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Add: [Win32] Automatic zoom level suggestion for Win32 video driver.

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The zoom level suggestion is based on the DPI scaling set in Windows.
We use 150% scaling as the threshold for 2X zoom and 300% scaling
as the threshold for 4X zoom.
This commit is contained in:
Michael Lutz 2021-01-08 22:17:04 +01:00
parent f137b3057a
commit f175e38666
2 changed files with 42 additions and 0 deletions
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40
src/video/win32_v.cpp
View File

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

2
src/video/win32_v.h
View File

@ -43,6 +43,8 @@ public:
protected:
Dimension GetScreenSize() const override;
float GetDPIScale() override;
};
/** The factory for Windows' video driver. */