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@@ -1316,3 +1316,43 @@ Dimension VideoDriver_Win32::GetScreenSi
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{
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return { static_cast<uint>(GetSystemMetrics(SM_CXSCREEN)), static_cast<uint>(GetSystemMetrics(SM_CYSCREEN)) };
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}
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float VideoDriver_Win32::GetDPIScale()
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{
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typedef UINT (WINAPI *PFNGETDPIFORWINDOW)(HWND hwnd);
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typedef UINT (WINAPI *PFNGETDPIFORSYSTEM)(VOID);
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typedef HRESULT (WINAPI *PFNGETDPIFORMONITOR)(HMONITOR hMonitor, int dpiType, UINT *dpiX, UINT *dpiY);
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static PFNGETDPIFORWINDOW _GetDpiForWindow = nullptr;
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static PFNGETDPIFORSYSTEM _GetDpiForSystem = nullptr;
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static PFNGETDPIFORMONITOR _GetDpiForMonitor = nullptr;
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static bool init_done = false;
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if (!init_done) {
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init_done = true;
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_GetDpiForWindow = (PFNGETDPIFORWINDOW)GetProcAddress(GetModuleHandle(_T("User32")), "GetDpiForWindow");
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_GetDpiForSystem = (PFNGETDPIFORSYSTEM)GetProcAddress(GetModuleHandle(_T("User32")), "GetDpiForSystem");
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_GetDpiForMonitor = (PFNGETDPIFORMONITOR)GetProcAddress(LoadLibrary(_T("Shcore.dll")), "GetDpiForMonitor");
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}
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UINT cur_dpi = 0;
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if (cur_dpi == 0 && _GetDpiForWindow != nullptr && _wnd.main_wnd != nullptr) {
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/* Per window DPI is supported since Windows 10 Ver 1607. */
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cur_dpi = _GetDpiForWindow(_wnd.main_wnd);
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}
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if (cur_dpi == 0 && _GetDpiForMonitor != nullptr && _wnd.main_wnd != nullptr) {
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/* Per monitor is supported since Windows 8.1. */
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UINT dpiX, dpiY;
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if (SUCCEEDED(_GetDpiForMonitor(MonitorFromWindow(_wnd.main_wnd, MONITOR_DEFAULTTOPRIMARY), 0 /* MDT_EFFECTIVE_DPI */, &dpiX, &dpiY))) {
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cur_dpi = dpiX; // X and Y are always identical.
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}
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}
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if (cur_dpi == 0 && _GetDpiForSystem != nullptr) {
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/* Fall back to system DPI. */
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cur_dpi = _GetDpiForSystem();
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}
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return cur_dpi > 0 ? cur_dpi / 96.0f : 1.0f; // Default Windows DPI value is 96.
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}
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