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Avoid display switching unexpectedly when the UAC secure desktop appears

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This commit is contained in:
Cameron Gutman 2024-02-27 00:27:09 -06:00
parent 1020d0c133
commit a0d5973799
1 changed files with 32 additions and 6 deletions
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38
src/platform/windows/display_base.cpp
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@ -358,8 +358,15 @@ namespace platf::dxgi {
return false;
}
/**
* @brief Tests to determine if the Desktop Duplication API can capture the given output.
* @details When testing for enumeration only, we avoid resyncing the thread desktop.
* @param adapter The DXGI adapter to use for capture.
* @param output The DXGI output to capture.
* @param enumeration_only Specifies whether this test is occurring for display enumeration.
*/
bool
test_dxgi_duplication(adapter_t &adapter, output_t &output) {
test_dxgi_duplication(adapter_t &adapter, output_t &output, bool enumeration_only) {
D3D_FEATURE_LEVEL featureLevels[] {
D3D_FEATURE_LEVEL_11_1,
D3D_FEATURE_LEVEL_11_0,
@ -397,14 +404,26 @@ namespace platf::dxgi {
for (int x = 0; x < 2; ++x) {
dup_t dup;
// Ensure we can duplicate the current display
syncThreadDesktop();
// Only resynchronize the thread desktop when not enumerating displays.
// During enumeration, the caller will do this only once to ensure
// a consistent view of available outputs.
if (!enumeration_only) {
syncThreadDesktop();
}
status = output1->DuplicateOutput((IUnknown *) device.get(), &dup);
if (SUCCEEDED(status)) {
return true;
}
std::this_thread::sleep_for(200ms);
// If we're not resyncing the thread desktop and we don't have permission to
// capture the current desktop, just bail immediately. Retrying won't help.
if (enumeration_only && status == E_ACCESSDENIED) {
break;
}
else {
std::this_thread::sleep_for(200ms);
}
}
BOOST_LOG(error) << "DuplicateOutput() test failed [0x"sv << util::hex(status).to_string_view() << ']';
@ -472,7 +491,7 @@ namespace platf::dxgi {
continue;
}
if (desc.AttachedToDesktop && test_dxgi_duplication(adapter_tmp, output_tmp)) {
if (desc.AttachedToDesktop && test_dxgi_duplication(adapter_tmp, output_tmp, false)) {
output = std::move(output_tmp);
offset_x = desc.DesktopCoordinates.left;
@ -1068,6 +1087,13 @@ namespace platf {
BOOST_LOG(warning) << "Failed to set GPU preference. Capture may not work!"sv;
}
// We sync the thread desktop once before we start the enumeration process
// to ensure test_dxgi_duplication() returns consistent results for all GPUs
// even if the current desktop changes during our enumeration process.
// It is critical that we either fully succeed in enumeration or fully fail,
// otherwise it can lead to the capture code switching monitors unexpectedly.
syncThreadDesktop();
dxgi::factory1_t factory;
status = CreateDXGIFactory1(IID_IDXGIFactory1, (void **) &factory);
if (FAILED(status)) {
@ -1111,7 +1137,7 @@ namespace platf {
<< std::endl;
// Don't include the display in the list if we can't actually capture it
if (desc.AttachedToDesktop && dxgi::test_dxgi_duplication(adapter, output)) {
if (desc.AttachedToDesktop && dxgi::test_dxgi_duplication(adapter, output, true)) {
display_names.emplace_back(std::move(device_name));
}
}