refactor(font): 重构字体加载模块

- 将 Source 结构体重命名为 Font，更好地反映其功能
- 更新了相关函数和变量的命名，以适应新的结构体名称
- 移动了字体加载相关的代码，使其更加集中和易于管理

Author: kuafuRace

font/default.go

@@ -6,6 +6,6 @@ import "embed"
 //
 //go:embed sources/*.ttf
 //go:embed sources/*.ttc
-var defaultSource embed.FS
+var defaultFont embed.FS
 
-var DefaultSource = NewSource(defaultSource)
+var DefaultFont = NewFont(defaultFont)

font/loader.go renamed to font/font.go

@@ -10,18 +10,18 @@ import (
 
 const FontPath = "sources"
 
-type Source struct {
+type Font struct {
 	fs embed.FS
 }
 
-func NewSource(fs embed.FS) *Source {
-	return &Source{fs: fs}
+func NewFont(fs embed.FS) *Font {
+	return &Font{fs: fs}
 }
 
 // LoadFont load font from file.
-func (s *Source) LoadFont(name string) *truetype.Font {
+func (f *Font) LoadFont(name string) *truetype.Font {
 	fontPath := strings.Trim(FontPath, "/")
-	fontBytes, err := s.fs.ReadFile(fontPath + "/" + name)
+	fontBytes, err := f.fs.ReadFile(fontPath + "/" + name)
 	if err != nil {
 		panic(err.Error())
 	}
@@ -35,21 +35,20 @@ func (s *Source) LoadFont(name string) *truetype.Font {
 
 // LoadFonts load fonts from dir.
 // make the simple-font(RitaSmith.ttf) the first font of trueTypeFonts.
-func (s *Source) LoadFonts(names []string) []*truetype.Font {
+func (f *Font) LoadFonts(names []string) []*truetype.Font {
 	if len(names) == 0 {
 		return nil
 	}
 	fonts := make([]*truetype.Font, 0)
 	for _, name := range names {
-		f := s.LoadFont(name)
-		fonts = append(fonts, f)
+		fonts = append(fonts, f.LoadFont(name))
 	}
 	return fonts
 }
 
 // LoadAll load all fonts.
-func (s *Source) LoadAll() []*truetype.Font {
-	return s.LoadFonts([]string{
+func (f *Font) LoadAll() []*truetype.Font {
+	return f.LoadFonts([]string{
 		"3Dumb.ttf",
 		"ApothecaryFont.ttf",
 		"Comismsh.ttf",
@@ -64,6 +63,6 @@ func (s *Source) LoadAll() []*truetype.Font {
 }
 
 // LoadChinese load Chinese font.
-func (s *Source) LoadChinese() *truetype.Font {
-	return s.LoadFont("wqy-microhei.ttc")
+func (f *Font) LoadChinese() *truetype.Font {
+	return f.LoadFont("wqy-microhei.ttc")
 }