LibTTF: Add option to load font from a byte buffer

Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/ad243ef3aab
Pull-request: https://github.com/SerenityOS/serenity/pull/4721
Reviewed-by: https://github.com/awesomekling

Libraries/LibTTF/Font.cpp

@@ -208,6 +208,11 @@ RefPtr<Font> Font::load_from_file(const StringView& path, unsigned index)
         return nullptr;
     }
     auto buffer = file->read_all();
+    return load_from_memory(buffer, index);
+}
+
+RefPtr<Font> Font::load_from_memory(ByteBuffer& buffer, unsigned index)
+{
     if (buffer.size() < 4) {
         dbg() << "Font file too small";
         return nullptr;
@@ -227,7 +232,7 @@ RefPtr<Font> Font::load_from_file(const StringView& path, unsigned index)
         return nullptr;
     }
     if (tag != 0x00010000) {
-        dbg() << "Not a valid  font";
+        dbg() << "Not a valid font";
         return nullptr;
     }
     return load_from_offset(move(buffer), 0);

Libraries/LibTTF/Font.h

@@ -65,6 +65,7 @@ class Font : public RefCounted<Font> {
 
 public:
     static RefPtr<Font> load_from_file(const StringView& path, unsigned index = 0);
+    static RefPtr<Font> load_from_memory(ByteBuffer&, unsigned index = 0);
 
     ScaledFontMetrics metrics(float x_scale, float y_scale) const;
     ScaledGlyphMetrics glyph_metrics(u32 glyph_id, float x_scale, float y_scale) const;