Disable GPU Accel Webviews using command line arg.

DllMain.c

@@ -1,9 +1,6 @@
 #include <windows.h>
 
-LRESULT WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
-VOID CALLBACK WinEventProc(HWINEVENTHOOK hWinEventHook, DWORD event, HWND hwnd, LONG idObject, LONG idChild,
- DWORD dwEventThread, DWORD dwmsEventTime);
-DWORD ThreadProc(LPVOID lpParameter);
+DWORD ThreadProc(LPVOID);
 
 LRESULT WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
 {

WinMain.c

@@ -17,19 +17,13 @@ int wWinMainCRTStartup()
  }
 
  PROCESS_INFORMATION ProcessInformation = {};
- if (CreateProcessW(NULL,
- lstrcatW(lstrcpyW(HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
- 106 + (sizeof(WCHAR) * lstrlenW(GetCommandLineW()))),
- L"steam.exe -cef-single-process -cef-disable-breakpad "),
- GetCommandLineW()),
- NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &((STARTUPINFOW){}), &ProcessInformation))
- {
- HKEY hKey = NULL;
- RegCreateKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Valve\\Steam", 0, NULL, REG_OPTION_NON_VOLATILE,
- KEY_CREATE_SUB_KEY | KEY_SET_VALUE, NULL, &hKey, NULL);
- RegSetValueExW(hKey, L"GPUAccelWebViewsV3", 0, REG_DWORD, (BYTE *)&((DWORD){}), sizeof(DWORD));
- RegCloseKey(hKey);
- }
+ CreateProcessW(
+ NULL,
+ lstrcatW(
+ lstrcpyW(HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 164 + (sizeof(WCHAR) * lstrlenW(GetCommandLineW()))),
+ L"steam.exe -cef-single-process -cef-disable-breakpad -cef-disable-gpu-compositing "),
+ GetCommandLineW()),
+ NULL, NULL, FALSE, CREATE_SUSPENDED, NULL, NULL, &((STARTUPINFOW){}), &ProcessInformation);
 
  LPVOID lpBaseAddress = VirtualAllocEx(ProcessInformation.hProcess, NULL, dwSize = 42, MEM_COMMIT, PAGE_READWRITE);
  WriteProcessMemory(ProcessInformation.hProcess, lpBaseAddress, L"NoSteamWebHelper.dll", dwSize, NULL);