Validate fonts used in Xft tests

This compares the font family from the loaded font with the requested
family and skips tests where the requested family wasn't available.

It's not perfect, as someone could have a mis-configured font family,
but should catch most incorrect font usages.

I've also switched from Charter to DejaVu Sans as that is more widely
installed.

Signed-off-by: Keith Packard <keithp@keithp.com>
Part-of: <https://gitlab.freedesktop.org/xorg/test/x11perf/-/merge_requests/1>

1 files changed, 18 insertions, 0 deletions

diff --git a/do_text.c b/do_text.c
index 8d28def..355ba8d 100644
--- a/do_text.c
+++ b/do_text.c
@@ -409,6 +409,8 @@ InitAAText(XParms xp, Parms p, int64_t reps)
 {
     char		ch;
     XRenderColor	color;
+    FcValue             value;
+    int                 v_len;
 
     aafont = XftFontOpenName (xp->d, DefaultScreen (xp->d), p->font);
 
@@ -418,6 +420,22 @@ InitAAText(XParms xp, Parms p, int64_t reps)
 	       p->font);
 	return 0;
     }
+    if (FcPatternGet(aafont->pattern, FC_FAMILY, 0, &value) != FcResultMatch ||
+        value.type != FcTypeString)
+    {
+	printf("Could not load font '%s', benchmark omitted\n",
+	       p->font);
+	XftFontClose (xp->d, aafont);
+	return 0;
+    }
+    v_len = strlen((char *) value.u.s);
+    if (strncmp((char *) value.u.s, p->font, v_len) != 0 || p->font[v_len] != ':') {
+	printf("Could not load font '%s' (found %s), benchmark omitted\n",
+	       p->font,
+               (char *) value.u.s);
+	XftFontClose (xp->d, aafont);
+	return 0;
+    }
 
     aadraw = XftDrawCreate (xp->d, xp->w,
 			    xp->vinfo.visual,