drm_color_lut_extract(9)

📦 version 7.3.1, in nixpkgs unstable

💅 drm_color_lut_extract(9) 💅

okay so bestie, welcome to the kernel API manual — this one lives in the drm_color_lut_extract(9) girlie-verse and she is specifically about clamping and rounding LUT entries. yes, that's the whole vibe. let's get into it 🎀

✨ SYNOPSIS ✨

u32 drm_color_lut_extract(u32 user_input, int bit_precision);

that's the signature, no cap. two args in, one u32 out. 🦋

🌸 ARGUMENTS 🌸

  • user_input — the input value, fr. this is the thing you're feeding in.
  • bit_precision — the number of bits the hw LUT actually supports. like, how much precision your hardware can even handle. know your limits, king 👑

💖 DESCRIPTION 💖

okay so here's the tea: this function extracts a degamma/gamma LUT value that the user handed over (in the form of drm_color_lut entries) and rounds it to the precision supported by the hardware. it does this following the OpenGL int<->float conversion rules — see, e.g., the OpenGL 4.6 specification, section 2.3.5 Fixed-Point Data Conversions. literally iconic behavior ✨

so yeah: clamp, round, ship it. the hardware gets a value it can actually deal with, and everybody's happy 🫶

🦋 SEE ALSO 🦋

kernel file ./include/drm/drm_color_mgmt.h, plus these besties:

go read them, iyk yk 💅

ngl this one's short and sweet — but the rounding rules matter, so don't just skim and assume. read the OpenGL spec reference if you wanna be that girl 🌈

okay that's the whole page, bestie, hope you ate it up 💜 this lil number came out of ./include/drm in October 2026 — signed, sealed, and slayed by the Kernel API Manual crew 🎀⭐👑

📦 where this page comes from