From c3a86b04820114e3bbf82169ebb01fc7d6443ebc Mon Sep 17 00:00:00 2001
From: Cacodemon345 <wahil1976@outlook.com>
Date: Thu, 10 Feb 2022 12:59:33 +0600
Subject: [PATCH 1/2] qt: Use non-integer HiDPI scaling on Qt 5

---
 src/qt/qt_main.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/qt/qt_main.cpp b/src/qt/qt_main.cpp
index ebeef8102..51412dab7 100644
--- a/src/qt/qt_main.cpp
+++ b/src/qt/qt_main.cpp
@@ -134,6 +134,7 @@ int main(int argc, char* argv[]) {
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
     QApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 #endif
+    QApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
     QApplication app(argc, argv);
     qt_set_sequence_auto_mnemonic(false);
     Q_INIT_RESOURCE(qt_resources);

From 775dad5fa3803541df067add30385c5f982fa937 Mon Sep 17 00:00:00 2001
From: Cacodemon345 <wahil1976@outlook.com>
Date: Thu, 10 Feb 2022 15:30:39 +0600
Subject: [PATCH 2/2] qt: Use QDesktopWidget for screen retrival

---
 src/qt/qt_mainwindow.cpp    |  5 +++--
 src/qt/qt_rendererstack.cpp |  3 ++-
 src/qt/qt_util.cpp          | 13 +++++++++++++
 src/qt/qt_util.hpp          |  6 +++++-
 4 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/qt/qt_mainwindow.cpp b/src/qt/qt_mainwindow.cpp
index 1eead1845..66f8d8b03 100644
--- a/src/qt/qt_mainwindow.cpp
+++ b/src/qt/qt_mainwindow.cpp
@@ -68,6 +68,7 @@ extern "C" {
 #include "qt_settings.hpp"
 #include "qt_machinestatus.hpp"
 #include "qt_mediamenu.hpp"
+#include "qt_util.hpp"
 
 #ifdef __unix__
 #ifdef WAYLAND
@@ -184,9 +185,9 @@ MainWindow::MainWindow(QWidget *parent) :
 
     connect(this, &MainWindow::resizeContents, this, [this](int w, int h) {
         if (!QApplication::platformName().contains("eglfs") && vid_resize == 0) {
-            w = w / (!dpi_scale ? this->screen()->devicePixelRatio() : 1);
+            w = w / (!dpi_scale ? util::screenOfWidget(this)->devicePixelRatio() : 1);
             
-            int modifiedHeight = (h / (!dpi_scale ? this->screen()->devicePixelRatio() : 1))
+            int modifiedHeight = (h / (!dpi_scale ? util::screenOfWidget(this)->devicePixelRatio() : 1))
                 + menuBar()->height()
                 + (statusBar()->height() * !hide_status_bar)
                 + (ui->toolBar->height() * !hide_tool_bar);
diff --git a/src/qt/qt_rendererstack.cpp b/src/qt/qt_rendererstack.cpp
index eff53d441..52d82fc92 100644
--- a/src/qt/qt_rendererstack.cpp
+++ b/src/qt/qt_rendererstack.cpp
@@ -25,6 +25,7 @@
 #include "qt_hardwarerenderer.hpp"
 
 #include "qt_mainwindow.hpp"
+#include "qt_util.hpp"
 
 #include "evdev_mouse.hpp"
 
@@ -173,7 +174,7 @@ void RendererStack::mouseMoveEvent(QMouseEvent *event)
         ignoreNextMouseEvent--;
     }
     else if (event->globalPos().x() == 0 || event->globalPos().y() == 0) leaveEvent((QEvent*)event);
-    else if (event->globalPos().x() == (screen()->geometry().width() - 1) || event->globalPos().y() == (screen()->geometry().height() - 1)) leaveEvent((QEvent*)event);
+    else if (event->globalPos().x() == (util::screenOfWidget(this)->geometry().width() - 1) || event->globalPos().y() == (util::screenOfWidget(this)->geometry().height() - 1)) leaveEvent((QEvent*)event);
     oldPos = event->pos();
 #endif
 }
diff --git a/src/qt/qt_util.cpp b/src/qt/qt_util.cpp
index 96a60004b..771c6d94a 100644
--- a/src/qt/qt_util.cpp
+++ b/src/qt/qt_util.cpp
@@ -16,10 +16,23 @@
  */
 #include <QStringBuilder>
 #include <QStringList>
+#include <QWidget>
+#include <QApplication>
+#if QT_VERSION <= QT_VERSION_CHECK(5, 14, 0)
+#include <QDesktopWidget>
+#endif
 #include "qt_util.hpp"
 
 namespace util
 {
+    QScreen* screenOfWidget(QWidget* widget)
+    {
+#if QT_VERSION <= QT_VERSION_CHECK(5, 14, 0)
+        return QApplication::screens()[QApplication::desktop()->screenNumber(widget) == -1 ? 0 : QApplication::desktop()->screenNumber(widget)];
+#else
+        return widget->screen();
+#endif
+    }
 
     QString DlgFilter(std::initializer_list<QString> extensions, bool last)
     {
diff --git a/src/qt/qt_util.hpp b/src/qt/qt_util.hpp
index ab2284e4b..4e62c8e12 100644
--- a/src/qt/qt_util.hpp
+++ b/src/qt/qt_util.hpp
@@ -2,13 +2,17 @@
 #define QT_UTIL_HPP
 
 #include <QString>
+#include <QWidget>
 
 #include <initializer_list>
 
+class QScreen;
 namespace util
 {
     /* Creates extension list for qt filedialog */
     QString DlgFilter(std::initializer_list<QString> extensions, bool last = false);
+    /* Returns screen the widget is on */
+    QScreen* screenOfWidget(QWidget* widget);
 };
 
-#endif
\ No newline at end of file
+#endif