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Win32: Fix bad content scale on monitor disconnect

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The monitor handle could have become invalid just before the call to
GetDpiForMonitor.  It was possible for both window and monitor content
scale queries.

This ensures both that an appropriate error is emitted and that the
retrieved values are zero on error.

Fixes #1615

(cherry picked from commit fbfd7e65c8)
This commit is contained in:
Camilla Löwy
2021-12-01 17:55:16 +01:00
parent 84c881c1a8
commit e10def6de7
3 changed files with 16 additions and 1 deletions
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src/win32_monitor.c
+12 -1
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@@ -318,8 +318,19 @@ void _glfwGetMonitorContentScaleWin32(HMONITOR handle, float* xscale, float* ysc
{
UINT xdpi, ydpi;
if (xscale)
*xscale = 0.f;
if (yscale)
*yscale = 0.f;
if (IsWindows8Point1OrGreater())
GetDpiForMonitor(handle, MDT_EFFECTIVE_DPI, &xdpi, &ydpi);
{
if (GetDpiForMonitor(handle, MDT_EFFECTIVE_DPI, &xdpi, &ydpi) != S_OK)
{
_glfwInputError(GLFW_PLATFORM_ERROR, "Win32: Failed to query monitor DPI");
return;
}
}
else
{
const HDC dc = GetDC(NULL);