Ignore synthetic mouse events generated for touchscreens

Windows generates fake raw mouse events for touchscreens for compatibility with legacy apps that predate touch support in Windows. We already handle touch events explicitly, so drop the synthetic events to avoid duplicates.
libsdl-org · Jul 7, 2019 · 7e09718 · 7e09718
1 parent e841b06
commit 7e09718
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/video/windows/SDL_windowsevents.c b/src/video/windows/SDL_windowsevents.c
@@ -552,8 +552,8 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 
             GetRawInputData(hRawInput, RID_INPUT, &inp, &size, sizeof(RAWINPUTHEADER));
 
-            /* Mouse data */
-            if (inp.header.dwType == RIM_TYPEMOUSE) {
+            /* Mouse data (ignoring synthetic mouse events generated for touchscreens) */
+            if (inp.header.dwType == RIM_TYPEMOUSE && (GetMessageExtraInfo() & 0x80) == 0) {
                 if (isRelative) {
                     RAWMOUSE* rawmouse = &inp.data.mouse;