core: fix reported display resolutions when fractionally scaled

Qt appears to have no way to retrieve the pixel size sent by wayland,
as it overrides it with the logical size and will not return the
physical one.

CMakeLists.txt

@@ -9,7 +9,7 @@ project(hsi VERSION ${VER} LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt6 6.5 REQUIRED COMPONENTS Widgets Quick QuickControls2)
+find_package(Qt6 6.5 REQUIRED COMPONENTS Widgets Quick QuickControls2 WaylandClient)
 find_package(PkgConfig REQUIRED)
 
 pkg_check_modules(hyprutils REQUIRED IMPORTED_TARGET hyprutils)

src/CMakeLists.txt

@@ -3,6 +3,7 @@ qt_add_executable(hyprsysteminfo
     util/Utils.cpp
     SystemInfo.cpp
     SystemIconProvider.cpp
+    WaylandScreen.cpp
 )
 
 qt_add_qml_module(hyprsysteminfo
@@ -11,4 +12,6 @@ qt_add_qml_module(hyprsysteminfo
     QML_FILES main.qml
 )
 
-target_link_libraries(hyprsysteminfo PRIVATE Qt6::Widgets Qt6::QuickControls2 PkgConfig::hyprutils)
+target_link_libraries(hyprsysteminfo PRIVATE
+    Qt6::Widgets Qt6::QuickControls2 Qt6::WaylandClientPrivate PkgConfig::hyprutils
+)

src/SystemInfo.cpp

@@ -1,4 +1,5 @@
 #include "SystemInfo.hpp"
+#include "WaylandScreen.hpp"
 #include "util/Utils.hpp"
 #include <qclipboard.h>
 #include <array>
@@ -190,9 +191,8 @@ CSystemInternals::CSystemInternals(QObject* parent) : QObject(parent) {
 
     {
         std::string screens;
-        for (auto* s : QGuiApplication::screens()) {
-            auto ratio = s->devicePixelRatio();
-            screens += std::format("{} ({}x{}), ", s->name().toStdString(), s->size().width() * ratio, s->size().height() * ratio);
+        for (const auto& s : SWaylandScreenInfo::enumerateScreens()) {
+            screens += std::format("{} ({}x{}), ", s.name.toStdString(), s.pixelSize.width(), s.pixelSize.height());
         }
 
         if (!screens.empty())

src/WaylandScreen.cpp

@@ -0,0 +1,55 @@
+#include "WaylandScreen.hpp"
+
+#include <QtWaylandClient/private/qwayland-wayland.h>
+#include <QtWaylandClient/private/qwaylanddisplay_p.h>
+#include <QtWaylandClient/private/qwaylandintegration_p.h>
+#include <cstdint>
+#include <qcontainerfwd.h>
+#include <qsize.h>
+#include <qstringliteral.h>
+#include <qtclasshelpermacros.h>
+#include <vector>
+
+using namespace QtWaylandClient;
+
+class CWaylandScreen : public QtWayland::wl_output {
+  public:
+    explicit CWaylandScreen(QWaylandDisplay* display, uint32_t version, uint32_t id);
+    Q_DISABLE_COPY_MOVE(CWaylandScreen);
+    SWaylandScreenInfo info;
+
+  protected:
+    void output_mode(uint32_t flags, int32_t width, int32_t height, int32_t refresh) override;
+    void output_name(const QString& name) override;
+};
+
+std::vector<SWaylandScreenInfo> SWaylandScreenInfo::enumerateScreens() {
+    auto*                        display = QWaylandIntegration::instance()->display();
+
+    std::vector<CWaylandScreen*> screens;
+    for (const auto& global : display->globals()) {
+        if (global.interface == QStringLiteral("wl_output")) {
+            screens.emplace_back(new CWaylandScreen(display, global.version, global.id));
+        }
+    }
+
+    display->forceRoundTrip();
+
+    std::vector<SWaylandScreenInfo> info;
+    for (auto* screen : screens) {
+        info.push_back(screen->info);
+        delete screen;
+    }
+
+    return info;
+}
+
+CWaylandScreen::CWaylandScreen(QWaylandDisplay* display, uint32_t version, uint32_t id) : QtWayland::wl_output(display->wl_registry(), id, 4u) {}
+
+void CWaylandScreen::output_mode(uint32_t flags, int width, int height, int refresh) {
+    info.pixelSize = QSize(width, height);
+}
+
+void CWaylandScreen::output_name(const QString& name) {
+    info.name = name;
+}

src/WaylandScreen.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <qcontainerfwd.h>
+#include <qsize.h>
+#include <qstring.h>
+#include <qcontainerfwd.h>
+#include <vector>
+
+struct SWaylandScreenInfo {
+    QString                                name;
+    QSize                                  pixelSize;
+
+    static std::vector<SWaylandScreenInfo> enumerateScreens();
+};