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#include <d2d1.h>
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#include <dwmapi.h>
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#include <dwrite.h>
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#include <minwindef.h>
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#include <windef.h>
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#include <windows.h>
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#pragma comment(lib, "d2d1")
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#pragma comment(lib, "dwrite")
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#pragma comment(lib, "dwmapi.lib")
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ID2D1Factory *pD2DFactory = nullptr;
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ID2D1HwndRenderTarget *pRenderTarget = nullptr;
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ID2D1SolidColorBrush *pBrush = nullptr;
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IDWriteFactory *pDWriteFactory = nullptr;
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IDWriteTextFormat *pTextFormat = nullptr;
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LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
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FLOAT GetWindowScale(HWND hwnd);
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bool InitD2DAndDWrite()
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{
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HRESULT hr = D2D1CreateFactory( //
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D2D1_FACTORY_TYPE_SINGLE_THREADED, //
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&pD2DFactory //
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);
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if (FAILED(hr))
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return false;
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hr = DWriteCreateFactory( //
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DWRITE_FACTORY_TYPE_SHARED, //
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__uuidof(IDWriteFactory), //
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reinterpret_cast<IUnknown **>(&pDWriteFactory) //
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);
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if (FAILED(hr))
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return false;
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hr = pDWriteFactory->CreateTextFormat(L"Segoe UI", //
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nullptr, //
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DWRITE_FONT_WEIGHT_NORMAL, //
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DWRITE_FONT_STYLE_NORMAL, //
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DWRITE_FONT_STRETCH_NORMAL, //
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24.0f, //
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L"en-us", //
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&pTextFormat //
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);
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if (FAILED(hr))
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return false;
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return true;
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}
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bool InitD2DRenderTarget(HWND hwnd)
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{
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if (!pD2DFactory)
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return false;
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RECT rc;
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GetClientRect(hwnd, &rc);
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auto renderTargetProps = D2D1::RenderTargetProperties( //
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D2D1_RENDER_TARGET_TYPE_DEFAULT, //
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D2D1::PixelFormat( //
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DXGI_FORMAT_UNKNOWN, //
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D2D1_ALPHA_MODE_PREMULTIPLIED //
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) //
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);
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auto hwndRenderTargetProps = D2D1::HwndRenderTargetProperties( //
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hwnd, //
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D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top), //
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D2D1_PRESENT_OPTIONS_IMMEDIATELY //
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);
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HRESULT hr = pD2DFactory->CreateHwndRenderTarget( //
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renderTargetProps, //
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hwndRenderTargetProps, //
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&pRenderTarget //
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);
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if (SUCCEEDED(hr))
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{
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hr = pRenderTarget->CreateSolidColorBrush( //
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D2D1::ColorF(D2D1::ColorF::White), //
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&pBrush //
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);
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}
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return SUCCEEDED(hr);
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}
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void OnPaint(HWND hwnd)
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{
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if (!pRenderTarget)
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return;
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pRenderTarget->BeginDraw();
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// Clear baakground to transparent
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// pRenderTarget->Clear(D2D1::ColorF(0, 0, 0, 0));
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pRenderTarget->Clear(D2D1::ColorF(25 / 255.0, 25 / 255.0, 25 / 255.0, 0.5));
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/*
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FLOAT scale = GetWindowScale(hwnd);
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D2D1_RECT_F borderRect = D2D1::RectF( //
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static_cast<FLOAT>(0), //
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static_cast<FLOAT>(0), //
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static_cast<FLOAT>(600 / scale), //
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static_cast<FLOAT>(600 / scale) //
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);
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pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::White, 1.0f));
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E
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pRenderTarget->FillRectangle(D2D1::RectF(50, 50, 400, 300), pBrush)
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pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::Red, 1.0f));
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pRenderTarget->FillRectangle(D2D1::RectF(200, 200, 500, 400), pBrush);
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pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::Green, 0.3f));
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pRenderTarget->FillRectangle(D2D1::RectF(300, 100, 600, 250), pBrush);
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pBrush->SetColor(D2D1::ColorF(D2D1::ColorF::White, 1.0f)); //
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pRenderTarget->DrawTextW( //
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L"Transparent Window and Direct2D", //
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31, //
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pTextFormat, //
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D2D1::RectF(5, 5, 600, 200), //
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pBrush //
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);
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*/
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HRESULT hr = pRenderTarget->EndDraw();
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if (hr == D2DERR_RECREATE_TARGET)
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{
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pRenderTarget->Release();
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InitD2DRenderTarget(hwnd);
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}
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}
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HWND CreateTransparentWindow(HINSTANCE hInstance)
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{
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WNDCLASS wc = {0};
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wc.lpfnWndProc = WndProc;
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wc.style = CS_HREDRAW | CS_VREDRAW;
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wc.hInstance = hInstance;
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wc.lpszClassName = L"TransparentWindowClass";
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if (!RegisterClass(&wc))
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return nullptr;
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HWND hwnd = CreateWindowEx(WS_EX_LAYERED, //
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wc.lpszClassName, //
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L"TransparentWindow", //
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WS_POPUP, //
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100, 100, 600, 600, //
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nullptr, nullptr, hInstance, nullptr);
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if (hwnd)
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{
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SetLayeredWindowAttributes(hwnd, 0, 255, LWA_ALPHA);
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MARGINS mar = {-1};
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DwmExtendFrameIntoClientArea(hwnd, &mar);
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}
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return hwnd;
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}
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LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
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{
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switch (message)
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{
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case WM_CREATE:
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InitD2DRenderTarget(hwnd);
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return 0;
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case WM_PAINT:
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case WM_DISPLAYCHANGE:
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OnPaint(hwnd);
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ValidateRect(hwnd, nullptr);
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return 0;
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case WM_MOUSEMOVE: {
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float x = (float)LOWORD(lParam);
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float y = (float)HIWORD(lParam);
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RECT rc;
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GetClientRect(hwnd, &rc);
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if (x >= rc.left && x <= rc.right && y >= rc.top && y <= rc.bottom)
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{
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SetCursor(LoadCursor(nullptr, IDC_ARROW));
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}
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break;
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}
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case WM_DESTROY:
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PostQuitMessage(0);
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return 0;
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default:
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return DefWindowProc(hwnd, message, wParam, lParam);
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}
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return 0;
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}
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int APIENTRY wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
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LPWSTR lpCmdLine, int nCmdShow)
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{
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SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2);
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if (!InitD2DAndDWrite())
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return -1;
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HWND hwnd = CreateTransparentWindow(hInstance);
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if (!hwnd)
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return -1;
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ShowWindow(hwnd, nCmdShow);
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UpdateWindow(hwnd);
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MSG msg;
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while (GetMessage(&msg, nullptr, 0, 0))
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{
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TranslateMessage(&msg);
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DispatchMessage(&msg);
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}
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if (pBrush)
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pBrush->Release();
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if (pRenderTarget)
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pRenderTarget->Release();
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if (pDWriteFactory)
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pDWriteFactory->Release();
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if (pTextFormat)
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pTextFormat->Release();
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if (pD2DFactory)
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pD2DFactory->Release();
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return (int)msg.wParam;
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}
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FLOAT GetWindowScale(HWND hwnd)
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{
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UINT dpi = GetDpiForWindow(hwnd);
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FLOAT scale = dpi / 96.0f;
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return scale;
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}
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