From c3908819bb97ea1ad53a7d09d1e93350459ec71b Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Sat, 26 Sep 2026 10:50:52 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E8=BD=AC=E6=8D=A2=E7=BC=96=E8=BE=91):=20?=
 =?UTF-8?q?=E4=BC=98=E5=8C=96=E8=BD=AC=E6=8D=A2=E4=B8=8E=E7=BC=96=E8=BE=91?=
 =?UTF-8?q?=E5=8A=9F=E8=83=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 assets/webui/index.html         |  6 +++-
 assets/webui/ofdgo.js           | 30 +++++++++++-----
 go.mod                          |  2 +-
 go.sum                          |  4 +--
 internal/webui/webui.go         |  4 +++
 ofdgo_editor.go                 | 19 +++++-----
 ofdgo_editor_metadata.go        | 52 +++++++++++++++++++++------
 ofdgo_editor_open.go            |  5 +--
 ofdgo_editor_package.go         | 18 ++++++++++
 ofdgo_font_type1.go             | 28 +++++++++++----
 ofdgo_image.go                  | 31 +++++++++++-----
 ofdgo_meta.go                   | 21 ++++++-----
 ofdgo_pdf.go                    | 15 ++++----
 ofdgo_pdf_object.go             |  2 +-
 ofdgo_raster_image.go           |  2 +-
 ofdgo_render_compile_image.go   |  9 +++++
 ofdgo_render_output.go          | 64 +++++++++++++++++++++++++++++++--
 ofdgo_renderer_canvas.go        |  5 ++-
 ofdgo_renderer_image_canvas.go  | 34 +++++++++++++++---
 ofdgo_renderer_output_canvas.go | 25 +++++++++++--
 ofdgo_renderer_svg_canvas.go    |  4 +++
 ofdgo_sign_timestamp.go         |  1 +
 ofdgo_writer.go                 |  3 +-
 23 files changed, 303 insertions(+), 81 deletions(-)

diff --git a/assets/webui/index.html b/assets/webui/index.html
index 539a91c..38ca3fb 100644
--- a/assets/webui/index.html
+++ b/assets/webui/index.html
@@ -573,6 +573,10 @@
 						<dt>修改</dt>
 						<dd id="metaModDate"></dd>
 					</div>
+					<div hidden>
+						<dt>软件</dt>
+						<dd id="metaCreator"></dd>
+					</div>
 					<div>
 						<dt>类型</dt>
 						<dd id="metaType">-</dd>
@@ -591,7 +595,7 @@
 					</div>
 				</dl>
 				<details id="conversionNotice" class="conversion-notice" hidden>
-					<summary>转换提示</summary>
+					<summary>提示</summary>
 					<div id="conversionWarnings" class="attachment-detail"></div>
 				</details>
 				<section id="securityPanel" class="security-panel" aria-labelledby="securityPanelTitle" hidden>
diff --git a/assets/webui/ofdgo.js b/assets/webui/ofdgo.js
index d10d623..4308303 100644
--- a/assets/webui/ofdgo.js
+++ b/assets/webui/ofdgo.js
@@ -447,6 +447,7 @@ const el = {
 	metaAuthor: document.querySelector("#metaAuthor"),
 	metaCreationDate: document.querySelector("#metaCreationDate"),
 	metaModDate: document.querySelector("#metaModDate"),
+	metaCreator: document.querySelector("#metaCreator"),
 	metaType: document.querySelector("#metaType"),
 	metaVersion: document.querySelector("#metaVersion"),
 	metaSignatures: document.querySelector("#metaSignatures"),
@@ -2877,15 +2878,19 @@ async function refreshEditorPage(doc, index, openSeq, clearSelection = false) {
 }
 
 function releasePageResources() {
-	const pages = [...state.pageCache.values()];
+	const images = new Set(), fonts = new Set();
+	for (const page of state.pageCache.values()) {
+		for (const name of page.imageNames) images.add(name);
+		for (const font of page.fonts) fonts.add(font.name);
+	}
 	for (const [name, image] of state.svgImages) {
-		if (!pages.some((page) => page.imageNames.includes(name))) {
+		if (!images.has(name)) {
 			URL.revokeObjectURL(image.url);
 			state.svgImages.delete(name);
 		}
 	}
 	for (const [name, font] of state.svgFonts) {
-		if (!pages.some((page) => page.fonts.some((item) => item.name === name))) {
+		if (!fonts.has(name)) {
 			document.fonts.delete(font);
 			state.svgFonts.delete(name);
 		}
@@ -4063,6 +4068,7 @@ async function openDocument(options = {}) {
 }
 
 async function loadDocumentDetails(openSeq) {
+	if (openSeq !== state.openSeq || !state.doc) return;
 	try {
 		const details = await callWASM("ofdgoDocumentInfo");
 		if (openSeq !== state.openSeq) return;
@@ -4766,8 +4772,11 @@ async function processPageRenderQueue() {
 	try {
 		await nextFrame();
 		while (state.pageRenderQueue.length) {
-			state.pageRenderQueue.sort(comparePageRenderTask);
-			const task = state.pageRenderQueue.shift();
+			let next = 0;
+			for (let index = 1; index < state.pageRenderQueue.length; index++) {
+				if (comparePageRenderTask(state.pageRenderQueue[index], state.pageRenderQueue[next]) < 0) next = index;
+			}
+			const [task] = state.pageRenderQueue.splice(next, 1);
 			try {
 				if (task.openSeq !== state.openSeq) {
 					task.resolve(null);
@@ -4778,13 +4787,17 @@ async function processPageRenderQueue() {
 					continue;
 				}
 				const page = await callWASM("ofdgoRenderPage", task.index, state.renderBackend, state.renderDPI, displayMode() === "raster");
+				if (state.pageInFlight.get(task.key) !== task) {
+					task.resolve(null);
+					continue;
+				}
 				const scope = state.composite;
 				if (scope?.index === task.index) {
 					const objects = await callWASM("ofdgoCompositeObjects", task.index, scope.key);
 					if (scope === state.composite && task.openSeq === state.openSeq) scope.objects = objects;
 				}
 				await loadSVGFonts(page.fonts, task.openSeq);
-				if (task.openSeq === state.openSeq) {
+				if (task.openSeq === state.openSeq && state.pageInFlight.get(task.key) === task) {
 					for (const image of page.images) {
 						if (!state.svgImages.has(image.name)) {
 							const blob = new Blob([image.bytes], { type: image.mime });
@@ -4800,7 +4813,7 @@ async function processPageRenderQueue() {
 							return image.decode();
 						}));
 					}
-					if (task.openSeq !== state.openSeq) {
+					if (task.openSeq !== state.openSeq || state.pageInFlight.get(task.key) !== task) {
 						task.resolve(null);
 						continue;
 					}
@@ -4813,7 +4826,7 @@ async function processPageRenderQueue() {
 			} catch (err) {
 				task.reject(err);
 			} finally {
-				state.pageInFlight.delete(task.key);
+				if (state.pageInFlight.get(task.key) === task) state.pageInFlight.delete(task.key);
 			}
 		}
 	} finally {
@@ -6397,6 +6410,7 @@ function renderMeta(keepDetails = false) {
 		[el.metaSubject, (doc.subject || "").trim()],
 		[el.metaCreationDate, formatDocumentTime(doc.creationDate)],
 		[el.metaModDate, formatDocumentTime(doc.modDate)],
+		[el.metaCreator, [doc.creator, doc.creatorVersion].filter(Boolean).join(" ")],
 	]) {
 		field.textContent = value;
 		field.parentElement.hidden = !value;
diff --git a/go.mod b/go.mod
index 131561c..0d0ed3e 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@ require (
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/jbig2 v1.1.1
-	github.com/xiaoqidun/pdfgo v0.0.0-20260926005801-0f4b07fb311c
+	github.com/xiaoqidun/pdfgo v0.0.0-20260926024032-ab5bec77f380
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0
diff --git a/go.sum b/go.sum
index eb8eec1..fb57bff 100644
--- a/go.sum
+++ b/go.sum
@@ -62,8 +62,8 @@ github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/xiaoqidun/jbig2 v1.1.1 h1:SjliS9ZO0e9HX5oYUfBuXrfFsXhWricrSz+XY4zORDI=
 github.com/xiaoqidun/jbig2 v1.1.1/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
-github.com/xiaoqidun/pdfgo v0.0.0-20260926005801-0f4b07fb311c h1:ArBGxLqZghXkkIDtz2UqpsxXPM68qs3qVUqOvW9SkzM=
-github.com/xiaoqidun/pdfgo v0.0.0-20260926005801-0f4b07fb311c/go.mod h1:VnsFG68jDBBkMvQePZTfAyVPq1ykFK5gsExsjVSEhmM=
+github.com/xiaoqidun/pdfgo v0.0.0-20260926024032-ab5bec77f380 h1:NIKpfWSCzRi0ytSS43KFwfV0lxItrepU+QEeab1Yt1w=
+github.com/xiaoqidun/pdfgo v0.0.0-20260926024032-ab5bec77f380/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
 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 v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=
diff --git a/internal/webui/webui.go b/internal/webui/webui.go
index d90b98a..567f465 100644
--- a/internal/webui/webui.go
+++ b/internal/webui/webui.go
@@ -76,6 +76,8 @@ type DocumentInfo struct {
 	CustomData      []ofdgo.CustomData `json:"customData,omitempty"`
 	CreationDate    string             `json:"creationDate"`
 	ModDate         string             `json:"modDate"`
+	Creator         string             `json:"creator"`
+	CreatorVersion  string             `json:"creatorVersion,omitempty"`
 	PageCount       int                `json:"pageCount"`
 	FontCount       int                `json:"fontCount"`
 	SignatureCount  int                `json:"signatureCount"`
@@ -467,6 +469,8 @@ func (s *Session) Summary() DocumentInfo {
 		}
 		info.CreationDate = docInfo.CreationDate
 		info.ModDate = docInfo.ModDate
+		info.Creator = docInfo.Creator
+		info.CreatorVersion = docInfo.CreatorVersion
 	}
 	if fonts, err := s.Reader.Fonts(); err == nil {
 		for _, font := range fonts {
diff --git a/ofdgo_editor.go b/ofdgo_editor.go
index 00d0b7f..8349443 100644
--- a/ofdgo_editor.go
+++ b/ofdgo_editor.go
@@ -156,6 +156,7 @@ func NewEditor() *Editor {
 		Info: DocInfo{
 			DocID:        hex.EncodeToString(id[:]),
 			CreationDate: time.Now().Format("2006-01-02"),
+			Creator:      ofdCreator,
 		},
 		fonts:       make(map[string]*FontResource),
 		images:      make(map[string]image.Point),
@@ -307,14 +308,10 @@ func (e *Editor) DeletePages(indexes []int) error {
 	indexes = slices.Clone(indexes)
 	slices.Sort(indexes)
 	saved := make([]PageContent, len(indexes))
-	for i, index := range indexes {
-		page, err := e.page(index)
-		if err != nil {
-			return err
-		}
-		saved[i] = copyEditorPage(*page)
-	}
 	remove := func(e *Editor) {
+		for i, index := range indexes {
+			saved[i] = copyEditorPage(e.pages[index])
+		}
 		e.removedPages = maps.Clone(e.removedPages)
 		if e.removedPages == nil {
 			e.removedPages = make(map[string]bool)
@@ -377,11 +374,11 @@ func (e *Editor) validatePageIndexes(indexes []int) error {
 // 入参: from 原页面索引, to 移动后的页面索引
 // 返回: error 错误信息
 func (e *Editor) MovePage(from, to int) error {
-	if _, err := e.page(from); err != nil {
-		return err
+	if from < 0 || from >= len(e.pages) {
+		return fmt.Errorf("page index %d out of range", from)
 	}
-	if _, err := e.page(to); err != nil {
-		return err
+	if to < 0 || to >= len(e.pages) {
+		return fmt.Errorf("page index %d out of range", to)
 	}
 	if from == to {
 		return nil
diff --git a/ofdgo_editor_metadata.go b/ofdgo_editor_metadata.go
index 479615a..9fe2a70 100644
--- a/ofdgo_editor_metadata.go
+++ b/ofdgo_editor_metadata.go
@@ -22,25 +22,17 @@ import (
 	"reflect"
 )
 
-// sourceInfoXML 更新公开元数据，保留原创建程序和未识别字段
+// sourceInfoXML 更新文档描述字段，保留未识别内容
 // 返回: []byte 根索引XML, error 错误信息
 func (e *Editor) sourceInfoXML() ([]byte, error) {
 	data, err := e.source.reader.readFile("OFD.xml")
 	if err != nil {
 		return nil, err
 	}
-	root, err := parseEditorXML(data)
+	data, info, err := editorDocInfoXML(data, e.source.fallbackDocID)
 	if err != nil {
 		return nil, err
 	}
-	body := root.child("DocBody")
-	if body == nil {
-		return nil, fmt.Errorf("document has no DocBody")
-	}
-	info := body.child("DocInfo")
-	if info == nil {
-		return nil, fmt.Errorf("document has no DocInfo")
-	}
 	before, after := e.source.info, e.Info
 	var values [][2]string
 	for _, field := range [][3]string{
@@ -54,7 +46,7 @@ func (e *Editor) sourceInfoXML() ([]byte, error) {
 	}
 	data = editorXMLSetText(data, info, values)
 	if !reflect.DeepEqual(before.CustomDatas, after.CustomDatas) {
-		root, err = parseEditorXML(data)
+		root, err := parseEditorXML(data)
 		if err != nil {
 			return nil, err
 		}
@@ -63,6 +55,44 @@ func (e *Editor) sourceInfoXML() ([]byte, error) {
 	return data, nil
 }
 
+// editorCreatorXML 更新首份文档的制作软件，移除原软件版本，保留其余根索引内容
+// 入参: data 当前根索引XML, docID 缺少文档描述时使用的标识
+// 返回: []byte 修改后的XML, error 解析错误
+func editorCreatorXML(data []byte, docID string) ([]byte, error) {
+	data, info, err := editorDocInfoXML(data, docID)
+	if err != nil {
+		return nil, err
+	}
+	return editorXMLSetText(data, info, [][2]string{{"Creator", ofdCreator}, {"CreatorVersion", ""}}), nil
+}
+
+// editorDocInfoXML 获取文档描述，修改缺少描述的源文件时补建标准容器及标识
+// 入参: data 根索引XML, docID 缺少文档描述时使用的标识
+// 返回: []byte 根索引XML, *editorXML 描述节点, error 解析错误
+func editorDocInfoXML(data []byte, docID string) ([]byte, *editorXML, error) {
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, nil, err
+	}
+	body := root.child("DocBody")
+	if body == nil {
+		return nil, nil, fmt.Errorf("document has no DocBody")
+	}
+	if info := body.child("DocInfo"); info != nil {
+		return data, info, nil
+	}
+	info, err := editorXMLContainer("DocInfo", nil, editorXMLText("DocID", docID))
+	if err != nil {
+		return nil, nil, err
+	}
+	data = editorPatchXML(data, []editorXMLPatch{{body.open, body.open, info}})
+	root, err = parseEditorXML(data)
+	if err != nil {
+		return nil, nil, err
+	}
+	return data, root.child("DocBody").child("DocInfo"), nil
+}
+
 // editorCustomDatas 更新自定义字段，保留原字段及容器的扩展内容
 // 入参: data 原XML, info 文档信息节点, values 新字段
 // 返回: []byte 修改后的XML, error 编码错误
diff --git a/ofdgo_editor_open.go b/ofdgo_editor_open.go
index 1fd840f..50d0b4f 100644
--- a/ofdgo_editor_open.go
+++ b/ofdgo_editor_open.go
@@ -34,6 +34,7 @@ type editorSource struct {
 	reader           *Reader
 	document         *Document
 	info             DocInfo
+	fallbackDocID    string
 	directory        string
 	pages            map[string]*editorSourcePage
 	origins          map[string]*editorObjectOrigin
@@ -142,9 +143,9 @@ func (r *Reader) Editor() (*Editor, error) {
 	}
 	e := NewEditor()
 	e.encryption = r.encryption
-	e.Info, e.maxID = cloneEditorData(*info), maximum
 	directory := cleanPackagePath(reader.RootDir)
-	e.source = &editorSource{reader: reader, document: doc, info: cloneEditorData(*info), directory: directory, pages: make(map[string]*editorSourcePage, len(doc.Pages.Page)), origins: make(map[string]*editorObjectOrigin)}
+	e.source = &editorSource{reader: reader, document: doc, info: cloneEditorData(*info), fallbackDocID: e.Info.DocID, directory: directory, pages: make(map[string]*editorSourcePage, len(doc.Pages.Page)), origins: make(map[string]*editorObjectOrigin)}
+	e.Info, e.maxID = cloneEditorData(*info), maximum
 	e.pages = make([]PageContent, len(doc.Pages.Page))
 	sourcePages := make([]editorSourcePage, len(doc.Pages.Page))
 	for i, page := range doc.Pages.Page {
diff --git a/ofdgo_editor_package.go b/ofdgo_editor_package.go
index 1d8c9da..8a1ac0e 100644
--- a/ofdgo_editor_package.go
+++ b/ofdgo_editor_package.go
@@ -450,6 +450,24 @@ func (e *Editor) writeSource(writer io.Writer, fonts map[string][]byte, progress
 		return 0, err
 	}
 	reader := e.source.reader
+	if len(parts) != 0 || len(removed) != 0 {
+		name := "OFD.xml"
+		if file, ok := reader.packageFile(name); ok {
+			name = cleanPackagePath(file.Name)
+		}
+		data, ok := parts[name]
+		if !ok {
+			data, err = reader.readFile(name)
+			if err != nil {
+				return 0, err
+			}
+		}
+		data, err = editorCreatorXML(data, e.source.fallbackDocID)
+		if err != nil {
+			return 0, err
+		}
+		parts[name] = data
+	}
 	remaining := maps.Clone(reader.files)
 	if remaining == nil {
 		remaining = make(map[string][]byte)
diff --git a/ofdgo_font_type1.go b/ofdgo_font_type1.go
index 4ee13ee..013ac13 100644
--- a/ofdgo_font_type1.go
+++ b/ofdgo_font_type1.go
@@ -23,17 +23,20 @@ import (
 	"strconv"
 )
 
+// type1Program 保存解密后的Type1字形与子程序
 type type1Program struct {
 	glyphs []type1Glyph
 	subrs  [][]byte
 	lenIV  int
 }
 
+// type1Glyph 保存字形名称及指令
 type type1Glyph struct {
 	name string
 	data []byte
 }
 
+// type1Scanner 按词项和显式长度读取Type1程序
 type type1Scanner struct {
 	data []byte
 	pos  int
@@ -235,10 +238,12 @@ func type1HexEncoded(data []byte) bool {
 	return false
 }
 
+// type1HexDigit 判断字节是否为十六进制数字
 func type1HexDigit(value byte) bool {
 	return value >= '0' && value <= '9' || value >= 'a' && value <= 'f' || value >= 'A' && value <= 'F'
 }
 
+// type1Space 判断PostScript空白字节
 func type1Space(value byte) bool {
 	return value == ' ' || value == '\t' || value == '\r' || value == '\n' || value == '\f' || value == 0
 }
@@ -293,10 +298,12 @@ func (s *type1Scanner) binary(length int) ([]byte, error) {
 	return data, nil
 }
 
+// type1BinaryStart 判断Type1二进制数据起始操作符
 func type1BinaryStart(token string) bool {
 	return token == "RD" || token == "-|"
 }
 
+// type1Outline 保存字形指令的操作数栈及轮廓位置
 type type1Outline struct {
 	program    *type1Program
 	args       []float64
@@ -381,9 +388,10 @@ func (s *type1Outline) run(data []byte, depth int) (bool, error) {
 			if len(s.args) == 0 {
 				return false, fmt.Errorf("Type1 callsubr has no index")
 			}
-			index := int(s.args[len(s.args)-1])
+			value := s.args[len(s.args)-1]
+			index := int(value)
 			s.args = s.args[:len(s.args)-1]
-			if index < 0 || index >= len(s.program.subrs) || s.program.subrs[index] == nil {
+			if value != float64(index) || index < 0 || index >= len(s.program.subrs) || s.program.subrs[index] == nil {
 				return false, fmt.Errorf("invalid Type1 subroutine index %d", index)
 			}
 			ended, err := s.run(s.program.subrs[index], depth+1)
@@ -413,9 +421,12 @@ func (s *type1Outline) run(data []byte, depth int) (bool, error) {
 // 返回: error 错误信息
 func (s *type1Outline) operator(op int) error {
 	a := s.args
-	s.args = nil
+	s.args = a[:0]
 	switch op {
-	case 1, 3, 1200, 1201, 1202:
+	case 1200:
+		s.args = a
+		return nil
+	case 1, 3, 1201, 1202:
 		return nil
 	case 13:
 		if s.defined || len(a) != 2 {
@@ -501,18 +512,21 @@ func (s *type1Outline) operator(op int) error {
 	case 9:
 		s.open = false
 	case 1212:
-		if len(a) != 2 || a[1] == 0 {
+		if len(a) < 2 || a[len(a)-1] == 0 {
 			return fmt.Errorf("invalid Type1 division")
 		}
-		s.args = []float64{a[0] / a[1]}
+		a[len(a)-2] /= a[len(a)-1]
+		s.args = a[:len(a)-1]
 	case 1216:
 		if len(a) < 2 {
 			return fmt.Errorf("invalid Type1 callothersubr")
 		}
 		count, number := int(a[len(a)-2]), int(a[len(a)-1])
-		if count < 0 || count != len(a)-2 {
+		if float64(count) != a[len(a)-2] || float64(number) != a[len(a)-1] || count < 0 || count > len(a)-2 {
 			return fmt.Errorf("invalid Type1 callothersubr arguments")
 		}
+		s.args = a[:len(a)-count-2]
+		a = a[len(a)-count-2 : len(a)-2]
 		switch number {
 		case 0:
 			if !s.flex || count != 3 || len(s.flexPoints) != 7 {
diff --git a/ofdgo_image.go b/ofdgo_image.go
index 27e090d..cc8d6ba 100644
--- a/ofdgo_image.go
+++ b/ofdgo_image.go
@@ -109,6 +109,9 @@ func decodeBMPImage(data []byte) (image.Image, error) {
 	if compression != 0 {
 		return nil, fmt.Errorf("unsupported bmp compression")
 	}
+	if bpp != 16 && bpp != 24 && bpp != 32 {
+		return nil, fmt.Errorf("unsupported bmp depth")
+	}
 	topDown := height < 0
 	if topDown {
 		height = -height
@@ -116,10 +119,11 @@ func decodeBMPImage(data []byte) (image.Image, error) {
 	if width <= 0 || height <= 0 {
 		return nil, fmt.Errorf("invalid bmp size")
 	}
-	rowStride := ((width*int(bpp) + 31) / 32) * 4
-	if offset+rowStride*height > len(data) {
+	stride := ((int64(width)*int64(bpp) + 31) / 32) * 4
+	if stride > int64(len(data)-offset)/int64(height) {
 		return nil, fmt.Errorf("truncated bmp")
 	}
+	rowStride := int(stride)
 	img := image.NewNRGBA(image.Rect(0, 0, width, height))
 	for y := 0; y < height; y++ {
 		srcY := y
@@ -143,8 +147,6 @@ func decodeBMPImage(data []byte) (image.Image, error) {
 			case 32:
 				p := x * 4
 				img.SetNRGBA(x, y, color.NRGBA{R: row[p+2], G: row[p+1], B: row[p], A: 255})
-			default:
-				return nil, fmt.Errorf("unsupported bmp")
 			}
 		}
 	}
@@ -163,12 +165,15 @@ func parseBMPHeader(data []byte) (int, int, int, uint16, uint32, error) {
 	if dibSize < 40 {
 		return 0, 0, 0, 0, 0, fmt.Errorf("unsupported bmp")
 	}
+	if uint64(dibSize)+14 > uint64(len(data)) || offset < 0 || uint64(offset) < uint64(dibSize)+14 || offset > len(data) {
+		return 0, 0, 0, 0, 0, fmt.Errorf("invalid bmp pixel offset")
+	}
 	width := int(int32(binary.LittleEndian.Uint32(data[18:22])))
 	height := int(int32(binary.LittleEndian.Uint32(data[22:26])))
 	planes := binary.LittleEndian.Uint16(data[26:28])
 	bpp := binary.LittleEndian.Uint16(data[28:30])
 	compression := binary.LittleEndian.Uint32(data[30:34])
-	if planes != 1 {
+	if planes != 1 || width <= 0 || height == 0 || int64(height) == -int64(^uint(0)>>1)-1 {
 		return 0, 0, 0, 0, 0, fmt.Errorf("invalid bmp")
 	}
 	return offset, width, height, bpp, compression, nil
@@ -260,14 +265,22 @@ func imageWithAlpha(img image.Image, alpha *int) image.Image {
 // 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.(interface{ Image() (image.Image, error) }); ok {
-		if decoded, err := src.Image(); err == nil {
-			return decoded
-		}
+	if decoded, err := imagePixelData(img); err == nil {
+		return decoded
 	}
 	return img
 }
 
+// imagePixelData 获取像素并保留惰性解码错误，供绘制和像素处理入口校验
+// 入参: img 图片对象
+// 返回: image.Image 解码像素, error 解码错误
+func imagePixelData(img image.Image) (image.Image, error) {
+	if src, ok := img.(interface{ Image() (image.Image, error) }); ok {
+		return src.Image()
+	}
+	return img, nil
+}
+
 // imageGrayAt 获取图片灰度像素
 // 入参: img 图片对象, x X坐标, y Y坐标
 // 返回: color.Gray 灰度像素
diff --git a/ofdgo_meta.go b/ofdgo_meta.go
index 36f1fd7..0c3aa1a 100644
--- a/ofdgo_meta.go
+++ b/ofdgo_meta.go
@@ -16,6 +16,9 @@ package ofdgo
 
 import "encoding/xml"
 
+// ofdCreator 标识本库生成的文档
+const ofdCreator = "xiaoqidun/ofdgo"
+
 // OFD OFD入口结构
 // 代表OFD文档的根节点
 type OFD struct {
@@ -35,14 +38,16 @@ type DocBody struct {
 
 // DocInfo 文档元数据
 type DocInfo struct {
-	DocID        string       `xml:"DocID"`
-	Title        string       `xml:"Title"`
-	Author       string       `xml:"Author"`
-	Subject      string       `xml:"Subject"`
-	Abstract     string       `xml:"Abstract"`
-	CreationDate string       `xml:"CreationDate"`
-	ModDate      string       `xml:"ModDate"`
-	CustomDatas  *CustomDatas `xml:"CustomDatas"`
+	DocID          string       `xml:"DocID"`
+	Title          string       `xml:"Title"`
+	Author         string       `xml:"Author"`
+	Subject        string       `xml:"Subject"`
+	Abstract       string       `xml:"Abstract"`
+	CreationDate   string       `xml:"CreationDate"`
+	ModDate        string       `xml:"ModDate"`
+	Creator        string       `xml:"Creator"`
+	CreatorVersion string       `xml:"CreatorVersion"`
+	CustomDatas    *CustomDatas `xml:"CustomDatas"`
 }
 
 // CustomDatas 自定义数据集合
diff --git a/ofdgo_pdf.go b/ofdgo_pdf.go
index 5dce6d1..a6f227f 100644
--- a/ofdgo_pdf.go
+++ b/ofdgo_pdf.go
@@ -69,6 +69,7 @@ type pdfImporter struct {
 	pageWidth       float64
 	pageHeight      float64
 	pendingPath     *pdfgo.PathMark
+	warning         func(pdfgo.Diagnostic)
 }
 
 // ImportPDF 将PDF内容转换为独立OFD编辑文档，失败时不返回部分结果
@@ -92,6 +93,12 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		editor.SetRenderBackends(*options.Backends)
 	}
 	importer := pdfImporter{ctx: ctx, reader: reader, editor: editor, fontIDs: map[*pdfgo.Font]string{}, fontMetrics: map[string]FontMetrics{}, pages: map[pdfgo.Reference]*pdfgo.Page{}, pageIDs: map[pdfgo.Reference]string{}}
+	if !options.Strict {
+		importer.warning = func(warning pdfgo.Diagnostic) {
+			warning.Page = importer.page + 1
+			importer.report.Warnings = append(importer.report.Warnings, warning)
+		}
+	}
 	if options.OnProgress != nil {
 		if err := options.OnProgress("pages", 0, 0); err != nil {
 			return nil, PDFImportReport{}, err
@@ -126,16 +133,10 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		importer.pageHeight = height
 		importer.maskClips = make(map[*pdfgo.SoftMask]pdfgo.Path)
 		importer.clipTexts = make(map[*pdfgo.TextClip]TextObject)
-		visitor := pdfgo.Visitor{Path: importer.path, Text: importer.text, Image: importer.image}
+		visitor := pdfgo.Visitor{Path: importer.path, Text: importer.text, Image: importer.image, Warning: importer.warning}
 		visitor.Group = func(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
 			return importer.group(mark, walk, visitor)
 		}
-		if !options.Strict {
-			visitor.Warning = func(warning pdfgo.Diagnostic) {
-				warning.Page = index + 1
-				importer.report.Warnings = append(importer.report.Warnings, warning)
-			}
-		}
 		if err := reader.WalkPage(ctx, page, visitor); err != nil {
 			return fmt.Errorf("import PDF page %d: %w", index+1, err)
 		}
diff --git a/ofdgo_pdf_object.go b/ofdgo_pdf_object.go
index 6ebb72e..980f9c7 100644
--- a/ofdgo_pdf_object.go
+++ b/ofdgo_pdf_object.go
@@ -148,7 +148,7 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 		if err := p.flushPath(); err != nil {
 			return err
 		}
-		visitor := pdfgo.Visitor{Path: p.path, Image: p.image}
+		visitor := pdfgo.Visitor{Path: p.path, Image: p.image, Warning: p.warning}
 		visitor.Group = func(group pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
 			return p.group(group, walk, visitor)
 		}
diff --git a/ofdgo_raster_image.go b/ofdgo_raster_image.go
index b5aaca5..140f991 100644
--- a/ofdgo_raster_image.go
+++ b/ofdgo_raster_image.go
@@ -21,7 +21,7 @@ import (
 	"golang.org/x/image/math/f64"
 )
 
-// drawRasterImage 按页面变换采样图像，两后端共享相同的高质量图像插值
+// drawRasterImage 按页面变换对图像执行高质量采样
 // 入参: dst 目标图像, src 源图像, m 像素坐标变换
 func drawRasterImage(dst draw.Image, src image.Image, m RasterMatrix) {
 	draw.CatmullRom.Transform(dst, f64.Aff3{m[0], m[2], m[4], m[1], m[3], m[5]}, src, src.Bounds(), draw.Over, nil)
diff --git a/ofdgo_render_compile_image.go b/ofdgo_render_compile_image.go
index 231dcf9..76d4668 100644
--- a/ofdgo_render_compile_image.go
+++ b/ofdgo_render_compile_image.go
@@ -56,8 +56,17 @@ func (c *semanticCompiler) imageObject(object ImageObject, state RenderState) er
 		if err != nil {
 			return err
 		}
+		if object.ImageMask != "" || object.Alpha != nil && *object.Alpha < 255 {
+			img, err = imagePixelData(img)
+			if err != nil {
+				return err
+			}
+		}
 		if object.ImageMask != "" {
 			mask, err := c.renderer.ImageResource(object.ImageMask)
+			if err == nil {
+				mask, err = imagePixelData(mask)
+			}
 			if err != nil {
 				return err
 			}
diff --git a/ofdgo_render_output.go b/ofdgo_render_output.go
index 5654394..37b8ea6 100644
--- a/ofdgo_render_output.go
+++ b/ofdgo_render_output.go
@@ -16,7 +16,9 @@ package ofdgo
 
 import (
 	"archive/zip"
+	"encoding/binary"
 	"fmt"
+	"hash/crc32"
 	"image"
 	"image/jpeg"
 	"image/png"
@@ -27,6 +29,53 @@ import (
 	"golang.org/x/image/draw"
 )
 
+// creatorXMP 记录独立导出文件的制作软件
+const creatorXMP = `<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"><rdf:Description rdf:about="" xmlns:xmp="http://ns.adobe.com/xap/1.0/"><xmp:CreatorTool>` + ofdCreator + `</xmp:CreatorTool></rdf:Description></rdf:RDF>`
+
+// imageMetadataWriter 在图像固定头之后插入元数据，不缓存图像主体
+type imageMetadataWriter struct {
+	writer io.Writer
+	skip   int
+	data   []byte
+}
+
+// Write 交付图像数据并在头部边界写入元数据
+// 入参: data 编码后的图像片段
+// 返回: int 已处理字节数, error 写入错误
+func (w *imageMetadataWriter) Write(data []byte) (int, error) {
+	n := 0
+	if w.skip > 0 {
+		size := min(w.skip, len(data))
+		written, err := w.writer.Write(data[:size])
+		n, w.skip = written, w.skip-written
+		data = data[written:]
+		if err != nil {
+			return n, err
+		}
+		if written != size {
+			return n, io.ErrShortWrite
+		}
+	}
+	if w.skip == 0 && w.data != nil {
+		written, err := w.writer.Write(w.data)
+		if err != nil {
+			return n, err
+		}
+		if written != len(w.data) {
+			return n, io.ErrShortWrite
+		}
+		w.data = nil
+	}
+	if len(data) == 0 {
+		return n, nil
+	}
+	written, err := w.writer.Write(data)
+	if err == nil && written != len(data) {
+		err = io.ErrShortWrite
+	}
+	return n + written, err
+}
+
 // RenderTo 按格式渲染单页，JPEG使用95画质
 // 入参: page 页面内容, writer 输出流, format svg、pdf、eps、png、jpg、jpeg或txt
 // 返回: error 错误信息
@@ -189,7 +238,13 @@ func (r *Renderer) RenderToPNG(page *PageContent, writer io.Writer) error {
 	if err != nil {
 		return err
 	}
-	return png.Encode(writer, img)
+	text := []byte("Software\x00" + ofdCreator)
+	chunk := make([]byte, len(text)+12)
+	binary.BigEndian.PutUint32(chunk, uint32(len(text)))
+	copy(chunk[4:], "tEXt")
+	copy(chunk[8:], text)
+	binary.BigEndian.PutUint32(chunk[len(chunk)-4:], crc32.ChecksumIEEE(chunk[4:len(chunk)-4]))
+	return png.Encode(&imageMetadataWriter{writer: writer, skip: 33, data: chunk}, img)
 }
 
 // RenderToJPEG 渲染为白底JPEG，像素尺寸由DPI决定
@@ -200,7 +255,12 @@ func (r *Renderer) RenderToJPEG(page *PageContent, writer io.Writer, options *jp
 	if err != nil {
 		return err
 	}
-	return jpeg.Encode(writer, fillWhiteBackground(img), options)
+	metadata := []byte("http://ns.adobe.com/xap/1.0/\x00" + creatorXMP)
+	segment := make([]byte, len(metadata)+4)
+	segment[0], segment[1] = 0xff, 0xe1
+	binary.BigEndian.PutUint16(segment[2:], uint16(len(metadata)+2))
+	copy(segment[4:], metadata)
+	return jpeg.Encode(&imageMetadataWriter{writer: writer, skip: 2, data: segment}, fillWhiteBackground(img), options)
 }
 
 // fillWhiteBackground 填充白色背景，复用当前导出图片的RGBA像素
diff --git a/ofdgo_renderer_canvas.go b/ofdgo_renderer_canvas.go
index 58a36a5..8a139cd 100644
--- a/ofdgo_renderer_canvas.go
+++ b/ofdgo_renderer_canvas.go
@@ -64,7 +64,10 @@ func (b CanvasBackend) Render(page *RasterPage) (image.Image, error) {
 	masks := renderCache[[32]byte, *image.Alpha]{limit: 16 << 20}
 	for i, cmd := range page.Commands {
 		if cmd.Image != nil {
-			source := cmd.Image
+			source, err := imagePixelData(cmd.Image)
+			if err != nil {
+				return nil, fmt.Errorf("canvas image %d: %w", i, err)
+			}
 			if _, linear := space.(canvas.LinearColorSpace); !linear {
 				converted := image.NewRGBA(source.Bounds())
 				for y := source.Bounds().Min.Y; y < source.Bounds().Max.Y; y++ {
diff --git a/ofdgo_renderer_image_canvas.go b/ofdgo_renderer_image_canvas.go
index 95a2fea..dd25023 100644
--- a/ofdgo_renderer_image_canvas.go
+++ b/ofdgo_renderer_image_canvas.go
@@ -35,23 +35,38 @@ func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float
 		r.measureImage(ctx, obj, pageH, parentCTM, boundaryInCTM, parentClip)
 		return
 	}
-	if obj.Visible != nil && !*obj.Visible {
+	if obj.Visible != nil && !*obj.Visible || obj.Alpha != nil && *obj.Alpha == 0 {
 		return
 	}
 	resPath, ok := r.Reader.ResMap[obj.ResourceID]
 	if !ok {
+		r.renderError = fmt.Errorf("image resource %q not found", obj.ResourceID)
 		return
 	}
 	img, err := r.decodeImageResource(resPath)
 	if err != nil {
+		r.renderError = err
 		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)
+	if obj.ImageMask != "" || obj.Alpha != nil && *obj.Alpha < 255 {
+		img, err = imagePixelData(img)
+		if err != nil {
+			r.renderError = err
+			return
 		}
 	}
+	if obj.ImageMask != "" {
+		mask, err := r.ImageResource(obj.ImageMask)
+		if err == nil {
+			mask, err = imagePixelData(mask)
+		}
+		if err != nil {
+			r.renderError = err
+			return
+		}
+		img = imageWithMask(img, mask)
+	}
 	img = imageWithAlpha(img, obj.Alpha)
 	imgBounds := img.Bounds()
 	imgW, imgH := float64(imgBounds.Dx()), float64(imgBounds.Dy())
@@ -82,6 +97,9 @@ func (r *Renderer) renderImage(ctx *canvas.Context, obj ImageObject, pageH float
 	}
 	clipPath := intersectClipPath(parentClip, r.buildObjectClipPath(obj.Clips, pageH, box.X, box.Y, localCTM, parentCTM, boundaryInCTM))
 	img = r.imageWithClip(img, clipPath, m, 96)
+	if r.renderError != nil {
+		return
+	}
 	m = m.Scale(imgW/float64(img.Bounds().Dx()), imgH/float64(img.Bounds().Dy()))
 	img, pad := imageWithTransparentEdge(img)
 	if pad > 0 {
@@ -158,6 +176,12 @@ func (r *Renderer) imageWithClip(img image.Image, clipPath *canvas.Path, m canva
 	} else if clipPath.Contains(imagePath) {
 		return img
 	}
+	source, err := imagePixelData(img)
+	if err != nil {
+		r.renderError = err
+		return img
+	}
+	img = source
 	scale := math.Max(math.Hypot(m[0][0], m[1][0]), math.Hypot(m[0][1], m[1][1])) * dpi / 25.4
 	scale = math.Min(scale, math.Sqrt((16<<20)/(float64(w)*float64(h))))
 	if scale > 1 {
@@ -195,7 +219,7 @@ func (r *Renderer) imageWithClip(img image.Image, clipPath *canvas.Path, m canva
 	if mask.Opaque() {
 		return img
 	}
-	source := imagePixelSource(img)
+	source = img
 	out := &image.NRGBA{Pix: mask.Pix, Stride: mask.Stride, Rect: bounds}
 	if src, ok := source.(*image.NRGBA); ok {
 		for y := 0; y < h; y++ {
diff --git a/ofdgo_renderer_output_canvas.go b/ofdgo_renderer_output_canvas.go
index 3d6aaae..c143ff2 100644
--- a/ofdgo_renderer_output_canvas.go
+++ b/ofdgo_renderer_output_canvas.go
@@ -44,6 +44,7 @@ func (CanvasBackend) RenderSVG(r *Renderer, page *PageContent, writer io.Writer,
 		}
 		buffer := bufio.NewWriter(writer)
 		renderer := svg.New(buffer, c.W, c.H, nil)
+		io.WriteString(buffer, svgCreatorMetadata)
 		c.RenderTo(renderer)
 		if err := renderer.Close(); err != nil {
 			return SVGResources{}, err
@@ -65,7 +66,7 @@ func (CanvasBackend) RenderEPS(r *Renderer, page *PageContent, writer io.Writer)
 	options := ps.DefaultOptions
 	options.Format = ps.EncapsulatedPostScript
 	buffer := bufio.NewWriter(writer)
-	renderer := ps.New(buffer, c.W, c.H, &options)
+	renderer := ps.New(canvasEPSWriter{buffer}, c.W, c.H, &options)
 	c.RenderTo(renderer)
 	if err := renderer.Close(); err != nil {
 		return err
@@ -73,6 +74,24 @@ func (CanvasBackend) RenderEPS(r *Renderer, page *PageContent, writer io.Writer)
 	return buffer.Flush()
 }
 
+// canvasEPSWriter 在EPS头部写入本库制作软件，不改动绘图内容
+type canvasEPSWriter struct {
+	io.Writer
+}
+
+// Write 写入EPS片段并替换独立的制作软件声明
+// 入参: data EPS片段
+// 返回: int 已处理字节数, error 写入错误
+func (w canvasEPSWriter) Write(data []byte) (int, error) {
+	if bytes.Equal(data, []byte("%%Creator: tdewolff/canvas\n")) {
+		if _, err := io.WriteString(w.Writer, "%%Creator: "+ofdCreator+"\n"); err != nil {
+			return 0, err
+		}
+		return len(data), nil
+	}
+	return w.Writer.Write(data)
+}
+
 // RenderPDF 使用canvas输出PDF，保留导航与文字并复用输出缓冲
 // 入参: r 渲染器, pages 页面列表, writer 输出流, progress 页面处理进度
 // 返回: error 错误信息
@@ -95,7 +114,7 @@ func (CanvasBackend) RenderPDF(r *Renderer, pages []RenderDocumentPage, writer i
 	if docInfo, err := r.Reader.DocInfo(); err == nil {
 		info = *docInfo
 	}
-	p.SetInfo(info.Title, info.Subject, "", info.Author, "xiaoqidun/ofdgo")
+	p.SetInfo(info.Title, info.Subject, "", info.Author, ofdCreator)
 	for i, page := range pages {
 		if i > 0 {
 			p.NewPage(page.Box.W, page.Box.H)
@@ -134,7 +153,7 @@ func replacePDFProducer(data []byte) []byte {
 	if idx < 0 {
 		return data
 	}
-	dst := []byte("/Producer(xiaoqidun/ofdgo)")
+	dst := []byte("/Producer(" + ofdCreator + ")")
 	copy(data[idx:idx+len(old)], dst)
 	return data
 }
diff --git a/ofdgo_renderer_svg_canvas.go b/ofdgo_renderer_svg_canvas.go
index fcc20fc..f4e8688 100644
--- a/ofdgo_renderer_svg_canvas.go
+++ b/ofdgo_renderer_svg_canvas.go
@@ -30,6 +30,9 @@ import (
 	"github.com/tdewolff/canvas/renderers/svg"
 )
 
+// svgCreatorMetadata 记录SVG制作软件，不参与页面绘制
+const svgCreatorMetadata = `<metadata>` + creatorXMP + `</metadata>`
+
 // svgResourceRenderer 分离外部资源的SVG渲染器
 type svgResourceRenderer struct {
 	*svg.SVG
@@ -69,6 +72,7 @@ func (r *Renderer) renderSVGResources(page *PageContent, writer io.Writer, image
 		writer:   buffer,
 		seen:     make(map[string]bool),
 	}
+	io.WriteString(buffer, svgCreatorMetadata)
 	if images {
 		s.imageNames = make(map[image.Image]string)
 	}
diff --git a/ofdgo_sign_timestamp.go b/ofdgo_sign_timestamp.go
index bf723ab..7560023 100644
--- a/ofdgo_sign_timestamp.go
+++ b/ofdgo_sign_timestamp.go
@@ -76,6 +76,7 @@ type SignatureTimestampReport struct {
 	Error              string
 }
 
+// signatureTimestampEvidence 保存时间戳令牌及其绑定数据
 type signatureTimestampEvidence struct {
 	Token []byte
 	Data  []byte
diff --git a/ofdgo_writer.go b/ofdgo_writer.go
index 17b6cdf..48b2323 100644
--- a/ofdgo_writer.go
+++ b/ofdgo_writer.go
@@ -48,6 +48,7 @@ func (progress editorProgress) report(stage string, completed, total int) error
 // WriteTo 逐个条目写出OFD，不关闭调用方输出流，出错时应丢弃本次输出
 // 新增资源仅写入实际引用的部分，静态TrueType轮廓字体按实际文字生成子集
 // 原有字体在全包引用可确定时保留字形编号裁剪；编辑资源、复杂字体及无法确定的引用保持原样
+// 制作软件统一为xiaoqidun/ofdgo，未修改的文档保留原制作软件及版本
 // 重开子集文档后输入未包含的文字，需要通过AddFont注册完整字体并替换原字体引用
 // 入参: writer 输出流
 // 返回: int64 已写入字节数, error 错误信息
@@ -251,7 +252,7 @@ func (e *Editor) writeParts(write func(string, []byte, bool) error, progress edi
 			{"DocID", e.Info.DocID}, {"Title", e.Info.Title}, {"Author", e.Info.Author},
 			{"Subject", e.Info.Subject}, {"Abstract", e.Info.Abstract},
 			{"CreationDate", e.Info.CreationDate}, {"ModDate", e.Info.ModDate},
-			{"Creator", "xiaoqidun/ofdgo"},
+			{"Creator", ofdCreator},
 		} {
 			if field[1] != "" {
 				x.text(field[0], field[1])