From 12f0dd7c60ef0f5baa6af2a2b5dc06fc2eab576c Mon Sep 17 00:00:00 2001
From: Ansariel <none@none>
Date: Sat, 19 Nov 2016 12:05:40 +0100
Subject: [PATCH] Fix DPI scaling calculation

---
 indra/llwindow/llwindowwin32.cpp | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 8ef742262a..f55be68520 100644
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -2644,7 +2644,10 @@ 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;
+				// <FS:Ansariel> Fix DPI scaling
+				//F32 new_scale = LOWORD(w_param) / USER_DEFAULT_SCREEN_DPI;
+				F32 new_scale = F32(LOWORD(w_param)) / F32(USER_DEFAULT_SCREEN_DPI);
+				// </FS:Ansariel>
 				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;
@@ -4060,7 +4063,10 @@ F32 LLWindowWin32::getSystemUISize()
 				hr = pGDFM(hMonitor, MDT_EFFECTIVE_DPI, &dpix, &dpiy);
 				if (hr == S_OK)
 				{
-					scale_value = dpix / USER_DEFAULT_SCREEN_DPI;
+					// <FS:Ansariel> Fix DPI scaling
+					//scale_value = dpix / USER_DEFAULT_SCREEN_DPI;
+					scale_value = F32(dpix) / F32(USER_DEFAULT_SCREEN_DPI);
+					// </FS:Ansariel>
 				}
 				else
 				{
@@ -4079,7 +4085,10 @@ 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;
+		// <FS:Ansariel> Fix DPI scaling
+		//scale_value = GetDeviceCaps(hdc, LOGPIXELSX) / USER_DEFAULT_SCREEN_DPI;
+		scale_value = F32(GetDeviceCaps(hdc, LOGPIXELSX)) / F32(USER_DEFAULT_SCREEN_DPI);
+		// </FS:Ansariel>
 	}
 
 	ReleaseDC(hWnd, hdc);