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Review follow-up: - The HDR/WCG decision was taken once when the conversion was created. HDR can be switched on or off, and a WCG desktop can turn into an HDR one, without the duplication being invalidated, so the choice between "divide by the SDR white level" and "no scaling" could go stale. The once-a-second refresh now re-reads it: it keeps an IDXGIFactory1, and when IsCurrent reports FALSE it creates a fresh factory and re-finds the output by GDI name, since a stale factory's outputs keep stale descriptions (this is the procedure the GetDesc1 docs require). On a change it switches modes, re-reads the white level and updates the shader constant; an unreadable level keeps the last known one. - Float frames are only requested when IDXGIOutput6 exists, as Microsoft's duplication sample does. That interface is also what tells HDR from WCG, so there is no longer a state where FP16 is requested without being able to interpret it. IDXGIOutput6 dates from Windows 10 1703, not 1803 as the previous commit said; 1803 added IDXGIFactory6. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01RLb1dNdhFqUQExJPANjo1F