[Screen Ruler] optimize d3d device & continuous capture mode (#20198)

* [Screen Ruler] Exclude overlay window from capture

* [Screen ruler] Sync OverlayUI threads creation and don't recreate d3d device

.github/actions/spell-check/expect.txt

@@ -346,6 +346,7 @@ CSIDL
 csignal
 cso
 CSRW
+cstddef
 cstdint
 cstdlib
 cstring
@@ -489,6 +490,7 @@ dreamsofameaningfullife
 drivedetectionwarning
 dshow
 dst
+DState
 DTo
 dutil
 DVASPECT
@@ -579,6 +581,7 @@ EWXREBOOT
 EWXSHUTDOWN
 examplehandler
 examplepowertoy
+EXCLUDEFROMCAPTURE
 exdisp
 Executables
 executionpolicy
@@ -1628,6 +1631,7 @@ ptd
 PTOKEN
 PToy
 ptr
+ptrdiff
 ptstr
 PVOID
 pwa
@@ -2273,6 +2277,7 @@ wcscpy
 wcslen
 wcsncmp
 wcsnicmp
+WDA
 wdp
 wdupenv
 weakme

src/modules/MeasureTool/MeasureToolCore/D2DState.cpp

@@ -28,8 +28,6 @@ D2DState::D2DState(const HWND overlayWindow, std::vector<D2D1::ColorF> solidBrus
     winrt::check_bool(GetClientRect(overlayWindow, &clientRect));
     winrt::check_hresult(D2D1CreateFactory(D2D1_FACTORY_TYPE_MULTI_THREADED, &d2dFactory));
 
-    winrt::check_hresult(DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory), writeFactory.put_unknown()));
-
     // We should always use DPIAware::DEFAULT_DPI, since it's the correct thing to do in DPI-Aware mode
     auto renderTargetProperties = D2D1::RenderTargetProperties(
         D2D1_RENDER_TARGET_TYPE_DEFAULT,
@@ -49,6 +47,7 @@ D2DState::D2DState(const HWND overlayWindow, std::vector<D2D1::ColorF> solidBrus
     DPIAware::GetScreenDPIForWindow(overlayWindow, dpi);
     dpiScale = dpi / static_cast<float>(DPIAware::DEFAULT_DPI);
 
+    winrt::check_hresult(DWriteCreateFactory(DWRITE_FACTORY_TYPE_SHARED, __uuidof(IDWriteFactory), writeFactory.put_unknown()));
     winrt::check_hresult(writeFactory->CreateTextFormat(L"Segoe UI Variable Text",
                                                         nullptr,
                                                         DWRITE_FONT_WEIGHT_NORMAL,

src/modules/MeasureTool/MeasureToolCore/EdgeDetection.cpp

@@ -10,28 +10,10 @@ inline long FindEdge(const BGRATextureView& texture, const POINT centerPoint, co
 {
     using namespace consts;
 
-    long xOffset = 0;
-    long yOffset = 0;
-
-    // For continuous capture, we'll be a bit off center from the cursor so the cross we draw won't interfere with the measurement.
-    if constexpr (ContinuousCapture)
-    {
-        if constexpr (IsX)
-        {
-            xOffset = Increment ? CURSOR_OFFSET_AMOUNT_X : -CURSOR_OFFSET_AMOUNT_X;
-            yOffset = 1;
-        }
-        else
-        {
-            xOffset = 1;
-            yOffset = Increment ? CURSOR_OFFSET_AMOUNT_Y : -CURSOR_OFFSET_AMOUNT_Y;
-        }
-    }
-
     const size_t maxDim = IsX ? texture.width : texture.height;
 
-    long x = std::clamp<long>(centerPoint.x + xOffset, 1, static_cast<long>(texture.width - 2));
+    long x = std::clamp<long>(centerPoint.x, 1, static_cast<long>(texture.width - 2));
-    long y = std::clamp<long>(centerPoint.y + yOffset, 1, static_cast<long>(texture.height - 2));
+    long y = std::clamp<long>(centerPoint.y, 1, static_cast<long>(texture.height - 2));
 
     const uint32_t startPixel = texture.GetPixel(x, y);
     while (true)

src/modules/MeasureTool/MeasureToolCore/MeasureToolOverlayUI.cpp

@@ -217,7 +217,7 @@ void DrawMeasureToolTick(const CommonState& commonState,
         D2D_POINT_2F hLineEnd{ .x = hLineStart.x + hMeasure, .y = hLineStart.y };
         d2dState.rt->DrawLine(hLineStart, hLineEnd, d2dState.solidBrushes[Brush::line].get());
 
-        if (drawFeetOnCross && !continuousCapture)
+        if (drawFeetOnCross)
         {
             // To fill all pixels which are close, we call DrawLine with end point one pixel too far, since
             // it doesn't get filled, i.e. end point of the range is excluded. However, we want to draw cross
@@ -236,7 +236,7 @@ void DrawMeasureToolTick(const CommonState& commonState,
         D2D_POINT_2F vLineEnd{ .x = vLineStart.x, .y = vLineStart.y + vMeasure };
         d2dState.rt->DrawLine(vLineStart, vLineEnd, d2dState.solidBrushes[Brush::line].get());
 
-        if (drawFeetOnCross && !continuousCapture)
+        if (drawFeetOnCross)
         {
             vLineEnd.y -= 1.f;
             auto [top_start, top_end] = ComputeCrossFeetLine(vLineStart, true);

src/modules/MeasureTool/MeasureToolCore/OverlayUI.cpp

@@ -59,6 +59,7 @@ HWND CreateOverlayUIWindow(const CommonState& commonState,
     };
     winrt::check_bool(window);
     ShowWindow(window, SW_SHOWNORMAL);
+    SetWindowDisplayAffinity(window, WDA_EXCLUDEFROMCAPTURE);
 #if !defined(DEBUG_OVERLAY)
     SetWindowPos(window, HWND_TOPMOST, {}, {}, {}, {}, SWP_NOMOVE | SWP_NOSIZE);
 #else
@@ -136,12 +137,7 @@ void OverlayUIState::RunUILoop()
             else
                 _d2dState.rt->Clear();
 
-            {
+            _d2dState.rt->EndDraw();
-                // TODO: use latch to wait until all threads are created their corresponding d2d textures
-                // in the non-continuous mode
-                // std::lock_guard guard{ gpuAccessLock };
-                _d2dState.rt->EndDraw();
-            }
         }
 
         run_message_loop(true, 1);
@@ -182,6 +178,7 @@ template<typename ToolT, typename TickFuncT>
 inline std::unique_ptr<OverlayUIState> OverlayUIState::CreateInternal(ToolT& toolState,
                                                                       TickFuncT tickFunc,
                                                                       CommonState& commonState,
+                                                                      Latch& creationLatch,
                                                                       const wchar_t* toolWindowClassName,
                                                                       void* windowParam,
                                                                       const MonitorInfo& monitor,
@@ -199,6 +196,9 @@ inline std::unique_ptr<OverlayUIState> OverlayUIState::CreateInternal(ToolT& too
         auto* state = uiState.get();
         uiCreatedEvent.SetEvent();
 
+        // Wait until all OverlayUI threads created their corresponding d2d devices
+        creationLatch.arrive_and_wait();
+
         state->RunUILoop();
 
         commonState.closeOnOtherMonitors = true;
@@ -211,12 +211,14 @@ inline std::unique_ptr<OverlayUIState> OverlayUIState::CreateInternal(ToolT& too
 }
 
 std::unique_ptr<OverlayUIState> OverlayUIState::Create(Serialized<MeasureToolState>& toolState,
+                                                       Latch& creationLatch,
                                                        CommonState& commonState,
                                                        const MonitorInfo& monitor)
 {
     return OverlayUIState::CreateInternal(toolState,
                                           DrawMeasureToolTick,
                                           commonState,
+                                          creationLatch,
                                           NonLocalizable::MeasureToolOverlayWindowName,
                                           &toolState,
                                           monitor,
@@ -224,12 +226,14 @@ std::unique_ptr<OverlayUIState> OverlayUIState::Create(Serialized<MeasureToolSta
 }
 
 std::unique_ptr<OverlayUIState> OverlayUIState::Create(BoundsToolState& toolState,
+                                                       Latch& creationLatch,
                                                        CommonState& commonState,
                                                        const MonitorInfo& monitor)
 {
     return OverlayUIState::CreateInternal(toolState,
                                           DrawBoundsToolTick,
                                           commonState,
+                                          creationLatch,
                                           NonLocalizable::BoundsToolOverlayWindowName,
                                           &toolState,
                                           monitor,

src/modules/MeasureTool/MeasureToolCore/OverlayUI.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "D2DState.h"
+#include "latch.h"
 #include "ToolState.h"
 
 #include <common/display/monitors.h>
@@ -27,6 +28,7 @@ class OverlayUIState final
     static std::unique_ptr<OverlayUIState> CreateInternal(ToolT& toolState,
                                                           TickFuncT tickFunc,
                                                           CommonState& commonState,
+                                                          Latch& creationLatch,
                                                           const wchar_t* toolWindowClassName,
                                                           void* windowParam,
                                                           const MonitorInfo& monitor,
@@ -37,9 +39,11 @@ public:
     ~OverlayUIState();
 
     static std::unique_ptr<OverlayUIState> Create(BoundsToolState& toolState,
+                                                  Latch& creationLatch,
                                                   CommonState& commonState,
                                                   const MonitorInfo& monitor);
     static std::unique_ptr<OverlayUIState> Create(Serialized<MeasureToolState>& toolState,
+                                                  Latch& creationLatch,
                                                   CommonState& commonState,
                                                   const MonitorInfo& monitor);
     inline HWND overlayWindowHandle() const

src/modules/MeasureTool/MeasureToolCore/PowerToys.MeasureToolCore.cpp

@@ -79,11 +79,17 @@ namespace winrt::PowerToys::MeasureToolCore::implementation
 
 #if defined(DEBUG_PRIMARY_MONITOR_ONLY)
         const auto& monitorInfo = MonitorInfo::GetPrimaryMonitor();
+        Latch createOverlayUILatch{ 1 };
 #else
-        for (const auto& monitorInfo : MonitorInfo::GetMonitors(true))
+        const auto monitors = MonitorInfo::GetMonitors(true);
+        Latch createOverlayUILatch{ static_cast<ptrdiff_t>(monitors.size()) };
+        for (const auto& monitorInfo : monitors)
 #endif
         {
-            auto overlayUI = OverlayUIState::Create(_boundsToolState, _commonState, monitorInfo);
+            auto overlayUI = OverlayUIState::Create(_boundsToolState,
+                                                    createOverlayUILatch,
+                                                    _commonState,
+                                                    monitorInfo);
 #if !defined(DEBUG_PRIMARY_MONITOR_ONLY)
             if (!overlayUI)
                 continue;
@@ -110,22 +116,37 @@ namespace winrt::PowerToys::MeasureToolCore::implementation
         });
 
 #if defined(DEBUG_PRIMARY_MONITOR_ONLY)
-        const auto& monitorInfo = MonitorInfo::GetPrimaryMonitor();
+        std::vector<MonitorInfo> monitors = { MonitorInfo::GetPrimaryMonitor() };
+        const auto& monitorInfo = monitors[0];
+        Latch createOverlayUILatch{ 1 };
 #else
-        for (const auto& monitorInfo : MonitorInfo::GetMonitors(true))
+        const auto monitors = MonitorInfo::GetMonitors(true);
+        Latch createOverlayUILatch{ static_cast<ptrdiff_t>(monitors.size()) };
+        for (const auto& monitorInfo : monitors)
 #endif
         {
-            auto overlayUI = OverlayUIState::Create(_measureToolState, _commonState, monitorInfo);
+            auto overlayUI = OverlayUIState::Create(_measureToolState,
+                                                    createOverlayUILatch,
+                                                    _commonState,
+                                                    monitorInfo);
 #if !defined(DEBUG_PRIMARY_MONITOR_ONLY)
             if (!overlayUI)
-                continue;
+                return;
 #endif
-            _screenCaptureThreads.emplace_back(StartCapturingThread(_commonState,
-                                                                    _measureToolState,
-                                                                    overlayUI->overlayWindowHandle(),
-                                                                    monitorInfo));
             _overlayUIStates.push_back(std::move(overlayUI));
         }
+
+        for (size_t i = 0; i < monitors.size(); ++i)
+        {
+            auto thread = StartCapturingThread(
+                &_d3dState,
+                _commonState,
+                _measureToolState,
+                _overlayUIStates[i]->overlayWindowHandle(),
+                monitors[i]);
+            _screenCaptureThreads.emplace_back(std::move(thread));
+        }
+
         Trace::MeasureToolActivated();
     }
 

src/modules/MeasureTool/MeasureToolCore/PowerToys.MeasureToolCore.h

@@ -6,6 +6,7 @@
 #include "Settings.h"
 
 #include <common/utils/serialized.h>
+#include "ScreenCapturing.h"
 
 namespace winrt::PowerToys::MeasureToolCore::implementation
 {
@@ -21,6 +22,8 @@ namespace winrt::PowerToys::MeasureToolCore::implementation
         float GetDPIScaleForWindow(uint64_t windowHandle);
         void MouseCaptureThread();
 
+        D3DState _d3dState;
+
         wil::shared_event _stopMouseCaptureThreadSignal;
         std::thread _mouseCaptureThread;
         std::vector<std::thread> _screenCaptureThreads;

src/modules/MeasureTool/MeasureToolCore/PowerToys.MeasureToolCore.vcxproj

@@ -86,6 +86,7 @@
     <ClInclude Include="BGRATextureView.h" />
     <ClInclude Include="EdgeDetection.h" />
     <ClInclude Include="ToolState.h" />
+    <ClInclude Include="latch.h" />
     <ClInclude Include="OverlayUI.h" />
     <ClInclude Include="pch.h" />
     <ClInclude Include="ScreenCapturing.h" />

src/modules/MeasureTool/MeasureToolCore/ScreenCapturing.cpp

@@ -10,9 +10,45 @@
 
 //#define DEBUG_EDGES
 
+D3DState::D3DState()
+{
+    UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
+#ifndef NDEBUG
+    flags |= D3D11_CREATE_DEVICE_DEBUG;
+#endif
+    HRESULT hr =
+        D3D11CreateDevice(nullptr,
+                          D3D_DRIVER_TYPE_HARDWARE,
+                          nullptr,
+                          flags,
+                          nullptr,
+                          0,
+                          D3D11_SDK_VERSION,
+                          d3dDevice.put(),
+                          nullptr,
+                          nullptr);
+    if (hr == DXGI_ERROR_UNSUPPORTED)
+    {
+        hr = D3D11CreateDevice(nullptr,
+                               D3D_DRIVER_TYPE_WARP,
+                               nullptr,
+                               flags,
+                               nullptr,
+                               0,
+                               D3D11_SDK_VERSION,
+                               d3dDevice.put(),
+                               nullptr,
+                               nullptr);
+    }
+    winrt::check_hresult(hr);
+
+    dxgiDevice = d3dDevice.as<IDXGIDevice>();
+    winrt::check_hresult(CreateDirect3D11DeviceFromDXGIDevice(dxgiDevice.get(), d3dDeviceInspectable.put()));
+}
+
 class D3DCaptureState final
 {
-    winrt::com_ptr<ID3D11Device> d3dDevice;
+    D3DState* d3dState = nullptr;
     winrt::IDirect3DDevice device;
     winrt::com_ptr<IDXGISwapChain1> swapChain;
     winrt::com_ptr<ID3D11DeviceContext> context;
@@ -26,8 +62,7 @@ class D3DCaptureState final
     Box monitorArea;
     bool captureOutsideOfMonitor = false;
 
-    D3DCaptureState(winrt::com_ptr<ID3D11Device> d3dDevice,
+    D3DCaptureState(D3DState* d3dState,
-                    winrt::IDirect3DDevice _device,
                     winrt::com_ptr<IDXGISwapChain1> _swapChain,
                     winrt::com_ptr<ID3D11DeviceContext> _context,
                     const winrt::GraphicsCaptureItem& item,
@@ -44,7 +79,8 @@ class D3DCaptureState final
     std::mutex destructorMutex;
 
 public:
-    static std::unique_ptr<D3DCaptureState> Create(winrt::GraphicsCaptureItem item,
+    static std::unique_ptr<D3DCaptureState> Create(D3DState* d3dState,
+                                                   winrt::GraphicsCaptureItem item,
                                                    const winrt::DirectXPixelFormat pixelFormat,
                                                    Box monitorSize,
                                                    const bool captureOutsideOfMonitor);
@@ -57,21 +93,20 @@ public:
     void StopCapture();
 };
 
-D3DCaptureState::D3DCaptureState(winrt::com_ptr<ID3D11Device> _d3dDevice,
+D3DCaptureState::D3DCaptureState(D3DState* _d3dState,
-                                 winrt::IDirect3DDevice _device,
                                  winrt::com_ptr<IDXGISwapChain1> _swapChain,
                                  winrt::com_ptr<ID3D11DeviceContext> _context,
                                  const winrt::GraphicsCaptureItem& item,
                                  winrt::DirectXPixelFormat _pixelFormat,
                                  Box _monitorArea,
                                  const bool _captureOutsideOfMonitor) :
-    d3dDevice{ std::move(_d3dDevice) },
+    d3dState{ _d3dState },
-    device{ std::move(_device) },
+    device{ _d3dState->d3dDeviceInspectable.as<winrt::IDirect3DDevice>() },
     swapChain{ std::move(_swapChain) },
     context{ std::move(_context) },
     frameSize{ item.Size() },
     pixelFormat{ std::move(_pixelFormat) },
-    framePool{ winrt::Direct3D11CaptureFramePool::CreateFreeThreaded(device, pixelFormat, 2, item.Size()) },
+    framePool{ winrt::Direct3D11CaptureFramePool::CreateFreeThreaded(device, pixelFormat, 1, item.Size()) },
     session{ framePool.CreateCaptureSession(item) },
     monitorArea{ _monitorArea },
     captureOutsideOfMonitor{ _captureOutsideOfMonitor }
@@ -89,7 +124,7 @@ winrt::com_ptr<ID3D11Texture2D> D3DCaptureState::CopyFrameToCPU(const winrt::com
     desc.BindFlags = 0;
 
     winrt::com_ptr<ID3D11Texture2D> cpuTexture;
-    winrt::check_hresult(d3dDevice->CreateTexture2D(&desc, nullptr, cpuTexture.put()));
+    winrt::check_hresult(d3dState->d3dDevice->CreateTexture2D(&desc, nullptr, cpuTexture.put()));
     context->CopyResource(cpuTexture.get(), frameTexture.get());
 
     return cpuTexture;
@@ -152,49 +187,14 @@ void D3DCaptureState::OnFrameArrived(const winrt::Direct3D11CaptureFramePool& se
     }
 }
 
-std::unique_ptr<D3DCaptureState> D3DCaptureState::Create(winrt::GraphicsCaptureItem item,
+std::unique_ptr<D3DCaptureState> D3DCaptureState::Create(D3DState* d3dState,
+                                                         winrt::GraphicsCaptureItem item,
                                                          const winrt::DirectXPixelFormat pixelFormat,
                                                          Box monitorArea,
                                                          const bool captureOutsideOfMonitor)
 {
     std::lock_guard guard{ gpuAccessLock };
 
-    winrt::com_ptr<ID3D11Device> d3dDevice;
-    UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
-#ifndef NDEBUG
-    flags |= D3D11_CREATE_DEVICE_DEBUG;
-#endif
-    HRESULT hr =
-        D3D11CreateDevice(nullptr,
-                          D3D_DRIVER_TYPE_HARDWARE,
-                          nullptr,
-                          flags,
-                          nullptr,
-                          0,
-                          D3D11_SDK_VERSION,
-                          d3dDevice.put(),
-                          nullptr,
-                          nullptr);
-    if (hr == DXGI_ERROR_UNSUPPORTED)
-    {
-        hr = D3D11CreateDevice(nullptr,
-                               D3D_DRIVER_TYPE_WARP,
-                               nullptr,
-                               flags,
-                               nullptr,
-                               0,
-                               D3D11_SDK_VERSION,
-                               d3dDevice.put(),
-                               nullptr,
-                               nullptr);
-    }
-    winrt::check_hresult(hr);
-    
-
-    auto dxgiDevice = d3dDevice.as<IDXGIDevice>();
-    winrt::com_ptr<IInspectable> d3dDeviceInspectable;
-    winrt::check_hresult(CreateDirect3D11DeviceFromDXGIDevice(dxgiDevice.get(), d3dDeviceInspectable.put()));
-
     const DXGI_SWAP_CHAIN_DESC1 desc = {
         .Width = static_cast<uint32_t>(item.Size().Width),
         .Height = static_cast<uint32_t>(item.Size().Height),
@@ -207,20 +207,21 @@ std::unique_ptr<D3DCaptureState> D3DCaptureState::Create(winrt::GraphicsCaptureI
         .AlphaMode = DXGI_ALPHA_MODE_PREMULTIPLIED,
     };
     winrt::com_ptr<IDXGIAdapter> adapter;
-    winrt::check_hresult(dxgiDevice->GetParent(winrt::guid_of<IDXGIAdapter>(), adapter.put_void()));
+    winrt::check_hresult(d3dState->dxgiDevice->GetParent(winrt::guid_of<IDXGIAdapter>(), adapter.put_void()));
     winrt::com_ptr<IDXGIFactory2> factory;
     winrt::check_hresult(adapter->GetParent(winrt::guid_of<IDXGIFactory2>(), factory.put_void()));
 
     winrt::com_ptr<IDXGISwapChain1> swapChain;
-    winrt::check_hresult(factory->CreateSwapChainForComposition(d3dDevice.get(), &desc, nullptr, swapChain.put()));
+    winrt::check_hresult(factory->CreateSwapChainForComposition(d3dState->d3dDevice.get(), &desc, nullptr, swapChain.put()));
 
     winrt::com_ptr<ID3D11DeviceContext> context;
-    d3dDevice->GetImmediateContext(context.put());
+    d3dState->d3dDevice->GetImmediateContext(context.put());
     winrt::check_bool(context);
+    auto contextMultithread = context.as<ID3D11Multithread>();
+    contextMultithread->SetMultithreadProtected(true);
 
     // We must create the object in a heap, since we need to pin it in memory to receive callbacks
-    auto statePtr = new D3DCaptureState{ d3dDevice,
+    auto statePtr = new D3DCaptureState{ d3dState,
-                                         d3dDeviceInspectable.as<winrt::IDirect3DDevice>(),
                                          std::move(swapChain),
                                          std::move(context),
                                          item,
@@ -236,7 +237,6 @@ D3DCaptureState::~D3DCaptureState()
     std::unique_lock callbackLock{ destructorMutex };
     StopCapture();
     framePool.Close();
-    device.Close();
 }
 
 void D3DCaptureState::StartSessionInPreferredMode()
@@ -332,12 +332,13 @@ void UpdateCaptureState(const CommonState& commonState,
     });
 }
 
-std::thread StartCapturingThread(const CommonState& commonState,
+std::thread StartCapturingThread(D3DState* d3dState,
+                                 const CommonState& commonState,
                                  Serialized<MeasureToolState>& state,
                                  HWND window,
-                                 MonitorInfo targetMonitor)
+                                 MonitorInfo monitor)
 {
-    return SpawnLoggedThread(L"Screen Capture thread", [&state, &commonState, targetMonitor, window] {
+    return SpawnLoggedThread(L"Screen Capture thread", [&state, &commonState, monitor, window, d3dState] {
         auto captureInterop = winrt::get_activation_factory<
             winrt::GraphicsCaptureItem,
             IGraphicsCaptureItemInterop>();
@@ -345,7 +346,7 @@ std::thread StartCapturingThread(const CommonState& commonState,
         winrt::GraphicsCaptureItem item = nullptr;
 
         winrt::check_hresult(captureInterop->CreateForMonitor(
-            targetMonitor.GetHandle(),
+            monitor.GetHandle(),
             winrt::guid_of<winrt::GraphicsCaptureItem>(),
             winrt::put_abi(item)));
 
@@ -354,8 +355,9 @@ std::thread StartCapturingThread(const CommonState& commonState,
             continuousCapture = state.global.continuousCapture;
         });
 
-        const auto monitorArea = targetMonitor.GetScreenSize(true);
+        const auto monitorArea = monitor.GetScreenSize(true);
-        auto captureState = D3DCaptureState::Create(item,
+        auto captureState = D3DCaptureState::Create(d3dState,
+                                                    item,
                                                     winrt::DirectXPixelFormat::B8G8R8A8UIntNormalized,
                                                     monitorArea,
                                                     !continuousCapture);

src/modules/MeasureTool/MeasureToolCore/ScreenCapturing.h

@@ -4,7 +4,17 @@
 
 #include <common/utils/serialized.h>
 
-std::thread StartCapturingThread(const CommonState& commonState,
+struct D3DState
+{
+    winrt::com_ptr<ID3D11Device> d3dDevice;
+    winrt::com_ptr<IDXGIDevice> dxgiDevice;
+    winrt::com_ptr<IInspectable> d3dDeviceInspectable;
+
+    D3DState();
+};
+
+std::thread StartCapturingThread(D3DState* d3dState,
+                                 const CommonState& commonState,
                                  Serialized<MeasureToolState>& state,
                                  HWND targetWindow,
                                  MonitorInfo targetMonitor);

src/modules/MeasureTool/MeasureToolCore/latch.h

@@ -0,0 +1,73 @@
+#pragma once
+
+#if __has_include(<latch>)
+#include <latch>
+using Latch = std::latch;
+#else
+#include <atomic>
+#include <cstddef>
+#include <limits.h>
+
+class Latch
+{
+public:
+    [[nodiscard]] static constexpr ptrdiff_t(max)() noexcept
+    {
+        return (1ULL << (sizeof(ptrdiff_t) * CHAR_BIT - 1)) - 1;
+    }
+
+    constexpr explicit Latch(const std::ptrdiff_t _Expected) noexcept :
+        _Counter{ _Expected }
+    {
+    }
+
+    Latch(const Latch&) = delete;
+    Latch& operator=(const Latch&) = delete;
+
+    void count_down(const ptrdiff_t _Update = 1) noexcept
+    {
+        const ptrdiff_t _Current = _Counter.fetch_sub(_Update) - _Update;
+        if (_Current == 0)
+        {
+            _Counter.notify_all();
+        }
+    }
+
+    [[nodiscard]] bool try_wait() const noexcept
+    {
+        return _Counter.load() == 0;
+    }
+
+    void wait() const noexcept
+    {
+        for (;;)
+        {
+            const ptrdiff_t _Current = _Counter.load();
+            if (_Current == 0)
+            {
+                return;
+            }
+            else
+                _Counter.wait(_Current, std::memory_order_relaxed);
+        }
+    }
+
+    void arrive_and_wait(const ptrdiff_t _Update = 1) noexcept
+    {
+        const ptrdiff_t _Current = _Counter.fetch_sub(_Update) - _Update;
+        if (_Current == 0)
+        {
+            _Counter.notify_all();
+        }
+        else
+        {
+            _Counter.wait(_Current, std::memory_order_relaxed);
+            wait();
+        }
+    }
+
+private:
+    std::atomic<std::ptrdiff_t> _Counter;
+};
+
+#endif

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -177,7 +177,7 @@
     <value>Draw feet on cross</value>
   </data>
   <data name="MeasureTool_DrawFeetOnCross.Description" xml:space="preserve">
-    <value>Adds feet to the end of cross lines. Always off for continuous capture.</value>
+    <value>Adds feet to the end of cross lines.</value>
   </data>
   <data name="MeasureTool_EnableMeasureTool.Header" xml:space="preserve">
     <value>Enable Screen Ruler</value>
@@ -2374,7 +2374,7 @@ Activate by holding the key for the character you want to add an accent to, then
     <value>Learn more about conflicting activation commands</value>
   </data>
   <data name="MeasureTool_ContinuousCapture_Information.Title" xml:space="preserve">
-    <value>The continuous capture mode will consume more resources when in use.  In addition, the UI will be slightly offset from the pointer position.</value>
+    <value>The continuous capture mode will consume more resources when in use.</value>
-    <comment>pointer as in mouse pointer.  resources refer to things like CPU, GPU, RAM</comment>
+    <comment>pointer as in mouse pointer. Resources refer to things like CPU, GPU, RAM</comment>
   </data>
 </root>