XdbeQueryExtension(3)

💖 XdbeQueryExtension(3) — the X FUNCTIONS girlies know 💖

okay bestie, welcome to the XdbeQueryExtension page, from the X FUNCTIONS corner of the manual-verse ✨ this is your lil' vibe-check function — it tells you what DBE protocol version the server is running before you go doing literally anything else. 🦋

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✨ NAME ✨

XdbeQueryExtension — returns the version of DBE supported by the server. periodt. 💅

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🌸 SYNOPSIS 🌸

#include <X11/extensions/Xdbe.h>

Status XdbeQueryExtension(
    Display *dpy,
    int     *major_version_return,
    int     *minor_version_return)

like. look at her. three args, one Status, so clean. 🎀

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👑 DESCRIPTION 👑

so what does she actually do? she sets major_version_return and minor_version_return to the major and minor DBE protocol version supported by the server. that's the whole assignment and she ate. 🔥

if the DBE library is compatible with the version returned by the server, this function returns non-zero. slay. 💖

but bestie, listen — she returns zero if any of these happen:

• dpy does not support the DBE extension
• there was an error during communication with the server
• the server and library protocol versions are incompatible

🚨 THE RULE, and I cannot stress this enough: no other Xdbe functions may be called before this function. like, none of them. if a client violates this rule, the effects of all subsequent Xdbe calls that it makes are undefined. undefined!! 😭 not "probably fine", not "eh it'll work out" — straight up undefined behaviour. so do the vibe check first, always. 🫶

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🦋 SEE ALSO 🦋

go read these next, i'm obsessed with all of them:

• DBE
• XdbeAllocateBackBufferName()
• XdbeBeginIdiom()
• XdbeDeallocateBackBufferName()
• XdbeEndIdiom()
• XdbeFreeVisualInfo()
• XdbeGetBackBufferAttributes()
• XdbeGetVisualInfo()
• XdbeSwapBuffers()

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and that's the whole page, no cap 💜 this one's from X Version 11, libXext 1.3.6, and yeah it's literally titled XdbeQueryExtension(3) — go query that extension, bestie, you got this 🌈✨💅