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Win32: Add fallbacks for DPI and video mode queries

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If GetDpiForMonitor fails, refresh monitor handle and retry, then fall back to USER_DEFAULT_SCREEN_DPI. If EnumDisplaySettingsW fails, fall back to desktop resolution and safe defaults.

Closes #2764
This commit is contained in:
Adam 2025-09-07 20:12:15 +02:00
parent 8e15281d34
commit e0b301337c
1 changed files with 50 additions and 3 deletions
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53
src/win32_monitor.c
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@ -374,7 +374,47 @@ void _glfwGetMonitorPosWin32(_GLFWmonitor* monitor, int* xpos, int* ypos)
void _glfwGetMonitorContentScaleWin32(_GLFWmonitor* monitor,
float* xscale, float* yscale)
{
_glfwGetHMONITORContentScaleWin32(monitor->win32.handle, xscale, yscale);
UINT xdpi = USER_DEFAULT_SCREEN_DPI, ydpi = USER_DEFAULT_SCREEN_DPI;
if (IsWindows8Point1OrGreater())
{
HRESULT hr = GetDpiForMonitor(monitor->win32.handle,
MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
if (FAILED(hr) || xdpi == 0 || ydpi == 0)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to query monitor DPI, retrying with refreshed handle");
// Try to refresh the monitor handle and query again
EnumDisplayMonitors(NULL, NULL, monitorCallback, (LPARAM) monitor);
if (monitor->win32.handle)
{
hr = GetDpiForMonitor(monitor->win32.handle,
MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
if (FAILED(hr) || xdpi == 0 || ydpi == 0)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to query monitor DPI, using fallback");
xdpi = ydpi = USER_DEFAULT_SCREEN_DPI;
}
}
}
}
else
{
HDC dc = GetDC(NULL);
if (dc)
{
xdpi = GetDeviceCaps(dc, LOGPIXELSX);
ydpi = GetDeviceCaps(dc, LOGPIXELSY);
ReleaseDC(NULL, dc);
}
}
if (xscale)
*xscale = xdpi / (float) USER_DEFAULT_SCREEN_DPI;
if (yscale)
*yscale = ydpi / (float) USER_DEFAULT_SCREEN_DPI;
}
void _glfwGetMonitorWorkareaWin32(_GLFWmonitor* monitor,
@ -479,8 +519,15 @@ GLFWbool _glfwGetVideoModeWin32(_GLFWmonitor* monitor, GLFWvidmode* mode)
if (!EnumDisplaySettingsW(monitor->win32.adapterName, ENUM_CURRENT_SETTINGS, &dm))
{
_glfwInputError(GLFW_PLATFORM_ERROR, "Win32: Failed to query display settings");
return GLFW_FALSE;
_glfwInputError(GLFW_PLATFORM_ERROR,
"Win32: Failed to query display settings, using fallback");
mode->width = GetSystemMetrics(SM_CXSCREEN);
mode->height = GetSystemMetrics(SM_CYSCREEN);
mode->refreshRate = 60;
mode->redBits = mode->greenBits = mode->blueBits = 8;
return GLFW_TRUE;
}
mode->width = dm.dmPelsWidth;