3 files changed, 17 insertions, 15 deletions

diff --git a/indra/llwindow/llwindowcallbacks.cpp b/indra/llwindow/llwindowcallbacks.cpp
index 474953d3a4..7e90ade423 100644
--- a/indra/llwindow/llwindowcallbacks.cpp
+++ b/indra/llwindow/llwindowcallbacks.cpp
@@ -175,9 +175,9 @@ BOOL LLWindowCallbacks::handleDeviceChange(LLWindow *window)
 	return FALSE;
 }
 
-void LLWindowCallbacks::handleDPIChanged(LLWindow *window, F32 ui_scale_factor, S32 window_width, S32 window_height)
+BOOL LLWindowCallbacks::handleDPIChanged(LLWindow *window, F32 ui_scale_factor, S32 window_width, S32 window_height)
 {
-
+	return FALSE;
 }
 
 void LLWindowCallbacks::handlePingWatchdog(LLWindow *window, const char * msg)
diff --git a/indra/llwindow/llwindowcallbacks.h b/indra/llwindow/llwindowcallbacks.h
index de789a71d9..47d5a18858 100644
--- a/indra/llwindow/llwindowcallbacks.h
+++ b/indra/llwindow/llwindowcallbacks.h
@@ -65,7 +65,7 @@ public:
 	virtual void handleDataCopy(LLWindow *window, S32 data_type, void *data);
 	virtual BOOL handleTimerEvent(LLWindow *window);
 	virtual BOOL handleDeviceChange(LLWindow *window);
-	virtual void handleDPIChanged(LLWindow *window, F32 ui_scale_factor, S32 window_width, S32 window_height);
+	virtual BOOL handleDPIChanged(LLWindow *window, F32 ui_scale_factor, S32 window_width, S32 window_height);
 
 	enum DragNDropAction {
 		DNDA_START_TRACKING = 0,// Start tracking an incoming drag
diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 4086db8e52..321792eb14 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -2623,19 +2623,21 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 		case WM_DPICHANGED:
 			{
 				LPRECT lprc_new_scale;
-				F32 new_scale = LOWORD(w_param) / USER_DEFAULT_SCREEN_DPI;
+				F32 new_scale = F32(LOWORD(w_param)) / F32(USER_DEFAULT_SCREEN_DPI);
 				lprc_new_scale = (LPRECT)l_param;
 				S32 new_width = lprc_new_scale->right - lprc_new_scale->left;
 				S32 new_height = lprc_new_scale->bottom - lprc_new_scale->top;
-				window_imp->mCallbacks->handleDPIChanged(window_imp, new_scale, new_width, new_height);
-				SetWindowPos(h_wnd,
-					HWND_TOP,
-					lprc_new_scale->left,
-					lprc_new_scale->top,
-					new_width,
-					new_height,
-					SWP_NOZORDER | SWP_NOACTIVATE);
-					return 0;
+				if (window_imp->mCallbacks->handleDPIChanged(window_imp, new_scale, new_width, new_height))
+				{
+					SetWindowPos(h_wnd,
+						HWND_TOP,
+						lprc_new_scale->left,
+						lprc_new_scale->top,
+						new_width,
+						new_height,
+						SWP_NOZORDER | SWP_NOACTIVATE);
+				}
+				return 0;
 			}
 
 		case WM_SETFOCUS:
@@ -3982,7 +3984,7 @@ F32 LLWindowWin32::getSystemUISize()
 				hr = pGDFM(hMonitor, MDT_EFFECTIVE_DPI, &dpix, &dpiy);
 				if (hr == S_OK)
 				{
-					scale_value = dpix / USER_DEFAULT_SCREEN_DPI;
+					scale_value = F32(dpix) / F32(USER_DEFAULT_SCREEN_DPI);
 				}
 				else
 				{
@@ -4001,7 +4003,7 @@ F32 LLWindowWin32::getSystemUISize()
 	else
 	{
 		LL_WARNS() << "Could not load shcore.dll library (included by <ShellScalingAPI.h> from Win 8.1 SDK). Using legacy DPI awareness API of Win XP/7" << LL_ENDL;
-		scale_value = GetDeviceCaps(hdc, LOGPIXELSX) / USER_DEFAULT_SCREEN_DPI;
+		scale_value = F32(GetDeviceCaps(hdc, LOGPIXELSX)) / F32(USER_DEFAULT_SCREEN_DPI);
 	}
 
 	ReleaseDC(hWnd, hdc);