feat(转换能力): 完善PDF转换与链接保留，优化大型文档处理，新增转换提示

assets/webui/index.html

@@ -590,6 +590,10 @@
 						<dd id="metaFonts">0</dd>
 					</div>
 				</dl>
+				<details id="conversionNotice" class="conversion-notice" hidden>
+					<summary>转换提示</summary>
+					<div id="conversionWarnings" class="attachment-detail"></div>
+				</details>
 				<section id="securityPanel" class="security-panel" aria-labelledby="securityPanelTitle" hidden>
 					<div class="panel-row"><div id="securityPanelTitle" class="panel-title compact">安全</div><div class="panel-actions"><button id="encryptSaveButton" class="small-button" type="button" title="加密另存" aria-label="加密另存" aria-haspopup="dialog" aria-controls="exportPanel" disabled>加密</button><button id="signButton" class="small-button" type="button" aria-haspopup="dialog" aria-controls="signPanel" disabled>签章</button><button id="verifyButton" class="small-button" type="button" aria-haspopup="dialog" aria-controls="verifyPanel" disabled>验签</button></div></div>
 					<dl class="meta-list"><div><dt>加密</dt><dd id="securityEncryption">未加密</dd></div><div id="securityMethodRow" hidden><dt>算法</dt><dd id="securityMethod"></dd></div></dl>

assets/webui/ofdgo.css

@@ -2161,6 +2161,19 @@ button.outline-link:hover {
 	text-decoration: underline;
 }
 
+.conversion-notice {
+	margin-block: 12px;
+}
+
+.conversion-notice > summary {
+	cursor: pointer;
+}
+
+.conversion-notice p {
+	margin-block: 8px;
+	overflow-wrap: anywhere;
+}
+
 .attachment-detail {
 	color: var(--text-muted);
 	font-size: 12px;

assets/webui/ofdgo.js

@@ -29,6 +29,7 @@ let credentialRequest = null;
 let cancelPageTouch = null;
 
 const state = {
+	conversionWarnings: [],
 	composite: null,
 	annotationEdit: null,
 	annotationCreate: null,
@@ -440,6 +441,8 @@ const el = {
 	refreshAppButton: document.querySelector("#refreshAppButton"),
 	metaFile: document.querySelector("#metaFile"),
 	metaTitle: document.querySelector("#metaTitle"),
+	conversionNotice: document.querySelector("#conversionNotice"),
+	conversionWarnings: document.querySelector("#conversionWarnings"),
 	metaSubject: document.querySelector("#metaSubject"),
 	metaAuthor: document.querySelector("#metaAuthor"),
 	metaCreationDate: document.querySelector("#metaCreationDate"),
@@ -1929,6 +1932,7 @@ async function toggleEditor() {
 		state.composite = null;
 		state.selectObjects = true;
 		state.ofdBytes = null;
+		state.conversionWarnings = [];
 		state.objectClipboard = null;
 		state.styleClipboard = null;
 		canvasEditor.clear();
@@ -3331,6 +3335,7 @@ async function openOFD(file) {
 	setBusy(true, "正在读取文档", 10, STATUS.opening);
 	try {
 		let bytes = new Uint8Array(await file.arrayBuffer());
+		let warnings = [];
 		if (openSeq !== state.openSeq) {
 			return;
 		}
@@ -3341,8 +3346,10 @@ async function openOFD(file) {
 			const converted = await callWASM("ofdgoConvertPDF", bytes);
 			if (openSeq !== state.openSeq) return;
 			bytes = converted.bytes;
+			warnings = JSON.parse(converted.warnings || "null") || [];
 		}
 		state.ofdBytes = bytes;
+		state.conversionWarnings = warnings;
 		state.fileName = (file.name || "ofdgo.ofd").replace(/\.pdf$/i, ".ofd");
 		state.editing = false;
 		state.composite = null;
@@ -6310,6 +6317,14 @@ function markThumbnailError(index) {
 
 function renderMeta(keepDetails = false) {
 	renderSecurity();
+	el.conversionNotice.hidden = !state.conversionWarnings.length;
+	renderMetaContent(el.conversionWarnings, state.conversionWarnings, () => {
+		el.conversionWarnings.replaceChildren(...state.conversionWarnings.map(warning => {
+			const item = document.createElement("p");
+			item.textContent = `第${warning.Page}页 · 位置${warning.Offset}：${warning.Message}`;
+			return item;
+		}));
+	});
 	const doc = state.doc || {};
 	el.metaPanel.setAttribute("aria-busy", String(!!doc.detailsPending));
 	document.title = `OFDGo WebUI - ${state.fileName}`;

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 v0.0.0-20260924080829-a19c3fd78f51
+	github.com/xiaoqidun/pdfgo v0.0.0-20260924091402-7973f8a3807a
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0

go.sum

@@ -60,8 +60,8 @@ 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 v0.0.0-20260924080829-a19c3fd78f51 h1:HOToanGdlILAjOAGQkH4XQDmGLwPoePBb3WSj3dSif4=
-github.com/xiaoqidun/pdfgo v0.0.0-20260924080829-a19c3fd78f51/go.mod h1:/D0XHgfZ7xNhix95swpNaThpuqoJjVR5wIadogtR5pI=
+github.com/xiaoqidun/pdfgo v0.0.0-20260924091402-7973f8a3807a h1:+mspTtduelAEpmCAw/Pc6p2azO1vkuF2wIJRDogZHU4=
+github.com/xiaoqidun/pdfgo v0.0.0-20260924091402-7973f8a3807a/go.mod h1:/D0XHgfZ7xNhix95swpNaThpuqoJjVR5wIadogtR5pI=
 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=

internal/webui/wasm.go

@@ -314,7 +314,7 @@ func safeCall(fn func([]js.Value) (any, error), args []js.Value) (data any, err
 
 // convertPDFDocument 通过库转换PDF，不替换当前文档会话
 // 入参: args PDF数据
-// 返回: any OFD数据, error 错误信息
+// 返回: any OFD数据及转换警告, error 错误信息
 func convertPDFDocument(args []js.Value) (any, error) {
 	if len(args) != 1 {
 		return nil, fmt.Errorf("missing PDF data")
@@ -324,11 +324,15 @@ func convertPDFDocument(args []js.Value) (any, error) {
 		return nil, err
 	}
 	var output bytes.Buffer
-	_, err = ofdgo.ConvertPDF(context.Background(), bytes.NewReader(data), int64(len(data)), &output, ofdgo.PDFImportOptions{})
+	report, err := ofdgo.ConvertPDF(context.Background(), bytes.NewReader(data), int64(len(data)), &output, ofdgo.PDFImportOptions{})
 	if err != nil {
 		return nil, err
 	}
-	return successResult(map[string]any{"bytes": bytesToJS(output.Bytes())}), nil
+	warnings, err := json.Marshal(report.Warnings)
+	if err != nil {
+		return nil, err
+	}
+	return successResult(map[string]any{"bytes": bytesToJS(output.Bytes()), "warnings": string(warnings)}), nil
 }
 
 // openDocument 打开OFD文档

ofdgo_pdf.go

@@ -25,18 +25,22 @@ import (
 	"github.com/xiaoqidun/pdfgo"
 )
 
-// PDFImportOptions 指定PDF转换的运行时后端与进度通知
+// PDFImportOptions 指定PDF转换的运行时后端、进度通知与源文件检查策略
+// Strict禁止恢复缺失的图形状态资源，默认恢复并在报告中记录警告
 type PDFImportOptions struct {
 	Backends *RenderBackends
 	Progress func(int) error
+	Strict   bool
 }
 
-// PDFImportReport 汇总成功转换的页面和可编辑对象
+// PDFImportReport 汇总转换页数、对象数、链接数和源文件恢复警告
 type PDFImportReport struct {
 	Pages        int
 	TextObjects  int
 	PathObjects  int
 	ImageObjects int
+	Links        int
+	Warnings     []pdfgo.Diagnostic
 }
 
 // pdfImporter 保存单次转换的对象与资源状态
@@ -50,6 +54,9 @@ type pdfImporter struct {
 	fontMetrics map[string]FontMetrics
 	cmykSpace   string
 	objects     []GraphicObject
+	pages       map[pdfgo.Reference]*pdfgo.Page
+	pageIDs     map[pdfgo.Reference]string
+	imageIDs    map[*pdfgo.Stream]string
 }
 
 // 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
@@ -67,15 +74,34 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 	if options.Backends != nil {
 		editor.SetRenderBackends(*options.Backends)
 	}
-	importer := pdfImporter{reader: reader, editor: editor, fontIDs: map[*pdfgo.Font]string{}, fontMetrics: map[string]FontMetrics{}}
+	importer := pdfImporter{reader: reader, editor: editor, fontIDs: map[*pdfgo.Font]string{}, fontMetrics: map[string]FontMetrics{}, pages: map[pdfgo.Reference]*pdfgo.Page{}, pageIDs: map[pdfgo.Reference]string{}}
 	err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
-		matrix, width, height := pdfPageMatrix(page)
-		importer.matrix = matrix
-		importer.page, err = editor.AddPage(width, height)
-		if err != nil {
+		_, width, height := pdfPageMatrix(page)
+		if _, err := editor.AddPage(width, height); err != nil {
 			return err
 		}
-		if err := reader.WalkPage(ctx, page, pdfgo.Visitor{Path: importer.path, Text: importer.text, Image: importer.image}); err != nil {
+		importer.pages[page.Reference] = page
+		importer.pageIDs[page.Reference] = editor.pages[index].ID
+		return nil
+	})
+	if err != nil {
+		return nil, PDFImportReport{}, err
+	}
+	err = reader.WalkPages(ctx, func(index int, page *pdfgo.Page) error {
+		matrix, _, _ := pdfPageMatrix(page)
+		importer.matrix = matrix
+		importer.page = index
+		visitor := pdfgo.Visitor{Path: importer.path, Text: importer.text, Image: importer.image}
+		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)
+		}
+		if err := importer.links(page); err != nil {
 			return fmt.Errorf("import PDF page %d: %w", index+1, err)
 		}
 		if _, err := editor.CopyObjects(importer.page, importer.objects, 0, 0); err != nil {
@@ -113,6 +139,8 @@ func ConvertPDF(ctx context.Context, source io.ReaderAt, size int64, output io.W
 }
 
 // pdfPageMatrix 将裁剪框、用户单位及页面旋转转换为OFD毫米坐标
+// 入参: page PDF页面
+// 返回: pdfgo.Matrix 坐标变换, float64 页面宽度, float64 页面高度
 func pdfPageMatrix(page *pdfgo.Page) (pdfgo.Matrix, float64, float64) {
 	b := page.CropBox
 	scale := 25.4 / 72 * page.UserUnit
@@ -132,6 +160,8 @@ func pdfPageMatrix(page *pdfgo.Page) (pdfgo.Matrix, float64, float64) {
 }
 
 // pdfNumbers 按OFD数值格式序列化坐标
+// 入参: values 数值列表
+// 返回: string 空格分隔的数值
 func pdfNumbers(values ...float64) string {
 	parts := make([]string, len(values))
 	for n, v := range values {
@@ -141,9 +171,13 @@ func pdfNumbers(values ...float64) string {
 }
 
 // pdfBoundary 序列化对象边界
+// 入参: b 对象边界
+// 返回: string OFD边界数据
 func pdfBoundary(b Box) string { return pdfNumbers(b.X, b.Y, b.W, b.H) }
 
 // pdfBounds 计算点集合的包围框
+// 入参: points 坐标点集合
+// 返回: Box 包围框
 func pdfBounds(points []pdfgo.Point) Box {
 	if len(points) == 0 {
 		return Box{}
@@ -159,6 +193,8 @@ func pdfBounds(points []pdfgo.Point) Box {
 }
 
 // color 保留设备色彩分量并复用文档颜色空间
+// 入参: paint PDF颜色与不透明度
+// 返回: *FillColor OFD颜色
 func (p *pdfImporter) color(paint pdfgo.Paint) *FillColor {
 	alpha := int(math.Round(paint.Alpha * 255))
 	if paint.CMYK != nil {
@@ -173,6 +209,8 @@ func (p *pdfImporter) color(paint pdfgo.Paint) *FillColor {
 }
 
 // pathData 将PDF路径转换为相对对象边界的OFD路径
+// 入参: path PDF路径, origin 对象边界
+// 返回: string OFD路径数据
 func (p *pdfImporter) pathData(path pdfgo.Path, origin Box) string {
 	var parts []string
 	for _, segment := range path.Segments {
@@ -186,6 +224,8 @@ func (p *pdfImporter) pathData(path pdfgo.Path, origin Box) string {
 }
 
 // clips 保持裁剪路径的交集，不随对象CTM重复变换
+// 入参: paths 裁剪路径, origin 对象边界
+// 返回: *Clips OFD裁剪区域，无裁剪时为空
 func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) *Clips {
 	if len(paths) == 0 {
 		return nil
@@ -210,7 +250,12 @@ func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) *Clips {
 }
 
 // path 添加独立可编辑路径
+// 入参: mark PDF路径绘制信息
+// 返回: error 错误信息
 func (p *pdfImporter) path(mark pdfgo.PathMark) error {
+	if mark.Fill && mark.Style.FillOverprint && !pdfOpaqueBlack(mark.Style.Fill) || mark.Stroke && mark.Style.StrokeOverprint && !pdfOpaqueBlack(mark.Style.Stroke) {
+		return &pdfgo.UnsupportedError{Feature: "color separation overprint"}
+	}
 	var points []pdfgo.Point
 	for _, segment := range mark.Path.Segments {
 		for _, point := range segment.Points {
@@ -244,3 +289,10 @@ func (p *pdfImporter) path(mark pdfgo.PathMark) error {
 	p.report.PathObjects++
 	return nil
 }
+
+// pdfOpaqueBlack 判断不受底层分色影响的全黑设备色
+// 入参: paint PDF颜色与不透明度
+// 返回: bool 是否为不透明全黑CMYK颜色
+func pdfOpaqueBlack(paint pdfgo.Paint) bool {
+	return paint.Alpha == 1 && paint.CMYK != nil && paint.CMYK[3] == 1
+}

ofdgo_pdf_link.go

@@ -0,0 +1,150 @@
+// 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"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// links 将无外观链接转换为OFD点击区域，其他注解或外观返回不支持错误
+// 入参: page PDF页面
+// 返回: error 错误信息
+func (p *pdfImporter) links(page *pdfgo.Page) error {
+	annotations, err := page.Annotations()
+	if err != nil {
+		return err
+	}
+	for _, annotation := range annotations {
+		dict := annotation.Dictionary
+		if annotation.Subtype != "Link" {
+			return &pdfgo.UnsupportedError{Feature: "annotation " + string(annotation.Subtype)}
+		}
+		for _, key := range []pdfgo.Name{"AP", "AA", "BS", "QuadPoints", "OC"} {
+			if dict[key] != nil {
+				return &pdfgo.UnsupportedError{Feature: fmt.Sprintf("link annotation field %q", key)}
+			}
+		}
+		if value, err := p.reader.Resolve(dict["F"]); err != nil {
+			return err
+		} else if value != nil {
+			flags, ok := value.(pdfgo.Integer)
+			if !ok {
+				return fmt.Errorf("invalid PDF annotation flags")
+			}
+			if flags != 0 && flags != 4 {
+				return &pdfgo.UnsupportedError{Feature: "link annotation flags"}
+			}
+		}
+		border, err := p.reader.Resolve(dict["Border"])
+		if err != nil {
+			return err
+		}
+		array, ok := border.(pdfgo.Array)
+		if !ok || len(array) != 3 || (array[2] != pdfgo.Integer(0) && array[2] != pdfgo.Real(0)) {
+			return &pdfgo.UnsupportedError{Feature: "visible link border"}
+		}
+		action := Action{Event: "CLICK"}
+		target := dict["Dest"]
+		if dict["A"] != nil {
+			value, err := p.reader.Resolve(dict["A"])
+			if err != nil {
+				return err
+			}
+			a, ok := value.(pdfgo.Dictionary)
+			if !ok {
+				return fmt.Errorf("invalid PDF link action")
+			}
+			if a["Next"] != nil {
+				return &pdfgo.UnsupportedError{Feature: "chained link actions"}
+			}
+			switch a["S"] {
+			case pdfgo.Name("GoTo"):
+				target = a["D"]
+			case pdfgo.Name("URI"):
+				value, err := p.reader.Resolve(a["URI"])
+				if err != nil {
+					return err
+				}
+				uri, ok := value.(pdfgo.String)
+				if !ok {
+					return fmt.Errorf("invalid PDF URI")
+				}
+				isMap, err := p.reader.Resolve(a["IsMap"])
+				if err != nil {
+					return err
+				}
+				if isMap != nil && isMap != pdfgo.Boolean(false) && isMap != pdfgo.Boolean(true) {
+					return fmt.Errorf("invalid PDF URI image map flag")
+				}
+				if isMap == pdfgo.Boolean(true) {
+					return &pdfgo.UnsupportedError{Feature: "URI image map"}
+				}
+				base, err := p.reader.BaseURI()
+				if err != nil {
+					return err
+				}
+				action.URI = &URI{URI: string(uri), Base: base}
+			default:
+				return &pdfgo.UnsupportedError{Feature: "link action"}
+			}
+		}
+		if action.URI == nil {
+			destination, err := p.reader.ReadDestination(target)
+			if err != nil {
+				return err
+			}
+			targetPage := p.pages[destination.Page]
+			if targetPage == nil {
+				return fmt.Errorf("PDF destination page missing")
+			}
+			matrix, _, _ := pdfPageMatrix(targetPage)
+			dest := &Dest{Type: string(destination.Mode), PageID: p.pageIDs[destination.Page]}
+			if destination.Mode == "XYZ" {
+				values := [3]float64{}
+				for n, v := range destination.Parameters {
+					switch v := v.(type) {
+					case pdfgo.Integer:
+						values[n] = float64(v)
+					case pdfgo.Real:
+						values[n] = float64(v)
+					case nil:
+						if n < 2 {
+							return &pdfgo.UnsupportedError{Feature: "retained destination coordinates"}
+						}
+					}
+				}
+				point := matrix.Apply(pdfgo.Point{X: values[0], Y: values[1]})
+				dest.Left, dest.Top, dest.Zoom = point.X, point.Y, values[2]
+			} else if destination.Mode != "Fit" {
+				return &pdfgo.UnsupportedError{Feature: "destination mode " + string(destination.Mode)}
+			}
+			action.Goto = &Goto{Dest: dest}
+		}
+		b := annotation.Rect
+		box := pdfBounds([]pdfgo.Point{p.matrix.Apply(pdfgo.Point{X: b.XMin, Y: b.YMin}), p.matrix.Apply(pdfgo.Point{X: b.XMax, Y: b.YMax})})
+		object, err := NewShape(ShapeRectangle, box)
+		if err != nil {
+			return err
+		}
+		no := false
+		object.Fill, object.Stroke = &no, &no
+		object.Actions = []Action{action}
+		p.objects = append(p.objects, GraphicObject{Type: "PathObject", PathObject: object})
+		p.report.Links++
+	}
+	return nil
+}

ofdgo_pdf_object.go

@@ -30,108 +30,64 @@ import (
 )
 
 // image 转换图像样本，不将整页或其他对象栅格化
+// 入参: mark PDF图像绘制信息
+// 返回: error 错误信息
 func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
+	if mark.Style.FillOverprint {
+		return &pdfgo.UnsupportedError{Feature: "image color separation overprint"}
+	}
 	source := mark.Image
-	filter, err := p.reader.Resolve(source.Stream.Dictionary["Filter"])
-	if err != nil {
-		return err
-	}
-	jpegOriginal := filter == pdfgo.Name("DCTDecode") && len(source.Decode) == 0 && !source.ImageMask && source.ColorSpace != pdfgo.Name("DeviceCMYK")
-	if source.Mask != nil || source.SoftMask != nil {
-		return &pdfgo.UnsupportedError{Feature: "image mask conversion"}
-	}
-	if !source.ImageMask && source.ColorSpace != pdfgo.Name("DeviceRGB") && source.ColorSpace != pdfgo.Name("DeviceGray") && source.ColorSpace != pdfgo.Name("DeviceCMYK") {
-		return &pdfgo.UnsupportedError{Feature: "image color management"}
-	}
-	if source.Stream.Dictionary["Intent"] != nil || source.Stream.Dictionary["SMaskInData"] != nil {
-		return &pdfgo.UnsupportedError{Feature: "image rendering attributes"}
-	}
-	decoded, err := source.DecodeSamples()
-	if err != nil {
-		return err
-	}
-	if len(source.Decode) > 0 {
-		components := 1
-		if source.ColorSpace == pdfgo.Name("DeviceRGB") {
-			components = 3
-		} else if source.ColorSpace == pdfgo.Name("DeviceCMYK") {
-			components = 4
-		}
-		if len(source.Decode) != components*2 {
-			return fmt.Errorf("invalid PDF image field %q", "Decode")
-		}
-		ranges := make([]float64, len(source.Decode))
-		for n, v := range source.Decode {
-			switch v := v.(type) {
-			case pdfgo.Integer:
-				ranges[n] = float64(v)
-			case pdfgo.Real:
-				ranges[n] = float64(v)
-			default:
-				return fmt.Errorf("invalid PDF image field %q", "Decode")
-			}
-		}
-		adjusted := image.NewNRGBA64(image.Rect(0, 0, source.Width, source.Height))
-		for y := 0; y < source.Height; y++ {
-			for x := 0; x < source.Width; x++ {
-				if components == 4 {
-					cmyk, ok := decoded.At(x, y).(color.CMYK)
-					if !ok {
-						return fmt.Errorf("invalid CMYK image samples")
-					}
-					values := []uint8{cmyk.C, cmyk.M, cmyk.Y, cmyk.K}
-					for c := range values {
-						value := ranges[2*c] + float64(values[c])/255*(ranges[2*c+1]-ranges[2*c])
-						values[c] = uint8(math.Round(math.Max(0, math.Min(1, value)) * 255))
-					}
-					adjusted.Set(x, y, color.CMYK{C: values[0], M: values[1], Y: values[2], K: values[3]})
-					continue
-				}
-				r, g, b, _ := decoded.At(x, y).RGBA()
-				values := []uint32{r, g, b}
-				for c := range values {
-					index := c
-					if components == 1 {
-						index = 0
-					}
-					value := ranges[2*index] + float64(values[c])/65535*(ranges[2*index+1]-ranges[2*index])
-					values[c] = uint32(math.Round(math.Max(0, math.Min(1, value)) * 65535))
-				}
-				adjusted.SetNRGBA64(x, y, color.NRGBA64{R: uint16(values[0]), G: uint16(values[1]), B: uint16(values[2]), A: 65535})
-			}
-		}
-		decoded = adjusted
-	}
+	id := p.imageIDs[source.Stream]
 	if source.ImageMask {
-		if mark.Style.Fill.CMYK != nil {
-			return &pdfgo.UnsupportedError{Feature: "CMYK stencil image"}
-		}
-		stencil := image.NewNRGBA64(image.Rect(0, 0, source.Width, source.Height))
-		fill := mark.Style.Fill.RGB
-		for y := 0; y < source.Height; y++ {
-			for x := 0; x < source.Width; x++ {
-				gray, _, _, _ := decoded.At(x, y).RGBA()
-				stencil.SetNRGBA64(x, y, color.NRGBA64{
-					R: uint16(math.Round(fill[0] * 65535)),
-					G: uint16(math.Round(fill[1] * 65535)),
-					B: uint16(math.Round(fill[2] * 65535)),
-					A: uint16(65535 - gray),
-				})
-			}
-		}
-		decoded = stencil
+		id = ""
 	}
-	var encoded bytes.Buffer
-	if jpegOriginal {
-		encoded.Write(source.Stream.Data)
-	} else {
-		if err := png.Encode(&encoded, decoded); err != nil {
+	if id == "" {
+		filter, err := p.reader.Resolve(source.Stream.Dictionary["Filter"])
+		if err != nil {
 			return err
 		}
-	}
-	id, err := p.editor.AddImage(encoded.Bytes())
-	if err != nil {
-		return err
+		jpegOriginal := filter == pdfgo.Name("DCTDecode") && len(source.Decode) == 0 && !source.ImageMask && source.ColorSpace != pdfgo.Name("DeviceCMYK") && source.Mask == nil && source.SoftMask == nil
+		decoded, err := source.DecodeImage()
+		if err != nil {
+			return err
+		}
+		if source.ImageMask {
+			if mark.Style.Fill.CMYK != nil {
+				return &pdfgo.UnsupportedError{Feature: "CMYK stencil image"}
+			}
+			stencil := image.NewNRGBA64(image.Rect(0, 0, source.Width, source.Height))
+			fill := mark.Style.Fill.RGB
+			for y := 0; y < source.Height; y++ {
+				for x := 0; x < source.Width; x++ {
+					gray, _, _, _ := decoded.At(x, y).RGBA()
+					stencil.SetNRGBA64(x, y, color.NRGBA64{
+						R: uint16(math.Round(fill[0] * 65535)),
+						G: uint16(math.Round(fill[1] * 65535)),
+						B: uint16(math.Round(fill[2] * 65535)),
+						A: uint16(65535 - gray),
+					})
+				}
+			}
+			decoded = stencil
+		}
+		var encoded bytes.Buffer
+		if jpegOriginal {
+			encoded.Write(source.Stream.Data)
+		} else {
+			if err := png.Encode(&encoded, decoded); err != nil {
+				return err
+			}
+		}
+		id, err = p.editor.AddImage(encoded.Bytes())
+		if err != nil {
+			return err
+		}
+		if !source.ImageMask {
+			if p.imageIDs == nil {
+				p.imageIDs = map[*pdfgo.Stream]string{}
+			}
+			p.imageIDs[source.Stream] = id
+		}
 	}
 	m := p.matrix.Mul(mark.Matrix).Mul(pdfgo.Matrix{1, 0, 0, -1, 0, 1})
 	box := pdfBounds([]pdfgo.Point{m.Apply(pdfgo.Point{}), m.Apply(pdfgo.Point{X: 1}), m.Apply(pdfgo.Point{Y: 1}), m.Apply(pdfgo.Point{X: 1, Y: 1})})
@@ -143,12 +99,17 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 }
 
 // text 保留原字体、字形编号与逐字基线，不重新塑形
+// 入参: mark PDF文字绘制信息
+// 返回: error 错误信息
 func (p *pdfImporter) text(mark pdfgo.TextMark) error {
+	if (mark.Mode == 0 || mark.Mode == 2) && mark.Style.FillOverprint && !pdfOpaqueBlack(mark.Style.Fill) || (mark.Mode == 1 || mark.Mode == 2) && mark.Style.StrokeOverprint && !pdfOpaqueBlack(mark.Style.Stroke) {
+		return &pdfgo.UnsupportedError{Feature: "text color separation overprint"}
+	}
 	font := mark.Font
 	if len(font.Program) == 0 {
 		return &pdfgo.UnsupportedError{Feature: "text without embedded font"}
 	}
-	if font.ProgramType != "FontFile2" && font.ProgramType != "OpenType" {
+	if font.ProgramType != "FontFile2" && font.ProgramType != "OpenType" && font.ProgramType != "Type1C" && font.ProgramType != "CIDFontType0C" {
 		return &pdfgo.UnsupportedError{Feature: "font program " + string(font.ProgramType)}
 	}
 	id := p.fontIDs[font]
@@ -187,6 +148,13 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	position := 0
 	for n, glyph := range mark.Glyphs {
 		gid := glyph.ID
+		if glyph.Text == "" && glyph.HasID {
+			character := getUnicodeFromName(glyph.Name)
+			if character == 0 {
+				character = packedGlyphRune(gid)
+			}
+			glyph.Text = string(character)
+		}
 		if !glyph.HasID {
 			if utf8.RuneCountInString(glyph.Text) != 1 {
 				return &pdfgo.UnsupportedError{Feature: "simple font glyph ligature mapping"}
@@ -242,9 +210,19 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	return nil
 }
 
-// pdfFontProgram 为PDF子集字体补齐封装表，不改动字形轮廓、编号或原始度量
+// pdfFontProgram 为PDF子集字体补齐封装表，保留字形轮廓和编号
+// 入参: source PDF字体
+// 返回: []byte 封装后的字体数据, error 错误信息
 func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
-	tables, err := fontFileTables(source.Program, 0)
+	program := source.Program
+	if source.ProgramType == "Type1C" || source.ProgramType == "CIDFontType0C" {
+		var err error
+		program, _, err = wrapCFFToOTF(source.Program)
+		if err != nil {
+			return nil, err
+		}
+	}
+	tables, err := fontFileTables(program, 0)
 	if err != nil {
 		return nil, err
 	}
@@ -310,7 +288,7 @@ func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
 		changed = true
 	}
 	if !changed {
-		return source.Program, nil
+		return program, nil
 	}
 	return serializeOTF(tables)
 }