feat(前端界面): 优化单页适高滚动条

feat(更新依赖): 更新jbig2、canvas
feat(升级依赖): 升级jbig2、canvas
2026-08-30 20:22:39 +08:00 · 2026-08-24 09:37:21 +08:00 · 2026-08-23 21:25:54 +08:00 · 2026-08-21 23:00:56 +08:00 · 2026-07-28 11:52:42 +08:00 · 2026-07-28 11:12:21 +08:00
38 changed files with 8681 additions and 2641 deletions
@@ -27,7 +27,7 @@ go build -o ofdgo_webui.exe -trimpath -ldflags "-s -w -buildid=" ./cmd/webui/web
 go get -u github.com/xiaoqidun/ofdgo
 ```

-# 快速调用
+# 渲染输出
 ```go
 package main

@@ -59,5 +59,51 @@ func main() {
 }
 ```

+# 签名验证
+```go
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/xiaoqidun/ofdgo"
+)
+
+func main() {
+	// 1. 打开OFD文件
+	data, err := os.ReadFile("test.ofd")
+	if err != nil {
+		log.Fatal(err)
+	}
+	// 2. 验证OFD签名
+	reports, err := ofdgo.VerifySignaturesBytes(data)
+	if err != nil {
+		log.Fatal(err)
+	}
+	// 3. 判断验证结果
+	if len(reports) == 0 {
+		log.Println("文件未发现签名")
+		return
+	}
+	valid := true
+	for _, report := range reports {
+		if report.IntegrityValid() {
+			log.Printf("签名%s验证通过", report.ID)
+			continue
+		}
+		valid = false
+		if report.Error == "" {
+			log.Printf("签名%s验证失败", report.ID)
+		} else {
+			log.Printf("签名%s验证失败: %s", report.ID, report.Error)
+		}
+	}
+	if !valid {
+		os.Exit(1)
+	}
+}
+```
+
 # 授权协议
 本项目使用 [Apache License 2.0](https://github.com/xiaoqidun/ofdgo/blob/main/LICENSE) 授权协议
@@ -9,7 +9,7 @@
 <body>
 	<div class="app">
 		<header class="toolbar app-bar">
-			<input id="ofdInput" class="file-input" type="file" accept=".ofd,application/ofd,application/zip">
+			<input id="ofdInput" class="file-input" type="file" accept=".ofd">
 			<input id="fontInput" class="file-input" type="file" accept=".ttf,.otf,.ttc,font/*" multiple>
 			<div class="tool-group">
 				<button id="ofdButton" class="button primary" type="button" data-short="打开">打开</button>
@@ -36,8 +36,14 @@
 			</div>
 			<div class="tool-group">
 				<select id="pageExportFormat" class="format-select" title="单页格式" aria-label="单页格式" disabled></select>
-				<button id="exportPageButton" class="button" type="button" data-short="页" title="导出单页" aria-label="导出单页" disabled>单页</button>
-				<button id="exportButton" class="button" type="button" data-short="文档" title="导出文档 PDF" aria-label="导出文档 PDF" disabled>文档</button>
+				<select id="imageDPI" class="format-select dpi-select" title="图片 DPI" aria-label="图片 DPI" disabled>
+					<option value="96">96</option>
+					<option value="150">150</option>
+					<option value="300" selected>300</option>
+					<option value="600">600</option>
+				</select>
+				<button id="exportPageButton" class="button" type="button" data-short="单" title="导出单页" aria-label="导出单页" disabled>单页</button>
+				<button id="exportButton" class="button" type="button" data-short="全" title="导出文档 PDF" aria-label="导出文档 PDF" disabled>文档</button>
 			</div>
 		</header>

@@ -80,11 +86,22 @@
 						<dt>类型</dt>
 						<dd id="metaType">-</dd>
 					</div>
+					<div>
+						<dt>签名</dt>
+						<dd id="metaSignatures">0</dd>
+					</div>
 					<div>
 						<dt>字体</dt>
 						<dd id="metaFonts">0</dd>
 					</div>
 				</dl>
+				<section id="signaturePanel" class="signature-panel" aria-labelledby="signaturePanelTitle" hidden>
+					<div class="panel-row">
+						<div id="signaturePanelTitle" class="panel-title compact">签名</div>
+						<span id="signatureSummary" class="count-pill">0</span>
+					</div>
+					<div id="signatureList" class="signature-list"></div>
+				</section>
 				<section class="doc-font-panel" aria-labelledby="docFontPanelTitle">
 					<div class="panel-row">
 						<div id="docFontPanelTitle" class="panel-title compact">OFD 字体</div>
@@ -101,6 +118,7 @@
 							<button id="fontAddButton" class="small-button" type="button">添加</button>
 						</div>
 					</div>
+					<div id="fontPermissionHint" class="font-permission-hint" hidden>需授权读取系统字体</div>
 					<div id="fontList" class="font-list"></div>
 				</section>
 			</aside>
@@ -10,7 +10,7 @@
 	--text-muted: #66737f;
 	--accent: #0f7b68;
 	--accent-strong: #095c4e;
-	--focus: #c9892b;
+	--focus: #0f7b68;
 	--sidebar-width: clamp(220px, 20vw, 292px);
 	--bar-bg: #fbfcfd;
 	--bar-height: 40px;
@@ -25,10 +25,18 @@
 	box-sizing: border-box;
 }

+html {
+	width: 100%;
+	height: 100%;
+	overflow: hidden;
+}
+
 body {
 	margin: 0;
+	width: 100%;
 	min-width: 320px;
 	min-height: 100vh;
+	overflow: hidden;
 	background: #eef1f4;
 }

@@ -64,7 +72,7 @@ a:focus-visible {
 .app {
 	display: grid;
 	grid-template-rows: auto minmax(0, 1fr) auto;
-	width: 100vw;
+	width: 100%;
 	height: 100vh;
 	overflow: hidden;
 }
@@ -209,6 +217,10 @@ button:not(:disabled):hover {
 	color: #1f2428;
 }

+.dpi-select {
+	width: 54px;
+}
+
 .format-select:focus,
 .format-select:focus-visible {
 	border-color: var(--accent);
@@ -389,6 +401,10 @@ body[data-hide-meta] .meta-panel {
 	background-size: 24px 24px;
 }

+.viewer-panel.single-page-fits-height {
+	overflow-y: hidden;
+}
+
 .empty-state {
 	position: absolute;
 	inset: 0;
@@ -464,15 +480,18 @@ body[data-hide-meta] .meta-panel {
 }

 .page-frame {
+	display: grid;
+	align-items: safe center;
 	min-width: 100%;
 	min-height: 100%;
 	padding: var(--page-space);
+	padding-block: var(--fit-space, var(--page-space));
 }

 .svg-host {
 	display: grid;
 	justify-items: center;
-	gap: var(--page-space);
+	gap: var(--fit-gap, var(--fit-space, var(--page-space)));
 	width: max-content;
 	margin: 0 auto;
 }
@@ -511,6 +530,23 @@ body[data-hide-meta] .meta-panel {
 	display: none;
 }

+.stamp-highlight {
+	position: absolute;
+	z-index: 4;
+	border: 2px solid var(--accent);
+	background: rgba(15, 123, 104, 0.08);
+	box-shadow: 0 0 0 3px rgba(15, 123, 104, 0.16);
+	pointer-events: none;
+	animation: stampPulse 0.9s ease-in-out 2;
+}
+
+@keyframes stampPulse {
+	50% {
+		border-color: var(--accent-strong);
+		box-shadow: 0 0 0 5px rgba(15, 123, 104, 0.18);
+	}
+}
+
 .ofd-svg {
 	display: block;
 	max-width: none;
@@ -540,7 +576,8 @@ body[data-hide-meta] .meta-panel {
 }

 .font-panel,
-.doc-font-panel {
+.doc-font-panel,
+.signature-panel {
 	margin-top: 18px;
 	padding-top: 12px;
 	border-top: 1px solid var(--line);
@@ -561,12 +598,14 @@ body[data-hide-meta] .meta-panel {
 	white-space: nowrap;
 }

-.doc-font-list {
+.doc-font-list,
+.signature-list {
 	display: grid;
 	gap: 8px;
 }

-.doc-font-row {
+.doc-font-row,
+.signature-row {
 	display: grid;
 	gap: 6px;
 	padding: 9px;
@@ -577,6 +616,7 @@ body[data-hide-meta] .meta-panel {

 .page-list-item:not(:disabled):hover,
 .doc-font-row:hover,
+.signature-row:hover,
 .font-row:hover {
 	border-color: var(--line-strong);
 	background: #ffffff;
@@ -592,14 +632,26 @@ body[data-hide-meta] .meta-panel {
 	background: #fffdf7;
 }

-.doc-font-head {
+.signature-row.valid {
+	border-color: #bdd8cc;
+	background: #fbfefd;
+}
+
+.signature-row.invalid {
+	border-color: #e2c7c4;
+	background: #fffdfc;
+}
+
+.doc-font-head,
+.signature-head {
 	display: grid;
 	grid-template-columns: minmax(0, 1fr) auto;
 	align-items: start;
 	gap: 8px;
 }

-.doc-font-name {
+.doc-font-name,
+.signature-name {
 	overflow: hidden;
 	color: #1f2428;
 	font-size: 13px;
@@ -608,7 +660,51 @@ body[data-hide-meta] .meta-panel {
 	white-space: nowrap;
 }

-.doc-font-badges {
+.signature-name-button {
+	display: inline;
+	padding: 0;
+	border: 0;
+	background: transparent;
+	color: inherit;
+	font: inherit;
+	font-weight: inherit;
+	cursor: pointer;
+	text-align: left;
+}
+
+.signature-name-button:not(:disabled):hover {
+	background: transparent;
+	color: var(--accent-strong);
+	text-decoration: underline;
+}
+
+.signature-name-with-stamps {
+	white-space: normal;
+}
+
+.signature-stamp-group {
+	color: var(--text-muted);
+	font-weight: 400;
+}
+
+.signature-stamp-link {
+	padding: 0;
+	border: 0;
+	background: transparent;
+	color: var(--accent-strong);
+	font: inherit;
+	font-weight: 400;
+	line-height: inherit;
+	cursor: pointer;
+}
+
+.signature-stamp-link:not(:disabled):hover {
+	background: transparent;
+	text-decoration: underline;
+}
+
+.doc-font-badges,
+.signature-badges {
 	display: flex;
 	flex-wrap: wrap;
 	justify-content: flex-end;
@@ -616,6 +712,10 @@ body[data-hide-meta] .meta-panel {
 }

 .font-badge {
+	display: inline-flex;
+	align-items: center;
+	justify-content: center;
+	min-width: 30px;
 	padding: 3px 6px;
 	background: #eef1f4;
 	color: var(--text-muted);
@@ -635,11 +735,45 @@ body[data-hide-meta] .meta-panel {
 	color: #705719;
 }

-.font-badge.missing {
+.font-badge.missing,
+.font-badge.invalid {
 	background: #f9e8e5;
 	color: #803f38;
 }

+.font-badge.valid {
+	background: #e4f3ef;
+	color: var(--accent-strong);
+}
+
+.signature-line {
+	display: grid;
+	grid-template-columns: 30px minmax(0, 1fr);
+	align-items: start;
+	gap: 7px;
+	color: var(--text-muted);
+	font-size: 11px;
+	line-height: 1.35;
+}
+
+.signature-label {
+	color: #7b8791;
+	white-space: nowrap;
+}
+
+.signature-value {
+	min-width: 0;
+	overflow-wrap: anywhere;
+}
+
+.signature-line.ok .signature-value {
+	color: var(--accent-strong);
+}
+
+.signature-line.fail .signature-value {
+	color: #803f38;
+}
+
 .doc-font-detail {
 	color: var(--text-muted);
 	font-size: 11px;
@@ -652,6 +786,16 @@ body[data-hide-meta] .meta-panel {
 	gap: 8px;
 }

+.font-permission-hint {
+	margin: 0 0 8px;
+	padding: 7px 8px;
+	border: 1px solid var(--line);
+	background: #ffffff;
+	color: var(--text-muted);
+	font-size: 12px;
+	line-height: 1.35;
+}
+
 .font-row {
 	display: grid;
 	grid-template-columns: minmax(0, 1fr) auto;
@@ -742,6 +886,7 @@ body[data-hide-meta] .meta-panel {

 .app-footer {
 	justify-content: space-between;
+	overflow: hidden;
 	border-top: 1px solid var(--line);
 	color: var(--text-muted);
 	font-size: 12px;
@@ -749,9 +894,13 @@ body[data-hide-meta] .meta-panel {

 .footer-brand {
 	flex: 0 0 var(--sidebar-width);
+	min-width: 0;
+	overflow: hidden;
 	font-weight: 400;
 	color: var(--accent-strong);
 	text-decoration: none;
+	text-overflow: ellipsis;
+	white-space: nowrap;
 }

 .status-text {
@@ -772,6 +921,7 @@ body[data-hide-meta] .meta-panel {
 	flex: 0 0 var(--sidebar-width);
 	justify-content: flex-end;
 	min-width: 0;
+	overflow: hidden;
 }

 .app-footer a {
@@ -927,15 +1077,15 @@ body[data-hide-meta] .meta-panel {
 		min-width: 34px;
 	}

-	#exportButton {
-		padding-inline: 8px;
-	}
-
 	.format-select {
 		width: 52px;
 		padding: 0 3px;
 	}

+	.dpi-select {
+		width: 48px;
+	}
+
 	.footer-links {
 		justify-content: flex-end;
 	}
@@ -1,24 +1,25 @@
 module github.com/xiaoqidun/ofdgo

-go 1.25.0
+go 1.26.0

 require (
-	github.com/tdewolff/canvas v0.0.0-20260617131110-529326a1955e
-	github.com/xiaoqidun/jbig2 v0.0.0-20260707061149-c2ff34658234
-	golang.org/x/image v0.43.0
-	golang.org/x/text v0.39.0
+	github.com/tdewolff/canvas v0.0.0-20260822211237-56e622de465a
+	github.com/tdewolff/font v0.0.0-20260822205238-d0d2f004b117
+	github.com/xiaoqidun/jbig2 v0.0.0-20260823111534-2e67bcec7059
+	golang.org/x/image v0.45.0
+	golang.org/x/text v0.41.0
 )

 require (
-	codeberg.org/go-latex/latex v0.2.0 // indirect
-	codeberg.org/go-pdf/fpdf v0.11.1 // indirect
+	codeberg.org/go-latex/latex v0.3.0 // indirect
+	codeberg.org/go-pdf/fpdf v0.12.0 // indirect
 	github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 // indirect
 	github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 // indirect
 	github.com/BurntSushi/xgb v0.0.0-20210121224620-deaf085860bc // indirect
 	github.com/BurntSushi/xgbutil v0.0.0-20190907113008-ad855c713046 // indirect
 	github.com/ByteArena/poly2tri-go v0.0.0-20170716161910-d102ad91854f // indirect
 	github.com/Kagami/go-avif v0.1.0 // indirect
-	github.com/andybalholm/brotli v1.2.1 // indirect
+	github.com/andybalholm/brotli v1.2.2 // indirect
 	github.com/benoitkugler/textlayout v0.3.2 // indirect
 	github.com/benoitkugler/textprocessing v0.0.6 // indirect
 	github.com/go-fonts/latin-modern v0.3.3 // indirect
@@ -27,14 +28,14 @@ require (
 	github.com/kolesa-team/go-webp v1.0.5 // indirect
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
 	github.com/srwiley/scanx v0.0.0-20190309010443-e94503791388 // indirect
-	github.com/tdewolff/font v0.0.0-20260424075104-b5eeb1e23189 // indirect
-	github.com/tdewolff/minify/v2 v2.24.13 // indirect
-	github.com/tdewolff/parse/v2 v2.8.12 // indirect
+	github.com/tdewolff/minify/v2 v2.24.17 // indirect
+	github.com/tdewolff/parse/v2 v2.8.16 // indirect
 	github.com/wcharczuk/go-chart/v2 v2.1.2 // indirect
-	github.com/yuin/goldmark v1.8.2 // indirect
-	golang.org/x/net v0.53.0 // indirect
+	github.com/yuin/goldmark v1.8.5 // indirect
+	golang.org/x/net v0.58.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
 	gonum.org/v1/plot v0.17.0 // indirect
-	modernc.org/knuth v0.5.5 // indirect
+	modernc.org/knuth v0.6.0 // indirect
 	modernc.org/token v1.1.0 // indirect
 	star-tex.org/x/tex v0.7.1 // indirect
 )
@@ -1,15 +1,15 @@
 codeberg.org/go-fonts/dejavu v0.4.0 h1:2yn58Vkh4CFK3ipacWUAIE3XVBGNa0y1bc95Bmfx91I=
 codeberg.org/go-fonts/dejavu v0.4.0/go.mod h1:abni088lmhQJvso2Lsb7azCKzwkfcnttl6tL1UTWKzg=
-codeberg.org/go-fonts/liberation v0.5.0 h1:SsKoMO1v1OZmzkG2DY+7ZkCL9U+rrWI09niOLfQ5Bo0=
-codeberg.org/go-fonts/liberation v0.5.0/go.mod h1:zS/2e1354/mJ4pGzIIaEtm/59VFCFnYC7YV6YdGl5GU=
-codeberg.org/go-latex/latex v0.2.0 h1:Ol/a6VHY06N+5gPfewswymoRb5ZcKDXWVaVegcx4hbI=
-codeberg.org/go-latex/latex v0.2.0/go.mod h1:VJAwQir7/T8LZxj7xAPivISKiVOwkMpQ8bTuPQ31X0Y=
-codeberg.org/go-pdf/fpdf v0.11.1 h1:U8+coOTDVLxHIXZgGvkfQEi/q0hYHYvEHFuGNX2GzGs=
-codeberg.org/go-pdf/fpdf v0.11.1/go.mod h1:Y0DGRAdZ0OmnZPvjbMp/1bYxmIPxm0ws4tfoPOc4LjU=
+codeberg.org/go-fonts/liberation v0.6.0 h1:15Gh6SdwYve22CWCm9jYpVpRuaTh726av2TgHTHvAtQ=
+codeberg.org/go-fonts/liberation v0.6.0/go.mod h1:J15VAa+lyxdcI/Je7lDDDl6QOhLk9feNBnnwXqEHXOk=
+codeberg.org/go-latex/latex v0.3.0 h1:LKTaDHFbEC2PH1sh0sYv6PZ1pzs/g2aoeV1HItWj/bg=
+codeberg.org/go-latex/latex v0.3.0/go.mod h1:8ETijTpK2bFtwRAXLXe1RZJrYxnc5pibibZfQBj+Lk4=
+codeberg.org/go-pdf/fpdf v0.12.0 h1:g8E/1VqGqB2lZUUaqQrrTnA0IEJLPTTX1DZ0qS/ZmhU=
+codeberg.org/go-pdf/fpdf v0.12.0/go.mod h1:WJNJ2bvCj81rZBdhOf7lKOGoSl+OKMXcIcXqDcP8r5Y=
 git.sr.ht/~sbinet/cmpimg v0.1.0 h1:E0zPRk2muWuCqSKSVZIWsgtU9pjsw3eKHi8VmQeScxo=
 git.sr.ht/~sbinet/cmpimg v0.1.0/go.mod h1:FU12psLbF4TfNXkKH2ZZQ29crIqoiqTZmeQ7dkp/pxE=
-git.sr.ht/~sbinet/gg v0.7.0 h1:YmNf7YKd7diDMTPm86hZa1EM3pbkOyD/zzjl0LZUdNM=
-git.sr.ht/~sbinet/gg v0.7.0/go.mod h1:VYeli15tpMM4EvqlivlVbbyvWZlOU+EZn4XZmfBGUdM=
+git.sr.ht/~sbinet/gg v0.8.0 h1:PjQ4AgUWRz7Dy6PVBKMLLg96eRCos1U+H6F3FJuKWHo=
+git.sr.ht/~sbinet/gg v0.8.0/go.mod h1:XhlGCvSXts+BaZ1XMZLxLSFUDvwsJ/2El5F6XzPep6o=
 github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 h1:1qlsVAQJXZHsaM8b6OLVo6muQUQd4CwkH/D3fnnbHXA=
 github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298/go.mod h1:D+QujdIlUNfa0igpNMk6UIvlb6C252URs4yupRUV4lQ=
 github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 h1:lTG4HQym5oPKjL7nGs+csTgiDna685ZXjxijkne828g=
@@ -24,8 +24,8 @@ github.com/Kagami/go-avif v0.1.0 h1:8GHAGLxCdFfhpd4Zg8j1EqO7rtcQNenxIDerC/uu68w=
 github.com/Kagami/go-avif v0.1.0/go.mod h1:OPmPqzNdQq3+sXm0HqaUJQ9W/4k+Elbc3RSfJUemDKA=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b h1:slYM766cy2nI3BwyRiyQj/Ud48djTMtMebDqepE95rw=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b/go.mod h1:1KcenG0jGWcpt8ov532z81sp/kMMUG485J2InIOyADM=
-github.com/andybalholm/brotli v1.2.1 h1:R+f5xP285VArJDRgowrfb9DqL18yVK0gKAW/F+eTWro=
-github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/andybalholm/brotli v1.2.2 h1:HzTuoo2ErYQqf5qvcJInB8uvqSVxRttzkFexPWtnceM=
+github.com/andybalholm/brotli v1.2.2/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/benoitkugler/pstokenizer v1.0.0/go.mod h1:l1G2Voirz0q/jj0TQfabNxVsa8HZXh/VMxFSRALWTiE=
 github.com/benoitkugler/textlayout v0.3.2 h1:Y/LTkwpQ9G0Fia9yhPmZA9IR5AnE8Cq30j3C+Gx5/IE=
 github.com/benoitkugler/textlayout v0.3.2/go.mod h1:o+1hFV+JSHBC9qNLIuwVoLedERU7sBPgEFcuSgfvi/w=
@@ -33,8 +33,6 @@ github.com/benoitkugler/textlayout-testdata v0.1.1/go.mod h1:i/qZl09BbUOtd7Bu/W1
 github.com/benoitkugler/textprocessing v0.0.6 h1:obkMyj62GEPg3xUVYqROlCN22z1OleuZm6ULqX9Om1g=
 github.com/benoitkugler/textprocessing v0.0.6/go.mod h1:Io0gN08/PXEzrSOWFa88xHx2Xv3VjvLMY7H76YoI23A=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-fonts/latin-modern v0.3.3 h1:g2xNgI8yzdNzIVm+qvbMryB6yGPe0pSMss8QT3QwlJ0=
 github.com/go-fonts/latin-modern v0.3.3/go.mod h1:tHaiWDGze4EPB0Go4cLT5M3QzRY3peya09Z/8KSCrpY=
 github.com/go-text/typesetting v0.3.4 h1:YYurUOtEb9kGSOz4uE3k4OpBGsp1dDL8+fjCeaFamAU=
@@ -59,28 +57,29 @@ github.com/srwiley/scanx v0.0.0-20190309010443-e94503791388 h1:ZdkidVdpLW13BQ9a+
 github.com/srwiley/scanx v0.0.0-20190309010443-e94503791388/go.mod h1:C/WY5lmWfMtPFYYBTd3Lzdn4FTLr+RxlIeiBNye+/os=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
-github.com/tdewolff/canvas v0.0.0-20260617131110-529326a1955e h1:Z9HqI3WUPBDwJEDH9BCLpQGvjmGs0XNRDBLry4shZfs=
-github.com/tdewolff/canvas v0.0.0-20260617131110-529326a1955e/go.mod h1:Lz12ClttuKvo2jb1UxBfJJWmKV0LmEc8IRo/30R7z+k=
-github.com/tdewolff/font v0.0.0-20260424075104-b5eeb1e23189 h1:wP/+8oeXiF55DUy9U0BP4iDD2mNu+o7evt5QLbLHv9E=
-github.com/tdewolff/font v0.0.0-20260424075104-b5eeb1e23189/go.mod h1:KjNTiF0TXOXJyWGS/0DPXRknEC20c12kc0JcCYNqtz4=
-github.com/tdewolff/minify/v2 v2.24.13 h1:xrcF7gKDnUszseEY9WX9mUlZII2v2Go/QAcAwRASw58=
-github.com/tdewolff/minify/v2 v2.24.13/go.mod h1:emvwoYeIl8bfAKqRU5ww95LX9Gpggpqv/naal9a8Yq0=
-github.com/tdewolff/parse/v2 v2.8.12 h1:5BBjfaCv482v3nltlS0u6wH1xJaxjR6ofDrWttNvROg=
-github.com/tdewolff/parse/v2 v2.8.12/go.mod h1:Hwlni2tiVNKyzR1o6nUs4FOF07URA+JLBLd6dlIXYqo=
-github.com/tdewolff/test v1.0.11/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
+github.com/stretchr/testify v1.12.1 h1:EuwCh5fleGS7H32xRwO3wRGT7DxrDhLAT6FF8MpWDWE=
+github.com/stretchr/testify v1.12.1/go.mod h1:MDEgiDPPsNp5cuIrHPPCyornHKgEVbtFUmoNlxoYthg=
+github.com/tdewolff/canvas v0.0.0-20260822211237-56e622de465a h1:riaFBiYaIv1gM31xdcU0Yo7bdp3WebF4dggO/JK0g/8=
+github.com/tdewolff/canvas v0.0.0-20260822211237-56e622de465a/go.mod h1:K9Ux3cwFtyAFRITZ46g7v+ORXgI3ENtQa5rL9yjNz5Y=
+github.com/tdewolff/font v0.0.0-20260822205238-d0d2f004b117 h1:5vSJjsbV9AH0U+Ex0uej8ROrpOBlOVBrw0mGlVef7oo=
+github.com/tdewolff/font v0.0.0-20260822205238-d0d2f004b117/go.mod h1:ipESUihcEdgRBhIwTRHmBTOMamccMQrp4iCxfa1aFws=
+github.com/tdewolff/minify/v2 v2.24.17 h1:6AbitfVyq0M7aW6i+XL7+49DeTQZwloOMs9O574arBg=
+github.com/tdewolff/minify/v2 v2.24.17/go.mod h1:kVqn9vxXUKtlHexSNrWbYePqioOT5mc4ou/KVSMpfCM=
+github.com/tdewolff/parse/v2 v2.8.16 h1:bLk5svUOQRkW/Y2SJ+DeENSIkZBcTIkq+Atyv5D8feI=
+github.com/tdewolff/parse/v2 v2.8.16/go.mod h1:XdsoSFThlVIRIajAuqz1evNY7bagZS8LBOPA3aVopwQ=
 github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/wcharczuk/go-chart/v2 v2.1.2 h1:Y17/oYNuXwZg6TFag06qe8sBajwwsuvPiJJXcUcLL6E=
 github.com/wcharczuk/go-chart/v2 v2.1.2/go.mod h1:Zi4hbaqlWpYajnXB2K22IUYVXRXaLfSGNNR7P4ukyyQ=
-github.com/xiaoqidun/jbig2 v0.0.0-20260707061149-c2ff34658234 h1:aTUfzcRBfRYrEX0gxWRRQJGd/z9LJTu15eFC9pNVT00=
-github.com/xiaoqidun/jbig2 v0.0.0-20260707061149-c2ff34658234/go.mod h1:c5zFNbM18iSRcfS9ziMZquU3lFJGmN1w6CUfuEDw0WI=
+github.com/xiaoqidun/jbig2 v0.0.0-20260823111534-2e67bcec7059 h1:/JXxWbNTePSVfshS7BVRm75Kh1/5rixvLpgTRw7MMv8=
+github.com/xiaoqidun/jbig2 v0.0.0-20260823111534-2e67bcec7059/go.mod h1:mdoUQnVPIA4yS0/+ZrtxJNiDdbphI0RMu+DPfxXfVhE=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-github.com/yuin/goldmark v1.8.2 h1:kEGpgqJXdgbkhcOgBxkC0X0PmoPG1ZyoZ117rDVp4zE=
-github.com/yuin/goldmark v1.8.2/go.mod h1:ip/1k0VRfGynBgxOz0yCqHrbZXhcjxyuS66Brc7iBKg=
+github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=
+github.com/yuin/goldmark v1.8.5/go.mod h1:ip/1k0VRfGynBgxOz0yCqHrbZXhcjxyuS66Brc7iBKg=
+go.yaml.in/yaml/v3 v3.0.5 h1:N6y/pJk8buWs9NY5ERU2HSMfm+IuD/OtfdAnq6kESPw=
+go.yaml.in/yaml/v3 v3.0.5/go.mod h1:HVTZu1O7/Vkt2N+BFy8Zza+lnLsABggaTM2ZpNIGuKg=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.13.0/go.mod h1:y6Z2r+Rw4iayiXXAIxJIDAJ1zMW4yaTpebo8fPOliYc=
@@ -88,8 +87,8 @@ golang.org/x/crypto v0.19.0/go.mod h1:Iy9bg/ha4yyC70EfRS8jz+B6ybOBKMaSxLj6P6oBDf
 golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
 golang.org/x/image v0.0.0-20210504121937-7319ad40d33e/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/image v0.18.0/go.mod h1:4yyo5vMFQjVjUcVk4jEQcU9MGy/rulF5WvUILseCM2E=
-golang.org/x/image v0.43.0 h1:FLxcP4ec2350nTfOC8ysKtqYSIFbk/QGjw1ZHNP4tsY=
-golang.org/x/image v0.43.0/go.mod h1:rrpelvGFt+kLPAjPM4HeWPgrl0FtafueU//e5N0qk/Q=
+golang.org/x/image v0.45.0 h1:FMb1nTbH5H9vF55SriQHgFw5GnNL9Jg6L25BwXKzhB0=
+golang.org/x/image v0.45.0/go.mod h1:n62x/7RqlwXDvGsSU4u6IUTUf6KghUZ9Bt7cG/T9Fx4=
 golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
@@ -104,8 +103,8 @@ golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
 golang.org/x/net v0.15.0/go.mod h1:idbUs1IY1+zTqbi8yxTbhexhEEk5ur9LInksu6HrEpk=
 golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
 golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
-golang.org/x/net v0.53.0 h1:d+qAbo5L0orcWAr0a9JweQpjXF19LMXJE8Ey7hwOdUA=
-golang.org/x/net v0.53.0/go.mod h1:JvMuJH7rrdiCfbeHoo3fCQU24Lf5JJwT9W3sJFulfgs=
+golang.org/x/net v0.58.0 h1:ynWG7rqYi4ccpTEuPZ2QGWHktVEM9DMCj9yzDE0Q7To=
+golang.org/x/net v0.58.0/go.mod h1:YwCddHnFlT7eLQqVprV19OnhLGtc5xOKgE0RyqgfWAU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -123,6 +122,8 @@ golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
+golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/telemetry v0.0.0-20240228155512-f48c80bd79b2/go.mod h1:TeRTkGYfJXctD9OcfyVLyj2J3IxLnKwHJR8f4D8a3YE=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
@@ -141,8 +142,8 @@ golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
-golang.org/x/text v0.39.0 h1:UbZz4pLOvn600D6Oh6GGEI6VAmndrEBLv8/6BEXzyus=
-golang.org/x/text v0.39.0/go.mod h1:3UwRclnC2g0TU9x8PZiyfOajCd1zaUNHF9cvqcQZ+ZM=
+golang.org/x/text v0.41.0 h1:vz/seA0lnX87Othu2f/0L24RcgrXD9/YFTSuGjj3rH8=
+golang.org/x/text v0.41.0/go.mod h1:jvf1O8ajNzZqhSrQBPbutR/EB83Cc0CFrezNQIwbb5M=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
@@ -154,10 +155,8 @@ gonum.org/v1/plot v0.17.0 h1:d0DwPVBe9jnEGqQBoZGl/P2M9WciJbG2CnV59C9QBT4=
 gonum.org/v1/plot v0.17.0/go.mod h1:ipt2GUN1oqzr2O7wCjLDtw1ShfIYYNBp4o0O1Ez5B3Y=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-modernc.org/knuth v0.5.5 h1:6lap2U/ISm8aC/4NU58ALFCRllNPaK0EZcIGY/oDgUg=
-modernc.org/knuth v0.5.5/go.mod h1:e5SBb35HQBj2aFwbBO3ClPcViLY3Wi0LzaOd7c/3qMk=
+modernc.org/knuth v0.6.0 h1:zLv0hzgdcpcCUB/iMwpQvn9m/iciqO/hyNXlpWymMKU=
+modernc.org/knuth v0.6.0/go.mod h1:ISAZV+URZIlE8h1BwNVg1NzpwHKndV5lQ13NPPj3tds=
 modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
 modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
 rsc.io/pdf v0.1.1 h1:k1MczvYDUvJBe93bYd7wrZLLUEcLZAuF824/I4e5Xr4=
@@ -17,7 +17,6 @@
 package webui

 import (
-	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"syscall/js"
@@ -45,7 +44,7 @@ func RunWASM() {
 	registerCallback("ofdgoExportFormats", exportFormats)
 	registerCallback("ofdgoExportPage", exportPage)
 	registerCallback("ofdgoExportPDF", exportPDF)
-	registerCallback("ofdgoFontCandidates", fontCandidates)
+	registerCallback("ofdgoFontSystemNames", fontSystemNames)
 	select {}
 }

@@ -57,6 +56,9 @@ func registerCallback(name string, fn func([]js.Value) (any, error)) {
 		if err != nil {
 			return encodeResult(apiResult{OK: false, Error: err.Error()})
 		}
+		if result, ok := data.(js.Value); ok {
+			return result
+		}
 		return encodeResult(apiResult{OK: true, Data: data})
 	})
 	js.Global().Set(name, cb)
@@ -113,7 +115,18 @@ func renderPage(args []js.Value) (any, error) {
 	if len(args) == 0 {
 		return nil, fmt.Errorf("missing page index")
 	}
-	return currentSession.RenderPageSVG(args[0].Int())
+	page, err := currentSession.RenderPageSVG(args[0].Int())
+	if err != nil {
+		return nil, err
+	}
+	return successResult(map[string]any{
+		"index":  page.Index,
+		"number": page.Number,
+		"id":     page.ID,
+		"width":  page.Width,
+		"height": page.Height,
+		"svg":    page.SVG,
+	}), nil
 }

 // exportFormats 获取导出格式
@@ -130,21 +143,21 @@ func exportPage(args []js.Value) (any, error) {
 	if currentSession == nil {
 		return nil, fmt.Errorf("ofd document is not opened")
 	}
-	if len(args) < 2 {
+	if len(args) < 3 {
 		return nil, fmt.Errorf("missing export page arguments")
 	}
-	data, format, err := currentSession.ExportPage(args[0].Int(), args[1].String())
+	data, format, err := currentSession.ExportPage(args[0].Int(), args[1].String(), args[2].Float())
 	if err != nil {
 		return nil, err
 	}
-	return map[string]any{
-		"base64":    base64.StdEncoding.EncodeToString(data),
+	return successResult(map[string]any{
+		"bytes":     bytesToJS(data),
 		"size":      len(data),
 		"format":    format.Value,
 		"label":     format.Label,
 		"extension": format.Extension,
 		"mime":      format.MIME,
-	}, nil
+	}), nil
 }

 // exportPDF 导出OFD文档为PDF
@@ -158,18 +171,37 @@ func exportPDF(args []js.Value) (any, error) {
 	if err != nil {
 		return nil, err
 	}
-	return map[string]any{
-		"base64": base64.StdEncoding.EncodeToString(data),
+	return successResult(map[string]any{
+		"bytes": bytesToJS(data),
 		"size":  len(data),
-	}, nil
+	}), nil
 }

-// fontCandidates 获取字体候选名称
+// successResult 创建成功接口结果
+// 入参: data 返回数据
+// 返回: js.Value 接口结果
+func successResult(data any) js.Value {
+	result := js.Global().Get("Object").New()
+	result.Set("ok", true)
+	result.Set("data", data)
+	return result
+}
+
+// bytesToJS 将字节数据转换为Uint8Array
+// 入参: data 字节数据
+// 返回: js.Value Uint8Array对象
+func bytesToJS(data []byte) js.Value {
+	value := js.Global().Get("Uint8Array").New(len(data))
+	js.CopyBytesToJS(value, data)
+	return value
+}
+
+// fontSystemNames 获取系统字体名称
 // 入参: args 浏览器参数
-// 返回: any 字体候选名称, error 错误信息
-func fontCandidates(args []js.Value) (any, error) {
+// 返回: any 系统字体名称, error 错误信息
+func fontSystemNames(args []js.Value) (any, error) {
 	names := stringsFromJS(jsArg(args, 0))
-	return ofdgo.FontCandidateNames(names...), nil
+	return ofdgo.FontSystemNames(names...), nil
 }

 // bytesFromJS 从浏览器值读取二进制数据
@@ -39,11 +39,66 @@ type FontFile = ofdgo.FontFile
 // FontInfo OFD字体信息
 type FontInfo = ofdgo.FontInfo

+// SignatureInfo 签名验证信息
+type SignatureInfo struct {
+	ID                   string               `json:"id"`
+	Type                 string               `json:"type"`
+	Valid                bool                 `json:"valid"`
+	Version              string               `json:"version,omitempty"`
+	SealType             string               `json:"sealType,omitempty"`
+	SealID               string               `json:"sealId,omitempty"`
+	SealName             string               `json:"sealName,omitempty"`
+	SealVendor           string               `json:"sealVendor,omitempty"`
+	Signer               string               `json:"signer,omitempty"`
+	SignatureDateTime    string               `json:"signatureDateTime,omitempty"`
+	Provider             string               `json:"provider,omitempty"`
+	Company              string               `json:"company,omitempty"`
+	DataHashOK           bool                 `json:"dataHashOK"`
+	SignedValueOK        bool                 `json:"signedValueOK"`
+	SealOK               bool                 `json:"sealOK"`
+	SealMatchOK          bool                 `json:"sealMatchOK"`
+	CertOK               bool                 `json:"certOK"`
+	SignatureTimeChecked bool                 `json:"signatureTimeChecked,omitempty"`
+	SignatureTimeOK      bool                 `json:"signatureTimeOK,omitempty"`
+	SealTimeChecked      bool                 `json:"sealTimeChecked,omitempty"`
+	SealTimeOK           bool                 `json:"sealTimeOK,omitempty"`
+	SealCertTimeChecked  bool                 `json:"sealCertTimeChecked,omitempty"`
+	SealCertTimeOK       bool                 `json:"sealCertTimeOK,omitempty"`
+	CertTimeChecked      bool                 `json:"certTimeChecked,omitempty"`
+	CertTimeOK           bool                 `json:"certTimeOK,omitempty"`
+	CertTrustChecked     bool                 `json:"certTrustChecked,omitempty"`
+	CertTrustOK          bool                 `json:"certTrustOK,omitempty"`
+	ReferenceCount       int                  `json:"referenceCount"`
+	ReferencePassed      int                  `json:"referencePassed"`
+	SignatureMethod      string               `json:"signatureMethod,omitempty"`
+	DigestMethod         string               `json:"digestMethod,omitempty"`
+	SignSerial           string               `json:"signSerial,omitempty"`
+	SignSubject          string               `json:"signSubject,omitempty"`
+	SignIssuer           string               `json:"signIssuer,omitempty"`
+	SealSubject          string               `json:"sealSubject,omitempty"`
+	Stamps               []SignatureStampInfo `json:"stamps,omitempty"`
+	Error                string               `json:"error,omitempty"`
+}
+
+// SignatureStampInfo 签名外观信息
+type SignatureStampInfo struct {
+	ID       string  `json:"id,omitempty"`
+	Page     int     `json:"page,omitempty"`
+	PageID   string  `json:"pageId,omitempty"`
+	Boundary string  `json:"boundary,omitempty"`
+	X        float64 `json:"x,omitempty"`
+	Y        float64 `json:"y,omitempty"`
+	Width    float64 `json:"width,omitempty"`
+	Height   float64 `json:"height,omitempty"`
+}
+
 // Session WebUI文档会话
 type Session struct {
 	Reader    *ofdgo.Reader
 	Renderer  *ofdgo.Renderer
 	doc       *ofdgo.Document
+	pageCache map[int]*ofdgo.PageContent
+	boxCache  map[int]ofdgo.Box
 }

 // DocumentInfo 文档信息
@@ -57,7 +112,10 @@ type DocumentInfo struct {
 	ModDate        string          `json:"modDate"`
 	PageCount      int             `json:"pageCount"`
 	FontCount      int             `json:"fontCount"`
+	SignatureCount int             `json:"signatureCount"`
+	SignatureError string          `json:"signatureError,omitempty"`
 	Fonts          []FontInfo      `json:"fonts"`
+	Signatures     []SignatureInfo `json:"signatures"`
 	Pages          []PageInfo      `json:"pages"`
 }

@@ -146,7 +204,13 @@ func Open(data []byte, opts OpenOptions) (*Session, error) {
 		rendererOptions = append(rendererOptions, ofdgo.WithFontFS(fontFS))
 	}
 	rendererOptions = append(rendererOptions, ofdgo.WithAnnotations(opts.RenderAnnotations))
-	return &Session{Reader: reader, Renderer: ofdgo.NewRenderer(reader, rendererOptions...), doc: doc}, nil
+	return &Session{
+		Reader:    reader,
+		Renderer:  ofdgo.NewRenderer(reader, rendererOptions...),
+		doc:       doc,
+		pageCache: make(map[int]*ofdgo.PageContent),
+		boxCache:  make(map[int]ofdgo.Box),
+	}, nil
 }

 // Close 关闭文档会话
@@ -167,10 +231,12 @@ func (s *Session) Info() DocumentInfo {
 		PageCount: len(s.doc.Pages.Page),
 		Pages:     make([]PageInfo, 0, len(s.doc.Pages.Page)),
 	}
-	if fonts, err := s.Renderer.FontInfos(); err == nil {
-		info.Fonts = fonts
+	if signatures, err := s.signatureInfos(); err == nil {
+		info.Signatures = signatures
+	} else {
+		info.SignatureError = err.Error()
 	}
-	info.FontCount = len(info.Fonts)
+	info.SignatureCount = len(info.Signatures)
 	if docInfo, err := s.Reader.DocInfo(); err == nil && docInfo != nil {
 		info.Title = docInfo.Title
 		info.Author = docInfo.Author
@@ -178,16 +244,22 @@ func (s *Session) Info() DocumentInfo {
 		info.CreationDate = docInfo.CreationDate
 		info.ModDate = docInfo.ModDate
 	}
+	pages := make([]*ofdgo.PageContent, 0, len(s.doc.Pages.Page))
 	for index, pageRef := range s.doc.Pages.Page {
 		pageInfo := PageInfo{Index: index, ID: pageRef.ID}
-		if page, err := s.Reader.PageContent(pageRef); err == nil {
-			if box, err := s.Renderer.GetPageBox(page); err == nil {
+		if _, page, err := s.pageContent(index); err == nil {
+			pages = append(pages, page)
+			if box, err := s.pageBox(index, page); err == nil {
 				pageInfo.Width = box.W
 				pageInfo.Height = box.H
 			}
 		}
 		info.Pages = append(info.Pages, pageInfo)
 	}
+	if fonts, err := s.Renderer.FontInfosFromPages(pages); err == nil {
+		info.Fonts = fonts
+	}
+	info.FontCount = len(info.Fonts)
 	return info
 }

@@ -199,7 +271,7 @@ func (s *Session) RenderPageSVG(index int) (PageSVG, error) {
 	if err != nil {
 		return PageSVG{}, err
 	}
-	box, err := s.Renderer.GetPageBox(page)
+	box, err := s.pageBox(index, page)
 	if err != nil {
 		return PageSVG{}, err
 	}
@@ -211,9 +283,9 @@ func (s *Session) RenderPageSVG(index int) (PageSVG, error) {
 }

 // ExportPage 导出单页
-// 入参: index 页面索引, value 导出格式
+// 入参: index 页面索引, value 导出格式, dpi 图片DPI
 // 返回: []byte 文件数据, ExportFormat 导出格式, error 错误信息
-func (s *Session) ExportPage(index int, value string) ([]byte, ExportFormat, error) {
+func (s *Session) ExportPage(index int, value string, dpi float64) ([]byte, ExportFormat, error) {
 	format, ok := exportFormat(value)
 	if !ok {
 		return nil, ExportFormat{}, fmt.Errorf("unsupported export format %s", value)
@@ -231,13 +303,13 @@ func (s *Session) ExportPage(index int, value string) ([]byte, ExportFormat, err
 	case "eps":
 		err = s.Renderer.RenderToEPS(page, &buf)
 	case "png":
-		img, renderErr := s.Renderer.RenderToImage(page)
+		img, renderErr := s.renderPageImage(page, dpi)
 		if renderErr != nil {
 			return nil, ExportFormat{}, renderErr
 		}
 		err = png.Encode(&buf, img)
 	case "jpg":
-		img, renderErr := s.Renderer.RenderToImage(page)
+		img, renderErr := s.renderPageImage(page, dpi)
 		if renderErr != nil {
 			return nil, ExportFormat{}, renderErr
 		}
@@ -249,6 +321,142 @@ func (s *Session) ExportPage(index int, value string) ([]byte, ExportFormat, err
 	return buf.Bytes(), format, nil
 }

+// renderPageImage 渲染页面图片
+// 入参: page 页面内容, dpi 图片DPI
+// 返回: image.Image 图像对象, error 错误信息
+func (s *Session) renderPageImage(page *ofdgo.PageContent, dpi float64) (image.Image, error) {
+	if dpi <= 0 {
+		return s.Renderer.RenderToImage(page)
+	}
+	oldDPI := s.Renderer.DPI
+	s.Renderer.DPI = dpi
+	defer func() {
+		s.Renderer.DPI = oldDPI
+	}()
+	return s.Renderer.RenderToImage(page)
+}
+
+// signatureInfos 获取签名验证信息
+// 返回: []SignatureInfo 签名验证信息, error 错误信息
+func (s *Session) signatureInfos() ([]SignatureInfo, error) {
+	reports, err := s.Reader.VerifySignatures()
+	if err != nil {
+		return nil, err
+	}
+	infos := make([]SignatureInfo, 0, len(reports))
+	for _, report := range reports {
+		infos = append(infos, signatureInfo(report))
+	}
+	return infos, nil
+}
+
+// signatureInfo 转换签名验证信息
+// 入参: report 签名验证报告
+// 返回: SignatureInfo 签名验证信息
+func signatureInfo(report ofdgo.SignatureVerifyReport) SignatureInfo {
+	return SignatureInfo{
+		ID:                   report.ID,
+		Type:                 string(report.Type),
+		Valid:                report.Valid,
+		Version:              report.Provider.Version,
+		SealType:             report.SealType,
+		SealID:               report.SealInfo.ID,
+		SealName:             report.SealInfo.Name,
+		SealVendor:           report.SealInfo.VendorID,
+		Signer:               signatureSigner(report),
+		SignatureDateTime:    report.SignatureDateTime,
+		Provider:             report.Provider.ProviderName,
+		Company:              report.Provider.Company,
+		DataHashOK:           report.DataHashOK,
+		SignedValueOK:        report.SignedValueOK,
+		SealOK:               report.SealOK,
+		SealMatchOK:          report.SealMatchOK,
+		CertOK:               report.CertOK,
+		SignatureTimeChecked: report.SignatureTimeChecked,
+		SignatureTimeOK:      report.SignatureTimeOK,
+		SealTimeChecked:      report.SealTimeChecked,
+		SealTimeOK:           report.SealTimeOK,
+		SealCertTimeChecked:  report.SealCertTimeChecked,
+		SealCertTimeOK:       report.SealCertTimeOK,
+		CertTimeChecked:      report.CertTimeChecked,
+		CertTimeOK:           report.CertTimeOK,
+		CertTrustChecked:     report.CertTrustChecked,
+		CertTrustOK:          report.CertTrustOK,
+		ReferenceCount:       len(report.References),
+		ReferencePassed:      signatureReferencePassed(report.References),
+		SignatureMethod:      report.SignatureMethod,
+		DigestMethod:         report.DigestMethod,
+		SignSerial:           report.SignCert.SerialNumber,
+		SignSubject:          report.SignCert.Subject,
+		SignIssuer:           report.SignCert.Issuer,
+		SealSubject:          report.SealCert.Subject,
+		Stamps:               signatureStampInfos(report.StampPositions),
+		Error:                signatureReportError(report),
+	}
+}
+
+// signatureSigner 获取签名人名称
+// 入参: report 签名验证报告
+// 返回: string 签名人名称
+func signatureSigner(report ofdgo.SignatureVerifyReport) string {
+	if report.Signer != "" {
+		return report.Signer
+	}
+	if report.SignCert.CommonName != "" {
+		return report.SignCert.CommonName
+	}
+	if report.SignCert.Organization != "" {
+		return report.SignCert.Organization
+	}
+	return report.SignCert.Subject
+}
+
+// signatureReferencePassed 获取已通过保护文件数量
+// 入参: refs 保护文件验证结果
+// 返回: int 已通过保护文件数量
+func signatureReferencePassed(refs []ofdgo.SignatureReferenceVerify) int {
+	count := 0
+	for _, ref := range refs {
+		if ref.OK {
+			count++
+		}
+	}
+	return count
+}
+
+// signatureReportError 获取签名错误信息
+// 入参: report 签名验证报告
+// 返回: string 错误信息
+func signatureReportError(report ofdgo.SignatureVerifyReport) string {
+	if report.Error != "" && report.StampPositionError != "" {
+		return report.Error + "; " + report.StampPositionError
+	}
+	if report.Error != "" {
+		return report.Error
+	}
+	return report.StampPositionError
+}
+
+// signatureStampInfos 转换签名外观位置
+// 入参: positions 签名外观位置
+// 返回: []SignatureStampInfo 签名外观信息
+func signatureStampInfos(positions []ofdgo.SignatureStampPosition) []SignatureStampInfo {
+	infos := make([]SignatureStampInfo, 0, len(positions))
+	for _, position := range positions {
+		infos = append(infos, SignatureStampInfo{
+			ID:       position.ID,
+			Page:     position.Page,
+			PageID:   position.PageID,
+			Boundary: position.Boundary,
+			X:        position.Box.X,
+			Y:        position.Box.Y,
+			Width:    position.Box.W,
+			Height:   position.Box.H,
+		})
+	}
+	return infos
+}
+
 // ExportPDF 导出文档为PDF
 // 返回: []byte PDF文件数据, error 错误信息
 func (s *Session) ExportPDF() ([]byte, error) {
@@ -284,9 +492,28 @@ func (s *Session) pageContent(index int) (ofdgo.Page, *ofdgo.PageContent, error)
 		return ofdgo.Page{}, nil, fmt.Errorf("page index %d out of range", index)
 	}
 	pageRef := s.doc.Pages.Page[index]
+	if page, ok := s.pageCache[index]; ok {
+		return pageRef, page, nil
+	}
 	page, err := s.Reader.PageContent(pageRef)
 	if err != nil {
 		return ofdgo.Page{}, nil, err
 	}
+	s.pageCache[index] = page
 	return pageRef, page, nil
 }
+
+// pageBox 获取页面物理区域
+// 入参: index 页面索引, page 页面内容
+// 返回: ofdgo.Box 页面物理区域, error 错误信息
+func (s *Session) pageBox(index int, page *ofdgo.PageContent) (ofdgo.Box, error) {
+	if box, ok := s.boxCache[index]; ok {
+		return box, nil
+	}
+	box, err := s.Renderer.GetPageBox(page)
+	if err != nil {
+		return ofdgo.Box{}, err
+	}
+	s.boxCache[index] = box
+	return box, nil
+}
@@ -43,7 +43,7 @@ func Open(path string) (*Reader, error) {
 	return reader, nil
 }

-// NewReader 从流创建一个 OFD 阅读器
+// NewReader 从IO读取器创建OFD阅读器
 // 入参: r IO读取器, size 数据大小
 // 返回: *Reader 阅读器实例, error 错误信息
 func NewReader(r io.ReaderAt, size int64) (*Reader, error) {
@@ -71,6 +71,14 @@ func NewRenderer(reader *Reader, opts ...RendererOption) *Renderer {
 		DrawParams:            reader.drawParamCache,
 		CompositeGraphicUnits: reader.compositeGraphicUnitCache,
 		FontMap:               make(map[string]*canvas.FontFamily),
+		FontGIDMap:            make(map[string]map[uint16]rune),
+		FontCIDMap:            make(map[string]map[uint16]rune),
+		fontCache:             make(map[fontCacheKey]*canvas.FontFamily),
+		fontSourceCache:       make(map[string][]fontSource),
+		fontSourceUsed:        make(map[string]fontSource),
+		fontDirCandidates:     make(map[string][]fontFileCandidate),
+		textGlyphPathCache:    make(map[textGlyphPathCacheKey]textGlyphPathCacheValue),
+		templatePageCache:     make(map[string]*PageContent),
 	}
 	for _, opt := range opts {
 		opt(r)
@@ -0,0 +1,198 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"encoding/xml"
+	"strconv"
+)
+
+// Action 动作
+type Action struct {
+	Event  string  `xml:"Event,attr"`
+	Region *Region `xml:"Region"`
+	Goto   *Goto   `xml:"Goto"`
+	URI    *URI    `xml:"URI"`
+	GotoA  *GotoA  `xml:"GotoA"`
+	Sound  *Sound  `xml:"Sound"`
+	Movie  *Movie  `xml:"Movie"`
+}
+
+// Goto 文档内跳转动作
+type Goto struct {
+	Dest     *Dest         `xml:"Dest"`
+	Bookmark *GotoBookmark `xml:"Bookmark"`
+}
+
+// Dest 文档内跳转目标
+type Dest struct {
+	Type   string  `xml:"Type,attr"`
+	PageID string  `xml:"PageID,attr"`
+	Left   float64 `xml:"Left"`
+	Right  float64 `xml:"Right"`
+	Top    float64 `xml:"Top"`
+	Bottom float64 `xml:"Bottom"`
+	Zoom   float64 `xml:"Zoom"`
+}
+
+// GotoBookmark 书签跳转目标
+type GotoBookmark struct {
+	Name string `xml:"Name,attr"`
+}
+
+// URI URI动作
+type URI struct {
+	URI  string `xml:"URI,attr"`
+	Base string `xml:"Base,attr"`
+}
+
+// GotoA 附件动作
+type GotoA struct {
+	AttachID  string `xml:"AttachID,attr"`
+	NewWindow *bool  `xml:"NewWindow,attr"`
+}
+
+// Sound 音频动作
+type Sound struct {
+	ResourceID  string `xml:"ResourceID,attr"`
+	Volume      *int   `xml:"Volume,attr"`
+	Repeat      bool   `xml:"Repeat,attr"`
+	Synchronous bool   `xml:"Synchronous,attr"`
+}
+
+// Movie 视频动作
+type Movie struct {
+	ResourceID string `xml:"ResourceID,attr"`
+	Operator   string `xml:"Operator,attr"`
+}
+
+// Region 动作区域
+type Region struct {
+	Area []RegionArea `xml:"Area"`
+}
+
+// RegionArea 动作区域分路径
+type RegionArea struct {
+	Start   string          `xml:"Start,attr"`
+	Command []RegionCommand `xml:"-"`
+}
+
+// RegionCommand 动作区域绘制指令
+type RegionCommand struct {
+	Type           string
+	Point1         string
+	Point2         string
+	Point3         string
+	EllipseSize    string
+	RotationAngle  string
+	LargeArc       string
+	SweepDirection string
+	EndPoint       string
+}
+
+// UnmarshalXML 解析跳转目标
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (dest *Dest) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var value struct {
+		Left   *float64 `xml:"Left"`
+		Right  *float64 `xml:"Right"`
+		Top    *float64 `xml:"Top"`
+		Bottom *float64 `xml:"Bottom"`
+		Zoom   *float64 `xml:"Zoom"`
+	}
+	dest.Type = attrValue(start, "Type")
+	dest.PageID = attrValue(start, "PageID")
+	dest.Left = actionFloatAttr(start, "Left")
+	dest.Right = actionFloatAttr(start, "Right")
+	dest.Top = actionFloatAttr(start, "Top")
+	dest.Bottom = actionFloatAttr(start, "Bottom")
+	dest.Zoom = actionFloatAttr(start, "Zoom")
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	if value.Left != nil {
+		dest.Left = *value.Left
+	}
+	if value.Right != nil {
+		dest.Right = *value.Right
+	}
+	if value.Top != nil {
+		dest.Top = *value.Top
+	}
+	if value.Bottom != nil {
+		dest.Bottom = *value.Bottom
+	}
+	if value.Zoom != nil {
+		dest.Zoom = *value.Zoom
+	}
+	return nil
+}
+
+// UnmarshalXML 解析视频动作并应用默认值
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (m *Movie) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type movie Movie
+	value := movie{Operator: "Play"}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*m = Movie(value)
+	return nil
+}
+
+// UnmarshalXML 解析动作区域分路径并保留指令顺序
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (a *RegionArea) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	*a = RegionArea{Start: attrValue(start, "Start")}
+	for {
+		tok, err := d.Token()
+		if err != nil {
+			return err
+		}
+		switch node := tok.(type) {
+		case xml.StartElement:
+			command := RegionCommand{
+				Type:           node.Name.Local,
+				Point1:         attrValue(node, "Point1"),
+				Point2:         attrValue(node, "Point2"),
+				Point3:         attrValue(node, "Point3"),
+				EllipseSize:    attrValue(node, "EllipseSize"),
+				RotationAngle:  attrValue(node, "RotationAngle"),
+				LargeArc:       attrValue(node, "LargeArc"),
+				SweepDirection: attrValue(node, "SweepDirection"),
+				EndPoint:       attrValue(node, "EndPoint"),
+			}
+			a.Command = append(a.Command, command)
+			if err := d.Skip(); err != nil {
+				return err
+			}
+		case xml.EndElement:
+			if node.Name.Local == start.Name.Local {
+				return nil
+			}
+		}
+	}
+}
+
+// actionFloatAttr 获取动作浮点属性
+// 入参: start 起始节点, name 属性名
+// 返回: float64 属性值
+func actionFloatAttr(start xml.StartElement, name string) float64 {
+	value, _ := strconv.ParseFloat(attrValue(start, name), 64)
+	return value
+}
@@ -23,14 +23,19 @@ type Document struct {
 	Pages       Pages       `xml:"Pages"`
 	Outlines    Outlines    `xml:"Outlines"`
 	Permissions Permissions `xml:"Permissions"`
+	Actions     []Action    `xml:"Actions>Action"`
+	Bookmarks   Bookmarks   `xml:"Bookmarks"`
 	Annotations string      `xml:"Annotations"`
 	Signatures  string      `xml:"Signatures"`
 	Attachments Attachments `xml:"Attachments"`
+	CustomTags  CustomTags  `xml:"CustomTags"`
 	Extensions  Extensions  `xml:"Extensions"`
 }

 // Extensions 扩展集合
 type Extensions struct {
+	XMLName   xml.Name    `xml:"Extensions"`
+	Path      string      `xml:",chardata"`
 	Extension []Extension `xml:"Extension"`
 }

@@ -42,7 +47,8 @@ type Extension struct {
 	Date       string          `xml:"Date,attr"`
 	RefID      string          `xml:"RefId,attr"`
 	Property   []Property      `xml:"Property"`
-	Data       string     `xml:"Data"`
+	ExtendData []string        `xml:"ExtendData"`
+	Data       []ExtensionData `xml:"Data"`
 }

 // Property 扩展属性
@@ -52,16 +58,45 @@ type Property struct {
 	Type  string `xml:"Type,attr"`
 }

+// ExtensionData 扩展数据
+type ExtensionData struct {
+	Attr    []xml.Attr `xml:",any,attr"`
+	Content string     `xml:",innerxml"`
+}
+
 // Attachments 附件集合
 type Attachments struct {
+	XMLName    xml.Name     `xml:"Attachments"`
+	Path       string       `xml:",chardata"`
 	Attachment []Attachment `xml:"Attachment"`
 }

 // Attachment 附件信息
 type Attachment struct {
-	Name string `xml:"Name,attr"`
-	File string `xml:"File,attr"`
 	ID           string   `xml:"ID,attr"`
+	Name         string   `xml:"Name,attr"`
+	Format       string   `xml:"Format,attr"`
+	CreationDate string   `xml:"CreationDate,attr"`
+	ModDate      string   `xml:"ModDate,attr"`
+	Size         *float64 `xml:"Size,attr"`
+	Visible      bool     `xml:"Visible,attr"`
+	Usage        string   `xml:"Usage,attr"`
+	FileLoc      string   `xml:"FileLoc"`
+}
+
+// CustomTags 自定义标引集合
+type CustomTags struct {
+	XMLName   xml.Name    `xml:"CustomTags"`
+	Path      string      `xml:",chardata"`
+	CustomTag []CustomTag `xml:"CustomTag"`
+}
+
+// CustomTag 自定义标引
+type CustomTag struct {
+	TypeID    string `xml:"TypeID,attr"`
+	NameSpace string `xml:"NameSpace,attr"`
+	SchemaLoc string `xml:"SchemaLoc"`
+	FileLoc   string `xml:"FileLoc"`
 }

 // CommonData 文档公共数据
@@ -101,6 +136,17 @@ type TemplatePage struct {
 	ZOrder  string `xml:"ZOrder,attr"`
 }

+// Bookmarks 书签集合
+type Bookmarks struct {
+	Bookmark []Bookmark `xml:"Bookmark"`
+}
+
+// Bookmark 书签
+type Bookmark struct {
+	Name string `xml:"Name,attr"`
+	Dest Dest   `xml:"Dest"`
+}
+
 // Outlines 大纲集合
 type Outlines struct {
 	OutlineElem []OutlineElem `xml:"OutlineElem"`
@@ -110,13 +156,146 @@ type Outlines struct {
 type OutlineElem struct {
 	Title       string        `xml:"Title,attr"`
 	Count       int           `xml:"Count,attr"`
-	Actions string `xml:"Actions"`
+	Expanded    bool          `xml:"Expanded,attr"`
+	Actions     []Action      `xml:"Actions>Action"`
+	OutlineElem []OutlineElem `xml:"OutlineElem"`
 }

 // Permissions 权限声明
 type Permissions struct {
 	Edit          bool         `xml:"Edit"`
-	Print  bool `xml:"Print"`
+	Annot         bool         `xml:"Annot"`
 	Export        bool         `xml:"Export"`
-	Copy   bool `xml:"Copy"`
+	Signature     bool         `xml:"Signature"`
+	Watermark     bool         `xml:"Watermark"`
+	PrintScreen   bool         `xml:"PrintScreen"`
+	Print         bool         `xml:"-"`
+	Copies        int          `xml:"-"`
+	Copy          bool         `xml:"CopyText"`
+	ContentRegist bool         `xml:"ContentRegist"`
+	ValidPeriod   *ValidPeriod `xml:"ValidPeriod"`
+}
+
+// ValidPeriod 文档访问有效期
+type ValidPeriod struct {
+	StartDate string `xml:"StartDate,attr"`
+	EndDate   string `xml:"EndDate,attr"`
+}
+
+// UnmarshalXML 解析文档并应用权限默认值
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (doc *Document) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type document Document
+	value := document{Permissions: defaultPermissions()}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*doc = Document(value)
+	return nil
+}
+
+// UnmarshalXML 解析附件并应用默认值
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (a *Attachment) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type attachment Attachment
+	value := attachment{Visible: true, Usage: "none"}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*a = Attachment(value)
+	return nil
+}
+
+// UnmarshalXML 解析大纲节点并应用默认值
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (o *OutlineElem) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	type outlineElem OutlineElem
+	value := outlineElem{Expanded: true}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*o = OutlineElem(value)
+	return nil
+}
+
+// UnmarshalXML 解析文档权限并应用默认值
+// 入参: d XML解码器, start 起始节点
+// 返回: error 错误信息
+func (p *Permissions) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var value struct {
+		Edit          *bool        `xml:"Edit"`
+		Annot         *bool        `xml:"Annot"`
+		Export        *bool        `xml:"Export"`
+		Signature     *bool        `xml:"Signature"`
+		Watermark     *bool        `xml:"Watermark"`
+		PrintScreen   *bool        `xml:"PrintScreen"`
+		Copy          *bool        `xml:"CopyText"`
+		ContentRegist *bool        `xml:"ContentRegist"`
+		Print         *print       `xml:"Print"`
+		ValidPeriod   *ValidPeriod `xml:"ValidPeriod"`
+	}
+	if err := d.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*p = defaultPermissions()
+	if value.Edit != nil {
+		p.Edit = *value.Edit
+	}
+	if value.Annot != nil {
+		p.Annot = *value.Annot
+	}
+	if value.Export != nil {
+		p.Export = *value.Export
+	}
+	if value.Signature != nil {
+		p.Signature = *value.Signature
+	}
+	if value.Watermark != nil {
+		p.Watermark = *value.Watermark
+	}
+	if value.PrintScreen != nil {
+		p.PrintScreen = *value.PrintScreen
+	}
+	if value.Copy != nil {
+		p.Copy = *value.Copy
+	}
+	if value.ContentRegist != nil {
+		p.ContentRegist = *value.ContentRegist
+	}
+	if value.Print != nil {
+		if value.Print.Printable != nil {
+			p.Print = *value.Print.Printable
+		}
+		if value.Print.Copies != nil {
+			p.Copies = *value.Print.Copies
+		}
+	}
+	p.ValidPeriod = value.ValidPeriod
+	return nil
+}
+
+// print 打印权限节点
+type print struct {
+	Printable *bool `xml:"Printable,attr"`
+	Copies    *int  `xml:"Copies,attr"`
+}
+
+// defaultPermissions 获取默认文档权限
+// 返回: Permissions 文档权限
+func defaultPermissions() Permissions {
+	return Permissions{
+		Edit:          true,
+		Annot:         true,
+		Export:        true,
+		Signature:     true,
+		Watermark:     true,
+		PrintScreen:   true,
+		Print:         true,
+		Copies:        -1,
+		Copy:          true,
+		ContentRegist: true,
+	}
 }
@@ -34,6 +34,7 @@ type FontFile struct {
 type FontFS struct {
 	files      map[string][]byte
 	names      []string
+	candidates []fontFileCandidate
 }

 // NewFontFS 创建内存字体文件系统
@@ -54,6 +55,7 @@ func NewFontFS(fonts []FontFile) *FontFS {
 		fsys.files[name] = append([]byte(nil), font.Data...)
 	}
 	sort.Strings(fsys.names)
+	fsys.candidates = fontFileCandidates(fsys.names, path.Base)
 	return fsys
 }

@@ -70,18 +72,20 @@ func (fsys *FontFS) Len() int {
 // 入参: name 字体文件名
 // 返回: fs.File 字体文件, error 错误信息
 func (fsys *FontFS) Open(name string) (fs.File, error) {
-	name = cleanFontName(name)
+	if !fs.ValidPath(name) {
+		return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrInvalid}
+	}
 	if name == "." {
 		return &fontDir{entries: fsys.entries()}, nil
 	}
-	data, ok := fsys.files[name]
+	data, ok := fsys.files[strings.ToLower(name)]
 	if !ok {
-		return nil, fs.ErrNotExist
+		return nil, &fs.PathError{Op: "open", Path: name, Err: fs.ErrNotExist}
 	}
 	return &fontMemFile{
 		Reader: bytes.NewReader(data),
 		info: fontFileInfo{
-			name: name,
+			name: strings.ToLower(name),
 			size: int64(len(data)),
 		},
 	}, nil
@@ -91,9 +95,15 @@ func (fsys *FontFS) Open(name string) (fs.File, error) {
 // 入参: name 目录名
 // 返回: []fs.DirEntry 目录条目, error 错误信息
 func (fsys *FontFS) ReadDir(name string) ([]fs.DirEntry, error) {
-	name = cleanFontName(name)
+	if !fs.ValidPath(name) {
+		return nil, &fs.PathError{Op: "readdir", Path: name, Err: fs.ErrInvalid}
+	}
 	if name != "." {
-		return nil, fs.ErrNotExist
+		err := fs.ErrNotExist
+		if _, ok := fsys.files[strings.ToLower(name)]; ok {
+			err = fs.ErrInvalid
+		}
+		return nil, &fs.PathError{Op: "readdir", Path: name, Err: err}
 	}
 	return fsys.entries(), nil
 }
@@ -102,21 +112,23 @@ func (fsys *FontFS) ReadDir(name string) ([]fs.DirEntry, error) {
 // 入参: pattern 匹配模式
 // 返回: []string 字体文件列表, error 错误信息
 func (fsys *FontFS) Glob(pattern string) ([]string, error) {
-	if _, err := path.Match(pattern, ""); err != nil {
-		return nil, err
-	}
-	return fsys.match(pattern), nil
+	return fs.Glob(struct{ fs.FS }{fsys}, pattern)
 }

 // Match 匹配指定字体名称
 // 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 _, pattern := range fontFilePatterns(names...) {
-		if matches := fsys.match(pattern); len(matches) > 0 {
+	return fsys.MatchStyle(false, false, names...)
+}
+
+// MatchStyle 匹配指定样式的字体名称
+// 入参: bold 是否粗体, italic 是否斜体, 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) MatchStyle(bold, italic bool, names ...string) (string, bool) {
+	if matches := fsys.matchPatternsStyle(fontFilePatterns(names...), bold, italic); len(matches) > 0 {
 		return matches[0], true
 	}
-	}
 	if matches := fsys.fallbackFonts(); len(matches) > 0 {
 		return matches[0], false
 	}
@@ -127,17 +139,30 @@ 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 {
-	buckets := make([][]string, fontMatchFuzzy+1)
-	for _, name := range fsys.names {
-		if rank := matchFontPatternRank(pattern, name); rank != fontMatchNone {
-			buckets[rank] = append(buckets[rank], name)
+	return fsys.matchStyle(pattern, false, false)
+}
+
+// matchStyle 匹配指定样式的字体文件模式
+// 入参: pattern 匹配模式, bold 是否粗体, italic 是否斜体
+// 返回: []string 字体文件列表
+func (fsys *FontFS) matchStyle(pattern string, bold, italic bool) []string {
+	return fsys.matchPatternsStyle([]string{pattern}, bold, italic)
+}
+
+// matchPatternsStyle 匹配指定样式的字体文件模式
+// 入参: patterns 匹配模式列表, bold 是否粗体, italic 是否斜体
+// 返回: []string 字体文件列表
+func (fsys *FontFS) matchPatternsStyle(patterns []string, bold, italic bool) []string {
+	matches := make([]fontFileMatch, 0, len(fsys.candidates))
+	seen := make(map[string]int, len(fsys.candidates))
+	for _, matcher := range newFontPatternMatchers(patterns) {
+		for _, file := range fsys.candidates {
+			rank := matcher.rankCandidate(file)
+			appendFontFileMatch(&matches, seen, matcher, file, rank, bold, italic)
 		}
 	}
-	var matches []string
-	for rank := fontMatchExact; rank <= fontMatchFuzzy; rank++ {
-		matches = append(matches, buckets[rank]...)
-	}
-	return matches
+	sortFontFileMatches(matches)
+	return fontFileMatchNames(matches)
 }

 // fallbackFonts 获取回退字体文件
@@ -183,51 +208,278 @@ func cleanFontName(name string) string {
 	return strings.ToLower(name)
 }

-// matchFontPatternRank 获取字体文件匹配等级
-// 入参: pattern 匹配模式, name 字体文件名
+type fontFileCandidate struct {
+	name       string
+	base       string
+	lowerBase  string
+	normalized string
+	fold       string
+}
+
+// fontFileCandidates 筛选字体文件候选
+// 入参: names 文件名列表, base 文件名提取函数
+// 返回: []fontFileCandidate 字体文件候选列表
+func fontFileCandidates(names []string, base func(string) string) []fontFileCandidate {
+	files := make([]fontFileCandidate, 0, len(names))
+	for _, name := range names {
+		if isFontFileName(name) {
+			baseName := base(name)
+			files = append(files, fontFileCandidate{
+				name:       name,
+				base:       baseName,
+				lowerBase:  strings.ToLower(baseName),
+				normalized: fontNormalizeName(baseName),
+				fold:       strings.ToLower(name),
+			})
+		}
+	}
+	return files
+}
+
+type fontPatternMatcher struct {
+	pattern      string
+	lowerPattern string
+	stem         string
+	aliases      []string
+	priority     int
+}
+
+// newFontPatternMatcher 创建字体文件匹配器
+// 入参: pattern 匹配模式
+// 返回: fontPatternMatcher 字体文件匹配器
+func newFontPatternMatcher(pattern string) fontPatternMatcher {
+	matcher := fontPatternMatcher{
+		pattern:      pattern,
+		lowerPattern: strings.ToLower(pattern),
+		stem:         fontPatternStem(pattern),
+	}
+	if matcher.stem != "" {
+		for _, alias := range fontExactCandidateNames(matcher.stem) {
+			alias = fontNormalizeName(alias)
+			if alias != "" {
+				matcher.aliases = append(matcher.aliases, alias)
+			}
+		}
+	}
+	return matcher
+}
+
+// newFontPatternMatchers 创建字体文件匹配器列表
+// 入参: patterns 匹配模式列表
+// 返回: []fontPatternMatcher 字体文件匹配器列表
+func newFontPatternMatchers(patterns []string) []fontPatternMatcher {
+	matchers := make([]fontPatternMatcher, 0, len(patterns))
+	for priority, pattern := range patterns {
+		matcher := newFontPatternMatcher(pattern)
+		matcher.priority = priority
+		matchers = append(matchers, matcher)
+	}
+	return matchers
+}
+
+// rank 获取字体文件匹配等级
+// 入参: name 字体文件名
 // 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 == "" {
+func (m fontPatternMatcher) rank(name string) int {
+	return m.rankCandidate(fontFileCandidate{
+		base:       name,
+		lowerBase:  strings.ToLower(name),
+		normalized: fontNormalizeName(name),
+	})
+}
+
+// rankCandidate 获取字体文件候选匹配等级
+// 入参: file 字体文件候选
+// 返回: int 匹配等级
+func (m fontPatternMatcher) rankCandidate(file fontFileCandidate) int {
+	exactPath, _ := path.Match(m.pattern, file.base)
+	lowerPath, _ := path.Match(m.lowerPattern, file.lowerBase)
+	if m.stem == "" {
 		if exactPath || lowerPath {
 			return fontMatchFuzzy
 		}
 		return fontMatchNone
 	}
-	name = fontNormalizeName(name)
-	if name == stem {
+	name := file.normalized
+	if name == m.stem {
 		return fontMatchExact
 	}
-	aliases := fontExactCandidateNames(stem)
-	for _, alias := range aliases {
-		alias = fontNormalizeName(alias)
-		if alias != "" && name == alias {
+	for _, alias := range m.aliases {
+		if name == alias {
 			return fontMatchExact
 		}
 	}
-	if strings.HasPrefix(name, stem) {
+	if fontFileKnownStyleSuffix(m.styleSuffixNormalized(name)) {
+		return fontMatchExact
+	}
+	if strings.HasPrefix(name, m.stem) {
 		return fontMatchPartial
 	}
-	for _, alias := range aliases {
-		alias = fontNormalizeName(alias)
-		if alias != "" && strings.HasPrefix(name, alias) {
+	for _, alias := range m.aliases {
+		if strings.HasPrefix(name, alias) {
 			return fontMatchPartial
 		}
 	}
-	if exactPath || lowerPath || strings.Contains(name, stem) {
+	if exactPath || lowerPath || strings.Contains(name, m.stem) {
 		return fontMatchFuzzy
 	}
-	for _, alias := range aliases {
-		alias = fontNormalizeName(alias)
-		if alias != "" && strings.Contains(name, alias) {
+	for _, alias := range m.aliases {
+		if strings.Contains(name, alias) {
 			return fontMatchFuzzy
 		}
 	}
 	return fontMatchNone
 }

+// styleSuffixNormalized 获取规范字体名称的样式后缀
+// 入参: name 规范字体名称
+// 返回: string 样式后缀
+func (m fontPatternMatcher) styleSuffixNormalized(name string) string {
+	if m.stem == "" || name == "" {
+		return ""
+	}
+	if strings.HasPrefix(name, m.stem) {
+		return strings.TrimPrefix(name, m.stem)
+	}
+	for _, alias := range m.aliases {
+		if strings.HasPrefix(name, alias) {
+			return strings.TrimPrefix(name, alias)
+		}
+	}
+	return ""
+}
+
+type fontFileMatch struct {
+	name      string
+	priority  int
+	rank      int
+	styleRank int
+	sortName  string
+}
+
+// appendFontFileMatch 追加字体文件匹配结果
+// 入参: matches 匹配结果, seen 已匹配文件, matcher 匹配器, file 字体文件候选, rank 匹配等级, bold 是否粗体, italic 是否斜体
+func appendFontFileMatch(matches *[]fontFileMatch, seen map[string]int, matcher fontPatternMatcher, file fontFileCandidate, rank int, bold, italic bool) {
+	if rank == fontMatchNone {
+		return
+	}
+	next := fontFileMatch{
+		name:      file.name,
+		priority:  matcher.priority,
+		rank:      rank,
+		styleRank: fontFileStyleRank(matcher.styleSuffixNormalized(file.normalized), bold, italic),
+		sortName:  file.lowerBase,
+	}
+	if index, ok := seen[file.fold]; ok {
+		if fontFileMatchLess(next, (*matches)[index]) {
+			(*matches)[index] = next
+		}
+		return
+	}
+	seen[file.fold] = len(*matches)
+	*matches = append(*matches, next)
+}
+
+// sortFontFileMatches 排序字体文件匹配结果
+// 入参: matches 匹配结果
+func sortFontFileMatches(matches []fontFileMatch) {
+	sort.SliceStable(matches, func(i, j int) bool {
+		return fontFileMatchLess(matches[i], matches[j])
+	})
+}
+
+// fontFileMatchLess 判断字体文件匹配结果优先级
+// 入参: left 左侧匹配结果, right 右侧匹配结果
+// 返回: bool 左侧是否优先
+func fontFileMatchLess(left, right fontFileMatch) bool {
+	if left.priority != right.priority {
+		return left.priority < right.priority
+	}
+	if left.rank != right.rank {
+		return left.rank < right.rank
+	}
+	if left.styleRank != right.styleRank {
+		return left.styleRank < right.styleRank
+	}
+	return left.sortName < right.sortName
+}
+
+// fontFileMatchNames 获取字体文件匹配名称
+// 入参: matches 匹配结果
+// 返回: []string 字体文件列表
+func fontFileMatchNames(matches []fontFileMatch) []string {
+	names := make([]string, 0, len(matches))
+	for _, match := range matches {
+		names = append(names, match.name)
+	}
+	return names
+}
+
+// fontFileStyleRank 获取字体文件样式匹配等级
+// 入参: suffix 样式后缀, bold 是否粗体, italic 是否斜体
+// 返回: int 样式匹配等级
+func fontFileStyleRank(suffix string, bold, italic bool) int {
+	fileBold, fileItalic := fontFileStyleFromSuffix(suffix)
+	rank := 0
+	if fileBold != bold {
+		rank += 2
+	}
+	if fileItalic != italic {
+		rank += 2
+	}
+	if !bold && !italic && !fileBold && !fileItalic && suffix != "" && !fontFileRegularSuffix(suffix) {
+		rank++
+	}
+	return rank
+}
+
+// fontFileStyleFromSuffix 获取样式后缀对应的字体样式
+// 入参: suffix 样式后缀
+// 返回: bool 是否粗体, bool 是否斜体
+func fontFileStyleFromSuffix(suffix string) (bool, bool) {
+	bold := suffix == "b" ||
+		suffix == "bd" ||
+		suffix == "bold" ||
+		suffix == "bi" ||
+		suffix == "bolditalic" ||
+		suffix == "boldoblique"
+	italic := suffix == "i" ||
+		suffix == "it" ||
+		suffix == "italic" ||
+		suffix == "oblique" ||
+		suffix == "bi" ||
+		suffix == "bolditalic" ||
+		suffix == "boldoblique"
+	return bold, italic
+}
+
+// fontFileRegularSuffix 判断是否为常规样式后缀
+// 入参: suffix 样式后缀
+// 返回: bool 是否为常规样式后缀
+func fontFileRegularSuffix(suffix string) bool {
+	switch suffix {
+	case "r", "regular", "normal", "常规":
+		return true
+	default:
+		return false
+	}
+}
+
+// fontFileKnownStyleSuffix 判断是否为已知样式后缀
+// 入参: suffix 样式后缀
+// 返回: bool 是否为已知样式后缀
+func fontFileKnownStyleSuffix(suffix string) bool {
+	switch suffix {
+	case "r", "regular", "normal", "常规",
+		"b", "bd", "bold",
+		"i", "it", "italic", "oblique",
+		"bi", "bolditalic", "boldoblique":
+		return true
+	default:
+		return false
+	}
+}
+
 // fontMemFile 内存字体文件
 type fontMemFile struct {
 	*bytes.Reader
@@ -275,6 +527,9 @@ func (d *fontDir) Close() error {
 // 返回: []fs.DirEntry 目录条目, error 错误信息
 func (d *fontDir) ReadDir(count int) ([]fs.DirEntry, error) {
 	if d.offset >= len(d.entries) {
+		if count <= 0 {
+			return nil, nil
+		}
 		return nil, io.EOF
 	}
 	if count <= 0 || d.offset+count > len(d.entries) {
@@ -22,13 +22,13 @@ import (
 )

 const (
-	// FontStatusEmbedded 字体使用OFD内嵌字体
+	// FontStatusEmbedded 内嵌字体可用
 	FontStatusEmbedded = "embedded"
-	// FontStatusMatched 字体命中外部字体
+	// FontStatusMatched 外部字体匹配
 	FontStatusMatched = "matched"
-	// FontStatusFallback 字体使用外部字体回退
+	// FontStatusFallback 外部字体回退
 	FontStatusFallback = "fallback"
-	// FontStatusMissing 字体缺失
+	// FontStatusMissing 字体资源缺失
 	FontStatusMissing = "missing"
 )

@@ -67,6 +67,30 @@ func (r *Reader) Fonts() ([]Font, error) {
 // FontInfos 获取OFD字体诊断信息
 // 返回: []FontInfo 字体诊断列表, error 错误信息
 func (r *Renderer) FontInfos() ([]FontInfo, error) {
+	doc, err := r.fontInfoDocument()
+	if err != nil {
+		return nil, err
+	}
+	return r.fontInfos(doc, nil)
+}
+
+// FontInfosFromPages 从页面内容获取OFD字体诊断信息
+// 入参: pages 页面内容列表
+// 返回: []FontInfo 字体诊断列表, error 错误信息
+func (r *Renderer) FontInfosFromPages(pages []*PageContent) ([]FontInfo, error) {
+	doc, err := r.fontInfoDocument()
+	if err != nil {
+		return nil, err
+	}
+	if pages == nil {
+		pages = []*PageContent{}
+	}
+	return r.fontInfos(doc, pages)
+}
+
+// fontInfoDocument 获取字体诊断文档结构
+// 返回: *Document 文档结构, error 错误信息
+func (r *Renderer) fontInfoDocument() (*Document, error) {
 	if r == nil || r.Reader == nil {
 		return nil, fmt.Errorf("ofd renderer is not initialized")
 	}
@@ -77,11 +101,18 @@ func (r *Renderer) FontInfos() ([]FontInfo, error) {
 	if doc == nil {
 		return nil, fmt.Errorf("ofd document is not opened")
 	}
+	return doc, nil
+}
+
+// fontInfos 获取OFD字体诊断信息
+// 入参: doc 文档结构, pages 页面内容列表
+// 返回: []FontInfo 字体诊断列表, error 错误信息
+func (r *Renderer) fontInfos(doc *Document, pages []*PageContent) ([]FontInfo, error) {
 	fonts, err := r.Reader.Fonts()
 	if err != nil {
 		return nil, err
 	}
-	usage := r.fontUsage(doc)
+	usage := r.fontUsage(doc, pages)
 	infos := make([]FontInfo, 0, len(fonts)+len(usage))
 	seen := make(map[string]bool)
 	for _, font := range fonts {
@@ -98,7 +129,7 @@ func (r *Renderer) FontInfos() ([]FontInfo, error) {
 			ID:       id,
 			FontName: id,
 			Status:   FontStatusMissing,
-			Detail:   "未在OFD资源中声明",
+			Detail:   "字体资源未被声明",
 			Used:     used,
 		})
 	}
@@ -130,16 +161,16 @@ func (r *Renderer) fontInfo(font Font) FontInfo {
 		if _, err := r.Reader.ResData(font.FontFile); err == nil {
 			info.Status = FontStatusEmbedded
 			info.Matched = path.Base(font.FontFile)
-			info.Detail = "使用OFD内嵌字体"
+			info.Detail = "使用内嵌字体文件"
 		} else {
 			info.Status = FontStatusMissing
 			info.Detail = "内嵌字体文件缺失"
 		}
 		return info
 	}
-	if matched, exact := r.matchFont(font.FontName, font.FamilyName); matched != "" {
-		info.Matched = matched
-		if exact {
+	if source, ok := r.fontSourceMatch(font.ID, &font); ok {
+		info.Matched = source.name
+		if source.exact {
 			info.Status = FontStatusMatched
 			info.Detail = "使用外部字体文件"
 		} else {
@@ -149,119 +180,50 @@ func (r *Renderer) fontInfo(font Font) FontInfo {
 		return info
 	}
 	info.Status = FontStatusMissing
-	info.Detail = "未找到可用字体"
+	info.Detail = "可用字体文件缺失"
 	return info
 }

-// matchFont 匹配外部字体
-// 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)
-		}); ok {
-			if matched, exact := matcher.Match(names...); matched != "" {
-				return matched, exact
-			}
-			continue
-		}
-		if matched := matchFontFS(fsys, names...); matched != "" {
-			return matched, true
-		}
-	}
-	if !canLoadSystemFonts() {
-		for _, fsys := range r.fontFS {
-			if matched := fallbackFontFS(fsys); matched != "" {
-				return matched, false
-			}
-		}
-	}
-	return "", false
-}
-
-// matchFontFS 从字体文件系统匹配字体
-// 入参: fsys 字体文件系统, names 字体名称列表
-// 返回: string 匹配字体文件
-func matchFontFS(fsys fs.FS, names ...string) string {
-	for _, pattern := range fontFilePatterns(names...) {
-		if matches := fontFSMatches(fsys, pattern); len(matches) > 0 {
-			return matches[0]
-		}
-	}
-	return ""
-}
-
-// fallbackFontFS 从字体文件系统获取回退字体
-// 入参: fsys 字体文件系统
-// 返回: string 回退字体文件
-func fallbackFontFS(fsys fs.FS) string {
-	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
+// fontFSMatchesStyle 匹配字体文件系统中的指定样式字体文件
+// 入参: fsys 字体文件系统, patterns 匹配模式列表, bold 是否粗体, italic 是否斜体
 // 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
+func fontFSMatchesStyle(fsys fs.FS, patterns []string, bold, italic bool) []string {
+	names, _ := fs.Glob(fsys, "*")
+	candidates := fontFileCandidates(names, path.Base)
+	matches := make([]fontFileMatch, 0, len(candidates))
+	seen := make(map[string]int, len(candidates))
+	for _, matcher := range newFontPatternMatchers(patterns) {
+		for _, file := range candidates {
+			rank := matcher.rankCandidate(file)
+			appendFontFileMatch(&matches, seen, matcher, file, rank, bold, italic)
 		}
-		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
+	sortFontFileMatches(matches)
+	return fontFileMatchNames(matches)
 }

 // fontUsage 统计文档字体使用次数
-// 入参: doc 文档结构
+// 入参: doc 文档结构, pages 页面内容列表, nil表示读取文档页面
 // 返回: map[string]int 字体使用次数
-func (r *Renderer) fontUsage(doc *Document) map[string]int {
+func (r *Renderer) fontUsage(doc *Document, pages []*PageContent) map[string]int {
 	usage := make(map[string]int)
+	if pages == nil {
 		for _, pageRef := range doc.Pages.Page {
-		page, err := r.Reader.PageContent(pageRef)
-		if err == nil {
+			if page, err := r.Reader.PageContent(pageRef); err == nil {
 				r.countPageFonts(page, usage)
 			}
 		}
+	} else {
+		for _, page := range pages {
+			if page != nil {
+				r.countPageFonts(page, usage)
+			}
+		}
+	}
 	for _, tpl := range doc.CommonData.TemplatePage {
 		page, err := r.Reader.PageContent(Page{BaseLoc: tpl.BaseLoc})
 		if err == nil {
+			r.templatePageCache[tpl.ID] = page
 			r.countPageFonts(page, usage)
 		}
 	}
@@ -336,35 +298,7 @@ func (r *Renderer) countCompositeFonts(cgu CompositeGraphicUnit, usage map[strin
 // countTextFont 统计文本字体使用次数
 // 入参: text 文本对象, usage 字体使用次数
 func (r *Renderer) countTextFont(text TextObject, usage map[string]int) {
-	fontID := text.Font
-	if fontID == "" && text.DrawParam != "" {
-		fontID = r.drawParamFont(text.DrawParam, nil)
-	}
-	if fontID != "" {
+	if fontID := r.textObjectFontID(text); fontID != "" {
 		usage[fontID]++
 	}
 }
-
-// drawParamFont 获取绘制参数字体
-// 入参: id 绘制参数ID, visited 已访问绘制参数
-// 返回: string 字体ID
-func (r *Renderer) drawParamFont(id string, visited map[string]bool) string {
-	if id == "" {
-		return ""
-	}
-	if visited == nil {
-		visited = make(map[string]bool)
-	}
-	if visited[id] {
-		return ""
-	}
-	visited[id] = true
-	dp := r.DrawParams[id]
-	if dp == nil {
-		return ""
-	}
-	if dp.Font != "" {
-		return dp.Font
-	}
-	return r.drawParamFont(dp.Relative, visited)
-}
@@ -0,0 +1,285 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"io/fs"
+	"path/filepath"
+	"runtime"
+
+	"github.com/tdewolff/canvas"
+)
+
+// fontSourceKind 字体来源类型
+type fontSourceKind uint8
+
+const (
+	fontSourceFile fontSourceKind = iota
+	fontSourceFS
+	fontSourceSystem
+)
+
+// fontSource 字体来源
+type fontSource struct {
+	kind  fontSourceKind
+	index int
+	name  string
+	exact bool
+}
+
+// fontSourceKey 字体来源去重键
+type fontSourceKey struct {
+	kind  fontSourceKind
+	index int
+	name  string
+}
+
+// fontCacheKey 字体加载缓存键
+type fontCacheKey struct {
+	fontSourceKey
+	style canvas.FontStyle
+}
+
+// loadFont 加载字体
+// 入参: fontID 字体ID
+// 返回: *canvas.FontFamily 字体族
+func (r *Renderer) loadFont(fontID string) *canvas.FontFamily {
+	if ff, ok := r.FontMap[fontID]; ok {
+		return ff
+	}
+	var defaultFont *canvas.FontFamily
+	if r.defaultFontLoaded {
+		defaultFont = r.fontFamily
+	}
+	of, ok := r.Reader.fontCache[fontID]
+	if !ok {
+		return defaultFont
+	}
+	fontStyle := canvasFontStyle(of)
+	ff := canvas.NewFontFamily(of.FontName)
+	if of.FontFile != "" {
+		if fontData, err := r.Reader.ResData(of.FontFile); err == nil {
+			if cidMap := getCFFCIDRuneMap(fontData); len(cidMap) > 0 {
+				if r.FontCIDMap == nil {
+					r.FontCIDMap = make(map[string]map[uint16]rune)
+				}
+				r.FontCIDMap[fontID] = cidMap
+			}
+			if _, fixedData, mapping, _, err := FixFontDataAggressive(fontData, true, true); err == nil {
+				fontData = fixedData
+				if mapping != nil {
+					if r.FontGIDMap == nil {
+						r.FontGIDMap = make(map[string]map[uint16]rune)
+					}
+					inv := make(map[uint16]rune)
+					for k, v := range mapping {
+						if k == packedGlyphRune(v) {
+							inv[v] = k
+						}
+					}
+					for k, v := range mapping {
+						if _, ok := inv[v]; !ok {
+							inv[v] = k
+						}
+					}
+					r.FontGIDMap[fontID] = inv
+				}
+			}
+			if err := ff.LoadFont(fontData, 0, fontStyle); err == nil {
+				r.FontMap[fontID] = ff
+				return ff
+			}
+			return nil
+		}
+		return nil
+	}
+	for _, source := range r.fontSources(fontID, of, fontStyle) {
+		if loaded := r.loadFontSource(ff, source, fontStyle); loaded != nil {
+			r.FontMap[fontID] = loaded
+			r.fontSourceUsed[fontID] = source
+			return loaded
+		}
+	}
+	r.FontMap[fontID] = defaultFont
+	return defaultFont
+}
+
+// canvasFontStyle 获取Canvas字体样式
+// 入参: font OFD字体定义
+// 返回: canvas.FontStyle Canvas字体样式
+func canvasFontStyle(font *Font) canvas.FontStyle {
+	var style canvas.FontStyle
+	if font.Bold {
+		style |= canvas.FontBold
+	}
+	if font.Italic {
+		style |= canvas.FontItalic
+	}
+	return style
+}
+
+// fontSources 获取字体来源列表
+// 入参: fontID 字体ID, font OFD字体定义, style Canvas字体样式
+// 返回: []fontSource 字体来源列表
+func (r *Renderer) fontSources(fontID string, font *Font, style canvas.FontStyle) []fontSource {
+	if sources, ok := r.fontSourceCache[fontID]; ok {
+		return sources
+	}
+	bold := style&canvas.FontBold != 0
+	italic := style&canvas.FontItalic != 0
+	patterns := fontFilePatterns(font.FontName, font.FamilyName)
+	sources := make([]fontSource, 0)
+	seen := make(map[fontSourceKey]bool)
+	for _, dir := range r.fontDirs {
+		for _, name := range r.matchFontFiles(dir, patterns, bold, italic) {
+			sources = appendFontSource(sources, seen, fontSource{kind: fontSourceFile, name: name, exact: true})
+		}
+	}
+	for index, fsys := range r.fontFS {
+		for _, name := range fontFSMatchesStyle(fsys, patterns, bold, italic) {
+			sources = appendFontSource(sources, seen, fontSource{kind: fontSourceFS, index: index, name: name, exact: true})
+		}
+	}
+	if !canLoadSystemFonts() {
+		for index, fsys := range r.fontFS {
+			names, _ := fs.Glob(fsys, "*")
+			for _, name := range names {
+				sources = appendFontSource(sources, seen, fontSource{kind: fontSourceFS, index: index, name: name})
+			}
+		}
+		r.fontSourceCache[fontID] = sources
+		return sources
+	}
+	systemDirs := systemFontDirs()
+	for _, name := range []string{font.FamilyName, font.FontName} {
+		for _, systemName := range fontSystemNames(name) {
+			systemPatterns := fontFilePatterns(systemName)
+			for _, dir := range systemDirs {
+				for _, match := range r.matchFontFiles(dir, systemPatterns, bold, italic) {
+					sources = appendFontSource(sources, seen, fontSource{kind: fontSourceFile, name: match, exact: true})
+				}
+			}
+			sources = appendFontSource(sources, seen, fontSource{kind: fontSourceSystem, name: systemName, exact: true})
+		}
+	}
+	r.fontSourceCache[fontID] = sources
+	return sources
+}
+
+// appendFontSource 追加字体来源
+// 入参: sources 字体来源列表, seen 去重映射, source 字体来源
+// 返回: []fontSource 字体来源列表
+func appendFontSource(sources []fontSource, seen map[fontSourceKey]bool, source fontSource) []fontSource {
+	if source.name == "" {
+		return sources
+	}
+	key := fontSourceKey{kind: source.kind, index: source.index, name: source.name}
+	if seen[key] {
+		return sources
+	}
+	seen[key] = true
+	return append(sources, source)
+}
+
+// fontSourceMatch 获取匹配的字体来源
+// 入参: fontID 字体ID, font OFD字体定义
+// 返回: fontSource 字体来源, bool 是否匹配
+func (r *Renderer) fontSourceMatch(fontID string, font *Font) (fontSource, bool) {
+	if source, ok := r.fontSourceUsed[fontID]; ok {
+		return source, true
+	}
+	style := canvasFontStyle(font)
+	for _, source := range r.fontSources(fontID, font, style) {
+		key := fontCacheKey{fontSourceKey: fontSourceKey{kind: source.kind, index: source.index, name: source.name}, style: style}
+		if cached, ok := r.fontCache[key]; ok {
+			if cached != nil {
+				return source, true
+			}
+			continue
+		}
+		family := canvas.NewFontFamily(font.FontName)
+		if r.loadFontSource(family, source, style) != nil {
+			return source, true
+		}
+	}
+	return fontSource{}, false
+}
+
+// loadFontSource 加载字体来源
+// 入参: family 字体族, source 字体来源, style Canvas字体样式
+// 返回: *canvas.FontFamily 字体族
+func (r *Renderer) loadFontSource(family *canvas.FontFamily, source fontSource, style canvas.FontStyle) *canvas.FontFamily {
+	key := fontCacheKey{fontSourceKey: fontSourceKey{kind: source.kind, index: source.index, name: source.name}, style: style}
+	if cached, ok := r.fontCache[key]; ok {
+		return cached
+	}
+	var err error
+	switch source.kind {
+	case fontSourceFile:
+		err = family.LoadFontFile(source.name, style)
+	case fontSourceFS:
+		var data []byte
+		data, err = fs.ReadFile(r.fontFS[source.index], source.name)
+		if err == nil {
+			err = family.LoadFont(data, 0, style)
+		}
+	case fontSourceSystem:
+		err = family.LoadSystemFont(source.name, style)
+	}
+	if err != nil {
+		r.fontCache[key] = nil
+		return nil
+	}
+	r.fontCache[key] = family
+	return family
+}
+
+// matchFontFiles 查找字体文件
+// 入参: dir 目录, patterns 模式列表, bold 是否粗体, italic 是否斜体
+// 返回: []string 文件列表
+func (r *Renderer) matchFontFiles(dir string, patterns []string, bold, italic bool) []string {
+	candidates, ok := r.fontDirCandidates[dir]
+	if !ok {
+		files, _ := filepath.Glob(filepath.Join(dir, "*"))
+		candidates = fontFileCandidates(files, filepath.Base)
+		r.fontDirCandidates[dir] = candidates
+	}
+	matches := make([]fontFileMatch, 0, len(candidates))
+	index := make(map[string]int, len(candidates))
+	for _, matcher := range newFontPatternMatchers(patterns) {
+		for _, file := range candidates {
+			rank := matcher.rankCandidate(file)
+			appendFontFileMatch(&matches, index, matcher, file, rank, bold, italic)
+		}
+	}
+	sortFontFileMatches(matches)
+	return fontFileMatchNames(matches)
+}
+
+// systemFontDirs 获取系统字体目录
+// 返回: []string 字体目录列表
+func systemFontDirs() []string {
+	switch runtime.GOOS {
+	case "android":
+		return []string{"/product/fonts", "/system/fonts"}
+	case "darwin":
+		return []string{`/Library/Fonts`}
+	case "linux":
+		return []string{`/usr/share/fonts`}
+	case "windows":
+		return []string{`C:\Windows\Fonts`}
+	}
+	return nil
+}
@@ -117,6 +117,8 @@ var fontFallbackFiles = []string{
 	"arial.ttf",
 }

+var fontNameReplacer = strings.NewReplacer(" ", "", "-", "", "_", "", "(", "", ")", "", "（", "", "）", "")
+
 // 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
@@ -149,10 +151,10 @@ func FontSystemNames(names ...string) []string {
 // 入参: name 字体名称
 // 返回: string 规范化后的字体名称
 func fontNormalizeName(name string) string {
+	name = strings.ReplaceAll(name, "\\", "/")
 	name = strings.TrimSuffix(path.Base(name), path.Ext(name))
 	name = strings.ToLower(strings.TrimSpace(name))
-	replacer := strings.NewReplacer(" ", "", "-", "", "_", "", "(", "", ")", "", "（", "", "）", "")
-	return replacer.Replace(name)
+	return fontNameReplacer.Replace(name)
 }

 // fontCandidateNames 获取字体候选名称
@@ -310,13 +312,6 @@ func isFontFileName(name string) bool {
 	}
 }

-// 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
@@ -325,39 +320,35 @@ func fontRuleMatchLevel(rule fontMatchRule, name string) int {
 	if name == "" {
 		return fontMatchNone
 	}
-	items := fontRuleNames(rule)
-	for _, item := range items {
+	level := fontMatchNone
+	match := func(item string) bool {
 		item = fontNormalizeName(item)
 		if item != "" && name == item {
-			return fontMatchExact
+			level = fontMatchExact
+			return true
+		}
+		if item != "" && (level == fontMatchNone || level > fontMatchPartial) && strings.HasPrefix(name, item) {
+			level = fontMatchPartial
+		}
+		if item != "" && level == fontMatchNone && strings.Contains(name, item) {
+			level = fontMatchFuzzy
+		}
+		return false
+	}
+	for _, item := range rule.Keys {
+		if match(item) {
+			return level
 		}
 	}
-	for _, item := range items {
-		item = fontNormalizeName(item)
-		if item != "" && (strings.HasPrefix(name, item) || strings.HasPrefix(item, name)) {
-			return fontMatchPartial
+	for _, item := range rule.Names {
+		if match(item) {
+			return level
 		}
 	}
-	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)
+		match(rule.System)
 	}
-	return result
+	return level
 }

 // appendFontName 追加字体名称
@@ -20,13 +20,6 @@ import (
 	"sort"
 )

-// align4 计算 4 字节对齐后的长度
-// 入参: n 原始长度
-// 返回: uint32 对齐后的长度
-func align4(n uint32) uint32 {
-	return (n + 3) & ^uint32(3)
-}
-
 // packedGlyphRune 获取包装字体字符
 // 入参: gid 字形ID
 // 返回: rune 包装字体字符
@@ -55,27 +48,6 @@ func calcTableChecksum(data []byte) uint32 {
 	return sum
 }

-// checkMissingCmap 检查是否缺失 cmap 表
-// 入参: data 字体数据
-// 返回: bool 是否缺失
-func checkMissingCmap(data []byte) bool {
-	if len(data) < 12 {
-		return true
-	}
-	numTables := binary.BigEndian.Uint16(data[4:6])
-	for i := 0; i < int(numTables); i++ {
-		pos := 12 + i*16
-		if len(data) < pos+4 {
-			break
-		}
-		tag := string(data[pos : pos+4])
-		if tag == "cmap" {
-			return false
-		}
-	}
-	return true
-}
-
 // parseCmapMappings 解析 cmap 字符映射
 // 入参: data cmap表数据
 // 返回: map[rune]uint16 字符到字形映射
@@ -287,13 +259,6 @@ func buildHheaTable(numGlyphs uint16) []byte {
 	return buf.Bytes()
 }

-// buildMaxpTable 构建 maxp 表
-// 入参: numGlyphs 字形数量
-// 返回: []byte maxp表数据
-func buildMaxpTable(numGlyphs uint16) []byte {
-	return buildCFFMaxpTable(numGlyphs)
-}
-
 // buildCFFMaxpTable 构建 CFF 轮廓使用的 maxp 0.5 表
 // 入参: numGlyphs 字形数量
 // 返回: []byte maxp表数据
@@ -15,6 +15,7 @@
 package ofdgo

 import (
+	"fmt"
 	"math"
 	"strconv"
 	"strings"
@@ -30,14 +31,18 @@ type Box struct {
 // 返回: Box 矩形对象, error 错误信息
 func ParseBox(s string) (Box, error) {
 	parts := strings.Fields(s)
-	if len(parts) < 4 {
-		return Box{}, nil
+	if len(parts) != 4 {
+		return Box{}, fmt.Errorf("invalid box: %s", s)
 	}
-	x, _ := strconv.ParseFloat(parts[0], 64)
-	y, _ := strconv.ParseFloat(parts[1], 64)
-	w, _ := strconv.ParseFloat(parts[2], 64)
-	h, _ := strconv.ParseFloat(parts[3], 64)
-	return Box{X: x, Y: y, W: w, H: h}, nil
+	var values [4]float64
+	for i, part := range parts {
+		value, err := strconv.ParseFloat(part, 64)
+		if err != nil {
+			return Box{}, fmt.Errorf("invalid box: %s", s)
+		}
+		values[i] = value
+	}
+	return Box{X: values[0], Y: values[1], W: values[2], H: values[3]}, nil
 }

 // Matrix 2D仿射变换矩阵
@@ -20,12 +20,28 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	_ "image/gif"
+
+	canvasimage "github.com/tdewolff/canvas/image"
+	_ "github.com/xiaoqidun/jbig2"
+	_ "golang.org/x/image/bmp"
+	_ "golang.org/x/image/tiff"
 )

 // decodeImageData 解码图片数据
 // 入参: data 图片数据
 // 返回: image.Image 图片对象, string 图片格式, error 错误信息
 func decodeImageData(data []byte) (image.Image, string, error) {
+	if isJPEGData(data) {
+		if img, err := canvasimage.NewJPEGImage(bytes.NewReader(data)); err == nil {
+			return img, "jpeg", nil
+		}
+	}
+	if isPNGData(data) {
+		if img, err := canvasimage.NewPNGImage(bytes.NewReader(data)); err == nil {
+			return img, "png", nil
+		}
+	}
 	img, format, err := image.Decode(bytes.NewReader(data))
 	if err == nil {
 		return img, normalizeSealType(format), nil
@@ -36,6 +52,20 @@ func decodeImageData(data []byte) (image.Image, string, error) {
 	return nil, "", err
 }

+// isJPEGData 判断是否为JPEG图片数据
+// 入参: data 图片数据
+// 返回: bool 是否为JPEG图片数据
+func isJPEGData(data []byte) bool {
+	return len(data) >= 2 && data[0] == 0xFF && data[1] == 0xD8
+}
+
+// isPNGData 判断是否为PNG图片数据
+// 入参: data 图片数据
+// 返回: bool 是否为PNG图片数据
+func isPNGData(data []byte) bool {
+	return bytes.HasPrefix(data, []byte("\x89PNG\r\n\x1a\n"))
+}
+
 // decodeImageConfigData 解码图片尺寸
 // 入参: data 图片数据
 // 返回: image.Config 图片尺寸, string 图片格式, error 错误信息
@@ -19,6 +19,76 @@ import (
 	"strconv"
 )

+// graphicObjectTarget 图形对象集合
+type graphicObjectTarget struct {
+	objects   *[]GraphicObject
+	text      *[]TextObject
+	path      *[]PathObject
+	image     *[]ImageObject
+	composite *[]CompositeGraphicUnit
+}
+
+// decodeGraphicObject 解析图形对象
+// 入参: d XML解码器, start 起始节点, target 图形对象集合
+// 返回: bool 是否为图形对象, error 错误信息
+func decodeGraphicObject(d *xml.Decoder, start xml.StartElement, target graphicObjectTarget) (bool, error) {
+	switch start.Name.Local {
+	case "TextObject":
+		var obj TextObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return true, err
+		}
+		*target.text = append(*target.text, obj)
+		*target.objects = append(*target.objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
+	case "PathObject":
+		var obj PathObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return true, err
+		}
+		*target.path = append(*target.path, obj)
+		*target.objects = append(*target.objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
+	case "ImageObject":
+		var obj ImageObject
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return true, err
+		}
+		*target.image = append(*target.image, obj)
+		*target.objects = append(*target.objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
+	case "CompositeGraphicUnit", "CompositeObject":
+		var obj CompositeGraphicUnit
+		if err := d.DecodeElement(&obj, &start); err != nil {
+			return true, err
+		}
+		*target.composite = append(*target.composite, obj)
+		*target.objects = append(*target.objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
+	default:
+		return false, nil
+	}
+	return true, nil
+}
+
+// decodeObjectContainer 解析图形对象容器
+// 入参: d XML解码器, start 起始节点, decode 对象解码函数
+// 返回: error 错误信息
+func decodeObjectContainer(d *xml.Decoder, start xml.StartElement, decode func(*xml.Decoder, xml.StartElement) error) error {
+	for {
+		tok, err := d.Token()
+		if err != nil {
+			return err
+		}
+		switch node := tok.(type) {
+		case xml.StartElement:
+			if err := decode(d, node); err != nil {
+				return err
+			}
+		case xml.EndElement:
+			if node.Name.Local == start.Name.Local {
+				return nil
+			}
+		}
+	}
+}
+
 // UnmarshalXML 解析图层并保留对象顺序
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
@@ -26,85 +96,27 @@ func (l *Layer) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	*l = Layer{}
 	l.ID = attrValue(start, "ID")
 	l.DrawParam = attrValue(start, "DrawParam")
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := l.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
+	return decodeObjectContainer(d, start, l.decodeObject)
 }

 // decodeObject 解析图层子对象
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (l *Layer) decodeObject(d *xml.Decoder, start xml.StartElement) error {
-	switch start.Name.Local {
-	case "TextObject":
-		var obj TextObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
+	target := graphicObjectTarget{
+		objects:   &l.Objects,
+		text:      &l.TextObject,
+		path:      &l.PathObject,
+		image:     &l.ImageObject,
+		composite: &l.CompositeGraphicUnit,
+	}
+	if decoded, err := decodeGraphicObject(d, start, target); decoded || err != nil {
 		return err
 	}
-		l.TextObject = append(l.TextObject, obj)
-		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
-	case "PathObject":
-		var obj PathObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
+	if start.Name.Local == "PageBlock" {
+		return decodeObjectContainer(d, start, l.decodeObject)
 	}
-		l.PathObject = append(l.PathObject, obj)
-		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
-	case "ImageObject":
-		var obj ImageObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		l.ImageObject = append(l.ImageObject, obj)
-		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
-	case "CompositeGraphicUnit", "CompositeObject":
-		var obj CompositeGraphicUnit
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		l.CompositeGraphicUnit = append(l.CompositeGraphicUnit, obj)
-		l.Objects = append(l.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
-	case "PageBlock":
-		return l.decodePageBlock(d, start)
-	default:
 	return d.Skip()
-	}
-	return nil
-}
-
-// decodePageBlock 解析页块子对象
-// 入参: d XML解码器, start 起始节点
-// 返回: error 错误信息
-func (l *Layer) decodePageBlock(d *xml.Decoder, start xml.StartElement) error {
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := l.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
 }

 // UnmarshalXML 解析复合图元并保留对象顺序
@@ -128,178 +140,73 @@ func (c *CompositeGraphicUnit) UnmarshalXML(d *xml.Decoder, start xml.StartEleme
 			c.Visible = &visible
 		}
 	}
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := c.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
+	return decodeObjectContainer(d, start, c.decodeObject)
 }

 // decodeObject 解析复合图元子对象
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (c *CompositeGraphicUnit) decodeObject(d *xml.Decoder, start xml.StartElement) error {
+	target := graphicObjectTarget{
+		objects:   &c.Objects,
+		text:      &c.TextObject,
+		path:      &c.PathObject,
+		image:     &c.ImageObject,
+		composite: &c.CompositeGraphicUnit,
+	}
+	if decoded, err := decodeGraphicObject(d, start, target); decoded || err != nil {
+		return err
+	}
 	switch start.Name.Local {
-	case "TextObject":
-		var obj TextObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		c.TextObject = append(c.TextObject, obj)
-		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
-	case "PathObject":
-		var obj PathObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		c.PathObject = append(c.PathObject, obj)
-		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
-	case "ImageObject":
-		var obj ImageObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		c.ImageObject = append(c.ImageObject, obj)
-		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
-	case "CompositeGraphicUnit", "CompositeObject":
-		var obj CompositeGraphicUnit
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		c.CompositeGraphicUnit = append(c.CompositeGraphicUnit, obj)
-		c.Objects = append(c.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
 	case "Clips":
 		var clips Clips
 		if err := d.DecodeElement(&clips, &start); err != nil {
 			return err
 		}
 		c.Clips = &clips
+	case "Actions":
+		var actions struct {
+			Action []Action `xml:"Action"`
+		}
+		if err := d.DecodeElement(&actions, &start); err != nil {
+			return err
+		}
+		c.Actions = actions.Action
 	case "Content", "PageBlock":
-		return c.decodePageBlock(d, start)
+		return decodeObjectContainer(d, start, c.decodeObject)
 	default:
 		return d.Skip()
 	}
 	return nil
 }

-// decodePageBlock 解析页块子对象
-// 入参: d XML解码器, start 起始节点
-// 返回: error 错误信息
-func (c *CompositeGraphicUnit) decodePageBlock(d *xml.Decoder, start xml.StartElement) error {
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := c.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
-}
-
 // UnmarshalXML 解析注释外观并保留对象顺序
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (a *Appearance) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	*a = Appearance{}
 	a.Boundary = attrValue(start, "Boundary")
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := a.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
+	return decodeObjectContainer(d, start, a.decodeObject)
 }

 // decodeObject 解析注释外观子对象
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (a *Appearance) decodeObject(d *xml.Decoder, start xml.StartElement) error {
-	switch start.Name.Local {
-	case "TextObject":
-		var obj TextObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
+	target := graphicObjectTarget{
+		objects:   &a.Objects,
+		text:      &a.TextObject,
+		path:      &a.PathObject,
+		image:     &a.ImageObject,
+		composite: &a.CompositeGraphicUnit,
+	}
+	if decoded, err := decodeGraphicObject(d, start, target); decoded || err != nil {
 		return err
 	}
-		a.TextObject = append(a.TextObject, obj)
-		a.Objects = append(a.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
-	case "PathObject":
-		var obj PathObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
+	if start.Name.Local == "PageBlock" {
+		return decodeObjectContainer(d, start, a.decodeObject)
 	}
-		a.PathObject = append(a.PathObject, obj)
-		a.Objects = append(a.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
-	case "ImageObject":
-		var obj ImageObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		a.ImageObject = append(a.ImageObject, obj)
-		a.Objects = append(a.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
-	case "CompositeGraphicUnit", "CompositeObject":
-		var obj CompositeGraphicUnit
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		a.CompositeGraphicUnit = append(a.CompositeGraphicUnit, obj)
-		a.Objects = append(a.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
-	case "PageBlock":
-		return a.decodePageBlock(d, start)
-	default:
 	return d.Skip()
-	}
-	return nil
-}
-
-// decodePageBlock 解析注释外观页块子对象
-// 入参: d XML解码器, start 起始节点
-// 返回: error 错误信息
-func (a *Appearance) decodePageBlock(d *xml.Decoder, start xml.StartElement) error {
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := a.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
 }

 // UnmarshalXML 解析图案单元内容并保留对象顺序
@@ -307,85 +214,27 @@ func (a *Appearance) decodePageBlock(d *xml.Decoder, start xml.StartElement) err
 // 返回: error 错误信息
 func (p *PatternContent) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 	*p = PatternContent{}
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := p.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
+	return decodeObjectContainer(d, start, p.decodeObject)
 }

 // decodeObject 解析图案单元内容子对象
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (p *PatternContent) decodeObject(d *xml.Decoder, start xml.StartElement) error {
-	switch start.Name.Local {
-	case "TextObject":
-		var obj TextObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
+	target := graphicObjectTarget{
+		objects:   &p.Objects,
+		text:      &p.TextObject,
+		path:      &p.PathObject,
+		image:     &p.ImageObject,
+		composite: &p.CompositeGraphicUnit,
+	}
+	if decoded, err := decodeGraphicObject(d, start, target); decoded || err != nil {
 		return err
 	}
-		p.TextObject = append(p.TextObject, obj)
-		p.Objects = append(p.Objects, GraphicObject{Type: start.Name.Local, TextObject: obj})
-	case "PathObject":
-		var obj PathObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
+	if start.Name.Local == "PageBlock" {
+		return decodeObjectContainer(d, start, p.decodeObject)
 	}
-		p.PathObject = append(p.PathObject, obj)
-		p.Objects = append(p.Objects, GraphicObject{Type: start.Name.Local, PathObject: obj})
-	case "ImageObject":
-		var obj ImageObject
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		p.ImageObject = append(p.ImageObject, obj)
-		p.Objects = append(p.Objects, GraphicObject{Type: start.Name.Local, ImageObject: obj})
-	case "CompositeGraphicUnit", "CompositeObject":
-		var obj CompositeGraphicUnit
-		if err := d.DecodeElement(&obj, &start); err != nil {
-			return err
-		}
-		p.CompositeGraphicUnit = append(p.CompositeGraphicUnit, obj)
-		p.Objects = append(p.Objects, GraphicObject{Type: start.Name.Local, CompositeGraphicUnit: obj})
-	case "PageBlock":
-		return p.decodePageBlock(d, start)
-	default:
 	return d.Skip()
-	}
-	return nil
-}
-
-// decodePageBlock 解析图案单元内容页块子对象
-// 入参: d XML解码器, start 起始节点
-// 返回: error 错误信息
-func (p *PatternContent) decodePageBlock(d *xml.Decoder, start xml.StartElement) error {
-	for {
-		tok, err := d.Token()
-		if err != nil {
-			return err
-		}
-		switch node := tok.(type) {
-		case xml.StartElement:
-			if err := p.decodeObject(d, node); err != nil {
-				return err
-			}
-		case xml.EndElement:
-			if node.Name.Local == start.Name.Local {
-				return nil
-			}
-		}
-	}
 }

 // attrValue 获取XML属性值
@@ -23,6 +23,7 @@ type PageContent struct {
 	Area     PageArea   `xml:"Area"`
 	Template []Template `xml:"Template"`
 	Content  Content    `xml:"Content"`
+	Actions  []Action   `xml:"Actions>Action"`
 }

 // Template 页面模板引用
@@ -58,7 +59,7 @@ type GraphicObject struct {

 // Clips 裁剪区域集合
 type Clips struct {
-	TransFlag bool   `xml:"TransFlag,attr"`
+	TransFlag *bool  `xml:"TransFlag,attr"`
 	Clip      []Clip `xml:"Clip"`
 }

@@ -97,6 +98,7 @@ type TextObject struct {
 	CGTransform []CGTransform `xml:"CGTransform"`
 	TextCode    []TextCode    `xml:"TextCode"`
 	Clips       *Clips        `xml:"Clips"`
+	Actions     []Action      `xml:"Actions>Action"`
 }

 // FillColor 填充颜色
@@ -165,6 +167,7 @@ type PathObject struct {
 	FillColor       *FillColor   `xml:"FillColor"`
 	AbbreviatedData string       `xml:"AbbreviatedData"`
 	Clips           *Clips       `xml:"Clips"`
+	Actions         []Action     `xml:"Actions>Action"`
 }

 // StrokeColor 勾边颜色
@@ -210,8 +213,10 @@ type ImageObject struct {
 	ID         string   `xml:"ID,attr"`
 	Boundary   string   `xml:"Boundary,attr"`
 	ResourceID string   `xml:"ResourceID,attr"`
+	ImageMask  string   `xml:"ImageMask,attr"`
 	CTM        string   `xml:"CTM,attr"`
 	Alpha      *int     `xml:"Alpha,attr"`
 	Visible    *bool    `xml:"Visible,attr"`
 	Clips      *Clips   `xml:"Clips"`
+	Actions    []Action `xml:"Actions>Action"`
 }
@@ -0,0 +1,330 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"image/color"
+	"strconv"
+	"strings"
+
+	"github.com/tdewolff/canvas"
+)
+
+// parseColorWithAlpha 解析带透明度的颜色
+// 入参: val 颜色值, alpha 透明度
+// 返回: color.Color 颜色对象
+func parseColorWithAlpha(val string, alpha *int) color.Color {
+	parts := strings.Fields(val)
+	if len(parts) >= 3 {
+		r := parseColorComponent(parts[0])
+		g := parseColorComponent(parts[1])
+		b := parseColorComponent(parts[2])
+		a := 255
+		if alpha != nil {
+			a = *alpha
+		}
+		a = clampColor(a)
+		return color.RGBA{
+			R: uint8(clampColor(r) * a / 255),
+			G: uint8(clampColor(g) * a / 255),
+			B: uint8(clampColor(b) * a / 255),
+			A: uint8(a),
+		}
+	}
+	return color.Black
+}
+
+// parseColorComponent 解析颜色分量
+// 入参: s 颜色分量
+// 返回: int 颜色分量值
+func parseColorComponent(s string) int {
+	s = strings.TrimSpace(s)
+	if strings.HasPrefix(s, "#") {
+		v, _ := strconv.ParseInt(strings.TrimPrefix(s, "#"), 16, 0)
+		return int(v)
+	}
+	v, _ := strconv.Atoi(s)
+	return v
+}
+
+// clampColor 限制颜色分量范围
+// 入参: v 颜色分量
+// 返回: int 颜色分量
+func clampColor(v int) int {
+	if v < 0 {
+		return 0
+	}
+	if v > 255 {
+		return 255
+	}
+	return v
+}
+
+// mergeAlpha 合并透明度
+// 入参: colorAlpha 颜色透明度, objectAlpha 对象透明度
+// 返回: *int 合并后的透明度
+func mergeAlpha(colorAlpha, objectAlpha *int) *int {
+	if colorAlpha == nil && objectAlpha == nil {
+		return nil
+	}
+	alpha := 255
+	if colorAlpha != nil {
+		alpha = *colorAlpha
+	}
+	if objectAlpha != nil {
+		alpha = alpha * *objectAlpha / 255
+	}
+	alpha = clampColor(alpha)
+	return &alpha
+}
+
+// withFillAlpha 合并填充色透明度
+// 入参: fillColor 填充颜色节点, alpha 对象透明度
+// 返回: *FillColor 合并后的填充颜色节点
+func withFillAlpha(fillColor *FillColor, alpha *int) *FillColor {
+	if fillColor == nil || alpha == nil {
+		return fillColor
+	}
+	merged := *fillColor
+	merged.Alpha = mergeAlpha(fillColor.Alpha, alpha)
+	return &merged
+}
+
+// withStrokeAlpha 合并勾边色透明度
+// 入参: strokeColor 勾边颜色节点, alpha 对象透明度
+// 返回: *StrokeColor 合并后的勾边颜色节点
+func withStrokeAlpha(strokeColor *StrokeColor, alpha *int) *StrokeColor {
+	if strokeColor == nil || alpha == nil {
+		return strokeColor
+	}
+	merged := *strokeColor
+	merged.Alpha = mergeAlpha(strokeColor.Alpha, alpha)
+	return &merged
+}
+
+// colorWithAlpha 合并颜色透明度
+// 入参: c 颜色对象, alpha 对象透明度
+// 返回: color.Color 合并后的颜色对象
+func colorWithAlpha(c color.Color, alpha *int) color.Color {
+	if c == nil || alpha == nil {
+		return c
+	}
+	a := clampColor(*alpha)
+	rgba := colorToRGBA(c)
+	return color.RGBA{
+		R: uint8(int(rgba.R) * a / 255),
+		G: uint8(int(rgba.G) * a / 255),
+		B: uint8(int(rgba.B) * a / 255),
+		A: uint8(int(rgba.A) * a / 255),
+	}
+}
+
+// parseFillColor 解析填充颜色
+// 入参: fillColor 填充颜色节点
+// 返回: color.Color 颜色对象
+func parseFillColor(fillColor *FillColor) color.Color {
+	if fillColor == nil {
+		return nil
+	}
+	if fillColor.Pattern != nil {
+		return nil
+	}
+	if fillColor.AxialShd != nil {
+		return parseShdColor(fillColor.AxialShd.Segment, fillColor.Alpha)
+	}
+	if fillColor.RadialShd != nil {
+		return parseShdColor(fillColor.RadialShd.Segment, fillColor.Alpha)
+	}
+	if strings.TrimSpace(fillColor.Value) != "" {
+		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+	}
+	return nil
+}
+
+// parseFillPaint 解析填充画刷
+// 入参: fillColor 填充颜色节点, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
+// 返回: any 填充画刷
+func parseFillPaint(fillColor *FillColor, x, y, pageH, originX, originY float64) any {
+	if fillColor == nil {
+		return nil
+	}
+	if fillColor.Pattern != nil {
+		return nil
+	}
+	if gradient := parseAxialShdGradient(fillColor.AxialShd, fillColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
+		return gradient
+	}
+	if gradient := parseRadialShdGradient(fillColor.RadialShd, fillColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
+		return gradient
+	}
+	if fillColor.AxialShd != nil {
+		return parseShdColor(fillColor.AxialShd.Segment, fillColor.Alpha)
+	}
+	if fillColor.RadialShd != nil {
+		return parseShdColor(fillColor.RadialShd.Segment, fillColor.Alpha)
+	}
+	if strings.TrimSpace(fillColor.Value) != "" {
+		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+	}
+	return nil
+}
+
+// parseStrokeColor 解析勾边颜色
+// 入参: strokeColor 勾边颜色节点
+// 返回: color.Color 颜色对象
+func parseStrokeColor(strokeColor *StrokeColor) color.Color {
+	if strokeColor == nil {
+		return nil
+	}
+	if strokeColor.AxialShd != nil {
+		return parseShdColor(strokeColor.AxialShd.Segment, strokeColor.Alpha)
+	}
+	if strokeColor.RadialShd != nil {
+		return parseShdColor(strokeColor.RadialShd.Segment, strokeColor.Alpha)
+	}
+	if strings.TrimSpace(strokeColor.Value) != "" {
+		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
+	}
+	return nil
+}
+
+// parseStrokePaint 解析勾边画刷
+// 入参: strokeColor 勾边颜色节点, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
+// 返回: any 勾边画刷
+func parseStrokePaint(strokeColor *StrokeColor, x, y, pageH, originX, originY float64) any {
+	if strokeColor == nil {
+		return nil
+	}
+	if gradient := parseAxialShdGradient(strokeColor.AxialShd, strokeColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
+		return gradient
+	}
+	if gradient := parseRadialShdGradient(strokeColor.RadialShd, strokeColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
+		return gradient
+	}
+	if strokeColor.AxialShd != nil {
+		return parseShdColor(strokeColor.AxialShd.Segment, strokeColor.Alpha)
+	}
+	if strokeColor.RadialShd != nil {
+		return parseShdColor(strokeColor.RadialShd.Segment, strokeColor.Alpha)
+	}
+	if strings.TrimSpace(strokeColor.Value) != "" {
+		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
+	}
+	return nil
+}
+
+// patternColor 获取图案单元默认颜色
+// 入参: fillColor 填充颜色节点
+// 返回: color.Color 默认颜色
+func patternColor(fillColor *FillColor) color.Color {
+	if fillColor == nil || strings.TrimSpace(fillColor.Value) == "" {
+		return nil
+	}
+	return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
+}
+
+// parseShdColor 解析渐变颜色
+// 入参: segments 渐变分段, alpha 透明度
+// 返回: color.Color 颜色对象
+func parseShdColor(segments []ShdSegment, alpha *int) color.Color {
+	for _, segment := range segments {
+		if strings.TrimSpace(segment.Color.Value) == "" {
+			continue
+		}
+		segmentAlpha := alpha
+		if segmentAlpha == nil {
+			segmentAlpha = segment.Color.Alpha
+		}
+		return parseColorWithAlpha(segment.Color.Value, segmentAlpha)
+	}
+	return color.Black
+}
+
+// parseShdSegments 解析渐变分段
+// 入参: segments 渐变分段, alpha 透明度
+// 返回: canvas.Grad 渐变分段
+func parseShdSegments(segments []ShdSegment, alpha *int) canvas.Grad {
+	gradient := canvas.NewGradient()
+	for _, segment := range segments {
+		if strings.TrimSpace(segment.Color.Value) == "" {
+			continue
+		}
+		segmentAlpha := alpha
+		if segmentAlpha == nil {
+			segmentAlpha = segment.Color.Alpha
+		}
+		gradient.Add(segment.Position, colorToRGBA(parseColorWithAlpha(segment.Color.Value, segmentAlpha)))
+	}
+	if len(gradient) == 0 {
+		return nil
+	}
+	return gradient
+}
+
+// parseAxialShdGradient 解析轴向渐变
+// 入参: axialShd 轴向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
+// 返回: canvas.Gradient 渐变对象
+func parseAxialShdGradient(axialShd *AxialShd, alpha *int, x, y, pageH, originX, originY float64) canvas.Gradient {
+	if axialShd == nil {
+		return nil
+	}
+	start := parseFloats(axialShd.StartPoint)
+	end := parseFloats(axialShd.EndPoint)
+	if len(start) < 2 || len(end) < 2 {
+		return nil
+	}
+	gradient := parseShdSegments(axialShd.Segment, alpha)
+	if gradient == nil {
+		return nil
+	}
+	startPoint := canvas.Point{X: x + start[0] - originX, Y: pageH - (y + start[1]) - originY}
+	endPoint := canvas.Point{X: x + end[0] - originX, Y: pageH - (y + end[1]) - originY}
+	if startPoint.Equals(endPoint) {
+		return nil
+	}
+	return gradient.ToLinear(startPoint, endPoint)
+}
+
+// parseRadialShdGradient 解析径向渐变
+// 入参: radialShd 径向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
+// 返回: canvas.Gradient 渐变对象
+func parseRadialShdGradient(radialShd *RadialShd, alpha *int, x, y, pageH, originX, originY float64) canvas.Gradient {
+	if radialShd == nil || radialShd.EndRadius <= 0 {
+		return nil
+	}
+	start := parseFloats(radialShd.StartPoint)
+	end := parseFloats(radialShd.EndPoint)
+	if len(start) < 2 || len(end) < 2 {
+		return nil
+	}
+	gradient := parseShdSegments(radialShd.Segment, alpha)
+	if gradient == nil {
+		return nil
+	}
+	startPoint := canvas.Point{X: x + start[0] - originX, Y: pageH - (y + start[1]) - originY}
+	endPoint := canvas.Point{X: x + end[0] - originX, Y: pageH - (y + end[1]) - originY}
+	return gradient.ToRadial(startPoint, radialShd.StartRadius, endPoint, radialShd.EndRadius)
+}
+
+// colorToRGBA 转换颜色对象
+// 入参: c 颜色对象
+// 返回: color.RGBA RGBA颜色
+func colorToRGBA(c color.Color) color.RGBA {
+	if rgba, ok := c.(color.RGBA); ok {
+		return rgba
+	}
+	r, g, b, a := c.RGBA()
+	return color.RGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: uint8(a >> 8)}
+}
@@ -158,7 +158,6 @@ func (r *Reader) Doc() (*Document, error) {
 	if doc.Signatures == "" {
 		doc.Signatures = docAttr.Signatures
 	}
-	r.OFD.DocBody[0].DocInfo.DocID = "loaded"
 	if doc.CommonData.DocumentRes != "" {
 		r.loadRes(doc.CommonData.DocumentRes)
 	}
@@ -177,7 +176,7 @@ func (r *Reader) loadRes(resPath string) {
 	if resPath == "" {
 		return
 	}
-	fullPath := path.Join(r.RootDir, resPath)
+	fullPath := r.ResPath(resPath)
 	data, err := r.readFile(fullPath)
 	if err != nil {
 		return
@@ -236,7 +235,7 @@ func resolveResourcePath(resPath, baseLoc, filePath string) string {
 // 入参: page 页面对象
 // 返回: *PageContent 页面内容, error 错误信息
 func (r *Reader) PageContent(page Page) (*PageContent, error) {
-	fullPath := path.Join(r.RootDir, page.BaseLoc)
+	fullPath := r.ResPath(page.BaseLoc)
 	data, err := r.readFile(fullPath)
 	if err != nil {
 		return nil, err
@@ -261,7 +260,9 @@ func (r *Reader) ResPath(resLink string) string {
 	if resLink == "" {
 		return ""
 	}
-	resLink = strings.TrimPrefix(resLink, "/")
+	if strings.HasPrefix(resLink, "/") {
+		return cleanPackagePath(resLink)
+	}
 	resLink = path.Clean(resLink)
 	rootDir := strings.TrimPrefix(strings.ReplaceAll(r.RootDir, "\\", "/"), "/")
 	if rootDir != "" && (resLink == rootDir || strings.HasPrefix(resLink, rootDir+"/")) {
@@ -278,17 +279,19 @@ func (r *Reader) ResData(resLink string) ([]byte, error) {
 	return r.readFile(fullPath)
 }

-// DocRoots 获取所有文档根路径
-// 返回: []string 路径列表
-func (r *Reader) DocRoots() []string {
-	var roots []string
-	if r.OFD == nil {
-		return roots
+// readDocumentPart 读取文档关联文件
+// 入参: loc 文件位置, value 文档结构
+// 返回: string 文件路径, error 错误信息
+func (r *Reader) readDocumentPart(loc string, value any) (string, error) {
+	fullPath := r.ResPath(strings.TrimSpace(loc))
+	data, err := r.readFile(fullPath)
+	if err != nil {
+		return "", err
 	}
-	for _, body := range r.OFD.DocBody {
-		roots = append(roots, body.DocRoot)
+	if err := xml.Unmarshal(data, value); err != nil {
+		return "", fmt.Errorf("failed to unmarshal %s: %w", path.Base(fullPath), err)
 	}
-	return roots
+	return fullPath, nil
 }

 // Version 获取OFD版本号
@@ -338,6 +341,26 @@ func (r *Reader) Outlines() ([]OutlineElem, error) {
 	return doc.Outlines.OutlineElem, nil
 }

+// Actions 获取文档动作
+// 返回: []Action 动作列表, error 错误信息
+func (r *Reader) Actions() ([]Action, error) {
+	doc, err := r.Doc()
+	if err != nil {
+		return nil, err
+	}
+	return doc.Actions, nil
+}
+
+// Bookmarks 获取文档书签
+// 返回: []Bookmark 书签列表, error 错误信息
+func (r *Reader) Bookmarks() ([]Bookmark, error) {
+	doc, err := r.Doc()
+	if err != nil {
+		return nil, err
+	}
+	return doc.Bookmarks.Bookmark, nil
+}
+
 // Attachments 获取附件列表
 // 返回: []Attachment 附件列表, error 错误信息
 func (r *Reader) Attachments() ([]Attachment, error) {
@@ -345,9 +368,50 @@ func (r *Reader) Attachments() ([]Attachment, error) {
 	if err != nil {
 		return nil, err
 	}
+	if strings.TrimSpace(doc.Attachments.Path) != "" && doc.Attachments.Attachment == nil {
+		var attachments Attachments
+		partPath, err := r.readDocumentPart(doc.Attachments.Path, &attachments)
+		if err != nil {
+			return nil, err
+		}
+		for i := range attachments.Attachment {
+			attachment := &attachments.Attachment[i]
+			attachment.FileLoc = resolveResourcePath(partPath, "", attachment.FileLoc)
+		}
+		if attachments.Attachment == nil {
+			attachments.Attachment = []Attachment{}
+		}
+		doc.Attachments.Attachment = attachments.Attachment
+	}
 	return doc.Attachments.Attachment, nil
 }

+// CustomTags 获取自定义标引
+// 返回: []CustomTag 自定义标引列表, error 错误信息
+func (r *Reader) CustomTags() ([]CustomTag, error) {
+	doc, err := r.Doc()
+	if err != nil {
+		return nil, err
+	}
+	if strings.TrimSpace(doc.CustomTags.Path) != "" && doc.CustomTags.CustomTag == nil {
+		var customTags CustomTags
+		partPath, err := r.readDocumentPart(doc.CustomTags.Path, &customTags)
+		if err != nil {
+			return nil, err
+		}
+		for i := range customTags.CustomTag {
+			tag := &customTags.CustomTag[i]
+			tag.SchemaLoc = resolveResourcePath(partPath, "", tag.SchemaLoc)
+			tag.FileLoc = resolveResourcePath(partPath, "", tag.FileLoc)
+		}
+		if customTags.CustomTag == nil {
+			customTags.CustomTag = []CustomTag{}
+		}
+		doc.CustomTags.CustomTag = customTags.CustomTag
+	}
+	return doc.CustomTags.CustomTag, nil
+}
+
 // CustomDatas 获取自定义数据
 // 返回: []CustomData 自定义数据列表, error 错误信息
 func (r *Reader) CustomDatas() ([]CustomData, error) {
@@ -361,12 +425,29 @@ func (r *Reader) CustomDatas() ([]CustomData, error) {
 	return info.CustomDatas.CustomData, nil
 }

-// Extensions 获取分列扩展项
+// Extensions 获取扩展项
 // 返回: []Extension 扩展项列表, error 错误信息
 func (r *Reader) Extensions() ([]Extension, error) {
 	doc, err := r.Doc()
 	if err != nil {
 		return nil, err
 	}
+	if strings.TrimSpace(doc.Extensions.Path) != "" && doc.Extensions.Extension == nil {
+		var extensions Extensions
+		partPath, err := r.readDocumentPart(doc.Extensions.Path, &extensions)
+		if err != nil {
+			return nil, err
+		}
+		for i := range extensions.Extension {
+			extension := &extensions.Extension[i]
+			for j := range extension.ExtendData {
+				extension.ExtendData[j] = resolveResourcePath(partPath, "", extension.ExtendData[j])
+			}
+		}
+		if extensions.Extension == nil {
+			extensions.Extension = []Extension{}
+		}
+		doc.Extensions.Extension = extensions.Extension
+	}
 	return doc.Extensions.Extension, nil
 }
@@ -0,0 +1,386 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bufio"
+	"image"
+	"image/color"
+	"io"
+
+	"github.com/tdewolff/canvas"
+	canvasimage "github.com/tdewolff/canvas/image"
+	"github.com/tdewolff/canvas/renderers/rasterizer"
+	"golang.org/x/image/draw"
+)
+
+// 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, parentClip 父级裁剪路径
+func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float64, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
+	if obj.Visible != nil && !*obj.Visible {
+		return
+	}
+	resPath, ok := r.Reader.ResMap[obj.ResourceID]
+	if !ok {
+		return
+	}
+	img, err := r.decodeImageResource(resPath)
+	if err != nil {
+		return
+	}
+	box, _ := ParseBox(obj.Boundary)
+	if maskPath, ok := r.Reader.ResMap[obj.ImageMask]; ok {
+		if mask, err := r.decodeImageResource(maskPath); err == nil {
+			img = imageWithMask(img, mask)
+		}
+	}
+	img = imageWithAlpha(img, obj.Alpha)
+	imgBounds := img.Bounds()
+	imgW, imgH := float64(imgBounds.Dx()), float64(imgBounds.Dy())
+	if imgW <= 0 || imgH <= 0 {
+		return
+	}
+	ctm := NewMatrix(obj.CTM)
+	if obj.CTM == "" {
+		ctm = Matrix{a: box.W, d: box.H}
+	}
+	objectCTM := ctm
+	if parentCTM != nil {
+		objectCTM = parentCTM.Multiply(ctm)
+	}
+	var m canvas.Matrix
+	if boundaryInCTM && parentCTM != nil {
+		x0 := box.X + ctm.c + ctm.e
+		y0 := box.Y + ctm.d + ctm.f
+		m = canvas.Matrix{
+			{(parentCTM.a*ctm.a + parentCTM.c*ctm.b) / imgW, -(parentCTM.a*ctm.c + parentCTM.c*ctm.d) / imgH, parentCTM.a*x0 + parentCTM.c*y0 + parentCTM.e},
+			{-(parentCTM.b*ctm.a + parentCTM.d*ctm.b) / imgW, (parentCTM.b*ctm.c + parentCTM.d*ctm.d) / imgH, pageH - (parentCTM.b*x0 + parentCTM.d*y0 + parentCTM.f)},
+		}
+	} else {
+		if parentCTM != nil {
+			ctm = parentCTM.Multiply(ctm)
+		}
+		m = canvas.Matrix{
+			{ctm.a / imgW, -ctm.c / imgH, box.X + ctm.c + ctm.e},
+			{-ctm.b / imgW, ctm.d / imgH, pageH - box.Y - ctm.d - ctm.f},
+		}
+	}
+	clipPath := intersectClipPath(parentClip, r.buildClipPath(obj.Clips, pageH, box.X, box.Y, objectCTM))
+	img = imageWithClip(img, clipPath, m)
+	img, pad := imageWithTransparentEdge(img)
+	if pad > 0 {
+		p := float64(pad)
+		m[0][2] -= m[0][0]*p + m[0][1]*p
+		m[1][2] -= m[1][0]*p + m[1][1]*p
+	}
+	ctx.RenderImage(img, ctx.CoordSystemView().Mul(ctx.View()).Mul(m))
+}
+
+// imageWithMask 应用图片蒙版
+// 入参: img 图片对象, mask 蒙版图片
+// 返回: image.Image 蒙版处理后的图片对象
+func imageWithMask(img, mask image.Image) image.Image {
+	if img == nil || mask == nil {
+		return img
+	}
+	bounds := img.Bounds()
+	if bounds.Empty() || mask.Bounds().Empty() {
+		return img
+	}
+	source := imagePixelSource(img)
+	maskSource := imagePixelSource(mask)
+	maskBounds := maskSource.Bounds()
+	var opacity image.Image = maskSource
+	if bounds.Size() != maskBounds.Size() {
+		resized := image.NewGray(bounds)
+		draw.CatmullRom.Scale(resized, bounds, maskSource, maskBounds, draw.Src, nil)
+		opacity = resized
+		maskBounds = bounds
+	}
+	out := image.NewNRGBA(bounds)
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			mx := maskBounds.Min.X + x - bounds.Min.X
+			my := maskBounds.Min.Y + y - bounds.Min.Y
+			a := color.GrayModel.Convert(opacity.At(mx, my)).(color.Gray).Y
+			c := imageNRGBAAt(source, x, y)
+			c.A = uint8(int(c.A) * int(a) / 255)
+			out.SetNRGBA(x, y, c)
+		}
+	}
+	return out
+}
+
+// imageWithClip 应用图片裁剪区域
+// 入参: img 图片对象, clipPath 裁剪路径, m 图片变换矩阵
+// 返回: image.Image 裁剪后的图片对象
+func imageWithClip(img image.Image, clipPath *canvas.Path, m canvas.Matrix) image.Image {
+	if img == nil || clipPath == nil || m.Det() == 0 {
+		return img
+	}
+	bounds := img.Bounds()
+	w, h := bounds.Dx(), bounds.Dy()
+	if w == 0 || h == 0 {
+		return img
+	}
+	p0 := m.Dot(canvas.Point{})
+	p1 := m.Dot(canvas.Point{X: float64(w)})
+	p2 := m.Dot(canvas.Point{X: float64(w), Y: float64(h)})
+	p3 := m.Dot(canvas.Point{Y: float64(h)})
+	imagePath := &canvas.Path{}
+	imagePath.MoveTo(p0.X, p0.Y)
+	imagePath.LineTo(p1.X, p1.Y)
+	imagePath.LineTo(p2.X, p2.Y)
+	imagePath.LineTo(p3.X, p3.Y)
+	imagePath.Close()
+	if rect, ok := rectangularPath(clipPath); ok {
+		if rect.Contains(imagePath.FastBounds()) {
+			return img
+		}
+	} else if clipPath.Contains(imagePath) {
+		return img
+	}
+	clip := clipPath.Copy().Transform(m.Inv())
+	clipCanvas := canvas.New(float64(w), float64(h))
+	ctx := canvas.NewContext(clipCanvas)
+	ctx.SetFillColor(canvas.White)
+	ctx.SetStrokeColor(canvas.Transparent)
+	ctx.DrawPath(0, 0, clip)
+	mask := rasterizer.Draw(clipCanvas, canvas.DPMM(1), canvas.DefaultColorSpace)
+	opaque := true
+	for y := 0; y < h && opaque; y++ {
+		for x := 0; x < w; x++ {
+			if mask.RGBAAt(x, y).A != 255 {
+				opaque = false
+				break
+			}
+		}
+	}
+	if opaque {
+		return img
+	}
+	source := imagePixelSource(img)
+	out := image.NewNRGBA(bounds)
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			c := imageNRGBAAt(source, x, y)
+			a := mask.RGBAAt(x-bounds.Min.X, y-bounds.Min.Y).A
+			c.A = uint8(int(c.A) * int(a) / 255)
+			out.SetNRGBA(x, y, c)
+		}
+	}
+	return out
+}
+
+// decodeImageResource 解码图片资源
+// 入参: resPath 图片资源路径
+// 返回: image.Image 图片对象, error 错误信息
+func (r *Renderer) decodeImageResource(resPath string) (image.Image, error) {
+	rc, err := r.Reader.openFile(r.Reader.ResPath(resPath))
+	if err != nil {
+		return nil, err
+	}
+	defer rc.Close()
+	reader := bufio.NewReaderSize(rc, 8)
+	header, _ := reader.Peek(8)
+	if isJPEGData(header) {
+		img, err := canvasimage.NewJPEGImage(reader)
+		if err != nil {
+			return nil, err
+		}
+		if r.decodeImages {
+			return img.Image()
+		}
+		return img, nil
+	}
+	if isPNGData(header) {
+		img, err := canvasimage.NewPNGImage(reader)
+		if err != nil {
+			return nil, err
+		}
+		if r.decodeImages {
+			return img.Image()
+		}
+		return img, nil
+	}
+	data, err := io.ReadAll(reader)
+	if err != nil {
+		return nil, err
+	}
+	img, _, err := decodeImageData(data)
+	return img, err
+}
+
+// imageWithAlpha 合并图片透明度
+// 入参: img 图片对象, alpha 对象透明度
+// 返回: image.Image 合并后的图片对象
+func imageWithAlpha(img image.Image, alpha *int) image.Image {
+	if img == nil || alpha == nil {
+		return img
+	}
+	a := clampColor(*alpha)
+	if a == 255 {
+		return img
+	}
+	bounds := img.Bounds()
+	out := image.NewNRGBA(bounds)
+	source := imagePixelSource(img)
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			c := imageNRGBAAt(source, x, y)
+			c.A = uint8(int(c.A) * a / 255)
+			out.SetNRGBA(x, y, c)
+		}
+	}
+	return out
+}
+
+// imageWithTransparentEdge 补齐透明图片边缘颜色
+// 入参: img 图片对象
+// 返回: image.Image 补齐后的图片对象, int 补齐像素数
+func imageWithTransparentEdge(img image.Image) (image.Image, int) {
+	if img == nil {
+		return img, 0
+	}
+	bounds := img.Bounds()
+	w, h := bounds.Dx(), bounds.Dy()
+	if w == 0 || h == 0 {
+		return img, 0
+	}
+	if src, ok := img.(*canvasimage.Image); ok && src.Mimetype == "image/jpeg" && src.Mask == nil {
+		return img, 0
+	}
+	source := imagePixelSource(img)
+	if opaque, ok := source.(interface{ Opaque() bool }); ok && opaque.Opaque() {
+		return img, 0
+	}
+	hasZero, hasVisible := false, false
+	src, ok := source.(*image.NRGBA)
+	if ok {
+		srcBounds := src.Bounds()
+		for y := srcBounds.Min.Y; y < srcBounds.Max.Y; y++ {
+			offset := src.PixOffset(srcBounds.Min.X, y) + 3
+			for x := 0; x < w; x++ {
+				if src.Pix[offset] == 0 {
+					hasZero = true
+				} else {
+					hasVisible = true
+				}
+				offset += 4
+			}
+		}
+	} else {
+		src = image.NewNRGBA(image.Rect(0, 0, w, h))
+		for y := 0; y < h; y++ {
+			for x := 0; x < w; x++ {
+				c := imageNRGBAAt(source, bounds.Min.X+x, bounds.Min.Y+y)
+				src.SetNRGBA(x, y, c)
+				if c.A == 0 {
+					hasZero = true
+				} else {
+					hasVisible = true
+				}
+			}
+		}
+	}
+	if !hasZero || !hasVisible {
+		return img, 0
+	}
+	srcBounds := src.Bounds()
+	out := image.NewNRGBA(image.Rect(0, 0, w+2, h+2))
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			sx, sy := srcBounds.Min.X+x, srcBounds.Min.Y+y
+			c := src.NRGBAAt(sx, sy)
+			if c.A == 0 {
+				if edge, ok := transparentEdgeColor(src, sx, sy); ok {
+					c = edge
+				}
+			}
+			out.SetNRGBA(x+1, y+1, c)
+		}
+	}
+	for x := 0; x < w; x++ {
+		out.SetNRGBA(x+1, 0, transparentPaddingColor(out.NRGBAAt(x+1, 1)))
+		out.SetNRGBA(x+1, h+1, transparentPaddingColor(out.NRGBAAt(x+1, h)))
+	}
+	for y := 0; y < h; y++ {
+		out.SetNRGBA(0, y+1, transparentPaddingColor(out.NRGBAAt(1, y+1)))
+		out.SetNRGBA(w+1, y+1, transparentPaddingColor(out.NRGBAAt(w, y+1)))
+	}
+	out.SetNRGBA(0, 0, transparentPaddingColor(out.NRGBAAt(1, 1)))
+	out.SetNRGBA(w+1, 0, transparentPaddingColor(out.NRGBAAt(w, 1)))
+	out.SetNRGBA(0, h+1, transparentPaddingColor(out.NRGBAAt(1, h)))
+	out.SetNRGBA(w+1, h+1, transparentPaddingColor(out.NRGBAAt(w, h)))
+	return out, 1
+}
+
+// imagePixelSource 获取图片像素源
+// 入参: img 图片对象
+// 返回: image.Image 图片像素源
+func imagePixelSource(img image.Image) image.Image {
+	if src, ok := img.(*canvasimage.Image); ok {
+		if decoded, err := src.Image(); err == nil {
+			return decoded
+		}
+	}
+	return img
+}
+
+// imageNRGBAAt 获取图片NRGBA像素
+// 入参: img 图片对象, x X坐标, y Y坐标
+// 返回: color.NRGBA NRGBA像素
+func imageNRGBAAt(img image.Image, x, y int) color.NRGBA {
+	if src, ok := img.(*image.NRGBA); ok {
+		return src.NRGBAAt(x, y)
+	}
+	return color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
+}
+
+// transparentEdgeColor 获取透明像素相邻的可见颜色
+// 入参: img 图片对象, x X坐标, y Y坐标
+// 返回: color.NRGBA 颜色, bool 是否存在
+func transparentEdgeColor(img *image.NRGBA, x, y int) (color.NRGBA, bool) {
+	bounds := img.Bounds()
+	var best color.NRGBA
+	for dy := -1; dy <= 1; dy++ {
+		for dx := -1; dx <= 1; dx++ {
+			if dx == 0 && dy == 0 {
+				continue
+			}
+			nx, ny := x+dx, y+dy
+			if nx < bounds.Min.X || nx >= bounds.Max.X || ny < bounds.Min.Y || ny >= bounds.Max.Y {
+				continue
+			}
+			c := img.NRGBAAt(nx, ny)
+			if c.A > best.A {
+				best = c
+			}
+		}
+	}
+	if best.A == 0 {
+		return color.NRGBA{}, false
+	}
+	best.A = 1
+	return best, true
+}
+
+// transparentPaddingColor 获取透明补齐颜色
+// 入参: c 边缘颜色
+// 返回: color.NRGBA 补齐颜色
+func transparentPaddingColor(c color.NRGBA) color.NRGBA {
+	c.A = 1
+	return c
+}
@@ -0,0 +1,254 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"image/color"
+
+	"github.com/tdewolff/canvas"
+)
+
+// renderAnnotations 渲染页面注释外观
+// 入参: ctx 画布上下文, pageID 页面ID, pageH 页面高度
+func (r *Renderer) renderAnnotations(ctx *canvas.Context, pageID string, pageH float64) {
+	for _, annot := range r.Reader.Annots[pageID] {
+		if len(annot.Appearance.Objects) == 0 {
+			continue
+		}
+		box, _ := ParseBox(annot.Appearance.Boundary)
+		ctm := Matrix{a: 1, d: 1, e: box.X, f: box.Y}
+		for _, obj := range annot.Appearance.Objects {
+			r.renderObject(ctx, obj, pageH, nil, nil, 0, &ctm, false, nil)
+		}
+	}
+}
+
+// renderTemplate 渲染模板
+// 入参: ctx 画布上下文, templateID 模板ID, pageH 页面高度
+func (r *Renderer) renderTemplate(ctx *canvas.Context, templateID string, pageH float64) {
+	tplContent := r.templatePageCache[templateID]
+	if tplContent == nil {
+		var tplPage *TemplatePage
+		for i := range r.Reader.doc.CommonData.TemplatePage {
+			if r.Reader.doc.CommonData.TemplatePage[i].ID == templateID {
+				tplPage = &r.Reader.doc.CommonData.TemplatePage[i]
+				break
+			}
+		}
+		if tplPage == nil {
+			return
+		}
+		var err error
+		tplContent, err = r.Reader.PageContent(Page{BaseLoc: tplPage.BaseLoc})
+		if err != nil {
+			return
+		}
+		r.templatePageCache[templateID] = tplContent
+	}
+	if tplContent.Content.Layer != nil {
+		for _, layer := range tplContent.Content.Layer {
+			r.renderLayer(ctx, layer, pageH, nil, nil, 0, nil)
+		}
+	}
+}
+
+// renderLayer 渲染图层
+// 入参: ctx 画布上下文, layer 图层对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽, parentCTM 父级CTM
+func (r *Renderer) renderLayer(ctx *canvas.Context, layer Layer, pageH float64, defaultFill, defaultStroke color.Color, defaultLW float64, parentCTM *Matrix) {
+	defaultFill, defaultStroke, defaultLW = r.drawParamDefaults(layer.DrawParam, defaultFill, defaultStroke, defaultLW)
+	if len(layer.Objects) > 0 {
+		for _, obj := range layer.Objects {
+			r.renderObject(ctx, obj, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, false, nil)
+		}
+		return
+	}
+	for _, textObj := range layer.TextObject {
+		r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, parentCTM, false, nil)
+	}
+	for _, pathObj := range layer.PathObject {
+		r.renderPath(ctx, pathObj, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, false, nil)
+	}
+	for _, imgObj := range layer.ImageObject {
+		r.renderImage(ctx, imgObj, pageH, parentCTM, false, nil)
+	}
+	for _, cgu := range layer.CompositeGraphicUnit {
+		r.renderCompositeGraphicUnit(ctx, cgu, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, false, nil)
+	}
+}
+
+// renderCompositeGraphicUnit 渲染复合图元
+// 入参: ctx 画布上下文, cgu 复合图元对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽, parentCTM 父级CTM, boundaryInCTM 边界是否参与CTM变换, parentClip 父级裁剪路径
+func (r *Renderer) renderCompositeGraphicUnit(ctx *canvas.Context, cgu CompositeGraphicUnit, pageH float64, defaultFill, defaultStroke color.Color, defaultLW float64, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
+	if cgu.Visible != nil && !*cgu.Visible {
+		return
+	}
+	ctx.Push()
+	currentCTM := NewMatrix(cgu.CTM)
+	if parentCTM != nil {
+		currentCTM = parentCTM.Multiply(currentCTM)
+	}
+	box, _ := ParseBox(cgu.Boundary)
+	clipPath := intersectClipPath(parentClip, r.buildClipPath(cgu.Clips, pageH, box.X, box.Y, currentCTM))
+	if cgu.ResourceID != "" {
+		if ref, ok := r.CompositeGraphicUnits[cgu.ResourceID]; ok {
+			refCopy := *ref
+			refCopy.Alpha = mergeAlpha(refCopy.Alpha, cgu.Alpha)
+			r.renderCompositeGraphicUnit(ctx, refCopy, pageH, defaultFill, defaultStroke, defaultLW, &currentCTM, true, clipPath)
+		}
+	}
+	defaultFill, defaultStroke, defaultLW = r.drawParamDefaults(cgu.DrawParam, defaultFill, defaultStroke, defaultLW)
+	if len(cgu.Objects) > 0 {
+		for _, obj := range cgu.Objects {
+			obj = mergeGraphicObjectAlpha(obj, cgu.Alpha)
+			r.renderObject(ctx, obj, pageH, defaultFill, defaultStroke, defaultLW, &currentCTM, boundaryInCTM, clipPath)
+		}
+		ctx.Pop()
+		return
+	}
+	for _, imgObj := range cgu.ImageObject {
+		imgObj.Alpha = mergeAlpha(imgObj.Alpha, cgu.Alpha)
+		r.renderImage(ctx, imgObj, pageH, &currentCTM, boundaryInCTM, clipPath)
+	}
+	for _, pathObj := range cgu.PathObject {
+		pathObj.Alpha = mergeAlpha(pathObj.Alpha, cgu.Alpha)
+		r.renderPath(ctx, pathObj, pageH, defaultFill, defaultStroke, defaultLW, &currentCTM, boundaryInCTM, clipPath)
+	}
+	for _, textObj := range cgu.TextObject {
+		textObj.Alpha = mergeAlpha(textObj.Alpha, cgu.Alpha)
+		r.renderText(ctx, textObj, pageH, defaultFill, defaultStroke, &currentCTM, boundaryInCTM, clipPath)
+	}
+	for _, subCgu := range cgu.CompositeGraphicUnit {
+		subCgu.Alpha = mergeAlpha(subCgu.Alpha, cgu.Alpha)
+		r.renderCompositeGraphicUnit(ctx, subCgu, pageH, defaultFill, defaultStroke, defaultLW, &currentCTM, boundaryInCTM, clipPath)
+	}
+	ctx.Pop()
+}
+
+// renderObject 渲染图形对象
+// 入参: ctx 画布上下文, obj 图形对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽, parentCTM 父级CTM, boundaryInCTM 边界是否参与CTM变换, parentClip 父级裁剪路径
+func (r *Renderer) renderObject(ctx *canvas.Context, obj GraphicObject, pageH float64, defaultFill, defaultStroke color.Color, defaultLW float64, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
+	switch obj.Type {
+	case "TextObject":
+		r.renderText(ctx, obj.TextObject, pageH, defaultFill, defaultStroke, parentCTM, boundaryInCTM, parentClip)
+	case "PathObject":
+		r.renderPath(ctx, obj.PathObject, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, boundaryInCTM, parentClip)
+	case "ImageObject":
+		r.renderImage(ctx, obj.ImageObject, pageH, parentCTM, boundaryInCTM, parentClip)
+	case "CompositeGraphicUnit", "CompositeObject":
+		r.renderCompositeGraphicUnit(ctx, obj.CompositeGraphicUnit, pageH, defaultFill, defaultStroke, defaultLW, parentCTM, boundaryInCTM, parentClip)
+	}
+}
+
+// mergeGraphicObjectAlpha 合并图形对象透明度
+// 入参: obj 图形对象, alpha 父级透明度
+// 返回: GraphicObject 合并后的图形对象
+func mergeGraphicObjectAlpha(obj GraphicObject, alpha *int) GraphicObject {
+	if alpha == nil {
+		return obj
+	}
+	switch obj.Type {
+	case "TextObject":
+		obj.TextObject.Alpha = mergeAlpha(obj.TextObject.Alpha, alpha)
+	case "PathObject":
+		obj.PathObject.Alpha = mergeAlpha(obj.PathObject.Alpha, alpha)
+	case "ImageObject":
+		obj.ImageObject.Alpha = mergeAlpha(obj.ImageObject.Alpha, alpha)
+	case "CompositeGraphicUnit", "CompositeObject":
+		obj.CompositeGraphicUnit.Alpha = mergeAlpha(obj.CompositeGraphicUnit.Alpha, alpha)
+	}
+	return obj
+}
+
+// drawParamDefaults 合并绘制参数默认样式
+// 入参: id 绘制参数ID, defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽
+// 返回: color.Color 默认填充色, color.Color 默认描边色, float64 默认线宽
+func (r *Renderer) drawParamDefaults(id string, defaultFill, defaultStroke color.Color, defaultLW float64) (color.Color, color.Color, float64) {
+	if id == "" {
+		return defaultFill, defaultStroke, defaultLW
+	}
+	dp := r.getDrawParam(id, nil)
+	if dp == nil {
+		return defaultFill, defaultStroke, defaultLW
+	}
+	if dp.LineWidth > 0 {
+		defaultLW = dp.LineWidth
+	}
+	if dp.FillColor != nil {
+		defaultFill = parseFillColor(dp.FillColor)
+	}
+	if dp.StrokeColor != nil {
+		defaultStroke = parseStrokeColor(dp.StrokeColor)
+	}
+	return defaultFill, defaultStroke, defaultLW
+}
+
+// getDrawParam 获取绘制参数逻辑
+// 入参: id 参数ID, visited 访问记录
+// 返回: *DrawParam 绘制参数
+func (r *Renderer) getDrawParam(id string, visited map[string]bool) *DrawParam {
+	if visited == nil {
+		visited = make(map[string]bool)
+	}
+	if visited[id] {
+		return nil
+	}
+	visited[id] = true
+	if dp, ok := r.DrawParams[id]; ok {
+		if dp.Relative != "" {
+			base := r.getDrawParam(dp.Relative, visited)
+			if base == nil {
+				return dp
+			}
+			merged := *base
+			if dp.LineWidth > 0 {
+				merged.LineWidth = dp.LineWidth
+			}
+			if dp.Join != "" {
+				merged.Join = dp.Join
+			}
+			if dp.Cap != "" {
+				merged.Cap = dp.Cap
+			}
+			if dp.DashPattern != "" {
+				merged.DashPattern = dp.DashPattern
+				merged.DashOffset = dp.DashOffset
+			}
+			if dp.MiterLimit > 0 {
+				merged.MiterLimit = dp.MiterLimit
+			}
+			if dp.FillColor != nil {
+				merged.FillColor = dp.FillColor
+			}
+			if dp.StrokeColor != nil {
+				merged.StrokeColor = dp.StrokeColor
+			}
+			if dp.Font != "" {
+				merged.Font = dp.Font
+			}
+			if dp.Size > 0 {
+				merged.Size = dp.Size
+			}
+			if dp.Weight > 0 {
+				merged.Weight = dp.Weight
+			}
+			if dp.Italic {
+				merged.Italic = dp.Italic
+			}
+			return &merged
+		}
+		return dp
+	}
+	return nil
+}
@@ -0,0 +1,146 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"io"
+
+	"github.com/tdewolff/canvas"
+	"github.com/tdewolff/canvas/renderers"
+	"github.com/tdewolff/canvas/renderers/pdf"
+	"github.com/tdewolff/canvas/renderers/rasterizer"
+)
+
+// RenderToImage 渲染为光栅图
+// 入参: page 页面内容
+// 返回: image.Image 图像对象, error 错误信息
+func (r *Renderer) RenderToImage(page *PageContent) (image.Image, error) {
+	c, err := r.RenderPage(page)
+	if err != nil {
+		return nil, err
+	}
+	dpmm := r.DPI / 25.4
+	return rasterizer.Draw(c, canvas.DPMM(dpmm), canvas.DefaultColorSpace), nil
+}
+
+// RenderToSVG 渲染为SVG
+// 入参: page 页面内容, writer 输出流
+// 返回: error 错误信息
+func (r *Renderer) RenderToSVG(page *PageContent, writer io.Writer) error {
+	c, err := r.renderPage(page)
+	if err != nil {
+		return err
+	}
+	return c.Write(writer, renderers.SVG())
+}
+
+// replacePDFProducer 替换PDF的Producer属性
+// 入参: data PDF字节数据
+// 返回: []byte 替换后的PDF字节数据
+func replacePDFProducer(data []byte) []byte {
+	old := []byte("/Producer(tdewolff/canvas)")
+	idx := bytes.LastIndex(data, old)
+	if idx < 0 {
+		return data
+	}
+	dst := []byte("/Producer(xiaoqidun/ofdgo)")
+	copy(data[idx:idx+len(old)], dst)
+	return data
+}
+
+// RenderToPDF 渲染为PDF
+// 入参: page 页面内容, writer 输出流
+// 返回: error 错误信息
+func (r *Renderer) RenderToPDF(page *PageContent, writer io.Writer) error {
+	c, err := r.renderPage(page)
+	if err != nil {
+		return err
+	}
+	box, err := r.GetPageBox(page)
+	if err != nil {
+		return err
+	}
+	pages := []pdfPage{{Content: page, Box: box}}
+	navigation := newPDFNavigation(r, r.Reader.doc, pages)
+	var buf bytes.Buffer
+	p := pdf.New(&buf, c.W, c.H, nil)
+	p.SetInfo("", "", "", "", "xiaoqidun/ofdgo")
+	navigation.apply(p, 0)
+	c.RenderTo(p)
+	if err := p.Close(); err != nil {
+		return err
+	}
+	_, err = writer.Write(replacePDFProducer(buf.Bytes()))
+	return err
+}
+
+// RenderToEPS 渲染为EPS
+// 入参: page 页面内容, writer 输出流
+// 返回: error 错误信息
+func (r *Renderer) RenderToEPS(page *PageContent, writer io.Writer) error {
+	c, err := r.renderPage(page)
+	if err != nil {
+		return err
+	}
+	return c.Write(writer, renderers.EPS())
+}
+
+// RenderToMultiPagePDF 将整个文档导出为多页PDF
+// 入参: writer 输出流
+// 返回: error 错误信息
+func (r *Renderer) RenderToMultiPagePDF(writer io.Writer) error {
+	doc, err := r.Reader.Doc()
+	if err != nil {
+		return err
+	}
+	if len(doc.Pages.Page) == 0 {
+		return fmt.Errorf("no pages found")
+	}
+	pages := make([]pdfPage, len(doc.Pages.Page))
+	for i, pageRef := range doc.Pages.Page {
+		page, err := r.Reader.PageContent(pageRef)
+		if err != nil {
+			return fmt.Errorf("failed to read page %d: %w", i+1, err)
+		}
+		box, err := r.GetPageBox(page)
+		if err != nil {
+			return fmt.Errorf("failed to read page %d area: %w", i+1, err)
+		}
+		pages[i] = pdfPage{Content: page, Box: box}
+	}
+	navigation := newPDFNavigation(r, doc, pages)
+	var buf bytes.Buffer
+	p := pdf.New(&buf, pages[0].Box.W, pages[0].Box.H, nil)
+	p.SetInfo("", "", "", "", "xiaoqidun/ofdgo")
+	for i, page := range pages {
+		c, err := r.renderPage(page.Content)
+		if err != nil {
+			return fmt.Errorf("failed to render page %d: %w", i+1, err)
+		}
+		if i > 0 {
+			p.NewPage(c.W, c.H)
+		}
+		navigation.apply(p, i)
+		c.RenderTo(p)
+	}
+	if err := p.Close(); err != nil {
+		return err
+	}
+	_, err = writer.Write(replacePDFProducer(buf.Bytes()))
+	return err
+}
@@ -0,0 +1,591 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"image/color"
+	"math"
+	"strconv"
+	"strings"
+
+	"github.com/tdewolff/canvas"
+)
+
+const defaultPathLineWidth = 0.353
+
+type pathStyle struct {
+	fillColor        color.Color
+	strokeColor      color.Color
+	fillPaint        any
+	strokePaint      any
+	fillPattern      *Pattern
+	fillPatternColor color.Color
+	lineWidth        float64
+	lineCap          canvas.Capper
+	lineJoin         canvas.Joiner
+	dashOffset       float64
+	dashPattern      []float64
+}
+
+// newPathStyle 创建路径样式
+// 入参: defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽, alpha 对象透明度
+// 返回: pathStyle 路径样式
+func newPathStyle(defaultFill, defaultStroke color.Color, defaultLW float64, alpha *int) pathStyle {
+	style := pathStyle{
+		fillColor:   colorWithAlpha(defaultFill, alpha),
+		strokeColor: colorWithAlpha(defaultStroke, alpha),
+		lineWidth:   defaultLW,
+		lineCap:     canvas.ButtCap,
+		lineJoin:    canvas.MiterJoin,
+	}
+	if style.lineWidth == 0 {
+		style.lineWidth = defaultPathLineWidth
+	}
+	style.fillPaint = style.fillColor
+	style.strokePaint = style.strokeColor
+	return style
+}
+
+// applyFillColor 应用填充颜色
+// 入参: fill 填充颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyFillColor(fill *FillColor, bx, by, pageH float64, alpha *int) {
+	fillColorNode := withFillAlpha(fill, alpha)
+	s.fillPattern = fillColorNode.Pattern
+	s.fillPatternColor = patternColor(fillColorNode)
+	s.fillColor = parseFillColor(fillColorNode)
+	s.fillPaint = parseFillPaint(fillColorNode, bx, by, pageH, 0, 0)
+}
+
+// applyStrokeColor 应用描边颜色
+// 入参: stroke 描边颜色, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyStrokeColor(stroke *StrokeColor, bx, by, pageH float64, alpha *int) {
+	strokeColorNode := withStrokeAlpha(stroke, alpha)
+	s.strokeColor = parseStrokeColor(strokeColorNode)
+	s.strokePaint = parseStrokePaint(strokeColorNode, bx, by, pageH, 0, 0)
+}
+
+// pathLineCap 转换线帽样式
+// 入参: cap 线帽名称, fallback 默认线帽
+// 返回: canvas.Capper 线帽样式
+func pathLineCap(cap string, fallback canvas.Capper) canvas.Capper {
+	switch cap {
+	case "Round":
+		return canvas.RoundCap
+	case "Square":
+		return canvas.SquareCap
+	}
+	return fallback
+}
+
+// pathLineJoin 转换线连接样式
+// 入参: join 线连接名称, fallback 默认线连接
+// 返回: canvas.Joiner 线连接样式
+func pathLineJoin(join string, fallback canvas.Joiner) canvas.Joiner {
+	switch join {
+	case "Round":
+		return canvas.RoundJoin
+	case "Bevel":
+		return canvas.BevelJoin
+	}
+	return fallback
+}
+
+// applyDrawParam 应用绘制参数样式
+// 入参: dp 绘制参数, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
+func (s *pathStyle) applyDrawParam(dp *DrawParam, bx, by, pageH float64, alpha *int) {
+	if dp.LineWidth > 0 {
+		s.lineWidth = dp.LineWidth
+	}
+	if dp.FillColor != nil {
+		s.applyFillColor(dp.FillColor, bx, by, pageH, alpha)
+	}
+	if dp.StrokeColor != nil {
+		s.applyStrokeColor(dp.StrokeColor, bx, by, pageH, alpha)
+	}
+	if dp.Cap != "" {
+		s.lineCap = pathLineCap(dp.Cap, s.lineCap)
+	}
+	if dp.Join != "" {
+		s.lineJoin = pathLineJoin(dp.Join, s.lineJoin)
+	}
+	if dp.DashPattern != "" {
+		s.dashPattern = parseFloats(dp.DashPattern)
+		s.dashOffset = dp.DashOffset
+	}
+}
+
+// applyPathObject 应用路径对象样式
+// 入参: obj 路径对象, bx 边界X坐标, by 边界Y坐标, pageH 页面高度
+func (s *pathStyle) applyPathObject(obj PathObject, bx, by, pageH float64) {
+	if obj.LineWidth > 0 {
+		s.lineWidth = obj.LineWidth
+	}
+	if obj.FillColor != nil {
+		s.applyFillColor(obj.FillColor, bx, by, pageH, obj.Alpha)
+	}
+	if obj.StrokeColor != nil {
+		s.applyStrokeColor(obj.StrokeColor, bx, by, pageH, obj.Alpha)
+	}
+	if obj.Cap != "" {
+		s.lineCap = pathLineCap(obj.Cap, canvas.ButtCap)
+	}
+	if obj.Join != "" {
+		s.lineJoin = pathLineJoin(obj.Join, canvas.MiterJoin)
+	}
+	if obj.DashPattern != "" {
+		s.dashPattern = parseFloats(obj.DashPattern)
+		s.dashOffset = obj.DashOffset
+	}
+}
+
+// scale 应用路径变换缩放
+// 入参: ctm 变换矩阵
+func (s *pathStyle) scale(ctm Matrix) {
+	if scale := math.Sqrt(math.Abs(ctm.a*ctm.d - ctm.b*ctm.c)); scale > 0 {
+		s.lineWidth *= scale
+		s.dashOffset *= scale
+		for i := range s.dashPattern {
+			s.dashPattern[i] *= scale
+		}
+	}
+}
+
+// renderPath 渲染路径
+// 入参: ctx 画布上下文, obj 路径对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, defaultLW 默认线宽, parentCTM 父级CTM, boundaryInCTM 边界是否参与CTM变换, parentClip 父级裁剪路径
+func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64, defaultFill, defaultStroke color.Color, defaultLW float64, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
+	if obj.Visible != nil && !*obj.Visible {
+		return
+	}
+	ctx.Push()
+	bx, by := 0.0, 0.0
+	if obj.Boundary != "" {
+		if box, err := ParseBox(obj.Boundary); err == nil {
+			bx, by = box.X, box.Y
+		}
+	}
+	ctm := NewMatrix(obj.CTM)
+	if parentCTM != nil {
+		ctm = parentCTM.Multiply(ctm)
+	}
+	style := newPathStyle(defaultFill, defaultStroke, defaultLW, obj.Alpha)
+	if obj.DrawParam != "" {
+		if dp := r.getDrawParam(obj.DrawParam, nil); dp != nil {
+			style.applyDrawParam(dp, bx, by, pageH, obj.Alpha)
+		}
+	}
+	style.applyPathObject(obj, bx, by, pageH)
+	style.scale(ctm)
+	p := r.buildPath(obj, pageH, ctm, boundaryInCTM)
+	if rectPath := r.buildTinyFillRectPath(obj, pageH, ctm, bx, by); rectPath != nil {
+		p = rectPath
+	}
+	clipPath := intersectClipPath(parentClip, r.buildClipPath(obj.Clips, pageH, bx, by, ctm))
+	shouldFill := false
+	if obj.Fill != nil {
+		shouldFill = *obj.Fill
+	}
+	if style.fillPaint == nil {
+		style.fillPaint = style.fillColor
+	}
+	if shouldFill && style.fillPattern != nil {
+		fp := p
+		if clipPath != nil {
+			fp = p.Copy()
+			fp.Close()
+			fp = applyClipPath(fp, clipPath)
+		}
+		r.renderPattern(ctx, style.fillPattern, style.fillPatternColor, pageH, fp, ctm, bx, by)
+	} else if shouldFill && style.fillPaint != nil {
+		ctx.SetFill(style.fillPaint)
+		ctx.SetStrokeColor(canvas.Transparent)
+		fp := p
+		if clipPath != nil {
+			fp = p.Copy()
+			fp.Close()
+			fp = applyClipPath(fp, clipPath)
+		}
+		ctx.DrawPath(0, 0, fp)
+	}
+	shouldStroke := true
+	if obj.Stroke != nil {
+		shouldStroke = *obj.Stroke
+	}
+	if shouldStroke {
+		if style.strokePaint == nil {
+			style.strokePaint = style.strokeColor
+		}
+		if style.strokePaint == nil {
+			style.strokePaint = colorWithAlpha(canvas.Black, obj.Alpha)
+		}
+		ctx.SetFillColor(canvas.Transparent)
+		ctx.SetStroke(style.strokePaint)
+		ctx.SetStrokeWidth(style.lineWidth)
+		ctx.SetStrokeCapper(style.lineCap)
+		ctx.SetStrokeJoiner(style.lineJoin)
+		if len(style.dashPattern) > 0 {
+			ctx.SetDashes(style.dashOffset, style.dashPattern...)
+		}
+		if clipPath != nil {
+			sp := p.Copy()
+			if len(style.dashPattern) > 0 {
+				sp = sp.Dash(style.dashOffset, style.dashPattern...)
+			}
+			sp = sp.Stroke(style.lineWidth, style.lineCap, style.lineJoin, canvas.Tolerance)
+			sp = applyClipPath(sp, clipPath)
+			ctx.SetFill(style.strokePaint)
+			ctx.SetStrokeColor(canvas.Transparent)
+			ctx.DrawPath(0, 0, sp)
+		} else {
+			ctx.DrawPath(0, 0, p)
+		}
+	}
+	ctx.Pop()
+}
+
+// renderPattern 渲染图案填充
+// 入参: ctx 画布上下文, pattern 图案对象, defaultColor 默认颜色, pageH 页面高度, clip 填充区域, parentCTM 父级CTM, bx 边界X坐标, by 边界Y坐标
+func (r *Renderer) renderPattern(ctx *canvas.Context, pattern *Pattern, defaultColor color.Color, pageH float64, clip *canvas.Path, parentCTM Matrix, bx, by float64) {
+	if pattern == nil || clip == nil || len(pattern.CellContent.Objects) == 0 {
+		return
+	}
+	xStep, yStep := pattern.XStep, pattern.YStep
+	if xStep == 0 {
+		xStep = pattern.Width
+	}
+	if yStep == 0 {
+		yStep = pattern.Height
+	}
+	if xStep <= 0 || yStep <= 0 {
+		return
+	}
+	patternCTM := TranslationMatrix(bx, by).Multiply(parentCTM).Multiply(NewMatrix(pattern.CTM))
+	invCTM, ok := patternCTM.Invert()
+	if !ok {
+		return
+	}
+	bounds := clip.FastBounds()
+	points := [][2]float64{
+		{bounds.X0, pageH - bounds.Y0},
+		{bounds.X1, pageH - bounds.Y0},
+		{bounds.X1, pageH - bounds.Y1},
+		{bounds.X0, pageH - bounds.Y1},
+	}
+	minX, maxX := 0.0, 0.0
+	minY, maxY := 0.0, 0.0
+	for i, point := range points {
+		x, y := invCTM.Transform(point[0], point[1])
+		if i == 0 {
+			minX, maxX = x, x
+			minY, maxY = y, y
+			continue
+		}
+		minX = math.Min(minX, x)
+		maxX = math.Max(maxX, x)
+		minY = math.Min(minY, y)
+		maxY = math.Max(maxY, y)
+	}
+	startX := int(math.Floor(minX/xStep)) - 1
+	endX := int(math.Ceil(maxX/xStep)) + 1
+	startY := int(math.Floor(minY/yStep)) - 1
+	endY := int(math.Ceil(maxY/yStep)) + 1
+	for ix := startX; ix <= endX; ix++ {
+		for iy := startY; iy <= endY; iy++ {
+			tileCTM := patternCTM.Multiply(TranslationMatrix(float64(ix)*xStep, float64(iy)*yStep))
+			for _, obj := range pattern.CellContent.Objects {
+				r.renderObject(ctx, obj, pageH, defaultColor, defaultColor, 0, &tileCTM, false, clip)
+			}
+		}
+	}
+}
+
+// buildPath 解析路径并返回Canvas Path
+// 入参: obj 路径对象, pageH 页面高度, ctm 变换矩阵, boundaryInCTM 边界是否参与CTM变换
+// 返回: *canvas.Path 路径对象
+func (r *Renderer) buildPath(obj PathObject, pageH float64, ctm Matrix, boundaryInCTM bool) *canvas.Path {
+	bx, by := 0.0, 0.0
+	if obj.Boundary != "" {
+		if box, err := ParseBox(obj.Boundary); err == nil {
+			bx, by = box.X, box.Y
+		}
+	}
+	point := func(x, y float64) (float64, float64) {
+		if boundaryInCTM {
+			tx, ty := ctm.Transform(x+bx, y+by)
+			return tx, pageH - ty
+		}
+		tx, ty := ctm.Transform(x, y)
+		return tx + bx, pageH - (ty + by)
+	}
+	p := &canvas.Path{}
+	tokens := strings.Fields(obj.AbbreviatedData)
+	for i := 0; i < len(tokens); {
+		cmd := tokens[i]
+		i++
+		switch cmd {
+		case "M", "S":
+			if i+1 < len(tokens) {
+				x, _ := strconv.ParseFloat(tokens[i], 64)
+				y, _ := strconv.ParseFloat(tokens[i+1], 64)
+				tx, ty := point(x, y)
+				p.MoveTo(tx, ty)
+				i += 2
+			}
+		case "L":
+			if i+1 < len(tokens) {
+				x, _ := strconv.ParseFloat(tokens[i], 64)
+				y, _ := strconv.ParseFloat(tokens[i+1], 64)
+				tx, ty := point(x, y)
+				p.LineTo(tx, ty)
+				i += 2
+			}
+		case "B":
+			if i+5 < len(tokens) {
+				x1, _ := strconv.ParseFloat(tokens[i], 64)
+				y1, _ := strconv.ParseFloat(tokens[i+1], 64)
+				x2, _ := strconv.ParseFloat(tokens[i+2], 64)
+				y2, _ := strconv.ParseFloat(tokens[i+3], 64)
+				x3, _ := strconv.ParseFloat(tokens[i+4], 64)
+				y3, _ := strconv.ParseFloat(tokens[i+5], 64)
+				tx1, ty1 := point(x1, y1)
+				tx2, ty2 := point(x2, y2)
+				tx3, ty3 := point(x3, y3)
+				p.CubeTo(tx1, ty1, tx2, ty2, tx3, ty3)
+				i += 6
+			}
+		case "Q":
+			if i+3 < len(tokens) {
+				x1, _ := strconv.ParseFloat(tokens[i], 64)
+				y1, _ := strconv.ParseFloat(tokens[i+1], 64)
+				x2, _ := strconv.ParseFloat(tokens[i+2], 64)
+				y2, _ := strconv.ParseFloat(tokens[i+3], 64)
+				tx1, ty1 := point(x1, y1)
+				tx2, ty2 := point(x2, y2)
+				p.QuadTo(tx1, ty1, tx2, ty2)
+				i += 4
+			}
+		case "A":
+			if i+6 < len(tokens) {
+				rx, _ := strconv.ParseFloat(tokens[i], 64)
+				ry, _ := strconv.ParseFloat(tokens[i+1], 64)
+				rot, _ := strconv.ParseFloat(tokens[i+2], 64)
+				large, _ := strconv.ParseBool(tokens[i+3])
+				sweep, _ := strconv.ParseBool(tokens[i+4])
+				x, _ := strconv.ParseFloat(tokens[i+5], 64)
+				y, _ := strconv.ParseFloat(tokens[i+6], 64)
+				sx := math.Hypot(ctm.a, ctm.c)
+				sy := math.Hypot(ctm.b, ctm.d)
+				ctmRot := math.Atan2(ctm.b, ctm.a) * 180 / math.Pi
+				tx, ty := point(x, y)
+				sweep = !sweep
+				p.ArcTo(rx*sx, ry*sy, -(rot + ctmRot), large, sweep, tx, ty)
+				i += 7
+			}
+		case "C":
+			p.Close()
+		}
+	}
+	return p
+}
+
+// buildClipPath 构建裁剪路径
+// 入参: clips 裁剪对象, pageH 页面高度, bx 边界X坐标, by 边界Y坐标, objectCTM 对象CTM
+// 返回: *canvas.Path 路径对象
+func (r *Renderer) buildClipPath(clips *Clips, pageH float64, bx, by float64, objectCTM Matrix) *canvas.Path {
+	if clips == nil {
+		return nil
+	}
+	var p *canvas.Path
+	for _, clip := range clips.Clip {
+		var clipPath *canvas.Path
+		for _, area := range clip.Area {
+			areaCTM := NewMatrix(area.CTM)
+			if clips.TransFlag == nil || *clips.TransFlag {
+				areaCTM = objectCTM.Multiply(areaCTM)
+			}
+			for _, pathObj := range area.Path {
+				ctm := areaCTM.Multiply(NewMatrix(pathObj.CTM))
+				cp := r.buildPath(pathObj, pageH, ctm, true)
+				cp.Translate(bx, -by)
+				cp.Close()
+				if clipPath == nil {
+					clipPath = cp
+				} else {
+					clipPath = unionClipPath(clipPath, cp)
+				}
+			}
+		}
+		if clipPath != nil {
+			if p == nil {
+				p = clipPath
+			} else {
+				p = intersectClipPath(p, clipPath)
+			}
+		}
+	}
+	return p
+}
+
+// intersectClipPath 求裁剪路径交集
+// 入参: parent 父级裁剪路径, current 当前裁剪路径
+// 返回: *canvas.Path 相交后的裁剪路径
+func intersectClipPath(parent, current *canvas.Path) *canvas.Path {
+	if parent == nil {
+		return current
+	}
+	if current == nil {
+		return parent
+	}
+	parentRect, parentOK := rectangularPath(parent)
+	currentRect, currentOK := rectangularPath(current)
+	if parentOK && currentOK {
+		return parentRect.And(currentRect).ToPath()
+	}
+	if parent.Empty() || current.Empty() {
+		return &canvas.Path{}
+	}
+	if parentOK && parentRect.Contains(current.FastBounds()) {
+		return current
+	}
+	if currentOK && currentRect.Contains(parent.FastBounds()) {
+		return parent
+	}
+	return parent.And(current)
+}
+
+// unionClipPath 合并裁剪区域
+// 入参: left 左侧裁剪路径, right 右侧裁剪路径
+// 返回: *canvas.Path 合并后的裁剪路径
+func unionClipPath(left, right *canvas.Path) *canvas.Path {
+	leftRect, leftOK := rectangularPath(left)
+	rightRect, rightOK := rectangularPath(right)
+	if leftOK && rightOK {
+		bounds := leftRect.Add(rightRect)
+		area := leftRect.Area() + rightRect.Area() - leftRect.And(rightRect).Area()
+		if canvas.Equal(area, bounds.Area()) {
+			return bounds.ToPath()
+		}
+	}
+	return left.Or(right)
+}
+
+// applyClipPath 应用裁剪路径
+// 入参: path 绘制路径, clip 裁剪路径
+// 返回: *canvas.Path 裁剪后的绘制路径
+func applyClipPath(path, clip *canvas.Path) *canvas.Path {
+	if path == nil || clip == nil {
+		return path
+	}
+	if path.Empty() || clip.Empty() {
+		return &canvas.Path{}
+	}
+	if rect, ok := rectangularPath(clip); ok {
+		bounds := path.FastBounds()
+		if rect.Contains(bounds) {
+			return path
+		}
+		if !rect.Overlaps(bounds) {
+			return &canvas.Path{}
+		}
+		if pathRect, ok := rectangularPath(path); ok {
+			return pathRect.And(rect).ToPath()
+		}
+		return path.Flatten(canvas.Tolerance).Clip(rect.X0, rect.Y0, rect.X1, rect.Y1)
+	}
+	return path.And(clip)
+}
+
+// rectangularPath 获取矩形路径区域
+// 入参: path 路径对象
+// 返回: canvas.Rect 矩形区域, bool 是否为矩形
+func rectangularPath(path *canvas.Path) (canvas.Rect, bool) {
+	if path == nil || path.HasSubpaths() || !path.Closed() {
+		return canvas.Rect{}, false
+	}
+	data := path.Data()
+	for i := 0; i < len(data); i += 4 {
+		if i+4 > len(data) || (data[i] != canvas.MoveToCmd && data[i] != canvas.LineToCmd && data[i] != canvas.CloseCmd) {
+			return canvas.Rect{}, false
+		}
+	}
+	points := path.Coords()
+	if len(points) != 5 || !points[0].Equals(points[4]) {
+		return canvas.Rect{}, false
+	}
+	rect := path.FastBounds()
+	corners := 0
+	for _, point := range points[:4] {
+		corner := 0
+		switch {
+		case canvas.Equal(point.X, rect.X0) && canvas.Equal(point.Y, rect.Y0):
+			corner = 1
+		case canvas.Equal(point.X, rect.X1) && canvas.Equal(point.Y, rect.Y0):
+			corner = 2
+		case canvas.Equal(point.X, rect.X1) && canvas.Equal(point.Y, rect.Y1):
+			corner = 4
+		case canvas.Equal(point.X, rect.X0) && canvas.Equal(point.Y, rect.Y1):
+			corner = 8
+		default:
+			return canvas.Rect{}, false
+		}
+		if corners&corner != 0 {
+			return canvas.Rect{}, false
+		}
+		corners |= corner
+	}
+	return rect, corners == 15
+}
+
+// buildTinyFillRectPath 构建微小填充矩形路径
+// 入参: obj 路径对象, pageH 页面高度, ctm 变换矩阵, bx 边界X坐标, by 边界Y坐标
+// 返回: *canvas.Path 路径对象
+func (r *Renderer) buildTinyFillRectPath(obj PathObject, pageH float64, ctm Matrix, bx, by float64) *canvas.Path {
+	if obj.Fill == nil || !*obj.Fill || obj.Stroke == nil || *obj.Stroke {
+		return nil
+	}
+	box, err := ParseBox(obj.Boundary)
+	if err != nil || box.W <= 0 || box.H <= 0 || box.W > 0.6 || box.H > 0.6 {
+		return nil
+	}
+	tokens := strings.Fields(obj.AbbreviatedData)
+	if len(tokens) != 11 || tokens[0] != "M" || tokens[3] != "L" || tokens[6] != "L" || tokens[9] != "L" || tokens[10] != "C" {
+		return nil
+	}
+	points := make([][2]float64, 0, 4)
+	for i := 1; i < 10; i += 3 {
+		x, errX := strconv.ParseFloat(tokens[i], 64)
+		y, errY := strconv.ParseFloat(tokens[i+1], 64)
+		if errX != nil || errY != nil {
+			return nil
+		}
+		tx, ty := ctm.Transform(x, y)
+		points = append(points, [2]float64{tx + bx, pageH - (ty + by)})
+	}
+	minX, maxX := points[0][0], points[0][0]
+	minY, maxY := points[0][1], points[0][1]
+	for _, point := range points[1:] {
+		minX = math.Min(minX, point[0])
+		maxX = math.Max(maxX, point[0])
+		minY = math.Min(minY, point[1])
+		maxY = math.Max(maxY, point[1])
+	}
+	expand := math.Min(box.W, box.H) * 0.08
+	p := &canvas.Path{}
+	p.MoveTo(minX-expand, minY-expand)
+	p.LineTo(maxX+expand, minY-expand)
+	p.LineTo(maxX+expand, maxY+expand)
+	p.LineTo(minX-expand, maxY+expand)
+	p.Close()
+	return p
+}
@@ -0,0 +1,322 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"fmt"
+	"net/url"
+
+	"github.com/tdewolff/canvas"
+	"github.com/tdewolff/canvas/renderers/pdf"
+)
+
+// pdfPage PDF页面数据
+type pdfPage struct {
+	Content *PageContent
+	Box     Box
+}
+
+// pdfNavigation PDF导航信息
+type pdfNavigation struct {
+	Anchor  map[int][]pdfAnchor
+	Link    map[int][]pdfLink
+	Outline map[int][]pdfOutline
+	nextID  int
+}
+
+// pdfAnchor PDF跳转目标
+type pdfAnchor struct {
+	Name string
+	Rect canvas.Rect
+}
+
+// pdfLink PDF链接
+type pdfLink struct {
+	URI  string
+	Rect canvas.Rect
+}
+
+// pdfOutline PDF大纲
+type pdfOutline struct {
+	Name  string
+	Level int
+	Y     float64
+}
+
+// pdfActionSource PDF动作来源
+type pdfActionSource struct {
+	Box     Box
+	Actions []Action
+}
+
+// newPDFNavigation 创建PDF导航信息
+// 入参: renderer 渲染器, doc 文档结构, pages 页面数据
+// 返回: *pdfNavigation PDF导航信息
+func newPDFNavigation(renderer *Renderer, doc *Document, pages []pdfPage) *pdfNavigation {
+	navigation := &pdfNavigation{
+		Anchor:  make(map[int][]pdfAnchor),
+		Link:    make(map[int][]pdfLink),
+		Outline: make(map[int][]pdfOutline),
+	}
+	pageIndex := make(map[string]int, len(pages))
+	for i, page := range pages {
+		pageIndex[page.Content.ID] = i
+	}
+	bookmarks := make(map[string]Dest)
+	if doc != nil {
+		for _, bookmark := range doc.Bookmarks.Bookmark {
+			bookmarks[bookmark.Name] = bookmark.Dest
+		}
+	}
+	for i, page := range pages {
+		sources := pageActionSources(page)
+		if renderer.RenderAnnotations {
+			sources = append(sources, annotationActionSources(renderer.Reader.Annots[page.Content.ID])...)
+		}
+		for _, source := range sources {
+			rect := pdfSourceRect(source.Box, page.Box.H)
+			for _, action := range source.Actions {
+				if action.Event != "CLICK" {
+					continue
+				}
+				navigation.addAction(i, rect, action, bookmarks, pageIndex, pages)
+			}
+		}
+	}
+	if doc != nil {
+		navigation.addOutlines(doc.Outlines.OutlineElem, 0, bookmarks, pageIndex, pages)
+	}
+	return navigation
+}
+
+// addAction 添加PDF动作
+// 入参: page 页面索引, rect 动作区域, action 动作, bookmarks 书签, pageIndex 页面索引表, pages 页面数据
+func (n *pdfNavigation) addAction(page int, rect canvas.Rect, action Action, bookmarks map[string]Dest, pageIndex map[string]int, pages []pdfPage) {
+	if action.Goto != nil {
+		dest := gotoDest(action.Goto, bookmarks)
+		if dest == nil {
+			return
+		}
+		target, ok := pageIndex[dest.PageID]
+		if !ok {
+			return
+		}
+		targetRect, ok := pdfDestRect(*dest, pages[target].Box.H)
+		if !ok {
+			return
+		}
+		name := fmt.Sprintf("ofdgo-dest-%d", n.nextID)
+		n.nextID++
+		n.Anchor[target] = append(n.Anchor[target], pdfAnchor{Name: name, Rect: targetRect})
+		n.Link[page] = append(n.Link[page], pdfLink{URI: "#" + name, Rect: rect})
+		return
+	}
+	if action.URI != nil && action.URI.URI != "" {
+		n.Link[page] = append(n.Link[page], pdfLink{URI: resolveActionURI(*action.URI), Rect: rect})
+	}
+}
+
+// addOutlines 添加PDF大纲
+// 入参: outlines 大纲节点, level 节点层级, bookmarks 书签, pageIndex 页面索引表, pages 页面数据
+func (n *pdfNavigation) addOutlines(outlines []OutlineElem, level int, bookmarks map[string]Dest, pageIndex map[string]int, pages []pdfPage) {
+	for _, outline := range outlines {
+		if dest := outlineDest(outline, bookmarks); dest != nil {
+			if page, ok := pageIndex[dest.PageID]; ok {
+				n.Outline[page] = append(n.Outline[page], pdfOutline{
+					Name:  outline.Title,
+					Level: level,
+					Y:     pdfDestY(*dest, pages[page].Box.H),
+				})
+			}
+		}
+		n.addOutlines(outline.OutlineElem, level+1, bookmarks, pageIndex, pages)
+	}
+}
+
+// apply 应用PDF导航信息
+// 入参: renderer PDF渲染器, page 页面索引
+func (n *pdfNavigation) apply(renderer *pdf.PDF, page int) {
+	for _, anchor := range n.Anchor[page] {
+		renderer.AddAnchor(anchor.Name, anchor.Rect)
+	}
+	for _, link := range n.Link[page] {
+		renderer.AddLink(link.URI, link.Rect)
+	}
+	for _, outline := range n.Outline[page] {
+		renderer.AddOutline(outline.Name, outline.Level, outline.Y)
+	}
+}
+
+// pageActionSources 获取页面动作来源
+// 入参: page 页面数据
+// 返回: []pdfActionSource 动作来源
+func pageActionSources(page pdfPage) []pdfActionSource {
+	sources := make([]pdfActionSource, 0)
+	if len(page.Content.Actions) > 0 {
+		sources = append(sources, pdfActionSource{
+			Box:     Box{W: page.Box.W, H: page.Box.H},
+			Actions: page.Content.Actions,
+		})
+	}
+	for _, layer := range page.Content.Content.Layer {
+		for _, object := range layer.Objects {
+			sources = appendGraphicActionSources(sources, object, nil)
+		}
+	}
+	return sources
+}
+
+// annotationActionSources 获取注释动作来源
+// 入参: annotations 页面注释
+// 返回: []pdfActionSource 动作来源
+func annotationActionSources(annotations []Annotation) []pdfActionSource {
+	sources := make([]pdfActionSource, 0)
+	for _, annotation := range annotations {
+		box, err := ParseBox(annotation.Appearance.Boundary)
+		if err != nil {
+			continue
+		}
+		for _, object := range annotation.Appearance.Objects {
+			sources = appendGraphicActionSources(sources, object, &box)
+		}
+	}
+	return sources
+}
+
+// appendGraphicActionSources 添加图形对象动作来源
+// 入参: sources 动作来源, object 图形对象, box 指定动作区域
+// 返回: []pdfActionSource 动作来源
+func appendGraphicActionSources(sources []pdfActionSource, object GraphicObject, box *Box) []pdfActionSource {
+	var boundary string
+	var actions []Action
+	var children []GraphicObject
+	switch object.Type {
+	case "TextObject":
+		boundary = object.TextObject.Boundary
+		actions = object.TextObject.Actions
+	case "PathObject":
+		boundary = object.PathObject.Boundary
+		actions = object.PathObject.Actions
+	case "ImageObject":
+		boundary = object.ImageObject.Boundary
+		actions = object.ImageObject.Actions
+	case "CompositeGraphicUnit", "CompositeObject":
+		boundary = object.CompositeGraphicUnit.Boundary
+		actions = object.CompositeGraphicUnit.Actions
+		children = object.CompositeGraphicUnit.Objects
+	}
+	sourceBox := box
+	if sourceBox == nil && boundary != "" {
+		if value, err := ParseBox(boundary); err == nil {
+			sourceBox = &value
+		}
+	}
+	if sourceBox != nil && len(actions) > 0 {
+		sources = append(sources, pdfActionSource{Box: *sourceBox, Actions: actions})
+	}
+	for _, child := range children {
+		sources = appendGraphicActionSources(sources, child, box)
+	}
+	return sources
+}
+
+// gotoDest 获取文档内跳转目标
+// 入参: action 跳转动作, bookmarks 书签
+// 返回: *Dest 跳转目标
+func gotoDest(action *Goto, bookmarks map[string]Dest) *Dest {
+	if action.Dest != nil {
+		return action.Dest
+	}
+	if action.Bookmark != nil {
+		if dest, ok := bookmarks[action.Bookmark.Name]; ok {
+			return &dest
+		}
+	}
+	return nil
+}
+
+// outlineDest 获取大纲跳转目标
+// 入参: outline 大纲节点, bookmarks 书签
+// 返回: *Dest 跳转目标
+func outlineDest(outline OutlineElem, bookmarks map[string]Dest) *Dest {
+	for _, action := range outline.Actions {
+		if action.Goto != nil {
+			if dest := gotoDest(action.Goto, bookmarks); dest != nil {
+				return dest
+			}
+		}
+	}
+	for _, child := range outline.OutlineElem {
+		if dest := outlineDest(child, bookmarks); dest != nil {
+			return dest
+		}
+	}
+	return nil
+}
+
+// resolveActionURI 解析URI动作地址
+// 入参: action URI动作
+// 返回: string URI地址
+func resolveActionURI(action URI) string {
+	if action.Base == "" {
+		return action.URI
+	}
+	base, err := url.Parse(action.Base)
+	if err != nil {
+		return action.URI
+	}
+	target, err := url.Parse(action.URI)
+	if err != nil {
+		return action.URI
+	}
+	return base.ResolveReference(target).String()
+}
+
+// pdfSourceRect 转换PDF动作区域
+// 入参: box OFD区域, pageH 页面高度
+// 返回: canvas.Rect PDF区域
+func pdfSourceRect(box Box, pageH float64) canvas.Rect {
+	return canvas.RectFromSize(box.X, pageH-box.Y-box.H, box.W, box.H)
+}
+
+// pdfDestRect 转换PDF跳转目标
+// 入参: dest OFD跳转目标, pageH 页面高度
+// 返回: canvas.Rect PDF目标区域, bool 是否支持
+func pdfDestRect(dest Dest, pageH float64) (canvas.Rect, bool) {
+	switch dest.Type {
+	case "XYZ":
+		return canvas.Rect{X0: dest.Left, Y0: pageH - dest.Top, X1: dest.Left, Y1: pageH - dest.Top}, true
+	case "Fit":
+		return canvas.Rect{}, true
+	case "FitH":
+		return canvas.Rect{Y0: pageH - dest.Top, Y1: pageH - dest.Top}, true
+	case "FitV":
+		return canvas.Rect{X0: dest.Left, X1: dest.Left}, true
+	case "FitR":
+		return canvas.Rect{X0: dest.Left, Y0: pageH - dest.Bottom, X1: dest.Right, Y1: pageH - dest.Top}, true
+	}
+	return canvas.Rect{}, false
+}
+
+// pdfDestY 获取PDF大纲目标位置
+// 入参: dest OFD跳转目标, pageH 页面高度
+// 返回: float64 PDF纵坐标
+func pdfDestY(dest Dest, pageH float64) float64 {
+	switch dest.Type {
+	case "XYZ", "FitH", "FitR":
+		return pageH - dest.Top
+	}
+	return 0
+}
@@ -0,0 +1,172 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"image"
+	"image/color"
+	"image/draw"
+	"math"
+
+	"github.com/tdewolff/canvas"
+	"github.com/tdewolff/canvas/renderers/rasterizer"
+)
+
+// renderStamp 渲染印章
+// 入参: ctx 画布上下文, s 印章对象, pageH 页面高度
+func (r *Renderer) renderStamp(ctx *canvas.Context, s Stamp, pageH float64) {
+	if s.Type == "ofd" && len(s.Data) > 0 {
+		if s.Clip != nil {
+			if img := r.renderOFDStampImage(s.Data); img != nil {
+				r.renderStampImage(ctx, stampImageWithTransparentWhite(img), s, pageH)
+			}
+			return
+		}
+		reader, err := NewReader(bytes.NewReader(s.Data), int64(len(s.Data)))
+		if err == nil {
+			defer reader.Close()
+			doc, err := reader.Doc()
+			if err == nil {
+				renderer := r.childRenderer(reader)
+				for _, pageRef := range doc.Pages.Page {
+					content, err := reader.PageContent(pageRef)
+					if err != nil {
+						continue
+					}
+					sealBox, err := renderer.GetPageBox(content)
+					if err != nil {
+						continue
+					}
+					ctx.Push()
+					ctx.Translate(s.Box.X, pageH-(s.Box.Y+s.Box.H))
+					ctx.Scale(s.Box.W/sealBox.W, s.Box.H/sealBox.H)
+					renderer.renderPageToContext(ctx, content, false)
+					ctx.Pop()
+				}
+				return
+			}
+		}
+	}
+	if len(s.Data) > 0 {
+		img, _, err := decodeImageData(s.Data)
+		if err == nil {
+			if r.decodeImages {
+				img = imagePixelSource(img)
+			}
+			r.renderStampImage(ctx, stampImageWithTransparentWhite(img), s, pageH)
+			return
+		}
+	}
+}
+
+// renderOFDStampImage 渲染OFD印章图像
+// 入参: data OFD印章数据
+// 返回: image.Image 印章图像
+func (r *Renderer) renderOFDStampImage(data []byte) image.Image {
+	reader, err := NewReader(bytes.NewReader(data), int64(len(data)))
+	if err != nil {
+		return nil
+	}
+	defer reader.Close()
+	doc, err := reader.Doc()
+	if err != nil {
+		return nil
+	}
+	renderer := r.childRenderer(reader)
+	renderer.decodeImages = true
+	for _, pageRef := range doc.Pages.Page {
+		content, err := reader.PageContent(pageRef)
+		if err != nil {
+			continue
+		}
+		sealBox, err := renderer.GetPageBox(content)
+		if err != nil {
+			continue
+		}
+		c := canvas.New(sealBox.W, sealBox.H)
+		if err := renderer.renderPageToContext(canvas.NewContext(c), content, false); err != nil {
+			continue
+		}
+		return rasterizer.Draw(c, canvas.DPMM(r.DPI/25.4), canvas.DefaultColorSpace)
+	}
+	return nil
+}
+
+// renderStampImage 渲染印章图像
+// 入参: ctx 画布上下文, img 印章图像, s 印章对象, pageH 页面高度
+func (r *Renderer) renderStampImage(ctx *canvas.Context, img image.Image, s Stamp, pageH float64) {
+	box := s.Box
+	if s.Clip != nil {
+		img = clipStampImage(img, box, *s.Clip)
+		box.X += s.Clip.X
+		box.Y += s.Clip.Y
+		box.W = s.Clip.W
+		box.H = s.Clip.H
+	}
+	ctx.Push()
+	ctx.Translate(box.X, pageH-(box.Y+box.H))
+	ctx.Scale(box.W/float64(img.Bounds().Dx()), box.H/float64(img.Bounds().Dy()))
+	ctx.DrawImage(0, 0, img, canvas.DPMM(1.0))
+	ctx.Pop()
+}
+
+// clipStampImage 裁剪印章图像
+// 入参: img 印章图像, box 印章区域, clip 裁剪区域
+// 返回: image.Image 裁剪后的印章图像
+func clipStampImage(img image.Image, box, clip Box) image.Image {
+	bounds := img.Bounds()
+	x0 := int(math.Floor(clip.X / box.W * float64(bounds.Dx())))
+	y0 := int(math.Floor(clip.Y / box.H * float64(bounds.Dy())))
+	x1 := int(math.Ceil((clip.X + clip.W) / box.W * float64(bounds.Dx())))
+	y1 := int(math.Ceil((clip.Y + clip.H) / box.H * float64(bounds.Dy())))
+	out := image.NewNRGBA(image.Rect(0, 0, x1-x0, y1-y0))
+	draw.Draw(out, out.Bounds(), img, image.Pt(bounds.Min.X+x0, bounds.Min.Y+y0), draw.Src)
+	return out
+}
+
+// stampImageWithTransparentWhite 处理印章图片白色底色
+// 入参: img 印章图片对象
+// 返回: image.Image 处理后的印章图片对象
+func stampImageWithTransparentWhite(img image.Image) image.Image {
+	if opaque, ok := img.(interface{ Opaque() bool }); ok && !opaque.Opaque() {
+		return img
+	}
+	bounds := img.Bounds()
+	out := image.NewNRGBA(bounds)
+	hasAlpha := false
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			c := color.NRGBAModel.Convert(img.At(x, y)).(color.NRGBA)
+			if c.A < 255 {
+				hasAlpha = true
+			}
+			out.SetNRGBA(x, y, c)
+		}
+	}
+	if hasAlpha {
+		return img
+	}
+	for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+		for x := bounds.Min.X; x < bounds.Max.X; x++ {
+			c := out.NRGBAAt(x, y)
+			if c.R >= 250 && c.G >= 250 && c.B >= 250 {
+				c.A = 0
+				out.SetNRGBA(x, y, c)
+			}
+		}
+	}
+	return out
+}
@@ -0,0 +1,283 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"image/color"
+	"strings"
+
+	"github.com/tdewolff/canvas"
+)
+
+const ptPerMM = 72.0 / 25.4
+
+// renderText 渲染文本
+// 入参: ctx 画布上下文, obj 文本对象, pageH 页面高度, defaultFill 默认填充色, defaultStroke 默认描边色, parentCTM 父级CTM, boundaryInCTM 边界是否参与父级CTM, parentClip 父级裁剪路径
+func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64, defaultFill, defaultStroke color.Color, parentCTM *Matrix, boundaryInCTM bool, parentClip *canvas.Path) {
+	if obj.Visible != nil && !*obj.Visible {
+		return
+	}
+	ctx.Push()
+	bx, by := 0.0, 0.0
+	if obj.Boundary != "" {
+		if box, err := ParseBox(obj.Boundary); err == nil {
+			bx, by = box.X, box.Y
+		}
+	}
+	localCTM := NewMatrix(obj.CTM)
+	ctm := localCTM
+	if parentCTM != nil {
+		ctm = parentCTM.Multiply(ctm)
+	}
+	clipPath := intersectClipPath(parentClip, r.buildClipPath(obj.Clips, pageH, bx, by, ctm))
+	var dp *DrawParam
+	if obj.DrawParam != "" {
+		dp = r.getDrawParam(obj.DrawParam, nil)
+	}
+	sizeMM := obj.Size
+	if sizeMM == 0 && dp != nil && dp.Size > 0 {
+		sizeMM = dp.Size
+	}
+	if sizeMM == 0 {
+		sizeMM = 3.5
+	}
+	if obj.VScale != 0 {
+		sizeMM *= obj.VScale
+	}
+	hScale := obj.HScale
+	if hScale == 0 {
+		hScale = 1
+	}
+	useTextMatrix := hasTextMatrix(ctm)
+	if scale := ctm.YScale(); scale > 0 && !useTextMatrix {
+		sizeMM *= scale
+	}
+	sizePt := sizeMM * ptPerMM
+	fillColor := colorWithAlpha(defaultFill, obj.Alpha)
+	if fillColor == nil {
+		fillColor = colorWithAlpha(canvas.Black, obj.Alpha)
+	}
+	var fillPaint any = fillColor
+	var fillColorNode *FillColor
+	if dp != nil && dp.FillColor != nil {
+		fillColorNode = withFillAlpha(dp.FillColor, obj.Alpha)
+		fillColor = parseFillColor(fillColorNode)
+		fillPaint = parseFillPaint(fillColorNode, bx, by, pageH, 0, 0)
+	}
+	if obj.FillColor != nil {
+		fillColorNode = withFillAlpha(obj.FillColor, obj.Alpha)
+		fillColor = parseFillColor(fillColorNode)
+		fillPaint = parseFillPaint(fillColorNode, bx, by, pageH, 0, 0)
+	}
+	if fillPaint == nil {
+		fillPaint = fillColor
+	}
+	fontStyle := canvas.FontRegular
+	weight := obj.Weight
+	if weight == 0 && dp != nil && dp.Weight > 0 {
+		weight = dp.Weight
+	}
+	syntheticBold := weight >= 700
+	italic := obj.Italic
+	if !italic && dp != nil && dp.Italic {
+		italic = true
+	}
+	if italic {
+		fontStyle |= canvas.FontItalic
+	}
+	fontID := r.textObjectFontID(obj)
+	embeddedFont := false
+	if of, ok := r.Reader.fontCache[fontID]; ok {
+		embeddedFont = of.FontFile != ""
+		if !embeddedFont && fontNoSyntheticBold(of.FontName, of.FamilyName) {
+			syntheticBold = false
+		}
+		if of.Bold {
+			fontStyle |= canvas.FontBold
+		}
+		if of.Italic {
+			fontStyle |= canvas.FontItalic
+		}
+	}
+	if syntheticBold {
+		fontStyle |= canvas.FontBold
+	}
+	ff := r.loadFont(fontID)
+	if ff == nil {
+		ctx.Pop()
+		return
+	}
+	face := ff.Face(sizePt, fillPaint, fontStyle, canvas.FontNormal)
+	glyphTransforms := r.textObjectGlyphTransforms(fontID, obj)
+	hasUnderline := strings.Contains(obj.Decoration, "Underline")
+	useGlyphFillPaint := fillColorNode != nil && fillColorNode.AxialShd != nil
+	codePos := 0
+	for _, tc := range obj.TextCode {
+		var runes []rune
+		var glyphs []textGlyph
+		if tc.Index != "" {
+			runes = r.parseIndexRunes(tc.Index, fontID)
+			glyphs = textRuneGlyphs(runes)
+		} else {
+			runes = textCodeRunes(tc.Value)
+			glyphs = textCodeGlyphs(runes, glyphTransforms, codePos)
+		}
+		dxs, dys := parseFloats(tc.DeltaX), parseFloats(tc.DeltaY)
+		xs, ys := parseFloats(tc.X), parseFloats(tc.Y)
+		drawAsPath := embeddedFont || textCodePositioned(tc, xs, ys) || clipPath != nil
+		cx, cy := 0.0, 0.0
+		if len(xs) > 0 {
+			cx = xs[0]
+		}
+		if len(ys) > 0 {
+			cy = ys[0]
+		}
+		for i, glyph := range glyphs {
+			str := glyph.Text
+			drawAsGlyphPath := drawAsPath || glyph.GlyphID >= 0
+			var glyphPath *canvas.Path
+			var glyphWidth float64
+			if drawAsGlyphPath {
+				glyphPath, glyphWidth = r.cachedTextGlyphPath(face, glyph)
+			} else {
+				glyphWidth = textGlyphWidth(face, glyph)
+			}
+			if i < len(xs) {
+				cx = xs[i]
+			} else if i > 0 {
+				if dx, ok := textDelta(dxs, i-1); ok {
+					cx += dx
+				} else if len(dys) == 0 {
+					cx += glyphWidth * hScale
+				}
+			}
+			if i < len(ys) {
+				cy = ys[i]
+			} else if i > 0 {
+				if dy, ok := textDelta(dys, i-1); ok {
+					cy += dy
+				}
+			}
+			var canvasX, canvasY float64
+			if boundaryInCTM && parentCTM != nil {
+				tx, ty := localCTM.Transform(cx, cy)
+				tx, ty = parentCTM.Transform(tx+bx, ty+by)
+				canvasX, canvasY = tx, pageH-ty
+			} else {
+				tx, ty := ctm.Transform(cx, cy)
+				canvasX, canvasY = tx+bx, pageH-(ty+by)
+			}
+			textWidth := glyphWidth * hScale
+			glyphFillPaint := fillPaint
+			if useGlyphFillPaint {
+				glyphFillPaint = parseFillPaint(fillColorNode, bx, by, pageH, canvasX, canvasY)
+			}
+			advanceLimit := textGlyphAdvanceLimit(dxs, dys, xs, i, len(glyphs), cx)
+			if glyphFillPaint != nil {
+				ctx.SetFill(glyphFillPaint)
+				if clipPath != nil {
+					scaleX := hScale
+					if advanceLimit > 0 && glyphWidth*scaleX > advanceLimit {
+						scaleX = advanceLimit / glyphWidth
+					}
+					textWidth = glyphWidth * scaleX
+					textTransform := canvas.Identity.Translate(canvasX, canvasY)
+					if useTextMatrix {
+						textTransform = textTransform.Mul(textMatrix(ctm))
+					}
+					glyphPath = applyClipPath(glyphPath.Copy().Transform(textTransform.Scale(scaleX, 1)), clipPath)
+					ctx.DrawPath(0, 0, glyphPath)
+					if hasUnderline {
+						uw := sizeMM * 0.05
+						off := sizeMM * 0.1
+						underline := &canvas.Path{}
+						underline.MoveTo(0, -off)
+						underline.LineTo(textWidth, -off)
+						underline = underline.Stroke(uw, canvas.ButtCap, canvas.MiterJoin, canvas.Tolerance)
+						underline = applyClipPath(underline.Transform(textTransform), clipPath)
+						ctx.SetFillColor(fillColor)
+						ctx.SetStrokeColor(canvas.Transparent)
+						ctx.DrawPath(0, 0, underline)
+					}
+					continue
+				}
+				drawGlyph := func(x, y float64) {
+					if drawAsGlyphPath {
+						scaleX := hScale
+						if advanceLimit > 0 && glyphWidth*scaleX > advanceLimit {
+							scaleX = advanceLimit / glyphWidth
+						}
+						textWidth = glyphWidth * scaleX
+						if scaleX != 1 {
+							ctx.Push()
+							ctx.Translate(x, y)
+							ctx.Scale(scaleX, 1)
+							ctx.DrawPath(0, 0, glyphPath)
+							ctx.Pop()
+						} else {
+							ctx.DrawPath(x, y, glyphPath)
+						}
+					} else {
+						scaled := hScale != 1
+						if scaled {
+							ctx.Push()
+							ctx.Translate(x, y)
+							ctx.Scale(hScale, 1)
+							x, y = 0, 0
+						}
+						textFace := face
+						if useGlyphFillPaint {
+							textFace = ff.Face(sizePt, glyphFillPaint, fontStyle, canvas.FontNormal)
+						}
+						text := canvas.NewTextLine(textFace, str, canvas.Left)
+						ctx.DrawText(x, y, text)
+						if scaled {
+							ctx.Pop()
+						}
+					}
+				}
+				if useTextMatrix {
+					ctx.Push()
+					ctx.Translate(canvasX, canvasY)
+					ctx.ComposeView(textMatrix(ctm))
+					drawGlyph(0, 0)
+					if hasUnderline {
+						uw := sizeMM * 0.05
+						ctx.SetStrokeWidth(uw)
+						ctx.SetStrokeColor(fillColor)
+						off := sizeMM * 0.1
+						ctx.MoveTo(0, -off)
+						ctx.LineTo(textWidth, -off)
+						ctx.Stroke()
+					}
+					ctx.Pop()
+					continue
+				}
+				drawGlyph(canvasX, canvasY)
+			}
+			if hasUnderline {
+				uw := sizeMM * 0.05
+				ctx.SetStrokeWidth(uw)
+				ctx.SetStrokeColor(fillColor)
+				off := sizeMM * 0.1
+				ctx.MoveTo(canvasX, canvasY-off)
+				ctx.LineTo(canvasX+textWidth, canvasY-off)
+				ctx.Stroke()
+			}
+		}
+		codePos += len(runes)
+	}
+	ctx.Pop()
+}
@@ -104,4 +104,5 @@ type CompositeGraphicUnit struct {
 	ImageObject          []ImageObject          `xml:"ImageObject"`
 	CompositeGraphicUnit []CompositeGraphicUnit `xml:"CompositeGraphicUnit"`
 	Clips                *Clips                 `xml:"Clips"`
+	Actions              []Action               `xml:"Actions>Action"`
 }
@@ -19,20 +19,24 @@ import (
 	"encoding/asn1"
 	"encoding/binary"
 	"encoding/xml"
+	"fmt"
 	"strings"
 )

+// SignType 签名类型
 type SignType string

 const (
-	SignTypeSeal = "Seal"
-	SignTypeSign = "Sign"
+	// SignTypeSeal 印章签名
+	SignTypeSeal SignType = "Seal"
+	// SignTypeSign 数字签名
+	SignTypeSign SignType = "Sign"
 )

 // Signatures 签名列表
 type Signatures struct {
 	XMLName   xml.Name    `xml:"Signatures"`
-	MaxSignId string      `xml:"MaxSignId"`
+	MaxSignID string      `xml:"MaxSignId"`
 	List      []Signature `xml:"Signature"`
 }

@@ -47,16 +51,111 @@ type Signature struct {
 type SignatureFile struct {
 	XMLName     xml.Name `xml:"Signature"`
 	SignedValue string   `xml:"SignedValue"`
-	SignedInfo  struct {
-		Seal struct {
+	SignedInfo  SignedInfo
+}
+
+// SignedInfo 签名信息
+type SignedInfo struct {
+	Provider          SignatureProvider   `xml:"Provider"`
+	SignatureMethod   string              `xml:"SignatureMethod"`
+	SignatureDateTime string              `xml:"SignatureDateTime"`
+	Seal              SignatureSeal       `xml:"Seal"`
+	StampAnnot        []SignatureStamp    `xml:"StampAnnot"`
+	References        SignatureReferences `xml:"References"`
+}
+
+// SignatureProvider 签名提供者信息
+type SignatureProvider struct {
+	ProviderName string `xml:"ProviderName,attr"`
+	Company      string `xml:"Company,attr"`
+	Version      string `xml:"Version,attr"`
+}
+
+// SignatureSeal 签名印章引用
+type SignatureSeal struct {
 	BaseLoc string `xml:"BaseLoc"`
-		} `xml:"Seal"`
-		StampAnnot []struct {
+}
+
+// SignatureStamp 签名印章注释
+type SignatureStamp struct {
 	ID       string `xml:"ID,attr"`
 	PageRef  string `xml:"PageRef,attr"`
 	Boundary string `xml:"Boundary,attr"`
-		} `xml:"StampAnnot"`
-	} `xml:"SignedInfo"`
+	Clip     string `xml:"Clip,attr"`
+}
+
+// SignatureStampPosition 签名外观位置信息
+type SignatureStampPosition struct {
+	ID       string
+	Page     int
+	PageID   string
+	Boundary string
+	Box      Box
+	Clip     string
+	ClipBox  *Box
+}
+
+// SignatureReferences 签名保护文件列表
+type SignatureReferences struct {
+	CheckMethod string               `xml:"CheckMethod,attr"`
+	Reference   []SignatureReference `xml:"Reference"`
+}
+
+// SignatureReference 签名保护文件引用
+type SignatureReference struct {
+	FileRef    string `xml:"FileRef,attr"`
+	CheckValue string `xml:"CheckValue"`
+}
+
+// SignatureStampPositions 获取签名外观位置信息
+// 入参: stamps 签名外观列表
+// 返回: []SignatureStampPosition 签名外观位置信息, error 错误信息
+func (r *Reader) SignatureStampPositions(stamps []SignatureStamp) ([]SignatureStampPosition, error) {
+	doc, err := r.Doc()
+	if err != nil {
+		return nil, err
+	}
+	pages := signaturePageNumbers(doc)
+	positions := make([]SignatureStampPosition, 0, len(stamps))
+	for _, stamp := range stamps {
+		page, ok := pages[stamp.PageRef]
+		if !ok {
+			return nil, fmt.Errorf("signature stamp page not found: %s", stamp.PageRef)
+		}
+		box, err := parseSignatureStampBox(stamp.Boundary)
+		if err != nil {
+			return nil, err
+		}
+		var clipBox *Box
+		if stamp.Clip != "" {
+			clip, err := parseSignatureStampBox(stamp.Clip)
+			if err != nil {
+				return nil, err
+			}
+			clipBox = &clip
+		}
+		positions = append(positions, SignatureStampPosition{
+			ID:       stamp.ID,
+			Page:     page,
+			PageID:   stamp.PageRef,
+			Boundary: stamp.Boundary,
+			Box:      box,
+			Clip:     stamp.Clip,
+			ClipBox:  clipBox,
+		})
+	}
+	return positions, nil
+}
+
+// parseSignatureStampBox 解析签名外观区域
+// 入参: s 区域字符串
+// 返回: Box 矩形对象, error 错误信息
+func parseSignatureStampBox(s string) (Box, error) {
+	box, err := ParseBox(s)
+	if err != nil {
+		return Box{}, fmt.Errorf("invalid signature stamp box: %s", s)
+	}
+	return box, nil
 }

 // parseSignatures 解析签名文件
@@ -99,22 +198,50 @@ func (r *Reader) parseSignatures(doc *Document) error {
 			if len(sealData) == 0 && sigFile.SignedValue != "" {
 				signedValuePath := resolveResourcePath(sigPath, "", sigFile.SignedValue)
 				if data, err := r.ResData(signedValuePath); err == nil {
+					if sig, err := parseSESSignature(data); err == nil {
+						sealType, sealData = sig.Seal.PicType, sig.Seal.PicData
+					} else {
 						sealType, sealData = extractSeal(data)
 					}
 				}
+			}
 			if len(sealData) == 0 {
 				return
 			}
 			for _, annot := range sigFile.SignedInfo.StampAnnot {
 				pageID := annot.PageRef
-				bbox, _ := ParseBox(annot.Boundary)
-				r.addStamp(pageID, bbox, sealType, sealData)
+				bbox, err := parseSignatureStampBox(annot.Boundary)
+				if err != nil {
+					continue
+				}
+				var clipBox *Box
+				if annot.Clip != "" {
+					clip, err := parseSignatureStampBox(annot.Clip)
+					if err != nil {
+						continue
+					}
+					clipBox = &clip
+				}
+				r.addStamp(pageID, bbox, clipBox, sealType, sealData)
 			}
 		}(sigRef)
 	}
 	return nil
 }

+// signaturePageNumbers 获取签名页面编号索引
+// 入参: doc 文档结构
+// 返回: map[string]int 页面编号索引
+func signaturePageNumbers(doc *Document) map[string]int {
+	pages := make(map[string]int, len(doc.Pages.Page))
+	for index, page := range doc.Pages.Page {
+		if page.ID != "" {
+			pages[page.ID] = index + 1
+		}
+	}
+	return pages
+}
+
 // extractSeal 尝试提取印章数据
 // 入参: data 签名值数据
 // 返回: string 印章类型, []byte 印章数据
@@ -297,18 +424,20 @@ func probeImageMedia(data []byte) (string, []byte) {
 // Stamp 印章信息结构
 type Stamp struct {
 	Box  Box
+	Clip *Box
 	Type string
 	Data []byte
 }

 // addStamp 添加印章到页面
-// 入参: pageID 页面ID, box 印章区域, sType 印章类型, data 印章数据
-func (r *Reader) addStamp(pageID string, box Box, sType string, data []byte) {
+// 入参: pageID 页面ID, box 印章区域, clip 裁剪区域, sType 印章类型, data 印章数据
+func (r *Reader) addStamp(pageID string, box Box, clip *Box, sType string, data []byte) {
 	if r.Stamps == nil {
 		r.Stamps = make(map[string][]Stamp)
 	}
 	r.Stamps[pageID] = append(r.Stamps[pageID], Stamp{
 		Box:  box,
+		Clip: clip,
 		Type: sType,
 		Data: data,
 	})
@@ -0,0 +1,639 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"encoding/asn1"
+	"fmt"
+	"math/big"
+)
+
+const (
+	signContentData       = "1.2.156.10197.6.1.4.2.1"
+	signContentSignedData = "1.2.156.10197.6.1.4.2.2"
+	signAttrMessageDigest = "1.2.840.113549.1.9.4"
+)
+
+// digitalVerifyResult 数字签名验证结果
+type digitalVerifyResult struct {
+	DataHashOK  bool
+	SignedOK    bool
+	CertOK      bool
+	SignerCerts [][]byte
+	Certs       [][]byte
+	CertInfo    SignatureCertInfo
+}
+
+// gbtSignedData GB/T 35275 SignedData结构
+type gbtSignedData struct {
+	ContentDigest []byte
+	Certs         []gbtCertificate
+	Signers       []gbtSignerInfo
+}
+
+// gbtCertificate SignedData证书索引信息
+type gbtCertificate struct {
+	Raw    []byte
+	Issuer []byte
+	Serial *big.Int
+}
+
+// gbtSignerInfo SignedData签名者信息
+type gbtSignerInfo struct {
+	Issuer       []byte
+	Serial       *big.Int
+	DigestAlg    string
+	SignatureAlg string
+	Signature    []byte
+	AuthAttrs    []byte
+	AttrDigest   []byte
+}
+
+// verifyDigitalSignature 验证OFD数字签名
+// 入参: method 签名算法, digestMethod 摘要算法, signedValue 签名值, signedData 被签名原文, options 验证选项
+// 返回: *digitalVerifyResult 验证结果, error 错误信息
+func verifyDigitalSignature(method, digestMethod string, signedValue, signedData []byte, options *signatureVerifyOptions) (*digitalVerifyResult, error) {
+	if value, ok := normalizeGBT35275SignedValue(signedValue); ok {
+		return verifyGBT35275SignedData(value, signedData, options)
+	}
+	if isSM2SignatureMethod(method) {
+		return verifyRawDigitalSignature(signedValue, signedData, options)
+	}
+	if isRSASignatureMethod(method) || isECDSASignatureMethod(method) {
+		return verifyRawPublicKeySignature(method, digestMethod, signedValue, signedData, options)
+	}
+	return nil, fmt.Errorf("unsupported signature method: %s", method)
+}
+
+// verifyRawDigitalSignature 验证裸SM2数字签名
+// 入参: signedValue 签名值, signedData 被签名原文, options 验证选项
+// 返回: *digitalVerifyResult 验证结果, error 错误信息
+func verifyRawDigitalSignature(signedValue, signedData []byte, options *signatureVerifyOptions) (*digitalVerifyResult, error) {
+	if len(options.SignCerts) == 0 {
+		return nil, fmt.Errorf("signature certificate not found")
+	}
+	result := &digitalVerifyResult{DataHashOK: true}
+	for _, cert := range options.SignCerts {
+		pub, err := parseSM2PublicKeyFromCert(cert)
+		if err != nil {
+			continue
+		}
+		result.CertOK = true
+		result.SignerCerts = [][]byte{cert}
+		result.CertInfo = signatureCertInfo(cert)
+		if sm2VerifySignature(pub, nil, signedData, signedValue) {
+			result.SignedOK = true
+			return result, nil
+		}
+	}
+	return result, nil
+}
+
+// verifyRawPublicKeySignature 验证裸RSA或ECDSA数字签名
+// 入参: method 签名算法, digestMethod 摘要算法, signedValue 签名值, signedData 被签名原文, options 验证选项
+// 返回: *digitalVerifyResult 验证结果, error 错误信息
+func verifyRawPublicKeySignature(method, digestMethod string, signedValue, signedData []byte, options *signatureVerifyOptions) (*digitalVerifyResult, error) {
+	if len(options.SignCerts) == 0 {
+		return nil, fmt.Errorf("signature certificate not found")
+	}
+	if _, err := signatureMethodHash(method, digestMethod); err != nil {
+		return nil, err
+	}
+	result := &digitalVerifyResult{DataHashOK: true}
+	for _, cert := range options.SignCerts {
+		ok, err := verifyPublicKeySignature(method, digestMethod, cert, signedData, signedValue)
+		if err != nil {
+			continue
+		}
+		result.CertOK = true
+		result.SignerCerts = [][]byte{cert}
+		result.CertInfo = signatureCertInfo(cert)
+		if ok {
+			result.SignedOK = true
+			return result, nil
+		}
+	}
+	return result, nil
+}
+
+// verifyGBT35275SignedData 验证GB/T 35275 SignedData签名值
+// 入参: signedValue 签名值, signedData 被签名原文, options 验证选项
+// 返回: *digitalVerifyResult 验证结果, error 错误信息
+func verifyGBT35275SignedData(signedValue, signedData []byte, options *signatureVerifyOptions) (*digitalVerifyResult, error) {
+	sd, err := parseGBT35275SignedData(signedValue)
+	if err != nil {
+		return nil, err
+	}
+	for _, cert := range options.SignCerts {
+		c, err := parseGBTCertificate(cert)
+		if err == nil {
+			sd.Certs = append(sd.Certs, c)
+		}
+	}
+	if len(sd.Signers) == 0 {
+		return nil, fmt.Errorf("invalid signed data signer info")
+	}
+	result := &digitalVerifyResult{Certs: sd.rawCerts()}
+	for _, signer := range sd.Signers {
+		digest, err := signatureDigest(signer.DigestAlg, signedData)
+		if err != nil {
+			return nil, err
+		}
+		if len(sd.ContentDigest) != 0 && !bytes.Equal(sd.ContentDigest, digest) {
+			return result, nil
+		}
+		result.DataHashOK = true
+		plain := sd.ContentDigest
+		if len(signer.AuthAttrs) != 0 {
+			if !bytes.Equal(signer.AttrDigest, digest) {
+				result.DataHashOK = false
+				return result, nil
+			}
+			plain = signer.AuthAttrs
+		}
+		if len(plain) == 0 {
+			return nil, fmt.Errorf("invalid signed data content")
+		}
+		cert := sd.findCert(signer.Issuer, signer.Serial)
+		if cert == nil {
+			result.CertOK = false
+			return result, nil
+		}
+		result.SignerCerts = append(result.SignerCerts, cert.Raw)
+		result.CertInfo = signatureCertInfo(cert.Raw)
+		if isSM2SignatureMethod(signer.SignatureAlg) {
+			pub, err := parseSM2PublicKeyFromCert(cert.Raw)
+			if err != nil {
+				result.CertOK = false
+				return result, err
+			}
+			if !sm2VerifySignature(pub, nil, plain, signer.Signature) {
+				result.CertOK = true
+				return result, nil
+			}
+			continue
+		}
+		if !isRSASignatureMethod(signer.SignatureAlg) && !isECDSASignatureMethod(signer.SignatureAlg) {
+			return nil, fmt.Errorf("unsupported signature method: %s", signer.SignatureAlg)
+		}
+		ok, err := verifyPublicKeySignature(signer.SignatureAlg, signer.DigestAlg, cert.Raw, plain, signer.Signature)
+		if err != nil {
+			result.CertOK = false
+			return result, err
+		}
+		if !ok {
+			result.CertOK = true
+			return result, nil
+		}
+	}
+	result.CertOK = true
+	result.SignedOK = true
+	return result, nil
+}
+
+// normalizeGBT35275SignedValue 规范化GB/T 35275 SignedData编码
+// 入参: data 签名值数据
+// 返回: []byte 定长编码数据, bool 是否为SignedData
+func normalizeGBT35275SignedValue(data []byte) ([]byte, bool) {
+	if contentType, ok := gbtContentType(data); ok {
+		return data, contentType == signContentSignedData
+	}
+	der, err := berToDefinite(data)
+	if err != nil {
+		return nil, false
+	}
+	contentType, ok := gbtContentType(der)
+	if !ok || contentType != signContentSignedData {
+		return nil, false
+	}
+	return der, true
+}
+
+// gbtContentType 读取GB/T 35275内容类型
+// 入参: data DER编码数据
+// 返回: string 内容类型, bool 是否完成解析
+func gbtContentType(data []byte) (string, bool) {
+	var root asn1.RawValue
+	rest, err := asn1.Unmarshal(data, &root)
+	if err != nil || len(rest) != 0 || root.Tag != signASN1Sequence {
+		return "", false
+	}
+	items, ok := asn1Children(root.Bytes)
+	if !ok || len(items) == 0 {
+		return "", false
+	}
+	if items[0].Tag != asn1.TagOID {
+		return "", true
+	}
+	oid, err := asn1OIDString(items[0])
+	return oid, err == nil
+}
+
+// berToDefinite 将BER不定长编码转换为定长编码
+// 入参: data BER编码数据
+// 返回: []byte 定长编码数据, error 错误信息
+func berToDefinite(data []byte) ([]byte, error) {
+	out, n, err := berValueToDefinite(data)
+	if err != nil {
+		return nil, err
+	}
+	if n != len(data) {
+		return nil, fmt.Errorf("invalid BER trailing data")
+	}
+	return out, nil
+}
+
+// berValueToDefinite 转换单个BER编码值
+// 入参: data BER编码数据
+// 返回: []byte 定长编码数据, int 已读取长度, error 错误信息
+func berValueToDefinite(data []byte) ([]byte, int, error) {
+	if len(data) < 2 {
+		return nil, 0, fmt.Errorf("invalid BER value")
+	}
+	pos := 1
+	if data[0]&0x1f == 0x1f {
+		for pos < len(data) && data[pos]&0x80 != 0 {
+			pos++
+		}
+		pos++
+	}
+	if pos >= len(data) {
+		return nil, 0, fmt.Errorf("invalid BER tag")
+	}
+	tag := data[:pos]
+	firstLength := data[pos]
+	pos++
+	if firstLength == 0x80 {
+		if tag[0]&0x20 == 0 {
+			return nil, 0, fmt.Errorf("invalid BER indefinite primitive")
+		}
+		var content []byte
+		for {
+			if len(data)-pos < 2 {
+				return nil, 0, fmt.Errorf("invalid BER unterminated value")
+			}
+			if data[pos] == 0 && data[pos+1] == 0 {
+				pos += 2
+				break
+			}
+			child, n, err := berValueToDefinite(data[pos:])
+			if err != nil {
+				return nil, 0, err
+			}
+			content = append(content, child...)
+			pos += n
+		}
+		return wrapBERValue(tag, content), pos, nil
+	}
+	length := uint64(firstLength)
+	if firstLength&0x80 != 0 {
+		n := int(firstLength & 0x7f)
+		if n == 0 || n > 8 || len(data)-pos < n {
+			return nil, 0, fmt.Errorf("invalid BER length")
+		}
+		length = 0
+		for _, b := range data[pos : pos+n] {
+			length = length<<8 | uint64(b)
+		}
+		pos += n
+	}
+	if length > uint64(len(data)-pos) {
+		return nil, 0, fmt.Errorf("invalid BER truncated value")
+	}
+	end := pos + int(length)
+	content := append([]byte(nil), data[pos:end]...)
+	if tag[0]&0x20 != 0 {
+		content = content[:0]
+		for pos < end {
+			child, n, err := berValueToDefinite(data[pos:end])
+			if err != nil {
+				return nil, 0, err
+			}
+			content = append(content, child...)
+			pos += n
+		}
+	}
+	return wrapBERValue(tag, content), end, nil
+}
+
+// wrapBERValue 包装定长BER编码值
+// 入参: tag 标签, content 内容
+// 返回: []byte 定长编码数据
+func wrapBERValue(tag, content []byte) []byte {
+	out := make([]byte, 0, len(tag)+len(content)+9)
+	out = append(out, tag...)
+	out = append(out, asn1LengthBytes(len(content))...)
+	return append(out, content...)
+}
+
+// parseGBT35275SignedData 解析GB/T 35275 SignedData
+// 入参: data 签名值数据
+// 返回: *gbtSignedData SignedData结构, error 错误信息
+func parseGBT35275SignedData(data []byte) (*gbtSignedData, error) {
+	var ok bool
+	data, ok = normalizeGBT35275SignedValue(data)
+	if !ok {
+		return nil, fmt.Errorf("invalid signed data content type")
+	}
+	contentType, content, ok, err := parseGBTContentInfoBytes(data)
+	if err != nil {
+		return nil, err
+	}
+	if !ok || contentType != signContentSignedData {
+		return nil, fmt.Errorf("invalid signed data content type")
+	}
+	items, ok := asn1Children(content.Bytes)
+	if !ok || len(items) < 4 {
+		return nil, fmt.Errorf("invalid signed data")
+	}
+	sd := &gbtSignedData{}
+	contentOID, content, hasContent, err := parseGBTContentInfo(items[2])
+	if err != nil {
+		return nil, err
+	}
+	if hasContent {
+		if contentOID != signContentData {
+			return nil, fmt.Errorf("invalid signed data inner content type")
+		}
+		if content.Tag == asn1.TagOctetString {
+			sd.ContentDigest, err = asn1OctetString(content)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+	for i := 3; i < len(items); i++ {
+		item := items[i]
+		if item.Class == asn1.ClassContextSpecific && item.Tag == 0 {
+			certs, err := parseGBTCertificates(item)
+			if err != nil {
+				return nil, err
+			}
+			sd.Certs = certs
+			continue
+		}
+		if item.Class == asn1.ClassContextSpecific && item.Tag == 1 {
+			continue
+		}
+		signers, err := parseGBTSignerInfos(item)
+		if err != nil {
+			return nil, err
+		}
+		sd.Signers = signers
+	}
+	return sd, nil
+}
+
+// parseGBTContentInfoBytes 解析ContentInfo字节
+// 入参: data DER编码数据
+// 返回: string 内容类型, asn1.RawValue 内容, bool 是否存在内容, error 错误信息
+func parseGBTContentInfoBytes(data []byte) (string, asn1.RawValue, bool, error) {
+	var raw asn1.RawValue
+	rest, err := asn1.Unmarshal(data, &raw)
+	if err != nil || len(rest) != 0 {
+		return "", asn1.RawValue{}, false, fmt.Errorf("invalid content info")
+	}
+	return parseGBTContentInfo(raw)
+}
+
+// parseGBTContentInfo 解析ContentInfo结构
+// 入参: raw ASN.1原始值
+// 返回: string 内容类型, asn1.RawValue 内容, bool 是否存在内容, error 错误信息
+func parseGBTContentInfo(raw asn1.RawValue) (string, asn1.RawValue, bool, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) == 0 {
+		return "", asn1.RawValue{}, false, fmt.Errorf("invalid content info")
+	}
+	oid, err := asn1OIDString(items[0])
+	if err != nil {
+		return "", asn1.RawValue{}, false, err
+	}
+	if len(items) == 1 {
+		return oid, asn1.RawValue{}, false, nil
+	}
+	content, err := asn1Explicit(items[1])
+	if err != nil {
+		return "", asn1.RawValue{}, false, err
+	}
+	return oid, content, true, nil
+}
+
+// parseGBTCertificates 解析SignedData证书集合
+// 入参: raw ASN.1原始值
+// 返回: []gbtCertificate 证书列表, error 错误信息
+func parseGBTCertificates(raw asn1.RawValue) ([]gbtCertificate, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok {
+		return nil, fmt.Errorf("invalid signed data certificates")
+	}
+	certs := make([]gbtCertificate, 0, len(items))
+	for _, item := range items {
+		cert, err := parseGBTCertificate(item.FullBytes)
+		if err != nil {
+			return nil, err
+		}
+		certs = append(certs, cert)
+	}
+	return certs, nil
+}
+
+// parseGBTCertificate 解析X.509证书索引字段
+// 入参: data DER编码证书
+// 返回: gbtCertificate 证书索引信息, error 错误信息
+func parseGBTCertificate(data []byte) (gbtCertificate, error) {
+	cert, err := parseSignatureCertificate(data)
+	if err != nil {
+		return gbtCertificate{}, err
+	}
+	return gbtCertificate{
+		Raw:    cert.Raw,
+		Issuer: cert.Issuer,
+		Serial: cert.Serial,
+	}, nil
+}
+
+// parseGBTSignerInfos 解析签名者信息集合
+// 入参: raw ASN.1原始值
+// 返回: []gbtSignerInfo 签名者列表, error 错误信息
+func parseGBTSignerInfos(raw asn1.RawValue) ([]gbtSignerInfo, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok {
+		return nil, fmt.Errorf("invalid signer infos")
+	}
+	signers := make([]gbtSignerInfo, 0, len(items))
+	for _, item := range items {
+		signer, err := parseGBTSignerInfo(item)
+		if err != nil {
+			return nil, err
+		}
+		signers = append(signers, signer)
+	}
+	return signers, nil
+}
+
+// parseGBTSignerInfo 解析签名者信息
+// 入参: raw ASN.1原始值
+// 返回: gbtSignerInfo 签名者信息, error 错误信息
+func parseGBTSignerInfo(raw asn1.RawValue) (gbtSignerInfo, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) < 5 {
+		return gbtSignerInfo{}, fmt.Errorf("invalid signer info")
+	}
+	issuer, serial, err := parseGBTIssuerAndSerial(items[1])
+	if err != nil {
+		return gbtSignerInfo{}, err
+	}
+	digestAlg, err := parseGBTAlgorithm(items[2])
+	if err != nil {
+		return gbtSignerInfo{}, err
+	}
+	idx := 3
+	var authAttrs []byte
+	var attrDigest []byte
+	if items[idx].Class == asn1.ClassContextSpecific && items[idx].Tag == 0 {
+		authAttrs = asn1SetBytes(items[idx].Bytes)
+		attrDigest, err = parseGBTMessageDigestAttr(items[idx])
+		if err != nil {
+			return gbtSignerInfo{}, err
+		}
+		idx++
+	}
+	if len(items) <= idx+1 {
+		return gbtSignerInfo{}, fmt.Errorf("invalid signer info")
+	}
+	signatureAlg, err := parseGBTAlgorithm(items[idx])
+	if err != nil {
+		return gbtSignerInfo{}, err
+	}
+	signature, err := asn1OctetString(items[idx+1])
+	if err != nil {
+		return gbtSignerInfo{}, err
+	}
+	return gbtSignerInfo{
+		Issuer:       issuer,
+		Serial:       serial,
+		DigestAlg:    digestAlg,
+		SignatureAlg: signatureAlg,
+		Signature:    signature,
+		AuthAttrs:    authAttrs,
+		AttrDigest:   attrDigest,
+	}, nil
+}
+
+// parseGBTIssuerAndSerial 解析证书颁发者和序列号
+// 入参: raw ASN.1原始值
+// 返回: []byte 颁发者DN, *big.Int 序列号, error 错误信息
+func parseGBTIssuerAndSerial(raw asn1.RawValue) ([]byte, *big.Int, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) < 2 {
+		return nil, nil, fmt.Errorf("invalid issuer and serial")
+	}
+	serial, err := asn1IntegerBig(items[1])
+	if err != nil {
+		return nil, nil, err
+	}
+	return append([]byte(nil), items[0].FullBytes...), serial, nil
+}
+
+// parseGBTAlgorithm 解析算法标识
+// 入参: raw ASN.1原始值
+// 返回: string 算法OID, error 错误信息
+func parseGBTAlgorithm(raw asn1.RawValue) (string, error) {
+	if raw.Tag == asn1.TagOID {
+		return asn1OIDString(raw)
+	}
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) == 0 {
+		return "", fmt.Errorf("invalid algorithm identifier")
+	}
+	return asn1OIDString(items[0])
+}
+
+// parseGBTMessageDigestAttr 解析认证属性中的message-digest
+// 入参: raw ASN.1原始值
+// 返回: []byte 摘要值, error 错误信息
+func parseGBTMessageDigestAttr(raw asn1.RawValue) ([]byte, error) {
+	attrs, ok := asn1Children(raw.Bytes)
+	if !ok {
+		return nil, fmt.Errorf("invalid authenticated attributes")
+	}
+	for _, attr := range attrs {
+		items, ok := asn1Children(attr.Bytes)
+		if !ok || len(items) < 2 {
+			continue
+		}
+		oid, err := asn1OIDString(items[0])
+		if err != nil || oid != signAttrMessageDigest {
+			continue
+		}
+		values, ok := asn1Children(items[1].Bytes)
+		if !ok || len(values) == 0 {
+			return nil, fmt.Errorf("invalid message digest attribute")
+		}
+		return asn1OctetString(values[0])
+	}
+	return nil, fmt.Errorf("message digest attribute not found")
+}
+
+// findCert 查找签名者证书
+// 入参: issuer 颁发者DN, serial 证书序列号
+// 返回: *gbtCertificate 证书信息
+func (sd *gbtSignedData) findCert(issuer []byte, serial *big.Int) *gbtCertificate {
+	for i := range sd.Certs {
+		cert := &sd.Certs[i]
+		if bytes.Equal(cert.Issuer, issuer) && cert.Serial.Cmp(serial) == 0 {
+			return cert
+		}
+	}
+	return nil
+}
+
+// rawCerts 获取SignedData证书原文
+// 返回: [][]byte 证书列表
+func (sd *gbtSignedData) rawCerts() [][]byte {
+	certs := make([][]byte, 0, len(sd.Certs))
+	for _, cert := range sd.Certs {
+		certs = append(certs, cert.Raw)
+	}
+	return certs
+}
+
+// asn1Explicit 解析显式标签内容
+// 入参: raw ASN.1原始值
+// 返回: asn1.RawValue 标签内容, error 错误信息
+func asn1Explicit(raw asn1.RawValue) (asn1.RawValue, error) {
+	if raw.Class != asn1.ClassContextSpecific || raw.Tag != 0 || !raw.IsCompound {
+		return asn1.RawValue{}, fmt.Errorf("invalid explicit content")
+	}
+	var out asn1.RawValue
+	rest, err := asn1.Unmarshal(raw.Bytes, &out)
+	if err != nil || len(rest) != 0 {
+		return asn1.RawValue{}, fmt.Errorf("invalid explicit content")
+	}
+	return out, nil
+}
+
+// asn1IntegerBig 解析ASN.1整数
+// 入参: raw ASN.1原始值
+// 返回: *big.Int 整数值, error 错误信息
+func asn1IntegerBig(raw asn1.RawValue) (*big.Int, error) {
+	var out *big.Int
+	rest, err := asn1.Unmarshal(raw.FullBytes, &out)
+	if err != nil || len(rest) != 0 || out == nil {
+		return nil, fmt.Errorf("invalid integer")
+	}
+	return out, nil
+}
@@ -0,0 +1,742 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"encoding/asn1"
+	"fmt"
+	"math/big"
+	"strings"
+	"time"
+)
+
+const (
+	signDigestSM3      = "1.2.156.10197.1.401"
+	signDigestSM3NoKey = "1.2.156.10197.1.401.1"
+	signDigestSM3Key   = "1.2.156.10197.1.401.2"
+	signMethodSM2SM3   = "1.2.156.10197.1.501"
+	signMethodSM2SM3B  = "1.2.156.10197.501"
+	signMethodSM2Sign  = "1.2.156.10197.1.301.1"
+	signCurveSM2P256   = "1.2.156.10197.1.301"
+	signECPublicKey    = "1.2.840.10045.2.1"
+	signASN1Sequence   = 16
+	signPublicKeySize  = 65
+)
+
+// sesSignature SES签章值
+type sesSignature struct {
+	ToSign    []byte
+	Cert      []byte
+	SignAlg   string
+	Signature []byte
+	DataHash  []byte
+	Time      time.Time
+	Seal      *sesSeal
+}
+
+// sesSeal SES电子印章
+type sesSeal struct {
+	Raw       []byte
+	SignData  []byte
+	Cert      []byte
+	SignAlg   string
+	Signature []byte
+	PicType   string
+	PicData   []byte
+	CertList  sesCertList
+	Info      SignatureSealInfo
+}
+
+// sesCertList SES印章证书列表
+type sesCertList struct {
+	Certs   [][]byte
+	Digests []sesCertDigest
+}
+
+// sesCertDigest SES印章证书摘要
+type sesCertDigest struct {
+	Method string
+	Value  []byte
+}
+
+// sesVerifyResult SES签章验证结果
+type sesVerifyResult struct {
+	DataHashOK    bool
+	SignedOK      bool
+	SealOK        bool
+	CertOK        bool
+	SignCert      SignatureCertInfo
+	SealCert      SignatureCertInfo
+	SignCertRaw   []byte
+	SealCertRaw   []byte
+	SealRaw       []byte
+	Certs         [][]byte
+	SealType      string
+	SealInfo      SignatureSealInfo
+	SignatureTime time.Time
+}
+
+// parseSESSignature 解析SES签章值
+// 入参: data 签章值数据
+// 返回: *sesSignature SES签章值, error 错误信息
+func parseSESSignature(data []byte) (*sesSignature, error) {
+	var root asn1.RawValue
+	rest, err := asn1.Unmarshal(data, &root)
+	if err != nil {
+		return nil, err
+	}
+	if len(rest) != 0 || root.Tag != signASN1Sequence || !root.IsCompound {
+		return nil, fmt.Errorf("invalid ses signature")
+	}
+	items, ok := asn1Children(root.Bytes)
+	if !ok {
+		return nil, fmt.Errorf("invalid ses signature items")
+	}
+	if len(items) == 2 {
+		return parseSESSignatureV1(items)
+	}
+	if len(items) < 4 || len(items) > 5 {
+		return nil, fmt.Errorf("invalid ses signature items")
+	}
+	cert, err := asn1OctetString(items[1])
+	if err != nil {
+		return nil, err
+	}
+	alg, err := asn1OIDString(items[2])
+	if err != nil {
+		return nil, err
+	}
+	signature, err := asn1BitStringBytes(items[3])
+	if err != nil {
+		return nil, err
+	}
+	tbsItems, ok := asn1Children(items[0].Bytes)
+	if !ok || len(tbsItems) < 5 || len(tbsItems) > 6 {
+		return nil, fmt.Errorf("invalid ses toSign")
+	}
+	seal, err := parseSESSeal(tbsItems[1])
+	if err != nil {
+		return nil, err
+	}
+	version, err := asn1Integer(tbsItems[0])
+	if err != nil || version != seal.Info.Version {
+		return nil, fmt.Errorf("invalid ses version")
+	}
+	signatureTime, err := asn1Time(tbsItems[2])
+	if err != nil {
+		return nil, err
+	}
+	dataHash, err := asn1BitOrOctetBytes(tbsItems[3])
+	if err != nil {
+		return nil, err
+	}
+	return &sesSignature{
+		ToSign:    append([]byte(nil), items[0].FullBytes...),
+		Cert:      cert,
+		SignAlg:   alg,
+		Signature: signature,
+		DataHash:  dataHash,
+		Time:      signatureTime,
+		Seal:      seal,
+	}, nil
+}
+
+// parseSESSignatureV1 解析SES V1签章值
+// 入参: items ASN.1子元素
+// 返回: *sesSignature SES签章值, error 错误信息
+func parseSESSignatureV1(items []asn1.RawValue) (*sesSignature, error) {
+	signature, err := asn1BitStringBytes(items[1])
+	if err != nil {
+		return nil, err
+	}
+	tbsItems, ok := asn1Children(items[0].Bytes)
+	if !ok || len(tbsItems) != 7 {
+		return nil, fmt.Errorf("invalid ses v1 toSign")
+	}
+	seal, err := parseSESSeal(tbsItems[1])
+	if err != nil {
+		return nil, err
+	}
+	version, err := asn1Integer(tbsItems[0])
+	if err != nil || version != seal.Info.Version {
+		return nil, fmt.Errorf("invalid ses version")
+	}
+	signatureTime := parseSESSignatureTimeV1(tbsItems[2])
+	dataHash, err := asn1BitOrOctetBytes(tbsItems[3])
+	if err != nil {
+		return nil, err
+	}
+	cert, err := asn1OctetString(tbsItems[5])
+	if err != nil {
+		return nil, err
+	}
+	alg, err := asn1OIDString(tbsItems[6])
+	if err != nil {
+		return nil, err
+	}
+	return &sesSignature{
+		ToSign:    append([]byte(nil), items[0].FullBytes...),
+		Cert:      cert,
+		SignAlg:   alg,
+		Signature: signature,
+		DataHash:  dataHash,
+		Time:      signatureTime,
+		Seal:      seal,
+	}, nil
+}
+
+// parseSESSignatureTimeV1 解析SES V1签名时间
+// 入参: raw 签名时间或时间戳数据
+// 返回: time.Time 签名时间
+func parseSESSignatureTimeV1(raw asn1.RawValue) time.Time {
+	data, err := asn1BitOrOctetBytes(raw)
+	if err != nil {
+		return time.Time{}
+	}
+	if t := parseSignatureDateTime(string(data)); !t.IsZero() {
+		return t
+	}
+	var value asn1.RawValue
+	rest, err := asn1.Unmarshal(data, &value)
+	if err != nil || len(rest) != 0 {
+		return time.Time{}
+	}
+	t, _ := asn1Time(value)
+	return t
+}
+
+// verifySESSignature 验证SES签章值
+// 入参: data 签章值数据, signedData 被签名数据原文, options 验证选项
+// 返回: *sesVerifyResult 验证结果, error 错误信息
+func verifySESSignature(data, signedData []byte, options *signatureVerifyOptions) (*sesVerifyResult, error) {
+	sig, err := parseSESSignature(data)
+	if err != nil {
+		return nil, err
+	}
+	if !isSM2SignatureMethod(sig.SignAlg) || !isSM2SignatureMethod(sig.Seal.SignAlg) {
+		return nil, fmt.Errorf("unsupported signature method")
+	}
+	result := &sesVerifyResult{}
+	result.SignCert = signatureCertInfo(sig.Cert)
+	result.SealCert = signatureCertInfo(sig.Seal.Cert)
+	result.SignCertRaw = sig.Cert
+	result.SealCertRaw = sig.Seal.Cert
+	result.SealRaw = sig.Seal.Raw
+	result.Certs = append(result.Certs, sig.Seal.CertList.Certs...)
+	result.Certs = append(result.Certs, options.SignCerts...)
+	result.SealType = sig.Seal.PicType
+	result.SealInfo = sig.Seal.Info
+	result.SignatureTime = sig.Time
+	result.DataHashOK = bytes.Equal(sig.DataHash, signSM3(signedData))
+	signPub, err := parseSM2PublicKeyFromCert(sig.Cert)
+	if err != nil {
+		return result, err
+	}
+	sealPub, err := parseSM2PublicKeyFromCert(sig.Seal.Cert)
+	if err != nil {
+		return result, err
+	}
+	result.SignedOK = sm2VerifySignature(signPub, nil, sig.ToSign, sig.Signature)
+	result.SealOK = sm2VerifySignature(sealPub, nil, sig.Seal.SignData, sig.Seal.Signature)
+	result.CertOK = sesCertInList(sig.Cert, sig.Seal.CertList)
+	return result, nil
+}
+
+// parseSESSeal 解析SES电子印章
+// 入参: raw ASN.1原始值
+// 返回: *sesSeal SES电子印章, error 错误信息
+func parseSESSeal(raw asn1.RawValue) (*sesSeal, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok {
+		return nil, fmt.Errorf("invalid ses seal")
+	}
+	if len(items) == 2 {
+		return parseSESSealV1(raw, items)
+	}
+	if len(items) < 4 || len(items) > 5 {
+		return nil, fmt.Errorf("invalid ses seal")
+	}
+	cert, err := asn1OctetString(items[1])
+	if err != nil {
+		return nil, err
+	}
+	alg, err := asn1OIDString(items[2])
+	if err != nil {
+		return nil, err
+	}
+	signature, err := asn1BitStringBytes(items[3])
+	if err != nil {
+		return nil, err
+	}
+	infoItems, ok := asn1Children(items[0].Bytes)
+	if !ok || len(infoItems) < 4 || len(infoItems) > 5 {
+		return nil, fmt.Errorf("invalid ses seal info")
+	}
+	info, certList, err := parseSESSealInfo(infoItems)
+	if err != nil {
+		return nil, err
+	}
+	picType, picData, err := parseSESPicture(infoItems[3])
+	if err != nil {
+		return nil, err
+	}
+	return &sesSeal{
+		Raw:       append([]byte(nil), raw.FullBytes...),
+		SignData:  append([]byte(nil), items[0].FullBytes...),
+		Cert:      cert,
+		SignAlg:   alg,
+		Signature: signature,
+		PicType:   picType,
+		PicData:   picData,
+		CertList:  certList,
+		Info:      info,
+	}, nil
+}
+
+// parseSESSealV1 解析SES V1电子印章
+// 入参: raw ASN.1原始值, items ASN.1子元素
+// 返回: *sesSeal SES电子印章, error 错误信息
+func parseSESSealV1(raw asn1.RawValue, items []asn1.RawValue) (*sesSeal, error) {
+	infoItems, ok := asn1Children(items[0].Bytes)
+	if !ok || len(infoItems) < 4 || len(infoItems) > 5 {
+		return nil, fmt.Errorf("invalid ses v1 seal info")
+	}
+	signItems, ok := asn1Children(items[1].Bytes)
+	if !ok || len(signItems) != 3 {
+		return nil, fmt.Errorf("invalid ses v1 sign info")
+	}
+	cert, err := asn1OctetString(signItems[0])
+	if err != nil {
+		return nil, err
+	}
+	alg, err := asn1OIDString(signItems[1])
+	if err != nil {
+		return nil, err
+	}
+	signature, err := asn1BitStringBytes(signItems[2])
+	if err != nil {
+		return nil, err
+	}
+	info, certList, err := parseSESSealInfo(infoItems)
+	if err != nil {
+		return nil, err
+	}
+	picType, picData, err := parseSESPicture(infoItems[3])
+	if err != nil {
+		return nil, err
+	}
+	signData := asn1SequenceBytes(items[0].FullBytes, signItems[0].FullBytes, signItems[1].FullBytes)
+	return &sesSeal{
+		Raw:       append([]byte(nil), raw.FullBytes...),
+		SignData:  signData,
+		Cert:      cert,
+		SignAlg:   alg,
+		Signature: signature,
+		PicType:   picType,
+		PicData:   picData,
+		CertList:  certList,
+		Info:      info,
+	}, nil
+}
+
+// parseSESSealInfo 解析电子印章信息
+// 入参: items 印章信息ASN.1子元素
+// 返回: SignatureSealInfo 印章信息, sesCertList 证书列表, error 错误信息
+func parseSESSealInfo(items []asn1.RawValue) (SignatureSealInfo, sesCertList, error) {
+	if len(items) < 4 {
+		return SignatureSealInfo{}, sesCertList{}, fmt.Errorf("invalid ses seal info")
+	}
+	header, ok := asn1Children(items[0].Bytes)
+	if !ok || len(header) != 3 {
+		return SignatureSealInfo{}, sesCertList{}, fmt.Errorf("invalid ses header")
+	}
+	if asn1String(header[0]) != "ES" {
+		return SignatureSealInfo{}, sesCertList{}, fmt.Errorf("invalid ses header")
+	}
+	version, err := asn1Integer(header[1])
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	property, ok := asn1Children(items[2].Bytes)
+	if !ok {
+		return SignatureSealInfo{}, sesCertList{}, fmt.Errorf("invalid ses property")
+	}
+	certIndex := 2
+	timeIndex := 3
+	if version >= 4 {
+		certIndex = 3
+		timeIndex = 4
+	}
+	if len(property) != timeIndex+3 {
+		return SignatureSealInfo{}, sesCertList{}, fmt.Errorf("invalid ses property")
+	}
+	typeValue, err := asn1Integer(property[0])
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	certList, err := parseSESCertList(property, version, certIndex)
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	createTime, err := asn1Time(property[timeIndex])
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	validStart, err := asn1Time(property[timeIndex+1])
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	validEnd, err := asn1Time(property[timeIndex+2])
+	if err != nil {
+		return SignatureSealInfo{}, sesCertList{}, err
+	}
+	return SignatureSealInfo{
+		Version:    version,
+		ID:         strings.TrimSpace(asn1String(items[1])),
+		VendorID:   strings.TrimSpace(asn1String(header[2])),
+		Type:       typeValue,
+		Name:       strings.TrimSpace(asn1String(property[1])),
+		CreateTime: createTime,
+		ValidStart: validStart,
+		ValidEnd:   validEnd,
+	}, certList, nil
+}
+
+// parseSESCertList 解析印章证书列表
+// 入参: property 印章属性, version 印章版本, certIndex 证书列表位置
+// 返回: sesCertList 证书列表, error 错误信息
+func parseSESCertList(property []asn1.RawValue, version, certIndex int) (sesCertList, error) {
+	if version == 1 {
+		return parseSESCertListV1(property[certIndex])
+	}
+	if version < 4 {
+		return parseSESCertInfoList(property[certIndex])
+	}
+	listType, err := asn1Integer(property[certIndex-1])
+	if err != nil {
+		return sesCertList{}, err
+	}
+	switch listType {
+	case 1:
+		return parseSESCertInfoList(property[certIndex])
+	case 2:
+		return parseSESCertDigestList(property[certIndex])
+	default:
+		return sesCertList{}, fmt.Errorf("unsupported ses cert list type")
+	}
+}
+
+// parseSESCertListV1 解析SES V1证书列表
+// 入参: raw 证书列表ASN.1值
+// 返回: sesCertList 证书列表, error 错误信息
+func parseSESCertListV1(raw asn1.RawValue) (sesCertList, error) {
+	certs, ok := asn1Children(raw.Bytes)
+	if !ok || len(certs) == 0 {
+		return sesCertList{}, fmt.Errorf("invalid ses cert list")
+	}
+	list := sesCertList{Certs: make([][]byte, 0, len(certs))}
+	for _, item := range certs {
+		list.Certs = append(list.Certs, append([]byte(nil), item.FullBytes...))
+	}
+	return list, nil
+}
+
+// parseSESCertInfoList 解析SES证书信息列表
+// 入参: raw 证书信息列表ASN.1值
+// 返回: sesCertList 证书列表, error 错误信息
+func parseSESCertInfoList(raw asn1.RawValue) (sesCertList, error) {
+	certs, ok := asn1Children(raw.Bytes)
+	if !ok || len(certs) == 0 {
+		return sesCertList{}, fmt.Errorf("invalid ses cert list")
+	}
+	list := sesCertList{Certs: make([][]byte, 0, len(certs))}
+	for _, item := range certs {
+		cert, err := asn1OctetString(item)
+		if err != nil {
+			return sesCertList{}, err
+		}
+		list.Certs = append(list.Certs, cert)
+	}
+	return list, nil
+}
+
+// parseSESCertDigestList 解析SES证书摘要列表
+// 入参: raw 证书摘要列表ASN.1值
+// 返回: sesCertList 证书列表, error 错误信息
+func parseSESCertDigestList(raw asn1.RawValue) (sesCertList, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) == 0 {
+		return sesCertList{}, fmt.Errorf("invalid ses cert digest list")
+	}
+	list := sesCertList{Digests: make([]sesCertDigest, 0, len(items))}
+	for _, item := range items {
+		fields, ok := asn1Children(item.Bytes)
+		if !ok || len(fields) != 2 {
+			return sesCertList{}, fmt.Errorf("invalid ses cert digest")
+		}
+		method := strings.TrimSpace(asn1String(fields[0]))
+		if method == "" {
+			return sesCertList{}, fmt.Errorf("invalid ses cert digest")
+		}
+		digest, err := asn1OctetString(fields[1])
+		if err != nil {
+			return sesCertList{}, err
+		}
+		list.Digests = append(list.Digests, sesCertDigest{Method: method, Value: digest})
+	}
+	return list, nil
+}
+
+// parseSESPicture 解析印章图片
+// 入参: raw 印章图片信息
+// 返回: string 图片类型, []byte 图片数据, error 错误信息
+func parseSESPicture(raw asn1.RawValue) (string, []byte, error) {
+	items, ok := asn1Children(raw.Bytes)
+	if !ok || len(items) < 4 {
+		return "", nil, fmt.Errorf("invalid ses picture")
+	}
+	picType := normalizeSealType(strings.ToLower(strings.TrimSpace(asn1String(items[0]))))
+	picData, err := asn1OctetString(items[1])
+	if err != nil {
+		return "", nil, err
+	}
+	if picType == "ofd" {
+		if data := trimOFDPackage(picData); len(data) > 0 {
+			picData = data
+		}
+	}
+	return picType, picData, nil
+}
+
+// parseSM2PublicKeyFromCert 从证书解析SM2公钥
+// 入参: data DER编码证书
+// 返回: sm2PublicKey SM2公钥, error 错误信息
+func parseSM2PublicKeyFromCert(data []byte) (sm2PublicKey, error) {
+	cert, err := parseSignatureCertificate(data)
+	if err != nil {
+		return sm2PublicKey{}, err
+	}
+	return parseSM2PublicKeyInfo(cert.PublicKey)
+}
+
+// parseSM2PublicKeyInfo 解析SM2公钥信息
+// 入参: raw SubjectPublicKeyInfo原始值
+// 返回: sm2PublicKey SM2公钥, error 错误信息
+func parseSM2PublicKeyInfo(raw asn1.RawValue) (sm2PublicKey, error) {
+	var spki struct {
+		Algorithm        asn1.RawValue
+		SubjectPublicKey asn1.BitString
+	}
+	rest, err := asn1.Unmarshal(raw.FullBytes, &spki)
+	if err != nil {
+		return sm2PublicKey{}, err
+	}
+	if len(rest) != 0 {
+		return sm2PublicKey{}, fmt.Errorf("invalid subject public key info")
+	}
+	algItems, ok := asn1Children(spki.Algorithm.Bytes)
+	if !ok || len(algItems) < 2 {
+		return sm2PublicKey{}, fmt.Errorf("invalid public key algorithm")
+	}
+	alg, err := asn1OIDString(algItems[0])
+	if err != nil {
+		return sm2PublicKey{}, err
+	}
+	curve, err := asn1OIDString(algItems[1])
+	if err != nil {
+		return sm2PublicKey{}, err
+	}
+	if alg != signECPublicKey || curve != signCurveSM2P256 {
+		return sm2PublicKey{}, fmt.Errorf("unsupported public key algorithm")
+	}
+	key := spki.SubjectPublicKey.Bytes
+	if len(key) != signPublicKeySize || key[0] != 4 {
+		return sm2PublicKey{}, fmt.Errorf("invalid sm2 public key")
+	}
+	return sm2PublicKey{
+		X: new(big.Int).SetBytes(key[1:33]),
+		Y: new(big.Int).SetBytes(key[33:65]),
+	}, nil
+}
+
+// signSM3 计算SM3摘要
+// 入参: data 原文数据
+// 返回: []byte 摘要值
+func signSM3(data []byte) []byte {
+	h := newSM3()
+	h.Write(data)
+	return h.Sum(nil)
+}
+
+// isSM2SignatureMethod 判断是否为SM2签名算法
+// 入参: method 算法标识
+// 返回: bool 是否为SM2签名算法
+func isSM2SignatureMethod(method string) bool {
+	switch signatureMethodText(method) {
+	case signMethodSM2SM3, signMethodSM2SM3B, signMethodSM2Sign, "SM2", "SM2SM3", "SM3SM2", "SM2WITHSM3", "SM3WITHSM2":
+		return true
+	default:
+		return false
+	}
+}
+
+// isSM3DigestMethod 判断是否为SM3摘要算法
+// 入参: method 算法标识
+// 返回: bool 是否为SM3摘要算法
+func isSM3DigestMethod(method string) bool {
+	switch signatureMethodText(method) {
+	case signDigestSM3, signDigestSM3NoKey, signDigestSM3Key, "SM3":
+		return true
+	default:
+		return false
+	}
+}
+
+// sesCertInList 判断证书是否在印章证书列表中
+// 入参: cert DER编码证书, list 证书列表
+// 返回: bool 是否存在
+func sesCertInList(cert []byte, list sesCertList) bool {
+	for _, item := range list.Certs {
+		if bytes.Equal(cert, item) {
+			return true
+		}
+	}
+	for _, item := range list.Digests {
+		digest, err := signatureDigest(item.Method, cert)
+		if err != nil {
+			continue
+		}
+		if bytes.Equal(digest, item.Value) {
+			return true
+		}
+	}
+	return false
+}
+
+// asn1OctetString 解析ASN.1八位字符串
+// 入参: raw ASN.1原始值
+// 返回: []byte 字节数据, error 错误信息
+func asn1OctetString(raw asn1.RawValue) ([]byte, error) {
+	var out []byte
+	rest, err := asn1.Unmarshal(raw.FullBytes, &out)
+	if err != nil || len(rest) != 0 {
+		return nil, fmt.Errorf("invalid octet string")
+	}
+	return append([]byte(nil), out...), nil
+}
+
+// asn1BitStringBytes 解析ASN.1位字符串
+// 入参: raw ASN.1原始值
+// 返回: []byte 字节数据, error 错误信息
+func asn1BitStringBytes(raw asn1.RawValue) ([]byte, error) {
+	var bits asn1.BitString
+	rest, err := asn1.Unmarshal(raw.FullBytes, &bits)
+	if err != nil || len(rest) != 0 || bits.BitLength%8 != 0 {
+		return nil, fmt.Errorf("invalid bit string")
+	}
+	return append([]byte(nil), bits.Bytes...), nil
+}
+
+// asn1BitOrOctetBytes 解析ASN.1位字符串或八位字符串
+// 入参: raw ASN.1原始值
+// 返回: []byte 字节数据, error 错误信息
+func asn1BitOrOctetBytes(raw asn1.RawValue) ([]byte, error) {
+	if raw.Tag == asn1.TagOctetString {
+		return asn1OctetString(raw)
+	}
+	return asn1BitStringBytes(raw)
+}
+
+// asn1OIDString 解析ASN.1对象标识符
+// 入参: raw ASN.1原始值
+// 返回: string OID字符串, error 错误信息
+func asn1OIDString(raw asn1.RawValue) (string, error) {
+	var oid asn1.ObjectIdentifier
+	rest, err := asn1.Unmarshal(raw.FullBytes, &oid)
+	if err != nil || len(rest) != 0 {
+		return "", fmt.Errorf("invalid oid")
+	}
+	return oid.String(), nil
+}
+
+// asn1Integer 解析ASN.1整数
+// 入参: raw ASN.1原始值
+// 返回: int 整数值, error 错误信息
+func asn1Integer(raw asn1.RawValue) (int, error) {
+	var out int
+	rest, err := asn1.Unmarshal(raw.FullBytes, &out)
+	if err != nil || len(rest) != 0 {
+		return 0, fmt.Errorf("invalid integer")
+	}
+	return out, nil
+}
+
+// asn1String 解析ASN.1字符串
+// 入参: raw ASN.1原始值
+// 返回: string 字符串
+func asn1String(raw asn1.RawValue) string {
+	var s string
+	if _, err := asn1.Unmarshal(raw.FullBytes, &s); err != nil {
+		return strings.TrimSpace(string(raw.Bytes))
+	}
+	return s
+}
+
+// asn1SequenceBytes 编码ASN.1序列
+// 入参: parts 序列元素DER数据
+// 返回: []byte ASN.1序列DER数据
+func asn1SequenceBytes(parts ...[]byte) []byte {
+	var content []byte
+	for _, part := range parts {
+		content = append(content, part...)
+	}
+	return asn1Wrap(0x30, content)
+}
+
+// asn1SetBytes 编码ASN.1集合
+// 入参: content 集合内容DER数据
+// 返回: []byte ASN.1集合DER数据
+func asn1SetBytes(content []byte) []byte {
+	return asn1Wrap(0x31, content)
+}
+
+// asn1Wrap 包装ASN.1标签
+// 入参: tag ASN.1标签, content 内容DER数据
+// 返回: []byte ASN.1 DER数据
+func asn1Wrap(tag byte, content []byte) []byte {
+	out := []byte{tag}
+	out = append(out, asn1LengthBytes(len(content))...)
+	out = append(out, content...)
+	return out
+}
+
+// asn1LengthBytes 编码ASN.1长度
+// 入参: n 内容长度
+// 返回: []byte ASN.1长度编码
+func asn1LengthBytes(n int) []byte {
+	if n < 128 {
+		return []byte{byte(n)}
+	}
+	var buf [8]byte
+	i := len(buf)
+	for n > 0 {
+		i--
+		buf[i] = byte(n)
+		n >>= 8
+	}
+	out := []byte{0x80 | byte(len(buf)-i)}
+	return append(out, buf[i:]...)
+}
@@ -0,0 +1,326 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"encoding/asn1"
+	"encoding/binary"
+	"math/big"
+)
+
+const sm2DefaultUserID = "1234567812345678"
+
+var sm2P256 = newSM2P256()
+
+// sm2PublicKey SM2公钥
+type sm2PublicKey struct {
+	X *big.Int
+	Y *big.Int
+}
+
+// sm2Curve SM2椭圆曲线
+type sm2Curve struct {
+	P  *big.Int
+	N  *big.Int
+	B  *big.Int
+	Gx *big.Int
+	Gy *big.Int
+}
+
+// sm2Point SM2雅可比坐标点
+type sm2Point struct {
+	X *big.Int
+	Y *big.Int
+	Z *big.Int
+}
+
+// newSM2P256 创建SM2椭圆曲线
+// 返回: *sm2Curve SM2椭圆曲线
+func newSM2P256() *sm2Curve {
+	return &sm2Curve{
+		P:  sm2Big("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF"),
+		N:  sm2Big("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123"),
+		B:  sm2Big("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93"),
+		Gx: sm2Big("32C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7"),
+		Gy: sm2Big("BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"),
+	}
+}
+
+// sm2Big 解析SM2大整数常量
+// 入参: s 十六进制字符串
+// 返回: *big.Int 大整数
+func sm2Big(s string) *big.Int {
+	n, _ := new(big.Int).SetString(s, 16)
+	return n
+}
+
+// sm2VerifySignature 验证SM2签名值
+// 入参: pub 公钥, userID 用户标识, msg 原文, sig 签名值
+// 返回: bool 是否验证通过
+func sm2VerifySignature(pub sm2PublicKey, userID, msg, sig []byte) bool {
+	r, s, ok := parseSM2Signature(sig)
+	if !ok {
+		return false
+	}
+	return sm2Verify(pub, userID, msg, r, s)
+}
+
+// parseSM2Signature 解析SM2签名值
+// 入参: sig 签名值
+// 返回: *big.Int R值, *big.Int S值, bool 是否解析成功
+func parseSM2Signature(sig []byte) (*big.Int, *big.Int, bool) {
+	if len(sig) == 64 {
+		return new(big.Int).SetBytes(sig[:32]), new(big.Int).SetBytes(sig[32:]), true
+	}
+	var rs struct {
+		R *big.Int
+		S *big.Int
+	}
+	rest, err := asn1.Unmarshal(sig, &rs)
+	if err != nil || len(rest) != 0 || rs.R == nil || rs.S == nil {
+		return nil, nil, false
+	}
+	return rs.R, rs.S, true
+}
+
+// sm2Verify 验证SM2签名
+// 入参: pub 公钥, userID 用户标识, msg 原文, r R值, s S值
+// 返回: bool 是否验证通过
+func sm2Verify(pub sm2PublicKey, userID, msg []byte, r, s *big.Int) bool {
+	n := sm2P256.N
+	if r.Sign() <= 0 || s.Sign() <= 0 || r.Cmp(n) >= 0 || s.Cmp(n) >= 0 {
+		return false
+	}
+	if pub.X == nil || pub.Y == nil || !sm2P256.isOnCurve(pub.X, pub.Y) {
+		return false
+	}
+	e := new(big.Int).SetBytes(sm2MessageDigest(pub, userID, msg))
+	t := new(big.Int).Add(r, s)
+	t.Mod(t, n)
+	if t.Sign() == 0 {
+		return false
+	}
+	x, ok := sm2P256.combinedMult(pub.X, pub.Y, s, t)
+	if !ok {
+		return false
+	}
+	v := new(big.Int).Add(e, x)
+	v.Mod(v, n)
+	return v.Cmp(r) == 0
+}
+
+// sm2MessageDigest 计算SM2签名摘要
+// 入参: pub 公钥, userID 用户标识, msg 原文
+// 返回: []byte 摘要值
+func sm2MessageDigest(pub sm2PublicKey, userID, msg []byte) []byte {
+	h := newSM3()
+	h.Write(sm2ZA(pub, userID))
+	h.Write(msg)
+	return h.Sum(nil)
+}
+
+// sm2ZA 计算SM2用户标识杂凑值
+// 入参: pub 公钥, userID 用户标识
+// 返回: []byte ZA值
+func sm2ZA(pub sm2PublicKey, userID []byte) []byte {
+	if len(userID) == 0 {
+		userID = []byte(sm2DefaultUserID)
+	}
+	h := newSM3()
+	var entl [2]byte
+	binary.BigEndian.PutUint16(entl[:], uint16(len(userID)*8))
+	h.Write(entl[:])
+	h.Write(userID)
+	h.Write(sm2Fixed(sm2A()))
+	h.Write(sm2Fixed(sm2P256.B))
+	h.Write(sm2Fixed(sm2P256.Gx))
+	h.Write(sm2Fixed(sm2P256.Gy))
+	h.Write(sm2Fixed(pub.X))
+	h.Write(sm2Fixed(pub.Y))
+	return h.Sum(nil)
+}
+
+// sm2A 获取SM2曲线A参数
+// 返回: *big.Int 曲线A参数
+func sm2A() *big.Int {
+	return new(big.Int).Sub(sm2P256.P, big.NewInt(3))
+}
+
+// isOnCurve 判断点是否位于SM2曲线
+// 入参: x X坐标, y Y坐标
+// 返回: bool 是否位于曲线
+func (c *sm2Curve) isOnCurve(x, y *big.Int) bool {
+	if x.Sign() < 0 || y.Sign() < 0 || x.Cmp(c.P) >= 0 || y.Cmp(c.P) >= 0 {
+		return false
+	}
+	left := c.fieldSquare(y)
+	right := c.fieldAdd(c.fieldSub(c.fieldMul(c.fieldSquare(x), x), c.fieldScale(x, 3)), c.B)
+	return left.Cmp(right) == 0
+}
+
+// combinedMult 计算sG+tP
+// 入参: x 公钥X坐标, y 公钥Y坐标, s 标量S, t 标量T
+// 返回: *big.Int 结果X坐标, bool 是否计算成功
+func (c *sm2Curve) combinedMult(x, y, s, t *big.Int) (*big.Int, bool) {
+	base := c.scalarMult(c.Gx, c.Gy, s.Bytes())
+	public := c.scalarMult(x, y, t.Bytes())
+	result := c.add(base, public)
+	affineX, _, ok := c.affine(result)
+	return affineX, ok
+}
+
+// scalarMult 计算椭圆曲线标量乘法
+// 入参: x 点X坐标, y 点Y坐标, scalar 标量
+// 返回: sm2Point 雅可比坐标点
+func (c *sm2Curve) scalarMult(x, y *big.Int, scalar []byte) sm2Point {
+	result := c.infinity()
+	point := sm2Point{X: new(big.Int).Set(x), Y: new(big.Int).Set(y), Z: big.NewInt(1)}
+	for _, value := range scalar {
+		for bit := 7; bit >= 0; bit-- {
+			result = c.double(result)
+			if value&(1<<uint(bit)) != 0 {
+				result = c.add(result, point)
+			}
+		}
+	}
+	return result
+}
+
+// add 计算椭圆曲线点加法
+// 入参: p 点P, q 点Q
+// 返回: sm2Point 结果点
+func (c *sm2Curve) add(p, q sm2Point) sm2Point {
+	if p.Z.Sign() == 0 {
+		return q
+	}
+	if q.Z.Sign() == 0 {
+		return p
+	}
+	z1z1 := c.fieldSquare(p.Z)
+	z2z2 := c.fieldSquare(q.Z)
+	u1 := c.fieldMul(p.X, z2z2)
+	u2 := c.fieldMul(q.X, z1z1)
+	s1 := c.fieldMul(p.Y, c.fieldMul(q.Z, z2z2))
+	s2 := c.fieldMul(q.Y, c.fieldMul(p.Z, z1z1))
+	if u1.Cmp(u2) == 0 {
+		if s1.Cmp(s2) != 0 {
+			return c.infinity()
+		}
+		return c.double(p)
+	}
+	h := c.fieldSub(u2, u1)
+	i := c.fieldSquare(c.fieldScale(h, 2))
+	j := c.fieldMul(h, i)
+	r := c.fieldScale(c.fieldSub(s2, s1), 2)
+	v := c.fieldMul(u1, i)
+	x := c.fieldSub(c.fieldSub(c.fieldSquare(r), j), c.fieldScale(v, 2))
+	y := c.fieldSub(c.fieldMul(r, c.fieldSub(v, x)), c.fieldScale(c.fieldMul(s1, j), 2))
+	z := c.fieldMul(c.fieldSub(c.fieldSub(c.fieldSquare(c.fieldAdd(p.Z, q.Z)), z1z1), z2z2), h)
+	return sm2Point{X: x, Y: y, Z: z}
+}
+
+// double 计算椭圆曲线点倍加
+// 入参: p 点P
+// 返回: sm2Point 结果点
+func (c *sm2Curve) double(p sm2Point) sm2Point {
+	if p.Z.Sign() == 0 || p.Y.Sign() == 0 {
+		return c.infinity()
+	}
+	delta := c.fieldSquare(p.Z)
+	gamma := c.fieldSquare(p.Y)
+	beta := c.fieldMul(p.X, gamma)
+	alpha := c.fieldScale(c.fieldMul(c.fieldSub(p.X, delta), c.fieldAdd(p.X, delta)), 3)
+	x := c.fieldSub(c.fieldSquare(alpha), c.fieldScale(beta, 8))
+	z := c.fieldSub(c.fieldSub(c.fieldSquare(c.fieldAdd(p.Y, p.Z)), gamma), delta)
+	y := c.fieldSub(c.fieldMul(alpha, c.fieldSub(c.fieldScale(beta, 4), x)), c.fieldScale(c.fieldSquare(gamma), 8))
+	return sm2Point{X: x, Y: y, Z: z}
+}
+
+// affine 将雅可比坐标转换为仿射坐标
+// 入参: p 雅可比坐标点
+// 返回: *big.Int X坐标, *big.Int Y坐标, bool 是否转换成功
+func (c *sm2Curve) affine(p sm2Point) (*big.Int, *big.Int, bool) {
+	if p.Z.Sign() == 0 {
+		return nil, nil, false
+	}
+	z := new(big.Int).ModInverse(p.Z, c.P)
+	if z == nil {
+		return nil, nil, false
+	}
+	z2 := c.fieldSquare(z)
+	x := c.fieldMul(p.X, z2)
+	y := c.fieldMul(p.Y, c.fieldMul(z2, z))
+	return x, y, true
+}
+
+// infinity 获取无穷远点
+// 返回: sm2Point 无穷远点
+func (c *sm2Curve) infinity() sm2Point {
+	return sm2Point{X: new(big.Int), Y: new(big.Int), Z: new(big.Int)}
+}
+
+// fieldAdd 计算有限域加法
+// 入参: x 左操作数, y 右操作数
+// 返回: *big.Int 计算结果
+func (c *sm2Curve) fieldAdd(x, y *big.Int) *big.Int {
+	value := new(big.Int).Add(x, y)
+	return value.Mod(value, c.P)
+}
+
+// fieldSub 计算有限域减法
+// 入参: x 左操作数, y 右操作数
+// 返回: *big.Int 计算结果
+func (c *sm2Curve) fieldSub(x, y *big.Int) *big.Int {
+	value := new(big.Int).Sub(x, y)
+	return value.Mod(value, c.P)
+}
+
+// fieldMul 计算有限域乘法
+// 入参: x 左操作数, y 右操作数
+// 返回: *big.Int 计算结果
+func (c *sm2Curve) fieldMul(x, y *big.Int) *big.Int {
+	value := new(big.Int).Mul(x, y)
+	return value.Mod(value, c.P)
+}
+
+// fieldSquare 计算有限域平方
+// 入参: x 操作数
+// 返回: *big.Int 计算结果
+func (c *sm2Curve) fieldSquare(x *big.Int) *big.Int {
+	return c.fieldMul(x, x)
+}
+
+// fieldScale 计算有限域整数倍
+// 入参: x 操作数, scale 倍数
+// 返回: *big.Int 计算结果
+func (c *sm2Curve) fieldScale(x *big.Int, scale int64) *big.Int {
+	return c.fieldMul(x, big.NewInt(scale))
+}
+
+// sm2Fixed 转换为SM2固定长度字节
+// 入参: n 大整数
+// 返回: []byte 固定长度字节
+func sm2Fixed(n *big.Int) []byte {
+	out := make([]byte, 32)
+	if n == nil {
+		return out
+	}
+	b := n.Bytes()
+	if len(b) > len(out) {
+		b = b[len(b)-len(out):]
+	}
+	copy(out[len(out)-len(b):], b)
+	return out
+}
@@ -0,0 +1,211 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"encoding/binary"
+	"hash"
+	"math/bits"
+)
+
+const (
+	sm3Size      = 32
+	sm3BlockSize = 64
+)
+
+var sm3Init = [8]uint32{
+	0x7380166f,
+	0x4914b2b9,
+	0x172442d7,
+	0xda8a0600,
+	0xa96f30bc,
+	0x163138aa,
+	0xe38dee4d,
+	0xb0fb0e4e,
+}
+
+// sm3Digest SM3杂凑值计算器
+type sm3Digest struct {
+	h   [8]uint32
+	x   [sm3BlockSize]byte
+	nx  int
+	len uint64
+}
+
+// newSM3 创建SM3杂凑值计算器
+// 返回: hash.Hash SM3杂凑值计算器
+func newSM3() hash.Hash {
+	d := new(sm3Digest)
+	d.Reset()
+	return d
+}
+
+// Reset 重置SM3状态
+func (d *sm3Digest) Reset() {
+	d.h = sm3Init
+	d.nx = 0
+	d.len = 0
+}
+
+// Size 获取SM3杂凑值长度
+// 返回: int 杂凑值长度
+func (d *sm3Digest) Size() int {
+	return sm3Size
+}
+
+// BlockSize 获取SM3分组长度
+// 返回: int 分组长度
+func (d *sm3Digest) BlockSize() int {
+	return sm3BlockSize
+}
+
+// Write 写入待计算数据
+// 入参: p 待计算数据
+// 返回: int 写入长度, error 错误信息
+func (d *sm3Digest) Write(p []byte) (int, error) {
+	nn := len(p)
+	d.len += uint64(nn)
+	if d.nx > 0 {
+		n := copy(d.x[d.nx:], p)
+		d.nx += n
+		if d.nx == sm3BlockSize {
+			sm3Block(d, d.x[:])
+			d.nx = 0
+		}
+		p = p[n:]
+	}
+	if len(p) >= sm3BlockSize {
+		n := len(p) &^ (sm3BlockSize - 1)
+		sm3Block(d, p[:n])
+		p = p[n:]
+	}
+	if len(p) > 0 {
+		d.nx = copy(d.x[:], p)
+	}
+	return nn, nil
+}
+
+// Sum 返回SM3杂凑值
+// 入参: in 前缀数据
+// 返回: []byte 杂凑值
+func (d *sm3Digest) Sum(in []byte) []byte {
+	dd := *d
+	hash := dd.checkSum()
+	return append(in, hash[:]...)
+}
+
+// checkSum 计算SM3最终杂凑值
+// 返回: [sm3Size]byte 杂凑值
+func (d *sm3Digest) checkSum() [sm3Size]byte {
+	lenBits := d.len << 3
+	var tmp [64]byte
+	tmp[0] = 0x80
+	if d.nx < 56 {
+		d.Write(tmp[:56-d.nx])
+	} else {
+		d.Write(tmp[:64+56-d.nx])
+	}
+	binary.BigEndian.PutUint64(tmp[:8], lenBits)
+	d.Write(tmp[:8])
+	var digest [sm3Size]byte
+	for i, v := range d.h {
+		binary.BigEndian.PutUint32(digest[i*4:], v)
+	}
+	return digest
+}
+
+// sm3Block 处理SM3消息分组
+// 入参: d SM3杂凑值计算器, p 消息分组数据
+func sm3Block(d *sm3Digest, p []byte) {
+	var w [68]uint32
+	var w1 [64]uint32
+	for len(p) >= sm3BlockSize {
+		for i := 0; i < 16; i++ {
+			w[i] = binary.BigEndian.Uint32(p[i*4:])
+		}
+		for i := 16; i < 68; i++ {
+			x := w[i-16] ^ w[i-9] ^ bits.RotateLeft32(w[i-3], 15)
+			w[i] = sm3P1(x) ^ bits.RotateLeft32(w[i-13], 7) ^ w[i-6]
+		}
+		for i := 0; i < 64; i++ {
+			w1[i] = w[i] ^ w[i+4]
+		}
+		a, b, c, e := d.h[0], d.h[1], d.h[2], d.h[4]
+		dd, f, g, hh := d.h[3], d.h[5], d.h[6], d.h[7]
+		for i := 0; i < 64; i++ {
+			t := uint32(0x7a879d8a)
+			if i < 16 {
+				t = 0x79cc4519
+			}
+			ss1 := bits.RotateLeft32(bits.RotateLeft32(a, 12)+e+bits.RotateLeft32(t, i), 7)
+			ss2 := ss1 ^ bits.RotateLeft32(a, 12)
+			tt1 := sm3FF(i, a, b, c) + dd + ss2 + w1[i]
+			tt2 := sm3GG(i, e, f, g) + hh + ss1 + w[i]
+			dd = c
+			c = bits.RotateLeft32(b, 9)
+			b = a
+			a = tt1
+			hh = g
+			g = bits.RotateLeft32(f, 19)
+			f = e
+			e = sm3P0(tt2)
+		}
+		d.h[0] ^= a
+		d.h[1] ^= b
+		d.h[2] ^= c
+		d.h[3] ^= dd
+		d.h[4] ^= e
+		d.h[5] ^= f
+		d.h[6] ^= g
+		d.h[7] ^= hh
+		p = p[sm3BlockSize:]
+	}
+}
+
+// sm3P0 计算SM3置换函数P0
+// 入参: x 输入值
+// 返回: uint32 置换结果
+func sm3P0(x uint32) uint32 {
+	return x ^ bits.RotateLeft32(x, 9) ^ bits.RotateLeft32(x, 17)
+}
+
+// sm3P1 计算SM3置换函数P1
+// 入参: x 输入值
+// 返回: uint32 置换结果
+func sm3P1(x uint32) uint32 {
+	return x ^ bits.RotateLeft32(x, 15) ^ bits.RotateLeft32(x, 23)
+}
+
+// sm3FF 计算SM3布尔函数FF
+// 入参: i 轮数, x 输入值, y 输入值, z 输入值
+// 返回: uint32 计算结果
+func sm3FF(i int, x, y, z uint32) uint32 {
+	if i < 16 {
+		return x ^ y ^ z
+	}
+	return (x & y) | (x & z) | (y & z)
+}
+
+// sm3GG 计算SM3布尔函数GG
+// 入参: i 轮数, x 输入值, y 输入值, z 输入值
+// 返回: uint32 计算结果
+func sm3GG(i int, x, y, z uint32) uint32 {
+	if i < 16 {
+		return x ^ y ^ z
+	}
+	return (x & y) | (^x & z)
+}
+
+var _ hash.Hash = (*sm3Digest)(nil)
@@ -15,333 +15,322 @@
 package ofdgo

 import (
-	"image/color"
+	"math"
 	"strconv"
 	"strings"

 	"github.com/tdewolff/canvas"
+	canvastext "github.com/tdewolff/canvas/text"
+	"github.com/tdewolff/font"
 )

-// parseColor 解析颜色字符串
-// 入参: val 颜色值(R G B)
-// 返回: color.Color 颜色对象
-func parseColor(val string) color.Color {
-	return parseColorWithAlpha(val, nil)
+// textGlyph 绘制字形
+type textGlyph struct {
+	Text    string
+	GlyphID int
 }

-// parseColorWithAlpha 解析带透明度的颜色
-// 入参: val 颜色值, alpha 透明度
-// 返回: color.Color 颜色对象
-func parseColorWithAlpha(val string, alpha *int) color.Color {
-	parts := strings.Fields(val)
-	if len(parts) >= 3 {
-		r := parseColorComponent(parts[0])
-		g := parseColorComponent(parts[1])
-		b := parseColorComponent(parts[2])
-		a := 255
-		if alpha != nil {
-			a = *alpha
-		}
-		a = clampColor(a)
-		return color.RGBA{
-			R: uint8(clampColor(r) * a / 255),
-			G: uint8(clampColor(g) * a / 255),
-			B: uint8(clampColor(b) * a / 255),
-			A: uint8(a),
-		}
-	}
-	return color.Black
+// textGlyphPathCacheKey 字形路径缓存键
+type textGlyphPathCacheKey struct {
+	font       *canvas.Font
+	size       float64
+	fauxBold   float64
+	fauxItalic float64
+	xOffset    int32
+	yOffset    int32
+	language   string
+	script     canvastext.Script
+	direction  canvastext.Direction
+	glyph      textGlyph
 }

-// parseColorComponent 解析颜色分量
-// 入参: s 颜色分量
-// 返回: int 颜色分量值
-func parseColorComponent(s string) int {
-	s = strings.TrimSpace(s)
-	if strings.HasPrefix(s, "#") {
-		v, _ := strconv.ParseInt(strings.TrimPrefix(s, "#"), 16, 0)
-		return int(v)
-	}
-	v, _ := strconv.Atoi(s)
-	return v
+// textGlyphPathCacheValue 字形路径缓存值
+type textGlyphPathCacheValue struct {
+	path  *canvas.Path
+	width float64
 }

-// clampColor 限制颜色分量范围
-// 入参: v 颜色分量
-// 返回: int 颜色分量
-func clampColor(v int) int {
-	if v < 0 {
+// textGlyphTransform 字符到字形变换
+type textGlyphTransform struct {
+	CodeCount int
+	Glyphs    []textGlyph
+}
+
+// textObjectFontID 获取文本对象字体ID
+// 入参: text 文本对象
+// 返回: string 字体ID
+func (r *Renderer) textObjectFontID(text TextObject) string {
+	fontID := text.Font
+	if fontID == "" && text.DrawParam != "" {
+		if dp := r.getDrawParam(text.DrawParam, nil); dp != nil && dp.Font != "" {
+			fontID = dp.Font
+		}
+	}
+	return fontID
+}
+
+// textObjectGlyphTransforms 获取文本对象的字形变换
+// 入参: fontID 字体ID, text 文本对象
+// 返回: map[int]textGlyphTransform 文本位置到字形变换的映射
+func (r *Renderer) textObjectGlyphTransforms(fontID string, text TextObject) map[int]textGlyphTransform {
+	if fontID == "" || len(text.CGTransform) == 0 {
+		return nil
+	}
+	result := make(map[int]textGlyphTransform, len(text.CGTransform))
+	for _, transform := range text.CGTransform {
+		ids := parseInts(transform.Glyphs)
+		glyphCount := len(ids)
+		if transform.GlyphCount > 0 && transform.GlyphCount < glyphCount {
+			glyphCount = transform.GlyphCount
+		}
+		if glyphCount == 0 {
+			continue
+		}
+		codeCount := transform.CodeCount
+		if codeCount <= 0 {
+			codeCount = 1
+		}
+		glyphs := make([]textGlyph, glyphCount)
+		for i := range glyphs {
+			glyphs[i] = r.textGlyphFromID(fontID, ids[i])
+		}
+		result[transform.CodePosition] = textGlyphTransform{
+			CodeCount: codeCount,
+			Glyphs:    glyphs,
+		}
+	}
+	if len(result) == 0 {
+		return nil
+	}
+	return result
+}
+
+// textCodeGlyphs 获取文本编码对应的绘制字形
+// 入参: runes 文本字符, transforms 字形变换, codeOffset 文本编码偏移
+// 返回: []textGlyph 绘制字形列表
+func textCodeGlyphs(runes []rune, transforms map[int]textGlyphTransform, codeOffset int) []textGlyph {
+	if len(transforms) == 0 {
+		return textRuneGlyphs(runes)
+	}
+	glyphs := make([]textGlyph, 0, len(runes))
+	for i := 0; i < len(runes); {
+		if transform, ok := transforms[codeOffset+i]; ok && i+transform.CodeCount <= len(runes) {
+			glyphs = append(glyphs, transform.Glyphs...)
+			i += transform.CodeCount
+			continue
+		}
+		glyphs = append(glyphs, textGlyph{Text: string(runes[i]), GlyphID: -1})
+		i++
+	}
+	return glyphs
+}
+
+// textRuneGlyphs 转换文本字符为绘制字形
+// 入参: runes 文本字符
+// 返回: []textGlyph 绘制字形列表
+func textRuneGlyphs(runes []rune) []textGlyph {
+	glyphs := make([]textGlyph, len(runes))
+	for i, r := range runes {
+		glyphs[i] = textGlyph{Text: string(r), GlyphID: -1}
+	}
+	return glyphs
+}
+
+// textGlyphFromID 获取字形ID对应的绘制字形
+// 入参: fontID 字体ID, glyphID 字形ID或CID
+// 返回: textGlyph 绘制字形
+func (r *Renderer) textGlyphFromID(fontID string, glyphID int) textGlyph {
+	if mapped, ok := r.fontGlyphRune(fontID, glyphID); ok {
+		return textGlyph{Text: string(mapped), GlyphID: -1}
+	}
+	return textGlyph{GlyphID: glyphID}
+}
+
+// textGlyphWidth 获取绘制字形宽度
+// 入参: face 字体, glyph 绘制字形
+// 返回: float64 字形宽度
+func textGlyphWidth(face *canvas.FontFace, glyph textGlyph) float64 {
+	if glyph.GlyphID >= 0 && glyph.GlyphID <= 0xFFFF {
+		return face.MmPerEm * float64(face.Font.GlyphAdvance(uint16(glyph.GlyphID)))
+	}
+	return face.TextWidth(glyph.Text)
+}
+
+// textGlyphPath 获取绘制字形路径
+// 入参: face 字体, glyph 绘制字形
+// 返回: *canvas.Path 字形路径, float64 字形宽度
+func textGlyphPath(face *canvas.FontFace, glyph textGlyph) (*canvas.Path, float64) {
+	if glyph.GlyphID < 0 || glyph.GlyphID > 0xFFFF {
+		return face.ToPath(glyph.Text)
+	}
+	p := &canvas.Path{}
+	glyphID := uint16(glyph.GlyphID)
+	_ = face.Font.GlyphPath(p, glyphID, face.PPEM(canvas.DefaultResolution), 0, 0, face.MmPerEm, font.NoHinting)
+	if face.FauxBold != 0 {
+		d := face.FauxBold * face.Size
+		if face.Font.IsTrueType {
+			d = -d
+		}
+		origFastStroke := canvas.FastStroke
+		canvas.FastStroke = true
+		p = p.Offset(d, canvas.Tolerance)
+		canvas.FastStroke = origFastStroke
+	}
+	if face.FauxItalic != 0 {
+		p = p.Transform(canvas.Identity.Shear(face.FauxItalic, 0))
+	}
+	return p, face.MmPerEm * float64(face.Font.GlyphAdvance(glyphID))
+}
+
+// cachedTextGlyphPath 获取缓存的字形路径
+// 入参: face 字体, glyph 绘制字形
+// 返回: *canvas.Path 字形路径, float64 字形宽度
+func (r *Renderer) cachedTextGlyphPath(face *canvas.FontFace, glyph textGlyph) (*canvas.Path, float64) {
+	key := textGlyphPathCacheKey{
+		font:       face.Font,
+		size:       face.Size,
+		fauxBold:   face.FauxBold,
+		fauxItalic: face.FauxItalic,
+		xOffset:    face.XOffset,
+		yOffset:    face.YOffset,
+		language:   face.Language,
+		script:     face.Script,
+		direction:  face.Direction,
+		glyph:      glyph,
+	}
+	if cached, ok := r.textGlyphPathCache[key]; ok {
+		return cached.path, cached.width
+	}
+	path, width := textGlyphPath(face, glyph)
+	r.textGlyphPathCache[key] = textGlyphPathCacheValue{path: path, width: width}
+	return path, width
+}
+
+// hasTextMatrix 判断文本是否需要应用字形变换
+// 入参: ctm 变换矩阵
+// 返回: bool 是否需要变换
+func hasTextMatrix(ctm Matrix) bool {
+	const eps = 1e-9
+	return math.Abs(ctm.a-1) > eps || math.Abs(ctm.b) > eps || math.Abs(ctm.c) > eps || math.Abs(ctm.d-1) > eps
+}
+
+// textMatrix 获取文本字形变换矩阵
+// 入参: ctm OFD变换矩阵
+// 返回: canvas.Matrix 画布变换矩阵
+func textMatrix(ctm Matrix) canvas.Matrix {
+	return canvas.Matrix{
+		{ctm.a, -ctm.c, 0},
+		{-ctm.b, ctm.d, 0},
+	}
+}
+
+// fontGlyphRune 获取字形ID对应的包装字体字符
+// 入参: fontID 字体ID, glyphID 字形ID或CID
+// 返回: rune 包装字体字符, bool 是否存在
+func (r *Renderer) fontGlyphRune(fontID string, glyphID int) (rune, bool) {
+	if glyphID < 0 || glyphID > 0xFFFF {
+		return 0, false
+	}
+	id := uint16(glyphID)
+	if r.FontCIDMap != nil {
+		if mapping := r.FontCIDMap[fontID]; mapping != nil {
+			if mapped, ok := mapping[id]; ok {
+				return mapped, true
+			}
+		}
+	}
+	if r.FontGIDMap != nil {
+		if mapping := r.FontGIDMap[fontID]; mapping != nil {
+			if mapped, ok := mapping[id]; ok {
+				return mapped, true
+			}
+		}
+	}
+	return 0, false
+}
+
+// parseIndexRunes 解析索引字形
+// 入参: indexStr 索引字符串, fontID 字体ID
+// 返回: []rune 字形列表
+func (r *Renderer) parseIndexRunes(indexStr string, fontID string) []rune {
+	parts := strings.Fields(indexStr)
+	result := make([]rune, 0, len(parts))
+	for _, p := range parts {
+		if startText, endText, ok := strings.Cut(p, "-"); ok {
+			if !strings.Contains(endText, "-") {
+				start, _ := strconv.Atoi(startText)
+				end, _ := strconv.Atoi(endText)
+				for k := start; k <= end; k++ {
+					result = append(result, r.textIndexRune(fontID, k))
+				}
+			}
+		} else {
+			val, _ := strconv.Atoi(p)
+			result = append(result, r.textIndexRune(fontID, val))
+		}
+	}
+	return result
+}
+
+// textIndexRune 获取索引字形对应的字符
+// 入参: fontID 字体ID, glyphID 字形ID或CID
+// 返回: rune 字符
+func (r *Renderer) textIndexRune(fontID string, glyphID int) rune {
+	if mapped, ok := r.fontGlyphRune(fontID, glyphID); ok {
+		return mapped
+	}
+	return rune(glyphID)
+}
+
+// textGlyphAdvanceLimit 获取显式字形推进宽度
+// 入参: dxs X方向偏移, dys Y方向偏移, xs X坐标列表, index 字形索引, count 字形数量, currentX 当前X坐标
+// 返回: float64 推进宽度
+func textGlyphAdvanceLimit(dxs, dys, xs []float64, index int, count int, currentX float64) float64 {
+	if index+1 >= count || len(dys) > 0 {
 		return 0
 	}
-	if v > 255 {
-		return 255
+	if index+1 < len(xs) {
+		if advance := xs[index+1] - currentX; advance > 0 {
+			return advance
 		}
-	return v
+	}
+	if advance, ok := textDelta(dxs, index); ok && advance > 0 {
+		return advance
+	}
+	return 0
 }

-// mergeAlpha 合并透明度
-// 入参: colorAlpha 颜色透明度, objectAlpha 对象透明度
-// 返回: *int 合并后的透明度
-func mergeAlpha(colorAlpha, objectAlpha *int) *int {
-	if colorAlpha == nil && objectAlpha == nil {
-		return nil
-	}
-	alpha := 255
-	if colorAlpha != nil {
-		alpha = *colorAlpha
-	}
-	if objectAlpha != nil {
-		alpha = alpha * *objectAlpha / 255
-	}
-	alpha = clampColor(alpha)
-	return &alpha
+// textCodePositioned 判断文本编码是否带显式定位
+// 入参: textCode 文本编码, xs X坐标列表, ys Y坐标列表
+// 返回: bool 是否带显式定位
+func textCodePositioned(textCode TextCode, xs, ys []float64) bool {
+	return strings.TrimSpace(textCode.DeltaX) != "" ||
+		strings.TrimSpace(textCode.DeltaY) != "" ||
+		len(xs) > 1 ||
+		len(ys) > 1
 }

-// withFillAlpha 合并填充色透明度
-// 入参: fillColor 填充颜色节点, alpha 对象透明度
-// 返回: *FillColor 合并后的填充颜色节点
-func withFillAlpha(fillColor *FillColor, alpha *int) *FillColor {
-	if fillColor == nil || alpha == nil {
-		return fillColor
+// textDelta 获取文本偏移量
+// 入参: deltas 偏移量数组, index 偏移量索引
+// 返回: float64 偏移量, bool 是否存在
+func textDelta(deltas []float64, index int) (float64, bool) {
+	if len(deltas) == 0 {
+		return 0, false
 	}
-	merged := *fillColor
-	merged.Alpha = mergeAlpha(fillColor.Alpha, alpha)
-	return &merged
+	if index < len(deltas) {
+		return deltas[index], true
+	}
+	return deltas[len(deltas)-1], true
 }

-// withStrokeAlpha 合并勾边色透明度
-// 入参: strokeColor 勾边颜色节点, alpha 对象透明度
-// 返回: *StrokeColor 合并后的勾边颜色节点
-func withStrokeAlpha(strokeColor *StrokeColor, alpha *int) *StrokeColor {
-	if strokeColor == nil || alpha == nil {
-		return strokeColor
+// textCodeRunes 获取文本编码字符
+// 入参: value 文本编码内容
+// 返回: []rune 文本字符
+func textCodeRunes(value string) []rune {
+	if strings.ContainsAny(value, "\r\n") {
+		value = strings.TrimSpace(value)
 	}
-	merged := *strokeColor
-	merged.Alpha = mergeAlpha(strokeColor.Alpha, alpha)
-	return &merged
-}
-
-// colorWithAlpha 合并颜色透明度
-// 入参: c 颜色对象, alpha 对象透明度
-// 返回: color.Color 合并后的颜色对象
-func colorWithAlpha(c color.Color, alpha *int) color.Color {
-	if c == nil || alpha == nil {
-		return c
-	}
-	a := clampColor(*alpha)
-	rgba := colorToRGBA(c)
-	return color.RGBA{
-		R: uint8(int(rgba.R) * a / 255),
-		G: uint8(int(rgba.G) * a / 255),
-		B: uint8(int(rgba.B) * a / 255),
-		A: uint8(int(rgba.A) * a / 255),
-	}
-}
-
-// parseFillColor 解析填充颜色
-// 入参: fillColor 填充颜色节点
-// 返回: color.Color 颜色对象
-func parseFillColor(fillColor *FillColor) color.Color {
-	if fillColor == nil {
-		return nil
-	}
-	if fillColor.Pattern != nil {
-		return nil
-	}
-	if fillColor.AxialShd != nil {
-		return parseAxialShdColor(fillColor.AxialShd, fillColor.Alpha)
-	}
-	if fillColor.RadialShd != nil {
-		return parseRadialShdColor(fillColor.RadialShd, fillColor.Alpha)
-	}
-	if strings.TrimSpace(fillColor.Value) != "" {
-		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
-	}
-	return nil
-}
-
-// parseFillPaint 解析填充画刷
-// 入参: fillColor 填充颜色节点, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
-// 返回: any 填充画刷
-func parseFillPaint(fillColor *FillColor, x, y, pageH, originX, originY float64) any {
-	if fillColor == nil {
-		return nil
-	}
-	if fillColor.Pattern != nil {
-		return nil
-	}
-	if gradient := parseAxialShdGradient(fillColor.AxialShd, fillColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
-		return gradient
-	}
-	if gradient := parseRadialShdGradient(fillColor.RadialShd, fillColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
-		return gradient
-	}
-	if fillColor.AxialShd != nil {
-		return parseAxialShdColor(fillColor.AxialShd, fillColor.Alpha)
-	}
-	if fillColor.RadialShd != nil {
-		return parseRadialShdColor(fillColor.RadialShd, fillColor.Alpha)
-	}
-	if strings.TrimSpace(fillColor.Value) != "" {
-		return parseColorWithAlpha(fillColor.Value, fillColor.Alpha)
-	}
-	return nil
-}
-
-// parseStrokeColor 解析勾边颜色
-// 入参: strokeColor 勾边颜色节点
-// 返回: color.Color 颜色对象
-func parseStrokeColor(strokeColor *StrokeColor) color.Color {
-	if strokeColor == nil {
-		return nil
-	}
-	if strokeColor.AxialShd != nil {
-		return parseAxialShdColor(strokeColor.AxialShd, strokeColor.Alpha)
-	}
-	if strokeColor.RadialShd != nil {
-		return parseRadialShdColor(strokeColor.RadialShd, strokeColor.Alpha)
-	}
-	if strings.TrimSpace(strokeColor.Value) != "" {
-		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
-	}
-	return nil
-}
-
-// parseStrokePaint 解析勾边画刷
-// 入参: strokeColor 勾边颜色节点, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
-// 返回: any 勾边画刷
-func parseStrokePaint(strokeColor *StrokeColor, x, y, pageH, originX, originY float64) any {
-	if strokeColor == nil {
-		return nil
-	}
-	if gradient := parseAxialShdGradient(strokeColor.AxialShd, strokeColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
-		return gradient
-	}
-	if gradient := parseRadialShdGradient(strokeColor.RadialShd, strokeColor.Alpha, x, y, pageH, originX, originY); gradient != nil {
-		return gradient
-	}
-	if strokeColor.AxialShd != nil {
-		return parseAxialShdColor(strokeColor.AxialShd, strokeColor.Alpha)
-	}
-	if strokeColor.RadialShd != nil {
-		return parseRadialShdColor(strokeColor.RadialShd, strokeColor.Alpha)
-	}
-	if strings.TrimSpace(strokeColor.Value) != "" {
-		return parseColorWithAlpha(strokeColor.Value, strokeColor.Alpha)
-	}
-	return nil
-}
-
-// parseAxialShdColor 解析轴向渐变颜色
-// 入参: axialShd 轴向渐变节点, alpha 透明度
-// 返回: color.Color 颜色对象
-func parseAxialShdColor(axialShd *AxialShd, alpha *int) color.Color {
-	if axialShd != nil {
-		for _, segment := range axialShd.Segment {
-			if strings.TrimSpace(segment.Color.Value) == "" {
-				continue
-			}
-			if alpha == nil {
-				alpha = segment.Color.Alpha
-			}
-			return parseColorWithAlpha(segment.Color.Value, alpha)
-		}
-	}
-	return color.Black
-}
-
-// parseAxialShdGradient 解析轴向渐变
-// 入参: axialShd 轴向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
-// 返回: canvas.Gradient 渐变对象
-func parseAxialShdGradient(axialShd *AxialShd, alpha *int, x, y, pageH, originX, originY float64) canvas.Gradient {
-	if axialShd == nil {
-		return nil
-	}
-	start := parseFloats(axialShd.StartPoint)
-	end := parseFloats(axialShd.EndPoint)
-	if len(start) < 2 || len(end) < 2 {
-		return nil
-	}
-	grad := canvas.NewGradient()
-	for _, segment := range axialShd.Segment {
-		if strings.TrimSpace(segment.Color.Value) == "" {
-			continue
-		}
-		segmentAlpha := alpha
-		if segmentAlpha == nil {
-			segmentAlpha = segment.Color.Alpha
-		}
-		grad.Add(segment.Position, colorToRGBA(parseColorWithAlpha(segment.Color.Value, segmentAlpha)))
-	}
-	if len(grad) == 0 {
-		return nil
-	}
-	startPoint := canvas.Point{X: x + start[0] - originX, Y: pageH - (y + start[1]) - originY}
-	endPoint := canvas.Point{X: x + end[0] - originX, Y: pageH - (y + end[1]) - originY}
-	if startPoint.Equals(endPoint) {
-		return nil
-	}
-	return grad.ToLinear(startPoint, endPoint)
-}
-
-// parseRadialShdColor 解析径向渐变颜色
-// 入参: radialShd 径向渐变节点, alpha 透明度
-// 返回: color.Color 颜色对象
-func parseRadialShdColor(radialShd *RadialShd, alpha *int) color.Color {
-	if radialShd != nil {
-		for _, segment := range radialShd.Segment {
-			if strings.TrimSpace(segment.Color.Value) == "" {
-				continue
-			}
-			if alpha == nil {
-				alpha = segment.Color.Alpha
-			}
-			return parseColorWithAlpha(segment.Color.Value, alpha)
-		}
-	}
-	return color.Black
-}
-
-// parseRadialShdGradient 解析径向渐变
-// 入参: radialShd 径向渐变节点, alpha 透明度, x X坐标, y Y坐标, pageH 页面高度, originX 原点X坐标, originY 原点Y坐标
-// 返回: canvas.Gradient 渐变对象
-func parseRadialShdGradient(radialShd *RadialShd, alpha *int, x, y, pageH, originX, originY float64) canvas.Gradient {
-	if radialShd == nil || radialShd.EndRadius <= 0 {
-		return nil
-	}
-	start := parseFloats(radialShd.StartPoint)
-	end := parseFloats(radialShd.EndPoint)
-	if len(start) < 2 || len(end) < 2 {
-		return nil
-	}
-	grad := canvas.NewGradient()
-	for _, segment := range radialShd.Segment {
-		if strings.TrimSpace(segment.Color.Value) == "" {
-			continue
-		}
-		segmentAlpha := alpha
-		if segmentAlpha == nil {
-			segmentAlpha = segment.Color.Alpha
-		}
-		grad.Add(segment.Position, colorToRGBA(parseColorWithAlpha(segment.Color.Value, segmentAlpha)))
-	}
-	if len(grad) == 0 {
-		return nil
-	}
-	startPoint := canvas.Point{X: x + start[0] - originX, Y: pageH - (y + start[1]) - originY}
-	endPoint := canvas.Point{X: x + end[0] - originX, Y: pageH - (y + end[1]) - originY}
-	return grad.ToRadial(startPoint, radialShd.StartRadius, endPoint, radialShd.EndRadius)
-}
-
-// colorToRGBA 转换颜色对象
-// 入参: c 颜色对象
-// 返回: color.RGBA RGBA颜色
-func colorToRGBA(c color.Color) color.RGBA {
-	if rgba, ok := c.(color.RGBA); ok {
-		return rgba
-	}
-	r, g, b, a := c.RGBA()
-	return color.RGBA{R: uint8(r >> 8), G: uint8(g >> 8), B: uint8(b >> 8), A: uint8(a >> 8)}
+	return []rune(value)
 }

 // GetDeltaX 获取X轴偏移量数组
Author	SHA1	Message	Date
xiaoqidun	0887ff1a04	feat(前端界面): 优化单页适高滚动条 build.yaml / build (push) Successful in 47s Details	2026-08-24 09:37:21 +08:00
xiaoqidun	39f4fffeb7	feat(更新依赖): 更新jbig2、canvas build.yaml / build (push) Successful in 44s Details	2026-08-23 21:25:54 +08:00
xiaoqidun	e47d9bdffc	feat(升级依赖): 升级jbig2、canvas build.yaml / build (push) Successful in 3m26s Details	2026-08-21 23:00:56 +08:00
xiaoqidun	3d03448b6c	feat(升级依赖): 更新jbig2和canvas build.yaml / build (push) Successful in 41s Details	2026-07-28 11:52:42 +08:00
xiaoqidun	9462425a25	refactor(重构代码): 专注于性能提升	2026-07-28 11:12:21 +08:00
xiaoqidun	efe3324d4b	feat(系统字体): 添加android系统 build.yaml / build (push) Successful in 40s Details	2026-07-24 17:22:20 +08:00
xiaoqidun	78b66f85fe	style(代码风格): 微调代码风格 build.yaml / build (push) Successful in 38s Details	2026-07-23 20:36:26 +08:00
xiaoqidun	0784a404f8	refactor(重构代码): 提升代码质量	2026-07-23 20:22:10 +08:00
xiaoqidun	c4f7c448f8	feat(清理代码): 清理无效代码 build.yaml / build (push) Successful in 35s Details	2026-07-23 17:01:47 +08:00
xiaoqidun	a60a935f50	feat(字体加载): 优化字体加载 build.yaml / build (push) Successful in 35s Details	2026-07-23 16:19:58 +08:00
xiaoqidun	960bb2b1e0	refactor(重构提升): 提升代码质量 build.yaml / build (push) Successful in 50s Details	2026-07-23 15:51:48 +08:00
xiaoqidun	6aa4e99530	feat(渲染优化): 完善渲染逻辑 build.yaml / build (push) Successful in 34s Details	2026-07-16 11:15:29 +08:00
xiaoqidun	bc02d9e7f6	feat(图像渲染): 优化图像渲染 build.yaml / build (push) Successful in 38s Details	2026-07-15 16:07:20 +08:00
xiaoqidun	e2896381e2	fix(图片渲染): 修复一个图片渲染的回归问题 build.yaml / build (push) Successful in 36s Details	2026-07-15 14:23:04 +08:00
xiaoqidun	e5265a21d5	feat(前端界面): 优化签名展示 build.yaml / build (push) Successful in 37s Details	2026-07-15 12:43:00 +08:00
xiaoqidun	b23ee90d31	feat(签名验证): 完善签名验证功能 build.yaml / build (push) Successful in 38s Details	2026-07-15 12:23:28 +08:00
xiaoqidun	fa0c933f01	fix(字体匹配): 修复一个回归问题 build.yaml / build (push) Successful in 35s Details	2026-07-14 11:19:37 +08:00
xiaoqidun	3fecdbf89e	feat(提升性能): 继续优化性能 build.yaml / build (push) Successful in 36s Details	2026-07-14 10:21:21 +08:00
xiaoqidun	c17aae5a74	feat(优化性能): 提升渲染速度 build.yaml / build (push) Successful in 33s Details	2026-07-14 09:25:41 +08:00
xiaoqidun	08b801d351	feat(优化性能): 继续优化性能 build.yaml / build (push) Successful in 34s Details	2026-07-14 00:24:48 +08:00
xiaoqidun	8a68014262	feat(优化性能): 继续提升性能 build.yaml / build (push) Successful in 34s Details	2026-07-13 23:38:58 +08:00
xiaoqidun	c8c5ce2cfc	feat(前端界面): 调整字段显示顺序 build.yaml / build (push) Successful in 36s Details	2026-07-13 22:32:09 +08:00
xiaoqidun	abc3549f7d	feat(前端界面): 优化横向滚动条 build.yaml / build (push) Successful in 34s Details	2026-07-13 17:19:46 +08:00
xiaoqidun	7d8333b292	feat(前端界面): 优化横向滚动条 build.yaml / build (push) Successful in 34s Details	2026-07-13 17:07:12 +08:00
xiaoqidun	23849aee86	feat(性能优化): 提升速度 build.yaml / build (push) Successful in 34s Details	2026-07-13 16:51:25 +08:00
xiaoqidun	4e651619f8	style(代码风格): 优化代码风格 build.yaml / build (push) Successful in 36s Details	2026-07-13 16:20:01 +08:00
xiaoqidun	1004781aed	feat(提升性能): 更快的加载图片 build.yaml / build (push) Successful in 38s Details	2026-07-13 16:17:08 +08:00
xiaoqidun	19ba4562a1	docs(更新文档): 更新文档 build.yaml / build (push) Successful in 36s Details	2026-07-10 21:13:10 +08:00
xiaoqidun	5b0da8f06b	feat(前端界面): 优化前端签名展示 build.yaml / build (push) Successful in 39s Details	2026-07-10 20:46:51 +08:00
xiaoqidun	4cc24722c2	feat(签名验签): 优化签名验签	2026-07-10 20:39:28 +08:00
xiaoqidun	19fadab4ad	feat(签名验签): 优化签名验签 build.yaml / build (push) Successful in 37s Details	2026-07-10 19:46:44 +08:00
xiaoqidun	c20d3dd246	feat(签名验证): 完善签名签证功能 build.yaml / build (push) Successful in 37s Details	2026-07-10 19:13:19 +08:00
xiaoqidun	a62230eb93	feat(提升性能): 提升JBIG2库性能 build.yaml / build (push) Successful in 39s Details	2026-07-10 16:27:59 +08:00
xiaoqidun	f1a1f2e151	refactor(重构提升): 优化性能 build.yaml / build (push) Successful in 35s Details	2026-07-10 09:19:20 +08:00
xiaoqidun	a1e6a86134	feat(前端界面): 优化前端界面 build.yaml / build (push) Successful in 33s Details	2026-07-09 19:06:22 +08:00
xiaoqidun	f4291aaa74	feat(字体加载): 优化字体加载 build.yaml / build (push) Successful in 34s Details	2026-07-09 17:12:48 +08:00
xiaoqidun	48aabc77ab	feat(前端界面): 优化DPI支持 build.yaml / build (push) Successful in 33s Details	2026-07-09 16:46:48 +08:00
xiaoqidun	ba1da58992	feat(前端界面): 优化前端体验 build.yaml / build (push) Successful in 32s Details	2026-07-09 15:48:54 +08:00
xiaoqidun	1c1173e1b7	feat(前端界面): 优化OFDGo WebUI体验 build.yaml / build (push) Successful in 35s Details	2026-07-09 15:20:57 +08:00
xiaoqidun	368bafccdb	feat(前端界面): OFDGo WebUI移除打印功能 build.yaml / build (push) Successful in 1m27s Details	2026-07-09 15:13:18 +08:00
xiaoqidun	51076634fa	feat(前端界面): OFDGo WebUI支持调用浏览器打印接口直接打印 build.yaml / build (push) Successful in 32s Details	2026-07-09 14:42:17 +08:00
xiaoqidun	7ff1a4269a	feat(前端界面): 优化按比例缩放 build.yaml / build (push) Successful in 33s Details	2026-07-09 14:22:17 +08:00
xiaoqidun	89577ea72f	feat(前端界面): OFDGo WebUI支持设置DPI build.yaml / build (push) Successful in 32s Details	2026-07-09 14:10:25 +08:00
xiaoqidun	3fab819246	feat(前端界面): 统一文案 build.yaml / build (push) Successful in 34s Details	2026-07-09 13:37:56 +08:00
xiaoqidun	38e55d962c	feat(前端界面): 优化前端界面 build.yaml / build (push) Successful in 35s Details	2026-07-09 13:07:59 +08:00
xiaoqidun	5b8b015bfc	feat(前端界面): 优化前端展示 build.yaml / build (push) Successful in 36s Details	2026-07-09 13:02:02 +08:00
xiaoqidun	64536cd49b	feat(前端界面): 优化前端界面展示 build.yaml / build (push) Successful in 34s Details	2026-07-09 12:48:22 +08:00
xiaoqidun	155f5c7299	refactor(重构代码): 拆分代码，提升代码质量 build.yaml / build (push) Successful in 33s Details	2026-07-09 12:17:31 +08:00
xiaoqidun	9eb9104380	refactor(重构代码): 提升代码水平 build.yaml / build (push) Successful in 33s Details	2026-07-09 11:10:47 +08:00
xiaoqidun	fa3260c108	refactor(重构代码): 提升代码质量 build.yaml / build (push) Successful in 34s Details	2026-07-09 10:33:21 +08:00
xiaoqidun	92a53ed3ad	feat(升级依赖): 升级所有依赖	2026-07-09 10:06:54 +08:00
xiaoqidun	65b37b37f0	refactor(文件拆分): 考虑到可维护性进行了文件拆分 build.yaml / build (push) Successful in 35s Details	2026-07-09 00:08:28 +08:00
xiaoqidun	5e4009eca5	feat(字形绘制): 支持更多的字形绘制 build.yaml / build (push) Successful in 35s Details	2026-07-08 23:48:47 +08:00
xiaoqidun	1d99465df2	feat(前端界面): 优化性能 build.yaml / build (push) Successful in 36s Details	2026-07-08 22:23:18 +08:00
xiaoqidun	a665df062b	feat(前端界面): 优化前端性能 build.yaml / build (push) Successful in 35s Details	2026-07-08 22:11:30 +08:00
xiaoqidun	ffd61d6412	feat(前端界面): 重置打开文件状态 build.yaml / build (push) Successful in 33s Details	2026-07-08 21:49:12 +08:00
xiaoqidun	7048bf4cb9	feat(前端界面): 优化OFDGo WebUI适高和适宽 build.yaml / build (push) Successful in 33s Details	2026-07-08 21:40:45 +08:00
xiaoqidun	9199ae02d8	feat(前端界面): 优化OFDGo WebUI适高、适宽 build.yaml / build (push) Successful in 35s Details	2026-07-08 21:19:51 +08:00
xiaoqidun	ef4028a2fc	feat(字体渲染): 改进字体匹配逻辑 build.yaml / build (push) Successful in 35s Details	2026-07-08 20:21:32 +08:00
xiaoqidun	f191f1faec	feat(字体绘制): 优化字体绘制 build.yaml / build (push) Successful in 35s Details	2026-07-08 17:12:39 +08:00
xiaoqidun	5254d22fb3	refactor(字体匹配): 优化字体匹配逻辑 build.yaml / build (push) Successful in 32s Details	2026-07-08 16:34:56 +08:00
xiaoqidun	bb26adfe61	refactor(性能优化): 提升代码质量 build.yaml / build (push) Successful in 35s Details	2026-07-08 16:27:30 +08:00
xiaoqidun	6be7f4b006	refactor(优化代码): 提升代码质量 build.yaml / build (push) Successful in 34s Details	2026-07-08 16:21:02 +08:00
xiaoqidun	2f367e5a19	docs(更新文档): 优化文档描述 build.yaml / build (push) Successful in 34s Details	2026-07-08 16:12:07 +08:00
xiaoqidun	b91c6b5330	docs(更新文档): 添加签名验证部分 build.yaml / build (push) Successful in 34s Details	2026-07-08 15:47:53 +08:00
xiaoqidun	27a5da45ec	refactor(清理代码): 增加可维护性 build.yaml / build (push) Successful in 33s Details	2026-07-08 15:22:05 +08:00
xiaoqidun	cc0a627a3c	feat(前端界面): 优化签章展示 build.yaml / build (push) Successful in 35s Details	2026-07-08 15:07:11 +08:00
xiaoqidun	2aad6818dd	feat(前端界面): 优化签名验签展示 build.yaml / build (push) Successful in 35s Details	2026-07-08 15:02:10 +08:00
xiaoqidun	5c762cf1e6	feat(签名验签): 持续优化签名验签功能 build.yaml / build (push) Successful in 35s Details	2026-07-08 14:51:39 +08:00
xiaoqidun	e4f542c429	feat(前端界面): 优化点击印章处 build.yaml / build (push) Successful in 33s Details	2026-07-08 14:09:45 +08:00
xiaoqidun	d7235a5078	feat(前端界面): 优化签名处点击印章位置 build.yaml / build (push) Successful in 33s Details	2026-07-08 13:59:06 +08:00
xiaoqidun	c1e28bb1a3	feat(签名验签): 优化WebUI签名验签 build.yaml / build (push) Successful in 34s Details	2026-07-08 13:47:19 +08:00
xiaoqidun	725f1315fd	feat(签名验签): 优化签名验签 build.yaml / build (push) Successful in 35s Details	2026-07-08 13:28:49 +08:00
xiaoqidun	b3b8e0bac0	feat(签名验签): 继续优化逻辑 build.yaml / build (push) Successful in 34s Details	2026-07-08 13:12:45 +08:00
xiaoqidun	06c5cea4d1	feat(签名验签): 完善签名验签功能 build.yaml / build (push) Successful in 33s Details	2026-07-08 13:02:08 +08:00
xiaoqidun	6bfb11df71	feat(前端界面): 优化签名展示 build.yaml / build (push) Successful in 33s Details	2026-07-08 11:47:09 +08:00
xiaoqidun	7fbad6005c	feat(更新依赖): 更新canvas版本 build.yaml / build (push) Successful in 36s Details	2026-07-08 11:10:34 +08:00
xiaoqidun	61da0f3f5d	feat(签名展示): OFDGo WebUI支持签名展示 build.yaml / build (push) Successful in 35s Details	2026-07-08 11:02:20 +08:00
xiaoqidun	98b37d865a	feat(签名验签): 支持签名验签	2026-07-08 09:42:16 +08:00
xiaoqidun	28f3efea58	feat(前端界面): 避免偶尔出现的底部横向滚动条 build.yaml / build (push) Successful in 37s Details	2026-07-07 21:47:41 +08:00
xiaoqidun	e3aa8aba77	feat(前端界面): 优化OFDGo WebUI性能 build.yaml / build (push) Successful in 37s Details	2026-07-07 21:35:30 +08:00
xiaoqidun	889a6b1fae	feat(前端界面): 优化前端文案 build.yaml / build (push) Successful in 33s Details	2026-07-07 16:12:02 +08:00
xiaoqidun	73336bcc0e	feat(前端界面): 统一前端界面文案 build.yaml / build (push) Successful in 35s Details	2026-07-07 16:03:25 +08:00
xiaoqidun	67eed80507	feat(前端界面): 统一前端界面文字 build.yaml / build (push) Successful in 37s Details	2026-07-07 15:42:07 +08:00
xiaoqidun	3fd0b1bb5d	feat(前端界面): 优化文案 build.yaml / build (push) Successful in 35s Details	2026-07-07 15:37:42 +08:00
xiaoqidun	3634a6125c	feat(前端界面): 优化WebUI系统字体权限请求 build.yaml / build (push) Successful in 35s Details	2026-07-07 15:30:18 +08:00
xiaoqidun	ebfe7b5d17	feat(前端界面): OFDGo WebUI优化系统字体权限请求	2026-07-07 15:14:25 +08:00