diff options
Diffstat (limited to 'win32/PlatWin.cxx')
| -rw-r--r-- | win32/PlatWin.cxx | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/win32/PlatWin.cxx b/win32/PlatWin.cxx index bb808b4e7..c97b9283b 100644 --- a/win32/PlatWin.cxx +++ b/win32/PlatWin.cxx @@ -157,11 +157,15 @@ GetSystemMetricsForDpiSig fnGetSystemMetricsForDpi = nullptr; using AdjustWindowRectExForDpiSig = BOOL(WINAPI *)(LPRECT lpRect, DWORD dwStyle, BOOL bMenu, DWORD dwExStyle, UINT dpi); AdjustWindowRectExForDpiSig fnAdjustWindowRectExForDpi = nullptr; +using SetThreadDpiAwarenessContextSig = DPI_AWARENESS_CONTEXT(WINAPI *)(DPI_AWARENESS_CONTEXT); +SetThreadDpiAwarenessContextSig fnSetThreadDpiAwarenessContext = nullptr; + void LoadDpiForWindow() noexcept { HMODULE user32 = ::GetModuleHandleW(L"user32.dll"); fnGetDpiForWindow = DLLFunction<GetDpiForWindowSig>(user32, "GetDpiForWindow"); fnGetSystemMetricsForDpi = DLLFunction<GetSystemMetricsForDpiSig>(user32, "GetSystemMetricsForDpi"); fnAdjustWindowRectExForDpi = DLLFunction<AdjustWindowRectExForDpiSig>(user32, "AdjustWindowRectExForDpi"); + fnSetThreadDpiAwarenessContext = DLLFunction<SetThreadDpiAwarenessContextSig>(user32, "SetThreadDpiAwarenessContext"); using GetDpiForSystemSig = UINT(WINAPI *)(void); GetDpiForSystemSig fnGetDpiForSystem = DLLFunction<GetDpiForSystemSig>(user32, "GetDpiForSystem"); @@ -358,6 +362,25 @@ struct FontDirectWrite : public FontWin { } +HMONITOR MonitorFromWindow(HWND hWnd) noexcept { + constexpr DWORD monitorFlags = MONITOR_DEFAULTTONEAREST; + + if (!fnSetThreadDpiAwarenessContext) { + return ::MonitorFromWindow(hWnd, monitorFlags); + } + + // Temporarily switching to PerMonitorV2 to retrieve correct monitor via MonitorFromRect() in case of active GDI scaling. + const DPI_AWARENESS_CONTEXT oldContext = fnSetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2); + PLATFORM_ASSERT(oldContext != nullptr); + + RECT rect; + ::GetWindowRect(hWnd, &rect); + const HMONITOR monitor = ::MonitorFromRect(&rect, monitorFlags); + + fnSetThreadDpiAwarenessContext(oldContext); + return monitor; +} + std::shared_ptr<Font> Font::Allocate(const FontParameters &fp) { #if defined(USE_D2D) if (fp.technology != Technology::Default) { |