STRUCT RPPX1_EXM_STATS(9)

💖 NAME 💖

ok so bestie, meet struct rppx1_exm_stats — it's the Exposure measurement struct, and honestly? it's iconic. 🎀

(this lil guy lives in the Kernel API Manual, section 9, and yes we're getting into it 💅)

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✨ SYNOPSIS ✨

here's the actual shape of it, no cap, copy it exactly:

struct rppx1_exm_stats {
    struct v4l2_isp_block_header header;
    __u32 exp_mean[RPPX1_EXM_NUM_WIN];
    __u32 reserved;
 };

that's it. that's the whole vibe. 🦋

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🌸 Members 🌸

• header — the block header, and it's got a whole identity: its type is RPPX1_STATS_BLOCK_TYPE_EXM_PRE1. main character energy fr. 👑
• exp_mean — the mean luminance values per block, up to 20-bit. one per window, an array of them, RPPX1_EXM_NUM_WIN of them to be exact. the way it just holds all those means... 🥺
• reserved — padding. that's it. that's all she does. not me feeling a little bad for it 😭 but hey, every struct needs a quiet one. 🫶

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💜 Description 💜

okay so here's what this whole thing is for: RPP-X1 exposure measurement calculates the mean value on 25 programmable windows on the input picture. 🧚

twenty-five. five-by-five. the whole grid getting its own little mean. lowkey obsessed with the symmetry ngl. ✨

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🌈 SEE ALSO 🌈

literally the whole friend group, gather round 🫶 — kernel file ./include/uapi/linux/media/dreamchip/rppx1-config.h, plus:

• struct rppx1_window(9)
• enum rppx1_meas_chan(9)
• enum rppx1_params_block_type(9)
• enum rppx1_wbmeas_mode(9)
• struct rppx1_wbmeas_params(9)
• struct rppx1_awbg_params(9)
• enum rppx1_exm_mode(9)
• struct rppx1_exm_params(9)
• enum rppx1_hist_mode(9)
• struct rppx1_hist_params(9)
• struct rppx1_bls_fixed(9)
• enum rppx1_bls_mode(9)
• enum rppx1_bls_win_en(9)
• struct rppx1_bls_params(9)
• struct rppx1_ccor_params(9)
• struct rppx1_lsc_params(9)
• enum rppx1_ga_seg_mode(9)
• struct rppx1_ga_params(9)
• struct rppx1_lin_params(9)
• RPPX1_PARAMS_MAX_SIZE(9)
• enum rppx1_stats_block_type(9)
• struct rppx1_wbmeas_stats(9)
• struct rppx1_hist_stats(9)
• RPPX1_STATS_MAX_SIZE(9)

like I said. the entire group chat. 💀🔥

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heads up bestie 💅 — this page is straight out of ./include/uapi/linux/media/dre..., and it's dated October 2026. so yeah, it's giving time traveler. 🕰️✨

k that's the whole page, ily, go read the other structs now 🎀💖🌸