remove *very* old support code for mouse wheels

src/lib/synwinhk/synwinhk.cpp

@@ -68,7 +68,6 @@ setImmuneKeys(const DWORD *list, std::size_t size)
 
 #include "barrier/protocol_types.h"
 
-#include <zmouse.h>
 #include <tchar.h>
  
 #undef assert
@@ -93,7 +92,6 @@ setImmuneKeys(const DWORD *list, std::size_t size)
 
 enum EWheelSupport {
     kWheelNone,
-    kWheelOld,
     kWheelWin2000,
     kWheelModern
 };
@@ -116,8 +114,6 @@ typedef struct tagMOUSEHOOKSTRUCTWin2000 {
 
 static HINSTANCE        g_hinstance       = NULL;
 static DWORD            g_processID       = 0;
-static EWheelSupport    g_wheelSupport    = kWheelNone;
-static UINT                g_wmMouseWheel    = 0;
 static DWORD            g_threadID        = 0;
 static HHOOK            g_getMessage      = NULL;
 static HHOOK            g_keyboardLL      = NULL;
@@ -578,19 +574,6 @@ getMessageHook(int code, WPARAM wParam, LPARAM lParam)
                                 BARRIER_MSG_SCREEN_SAVER, TRUE, 0);
             }
         }
-        if (g_mode == kHOOK_RELAY_EVENTS) {
-            MSG* msg = reinterpret_cast<MSG*>(lParam);
-            if (g_wheelSupport == kWheelOld && msg->message == g_wmMouseWheel) {
-                // post message to our window
-                PostThreadMessage(g_threadID,
-                                BARRIER_MSG_MOUSE_WHEEL,
-                                static_cast<SInt16>(msg->wParam & 0xffffu), 0);
-
-                // zero out the delta in the message so it's (hopefully)
-                // ignored
-                msg->wParam = 0;
-            }
-        }
     }
 
     return CallNextHookEx(g_getMessage, code, wParam, lParam);
@@ -661,52 +644,6 @@ mouseLLHook(int code, WPARAM wParam, LPARAM lParam)
     return CallNextHookEx(g_mouseLL, code, wParam, lParam);
 }
 
-static
-EWheelSupport
-getWheelSupport()
-{
-    // see if modern wheel is present
-    if (GetSystemMetrics(SM_MOUSEWHEELPRESENT)) {
-        OSVERSIONINFOEX osvi;
-        osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
-        osvi.dwPlatformId = VER_PLATFORM_WIN32_NT;
-        osvi.dwMajorVersion = 5;
-        osvi.dwMinorVersion = 0;
-        ULONGLONG condMask = 0;
-        VER_SET_CONDITION (condMask, VER_MAJORVERSION, VER_EQUAL);
-        VER_SET_CONDITION (condMask, VER_MINORVERSION, VER_EQUAL);
-        VER_SET_CONDITION (condMask, VER_PLATFORMID, VER_EQUAL);
-        if (VerifyVersionInfo(&osvi, VER_MAJORVERSION | VER_MINORVERSION |
-                              VER_PLATFORMID, condMask)) {
-            return kWheelWin2000;
-        }
-        return kWheelModern;
-    }
-
-    // not modern.  see if we've got old-style support.
-#if defined(MSH_WHEELSUPPORT)
-    UINT wheelSupportMsg    = RegisterWindowMessage(MSH_WHEELSUPPORT);
-    HWND wheelSupportWindow = FindWindow(MSH_WHEELMODULE_CLASS,
-                                        MSH_WHEELMODULE_TITLE);
-    if (wheelSupportWindow != NULL && wheelSupportMsg != 0) {
-        if (SendMessage(wheelSupportWindow, wheelSupportMsg, 0, 0) != 0) {
-            g_wmMouseWheel = RegisterWindowMessage(MSH_MOUSEWHEEL);
-            if (g_wmMouseWheel != 0) {
-                return kWheelOld;
-            }
-        }
-    }
-#endif
-
-    // assume modern.  we don't do anything special in this case
-    // except respond to WM_MOUSEWHEEL messages.  GetSystemMetrics()
-    // can apparently return FALSE even if a mouse wheel is present
-    // though i'm not sure exactly when it does that (WinME returns
-    // FALSE for my logitech USB trackball).
-    return kWheelModern;
-}
-
-
 //
 // external functions
 //
@@ -831,7 +768,6 @@ init(DWORD threadID)
         // removed the hooks so we just need to reset our state.
         g_hinstance       = GetModuleHandle(_T("synwinhk"));
         g_processID       = GetCurrentProcessId();
-        g_wheelSupport    = kWheelNone;
         g_threadID        = 0;
         g_getMessage      = NULL;
         g_keyboardLL      = NULL;
@@ -885,17 +821,6 @@ install()
     // reset fake input flag
     g_fakeInput = false;
 
-    // check for mouse wheel support
-    g_wheelSupport = getWheelSupport();
-
-    // install GetMessage hook (unless already installed)
-    if (g_wheelSupport == kWheelOld && g_getMessage == NULL) {
-        g_getMessage = SetWindowsHookEx(WH_GETMESSAGE,
-                                &getMessageHook,
-                                g_hinstance,
-                                0);
-    }
-
     // install low-level hooks.  we require that they both get installed.
     g_mouseLL = SetWindowsHookEx(WH_MOUSE_LL,
                                 &mouseLLHook,
@@ -919,11 +844,11 @@ install()
 #endif
 
     // check that we got all the hooks we wanted
-    if ((g_getMessage == NULL && g_wheelSupport == kWheelOld) ||
+    if ((g_mouseLL == NULL) ||
 #if !NO_GRAB_KEYBOARD
-        (g_keyboardLL == NULL) ||
+        (g_keyboardLL == NULL)
 #endif
-        (g_mouseLL    == NULL)) {
+        ) {
         uninstall();
         return kHOOK_FAILED;
     }
@@ -958,7 +883,6 @@ uninstall(void)
         UnhookWindowsHookEx(g_getMessage);
         g_getMessage = NULL;
     }
-    g_wheelSupport = kWheelNone;
 
     return 1;
 }
@@ -993,7 +917,7 @@ uninstallScreenSaver(void)
     assert(g_hinstance != NULL);
 
     // uninstall hook unless the mouse wheel hook is installed
-    if (g_getMessage != NULL && g_wheelSupport != kWheelOld) {
+    if (g_getMessage != NULL) {
         UnhookWindowsHookEx(g_getMessage);
         g_getMessage = NULL;
     }