroProfileWidget::mouseReleaseEvent(QMouseEvent* event) {
-    MicroProfileMousePosition(event->x() / x_scale, event->y() / y_scale, 0);
+    const auto point = event->position().toPoint();
+    MicroProfileMousePosition(point.x() / x_scale, point.y() / y_scale, 0);
     MicroProfileMouseButton(event->buttons() & Qt::LeftButton, event->buttons() & Qt::RightButton);
     event->accept();
 }
 
 void MicroProfileWidget::wheelEvent(QWheelEvent* event) {
-    MicroProfileMousePosition(event->position().x() / x_scale, event->position().y() / y_scale,
+    const auto point = event->position().toPoint();
+    MicroProfileMousePosition(point.x() / x_scale, point.y() / y_scale,
                               event->angleDelta().y() / 120);
     event->accept();
 }

src/citra_qt/game_list.cpp

@@ -239,7 +239,8 @@ void GameList::OnTextChanged(const QString& new_text) {
                     file_path.mid(file_path.lastIndexOf(QLatin1Char{'/'}) + 1) + QLatin1Char{' '} +
                     file_title;
                 if (ContainsAllWords(file_name, edit_filter_text) ||
-                    (file_program_id.count() == 16 && edit_filter_text.contains(file_program_id))) {
+                    (file_program_id.length() == 16 &&
+                     edit_filter_text.contains(file_program_id))) {
                     tree_view->setRowHidden(j, folder_index, false);
                     ++result_count;
                 } else {
@@ -419,10 +420,10 @@ void GameList::DonePopulating(const QStringList& watch_list) {
     // Workaround: Add the watch paths in chunks to allow the gui to refresh
     // This prevents the UI from stalling when a large number of watch paths are added
     // Also artificially caps the watcher to a certain number of directories
-    constexpr int LIMIT_WATCH_DIRECTORIES = 5000;
+    constexpr qsizetype LIMIT_WATCH_DIRECTORIES = 5000;
     constexpr int SLICE_SIZE = 25;
-    int len = std::min(watch_list.length(), LIMIT_WATCH_DIRECTORIES);
+    const qsizetype len = std::min(watch_list.length(), LIMIT_WATCH_DIRECTORIES);
-    for (int i = 0; i < len; i += SLICE_SIZE) {
+    for (qsizetype i = 0; i < len; i += SLICE_SIZE) {
         watcher->addPaths(watch_list.mid(i, i + SLICE_SIZE));
         QCoreApplication::processEvents();
     }

src/citra_qt/hotkeys.cpp

@@ -26,7 +26,7 @@ void HotkeyRegistry::SaveHotkeys() {
 void HotkeyRegistry::LoadHotkeys() {
     // Make sure NOT to use a reference here because it would become invalid once we call
     // beginGroup()
-    for (auto shortcut : UISettings::values.shortcuts) {
+    for (const auto shortcut : UISettings::values.shortcuts) {
         Hotkey& hk = hotkey_groups[shortcut.group][shortcut.name];
         if (!shortcut.shortcut.keyseq.isEmpty()) {
             hk.keyseq =
@@ -40,7 +40,7 @@ void HotkeyRegistry::LoadHotkeys() {
     }
 }
 
-QShortcut* HotkeyRegistry::GetHotkey(const QString& group, const QString& action, QWidget* widget) {
+QShortcut* HotkeyRegistry::GetHotkey(const QString& group, const QString& action, QObject* widget) {
     Hotkey& hk = hotkey_groups[group][action];
 
     if (!hk.shortcut) {

src/citra_qt/hotkeys.h

@@ -47,7 +47,7 @@ public:
      *          will be the same. Thus, you shouldn't rely on the caller really being the
      *          QShortcut's parent.
      */
-    QShortcut* GetHotkey(const QString& group, const QString& action, QWidget* widget);
+    QShortcut* GetHotkey(const QString& group, const QString& action, QObject* widget);
 
     /**
      * Returns a QKeySequence object whose signal can be connected to QAction::setShortcut.

src/citra_qt/loading_screen.cpp

@@ -198,7 +198,7 @@ void LoadingScreen::OnLoadProgress(VideoCore::LoadCallbackStage stage, std::size
 
 void LoadingScreen::paintEvent(QPaintEvent* event) {
     QStyleOption opt;
-    opt.init(this);
+    opt.initFrom(this);
     QPainter p(this);
     style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
     QWidget::paintEvent(event);

src/citra_qt/loading_screen.h

@@ -73,5 +73,3 @@ private:
     std::chrono::duration<double> rolling_average = {};
     bool eta_shown = false;
 };
-
-Q_DECLARE_METATYPE(VideoCore::LoadCallbackStage);

src/citra_qt/main.cpp

@@ -5,7 +5,6 @@
 #include <clocale>
 #include <memory>
 #include <thread>
-#include <QDesktopWidget>
 #include <QFileDialog>
 #include <QFutureWatcher>
 #include <QLabel>
@@ -200,6 +199,11 @@ GMainWindow::GMainWindow()
     qRegisterMetaType<std::size_t>("std::size_t");
     qRegisterMetaType<Service::AM::InstallStatus>("Service::AM::InstallStatus");
 
+    // Register CameraFactory
+    qt_cameras = std::make_shared<Camera::QtMultimediaCameraHandlerFactory>();
+    Camera::RegisterFactory("image", std::make_unique<Camera::StillImageCameraFactory>());
+    Camera::RegisterFactory("qt", std::make_unique<Camera::QtMultimediaCameraFactory>(qt_cameras));
+
     LoadTranslation();
 
     Pica::g_debug_context = Pica::DebugContext::Construct();
@@ -647,7 +651,7 @@ void GMainWindow::ShowUpdaterWidgets() {
 
 void GMainWindow::SetDefaultUIGeometry() {
     // geometry: 55% of the window contents are in the upper screen half, 45% in the lower half
-    const QRect screenRect = QApplication::desktop()->screenGeometry(this);
+    const QRect screenRect = screen()->geometry();
 
     const int w = screenRect.width() * 2 / 3;
     const int h = screenRect.height() / 2;
@@ -1284,8 +1288,6 @@ void GMainWindow::ShutdownGame() {
 
     discord_rpc->Update();
 
-    Camera::QtMultimediaCameraHandler::ReleaseHandlers();
-
     // The emulation is stopped, so closing the window or not does not matter anymore
     disconnect(render_window, &GRenderWindow::Closed, this, &GMainWindow::OnStopGame);
     disconnect(secondary_window, &GRenderWindow::Closed, this, &GMainWindow::OnStopGame);
@@ -1344,7 +1346,7 @@ void GMainWindow::StoreRecentFile(const QString& filename) {
 
 void GMainWindow::UpdateRecentFiles() {
     const int num_recent_files =
-        std::min(UISettings::values.recent_files.size(), max_recent_files_item);
+        std::min(static_cast<int>(UISettings::values.recent_files.size()), max_recent_files_item);
 
     for (int i = 0; i < num_recent_files; i++) {
         const QString text = QStringLiteral("&%1. %2").arg(i + 1).arg(
@@ -1648,7 +1650,7 @@ void GMainWindow::InstallCIA(QStringList filepaths) {
     progress_bar->show();
     progress_bar->setMaximum(INT_MAX);
 
-    QtConcurrent::run([&, filepaths] {
+    (void)QtConcurrent::run([&, filepaths] {
         Service::AM::InstallStatus status;
         const auto cia_progress = [&](std::size_t written, std::size_t total) {
             emit UpdateProgress(written, total);
@@ -1724,7 +1726,7 @@ void GMainWindow::OnMenuRecentFile() {
 }
 
 void GMainWindow::OnStartGame() {
-    Camera::QtMultimediaCameraHandler::ResumeCameras();
+    qt_cameras->ResumeCameras();
 
     PreventOSSleep();
 
@@ -1751,7 +1753,7 @@ void GMainWindow::OnRestartGame() {
 
 void GMainWindow::OnPauseGame() {
     emu_thread->SetRunning(false);
-    Camera::QtMultimediaCameraHandler::StopCameras();
+    qt_cameras->PauseCameras();
 
     UpdateMenuState();
     AllowOSSleep();
@@ -2690,7 +2692,7 @@ void GMainWindow::SetDiscordEnabled([[maybe_unused]] bool state) {
 #undef main
 #endif
 
-static void SetHighDPIAttributes() {
+static Qt::HighDpiScaleFactorRoundingPolicy GetHighDpiRoundingPolicy() {
 #ifdef _WIN32
     // For Windows, we want to avoid scaling artifacts on fractional scaling ratios.
     // This is done by setting the optimal scaling policy for the primary screen.
@@ -2703,40 +2705,34 @@ static void SetHighDPIAttributes() {
     // Get the current screen geometry.
     const QScreen* primary_screen = QGuiApplication::primaryScreen();
     if (primary_screen == nullptr) {
-        return;
+        return Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
     }
 
     const QRect screen_rect = primary_screen->geometry();
-    const int real_width = screen_rect.width();
+    const qreal real_ratio = primary_screen->devicePixelRatio();
-    const int real_height = screen_rect.height();
+    const qreal real_width = std::trunc(screen_rect.width() * real_ratio);
-    const float real_ratio = primary_screen->logicalDotsPerInch() / 96.0f;
+    const qreal real_height = std::trunc(screen_rect.height() * real_ratio);
 
     // Recommended minimum width and height for proper window fit.
     // Any screen with a lower resolution than this will still have a scale of 1.
-    constexpr float minimum_width = 1350.0f;
+    constexpr qreal minimum_width = 1350.0;
-    constexpr float minimum_height = 900.0f;
+    constexpr qreal minimum_height = 900.0;
 
-    const float width_ratio = std::max(1.0f, real_width / minimum_width);
+    const qreal width_ratio = std::max(1.0, real_width / minimum_width);
-    const float height_ratio = std::max(1.0f, real_height / minimum_height);
+    const qreal height_ratio = std::max(1.0, real_height / minimum_height);
 
     // Get the lower of the 2 ratios and truncate, this is the maximum integer scale.
-    const float max_ratio = std::trunc(std::min(width_ratio, height_ratio));
+    const qreal max_ratio = std::trunc(std::min(width_ratio, height_ratio));
 
     if (max_ratio > real_ratio) {
-        QApplication::setHighDpiScaleFactorRoundingPolicy(
+        return Qt::HighDpiScaleFactorRoundingPolicy::Round;
-            Qt::HighDpiScaleFactorRoundingPolicy::Round);
     } else {
-        QApplication::setHighDpiScaleFactorRoundingPolicy(
+        return Qt::HighDpiScaleFactorRoundingPolicy::Floor;
-            Qt::HighDpiScaleFactorRoundingPolicy::Floor);
     }
 #else
     // Other OSes should be better than Windows at fractional scaling.
-    QApplication::setHighDpiScaleFactorRoundingPolicy(
+    return Qt::HighDpiScaleFactorRoundingPolicy::PassThrough;
-        Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
 #endif
-
-    QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
-    QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 }
 
 int main(int argc, char* argv[]) {
@@ -2748,16 +2744,14 @@ int main(int argc, char* argv[]) {
     QCoreApplication::setOrganizationName(QStringLiteral("Citra team"));
     QCoreApplication::setApplicationName(QStringLiteral("Citra"));
 
-    SetHighDPIAttributes();
+    auto rounding_policy = GetHighDpiRoundingPolicy();
+    QApplication::setHighDpiScaleFactorRoundingPolicy(rounding_policy);
 
 #ifdef __APPLE__
     std::string bin_path = FileUtil::GetBundleDirectory() + DIR_SEP + "..";
     chdir(bin_path.c_str());
 #endif
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
+
-    // Disables the "?" button on all dialogs. Disabled by default on Qt6.
-    QCoreApplication::setAttribute(Qt::AA_DisableWindowContextHelpButton);
-#endif
     QCoreApplication::setAttribute(Qt::AA_DontCheckOpenGLContextThreadAffinity);
     QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
     QApplication app(argc, argv);
@@ -2768,11 +2762,6 @@ int main(int argc, char* argv[]) {
 
     GMainWindow main_window;
 
-    // Register CameraFactory
-    Camera::RegisterFactory("image", std::make_unique<Camera::StillImageCameraFactory>());
-    Camera::RegisterFactory("qt", std::make_unique<Camera::QtMultimediaCameraFactory>());
-    Camera::QtMultimediaCameraHandler::Init();
-
     // Register frontend applets
     Frontend::RegisterDefaultApplets();
 

src/citra_qt/main.h

@@ -49,6 +49,10 @@ class RegistersWidget;
 class Updater;
 class WaitTreeWidget;
 
+namespace Camera {
+class QtMultimediaCameraHandlerFactory;
+}
+
 namespace DiscordRPC {
 class DiscordInterface;
 }
@@ -335,6 +339,8 @@ private:
 
     HotkeyRegistry hotkey_registry;
 
+    std::shared_ptr<Camera::QtMultimediaCameraHandlerFactory> qt_cameras;
+
 #ifdef __unix__
     QDBusObjectPath wake_lock{};
 #endif

src/citra_qt/multiplayer/direct_connect.cpp

@@ -5,7 +5,7 @@
 #include <QComboBox>
 #include <QFuture>
 #include <QIntValidator>
-#include <QRegExpValidator>
+#include <QRegularExpression>
 #include <QString>
 #include <QtConcurrent/QtConcurrentRun>
 #include "citra_qt/main.h"

src/citra_qt/multiplayer/validation.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <QRegExp>
+#include <QRegularExpression>
 #include <QString>
 #include <QValidator>
 
@@ -30,15 +30,17 @@ public:
 
 private:
     /// room name can be alphanumeric and " " "_" "." and "-" and must have a size of 4-20
-    QRegExp room_name_regex = QRegExp(QStringLiteral("^[a-zA-Z0-9._- ]{4,20}$"));
+    QRegularExpression room_name_regex =
-    QRegExpValidator room_name;
+        QRegularExpression(QStringLiteral("^[a-zA-Z0-9._\\- ]{4,20}$"));
+    QRegularExpressionValidator room_name;
 
     /// nickname can be alphanumeric and " " "_" "." and "-" and must have a size of 4-20
-    QRegExp nickname_regex = QRegExp(QStringLiteral("^[a-zA-Z0-9._- ]{4,20}$"));
+    QRegularExpression nickname_regex =
-    QRegExpValidator nickname;
+        QRegularExpression(QStringLiteral("^[a-zA-Z0-9._\\- ]{4,20}$"));
+    QRegularExpressionValidator nickname;
 
     /// ipv4 / ipv6 / hostnames
-    QRegExp ip_regex = QRegExp(QStringLiteral(
+    QRegularExpression ip_regex = QRegularExpression(QStringLiteral(
         // IPv4 regex
         "^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$|"
         // IPv6 regex
@@ -59,7 +61,7 @@ private:
         "\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:)))(%.+)?$|"
         // Hostname regex
         "^([a-zA-Z0-9]+(-[a-zA-Z0-9]+)*\\.)+[a-zA-Z]{2,}$"));
-    QRegExpValidator ip;
+    QRegularExpressionValidator ip;
 
     /// port must be between 0 and 65535
     QIntValidator port;

src/citra_qt/util/spinbox.cpp

@@ -30,7 +30,7 @@
 
 #include <cstdlib>
 #include <QLineEdit>
-#include <QRegExpValidator>
+#include <QRegularExpression>
 #include "citra_qt/util/spinbox.h"
 #include "common/assert.h"
 
@@ -244,14 +244,15 @@ QValidator::State CSpinBox::validate(QString& input, int& pos) const {
     }
 
     // Match string
-    QRegExp num_regexp(regexp);
+    QRegularExpression num_regexp(QRegularExpression::anchoredPattern(regexp));
     int num_pos = strpos;
     QString sub_input = input.mid(strpos, input.length() - strpos - suffix.length());
 
-    if (!num_regexp.exactMatch(sub_input) && num_regexp.matchedLength() == 0)
+    auto match = num_regexp.match(sub_input);
+    if (!match.hasMatch())
         return QValidator::Invalid;
 
-    sub_input = sub_input.left(num_regexp.matchedLength());
+    sub_input = sub_input.left(match.capturedLength());
     bool ok;
     qint64 val = sub_input.toLongLong(&ok, base);
 
@@ -263,7 +264,7 @@ QValidator::State CSpinBox::validate(QString& input, int& pos) const {
         return QValidator::Invalid;
 
     // Make sure we are actually at the end of this string...
-    strpos += num_regexp.matchedLength();
+    strpos += match.capturedLength();
 
     if (!suffix.isEmpty() && input.mid(strpos) != suffix) {
         return QValidator::Invalid;

src/core/loader/smdh.cpp

@@ -44,11 +44,11 @@ std::vector<u16> SMDH::GetIcon(bool large) const {
     return icon;
 }
 
-std::array<u16, 0x40> SMDH::GetShortTitle(Loader::SMDH::TitleLanguage language) const {
+std::array<char16_t, 0x40> SMDH::GetShortTitle(Loader::SMDH::TitleLanguage language) const {
     return titles[static_cast<int>(language)].short_title;
 }
 
-std::array<u16, 0x80> SMDH::GetLongTitle(Loader::SMDH::TitleLanguage language) const {
+std::array<char16_t, 0x80> SMDH::GetLongTitle(Loader::SMDH::TitleLanguage language) const {
     return titles[static_cast<int>(language)].long_title;
 }
 

src/core/loader/smdh.h

@@ -26,9 +26,9 @@ struct SMDH {
     INSERT_PADDING_BYTES(2);
 
     struct Title {
-        std::array<u16, 0x40> short_title;
+        std::array<char16_t, 0x40> short_title;
-        std::array<u16, 0x80> long_title;
+        std::array<char16_t, 0x80> long_title;
-        std::array<u16, 0x40> publisher;
+        std::array<char16_t, 0x40> publisher;
     };
     std::array<Title, 16> titles;
 
@@ -88,14 +88,14 @@ struct SMDH {
      * @param language title language
      * @return UTF-16 array of the short title
      */
-    std::array<u16, 0x40> GetShortTitle(Loader::SMDH::TitleLanguage language) const;
+    std::array<char16_t, 0x40> GetShortTitle(Loader::SMDH::TitleLanguage language) const;
 
     /**
      * Gets the long game title from SMDH
      * @param language title language
      * @return UTF-16 array of the long title
      */
-    std::array<u16, 0x80> GetLongTitle(Loader::SMDH::TitleLanguage language) const;
+    std::array<char16_t, 0x80> GetLongTitle(Loader::SMDH::TitleLanguage language) const;
 
     std::vector<GameRegion> GetRegions() const;
 };