tests: Skip trapezoids for unsupported XRender formats

xserver commit 436fd7e8b4966c305ea9c43f3c14c2ca04c35539 removed support
for PictStandardA4. x11perf assumes this format always exists, so trying
to run the -aa4trap* tests causes a segmentation fault when
`XRenderFindStandardFormat (xp->d, PictStandardA4)` returns NULL.

Since the server change was intentional, skip the tests if
XRenderFindStandardFormat() returns NULL.

See also: https://gitlab.freedesktop.org/xorg/xserver/-/commit/436fd7e8b4966c305ea9c43f3c14c2ca04c35539

1 files changed, 2 insertions, 0 deletions

diff --git a/do_traps.c b/do_traps.c
index 0fd7056..0f5d168 100644
--- a/do_traps.c
+++ b/do_traps.c
@@ -165,6 +165,8 @@ InitFixedTraps(XParms xp, Parms p, int64_t reps)
 	break;
     }
     maskFormat = XRenderFindStandardFormat (xp->d, std_fmt);
+    if (!maskFormat)
+	return 0;
     
     maskPixmap = XCreatePixmap (xp->d, xp->w, WIDTH, HEIGHT, depth);