From da5d71c23c31e89db59006183a3572d35e3c85d1 Mon Sep 17 00:00:00 2001
From: borgmanJeremy <46930769+borgmanJeremy@users.noreply.github.com>
Date: Fri, 24 Dec 2021 14:36:39 -0600
Subject: [PATCH] Fixed an issue where the magnifier did not account for hiDPI
 on retina screens (#2187)

---
 src/widgets/panel/colorgrabwidget.cpp | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/widgets/panel/colorgrabwidget.cpp b/src/widgets/panel/colorgrabwidget.cpp
index 59a56ef3..1d817528 100644
--- a/src/widgets/panel/colorgrabwidget.cpp
+++ b/src/widgets/panel/colorgrabwidget.cpp
@@ -200,11 +200,26 @@ void ColorGrabWidget::updateWidget()
     float zoom = m_extraZoomActive ? ZOOM2 : ZOOM1;
     // Set window size and move its center to the mouse cursor
     QRect rect(0, 0, width, width);
+
+    auto realCursorPos = cursorPos();
+    auto adjustedCursorPos = realCursorPos;
+
+#if defined(Q_OS_MACOS)
+    QScreen* currentScreen = QGuiAppCurrentScreen().currentScreen();
+    if (currentScreen) {
+        adjustedCursorPos =
+          QPoint((realCursorPos.x() - currentScreen->geometry().x()) *
+                   currentScreen->devicePixelRatio(),
+                 (realCursorPos.y() - currentScreen->geometry().y()) *
+                   currentScreen->devicePixelRatio());
+    }
+#endif
+
     rect.moveCenter(cursorPos());
     setGeometry(rect);
     // Store a pixmap containing the zoomed-in section around the cursor
     QRect sourceRect(0, 0, width / zoom, width / zoom);
-    sourceRect.moveCenter(rect.center());
+    sourceRect.moveCenter(adjustedCursorPos);
     m_previewImage = m_pixmap->copy(sourceRect).toImage();
     // Repaint
     update();