diff --git a/font.go b/font.go
index cdc1c18..279706c 100644
--- a/font.go
+++ b/font.go
@@ -13,8 +13,9 @@ import (
 )
 
 var (
-	fontFolder = "../resource/font/"
-	fonts      = make(map[string]*truetype.Font)
+	fontFolder               = "../resource/font/"
+	fonts                    = make(map[string]*truetype.Font)
+	fontNamer  FontFileNamer = FontFileName
 )
 
 type FontStyle byte
@@ -39,6 +40,8 @@ type FontData struct {
 	Style  FontStyle
 }
 
+type FontFileNamer func(fontData FontData) string
+
 func FontFileName(fontData FontData) string {
 	fontFileName := fontData.Name
 	switch fontData.Family {
@@ -63,11 +66,11 @@ func FontFileName(fontData FontData) string {
 }
 
 func RegisterFont(fontData FontData, font *truetype.Font) {
-	fonts[FontFileName(fontData)] = font
+	fonts[fontNamer(fontData)] = font
 }
 
 func GetFont(fontData FontData) *truetype.Font {
-	fontFileName := FontFileName(fontData)
+	fontFileName := fontNamer(fontData)
 	font := fonts[fontFileName]
 	if font != nil {
 		return font
@@ -84,6 +87,10 @@ func SetFontFolder(folder string) {
 	fontFolder = filepath.Clean(folder)
 }
 
+func SetFontNamer(fn FontFileNamer) {
+	fontNamer = fn
+}
+
 func loadFont(fontFileName string) *truetype.Font {
 	fontBytes, err := ioutil.ReadFile(path.Join(fontFolder, fontFileName))
 	if err != nil {