windows: Try to unify all the GUID comparison code into a core helper function.

There are likely several more I missed.

src/core/windows/SDL_windows.c

@@ -158,7 +158,7 @@ WIN_LookupAudioDeviceName(const WCHAR *name, const GUID *guid)
     DWORD len = 0;
     char *retval = NULL;
 
-    if (SDL_memcmp(guid, &nullguid, sizeof (*guid)) == 0) {
+    if (WIN_IsEqualGUID(guid, &nullguid)) {
         return WIN_StringToUTF8(name);  /* No GUID, go with what we've got. */
     }
 
@@ -202,6 +202,18 @@ WIN_LookupAudioDeviceName(const WCHAR *name, const GUID *guid)
 #endif /* if __WINRT__ / else */
 }
 
+BOOL
+WIN_IsEqualGUID(const GUID * a, const GUID * b)
+{
+    return (SDL_memcmp(a, b, sizeof (*a)) == 0);
+}
+
+BOOL
+WIN_IsEqualIID(REFIID a, REFIID b)
+{
+    return (SDL_memcmp(a, b, sizeof (*a)) == 0);
+}
+
 #endif /* __WIN32__ || __WINRT__ */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/core/windows/SDL_windows.h

@@ -62,6 +62,10 @@ extern BOOL WIN_IsWindowsVistaOrGreater(void);
 /* You need to SDL_free() the result of this call. */
 extern char *WIN_LookupAudioDeviceName(const WCHAR *name, const GUID *guid);
 
+/* Checks to see if two GUID are the same. */
+extern BOOL WIN_IsEqualGUID(const GUID * a, const GUID * b);
+extern BOOL WIN_IsEqualIID(REFIID a, REFIID b);
+
 #endif /* _INCLUDED_WINDOWS_H */
 
 /* vi: set ts=4 sw=4 expandtab: */

src/haptic/windows/SDL_dinputhaptic.c

@@ -58,15 +58,6 @@ DI_SetError(const char *str, HRESULT err)
     return SDL_SetError("Haptic error %s", str);
 }
 
-/*
- * Checks to see if two GUID are the same.
- */
-static int
-DI_GUIDIsSame(const GUID * a, const GUID * b)
-{
-    return (SDL_memcmp(a, b, sizeof (GUID)) == 0);
-}
-
 /*
  * Callback to find the haptic devices.
  */
@@ -219,17 +210,17 @@ DI_DeviceObjectCallback(LPCDIDEVICEOBJECTINSTANCE dev, LPVOID pvRef)
     if ((dev->dwType & DIDFT_AXIS) && (dev->dwFlags & DIDOI_FFACTUATOR)) {
         const GUID *guid = &dev->guidType;
         DWORD offset = 0;
-        if (DI_GUIDIsSame(guid, &GUID_XAxis)) {
+        if (WIN_IsEqualGUID(guid, &GUID_XAxis)) {
             offset = DIJOFS_X;
-        } else if (DI_GUIDIsSame(guid, &GUID_YAxis)) {
+        } else if (WIN_IsEqualGUID(guid, &GUID_YAxis)) {
             offset = DIJOFS_Y;
-        } else if (DI_GUIDIsSame(guid, &GUID_ZAxis)) {
+        } else if (WIN_IsEqualGUID(guid, &GUID_ZAxis)) {
             offset = DIJOFS_Z;
-        } else if (DI_GUIDIsSame(guid, &GUID_RxAxis)) {
+        } else if (WIN_IsEqualGUID(guid, &GUID_RxAxis)) {
             offset = DIJOFS_RX;
-        } else if (DI_GUIDIsSame(guid, &GUID_RyAxis)) {
+        } else if (WIN_IsEqualGUID(guid, &GUID_RyAxis)) {
             offset = DIJOFS_RY;
-        } else if (DI_GUIDIsSame(guid, &GUID_RzAxis)) {
+        } else if (WIN_IsEqualGUID(guid, &GUID_RzAxis)) {
             offset = DIJOFS_RZ;
         } else {
             return DIENUM_CONTINUE;   /* can't use this, go on. */
@@ -251,7 +242,7 @@ DI_DeviceObjectCallback(LPCDIDEVICEOBJECTINSTANCE dev, LPVOID pvRef)
  * Callback to get all supported effects.
  */
 #define EFFECT_TEST(e,s)               \
-if (DI_GUIDIsSame(&pei->guid, &(e)))   \
+if (WIN_IsEqualGUID(&pei->guid, &(e)))   \
    haptic->supported |= (s)
 static BOOL CALLBACK
 DI_EffectCallback(LPCDIEFFECTINFO pei, LPVOID pv)
@@ -481,7 +472,7 @@ SDL_DINPUT_JoystickSameHaptic(SDL_Haptic * haptic, SDL_Joystick * joystick)
         return 0;
     }
 
-    return DI_GUIDIsSame(&hap_instance.guidInstance, &joy_instance.guidInstance);
+    return WIN_IsEqualGUID(&hap_instance.guidInstance, &joy_instance.guidInstance);
 }
 
 int
@@ -500,7 +491,7 @@ SDL_DINPUT_HapticOpenFromJoystick(SDL_Haptic * haptic, SDL_Joystick * joystick)
 
     /* Since it comes from a joystick we have to try to match it with a haptic device on our haptic list. */
     for (item = SDL_hapticlist; item != NULL; item = item->next) {
-        if (!item->bXInputHaptic && DI_GUIDIsSame(&item->instance.guidInstance, &joy_instance.guidInstance)) {
+        if (!item->bXInputHaptic && WIN_IsEqualGUID(&item->instance.guidInstance, &joy_instance.guidInstance)) {
             haptic->index = index;
             return SDL_DINPUT_HapticOpenFromDevice(haptic, joystick->hwdata->InputDevice, SDL_TRUE);
         }

src/video/windows/SDL_windowskeyboard.c

@@ -331,9 +331,6 @@ static DWORD IME_GetId(SDL_VideoData *videodata, UINT uIndex);
 static void IME_SendEditingEvent(SDL_VideoData *videodata);
 static void IME_DestroyTextures(SDL_VideoData *videodata);
 
-#define SDL_IsEqualIID(riid1, riid2) SDL_IsEqualGUID(riid1, riid2)
-#define SDL_IsEqualGUID(rguid1, rguid2) (!SDL_memcmp(rguid1, rguid2, sizeof(GUID)))
-
 static SDL_bool UILess_SetupSinks(SDL_VideoData *videodata);
 static void UILess_ReleaseSinks(SDL_VideoData *videodata);
 static void UILess_EnableUIUpdates(SDL_VideoData *videodata);
@@ -1052,9 +1049,9 @@ STDMETHODIMP UIElementSink_QueryInterface(TSFSink *sink, REFIID riid, PVOID *ppv
         return E_INVALIDARG;
 
     *ppv = 0;
-    if (SDL_IsEqualIID(riid, &IID_IUnknown))
+    if (WIN_IsEqualIID(riid, &IID_IUnknown))
         *ppv = (IUnknown *)sink;
-    else if (SDL_IsEqualIID(riid, &IID_ITfUIElementSink))
+    else if (WIN_IsEqualIID(riid, &IID_ITfUIElementSink))
         *ppv = (ITfUIElementSink *)sink;
 
     if (*ppv) {
@@ -1158,9 +1155,9 @@ STDMETHODIMP IPPASink_QueryInterface(TSFSink *sink, REFIID riid, PVOID *ppv)
         return E_INVALIDARG;
 
     *ppv = 0;
-    if (SDL_IsEqualIID(riid, &IID_IUnknown))
+    if (WIN_IsEqualIID(riid, &IID_IUnknown))
         *ppv = (IUnknown *)sink;
-    else if (SDL_IsEqualIID(riid, &IID_ITfInputProcessorProfileActivationSink))
+    else if (WIN_IsEqualIID(riid, &IID_ITfInputProcessorProfileActivationSink))
         *ppv = (ITfInputProcessorProfileActivationSink *)sink;
 
     if (*ppv) {
@@ -1174,8 +1171,8 @@ STDMETHODIMP IPPASink_OnActivated(TSFSink *sink, DWORD dwProfileType, LANGID lan
 {
     static const GUID TF_PROFILE_DAYI = { 0x037B2C25, 0x480C, 0x4D7F, { 0xB0, 0x27, 0xD6, 0xCA, 0x6B, 0x69, 0x78, 0x8A } };
     SDL_VideoData *videodata = (SDL_VideoData *)sink->data;
-    videodata->ime_candlistindexbase = SDL_IsEqualGUID(&TF_PROFILE_DAYI, guidProfile) ? 0 : 1;
-    if (SDL_IsEqualIID(catid, &GUID_TFCAT_TIP_KEYBOARD) && (dwFlags & TF_IPSINK_FLAG_ACTIVE))
+    videodata->ime_candlistindexbase = WIN_IsEqualGUID(&TF_PROFILE_DAYI, guidProfile) ? 0 : 1;
+    if (WIN_IsEqualIID(catid, &GUID_TFCAT_TIP_KEYBOARD) && (dwFlags & TF_IPSINK_FLAG_ACTIVE))
         IME_InputLangChanged((SDL_VideoData *)sink->data);
 
     IME_HideCandidateList(videodata);