Add forbidden font families

examples/text/src/font/fallback/macos.rs

@@ -8,6 +8,11 @@ pub fn common_fallback() -> &'static [&'static str] {
     ]
 }
 
+// Fallbacks to never use
+pub fn forbidden_fallback() -> &'static [&'static str] {
+    &[]
+}
+
 // Fallbacks to use per script
 pub fn script_fallback(script: &Script, locale: &str) -> &'static [&'static str] {
     //TODO: abstract style (sans/serif/monospaced)

examples/text/src/font/fallback/mod.rs

@@ -123,10 +123,13 @@ impl<'a> Iterator for FontFallbackIter<'a> {
 
         //TODO: do we need to do this?
         //TODO: do not evaluate fonts more than once!
+        let forbidden_families = forbidden_fallback();
         while self.other_i < self.fonts.len() {
             let font = &self.fonts[self.other_i];
             self.other_i += 1;
-            return Some(font);
+            if ! forbidden_families.contains(&font.info.family.as_str()) {
+                return Some(font);
+            }
         }
 
         self.end = true;

examples/text/src/font/fallback/other.rs

@@ -5,6 +5,11 @@ pub fn common_fallback() -> &'static [&'static str] {
     &[]
 }
 
+// Fallbacks to never use
+pub fn forbidden_fallback() -> &'static [&'static str] {
+    &[]
+}
+
 // Fallbacks to use per script
 pub fn script_fallback(script: &Script, locale: &str) -> &'static [&'static str] {
     &[]

examples/text/src/font/fallback/unix.rs

@@ -13,6 +13,11 @@ pub fn common_fallback() -> &'static [&'static str] {
     ]
 }
 
+// Fallbacks to never use
+pub fn forbidden_fallback() -> &'static [&'static str] {
+    &[]
+}
+
 fn han_unification(locale: &str) -> &'static [&'static str] {
     match locale {
         // Japan

examples/text/src/font/fallback/windows.rs

@@ -12,6 +12,11 @@ pub fn common_fallback() -> &'static [&'static str] {
     ]
 }
 
+// Fallbacks to never use
+pub fn forbidden_fallback() -> &'static [&'static str] {
+    &[]
+}
+
 fn han_unification(locale: &str) -> &'static [&'static str] {
     //TODO!
     match locale {