STRUCT C3_ISP_AE_ZONE_STATS(9)

💖 struct c3_isp_ae_zone_stats(9) — like, the whole entire vibe 💖

okay so bestie, buckle up, because we're diving into the kernel API manual for struct c3_isp_ae_zone_stats and honestly? it's giving "small struct, big energy." this is auto-exposure (AE) statistics for one single zone, and you're gonna understand it perfectly, no cap. 🦋

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✨ NAME ✨

struct c3_isp_ae_zone_stats — literally just AE statistics of a zone. one zone. that's the whole job. iconic behavior, honestly. 💅

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🎀 SYNOPSIS 🎀

struct c3_isp_ae_zone_stats {
    __u16 hist0;
    __u16 hist1;
    __u16 hist3;
    __u16 hist4;
 };

bestie, look at that. four members. four. and yes, you clocked it — there's no hist2 in there, and that is NOT a typo, so don't come for me. we'll get to that. 👀

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🌸 Members 🌸

• hist0 — the global normalized pixel count for bin 0. that's it, that's the one. 🍓
• hist1 — the global normalized pixel count for bin 1. yes queen, next bin. ✨
• hist3 — the global normalized pixel count for bin 3. skipping right past 2 like it owes her money. 💀
• hist4 — the global normalized pixel count for bin 4. last one, we made it. 🎉

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💜 Description 💜

so, the tea: AE zone stats is aligned with 8 bytes. remember that, it matters for the vibes (and the memory layout). 🔥

this is a 5-bin histogram, and here's the plot twist that makes it all make sense: the total sum is normalized to 0xffff. which means bin 2 isn't missing at all — it's just doing its own thing, living that math life:

hist2 = 0xffff - (hist0 + hist1 + hist3 + hist4)

so you never store it. you derive it. main character energy, honestly — the bin that doesn't even need to show up to be present. 💅 periodt.

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🌈 SEE ALSO 🌈

go read the kernel file ./include/uapi/linux/media/amlogic/c3-isp-config.h first, it's the source of truth and it ate. then there's a whole squad of friends, and yes, you should meet all of them, no skipping: 🫶

• struct c3_isp_awb_zone_stats(9)
• struct c3_isp_awb_stats(9)
• struct c3_isp_ae_stats(9)
• struct c3_isp_af_zone_stats(9)
• struct c3_isp_af_stats(9)
• struct c3_isp_stats_info(9)
• enum c3_isp_params_buffer_version(9)
• enum c3_isp_params_block_type(9)
• c3_isp_params_block_header(9)
• struct c3_isp_params_awb_gains(9)
• enum c3_isp_params_awb_tap_points(9)
• struct c3_isp_params_awb_config(9)
• enum c3_isp_params_ae_tap_points(9)
• struct c3_isp_params_ae_config(9)
• enum c3_isp_params_af_tap_points(9)
• struct c3_isp_params_af_config(9)
• struct c3_isp_params_pst_gamma(9)
• struct c3_isp_params_ccm(9)
• struct c3_isp_params_csc(9)
• struct c3_isp_params_blc(9)
• C3_ISP_PARAMS_MAX_SIZE(9)
• struct c3_isp_params_cfg(9)

it's a whole friend group, iykyk. 😭💖

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ngl, none of this is dangerous, it's just a stats struct living its truth. but the alignment and the 0xffff normalization are load-bearing, so don't go messing with those unless you want your histogram to have a bad day. 🙈

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and that's the page, bestie! this gem came out of ./include/uapi/linux/media/aml... and it's dated October 2026, section 9, all official and everything. you did amazing, mwah, slay, go forth and parse your zones. 👑💅✨🦋