feat(文件合并): 合并字体适配文件

ofdgo_font_match.go

@@ -15,6 +15,7 @@
 package ofdgo
 
 import (
+	"bytes"
 	"path"
 	"slices"
 	"strings"
@@ -389,3 +390,46 @@ func appendFontPattern(patterns []string, seen map[string]bool, pattern string)
 	seen[key] = true
 	return append(patterns, pattern)
 }
+
+// appendFontFileNames 建立各字体的内部名称与文件别名匹配候选
+// 入参: candidates 字体候选, index 文件候选索引, faces 各字体内部名称
+// 返回: []fontFileCandidate 字体候选列表
+func appendFontFileNames(candidates []fontFileCandidate, index int, faces [][]string) []fontFileCandidate {
+	file := candidates[index]
+	replaced := false
+	for face, names := range faces {
+		file.face = face
+		file.names = make([]string, len(names))
+		for i, name := range names {
+			file.names[i] = basefont.NormalizeName(name)
+		}
+		for _, name := range file.names {
+			file.normalized = name
+			if !replaced {
+				candidates[index] = file
+				replaced = true
+			} else {
+				candidates = append(candidates, file)
+			}
+		}
+	}
+	return candidates
+}
+
+// fontCollectionIndex 按内部名称与样式选择集合项，未匹配时保留首项
+// 入参: data 集合数据, names 字体名称, bold 是否粗体, italic 是否斜体
+// 返回: int 零起始字体索引
+func fontCollectionIndex(data []byte, names []string, bold, italic bool) int {
+	return fontNameIndex(basefont.FileNames(bytes.NewReader(data)), names, bold, italic)
+}
+
+// fontNameIndex 按名称与样式选择字体索引，未匹配时保留首项
+// 入参: faces 各字体名称, names 目标名称, bold 是否粗体, italic 是否斜体
+// 返回: int 零起始字体索引
+func fontNameIndex(faces [][]string, names []string, bold, italic bool) int {
+	candidates := appendFontFileNames([]fontFileCandidate{{}}, 0, faces)
+	if matches := fontFileMatches(candidates, names, bold, italic); len(matches) > 0 {
+		return matches[0].face
+	}
+	return 0
+}