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Bug 4925

Summary: X11: incorrect check for MIT-SHM extension availability
Product: SDL Reporter: Dmitry Levin <sdl.dl>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.10   
Hardware: All   
OS: Linux   
Attachments: SDL2-2.0.10-alt-have_mitshm.patch

Description Dmitry Levin 2020-01-04 12:55:21 UTC 
Created attachment 4149 [details]
SDL2-2.0.10-alt-have_mitshm.patch

Currently, the string returned by XDisplayName is used for the guess whether MIT_SHM extension is available.  Unfortunately, this approach does not work when X11 connection is established using a unix domain forwarding.

The correct method of checking MIT_SHM availability is XShmQueryExtension API.
Proposed patch is attached.
Comment 1 Sam Lantinga 2020-01-04 19:04:22 UTC 
Patch added, thanks!
https://hg.libsdl.org/SDL/rev/0a7e1a5fa9df