From 7415964a4df4ff1618fdc251401c208112aa0b40 Mon Sep 17 00:00:00 2001
From: Michael Lutz <michi@icosahedron.de>
Date: Sat, 16 Jan 2021 16:31:08 +0100
Subject: Codechange: [Win32] Remove Windows 95 specific mouse tracking
 work-around.

---
 src/video/win32_v.cpp | 49 +++++++------------------------------------------
 1 file changed, 7 insertions(+), 42 deletions(-)

(limited to 'src/video')

diff --git a/src/video/win32_v.cpp b/src/video/win32_v.cpp
index e7e89fd73..a9dbd8589 100644
--- a/src/video/win32_v.cpp
+++ b/src/video/win32_v.cpp
@@ -39,9 +39,6 @@
 #define PM_QS_INPUT 0x20000
 #endif
 
-typedef BOOL (WINAPI *PFNTRACKMOUSEEVENT)(LPTRACKMOUSEEVENT lpEventTrack);
-static PFNTRACKMOUSEEVENT _pTrackMouseEvent = nullptr;
-
 static struct {
 	HWND main_wnd;        ///< Handle to system window.
 	HBITMAP dib_sect;     ///< System bitmap object referencing our rendering buffer.
@@ -229,31 +226,6 @@ int RedrawScreenDebug()
 }
 #endif
 
-/* Windows 95 will not have a WM_MOUSELEAVE message, so define it if needed */
-#if !defined(WM_MOUSELEAVE)
-#define WM_MOUSELEAVE 0x02A3
-#endif
-#define TID_POLLMOUSE 1
-#define MOUSE_POLL_DELAY 75
-
-static void CALLBACK TrackMouseTimerProc(HWND hwnd, UINT msg, UINT_PTR event, DWORD time)
-{
-	RECT rc;
-	POINT pt;
-
-	/* Get the rectangle of our window and translate it to screen coordinates.
-	 * Compare this with the current screen coordinates of the mouse and if it
-	 * falls outside of the area or our window we have left the window. */
-	GetClientRect(hwnd, &rc);
-	MapWindowPoints(hwnd, HWND_DESKTOP, (LPPOINT)(LPRECT)&rc, 2);
-	GetCursorPos(&pt);
-
-	if (!PtInRect(&rc, pt) || (WindowFromPoint(pt) != hwnd)) {
-		KillTimer(hwnd, event);
-		PostMessage(hwnd, WM_MOUSELEAVE, 0, 0L);
-	}
-}
-
 /**
  * Instantiate a new window.
  * @param full_screen Whether to make a full screen window or not.
@@ -633,7 +605,7 @@ static LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lP
 
 	switch (msg) {
 		case WM_CREATE:
-			SetTimer(hwnd, TID_POLLMOUSE, MOUSE_POLL_DELAY, TrackMouseTimerProc);
+			_cursor.in_window = false; // Win32 has mouse tracking.
 			SetCompositionPos(hwnd);
 			_imm_props = ImmGetProperty(GetKeyboardLayout(0), IGP_PROPERTY);
 			break;
@@ -730,16 +702,12 @@ static LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lP
 			 * tracking the mouse for exiting the window */
 			if (!_cursor.in_window) {
 				_cursor.in_window = true;
-				if (_pTrackMouseEvent != nullptr) {
-					TRACKMOUSEEVENT tme;
-					tme.cbSize = sizeof(tme);
-					tme.dwFlags = TME_LEAVE;
-					tme.hwndTrack = hwnd;
-
-					_pTrackMouseEvent(&tme);
-				} else {
-					SetTimer(hwnd, TID_POLLMOUSE, MOUSE_POLL_DELAY, TrackMouseTimerProc);
-				}
+				TRACKMOUSEEVENT tme;
+				tme.cbSize = sizeof(tme);
+				tme.dwFlags = TME_LEAVE;
+				tme.hwndTrack = hwnd;
+
+				TrackMouseEvent(&tme);
 			}
 
 			if (_cursor.fix_at) {
@@ -1024,9 +992,6 @@ static void RegisterWndClass()
 
 		registered = true;
 		if (!RegisterClass(&wnd)) usererror("RegisterClass failed");
-
-		/* Dynamically load mouse tracking, as it doesn't exist on Windows 95. */
-		_pTrackMouseEvent = (PFNTRACKMOUSEEVENT)GetProcAddress(GetModuleHandle(_T("User32")), "TrackMouseEvent");
 	}
 }
 
-- 
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