Windows QPA: Reimplement calculation of window frames

Instead of relying on AdjustWindowRectEx() and dirty-handling,
capture the rectangles before and after the processing of
WM_NCCALCSIZE and calculate the frame from that. This allows
for changing window frames by handling WM_NCCALCSIZE and
monitor-dependent window frames when using High DPI scaling.

Task-number: QTBUG-53255
Task-number: QTBUG-40578
Task-number: QTBUG-56591
Change-Id: If8364a5440a6324ea5d470bf5b74e68942285abe
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/plugins/platforms/windows/qwindowscontext.h b/src/plugins/platforms/windows/qwindowscontext.h
index 9dfde67797..41405f8efc 100644
--- a/src/plugins/platforms/windows/qwindowscontext.h
+++ b/src/plugins/platforms/windows/qwindowscontext.h
@@ -181,12 +181,14 @@ public:
 
     inline bool windowsProc(HWND hwnd, UINT message,
                             QtWindows::WindowsEventType et,
-                            WPARAM wParam, LPARAM lParam, LRESULT *result);
+                            WPARAM wParam, LPARAM lParam, LRESULT *result,
+                            QWindowsWindow **platformWindowPtr);
 
     QWindow *keyGrabber() const;
     void setKeyGrabber(QWindow *hwnd);
 
     void setWindowCreationContext(const QSharedPointer<QWindowCreationContext> &ctx);
+    QSharedPointer<QWindowCreationContext> windowCreationContext() const;
 
     void setTabletAbsoluteRange(int a);
     void setProcessDpiAwareness(QtWindows::ProcessDpiAwareness dpiAwareness);