feat(转换能力): 增强PDF字体与裁剪转换

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 v0.0.0-20260925114744-07854fb7628b
+	github.com/xiaoqidun/pdfgo v0.0.0-20260926005801-0f4b07fb311c
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0
@@ -26,6 +26,7 @@ require (
 	github.com/benoitkugler/textlayout v0.3.2 // indirect
 	github.com/benoitkugler/textprocessing v0.0.6 // indirect
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
+	github.com/mububoki/jpeg2000 v1.0.0 // indirect
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef // indirect
 	github.com/srwiley/scanx v0.0.0-20190309010443-e94503791388 // indirect
 	github.com/tdewolff/minify/v2 v2.24.17 // indirect

go.sum

@@ -38,6 +38,8 @@ github.com/go-text/typesetting-utils v0.0.0-20260419141703-4ffe8874dabc h1:8FGo2
 github.com/go-text/typesetting-utils v0.0.0-20260419141703-4ffe8874dabc/go.mod h1:3/62I4La/HBRX9TcTpBj4eipLiwzf+vhI+7whTc9V7o=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/mububoki/jpeg2000 v1.0.0 h1:1ha5mqCg0DMK6zbbBp9bkUjEds4HYwQqmU3ItF3k9qs=
+github.com/mububoki/jpeg2000 v1.0.0/go.mod h1:q+kfbMgsqawC9I10Zk+goSZ8+ac4cOzcWdIL1vpsDLs=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c h1:km8GpoQut05eY3GiYWEedbTT0qnSxrCjsVbb7yKY1KE=
@@ -60,8 +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 v0.0.0-20260925114744-07854fb7628b h1:4j0AxYMyWpmZLcISwFG4wbNbyRxfb8wDi+j9KlGLybQ=
-github.com/xiaoqidun/pdfgo v0.0.0-20260925114744-07854fb7628b/go.mod h1:/D0XHgfZ7xNhix95swpNaThpuqoJjVR5wIadogtR5pI=
+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/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=

ofdgo_editor.go

@@ -767,7 +767,7 @@ func (e *Editor) prepareObject(id string, object GraphicObject) (GraphicObject,
 	return cloneEditorObject(object)
 }
 
-// validateObjectClips 校验对象的路径裁剪，仅接受无资源引用及嵌套裁剪的路径
+// validateObjectClips 校验对象的路径与文字裁剪，拒绝嵌套裁剪和无效资源
 // 入参: clips 裁剪集合，nil表示无裁剪
 // 返回: error 错误信息
 func (e *Editor) validateObjectClips(clips *Clips) error {
@@ -782,8 +782,8 @@ func (e *Editor) validateObjectClips(clips *Clips) error {
 			return fmt.Errorf("clip must contain an area")
 		}
 		for _, area := range clip.Area {
-			if len(area.Path) == 0 || area.DrawParam != "" || len(area.Text) != 0 {
-				return fmt.Errorf("clips only support paths without draw parameter references")
+			if len(area.Path)+len(area.Text) == 0 || area.DrawParam != "" {
+				return fmt.Errorf("clip area requires paths or text without draw parameter references")
 			}
 			if area.CTM != "" {
 				if _, err := creationNumbers(area.CTM, 6); err != nil {
@@ -798,6 +798,14 @@ func (e *Editor) validateObjectClips(clips *Clips) error {
 					return err
 				}
 			}
+			for _, text := range area.Text {
+				if text.ID != "" || text.Clips != nil || text.Actions != nil {
+					return fmt.Errorf("clip text must not have object IDs, actions or nested clips")
+				}
+				if _, err := e.prepareObject("", GraphicObject{Type: "TextObject", TextObject: text}); err != nil {
+					return err
+				}
+			}
 		}
 	}
 	return nil

ofdgo_editor_color.go

@@ -302,23 +302,41 @@ func collectPaintReferences(paint *FillColor, used map[string]bool) {
 // collectObjectReferences 收集对象和嵌套绘制内容引用的资源
 // 入参: object 图形对象, used 引用集合
 func collectObjectReferences(object GraphicObject, used map[string]bool) {
+	var clips *Clips
 	switch object.Type {
-	case "TextObject":
+	case "TextObject", "Text":
 		used[object.TextObject.Font], used[object.TextObject.DrawParam] = true, true
 		collectPaintReferences(object.TextObject.FillColor, used)
 		collectPaintReferences((*FillColor)(object.TextObject.StrokeColor), used)
+		clips = object.TextObject.Clips
 	case "PathObject", "Path":
 		used[object.PathObject.DrawParam] = true
 		collectPaintReferences(object.PathObject.FillColor, used)
 		collectPaintReferences((*FillColor)(object.PathObject.StrokeColor), used)
+		clips = object.PathObject.Clips
 	case "ImageObject":
 		used[object.ImageObject.ResourceID], used[object.ImageObject.ImageMask] = true, true
 		if object.ImageObject.Border != nil {
 			collectPaintReferences((*FillColor)(object.ImageObject.Border.BorderColor), used)
 		}
+		clips = object.ImageObject.Clips
 	case "CompositeObject", "CompositeGraphicUnit":
 		collectCompositeReferences(object.CompositeGraphicUnit, used)
 	}
+	if clips == nil {
+		return
+	}
+	for _, clip := range clips.Clip {
+		for _, area := range clip.Area {
+			used[area.DrawParam] = true
+			for _, path := range area.Path {
+				collectObjectReferences(GraphicObject{Type: "Path", PathObject: path}, used)
+			}
+			for _, text := range area.Text {
+				collectObjectReferences(GraphicObject{Type: "Text", TextObject: text}, used)
+			}
+		}
+	}
 }
 
 // editorColor 校验当前文档的纯色和渐变

ofdgo_editor_composite.go

@@ -565,7 +565,7 @@ func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorComp
 				capability.ReasonCode, capability.Reason = editReason(err), err.Error()
 				errors.As(err, &capability.MissingGlyphs)
 			} else {
-				capability.TextContent = text.ReadDirection == 0 && text.CharDirection == 0
+				capability.TextContent = text.ReadDirection == 0 && text.CharDirection == 0 && (text.layout != nil || len(text.CGTransform) == 0)
 				if _, err := text.TextFrame(); err == nil {
 					capability.Reflow = capability.TextContent
 					capability.LayoutKnown = text.layout != nil

ofdgo_editor_open.go

@@ -555,6 +555,7 @@ func (e *Editor) objectCapabilities(object GraphicObject, orderable map[*editorX
 	}
 	if object.Type == "TextObject" {
 		all.TextContent = all.Update && object.TextObject.ReadDirection == 0 && object.TextObject.CharDirection == 0 && (all.LayoutKnown || len(object.TextObject.CGTransform) == 0)
+		all.Reflow = all.Reflow && (all.LayoutKnown || len(object.TextObject.CGTransform) == 0)
 		all.RewriteText = all.TextContent
 		if !all.RewriteText {
 			text := object.TextObject

ofdgo_editor_xml.go

@@ -238,8 +238,11 @@ func editorXMLAttributes(node *editorXML, allowed string) bool {
 func editorXMLSupported(node *editorXML) bool {
 	var allowed, children string
 	switch node.name.Local {
-	case "TextObject":
-		allowed, children = "ID Boundary CTM DrawParam Font Size HScale Weight ReadDirection CharDirection LineWidth MiterLimit Join Italic Visible Stroke Fill Alpha", "Clips FillColor StrokeColor TextCode"
+	case "TextObject", "Text":
+		allowed, children = "ID Boundary CTM DrawParam Font Size HScale Weight ReadDirection CharDirection LineWidth MiterLimit Join Italic Visible Stroke Fill Alpha", "Clips FillColor StrokeColor CGTransform TextCode"
+	case "CGTransform":
+		allowed, children = "CodePosition CodeCount GlyphCount", "Glyphs"
+	case "Glyphs":
 	case "PathObject", "Path":
 		allowed, children = "Boundary CTM LineWidth MiterLimit Join Cap Rule DashPattern DashOffset Visible Stroke Fill Alpha", "StrokeColor FillColor AbbreviatedData"
 		if node.name.Local == "PathObject" {
@@ -257,7 +260,7 @@ func editorXMLSupported(node *editorXML) bool {
 	case "Clip":
 		children = "Area"
 	case "Area":
-		allowed, children = "CTM", "Path"
+		allowed, children = "CTM", "Path Text"
 	case "AbbreviatedData":
 	default:
 		return false

ofdgo_font_cff.go

@@ -39,12 +39,13 @@ func wrapCFFToOTF(cffData []byte) ([]byte, map[rune]uint16, error) {
 	if err == nil {
 		cffData = sanitized
 	}
+	cffData, err = normalizeCFFDotsection(cffData)
+	if err != nil {
+		return nil, nil, err
+	}
 	widths, err := parseCFFWidths(cffData, numGlyphs)
 	if err != nil {
-		widths = make([]uint16, numGlyphs)
-		for i := range widths {
-			widths[i] = 500
-		}
+		return nil, nil, fmt.Errorf("CFF glyph widths: %w", err)
 	}
 	var unitsPerEm uint16 = 1000
 	if len(cffData) > 4 {
@@ -82,6 +83,144 @@ func wrapCFFToOTF(cffData []byte) ([]byte, map[rune]uint16, error) {
 // cffDict 使用float64存储所有数值，以统一处理整数和实数
 type cffDict map[int][]float64
 
+// normalizeCFFDotsection 移除旧版Type2字形程序中无效果的dotsection指令
+// 入参: data CFF字体数据
+// 返回: []byte 标准化后的CFF数据, error 错误信息
+func normalizeCFFDotsection(data []byte) ([]byte, error) {
+	if len(data) < 4 || int(data[2]) >= len(data) {
+		return nil, fmt.Errorf("invalid CFF header")
+	}
+	headerEnd := int(data[2])
+	_, nameSize := getCFFIndexCount(data, headerEnd)
+	topStart := headerEnd + nameSize
+	topData, topSize := getCFFIndexData(data, topStart)
+	if topData == nil || topStart+topSize > len(data) {
+		return nil, fmt.Errorf("invalid CFF top dictionary")
+	}
+	dict := parseCFFDict(topData)
+	charOffset := dict[17]
+	if len(charOffset) != 1 {
+		return nil, fmt.Errorf("missing CFF charstrings")
+	}
+	charStart := int(charOffset[0])
+	_, charSize := getCFFIndexCount(data, charStart)
+	if charStart < topStart+topSize || charSize == 0 || charStart+charSize > len(data) {
+		return nil, fmt.Errorf("invalid CFF charstrings")
+	}
+	if !bytes.Contains(data[charStart:charStart+charSize], []byte{12, 0}) {
+		return data, nil
+	}
+	chars := readCFFIndexItems(data, charStart)
+	changed := false
+	for index, charstring := range chars {
+		normalized, removed, err := stripType2Dotsection(charstring)
+		if err != nil {
+			return nil, err
+		}
+		chars[index] = normalized
+		changed = changed || removed
+	}
+	if !changed {
+		return data, nil
+	}
+	encodedChars := encodeCFFIndex(chars)
+	topEnd := topStart + topSize
+	newTop := encodeCFFIndex([][]byte{encodeCFFDict(dict)})
+	for range 6 {
+		shift := len(newTop) - topSize
+		shiftTail := shift + len(encodedChars) - charSize
+		for _, op := range []int{15, 16, 17, 1236, 1237} {
+			values := dict[op]
+			if len(values) != 1 || op == 15 && values[0] <= 2 || op == 16 && values[0] <= 1 {
+				continue
+			}
+			original := parseCFFDict(topData)[op]
+			offset := int(original[0])
+			if offset >= charStart+charSize {
+				dict[op] = []float64{float64(offset + shiftTail)}
+			} else if offset >= topEnd {
+				dict[op] = []float64{float64(offset + shift)}
+			}
+		}
+		if values := dict[18]; len(values) == 2 {
+			original := parseCFFDict(topData)[18]
+			offset := int(original[1])
+			if offset >= charStart+charSize {
+				dict[18] = []float64{values[0], float64(offset + shiftTail)}
+			}
+		}
+		updated := encodeCFFIndex([][]byte{encodeCFFDict(dict)})
+		if len(updated) == len(newTop) {
+			newTop = updated
+			break
+		}
+		newTop = updated
+	}
+	result := make([]byte, 0, len(data)+len(newTop)-topSize+len(encodedChars)-charSize)
+	result = append(result, data[:topStart]...)
+	result = append(result, newTop...)
+	result = append(result, data[topEnd:charStart]...)
+	result = append(result, encodedChars...)
+	result = append(result, data[charStart+charSize:]...)
+	return result, nil
+}
+
+// stripType2Dotsection 保留字形指令与掩码并移除无效果的旧指令
+// 入参: data Type2字形程序
+// 返回: []byte 标准化后的程序, bool 是否发生变更, error 错误信息
+func stripType2Dotsection(data []byte) ([]byte, bool, error) {
+	var result []byte
+	stack, hints := 0, 0
+	for index := 0; index < len(data); {
+		start := index
+		operator := int(data[index])
+		index++
+		switch {
+		case operator == 28:
+			index += 2
+			stack++
+		case operator == 255:
+			index += 4
+			stack++
+		case operator >= 247 && operator <= 254:
+			index++
+			stack++
+		case operator >= 32:
+			stack++
+		case operator == 12:
+			if index >= len(data) {
+				return nil, false, fmt.Errorf("incomplete Type2 operator")
+			}
+			operator = 1200 + int(data[index])
+			index++
+			if operator == 1200 {
+				if result == nil {
+					result = append(make([]byte, 0, len(data)-2), data[:start]...)
+				}
+				continue
+			}
+		default:
+			if operator == 1 || operator == 3 || operator == 18 || operator == 23 || operator == 19 || operator == 20 {
+				hints += stack / 2
+			}
+			if operator == 19 || operator == 20 {
+				index += (hints + 7) / 8
+			}
+			stack = 0
+		}
+		if index > len(data) {
+			return nil, false, fmt.Errorf("incomplete Type2 charstring")
+		}
+		if result != nil {
+			result = append(result, data[start:index]...)
+		}
+	}
+	if result == nil {
+		return data, false, nil
+	}
+	return result, true, nil
+}
+
 // sanitizeCFF 尝试清洗CFF数据，转换CID字体并合并FontMatrix
 // 入参: data 原始CFF数据
 // 返回: []byte 清洗后的CFF数据, error 错误信息
@@ -1501,6 +1640,26 @@ func getUnicodeFromName(name string) rune {
 		return '.'
 	case "slash":
 		return '/'
+	case "zero":
+		return '0'
+	case "one":
+		return '1'
+	case "two":
+		return '2'
+	case "three":
+		return '3'
+	case "four":
+		return '4'
+	case "five":
+		return '5'
+	case "six":
+		return '6'
+	case "seven":
+		return '7'
+	case "eight":
+		return '8'
+	case "nine":
+		return '9'
 	case "colon":
 		return ':'
 	case "semicolon":

ofdgo_font_type1.go

@@ -0,0 +1,737 @@
+// 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/binary"
+	"encoding/hex"
+	"fmt"
+	"math"
+	"strconv"
+)
+
+type type1Program struct {
+	glyphs []type1Glyph
+	subrs  [][]byte
+	lenIV  int
+}
+
+type type1Glyph struct {
+	name string
+	data []byte
+}
+
+type type1Scanner struct {
+	data []byte
+	pos  int
+}
+
+// parseType1Program 读取Type1字体的字形程序及子程序
+// 入参: data PFA或PFB字体数据
+// 返回: type1Program 字形和子程序, error 错误信息
+func parseType1Program(data []byte) (type1Program, error) {
+	var err error
+	data, err = flattenType1(data)
+	if err != nil {
+		return type1Program{}, err
+	}
+	marker := []byte("eexec")
+	start := bytes.Index(data, marker)
+	if start < 0 {
+		return type1Program{}, fmt.Errorf("Type1 font lacks eexec data")
+	}
+	start += len(marker)
+	for start < len(data) && type1Space(data[start]) {
+		start++
+	}
+	if start == len(data) {
+		return type1Program{}, fmt.Errorf("empty Type1 eexec data")
+	}
+	encrypted := data[start:]
+	if type1HexEncoded(encrypted) {
+		end := bytes.Index(encrypted, []byte("cleartomark"))
+		if end >= 0 {
+			encrypted = encrypted[:end]
+		}
+		digits := make([]byte, 0, len(encrypted))
+		for _, c := range encrypted {
+			if type1Space(c) {
+				continue
+			}
+			if !type1HexDigit(c) {
+				break
+			}
+			digits = append(digits, c)
+		}
+		encrypted = make([]byte, hex.DecodedLen(len(digits)))
+		if _, err := hex.Decode(encrypted, digits); err != nil {
+			return type1Program{}, fmt.Errorf("invalid Type1 eexec encoding: %w", err)
+		}
+	}
+	if len(encrypted) < 4 {
+		return type1Program{}, fmt.Errorf("invalid Type1 eexec data")
+	}
+	decrypted := type1Decrypt(encrypted, 55665)[4:]
+	scanner := type1Scanner{data: decrypted}
+	program := type1Program{lenIV: 4}
+	section := ""
+	for {
+		token := scanner.next()
+		if token == "" || token == "closefile" {
+			break
+		}
+		switch token {
+		case "/lenIV":
+			value, err := strconv.Atoi(scanner.next())
+			if err != nil || value < -1 {
+				return type1Program{}, fmt.Errorf("invalid Type1 lenIV")
+			}
+			program.lenIV = value
+		case "/Subrs":
+			section = "subrs"
+		case "/CharStrings":
+			section = "glyphs"
+		case "dup":
+			if section != "subrs" {
+				continue
+			}
+			index, err := strconv.Atoi(scanner.next())
+			if err != nil || index < 0 || index > len(decrypted) {
+				return type1Program{}, fmt.Errorf("invalid Type1 subroutine index")
+			}
+			length, err := strconv.Atoi(scanner.next())
+			if err != nil {
+				return type1Program{}, fmt.Errorf("invalid Type1 subroutine length")
+			}
+			if !type1BinaryStart(scanner.next()) {
+				return type1Program{}, fmt.Errorf("missing Type1 subroutine data")
+			}
+			raw, err := scanner.binary(length)
+			if err != nil {
+				return type1Program{}, err
+			}
+			for len(program.subrs) <= index {
+				program.subrs = append(program.subrs, nil)
+			}
+			program.subrs[index] = raw
+		default:
+			if section != "glyphs" || len(token) < 2 || token[0] != '/' {
+				continue
+			}
+			name := token[1:]
+			next := scanner.next()
+			length, err := strconv.Atoi(next)
+			if err != nil {
+				continue
+			}
+			if !type1BinaryStart(scanner.next()) {
+				return type1Program{}, fmt.Errorf("missing Type1 glyph data")
+			}
+			raw, err := scanner.binary(length)
+			if err != nil {
+				return type1Program{}, err
+			}
+			program.glyphs = append(program.glyphs, type1Glyph{name: name, data: raw})
+		}
+	}
+	if len(program.glyphs) == 0 {
+		return type1Program{}, fmt.Errorf("Type1 font has no glyphs")
+	}
+	for index := range program.subrs {
+		program.subrs[index], err = type1CharString(program.subrs[index], program.lenIV)
+		if err != nil {
+			return type1Program{}, err
+		}
+	}
+	for index := range program.glyphs {
+		program.glyphs[index].data, err = type1CharString(program.glyphs[index].data, program.lenIV)
+		if err != nil {
+			return type1Program{}, fmt.Errorf("Type1 glyph %s: %w", program.glyphs[index].name, err)
+		}
+	}
+	return program, nil
+}
+
+// flattenType1 将PFB分段容器转换为连续的Type1程序
+// 入参: data 字体数据
+// 返回: []byte 连续程序, error 错误信息
+func flattenType1(data []byte) ([]byte, error) {
+	if len(data) < 2 || data[0] != 0x80 {
+		return data, nil
+	}
+	var program []byte
+	for len(data) >= 2 && data[0] == 0x80 {
+		if data[1] == 3 {
+			return program, nil
+		}
+		if len(data) < 6 || data[1] != 1 && data[1] != 2 {
+			return nil, fmt.Errorf("invalid PFB segment")
+		}
+		length := binary.LittleEndian.Uint32(data[2:6])
+		if uint64(length) > uint64(len(data)-6) {
+			return nil, fmt.Errorf("truncated PFB segment")
+		}
+		program = append(program, data[6:6+length]...)
+		data = data[6+length:]
+	}
+	return nil, fmt.Errorf("missing PFB end marker")
+}
+
+// type1Decrypt 解密Type1的eexec或字形程序
+// 入参: data 密文, seed 初始密钥
+// 返回: []byte 明文
+func type1Decrypt(data []byte, seed uint16) []byte {
+	out := make([]byte, len(data))
+	for index, value := range data {
+		out[index] = value ^ byte(seed>>8)
+		seed = uint16((uint32(value)+uint32(seed))*52845 + 22719)
+	}
+	return out
+}
+
+// type1CharString 解密字形程序并移除lenIV随机前缀
+// 入参: data 字形密文, lenIV 前缀长度
+// 返回: []byte 指令数据, error 错误信息
+func type1CharString(data []byte, lenIV int) ([]byte, error) {
+	if lenIV < 0 {
+		return data, nil
+	}
+	if len(data) < lenIV {
+		return nil, fmt.Errorf("truncated Type1 charstring")
+	}
+	return type1Decrypt(data, 4330)[lenIV:], nil
+}
+
+// type1HexEncoded 区分eexec十六进制与二进制封装
+// 入参: data eexec数据
+// 返回: bool 是否为十六进制
+func type1HexEncoded(data []byte) bool {
+	count := 0
+	for _, value := range data {
+		if type1Space(value) {
+			continue
+		}
+		if !type1HexDigit(value) {
+			return false
+		}
+		count++
+		if count == 8 {
+			return true
+		}
+	}
+	return false
+}
+
+func type1HexDigit(value byte) bool {
+	return value >= '0' && value <= '9' || value >= 'a' && value <= 'f' || value >= 'A' && value <= 'F'
+}
+
+func type1Space(value byte) bool {
+	return value == ' ' || value == '\t' || value == '\r' || value == '\n' || value == '\f' || value == 0
+}
+
+// next 读取下一个PostScript词项，字形二进制块由binary处理
+// 返回: string 词项
+func (s *type1Scanner) next() string {
+	for s.pos < len(s.data) {
+		if type1Space(s.data[s.pos]) {
+			s.pos++
+			continue
+		}
+		if s.data[s.pos] == '%' {
+			for s.pos < len(s.data) && s.data[s.pos] != '\n' && s.data[s.pos] != '\r' {
+				s.pos++
+			}
+			continue
+		}
+		break
+	}
+	if s.pos == len(s.data) {
+		return ""
+	}
+	start := s.pos
+	if bytes.IndexByte([]byte("[]{}"), s.data[s.pos]) >= 0 {
+		s.pos++
+		return string(s.data[start:s.pos])
+	}
+	for s.pos < len(s.data) && !type1Space(s.data[s.pos]) && bytes.IndexByte([]byte("[]{}%"), s.data[s.pos]) < 0 {
+		s.pos++
+	}
+	return string(s.data[start:s.pos])
+}
+
+// binary 按PostScript长度读取RD后的加密字节
+// 入参: length 数据长度
+// 返回: []byte 二进制数据, error 错误信息
+func (s *type1Scanner) binary(length int) ([]byte, error) {
+	if s.pos >= len(s.data) || !type1Space(s.data[s.pos]) || length < 0 {
+		return nil, fmt.Errorf("invalid Type1 binary data")
+	}
+	if s.data[s.pos] == '\r' && s.pos+1 < len(s.data) && s.data[s.pos+1] == '\n' {
+		s.pos += 2
+	} else {
+		s.pos++
+	}
+	if length > len(s.data)-s.pos {
+		return nil, fmt.Errorf("truncated Type1 binary data")
+	}
+	data := s.data[s.pos : s.pos+length]
+	s.pos += length
+	return data, nil
+}
+
+func type1BinaryStart(token string) bool {
+	return token == "RD" || token == "-|"
+}
+
+type type1Outline struct {
+	program    *type1Program
+	args       []float64
+	postscript []float64
+	flexPoints [][2]float64
+	width      float64
+	x          float64
+	y          float64
+	pointX     float64
+	pointY     float64
+	open       bool
+	defined    bool
+	flex       bool
+	path       bytes.Buffer
+}
+
+// outline 将Type1字形指令转换为保留三次曲线的Type2程序
+// 入参: glyph 字形数据
+// 返回: []byte Type2字形程序, error 错误信息
+func (p *type1Program) outline(glyph type1Glyph) ([]byte, error) {
+	state := type1Outline{program: p}
+	ended, err := state.run(glyph.data, 0)
+	if err != nil {
+		return nil, fmt.Errorf("Type1 glyph %s: %w", glyph.name, err)
+	}
+	if !ended || !state.defined {
+		return nil, fmt.Errorf("Type1 glyph %s has no complete outline", glyph.name)
+	}
+	var result bytes.Buffer
+	if err := encodeType2Number(&result, state.width); err != nil {
+		return nil, err
+	}
+	result.Write(state.path.Bytes())
+	result.WriteByte(14)
+	return result.Bytes(), nil
+}
+
+// run 执行Type1字形或子程序，遇到endchar返回完成状态
+// 入参: data 指令数据, depth 子程序深度
+// 返回: bool 是否遇到endchar, error 错误信息
+func (s *type1Outline) run(data []byte, depth int) (bool, error) {
+	if depth > 32 {
+		return false, fmt.Errorf("Type1 subroutine recursion")
+	}
+	for index := 0; index < len(data); index++ {
+		op := int(data[index])
+		if op >= 32 {
+			var value float64
+			switch {
+			case op <= 246:
+				value = float64(op - 139)
+			case op <= 250:
+				if index+1 >= len(data) {
+					return false, fmt.Errorf("truncated Type1 operand")
+				}
+				index++
+				value = float64((op-247)*256 + int(data[index]) + 108)
+			case op <= 254:
+				if index+1 >= len(data) {
+					return false, fmt.Errorf("truncated Type1 operand")
+				}
+				index++
+				value = float64(-(op-251)*256 - int(data[index]) - 108)
+			default:
+				if index+4 >= len(data) {
+					return false, fmt.Errorf("truncated Type1 operand")
+				}
+				value = float64(int32(binary.BigEndian.Uint32(data[index+1 : index+5])))
+				index += 4
+			}
+			s.args = append(s.args, value)
+			continue
+		}
+		if op == 12 {
+			if index+1 >= len(data) {
+				return false, fmt.Errorf("truncated Type1 operator")
+			}
+			index++
+			op = 1200 + int(data[index])
+		}
+		if op == 10 {
+			if len(s.args) == 0 {
+				return false, fmt.Errorf("Type1 callsubr has no index")
+			}
+			index := int(s.args[len(s.args)-1])
+			s.args = s.args[:len(s.args)-1]
+			if 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)
+			if err != nil || ended {
+				return ended, err
+			}
+			continue
+		}
+		if op == 11 {
+			if depth == 0 {
+				return false, fmt.Errorf("Type1 return outside subroutine")
+			}
+			return false, nil
+		}
+		if op == 14 {
+			return true, nil
+		}
+		if err := s.operator(op); err != nil {
+			return false, err
+		}
+	}
+	return false, nil
+}
+
+// operator 执行单个Type1绘制指令并清空已消费的操作数
+// 入参: op 指令编号
+// 返回: error 错误信息
+func (s *type1Outline) operator(op int) error {
+	a := s.args
+	s.args = nil
+	switch op {
+	case 1, 3, 1200, 1201, 1202:
+		return nil
+	case 13:
+		if s.defined || len(a) != 2 {
+			return fmt.Errorf("invalid Type1 hsbw")
+		}
+		s.x, s.width, s.defined = a[0], a[1], true
+	case 1207:
+		if s.defined || len(a) != 4 || a[3] != 0 {
+			return fmt.Errorf("invalid Type1 sbw")
+		}
+		s.x, s.y, s.width, s.defined = a[0], a[1], a[2], true
+	case 4, 21, 22:
+		if !s.defined || op == 4 && len(a) != 1 || op == 21 && len(a) != 2 || op == 22 && len(a) != 1 {
+			return fmt.Errorf("invalid Type1 move")
+		}
+		if s.flex {
+			point := [2]float64{}
+			if op == 4 || op == 21 {
+				point[1] = a[len(a)-1]
+			}
+			if op == 21 || op == 22 {
+				point[0] = a[0]
+			}
+			s.flexPoints = append(s.flexPoints, point)
+			return nil
+		}
+		if op == 4 || op == 21 {
+			s.y += a[len(a)-1]
+		}
+		if op == 21 || op == 22 {
+			s.x += a[0]
+		}
+		return s.move()
+	case 5, 6, 7:
+		if !s.defined || op == 5 && (len(a) == 0 || len(a)%2 != 0) || op != 5 && len(a) == 0 {
+			return fmt.Errorf("invalid Type1 line")
+		}
+		if err := s.ensureMove(); err != nil {
+			return err
+		}
+		for n := 0; n < len(a); {
+			var dx, dy float64
+			switch op {
+			case 5:
+				dx, dy = a[n], a[n+1]
+				n += 2
+			case 6:
+				dx = a[n]
+				n++
+			case 7:
+				dy = a[n]
+				n++
+			}
+			if err := s.line(dx, dy); err != nil {
+				return err
+			}
+		}
+	case 8, 30, 31:
+		count := 6
+		if op != 8 {
+			count = 4
+		}
+		if !s.defined || len(a) == 0 || len(a)%count != 0 {
+			return fmt.Errorf("invalid Type1 curve")
+		}
+		if err := s.ensureMove(); err != nil {
+			return err
+		}
+		for n := 0; n < len(a); n += count {
+			var curve [6]float64
+			switch op {
+			case 8:
+				copy(curve[:], a[n:n+6])
+			case 30:
+				curve = [6]float64{0, a[n], a[n+1], a[n+2], a[n+3], 0}
+			case 31:
+				curve = [6]float64{a[n], 0, a[n+1], a[n+2], 0, a[n+3]}
+			}
+			if err := s.curve(curve); err != nil {
+				return err
+			}
+		}
+	case 9:
+		s.open = false
+	case 1212:
+		if len(a) != 2 || a[1] == 0 {
+			return fmt.Errorf("invalid Type1 division")
+		}
+		s.args = []float64{a[0] / 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 {
+			return fmt.Errorf("invalid Type1 callothersubr arguments")
+		}
+		switch number {
+		case 0:
+			if !s.flex || count != 3 || len(s.flexPoints) != 7 {
+				return fmt.Errorf("invalid Type1 Flex end")
+			}
+			if err := s.ensureMove(); err != nil {
+				return err
+			}
+			first := s.flexPoints
+			if err := s.curve([6]float64{first[0][0] + first[1][0], first[0][1] + first[1][1], first[2][0], first[2][1], first[3][0], first[3][1]}); err != nil {
+				return err
+			}
+			if err := s.curve([6]float64{first[4][0], first[4][1], first[5][0], first[5][1], first[6][0], first[6][1]}); err != nil {
+				return err
+			}
+			if s.x != a[1] || s.y != a[2] {
+				return fmt.Errorf("Type1 Flex endpoint differs from outline")
+			}
+			s.postscript = []float64{s.x, s.y}
+			s.flexPoints = nil
+			s.flex = false
+		case 1:
+			if count != 0 || s.flex {
+				return fmt.Errorf("invalid Type1 Flex start")
+			}
+			s.flex = true
+			s.flexPoints = nil
+		case 2:
+			if count != 0 || !s.flex {
+				return fmt.Errorf("invalid Type1 Flex point")
+			}
+		case 3:
+			if count != 1 {
+				return fmt.Errorf("invalid Type1 hint replacement")
+			}
+			s.postscript = []float64{a[0]}
+		default:
+			return fmt.Errorf("unsupported Type1 OtherSubr %d", number)
+		}
+	case 1217:
+		if len(s.postscript) == 0 {
+			return fmt.Errorf("invalid Type1 pop")
+		}
+		s.args = append(a, s.postscript[0])
+		s.postscript = s.postscript[1:]
+	case 1233:
+		if len(a) != 2 {
+			return fmt.Errorf("invalid Type1 setcurrentpoint")
+		}
+		s.x, s.y = a[0], a[1]
+	case 1206:
+		return fmt.Errorf("unsupported Type1 seac")
+	default:
+		return fmt.Errorf("unsupported Type1 operator %d", op)
+	}
+	return nil
+}
+
+// move 在Type2字形程序中建立新轮廓
+// 返回: error 错误信息
+func (s *type1Outline) move() error {
+	if err := encodeType2Number(&s.path, s.x-s.pointX); err != nil {
+		return err
+	}
+	if err := encodeType2Number(&s.path, s.y-s.pointY); err != nil {
+		return err
+	}
+	s.path.WriteByte(21)
+	s.pointX, s.pointY, s.open = s.x, s.y, true
+	return nil
+}
+
+// ensureMove 在首次描绘或关闭轮廓后建立当前位置
+// 返回: error 错误信息
+func (s *type1Outline) ensureMove() error {
+	if !s.open || s.x != s.pointX || s.y != s.pointY {
+		return s.move()
+	}
+	return nil
+}
+
+// line 保留Type1线段的实际终点
+// 入参: dx 横向增量, dy 纵向增量
+// 返回: error 错误信息
+func (s *type1Outline) line(dx, dy float64) error {
+	if err := encodeType2Number(&s.path, dx); err != nil {
+		return err
+	}
+	if err := encodeType2Number(&s.path, dy); err != nil {
+		return err
+	}
+	s.path.WriteByte(5)
+	s.x += dx
+	s.y += dy
+	s.pointX, s.pointY = s.x, s.y
+	return nil
+}
+
+// curve 保留Type1三次贝塞尔控制点
+// 入参: values 六个相对坐标
+// 返回: error 错误信息
+func (s *type1Outline) curve(values [6]float64) error {
+	for _, value := range values {
+		if err := encodeType2Number(&s.path, value); err != nil {
+			return err
+		}
+	}
+	s.path.WriteByte(8)
+	s.x += values[0] + values[2] + values[4]
+	s.y += values[1] + values[3] + values[5]
+	s.pointX, s.pointY = s.x, s.y
+	return nil
+}
+
+// encodeType2Number 编码Type2字形指令的有符号定点操作数
+// 入参: target 目标字节流, value 操作数
+// 返回: error 错误信息
+func encodeType2Number(target *bytes.Buffer, value float64) error {
+	if !finite(value) || value < -32768 || value >= 32768 {
+		return fmt.Errorf("Type2 operand out of range")
+	}
+	if value == math.Trunc(value) {
+		integer := int(value)
+		switch {
+		case integer >= -107 && integer <= 107:
+			target.WriteByte(byte(integer + 139))
+		case integer >= 108 && integer <= 1131:
+			integer -= 108
+			target.WriteByte(byte(247 + integer/256))
+			target.WriteByte(byte(integer % 256))
+		case integer <= -108 && integer >= -1131:
+			integer = -integer - 108
+			target.WriteByte(byte(251 + integer/256))
+			target.WriteByte(byte(integer % 256))
+		default:
+			target.WriteByte(28)
+			_ = binary.Write(target, binary.BigEndian, int16(integer))
+		}
+		return nil
+	}
+	target.WriteByte(255)
+	_ = binary.Write(target, binary.BigEndian, int32(math.Round(value*65536)))
+	return nil
+}
+
+// toCFF 将Type1字形转换为保持三次轮廓的CFF字体
+// 入参: name 字体名称
+// 返回: []byte CFF数据, error 错误信息
+func (p *type1Program) toCFF(name string) ([]byte, error) {
+	if len(p.glyphs) > math.MaxUint16 || name == "" {
+		return nil, fmt.Errorf("invalid Type1 font identity")
+	}
+	ordered := make([]type1Glyph, 0, len(p.glyphs))
+	for _, glyph := range p.glyphs {
+		if glyph.name == ".notdef" {
+			ordered = append(ordered, glyph)
+			break
+		}
+	}
+	if len(ordered) == 0 {
+		return nil, fmt.Errorf("Type1 font lacks .notdef glyph")
+	}
+	for _, glyph := range p.glyphs {
+		if glyph.name != ".notdef" {
+			ordered = append(ordered, glyph)
+		}
+	}
+	chars := make([][]byte, len(ordered))
+	strings := make([][]byte, 0, len(ordered)-1)
+	charset := make([]byte, 1+2*(len(ordered)-1))
+	for index, glyph := range ordered {
+		charstring, err := p.outline(glyph)
+		if err != nil {
+			return nil, err
+		}
+		chars[index] = charstring
+		if index == 0 {
+			continue
+		}
+		strings = append(strings, []byte(glyph.name))
+		sid := 391 + index - 1
+		if sid > math.MaxUint16 {
+			return nil, fmt.Errorf("Type1 font has too many glyph names")
+		}
+		binary.BigEndian.PutUint16(charset[1+(index-1)*2:], uint16(sid))
+	}
+	nameIndex := encodeCFFIndex([][]byte{[]byte(name)})
+	stringIndex := encodeCFFIndex(strings)
+	globalSubrs := encodeCFFIndex(nil)
+	charIndex := encodeCFFIndex(chars)
+	topDict := make([]byte, 12)
+	topDict[0], topDict[5], topDict[6], topDict[11] = 29, 15, 29, 17
+	topIndex := encodeCFFIndex([][]byte{topDict})
+	charsetOffset := 4 + len(nameIndex) + len(topIndex) + len(stringIndex) + len(globalSubrs)
+	charOffset := charsetOffset + len(charset)
+	binary.BigEndian.PutUint32(topDict[1:5], uint32(charsetOffset))
+	binary.BigEndian.PutUint32(topDict[7:11], uint32(charOffset))
+	topIndex = encodeCFFIndex([][]byte{topDict})
+	data := make([]byte, 0, charOffset+len(charIndex))
+	data = append(data, 1, 0, 4, 4)
+	data = append(data, nameIndex...)
+	data = append(data, topIndex...)
+	data = append(data, stringIndex...)
+	data = append(data, globalSubrs...)
+	data = append(data, charset...)
+	data = append(data, charIndex...)
+	return data, nil
+}
+
+// glyphIDs 返回Type1名称到转换后字形编号的对应关系
+// 返回: map[string]uint16 字形编号
+func (p *type1Program) glyphIDs() map[string]uint16 {
+	ids := map[string]uint16{".notdef": 0}
+	next := uint16(1)
+	for _, glyph := range p.glyphs {
+		if glyph.name != ".notdef" {
+			ids[glyph.name] = next
+			next++
+		}
+	}
+	return ids
+}

ofdgo_pdf.go

@@ -48,24 +48,27 @@ type PDFImportReport struct {
 
 // pdfImporter 保存单次转换的对象与资源状态
 type pdfImporter struct {
-	ctx         context.Context
-	reader      *pdfgo.Reader
-	editor      *Editor
-	report      PDFImportReport
-	matrix      pdfgo.Matrix
-	page        int
-	fontIDs     map[*pdfgo.Font]string
-	fontMetrics map[string]FontMetrics
-	cmykSpace   string
-	objects     []GraphicObject
-	pages       map[pdfgo.Reference]*pdfgo.Page
-	pageIDs     map[pdfgo.Reference]string
-	imageIDs    map[*pdfgo.Stream]string
-	maskClips   map[*pdfgo.SoftMask]pdfgo.Path
-	pageBox     pdfgo.Rectangle
-	pageWidth   float64
-	pageHeight  float64
-	pendingPath *pdfgo.PathMark
+	ctx             context.Context
+	reader          *pdfgo.Reader
+	editor          *Editor
+	report          PDFImportReport
+	matrix          pdfgo.Matrix
+	page            int
+	fontIDs         map[*pdfgo.Font]string
+	fontMetrics     map[string]FontMetrics
+	fontRepairLimit map[*pdfgo.Font]uint16
+	type1Glyphs     map[*pdfgo.Font]map[string]uint16
+	clipTexts       map[*pdfgo.TextClip]TextObject
+	cmykSpace       string
+	objects         []GraphicObject
+	pages           map[pdfgo.Reference]*pdfgo.Page
+	pageIDs         map[pdfgo.Reference]string
+	imageIDs        map[*pdfgo.Stream]string
+	maskClips       map[*pdfgo.SoftMask]pdfgo.Path
+	pageBox         pdfgo.Rectangle
+	pageWidth       float64
+	pageHeight      float64
+	pendingPath     *pdfgo.PathMark
 }
 
 // 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
@@ -122,6 +125,7 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		importer.pageWidth = width
 		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.Group = func(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
 			return importer.group(mark, walk, visitor)
@@ -293,28 +297,44 @@ 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 {
+// 返回: *Clips OFD裁剪区域，无裁剪时为空, error 未解析的裁剪字形
+func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) (*Clips, error) {
 	if len(paths) == 0 {
-		return nil
+		return nil, nil
 	}
 	flag := false
 	clips := &Clips{TransFlag: &flag}
 	for _, path := range paths {
+		area := ClipArea{}
 		var points []pdfgo.Point
 		for _, segment := range path.Segments {
 			for _, point := range segment.Points {
 				points = append(points, p.matrix.Apply(point))
 			}
 		}
-		box := pdfBounds(points)
-		rule := "NonZero"
-		if path.EvenOdd {
-			rule = "Even-Odd"
+		if len(path.Segments) != 0 {
+			box := pdfBounds(points)
+			rule := "NonZero"
+			if path.EvenOdd {
+				rule = "Even-Odd"
+			}
+			area.Path = append(area.Path, PathObject{Boundary: pdfBoundary(Box{box.X - origin.X, box.Y - origin.Y, box.W, box.H}), AbbreviatedData: p.pathData(path, box), Rule: rule})
 		}
-		clips.Clip = append(clips.Clip, Clip{Area: []ClipArea{{Path: []PathObject{{Boundary: pdfBoundary(Box{box.X - origin.X, box.Y - origin.Y, box.W, box.H}), AbbreviatedData: p.pathData(path, box), Rule: rule}}}}})
+		for _, mark := range path.Text {
+			object, ok := p.clipTexts[mark]
+			if !ok {
+				return nil, fmt.Errorf("missing PDF text clipping glyphs")
+			}
+			box, err := ParseBox(object.Boundary)
+			if err != nil {
+				return nil, err
+			}
+			object.Boundary = pdfBoundary(Box{box.X - origin.X, box.Y - origin.Y, box.W, box.H})
+			area.Text = append(area.Text, object)
+		}
+		clips.Clip = append(clips.Clip, Clip{Area: []ClipArea{area}})
 	}
-	return clips
+	return clips, nil
 }
 
 // path 合并相同状态下的不透明描边，保留独立子路径与绘制顺序
@@ -393,7 +413,11 @@ func (p *pdfImporter) appendPath(mark pdfgo.PathMark) error {
 		return err
 	}
 	strokeColor := StrokeColor(*strokePaint)
-	object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: p.pathData(mark.Path, box), Fill: &mark.Fill, Stroke: &mark.Stroke, FillColor: fillColor, StrokeColor: &strokeColor, LineWidth: mark.Style.LineWidth * scale, Cap: []string{"Butt", "Round", "Square"}[mark.Style.Cap], Join: []string{"Miter", "Round", "Bevel"}[mark.Style.Join], MiterLimit: mark.Style.MiterLimit, Clips: p.clips(mark.Style.Clips, box)}
+	clips, err := p.clips(mark.Style.Clips, box)
+	if err != nil {
+		return err
+	}
+	object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: p.pathData(mark.Path, box), Fill: &mark.Fill, Stroke: &mark.Stroke, FillColor: fillColor, StrokeColor: &strokeColor, LineWidth: mark.Style.LineWidth * scale, Cap: []string{"Butt", "Round", "Square"}[mark.Style.Cap], Join: []string{"Miter", "Round", "Bevel"}[mark.Style.Join], MiterLimit: mark.Style.MiterLimit, Clips: clips}
 	object.LineWidthSet = object.LineWidth == 0
 	if mark.Path.EvenOdd {
 		object.Rule = "Even-Odd"

ofdgo_pdf_group.go

@@ -148,7 +148,11 @@ func (p *pdfImporter) group(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error
 		}
 		region.paint.Alpha = mark.Alpha
 		fill, stroke := true, false
-		object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: data, Fill: &fill, Stroke: &stroke, FillColor: p.color(region.paint), Clips: p.clips(clips, box)}
+		objectClips, err := p.clips(clips, box)
+		if err != nil {
+			return err
+		}
+		object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: data, Fill: &fill, Stroke: &stroke, FillColor: p.color(region.paint), Clips: objectClips}
 		p.objects = append(p.objects, GraphicObject{Type: "PathObject", PathObject: object})
 		p.report.PathObjects++
 	}

ofdgo_pdf_object.go

@@ -75,20 +75,28 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 		}
 		if source.ImageMask {
 			fill := mark.Style.Fill.RGB
+			tint := color.NRGBA64{
+				R: uint16(math.Round(fill[0] * 65535)),
+				G: uint16(math.Round(fill[1] * 65535)),
+				B: uint16(math.Round(fill[2] * 65535)),
+			}
 			if mark.Style.Fill.CMYK != nil {
-				if *mark.Style.Fill.CMYK != [4]float64{} {
-					return &pdfgo.UnsupportedError{Feature: "CMYK stencil image"}
-				}
-				fill = [3]float64{1, 1, 1}
+				components := *mark.Style.Fill.CMYK
+				tint = color.NRGBA64Model.Convert(color.CMYK{
+					C: uint8(math.Round(components[0] * 255)),
+					M: uint8(math.Round(components[1] * 255)),
+					Y: uint8(math.Round(components[2] * 255)),
+					K: uint8(math.Round(components[3] * 255)),
+				}).(color.NRGBA64)
 			}
 			stencil := image.NewNRGBA64(image.Rect(0, 0, source.Width, source.Height))
 			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)),
+						R: tint.R,
+						G: tint.G,
+						B: tint.B,
 						A: uint16(65535 - gray),
 					})
 				}
@@ -119,7 +127,11 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 	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})})
 	alpha := int(math.Round(mark.Style.Fill.Alpha * 255))
-	object := ImageObject{Boundary: pdfBoundary(box), ResourceID: id, CTM: pdfNumbers(m[0], m[1], m[2], m[3], m[4]-box.X, m[5]-box.Y), Alpha: &alpha, Clips: p.clips(mark.Style.Clips, box)}
+	clips, err := p.clips(mark.Style.Clips, box)
+	if err != nil {
+		return err
+	}
+	object := ImageObject{Boundary: pdfBoundary(box), ResourceID: id, CTM: pdfNumbers(m[0], m[1], m[2], m[3], m[4]-box.X, m[5]-box.Y), Alpha: &alpha, Clips: clips}
 	p.objects = append(p.objects, GraphicObject{Type: "ImageObject", ImageObject: object})
 	p.report.ImageObjects++
 	return nil
@@ -130,6 +142,9 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 // 返回: error 错误信息
 func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	if mark.Font.Subtype == pdfgo.Name("Type3") {
+		if mark.Clip != nil {
+			return &pdfgo.UnsupportedError{Feature: "Type3 text clipping"}
+		}
 		if err := p.flushPath(); err != nil {
 			return err
 		}
@@ -155,23 +170,44 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	if err != nil {
 		return err
 	}
-	if (mark.Mode == 0 || mark.Mode == 2) && mark.Style.FillOverprint && pdfOverprintNeedsSeparation(mark.Style.Fill) || (mark.Mode == 1 || mark.Mode == 2) && mark.Style.StrokeOverprint && pdfOverprintNeedsSeparation(mark.Style.Stroke) {
+	paintMode := mark.Mode % 4
+	if (paintMode == 0 || paintMode == 2) && mark.Style.FillOverprint && pdfOverprintNeedsSeparation(mark.Style.Fill) || (paintMode == 1 || paintMode == 2) && mark.Style.StrokeOverprint && pdfOverprintNeedsSeparation(mark.Style.Stroke) {
 		return &pdfgo.UnsupportedError{Feature: "text color separation overprint"}
 	}
 	font := mark.Font
 	embedded := len(font.Program) != 0
-	if embedded && font.ProgramType != "FontFile2" && font.ProgramType != "OpenType" && font.ProgramType != "Type1C" && font.ProgramType != "CIDFontType0C" {
+	if embedded && font.ProgramType != "FontFile" && 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]
 	if id == "" {
 		var err error
 		if embedded {
+			var type1 *type1Program
+			if font.ProgramType == "FontFile" {
+				parsed, err := parseType1Program(font.Program)
+				if err != nil {
+					return fmt.Errorf("PDF font %s program: %w", font.Name, err)
+				}
+				type1 = &parsed
+				if p.type1Glyphs == nil {
+					p.type1Glyphs = make(map[*pdfgo.Font]map[string]uint16)
+				}
+				p.type1Glyphs[font] = parsed.glyphIDs()
+			}
 			var program []byte
-			program, err = pdfFontProgram(font)
+			var limit uint16
+			program, limit, err = pdfFontProgram(font, type1)
 			if err != nil {
 				return fmt.Errorf("PDF font %s program: %w", font.Name, err)
 			}
+			if limit != 0 {
+				if p.fontRepairLimit == nil {
+					p.fontRepairLimit = make(map[*pdfgo.Font]uint16)
+				}
+				p.fontRepairLimit[font] = limit
+				p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF embedded font lacks trailing side bearings; unused metrics reconstructed from glyph bounds"})
+			}
 			id, err = p.editor.AddFont(FontFile{Name: font.Name + ".ttf", Data: program}, 0)
 		} else {
 			id, err = p.editor.AddExternalFont(font.Name)
@@ -181,6 +217,13 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 		}
 		p.fontIDs[font] = id
 	}
+	if limit := p.fontRepairLimit[font]; limit != 0 {
+		for _, glyph := range mark.Glyphs {
+			if glyph.HasID && glyph.ID >= limit {
+				return &pdfgo.UnsupportedError{Feature: "embedded font glyph with missing side bearing"}
+			}
+		}
+	}
 	var metrics FontMetrics
 	var outline FontOutlines
 	if embedded {
@@ -208,6 +251,14 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	position := 0
 	for n, glyph := range mark.Glyphs {
 		gid := glyph.ID
+		if embedded && font.ProgramType == "FontFile" {
+			var found bool
+			gid, found = p.type1Glyphs[font][glyph.Name]
+			if !found {
+				return fmt.Errorf("missing Type1 glyph %q in PDF font %s", glyph.Name, font.Name)
+			}
+			glyph.HasID = true
+		}
 		if glyph.Text == "" && glyph.HasID {
 			character := getUnicodeFromName(glyph.Name)
 			if character == 0 {
@@ -256,7 +307,7 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 		}
 	}
 	box := pdfBounds(points)
-	fill, stroke, visible := mark.Mode == 0 || mark.Mode == 2, mark.Mode == 1 || mark.Mode == 2, mark.Mode != 3
+	fill, stroke, visible := paintMode == 0 || paintMode == 2, paintMode == 1 || paintMode == 2, paintMode != 3
 	if stroke {
 		scale := math.Sqrt(math.Abs(m[0]*m[3] - m[1]*m[2]))
 		if scale == 0 || math.IsNaN(scale) || math.IsInf(scale, 0) {
@@ -292,44 +343,81 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 	if err != nil {
 		return err
 	}
-	object.Clips = p.clips(mark.Style.Clips, box)
+	object.Clips, err = p.clips(mark.Style.Clips, box)
+	if err != nil {
+		return err
+	}
+	if mark.Clip != nil {
+		clipObject := object
+		clipObject.Clips = nil
+		clipObject.Fill, clipObject.Stroke = new(bool), new(bool)
+		*clipObject.Fill = true
+		*clipObject.Stroke = false
+		clipObject.Visible = nil
+		p.clipTexts[mark.Clip] = clipObject
+	}
 	p.objects = append(p.objects, GraphicObject{Type: "TextObject", TextObject: object})
 	p.report.TextObjects++
 	return nil
 }
 
 // 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) {
+// 入参: source PDF字体, type1 已解析的Type1程序，nil时按需解析
+// 返回: []byte 封装后的字体数据, uint16 缺失度量前的完整字形数, error 错误信息
+func pdfFontProgram(source *pdfgo.Font, type1 *type1Program) ([]byte, uint16, error) {
 	program := source.Program
+	if source.ProgramType == "FontFile" {
+		if type1 == nil {
+			parsed, err := parseType1Program(program)
+			if err != nil {
+				return nil, 0, err
+			}
+			type1 = &parsed
+		}
+		var err error
+		program, err = type1.toCFF(source.Name)
+		if err != nil {
+			return nil, 0, err
+		}
+	}
 	bareCFF := len(program) >= 4 && program[0] == 1 && program[1] == 0 && program[2] >= 4 && program[3] >= 1 && program[3] <= 4
 	if source.ProgramType == "Type1C" || source.ProgramType == "CIDFontType0C" || bareCFF {
 		var err error
-		program, _, err = wrapCFFToOTF(source.Program)
+		program, _, err = wrapCFFToOTF(program)
 		if err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 	}
 	tables, err := fontFileTables(program, 0)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 	if len(tables["head"]) < 54 || len(tables["maxp"]) < 6 || len(tables["hhea"]) < 36 || len(tables["hmtx"]) == 0 {
-		return nil, fmt.Errorf("embedded PDF font lacks required metrics")
+		return nil, 0, fmt.Errorf("embedded PDF font lacks required metrics")
 	}
 	count := binary.BigEndian.Uint16(tables["maxp"][4:6])
 	if count == 0 {
-		return nil, fmt.Errorf("embedded PDF font has no glyphs")
+		return nil, 0, fmt.Errorf("embedded PDF font has no glyphs")
 	}
 	changed := false
+	var repairedLimit uint16
 	metrics := int(binary.BigEndian.Uint16(tables["hhea"][34:36]))
 	if metrics == 0 || metrics > int(count) {
-		return nil, fmt.Errorf("invalid embedded PDF font metric count")
+		return nil, 0, fmt.Errorf("invalid embedded PDF font metric count")
 	}
 	metricLength := 4*metrics + 2*(int(count)-metrics)
 	if len(tables["hmtx"]) < metricLength {
-		return nil, fmt.Errorf("incomplete embedded PDF font metrics")
+		if len(tables["hmtx"]) < 4*metrics || len(tables["hmtx"])%2 != 0 {
+			return nil, 0, fmt.Errorf("incomplete embedded PDF font metrics: have %d, need %d", len(tables["hmtx"]), metricLength)
+		}
+		limit := metrics + (len(tables["hmtx"])-4*metrics)/2
+		missing, err := pdfMissingLeftBearings(tables, limit, int(count))
+		if err != nil {
+			return nil, 0, err
+		}
+		tables["hmtx"] = append(bytes.Clone(tables["hmtx"]), missing...)
+		repairedLimit = uint16(limit)
+		changed = true
 	}
 	if len(tables["hmtx"]) > metricLength {
 		tables["hmtx"] = tables["hmtx"][:metricLength]
@@ -340,10 +428,10 @@ func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
 		for code := range source.Unicode {
 			glyphs, err := source.Decode([]byte(code))
 			if err != nil {
-				return nil, err
+				return nil, 0, err
 			}
 			if len(glyphs) != 1 || !glyphs[0].HasID {
-				return nil, &pdfgo.UnsupportedError{Feature: "font without explicit glyph mapping"}
+				return nil, 0, &pdfgo.UnsupportedError{Feature: "font without explicit glyph mapping"}
 			}
 			glyph := glyphs[0]
 			if utf8.RuneCountInString(glyph.Text) == 1 {
@@ -360,7 +448,7 @@ func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
 	if len(fontNamesFromTable(tables["name"])) == 0 {
 		name := utf16.Encode([]rune(source.Name))
 		if len(name) == 0 || len(name) > 32767 {
-			return nil, fmt.Errorf("PDF font name missing or excessive")
+			return nil, 0, fmt.Errorf("PDF font name missing or excessive")
 		}
 		data := make([]byte, 42+len(name)*2)
 		binary.BigEndian.PutUint16(data[2:], 3)
@@ -394,8 +482,72 @@ func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
 			changed = true
 		}
 	}
-	if !changed && len(program)%4 == 0 {
-		return program, nil
+	if !changed && !pdfSFNTMissingPadding(program) {
+		return program, repairedLimit, nil
 	}
-	return serializeOTF(tables)
+	result, err := serializeOTF(tables)
+	return result, repairedLimit, err
+}
+
+// pdfSFNTMissingPadding 判断字体表目录是否引用了未写入的末尾对齐字节
+// 入参: program OpenType字体数据
+// 返回: bool 是否需要重新封装
+func pdfSFNTMissingPadding(program []byte) bool {
+	if len(program) < 12 {
+		return true
+	}
+	count := int(binary.BigEndian.Uint16(program[4:6]))
+	if count > (len(program)-12)/16 {
+		return true
+	}
+	for index := range count {
+		record := program[12+16*index:]
+		offset := int(binary.BigEndian.Uint32(record[8:12]))
+		length := int(binary.BigEndian.Uint32(record[12:16]))
+		if offset > len(program) || length > len(program)-offset || (4-length%4)%4 > len(program)-offset-length {
+			return true
+		}
+	}
+	return false
+}
+
+// pdfMissingLeftBearings 从轮廓边界恢复缺失的尾部左侧边距
+// 入参: tables 字体表, start 首个缺失字形, count 字形总数
+// 返回: []byte 补齐的hmtx数据, error 无法读取轮廓
+func pdfMissingLeftBearings(tables map[string][]byte, start, count int) ([]byte, error) {
+	head, loca, glyf := tables["head"], tables["loca"], tables["glyf"]
+	if len(head) < 54 || len(glyf) == 0 {
+		return nil, fmt.Errorf("embedded PDF font lacks glyph outlines for missing metrics")
+	}
+	format := int(int16(binary.BigEndian.Uint16(head[50:52])))
+	entrySize := 2
+	if format == 1 {
+		entrySize = 4
+	} else if format != 0 {
+		return nil, fmt.Errorf("invalid embedded PDF font location format")
+	}
+	if len(loca) < (count+1)*entrySize {
+		return nil, fmt.Errorf("incomplete embedded PDF font glyph locations")
+	}
+	location := func(index int) int {
+		if format == 0 {
+			return int(binary.BigEndian.Uint16(loca[index*2:])) * 2
+		}
+		return int(binary.BigEndian.Uint32(loca[index*4:]))
+	}
+	result := make([]byte, 2*(count-start))
+	for index := start; index < count; index++ {
+		from, to := location(index), location(index+1)
+		if from > to || to > len(glyf) {
+			return nil, fmt.Errorf("invalid embedded PDF font glyph location")
+		}
+		if from == to {
+			continue
+		}
+		if to-from < 10 {
+			return nil, fmt.Errorf("incomplete embedded PDF font glyph outline")
+		}
+		copy(result[(index-start)*2:], glyf[from+2:from+4])
+	}
+	return result, nil
 }

ofdgo_writer.go

@@ -656,7 +656,7 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 		attrs.add("xmlns:ofd", ofdNamespace)
 	}
 	switch object.Type {
-	case "TextObject":
+	case "TextObject", "Text":
 		obj := object.TextObject
 		attrs.add("ID", obj.ID)
 		attrs.add("DrawParam", obj.DrawParam)
@@ -746,7 +746,7 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 		x.color("StrokeColor", stroke)
 		x.color("FillColor", fill)
 		x.text("AbbreviatedData", object.PathObject.AbbreviatedData)
-	} else if object.Type == "TextObject" {
+	} else if object.Type == "TextObject" || object.Type == "Text" {
 		x.clips(object.TextObject.Clips)
 		x.color("FillColor", fill)
 		x.color("StrokeColor", stroke)
@@ -777,7 +777,7 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 	x.end(object.Type)
 }
 
-// clips 写出对象路径裁剪，保留裁剪集合、区域及路径的变换
+// clips 写出对象裁剪，保留区域内的路径与文字
 // 入参: clips 裁剪集合，nil不输出节点
 func (x *ofdXML) clips(clips *Clips) {
 	if clips == nil {
@@ -796,6 +796,9 @@ func (x *ofdXML) clips(clips *Clips) {
 			for _, path := range area.Path {
 				x.object(GraphicObject{Type: "Path", PathObject: path}, false)
 			}
+			for _, text := range area.Text {
+				x.object(GraphicObject{Type: "Text", TextObject: text}, false)
+			}
 			x.end("Area")
 		}
 		x.end("Clip")