LibGfx: Return family names by reference to avoid unnecessairy cloning

Libraries/LibGfx/Font/Font.h

@@ -85,7 +85,7 @@ public:
     virtual float width(StringView) const = 0;
     virtual float width(Utf8View const&) const = 0;
 
-    virtual FlyString family() const = 0;
+    virtual FlyString const& family() const = 0;
 
     virtual NonnullRefPtr<Font> with_size(float point_size) const = 0;
 

Libraries/LibGfx/Font/ScaledFont.h

@@ -37,7 +37,7 @@ public:
     virtual u8 baseline() const override { return m_point_height; }  // FIXME: Read from font
     virtual float width(StringView) const override;
     virtual float width(Utf8View const&) const override;
-    virtual FlyString family() const override { return m_typeface->family(); }
+    virtual FlyString const& family() const override { return m_typeface->family(); }
 
     virtual NonnullRefPtr<ScaledFont> scaled_with_size(float point_size) const;
     virtual NonnullRefPtr<Font> with_size(float point_size) const override;

Libraries/LibGfx/Font/Typeface.h

@@ -47,7 +47,7 @@ public:
     virtual u32 glyph_count() const = 0;
     virtual u16 units_per_em() const = 0;
     virtual u32 glyph_id_for_code_point(u32 code_point) const = 0;
-    virtual FlyString family() const = 0;
+    virtual FlyString const& family() const = 0;
     virtual u16 weight() const = 0;
     virtual u16 width() const = 0;
     virtual u8 slope() const = 0;

Libraries/LibGfx/Font/TypefaceSkia.cpp

@@ -114,7 +114,7 @@ void TypefaceSkia::populate_glyph_page(GlyphPage& glyph_page, size_t page_index)
     }
 }
 
-FlyString TypefaceSkia::family() const
+FlyString const& TypefaceSkia::family() const
 {
     if (!m_family.has_value()) {
         SkString family_name;

Libraries/LibGfx/Font/TypefaceSkia.h

@@ -19,7 +19,7 @@ public:
     virtual u32 glyph_count() const override;
     virtual u16 units_per_em() const override;
     virtual u32 glyph_id_for_code_point(u32 code_point) const override;
-    virtual FlyString family() const override;
+    virtual FlyString const& family() const override;
     virtual u16 weight() const override;
     virtual u16 width() const override;
     virtual u8 slope() const override;

Libraries/LibWeb/CSS/ParsedFontFace.h

@@ -30,7 +30,7 @@ public:
     Optional<Percentage> ascent_override() const { return m_ascent_override; }
     Optional<Percentage> descent_override() const { return m_descent_override; }
     FontDisplay font_display() const { return m_font_display; }
-    FlyString font_family() const { return m_font_family; }
+    FlyString const& font_family() const { return m_font_family; }
     Optional<OrderedHashMap<FlyString, i64>> font_feature_settings() const { return m_font_feature_settings; }
     Optional<FlyString> font_language_override() const { return m_font_language_override; }
     Optional<FlyString> font_named_instance() const { return m_font_named_instance; }