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have_mitshm: use XShmQueryExtension to check for MIT-SHM extension 

Do not try to guess MIT_SHM extension availability from the string
returned by XDisplayName, use the appropriate API instead.

This fixes SDL2 inside hasher.
Dmitry V. Levin 2020-01-04 11:03:04 -08:00
parent cdbeae521e
commit ed514cd0e4
1 changed files with 3 additions and 7 deletions
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10
src/video/x11/SDL_x11framebuffer.c
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@ -40,14 +40,10 @@ static int shm_errhandler(Display *d, XErrorEvent *e)
return(X_handler(d,e));
}
static SDL_bool have_mitshm(void)
static SDL_bool have_mitshm(Display *dpy)
{
/* Only use shared memory on local X servers */
if ( (SDL_strncmp(X11_XDisplayName(NULL), ":", 1) == 0) ||
(SDL_strncmp(X11_XDisplayName(NULL), "unix:", 5) == 0) ) {
return SDL_X11_HAVE_SHM;
}
return SDL_FALSE;
return X11_XShmQueryExtension(dpy) ? SDL_X11_HAVE_SHM : SDL_FALSE;
}
#endif /* !NO_SHARED_MEMORY */
@ -86,7 +82,7 @@ X11_CreateWindowFramebuffer(_THIS, SDL_Window * window, Uint32 * format,
/* Create the actual image */
#ifndef NO_SHARED_MEMORY
if (have_mitshm()) {
if (have_mitshm(display)) {
XShmSegmentInfo *shminfo = &data->shminfo;
shminfo->shmid = shmget(IPC_PRIVATE, window->h*(*pitch), IPC_CREAT | 0777);