STRUCT C3_ISP_AF_ZONE_STATS(9)

💅 struct c3_isp_af_zone_stats(9) — the AF zone tea, served fresh ✨

okay so bestie, welcome to section 9 of the Kernel API Manual 🎀 and today's main character is struct c3_isp_af_zone_stats — literally the AF statistics of a zone, no cap 💖

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🌸 NAME 🌸

struct c3_isp_af_zone_stats — AF statistics of a zone 🦋

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✨ SYNOPSIS ✨

struct c3_isp_af_zone_stats {
    __u16 i2_mat;
    __u16 i4_mat;
    __u16 e4_mat;
    __u16 e4_exp : 5;
    __u16 i2_exp : 5;
    __u16 i4_exp : 6;
 };

that's the whole struct, bestie — she's compact and she knows it 💅

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👑 Members 👑

• i2_mat — the mantissa of zonal squared image pixel sum 🍓 like, the squared-image-pixel-sum mantissa, but make it zonal.
• i4_mat — the mantissa of zonal quartic image pixel sum ✨ quartic this time, still zonal, still a mantissa.
• e4_mat — the mantissa of zonal multi-directional quartic edge sum 🌈 multi-directional! quartic! edge sum! her mantissa!
• e4_exp — the exponent of zonal multi-directional quartic edge sum 💜 the exponent partner-in-crime to e4_mat.
• i2_exp — the exponent of zonal squared image pixel sum 🦋 the exponent half of the squared image story.
• i4_exp — the exponent of zonal quartic image pixel sum 🎀 and the exponent half of the quartic image story. slay.

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🧚 Description 🧚

okay so real talk — AF zone stats is aligned with 8 bytes ⭐ that's the vibe, that's the alignment, periodt.

the zonal accumulated contrast metrics are stored in floating point format with 16 bits mantissa and 5 or 6 bits exponent 💀 (yes, either 5 or 6, depending on which field you're looking at — look at the bitfields above, iykyk 🙈).

and apart from the contrast metrics? we also accumulate squared image and quartic image data over the zone 💖 so she's out here holding contrast metrics and pixel data, highkey doing the most 🔥

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🫶 SEE ALSO 🫶

• Kernel file ./include/uapi/linux/media/amlogic/c3-isp-config.h 👑 (this is where she lives, go say hi)
• struct c3_isp_awb_zone_stats(9)
• struct c3_isp_awb_stats(9)
• struct c3_isp_ae_zone_stats(9)
• struct c3_isp_ae_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)

like, the whole friend group fr fr 💜 go read them all, they're iconic individually and devastating together 🌸

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💀 friendly reminder: this page is from ./include/uapi/linux/media/aml… and it's dated October 2026 — so yeah, it's giving time traveler, we love that for us 🦋

and that's the page, bestie!! mwah 💋 — signed, your fav man page, struct c3_isp_af_zone_stats(9), Kernel API Manual, October 2026 🌈✨🎀