Playing HDR content tone-mapped to an SDR display on Windows-on-ARM stutters heavily and flickers in brightness: dynamic peak detection moves the tone-mapping parameters every frame, libplacebo regenerates its tone-map and gamut-map shader LUTs each time, and Qualcomm's Adreno D3D11 driver takes tens of milliseconds per regeneration - roughly 100 ms of work against a 42 ms frame budget at 24 fps.
Scan the DXGI adapter list for a Qualcomm vendor id and set hdr-compute-peak=no when one is present, keeping auto elsewhere; static metadata-driven tone mapping generates its LUTs once.
close#2191
edde746