LibGfx: Allow changing the default font path

Userland/Libraries/LibGfx/FontDatabase.cpp

@@ -25,6 +25,7 @@ static RefPtr<Font> s_default_font;
 static String s_default_font_query;
 static RefPtr<Font> s_fixed_width_font;
 static String s_fixed_width_font_query;
+static String s_default_fonts_lookup_path = "/res/fonts";
 
 void FontDatabase::set_default_font_query(String query)
 {
@@ -39,6 +40,18 @@ String FontDatabase::default_font_query()
     return s_default_font_query;
 }
 
+void FontDatabase::set_default_fonts_lookup_path(String path)
+{
+    if (s_default_fonts_lookup_path == path)
+        return;
+    s_default_fonts_lookup_path = move(path);
+}
+
+String FontDatabase::default_fonts_lookup_path()
+{
+    return s_default_fonts_lookup_path;
+}
+
 Font& FontDatabase::default_font()
 {
     if (!s_default_font) {
@@ -80,7 +93,7 @@ struct FontDatabase::Private {
 FontDatabase::FontDatabase()
     : m_private(make<Private>())
 {
-    Core::DirIterator dir_iterator("/res/fonts", Core::DirIterator::SkipDots);
+    Core::DirIterator dir_iterator(s_default_fonts_lookup_path, Core::DirIterator::SkipDots);
     if (dir_iterator.has_error()) {
         warnln("DirIterator: {}", dir_iterator.error_string());
         exit(1);

Userland/Libraries/LibGfx/FontDatabase.h

@@ -39,8 +39,10 @@ public:
 
     static String default_font_query();
     static String fixed_width_font_query();
+    static String default_fonts_lookup_path();
     static void set_default_font_query(String);
     static void set_fixed_width_font_query(String);
+    static void set_default_fonts_lookup_path(String);
 
     RefPtr<Gfx::Font> get(const String& family, unsigned size, unsigned weight, unsigned slope);
     RefPtr<Gfx::Font> get(const String& family, const String& variant, unsigned size);