/* Test each depth not explicitly advertised to see if pixmap creation
* succeeds: if it does, that depth is usable. */
static int
pixmap_depths_usable (xcb_connection_t *c, uint32_t missing, xcb_pixmap_t pixmap, xcb_drawable_t root)
{
xcb_void_cookie_t create_cookie[32] = { { 0 } };
xcb_void_cookie_t free_cookie[32] = { { 0 } };
int d;
int success = 1;
for (d = 1; d <= 32; d++)
if (missing & DEPTH_MASK(d))
{
create_cookie[d - 1] = xcb_create_pixmap_checked (c, d, pixmap, root, 1, 1);
free_cookie[d - 1] = xcb_free_pixmap_checked (c, pixmap);
if (!create_cookie[d - 1].sequence || !free_cookie[d - 1].sequence)
{
success = 0;
break;
}
}
for (d = 0; d < 32; d++)
if (create_cookie[d].sequence || free_cookie[d].sequence)
{
xcb_generic_error_t *create_error = xcb_request_check (c, create_cookie[d]);
xcb_generic_error_t *free_error = xcb_request_check (c, free_cookie[d]);
success = success && !create_error;
free(create_error);
free(free_error);
}
return success;
}
static int
XRenderDepthCheckErrorHandler (Display *dpy, XErrorEvent *evt)
{
if (evt->request_code == X_CreatePixmap && evt->error_code == BadValue)
{
DepthCheckPtr d;
_XLockMutex(_Xglobal_lock);
for (d = depthChecks; d; d = d->next)
if (d->dpy == dpy)
{
if ((long) (evt->serial - d->serial) >= 0)
d->missing |= DEPTH_MASK(evt->resourceid);
break;
}
_XUnlockMutex (_Xglobal_lock);
}
return 0;
}
static Bool
XRenderHasDepths (Display *dpy)
{
int s;
for (s = 0; s < ScreenCount (dpy); s++)
{
CARD32 depths = 0;
CARD32 missing;
Screen *scr = ScreenOfDisplay (dpy, s);
int d;
for (d = 0; d < scr->ndepths; d++)
depths |= DEPTH_MASK(scr->depths[d].depth);
missing = ~depths & REQUIRED_DEPTHS;
if (missing)
{
DepthCheckRec dc, **dp;
XErrorHandler previousHandler;
/*
* Ok, this is ugly. It should be sufficient at this
* point to just return False, but Xinerama is broken at
* this point and only advertises depths which have an
* associated visual. Of course, the other depths still
* work, but the only way to find out is to try them.
*/
dc.dpy = dpy;
dc.missing = 0;
dc.serial = XNextRequest (dpy);
_XLockMutex(_Xglobal_lock);
dc.next = depthChecks;
depthChecks = &dc;
_XUnlockMutex (_Xglobal_lock);
/*
* I suspect this is not really thread safe, but Xlib doesn't
* provide a lot of options here
*/
previousHandler = XSetErrorHandler (XRenderDepthCheckErrorHandler);
/*
* Try each missing depth and see if pixmap creation succeeds
*/
for (d = 1; d <= 32; d++)
/* don't check depth 1 == Xcursor recurses... */
if ((missing & DEPTH_MASK(d)) && d != 1)
{
Pixmap p;
p = XCreatePixmap (dpy, RootWindow (dpy, s), 1, 1, d);
XFreePixmap (dpy, p);
}
XSync (dpy, False);
XSetErrorHandler (previousHandler);
/*
* Unhook from the list of depth check records
*/
_XLockMutex(_Xglobal_lock);
for (dp = &depthChecks; *dp; dp = &(*dp)->next)
{
if (*dp == &dc)
{
*dp = dc.next;
break;
}
}
_XUnlockMutex (_Xglobal_lock);
if (dc.missing)
return False;
}
}
return True;
}
