diff --git a/ofdgo_font_fs.go b/ofdgo_font_fs.go
index 865601d..c4f85f2 100644
--- a/ofdgo_font_fs.go
+++ b/ofdgo_font_fs.go
@@ -112,8 +112,8 @@ func (fsys *FontFS) Glob(pattern string) ([]string, error) {
 // 入参: names 字体名称列表
 // 返回: string 匹配字体文件, bool 是否为名称匹配
 func (fsys *FontFS) Match(names ...string) (string, bool) {
-	for _, name := range fontCandidateNames(names...) {
-		if matches := fsys.match(name + "*"); len(matches) > 0 {
+	for _, pattern := range fontFilePatterns(names...) {
+		if matches := fsys.match(pattern); len(matches) > 0 {
 			return matches[0], true
 		}
 	}
@@ -127,12 +127,16 @@ func (fsys *FontFS) Match(names ...string) (string, bool) {
 // 入参: pattern 匹配模式
 // 返回: []string 字体文件列表
 func (fsys *FontFS) match(pattern string) []string {
-	var matches []string
+	buckets := make([][]string, fontMatchFuzzy+1)
 	for _, name := range fsys.names {
-		if matchFontPattern(pattern, name) {
-			matches = append(matches, name)
+		if rank := matchFontPatternRank(pattern, name); rank != fontMatchNone {
+			buckets[rank] = append(buckets[rank], name)
 		}
 	}
+	var matches []string
+	for rank := fontMatchExact; rank <= fontMatchFuzzy; rank++ {
+		matches = append(matches, buckets[rank]...)
+	}
 	return matches
 }
 
@@ -140,8 +144,8 @@ func (fsys *FontFS) match(pattern string) []string {
 // 返回: []string 字体文件列表
 func (fsys *FontFS) fallbackFonts() []string {
 	for _, item := range fontFallbackFiles {
-		if _, ok := fsys.files[item]; ok {
-			return []string{item}
+		if matches := fsys.match(item); len(matches) > 0 {
+			return []string{matches[0]}
 		}
 	}
 	if len(fsys.names) > 0 {
@@ -179,33 +183,49 @@ func cleanFontName(name string) string {
 	return strings.ToLower(name)
 }
 
-// matchFontPattern 匹配字体文件模式
+// matchFontPatternRank 获取字体文件匹配等级
 // 入参: pattern 匹配模式, name 字体文件名
-// 返回: bool 是否匹配
-func matchFontPattern(pattern, name string) bool {
-	if ok, _ := path.Match(pattern, name); ok {
-		return true
-	}
-	if ok, _ := path.Match(strings.ToLower(pattern), strings.ToLower(name)); ok {
-		return true
-	}
-	stem := strings.TrimSuffix(pattern, "*")
-	stem = strings.TrimSuffix(stem, path.Ext(stem))
-	stem = fontNormalizeName(stem)
+// 返回: int 匹配等级
+func matchFontPatternRank(pattern, name string) int {
+	exactPath, _ := path.Match(pattern, name)
+	lowerPath, _ := path.Match(strings.ToLower(pattern), strings.ToLower(name))
+	stem := fontPatternStem(pattern)
 	if stem == "" {
-		return false
+		if exactPath || lowerPath {
+			return fontMatchFuzzy
+		}
+		return fontMatchNone
 	}
 	name = fontNormalizeName(name)
-	if strings.HasPrefix(name, stem) {
-		return true
+	if name == stem {
+		return fontMatchExact
 	}
-	for _, alias := range fontCandidateNames(stem) {
+	aliases := fontExactCandidateNames(stem)
+	for _, alias := range aliases {
 		alias = fontNormalizeName(alias)
-		if alias != "" && strings.HasPrefix(name, alias) {
-			return true
+		if alias != "" && name == alias {
+			return fontMatchExact
 		}
 	}
-	return false
+	if strings.HasPrefix(name, stem) {
+		return fontMatchPartial
+	}
+	for _, alias := range aliases {
+		alias = fontNormalizeName(alias)
+		if alias != "" && strings.HasPrefix(name, alias) {
+			return fontMatchPartial
+		}
+	}
+	if exactPath || lowerPath || strings.Contains(name, stem) {
+		return fontMatchFuzzy
+	}
+	for _, alias := range aliases {
+		alias = fontNormalizeName(alias)
+		if alias != "" && strings.Contains(name, alias) {
+			return fontMatchFuzzy
+		}
+	}
+	return fontMatchNone
 }
 
 // fontMemFile 内存字体文件
diff --git a/ofdgo_font_info.go b/ofdgo_font_info.go
index fb34f3c..2398917 100644
--- a/ofdgo_font_info.go
+++ b/ofdgo_font_info.go
@@ -157,6 +157,13 @@ func (r *Renderer) fontInfo(font Font) FontInfo {
 // 入参: names 字体名称列表
 // 返回: string 匹配字体文件, bool 是否为名称匹配
 func (r *Renderer) matchFont(names ...string) (string, bool) {
+	for _, dir := range r.fontDirs {
+		for _, pattern := range fontFilePatterns(names...) {
+			if matches := r.globFontFiles(dir, pattern); len(matches) > 0 {
+				return matches[0], true
+			}
+		}
+	}
 	for _, fsys := range r.fontFS {
 		if matcher, ok := fsys.(interface {
 			Match(...string) (string, bool)
@@ -170,9 +177,11 @@ func (r *Renderer) matchFont(names ...string) (string, bool) {
 			return matched, true
 		}
 	}
-	for _, fsys := range r.fontFS {
-		if matched := fallbackFontFS(fsys); matched != "" {
-			return matched, false
+	if !canLoadSystemFonts() {
+		for _, fsys := range r.fontFS {
+			if matched := fallbackFontFS(fsys); matched != "" {
+				return matched, false
+			}
 		}
 	}
 	return "", false
@@ -183,8 +192,7 @@ func (r *Renderer) matchFont(names ...string) (string, bool) {
 // 返回: string 匹配字体文件
 func matchFontFS(fsys fs.FS, names ...string) string {
 	for _, pattern := range fontFilePatterns(names...) {
-		matches, err := fs.Glob(fsys, pattern)
-		if err == nil && len(matches) > 0 {
+		if matches := fontFSMatches(fsys, pattern); len(matches) > 0 {
 			return matches[0]
 		}
 	}
@@ -195,13 +203,51 @@ func matchFontFS(fsys fs.FS, names ...string) string {
 // 入参: fsys 字体文件系统
 // 返回: string 回退字体文件
 func fallbackFontFS(fsys fs.FS) string {
-	matches, err := fs.Glob(fsys, "*")
-	if err == nil && len(matches) > 0 {
-		return matches[0]
+	for _, pattern := range fontFallbackFiles {
+		if matches := fontFSMatches(fsys, pattern); len(matches) > 0 {
+			return matches[0]
+		}
+	}
+	all, _ := fs.Glob(fsys, "*")
+	for _, name := range all {
+		if isFontFileName(name) {
+			return name
+		}
 	}
 	return ""
 }
 
+// fontFSMatches 匹配字体文件系统中的字体文件
+// 入参: fsys 字体文件系统, pattern 匹配模式
+// 返回: []string 字体文件列表
+func fontFSMatches(fsys fs.FS, pattern string) []string {
+	seen := make(map[string]bool)
+	buckets := make([][]string, fontMatchFuzzy+1)
+	add := func(name string, rank int) {
+		if !isFontFileName(name) {
+			return
+		}
+		if rank == fontMatchNone || seen[name] {
+			return
+		}
+		seen[name] = true
+		buckets[rank] = append(buckets[rank], name)
+	}
+	matches, _ := fs.Glob(fsys, pattern)
+	for _, name := range matches {
+		add(name, matchFontPatternRank(pattern, path.Base(name)))
+	}
+	all, _ := fs.Glob(fsys, "*")
+	for _, name := range all {
+		add(name, matchFontPatternRank(pattern, path.Base(name)))
+	}
+	var result []string
+	for rank := fontMatchExact; rank <= fontMatchFuzzy; rank++ {
+		result = append(result, buckets[rank]...)
+	}
+	return result
+}
+
 // fontUsage 统计文档字体使用次数
 // 入参: doc 文档结构
 // 返回: map[string]int 字体使用次数
diff --git a/ofdgo_font_match.go b/ofdgo_font_match.go
index 3147d41..a37c6a7 100644
--- a/ofdgo_font_match.go
+++ b/ofdgo_font_match.go
@@ -27,36 +27,43 @@ type fontMatchRule struct {
 	NoSyntheticBold bool
 }
 
+const (
+	fontMatchNone = iota
+	fontMatchExact
+	fontMatchPartial
+	fontMatchFuzzy
+)
+
 var fontMatchRules = []fontMatchRule{
 	{
 		Keys:            []string{"小标宋", "方正小标宋", "xiaobiaosong", "fzxiaobiaosong", "fzxbs"},
 		Names:           []string{"小标宋体", "方正小标宋简体", "FZXiaoBiaoSong-B05", "FZXiaoBiaoSong-B05S"},
-		Files:           []string{"FZXBSJW.TTF", "fzxbs*.ttf", "xiaobiaosong*.ttf"},
+		Files:           []string{"FZXBSJW.TTF", "fzxbs*.ttf", "fzxiaobiaosong*.ttf", "xiaobiaosong*.ttf"},
 		System:          "FZXiaoBiaoSong-B05S",
 		NoSyntheticBold: true,
 	},
 	{
-		Keys:   []string{"宋体", "新宋体", "simsun", "nsimsun", "songti", "书宋", "方正书宋"},
-		Names:  []string{"宋体", "新宋体", "SimSun", "NSimSun", "SongTi"},
-		Files:  []string{"simsun.ttc", "simsun.ttf", "nsimsun.ttf"},
+		Keys:   []string{"宋体", "新宋体", "simsun", "nsimsun", "simsunextb", "song", "songti", "stsong", "书宋", "方正书宋"},
+		Names:  []string{"宋体", "新宋体", "SimSun", "NSimSun", "SongTi", "STSong"},
+		Files:  []string{"simsun.ttc", "simsun.ttf", "nsimsun.ttf", "STSONG.TTF"},
 		System: "SimSun",
 	},
 	{
-		Keys:   []string{"黑体", "simhei", "heiti"},
-		Names:  []string{"黑体", "SimHei", "HeiTi"},
-		Files:  []string{"simhei.ttf"},
+		Keys:   []string{"黑体", "hei", "simhei", "heiti", "sthei", "方正黑体"},
+		Names:  []string{"黑体", "SimHei", "HeiTi", "STHeiti", "方正黑体简体"},
+		Files:  []string{"simhei.ttf", "STXIHEI.TTF", "FZHT_GB18030.TTF", "fzht*.ttf"},
 		System: "SimHei",
 	},
 	{
-		Keys:   []string{"楷体", "kaiti", "simkai"},
-		Names:  []string{"楷体", "KaiTi", "SimKai"},
-		Files:  []string{"simkai.ttf", "kaiti.ttf"},
+		Keys:   []string{"楷体", "kai", "kaiti", "simkai", "stkaiti", "方正楷体"},
+		Names:  []string{"楷体", "KaiTi", "SimKai", "STKaiti", "方正楷体简体"},
+		Files:  []string{"simkai.ttf", "kaiti.ttf", "STKAITI.TTF", "FZKTJ.TTF", "fzkai*.ttf", "fzkt*.ttf"},
 		System: "KaiTi",
 	},
 	{
-		Keys:   []string{"仿宋", "fangsong", "simfang"},
-		Names:  []string{"仿宋", "FangSong", "SimFang"},
-		Files:  []string{"simfang.ttf", "fangsong.ttf"},
+		Keys:   []string{"仿宋", "fang", "fangsong", "simfang", "stfangsong", "方正仿宋"},
+		Names:  []string{"仿宋", "FangSong", "SimFang", "STFangsong", "方正仿宋简体"},
+		Files:  []string{"simfang.ttf", "fangsong.ttf", "STFANGSO.TTF", "FZFSJ.TTF", "fzfs*.ttf"},
 		System: "FangSong",
 	},
 	{
@@ -103,7 +110,40 @@ var fontMatchRules = []fontMatchRule{
 	},
 }
 
-var fontFallbackFiles = []string{"simsun.ttc", "msyh.ttc", "simhei.ttf"}
+var fontFallbackFiles = []string{
+	"simsun.ttc", "simsun.ttf", "nsimsun.ttf",
+	"msyh.ttc", "msyh.ttf", "simhei.ttf",
+	"NotoSansCJK*.ttc", "NotoSansSC*.otf", "SourceHanSansSC*.otf",
+	"arial.ttf",
+}
+
+// FontNormalizeName 规范化字体名称
+// 入参: name 字体名称
+// 返回: string 规范化后的字体名称
+func FontNormalizeName(name string) string {
+	return fontNormalizeName(name)
+}
+
+// FontCandidateNames 获取字体候选名称
+// 入参: names 字体名称列表
+// 返回: []string 字体候选名称列表
+func FontCandidateNames(names ...string) []string {
+	return fontCandidateNames(names...)
+}
+
+// FontFilePatterns 获取字体文件匹配模式
+// 入参: names 字体名称列表
+// 返回: []string 字体文件匹配模式
+func FontFilePatterns(names ...string) []string {
+	return fontFilePatterns(names...)
+}
+
+// FontSystemNames 获取系统字体名称
+// 入参: names 字体名称列表
+// 返回: []string 系统字体名称
+func FontSystemNames(names ...string) []string {
+	return fontSystemNames(names...)
+}
 
 // fontNormalizeName 规范化字体名称
 // 入参: name 字体名称
@@ -119,19 +159,39 @@ func fontNormalizeName(name string) string {
 // 入参: names 字体名称列表
 // 返回: []string 字体候选名称
 func fontCandidateNames(names ...string) []string {
+	return fontCandidateNamesByLevel(fontMatchFuzzy, names...)
+}
+
+// fontExactCandidateNames 获取精确字体候选名称
+// 入参: names 字体名称列表
+// 返回: []string 精确字体候选名称
+func fontExactCandidateNames(names ...string) []string {
+	return fontCandidateNamesByLevel(fontMatchExact, names...)
+}
+
+// fontCandidateNamesByLevel 获取指定等级内的字体候选名称
+// 入参: maxLevel 最大匹配等级, names 字体名称列表
+// 返回: []string 字体候选名称
+func fontCandidateNamesByLevel(maxLevel int, names ...string) []string {
 	var result []string
 	seen := make(map[string]bool)
+	var bases []string
 	for _, name := range names {
 		name = strings.TrimSpace(name)
 		if name == "" {
 			continue
 		}
 		result = appendFontName(result, seen, name)
-		for _, rule := range fontMatchRules {
-			if fontRuleMatch(rule, name) {
-				result = appendFontName(result, seen, rule.System)
-				for _, item := range rule.Names {
-					result = appendFontName(result, seen, item)
+		bases = append(bases, name)
+	}
+	for level := fontMatchExact; level <= maxLevel; level++ {
+		for _, name := range bases {
+			for _, rule := range fontMatchRules {
+				if fontRuleMatchLevel(rule, name) == level {
+					result = appendFontName(result, seen, rule.System)
+					for _, item := range rule.Names {
+						result = appendFontName(result, seen, item)
+					}
 				}
 			}
 		}
@@ -139,20 +199,34 @@ func fontCandidateNames(names ...string) []string {
 	return result
 }
 
+// fontPatternStem 获取字体匹配模式主干
+// 入参: pattern 字体文件匹配模式
+// 返回: string 字体匹配模式主干
+func fontPatternStem(pattern string) string {
+	stem := strings.TrimSuffix(pattern, "*")
+	stem = strings.TrimSuffix(stem, path.Ext(stem))
+	if index := strings.IndexAny(stem, "*?["); index >= 0 {
+		stem = stem[:index]
+	}
+	return fontNormalizeName(stem)
+}
+
 // fontFilePatterns 获取字体文件匹配模式
 // 入参: names 字体名称列表
 // 返回: []string 字体文件匹配模式
 func fontFilePatterns(names ...string) []string {
 	var result []string
 	seen := make(map[string]bool)
-	for _, name := range fontCandidateNames(names...) {
-		result = appendFontPattern(result, seen, name+"*")
-	}
-	for _, name := range names {
-		for _, rule := range fontMatchRules {
-			if fontRuleMatch(rule, name) {
-				for _, item := range rule.Files {
-					result = appendFontPattern(result, seen, item)
+	for level := fontMatchExact; level <= fontMatchFuzzy; level++ {
+		for _, name := range fontCandidateNamesAtLevel(level, names...) {
+			result = appendFontPattern(result, seen, name+"*")
+		}
+		for _, name := range names {
+			for _, rule := range fontMatchRules {
+				if fontRuleMatchLevel(rule, name) == level {
+					for _, item := range rule.Files {
+						result = appendFontPattern(result, seen, item)
+					}
 				}
 			}
 		}
@@ -167,19 +241,45 @@ func fontSystemNames(names ...string) []string {
 	var result []string
 	seen := make(map[string]bool)
 	for _, name := range names {
-		for _, item := range fontCandidateNames(name) {
+		for _, item := range fontCandidateNamesByLevel(fontMatchPartial, name) {
 			result = appendFontName(result, seen, item)
 		}
 	}
 	return result
 }
 
+// fontCandidateNamesAtLevel 获取指定等级的字体候选名称
+// 入参: level 匹配等级, names 字体名称列表
+// 返回: []string 字体候选名称
+func fontCandidateNamesAtLevel(level int, names ...string) []string {
+	var result []string
+	seen := make(map[string]bool)
+	for _, name := range names {
+		name = strings.TrimSpace(name)
+		if name == "" {
+			continue
+		}
+		if level == fontMatchExact {
+			result = appendFontName(result, seen, name)
+		}
+		for _, rule := range fontMatchRules {
+			if fontRuleMatchLevel(rule, name) == level {
+				result = appendFontName(result, seen, rule.System)
+				for _, item := range rule.Names {
+					result = appendFontName(result, seen, item)
+				}
+			}
+		}
+	}
+	return result
+}
+
 // fontDefaultSystemNames 获取默认系统字体名称
 // 返回: []string 默认系统字体名称
 func fontDefaultSystemNames() []string {
 	return []string{
-		"SimHei", "Microsoft YaHei", "SimSun", "KaiTi", "FangSong",
-		"Arial", "Segoe UI", "Times New Roman",
+		"SimSun", "Microsoft YaHei", "SimHei", "KaiTi", "FangSong",
+		"Noto Sans CJK SC", "Source Han Sans SC", "Arial", "Segoe UI", "Times New Roman",
 	}
 }
 
@@ -189,7 +289,8 @@ func fontDefaultSystemNames() []string {
 func fontNoSyntheticBold(names ...string) bool {
 	for _, name := range names {
 		for _, rule := range fontMatchRules {
-			if rule.NoSyntheticBold && fontRuleMatch(rule, name) {
+			level := fontRuleMatchLevel(rule, name)
+			if rule.NoSyntheticBold && level >= fontMatchExact && level <= fontMatchPartial {
 				return true
 			}
 		}
@@ -197,21 +298,66 @@ func fontNoSyntheticBold(names ...string) bool {
 	return false
 }
 
+// isFontFileName 判断是否为字体文件名
+// 入参: name 文件名
+// 返回: bool 是否为字体文件
+func isFontFileName(name string) bool {
+	switch strings.ToLower(path.Ext(name)) {
+	case ".ttf", ".otf", ".ttc":
+		return true
+	default:
+		return false
+	}
+}
+
 // fontRuleMatch 判断字体规则是否匹配
 // 入参: rule 字体匹配规则, name 字体名称
 // 返回: bool 是否匹配
 func fontRuleMatch(rule fontMatchRule, name string) bool {
+	return fontRuleMatchLevel(rule, name) != fontMatchNone
+}
+
+// fontRuleMatchLevel 获取字体规则匹配等级
+// 入参: rule 字体匹配规则, name 字体名称
+// 返回: int 匹配等级
+func fontRuleMatchLevel(rule fontMatchRule, name string) int {
 	name = fontNormalizeName(name)
 	if name == "" {
-		return false
+		return fontMatchNone
 	}
-	for _, key := range rule.Keys {
-		key = fontNormalizeName(key)
-		if key != "" && (name == key || strings.Contains(name, key)) {
-			return true
+	items := fontRuleNames(rule)
+	for _, item := range items {
+		item = fontNormalizeName(item)
+		if item != "" && name == item {
+			return fontMatchExact
 		}
 	}
-	return false
+	for _, item := range items {
+		item = fontNormalizeName(item)
+		if item != "" && (strings.HasPrefix(name, item) || strings.HasPrefix(item, name)) {
+			return fontMatchPartial
+		}
+	}
+	for _, item := range items {
+		item = fontNormalizeName(item)
+		if item != "" && (strings.Contains(name, item) || strings.Contains(item, name)) {
+			return fontMatchFuzzy
+		}
+	}
+	return fontMatchNone
+}
+
+// fontRuleNames 获取字体规则名称列表
+// 入参: rule 字体匹配规则
+// 返回: []string 字体规则名称列表
+func fontRuleNames(rule fontMatchRule) []string {
+	var result []string
+	result = append(result, rule.Keys...)
+	result = append(result, rule.Names...)
+	if rule.System != "" {
+		result = append(result, rule.System)
+	}
+	return result
 }
 
 // appendFontName 追加字体名称
diff --git a/ofdgo_renderer.go b/ofdgo_renderer.go
index 7ae9b48..6509179 100644
--- a/ofdgo_renderer.go
+++ b/ofdgo_renderer.go
@@ -470,6 +470,23 @@ func (r *Renderer) initCommon() {
 	r.defaultFontLoaded = r.loadDefaultFonts()
 }
 
+// childRenderer 创建继承当前配置的子渲染器
+// 入参: reader 子阅读器
+// 返回: *Renderer 子渲染器
+func (r *Renderer) childRenderer(reader *Reader) *Renderer {
+	opts := []RendererOption{
+		WithDPI(r.DPI),
+		WithAnnotations(r.RenderAnnotations),
+	}
+	if len(r.fontDirs) > 0 {
+		opts = append(opts, WithFontDirs(r.fontDirs...))
+	}
+	if len(r.fontFS) > 0 {
+		opts = append(opts, WithFontFS(r.fontFS...))
+	}
+	return NewRenderer(reader, opts...)
+}
+
 // renderImage 渲染图片
 // 入参: ctx 画布上下文, obj 图片对象, pageH 页面高度, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM
 func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float64, parentCTM *Matrix, boundaryInCTM bool) {
@@ -1194,14 +1211,12 @@ func (r *Renderer) loadFont(fontID string) *canvas.FontFamily {
 	}
 	for _, fsys := range r.fontFS {
 		for _, pattern := range fontFilePatterns(of.FontName, of.FamilyName) {
-			if matches, err := fs.Glob(fsys, pattern); err == nil {
-				for _, m := range matches {
-					resData, err := fs.ReadFile(fsys, m)
-					if err == nil {
-						if err := ff.LoadFont(resData, 0, fontStyle); err == nil {
-							r.FontMap[fontID] = ff
-							return ff
-						}
+			for _, m := range fontFSMatches(fsys, pattern) {
+				resData, err := fs.ReadFile(fsys, m)
+				if err == nil {
+					if err := ff.LoadFont(resData, 0, fontStyle); err == nil {
+						r.FontMap[fontID] = ff
+						return ff
 					}
 				}
 			}
@@ -1262,13 +1277,29 @@ func (r *Renderer) loadFont(fontID string) *canvas.FontFamily {
 // 入参: dir 目录, pattern 模式
 // 返回: []string 文件列表
 func (r *Renderer) globFontFiles(dir, pattern string) []string {
-	matches, _ := filepath.Glob(filepath.Join(dir, pattern))
-	var result []string
-	for _, m := range matches {
-		ext := strings.ToLower(filepath.Ext(m))
-		if ext == ".ttf" || ext == ".otf" || ext == ".ttc" {
-			result = append(result, m)
+	seen := make(map[string]bool)
+	buckets := make([][]string, fontMatchFuzzy+1)
+	add := func(name string, rank int) {
+		if !isFontFileName(name) {
+			return
 		}
+		if rank == fontMatchNone || seen[name] {
+			return
+		}
+		seen[name] = true
+		buckets[rank] = append(buckets[rank], name)
+	}
+	matches, _ := filepath.Glob(filepath.Join(dir, pattern))
+	for _, m := range matches {
+		add(m, matchFontPatternRank(pattern, filepath.Base(m)))
+	}
+	matches, _ = filepath.Glob(filepath.Join(dir, "*"))
+	for _, m := range matches {
+		add(m, matchFontPatternRank(pattern, filepath.Base(m)))
+	}
+	var result []string
+	for rank := fontMatchExact; rank <= fontMatchFuzzy; rank++ {
+		result = append(result, buckets[rank]...)
 	}
 	return result
 }
@@ -1357,17 +1388,7 @@ func (r *Renderer) renderStamp(ctx *canvas.Context, s Stamp, pageH float64) {
 			defer reader.Close()
 			doc, err := reader.Doc()
 			if err == nil {
-				opts := []RendererOption{
-					WithDPI(r.DPI),
-					WithAnnotations(r.RenderAnnotations),
-				}
-				if len(r.fontDirs) > 0 {
-					opts = append(opts, WithFontDirs(r.fontDirs...))
-				}
-				if len(r.fontFS) > 0 {
-					opts = append(opts, WithFontFS(r.fontFS...))
-				}
-				renderer := NewRenderer(reader, opts...)
+				renderer := r.childRenderer(reader)
 				for _, pageRef := range doc.Pages.Page {
 					content, err := reader.PageContent(pageRef)
 					if err != nil {