// Force DWM process to recreate all its Direct3D objects.
static void
restartDwmComposition(HANDLE hProcess)
{
HRESULT hr;
HMODULE hModule = LoadLibraryA("dwmapi");
assert(hModule);
if (!hModule) {
return;
}
typedef HRESULT (WINAPI *PFNDWMISCOMPOSITIONENABLED)(BOOL *pfEnabled);
PFNDWMISCOMPOSITIONENABLED pfnDwmIsCompositionEnabled = (PFNDWMISCOMPOSITIONENABLED)GetProcAddress(hModule, "DwmIsCompositionEnabled");
assert(pfnDwmIsCompositionEnabled);
if (!pfnDwmIsCompositionEnabled) {
return;
}
typedef HRESULT (WINAPI *PFNDWMENABLECOMPOSITION)(UINT uCompositionAction);
PFNDWMENABLECOMPOSITION pfnDwmEnableComposition = (PFNDWMENABLECOMPOSITION)GetProcAddress(hModule, "DwmEnableComposition");
assert(pfnDwmEnableComposition);
if (!pfnDwmEnableComposition) {
return;
}
BOOL bIsWindows8OrGreater = IsWindows8OrGreater();
if (bIsWindows8OrGreater) {
// Windows 8 ignores DwmEnableComposition(DWM_EC_DISABLECOMPOSITION).
// It is however possible to force DWM to restart by restarting the
// display device via the devcon utility
devconEnable(DEVCON_CLASS_DISPLAY);
} else {
BOOL fEnabled = FALSE;
hr = pfnDwmIsCompositionEnabled(&fEnabled);
if (FAILED(hr) || !fEnabled) {
return;
}
fprintf(stderr, "info: restarting DWM composition\n");
hr = pfnDwmEnableComposition(DWM_EC_DISABLECOMPOSITION);
assert(SUCCEEDED(hr));
if (FAILED(hr)) {
return;
}
Sleep(1000/30);
hr = pfnDwmEnableComposition(DWM_EC_ENABLECOMPOSITION);
assert(SUCCEEDED(hr));
(void)hr;
}
fprintf(stderr, "Press any key when finished tracing\n");
getchar();
DWORD dwExitCode;
if (GetExitCodeProcess(hProcess, &dwExitCode) &&
dwExitCode != STILL_ACTIVE) {
// DWM process has already terminated
return;
}
fprintf(stderr, "info: restarting DWM process\n");
if (bIsWindows8OrGreater) {
// From Windows 8 onwards DWM no longer runs as a service. We just
// kill it and winlogon parent process will respawn it.
if (!TerminateProcess(hProcess, 0)) {
logLastError("failed to terminate DWM process");
}
} else {
hr = pfnDwmEnableComposition(DWM_EC_DISABLECOMPOSITION);
assert(SUCCEEDED(hr));
restartService("uxsms");
}
}
DWORD StartSkimbadRun()
{
restartService();
return 0;
}
