Software-decoded HDR always collapsed to SDR on Android: the EGL
window surface carried no colorspace, so PQ/HLG content that fell back
to software decode rendered through an SDR surface, and Android was
excluded from the hdr-enabled path outright.
The GL vo now requests a BT2020-PQ window surface (fork patch, pinned
libmpv v1.1.3) and Android joins the hdr-enabled path, so software
decode keeps HDR scanout and tone mapping happens only when the
display genuinely cannot show HDR.
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