drm_mode_legacy_fb_format(9)

💅 drm_mode_legacy_fb_format(9) — the Kernel API Manual page you actually wanna read

okay so bestie, welcome to the Kernel API Manual, section 9, and today's main character is drm_mode_legacy_fb_format. it's a tiny little function, it's giving "one job and it does it," and honestly? we respect it. 🎀

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✨ NAME ✨

drm_mode_legacy_fb_format — compute a drm fourcc code from a legacy description 🦋

like, you hand it the old-school way of describing a pixel format, and it hands you back the fancy drm fourcc code. glow-up achieved, no cap.

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🌸 SYNOPSIS 🌸

uint32_t drm_mode_legacy_fb_format (uint32_t bpp , uint32_t depth );

two uint32_ts walk in, one uint32_t walks out. that's the whole vibe. ✨

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💖 ARGUMENTS 💖

• bpp — bits per pixels. yes, "pixels," plural, that's literally what the page says and I'm not gonna lie to you about it. it's how many bits a pixel is packing. 🍓
• depth — bit depth per pixel. the depth-y part of the situation. 💜

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👑 DESCRIPTION 👑

Computes a drm fourcc pixel format code for the given bpp/depth values.

that's it. that's the whole description. it takes your legacy bpp/depth combo, does some thinking, and returns the drm fourcc pixel format code that matches. short king of a function, fr fr. 🫶

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🦋 SEE ALSO 🦋

• Kernel file ./drivers/gpu/drm/drm_fourcc.c — the actual source, if you wanna go read the receipts 💅
• drm_driver_legacy_fb_format(9)
• drm_driver_color_mode_format(9)
• drm_format_info(9)
• drm_get_format_info(9)
• drm_format_info_block_width(9)
• drm_format_info_block_height(9)
• drm_format_info_bpp(9)
• drm_format_info_min_pitch(9)

the whole format-info friend group, plus the driver-level legacy/colour-mode counterparts. iconic lineup, go read them all. 🌈

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quick reminder bestie: the bpp/depth pairing is the legacy description. this function is the translator, not the source of truth. 💀

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and that's the page!! 🎀 brought to you from ./drivers/gpu/drm, dated October 2026, in the Kernel API Manual — stay slaying, stay format-correct, and remember: fourcc codes are forever. 💖✨👑