Add a hash function for families

Add a hash function that behaves like family
comparison: ignoring case and blanks. This
will be used to replace the list walking for
finding family matches with a hash table.

src/fcint.h

@@ -1328,6 +1328,9 @@ FcStrLastSlash (const FcChar8  *path);
 FcPrivate FcChar32
 FcStrHashIgnoreCase (const FcChar8 *s);
 
+FcPrivate FcChar32
+FcStrHashIgnoreBlanksAndCase (const FcChar8 *s);
+
 FcPrivate FcChar8 *
 FcStrCanonFilename (const FcChar8 *s);
 

src/fcstr.c

@@ -320,6 +320,19 @@ FcStrHashIgnoreCase (const FcChar8 *s)
     return h;
 }
 
+FcChar32
+FcStrHashIgnoreBlanksAndCase (const FcChar8 *s)
+{
+    FcChar32	    h = 0;
+    FcCaseWalker    w;
+    FcChar8	    c;
+
+    FcStrCaseWalkerInit (s, &w);
+    while ((c = FcStrCaseWalkerNextNonBlank (&w)))
+	h = ((h << 3) ^ (h >> 3)) ^ c;
+    return h;
+}
+
 /*
  * Is the head of s1 equal to s2?
  */