https://learn.microsoft.com/en-us/windows/win32/api/dwrite_1/nf-dwrite_1-idwriterenderingparams1-getgrayscaleenhancedcontrast
IDWriteRenderingParams1::GetGrayscaleEnhancedContrast (dwrite_1.h) - Win32 apps | Microsoft Learn
Gets the amount of contrast enhancement to use for grayscale antialiasing.
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