feat(转换能力): 完善可编辑矢量转换与零线宽保存

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 v0.0.0-20260924091402-7973f8a3807a
+	github.com/xiaoqidun/pdfgo v0.0.0-20260924110344-e481bdea25e9
 	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 v0.0.0-20260924091402-7973f8a3807a h1:+mspTtduelAEpmCAw/Pc6p2azO1vkuF2wIJRDogZHU4=
-github.com/xiaoqidun/pdfgo v0.0.0-20260924091402-7973f8a3807a/go.mod h1:/D0XHgfZ7xNhix95swpNaThpuqoJjVR5wIadogtR5pI=
+github.com/xiaoqidun/pdfgo v0.0.0-20260924110344-e481bdea25e9 h1:MjDKg9lMG/5AmEr+SV7C2y4dzfhpfXDSYScfu2mZixQ=
+github.com/xiaoqidun/pdfgo v0.0.0-20260924110344-e481bdea25e9/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

@@ -3445,12 +3445,13 @@ func setPathStyle(object *ofdgo.PathObject, args []js.Value) error {
 	}
 	if !args[4].IsNull() {
 		width := args[4].Float()
-		if width <= 0 || math.IsNaN(width) || math.IsInf(width, 0) {
-			return fmt.Errorf("line width must be positive and finite")
+		if width < 0 || math.IsNaN(width) || math.IsInf(width, 0) {
+			return fmt.Errorf("line width must be nonnegative and finite")
 		}
 		if scale := editorPathScale(*object); width != object.LineWidth*scale {
 			object.LineWidth = width / scale
 		}
+		object.LineWidthSet = width == 0
 	}
 	if !args[1].IsNull() {
 		if object.FillColor == nil {

ofdgo_drawparam.go

@@ -58,8 +58,9 @@ func (r *Renderer) drawParamDefaults(id string, defaults *DrawParam) *DrawParam
 // 入参: base 基础绘制参数, dp 覆盖绘制参数
 // 返回: *DrawParam 合并后的绘制参数
 func mergeDrawParam(base DrawParam, dp *DrawParam) *DrawParam {
-	if dp.LineWidth > 0 {
+	if dp.LineWidth > 0 || dp.LineWidthSet {
 		base.LineWidth = dp.LineWidth
+		base.LineWidthSet = dp.LineWidthSet
 	}
 	if dp.Join != "" {
 		base.Join = dp.Join

ofdgo_editor.go

@@ -886,7 +886,7 @@ func transformEditorObject(object GraphicObject, dx, dy, scale float64) (Graphic
 				layout.options.FirstLineIndent *= scale
 				obj.layout = &layout
 			}
-			if obj.LineWidth == 0 && obj.Stroke != nil && *obj.Stroke {
+			if obj.LineWidth == 0 && !obj.LineWidthSet && obj.Stroke != nil && *obj.Stroke {
 				obj.LineWidth = defaultPathLineWidth
 			}
 			obj.LineWidth *= scale

ofdgo_editor_batch.go

@@ -565,14 +565,7 @@ func (e *Editor) TransformObjects(page int, ids []string, dx, dy, scale float64)
 				return GraphicObject{}, err
 			}
 		}
-		after, err := e.transformObject(object, dx, dy, scale)
-		if err != nil {
-			return GraphicObject{}, err
-		}
-		if origin := e.objectOrigin(editorObjectID(object)); origin != nil && origin.node.attr("LineWidth") == "0" && object.Type == "TextObject" && object.TextObject.LineWidth == 0 {
-			after.TextObject.LineWidth = 0
-		}
-		return after, nil
+		return e.transformObject(object, dx, dy, scale)
 	})
 }
 

ofdgo_editor_composite.go

@@ -610,7 +610,7 @@ func (e *Editor) compositeMemberStyle(node *editorCompositeNode) (GraphicObject,
 		base = &DrawParam{}
 	}
 	object, err := e.resolveEditorStyleDefaults(node.object, base)
-	if err == nil && object.Type == "PathObject" && object.PathObject.LineWidth == 0 {
+	if err == nil && object.Type == "PathObject" && object.PathObject.LineWidth == 0 && !object.PathObject.LineWidthSet {
 		object.PathObject.LineWidth = defaultPathLineWidth
 	}
 	return object, err

ofdgo_editor_composite_insert.go

@@ -263,6 +263,9 @@ func (e *Editor) addEditorDrawParam(draw DrawParam) (string, error) {
 			attrs.add(pair[0], pair[1])
 		}
 		attrs.number("LineWidth", draw.LineWidth)
+		if draw.LineWidthSet && draw.LineWidth == 0 {
+			attrs.add("LineWidth", "0")
+		}
 		attrs.number("MiterLimit", draw.MiterLimit)
 		if draw.Relative == "" || draw.dashPatternSet || draw.DashPattern != "" {
 			attrs = append(attrs, xml.Attr{Name: xml.Name{Local: "DashPattern"}, Value: draw.DashPattern})

ofdgo_editor_open.go

@@ -610,10 +610,12 @@ func editorPreservedObject(before, after GraphicObject) bool {
 		a, b := &before.TextObject, after.TextObject
 		a.ID, a.Boundary, a.CTM, a.Alpha = b.ID, b.Boundary, b.CTM, b.Alpha
 		a.Fill, a.Stroke, a.FillColor, a.StrokeColor, a.LineWidth = b.Fill, b.Stroke, b.FillColor, b.StrokeColor, b.LineWidth
+		a.LineWidthSet = b.LineWidthSet
 	case "PathObject":
 		a, b := &before.PathObject, after.PathObject
 		a.ID, a.Boundary, a.CTM, a.Alpha = b.ID, b.Boundary, b.CTM, b.Alpha
 		a.Fill, a.Stroke, a.FillColor, a.StrokeColor, a.LineWidth = b.Fill, b.Stroke, b.FillColor, b.StrokeColor, b.LineWidth
+		a.LineWidthSet = b.LineWidthSet
 		a.DashOffset, a.DashPattern, a.Cap, a.Join = b.DashOffset, b.DashPattern, b.Cap, b.Join
 		a.dashPatternSet = b.dashPatternSet
 	case "ImageObject":

ofdgo_editor_style.go

@@ -285,11 +285,12 @@ func (e *Editor) resolveEditorStyleDefaults(object GraphicObject, base *DrawPara
 	style := mergeDrawParam(*base, dp)
 	if object.Type == "PathObject" {
 		obj := &object.PathObject
-		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, Join: obj.Join, Cap: obj.Cap,
+		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, LineWidthSet: obj.LineWidthSet, Join: obj.Join, Cap: obj.Cap,
 			MiterLimit: obj.MiterLimit, DashPattern: obj.DashPattern, dashPatternSet: obj.dashPatternSet, DashOffset: obj.DashOffset,
 			FillColor: obj.FillColor, StrokeColor: obj.StrokeColor})
 		obj.DrawParam = ""
 		obj.LineWidth, obj.Join, obj.Cap = style.LineWidth, style.Join, style.Cap
+		obj.LineWidthSet = style.LineWidthSet
 		obj.MiterLimit, obj.DashPattern, obj.DashOffset = style.MiterLimit, style.DashPattern, style.DashOffset
 		obj.dashPatternSet = style.dashPatternSet
 		obj.FillColor, obj.StrokeColor = style.FillColor, style.StrokeColor
@@ -298,12 +299,13 @@ func (e *Editor) resolveEditorStyleDefaults(object GraphicObject, base *DrawPara
 		if style.Cap != "" && style.Cap != "Butt" || style.DashPattern != "" || style.DashOffset != nil && *style.DashOffset != 0 {
 			return GraphicObject{}, &EditError{Code: EditUnsupportedStyle, Err: fmt.Errorf("text draw parameters require unsupported stroke styles")}
 		}
-		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, Join: obj.Join,
+		style = mergeDrawParam(*style, &DrawParam{LineWidth: obj.LineWidth, LineWidthSet: obj.LineWidthSet, Join: obj.Join,
 			MiterLimit: obj.MiterLimit, FillColor: obj.FillColor, StrokeColor: obj.StrokeColor})
 		text := mergeDrawParam(*dp, &DrawParam{Font: obj.Font, Size: obj.Size, Weight: obj.Weight, Italic: obj.Italic})
 		obj.DrawParam = ""
 		obj.Font, obj.Size, obj.Weight, obj.Italic = text.Font, text.Size, text.Weight, text.Italic
 		obj.LineWidth, obj.Join, obj.MiterLimit = style.LineWidth, style.Join, style.MiterLimit
+		obj.LineWidthSet = style.LineWidthSet
 		obj.FillColor, obj.StrokeColor = style.FillColor, style.StrokeColor
 	}
 	for _, color := range []*FillColor{style.FillColor, (*FillColor)(style.StrokeColor)} {
@@ -396,10 +398,11 @@ func (e *Editor) styleObject(object GraphicObject, style ObjectStyle) (GraphicOb
 			path.StrokeColor = (*StrokeColor)(editorStyleColor((*FillColor)(style.StrokeColor), (*FillColor)(path.StrokeColor)))
 		}
 		if style.LineWidth != nil {
-			if !finite(*style.LineWidth) || *style.LineWidth <= 0 {
-				return GraphicObject{}, fmt.Errorf("line width must be positive")
+			if !finite(*style.LineWidth) || *style.LineWidth < 0 {
+				return GraphicObject{}, fmt.Errorf("line width must be nonnegative")
 			}
 			path.LineWidth = *style.LineWidth
+			path.LineWidthSet = path.LineWidth == 0
 		}
 		if style.DashPattern != nil {
 			path.DashPattern = *style.DashPattern
@@ -547,8 +550,9 @@ func copyEditorPathStyle(to, from PathObject, scale float64) PathObject {
 	to.Fill, to.Stroke, to.Alpha = from.Fill, from.Stroke, from.Alpha
 	to.FillColor, to.StrokeColor = from.FillColor, from.StrokeColor
 	to.LineWidth, to.Cap, to.Join, to.MiterLimit = from.LineWidth, from.Cap, from.Join, from.MiterLimit
+	to.LineWidthSet = from.LineWidthSet
 	to.DashPattern, to.DashOffset, to.dashPatternSet = from.DashPattern, from.DashOffset, true
-	if to.LineWidth == 0 {
+	if to.LineWidth == 0 && !to.LineWidthSet {
 		to.LineWidth = defaultPathLineWidth
 	}
 	if to.Cap == "" {

ofdgo_object.go

@@ -35,7 +35,7 @@ func (o GraphicObject) Actions() []Action {
 	return nil
 }
 
-// UnmarshalXML 解析路径并区分省略的虚线样式与显式实线
+// UnmarshalXML 解析路径并区分省略样式、显式实线与零线宽
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (p *PathObject) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
@@ -48,6 +48,11 @@ func (p *PathObject) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error
 		return err
 	}
 	*p = PathObject(value.plain)
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "LineWidth" {
+			p.LineWidthSet = p.LineWidth == 0
+		}
+	}
 	if value.DashPattern != nil {
 		p.DashPattern = *value.DashPattern
 		p.dashPatternSet = p.DashPattern == ""
@@ -55,7 +60,7 @@ func (p *PathObject) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error
 	return nil
 }
 
-// UnmarshalXML 解析绘制参数并保留显式实线对基础参数的覆盖
+// UnmarshalXML 解析绘制参数并保留显式实线和零线宽对基础参数的覆盖
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息
 func (p *DrawParam) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
@@ -68,6 +73,11 @@ func (p *DrawParam) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
 		return err
 	}
 	*p = DrawParam(value.plain)
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "LineWidth" {
+			p.LineWidthSet = p.LineWidth == 0
+		}
+	}
 	if value.DashPattern != nil {
 		p.DashPattern = *value.DashPattern
 		p.dashPatternSet = p.DashPattern == ""

ofdgo_page.go

@@ -109,7 +109,8 @@ type TextObject struct {
 	TextCode      []TextCode    `xml:"TextCode"`
 	Clips         *Clips        `xml:"Clips"`
 	Actions       []Action      `xml:"Actions>Action"`
-	layout        *textLayout
+	LineWidthSet bool `xml:"-"`
+	layout       *textLayout
 }
 
 // FillColor 填充颜色
@@ -166,15 +167,14 @@ type CGTransform struct {
 
 // PathObject 路径对象
 type PathObject struct {
-	ID              string   `xml:"ID,attr"`
-	Boundary        string   `xml:"Boundary,attr"`
-	DrawParam       string   `xml:"DrawParam,attr"`
-	LineWidth       float64  `xml:"LineWidth,attr"`
-	Join            string   `xml:"Join,attr"`
-	Cap             string   `xml:"Cap,attr"`
-	DashOffset      *float64 `xml:"DashOffset,attr"`
-	DashPattern     string   `xml:"DashPattern,attr"`
-	dashPatternSet  bool
+	ID              string       `xml:"ID,attr"`
+	Boundary        string       `xml:"Boundary,attr"`
+	DrawParam       string       `xml:"DrawParam,attr"`
+	LineWidth       float64      `xml:"LineWidth,attr"`
+	Join            string       `xml:"Join,attr"`
+	Cap             string       `xml:"Cap,attr"`
+	DashOffset      *float64     `xml:"DashOffset,attr"`
+	DashPattern     string       `xml:"DashPattern,attr"`
 	MiterLimit      float64      `xml:"MiterLimit,attr"`
 	CTM             string       `xml:"CTM,attr"`
 	Alpha           *int         `xml:"Alpha,attr"`
@@ -187,6 +187,8 @@ type PathObject struct {
 	AbbreviatedData string       `xml:"AbbreviatedData"`
 	Clips           *Clips       `xml:"Clips"`
 	Actions         []Action     `xml:"Actions>Action"`
+	LineWidthSet   bool `xml:"-"`
+	dashPatternSet bool
 }
 
 // StrokeColor 勾边颜色

ofdgo_pdf.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"io"
 	"math"
+	"reflect"
 	"strconv"
 	"strings"
 
@@ -57,6 +58,9 @@ type pdfImporter struct {
 	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
+	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
@@ -91,7 +95,12 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		matrix, _, _ := pdfPageMatrix(page)
 		importer.matrix = matrix
 		importer.page = index
+		importer.pageBox = page.CropBox
+		importer.maskClips = make(map[*pdfgo.SoftMask]pdfgo.Path)
 		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)
+		}
 		if !options.Strict {
 			visitor.Warning = func(warning pdfgo.Diagnostic) {
 				warning.Page = index + 1
@@ -101,6 +110,9 @@ func ImportPDF(ctx context.Context, source io.ReaderAt, size int64, options PDFI
 		if err := reader.WalkPage(ctx, page, visitor); err != nil {
 			return fmt.Errorf("import PDF page %d: %w", index+1, err)
 		}
+		if err := importer.flushPath(); 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)
 		}
@@ -249,10 +261,52 @@ func (p *pdfImporter) clips(paths []pdfgo.Path, origin Box) *Clips {
 	return clips
 }
 
-// path 添加独立可编辑路径
+// 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
 // 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.Stroke || mark.Fill || mark.Style.Stroke.Alpha != 1 {
+		if err := p.flushPath(); err != nil {
+			return err
+		}
+		return p.appendPath(mark)
+	}
+	if p.pendingPath != nil && !reflect.DeepEqual(p.pendingPath.Style, mark.Style) {
+		if err := p.flushPath(); err != nil {
+			return err
+		}
+	}
+	if p.pendingPath == nil {
+		p.pendingPath = &mark
+	} else {
+		p.pendingPath.Path.Segments = append(p.pendingPath.Path.Segments, mark.Path.Segments...)
+	}
+	if len(p.pendingPath.Path.Segments) >= 512 {
+		return p.flushPath()
+	}
+	return nil
+}
+
+// flushPath 写入连续描边批次，保持后续图元的叠放位置
+// 返回: error 转换错误
+func (p *pdfImporter) flushPath() error {
+	if p.pendingPath == nil {
+		return nil
+	}
+	mark := *p.pendingPath
+	p.pendingPath = nil
+	return p.appendPath(mark)
+}
+
+// appendPath 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) appendPath(mark pdfgo.PathMark) error {
+	var err error
+	mark.Style, err = p.maskStyle(mark.Style)
+	if err != nil {
+		return err
+	}
 	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"}
 	}
@@ -271,8 +325,9 @@ func (p *pdfImporter) path(mark pdfgo.PathMark) error {
 		margin := mark.Style.LineWidth * scale / 2 * math.Max(1, mark.Style.MiterLimit)
 		box = Box{box.X - margin, box.Y - margin, box.W + 2*margin, box.H + 2*margin}
 	}
-	strokeColor := StrokeColor(*p.color(mark.Style.Stroke))
-	object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: p.pathData(mark.Path, box), Fill: &mark.Fill, Stroke: &mark.Stroke, FillColor: p.color(mark.Style.Fill), 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)}
+	strokeColor := StrokeColor(*p.pathColor(mark.Style.Stroke, box))
+	object := PathObject{Boundary: pdfBoundary(box), AbbreviatedData: p.pathData(mark.Path, box), Fill: &mark.Fill, Stroke: &mark.Stroke, FillColor: p.pathColor(mark.Style.Fill, box), 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)}
+	object.LineWidthSet = object.LineWidth == 0
 	if mark.Path.EvenOdd {
 		object.Rule = "Even-Odd"
 	}
@@ -290,6 +345,32 @@ func (p *pdfImporter) path(mark pdfgo.PathMark) error {
 	return nil
 }
 
+// pathColor 将页面渐变轴转换为对象局部坐标
+// 入参: paint PDF画刷, box 对象边界
+// 返回: *FillColor OFD颜色或渐变
+func (p *pdfImporter) pathColor(paint pdfgo.Paint, box Box) *FillColor {
+	color := p.color(paint)
+	if paint.Axial == nil {
+		return color
+	}
+	gradient := paint.Axial
+	start, end := p.matrix.Apply(gradient.Start), p.matrix.Apply(gradient.End)
+	extend := 0
+	if gradient.Extend[0] {
+		extend |= 1
+	}
+	if gradient.Extend[1] {
+		extend |= 2
+	}
+	shading := &AxialShd{StartPoint: pdfNumbers(start.X-box.X, start.Y-box.Y), EndPoint: pdfNumbers(end.X-box.X, end.Y-box.Y), Extend: strconv.Itoa(extend)}
+	for _, stop := range gradient.Stops {
+		shading.Segment = append(shading.Segment, ShdSegment{Position: stop.Position, Color: ShdColor{Value: pdfNumbers(math.Round(stop.RGB[0]*255), math.Round(stop.RGB[1]*255), math.Round(stop.RGB[2]*255))}})
+	}
+	color.Value = ""
+	color.AxialShd = shading
+	return color
+}
+
 // 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

ofdgo_pdf_group.go

@@ -0,0 +1,316 @@
+// 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"
+	"math"
+	"reflect"
+
+	"github.com/xiaoqidun/pdfgo"
+)
+
+// group 将不透明图元的透明组转换为互不重叠的填充区域，保留矢量与组不透明度
+// 入参: mark 组边界状态, walk 组内容访问函数, visitor 页面访问器
+// 返回: error 不支持的组内容或转换错误
+func (p *pdfImporter) group(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error, visitor pdfgo.Visitor) error {
+	if err := p.flushPath(); err != nil {
+		return err
+	}
+	if mark.SoftMask != nil {
+		clip, err := p.maskClip(mark.SoftMask)
+		if err != nil {
+			return err
+		}
+		original := walk
+		walk = func(v pdfgo.Visitor) error {
+			return original(pdfClippedVisitor(v, clip))
+		}
+	}
+	if mark.Alpha == 1 {
+		if err := walk(visitor); err != nil {
+			return err
+		}
+		return p.flushPath()
+	}
+	geometry, err := p.editor.Geometry()
+	if err != nil {
+		return err
+	}
+	type paintRegion struct {
+		paint pdfgo.Paint
+		path  GeometryPath
+	}
+	var regions []paintRegion
+	var combined GeometryPath
+	var paint *pdfgo.Paint
+	var clips []pdfgo.Path
+	scale := math.Hypot(p.matrix[0], p.matrix[1])
+	collect := pdfgo.Visitor{Warning: visitor.Warning}
+	collect.Path = func(path pdfgo.PathMark) error {
+		shape, err := ParseGeometryPath(p.pathData(path.Path, Box{}))
+		if err != nil {
+			return err
+		}
+		for _, stroke := range []bool{false, true} {
+			if stroke && !path.Stroke || !stroke && !path.Fill {
+				continue
+			}
+			color, overprint := path.Style.Fill, path.Style.FillOverprint
+			if stroke {
+				color, overprint = path.Style.Stroke, path.Style.StrokeOverprint
+			}
+			if color.Alpha != 1 || color.Axial != nil || overprint && !pdfOpaqueBlack(color) {
+				return &pdfgo.UnsupportedError{Feature: "transparent or overprinted group content"}
+			}
+			if paint == nil {
+				paint, clips = &color, path.Style.Clips
+			} else if !reflect.DeepEqual(clips, path.Style.Clips) {
+				return &pdfgo.UnsupportedError{Feature: "independently clipped transparent group"}
+			} else if !reflect.DeepEqual(*paint, color) {
+				regions = append(regions, paintRegion{*paint, combined})
+				combined = nil
+				paint = &color
+			}
+			outline := shape
+			evenOdd := path.Path.EvenOdd
+			if stroke {
+				dashes := make([]float64, len(path.Style.Dash))
+				for i, dash := range path.Style.Dash {
+					dashes[i] = dash * scale
+				}
+				outline, err = geometry.Stroke(shape, StrokeOptions{Width: path.Style.LineWidth * scale, Cap: []string{"Butt", "Round", "Square"}[path.Style.Cap], Join: []string{"Miter", "Round", "Bevel"}[path.Style.Join], MiterLimit: path.Style.MiterLimit, DashOffset: path.Style.DashPhase * scale, Dashes: dashes, Tolerance: 0.001})
+				if err != nil {
+					return err
+				}
+				evenOdd = false
+			}
+			outline, err = geometry.Normalize(outline, evenOdd)
+			if err != nil {
+				return err
+			}
+			combined = append(combined, outline...)
+		}
+		return nil
+	}
+	if err := walk(collect); err != nil {
+		return err
+	}
+	if len(combined) == 0 {
+		return nil
+	}
+	regions = append(regions, paintRegion{*paint, combined})
+	var covered GeometryPath
+	for i := len(regions) - 1; i >= 0; i-- {
+		region := regions[i]
+		visible := region.path
+		if len(covered) > 0 {
+			visible, err = geometry.Combine(visible, covered, GeometrySubtract)
+			if err != nil {
+				return err
+			}
+		}
+		if i > 0 {
+			covered, err = geometry.Combine(covered, region.path, GeometryUnion)
+			if err != nil {
+				return err
+			}
+		}
+		if len(visible) == 0 {
+			continue
+		}
+		box, err := geometry.Bounds(visible)
+		if err != nil {
+			return err
+		}
+		if box.W == 0 || box.H == 0 {
+			continue
+		}
+		visible, err = geometry.Transform(visible, TranslationMatrix(-box.X, -box.Y))
+		if err != nil {
+			return err
+		}
+		data, err := visible.OFD()
+		if err != nil {
+			return err
+		}
+		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)}
+		p.objects = append(p.objects, GraphicObject{Type: "PathObject", PathObject: object})
+		p.report.PathObjects++
+	}
+	return nil
+}
+
+// pdfClippedVisitor 为图元及嵌套组附加裁剪，保留未提供的访问能力
+// 入参: visitor 图元访问器, clip 页面坐标裁剪
+// 返回: pdfgo.Visitor 裁剪访问器
+func pdfClippedVisitor(visitor pdfgo.Visitor, clip pdfgo.Path) pdfgo.Visitor {
+	result := visitor
+	if visitor.Path != nil {
+		result.Path = func(mark pdfgo.PathMark) error {
+			mark.Style.Clips = append(append([]pdfgo.Path(nil), mark.Style.Clips...), clip)
+			return visitor.Path(mark)
+		}
+	}
+	if visitor.Text != nil {
+		result.Text = func(mark pdfgo.TextMark) error {
+			mark.Style.Clips = append(append([]pdfgo.Path(nil), mark.Style.Clips...), clip)
+			return visitor.Text(mark)
+		}
+	}
+	if visitor.Image != nil {
+		result.Image = func(mark pdfgo.ImageMark) error {
+			mark.Style.Clips = append(append([]pdfgo.Path(nil), mark.Style.Clips...), clip)
+			return visitor.Image(mark)
+		}
+	}
+	if visitor.Group != nil {
+		result.Group = func(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
+			return visitor.Group(mark, func(v pdfgo.Visitor) error { return walk(pdfClippedVisitor(v, clip)) })
+		}
+	}
+	return result
+}
+
+// maskClip 将二值亮度蒙版转换为标准矢量裁剪，不栅格化原图元
+// 入参: mask PDF蒙版
+// 返回: pdfgo.Path 页面坐标裁剪路径, error 不可精确转换或几何错误
+func (p *pdfImporter) maskClip(mask *pdfgo.SoftMask) (pdfgo.Path, error) {
+	if clip, ok := p.maskClips[mask]; ok {
+		return clip, nil
+	}
+	geometry, err := p.editor.Geometry()
+	if err != nil {
+		return pdfgo.Path{}, err
+	}
+	opacity := func(v float64) (bool, error) {
+		v = math.Max(0, math.Min(1, mask.Transfer[0]+v*(mask.Transfer[1]-mask.Transfer[0])))
+		if v != 0 && v != 1 {
+			return false, &pdfgo.UnsupportedError{Feature: "nonbinary luminosity mask"}
+		}
+		return v == 1, nil
+	}
+	background, err := opacity(mask.Background)
+	if err != nil {
+		return pdfgo.Path{}, err
+	}
+	box := p.pageBox
+	var region GeometryPath
+	if background {
+		region, err = ParseGeometryPath(pdfNumbersPathBox(box))
+		if err != nil {
+			return pdfgo.Path{}, err
+		}
+		region, err = geometry.Normalize(region, false)
+		if err != nil {
+			return pdfgo.Path{}, err
+		}
+	}
+	identity := pdfImporter{matrix: pdfgo.Identity()}
+	var visitor pdfgo.Visitor
+	visitor.Group = func(mark pdfgo.GroupMark, walk func(pdfgo.Visitor) error) error {
+		if mark.Alpha != 1 || mark.SoftMask != nil {
+			return &pdfgo.UnsupportedError{Feature: "transparent mask group"}
+		}
+		return walk(visitor)
+	}
+	visitor.Path = func(mark pdfgo.PathMark) error {
+		paint := mark.Style.Fill
+		if !mark.Fill || mark.Stroke || paint.Alpha != 1 || paint.CMYK != nil || paint.Axial != nil || paint.RGB[0] != paint.RGB[1] || paint.RGB[1] != paint.RGB[2] || mark.Style.SoftMask != nil {
+			return &pdfgo.UnsupportedError{Feature: "nonbinary mask graphic"}
+		}
+		visible, err := opacity(paint.RGB[0])
+		if err != nil {
+			return err
+		}
+		shape, err := ParseGeometryPath(identity.pathData(mark.Path, Box{}))
+		if err != nil {
+			return err
+		}
+		shape, err = geometry.Normalize(shape, mark.Path.EvenOdd)
+		if err != nil {
+			return err
+		}
+		for _, clip := range mark.Style.Clips {
+			c, err := ParseGeometryPath(identity.pathData(clip, Box{}))
+			if err != nil {
+				return err
+			}
+			c, err = geometry.Normalize(c, clip.EvenOdd)
+			if err != nil {
+				return err
+			}
+			shape, err = geometry.Combine(shape, c, GeometryIntersect)
+			if err != nil {
+				return err
+			}
+		}
+		operation := GeometrySubtract
+		if visible {
+			operation = GeometryUnion
+		}
+		region, err = geometry.Combine(region, shape, operation)
+		return err
+	}
+	if err := mask.Walk(visitor); err != nil {
+		return pdfgo.Path{}, err
+	}
+	path := pdfgo.Path{}
+	for _, segment := range region {
+		point := func(p Point) pdfgo.Point { return pdfgo.Point{X: p.X, Y: p.Y} }
+		switch segment.Verb {
+		case GeometryMove:
+			path.Segments = append(path.Segments, pdfgo.Segment{Operator: "M", Points: []pdfgo.Point{point(segment.End)}})
+		case GeometryLine:
+			path.Segments = append(path.Segments, pdfgo.Segment{Operator: "L", Points: []pdfgo.Point{point(segment.End)}})
+		case GeometryCubic:
+			path.Segments = append(path.Segments, pdfgo.Segment{Operator: "B", Points: []pdfgo.Point{point(segment.Control1), point(segment.Control2), point(segment.End)}})
+		case GeometryClose:
+			path.Segments = append(path.Segments, pdfgo.Segment{Operator: "C"})
+		default:
+			return pdfgo.Path{}, fmt.Errorf("unsupported mask geometry verb %d", segment.Verb)
+		}
+	}
+	if p.maskClips == nil {
+		p.maskClips = make(map[*pdfgo.SoftMask]pdfgo.Path)
+	}
+	p.maskClips[mask] = path
+	return path, nil
+}
+
+// pdfNumbersPathBox 编码PDF坐标矩形的闭合路径
+// 入参: box 矩形边界
+// 返回: string 紧缩路径
+func pdfNumbersPathBox(box pdfgo.Rectangle) string {
+	return "M " + pdfNumbers(box.XMin, box.YMin) + " L " + pdfNumbers(box.XMax, box.YMin) + " L " + pdfNumbers(box.XMax, box.YMax) + " L " + pdfNumbers(box.XMin, box.YMax) + " C"
+}
+
+// maskStyle 将独立图元的二值蒙版附加到裁剪链
+// 入参: style 图形状态
+// 返回: pdfgo.Style 转换后的状态, error 蒙版转换错误
+func (p *pdfImporter) maskStyle(style pdfgo.Style) (pdfgo.Style, error) {
+	if style.SoftMask == nil {
+		return style, nil
+	}
+	clip, err := p.maskClip(style.SoftMask)
+	if err != nil {
+		return style, err
+	}
+	style.Clips = append(append([]pdfgo.Path(nil), style.Clips...), clip)
+	style.SoftMask = nil
+	return style, nil
+}

ofdgo_pdf_object.go

@@ -33,6 +33,17 @@ import (
 // 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 err := p.flushPath(); err != nil {
+		return err
+	}
+	if mark.Image.ImageMask && mark.Style.Fill.Axial != nil {
+		return &pdfgo.UnsupportedError{Feature: "gradient stencil image"}
+	}
+	var err error
+	mark.Style, err = p.maskStyle(mark.Style)
+	if err != nil {
+		return err
+	}
 	if mark.Style.FillOverprint {
 		return &pdfgo.UnsupportedError{Feature: "image color separation overprint"}
 	}
@@ -102,6 +113,17 @@ func (p *pdfImporter) image(mark pdfgo.ImageMark) error {
 // 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 err := p.flushPath(); err != nil {
+		return err
+	}
+	if mark.Style.Fill.Axial != nil || mark.Style.Stroke.Axial != nil {
+		return &pdfgo.UnsupportedError{Feature: "gradient text paint"}
+	}
+	var err error
+	mark.Style, err = p.maskStyle(mark.Style)
+	if err != nil {
+		return err
+	}
 	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"}
 	}
@@ -192,6 +214,7 @@ func (p *pdfImporter) text(mark pdfgo.TextMark) error {
 		color := StrokeColor(*p.color(mark.Style.Stroke))
 		object.StrokeColor = &color
 		object.LineWidth = mark.Style.LineWidth * unit
+		object.LineWidthSet = object.LineWidth == 0
 		object.Join = []string{"Miter", "Round", "Bevel"}[mark.Style.Join]
 		object.MiterLimit = mark.Style.MiterLimit
 		if len(mark.Style.Dash) > 0 {
@@ -234,6 +257,18 @@ func pdfFontProgram(source *pdfgo.Font) ([]byte, error) {
 		return nil, fmt.Errorf("embedded PDF font has no glyphs")
 	}
 	changed := false
+	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")
+	}
+	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"]) > metricLength {
+		tables["hmtx"] = tables["hmtx"][:metricLength]
+		changed = true
+	}
 	if len(tables["cmap"]) == 0 {
 		mapping := map[rune]uint16{}
 		for code := range source.Unicode {

ofdgo_render_compile.go

@@ -260,7 +260,7 @@ func (c *semanticCompiler) objectStyle(object PathObject, defaults *DrawParam, l
 	if defaults != nil {
 		style.fill = defaults.FillColor
 		style.stroke = (*FillColor)(defaults.StrokeColor)
-		if defaults.LineWidth > 0 {
+		if defaults.LineWidth > 0 || defaults.LineWidthSet {
 			style.options.Width = defaults.LineWidth
 		}
 		if defaults.Cap != "" {
@@ -283,7 +283,7 @@ func (c *semanticCompiler) objectStyle(object PathObject, defaults *DrawParam, l
 	if object.StrokeColor != nil {
 		style.stroke = (*FillColor)(object.StrokeColor)
 	}
-	if object.LineWidth > 0 {
+	if object.LineWidth > 0 || object.LineWidthSet {
 		style.options.Width = object.LineWidth
 	}
 	if object.Cap != "" {
@@ -313,6 +313,9 @@ func (c *semanticCompiler) objectStyle(object PathObject, defaults *DrawParam, l
 			style.options.Dashes[i] *= scale
 		}
 	}
+	if style.options.Width == 0 {
+		style.options.Width = 25.4 / c.renderer.DPI
+	}
 	return style
 }
 
@@ -389,7 +392,7 @@ func (c *semanticCompiler) textObject(object TextObject, state RenderState) erro
 		return nil
 	}
 	_, linear := renderObjectMatrix(object.Boundary, NewMatrix(object.CTM), state)
-	style := c.objectStyle(PathObject{DrawParam: object.DrawParam, FillColor: object.FillColor, StrokeColor: object.StrokeColor, Alpha: object.Alpha, LineWidth: object.LineWidth, Join: object.Join, MiterLimit: object.MiterLimit}, state.Defaults, linear)
+	style := c.objectStyle(PathObject{DrawParam: object.DrawParam, FillColor: object.FillColor, StrokeColor: object.StrokeColor, Alpha: object.Alpha, LineWidth: object.LineWidth, LineWidthSet: object.LineWidthSet, Join: object.Join, MiterLimit: object.MiterLimit}, state.Defaults, linear)
 	if style.fill == nil {
 		style.fill = withFillAlpha(&FillColor{}, object.Alpha)
 	}

ofdgo_renderer_geom_canvas.go

@@ -175,7 +175,7 @@ func (CanvasBackend) Combine(left, right GeometryPath, operation GeometryOperati
 	var result *canvas.Path
 	switch operation {
 	case GeometryIntersect:
-		result = a.And(b)
+		result = applyClipPath(a, b)
 	case GeometryUnion:
 		result = a.Or(b)
 	case GeometrySubtract:

ofdgo_renderer_path_canvas.go

@@ -108,7 +108,7 @@ func (s *pathStyle) applyLineJoin(join string, limit float64) {
 // applyDrawParam 应用绘制参数样式
 // 入参: r 渲染器, dp 绘制参数, bx 边界X坐标, by 边界Y坐标, pageH 页面高度, alpha 对象透明度
 func (s *pathStyle) applyDrawParam(r *Renderer, dp *DrawParam, bx, by, pageH float64, alpha *int) {
-	if dp.LineWidth > 0 {
+	if dp.LineWidth > 0 || dp.LineWidthSet {
 		s.lineWidth = dp.LineWidth
 	}
 	if dp.FillColor != nil {
@@ -132,7 +132,7 @@ func (s *pathStyle) applyDrawParam(r *Renderer, dp *DrawParam, bx, by, pageH flo
 // applyPathObject 应用路径对象样式
 // 入参: r 渲染器, obj 路径对象, bx 边界X坐标, by 边界Y坐标, pageH 页面高度
 func (s *pathStyle) applyPathObject(r *Renderer, obj PathObject, bx, by, pageH float64) {
-	if obj.LineWidth > 0 {
+	if obj.LineWidth > 0 || obj.LineWidthSet {
 		s.lineWidth = obj.LineWidth
 	}
 	if obj.FillColor != nil {
@@ -210,6 +210,9 @@ func (r *Renderer) renderPath(ctx *canvas.Context, obj PathObject, pageH float64
 	}
 	style.applyPathObject(r, obj, bx, by, pageH)
 	style.scale(ctm)
+	if style.lineWidth == 0 {
+		style.lineWidth = 25.4 / r.DPI
+	}
 	objectCTM := TranslationMatrix(bx, by).Multiply(ctm)
 	if boundaryInCTM && parentCTM != nil {
 		objectCTM = parentCTM.Multiply(TranslationMatrix(bx, by)).Multiply(localCTM)

ofdgo_renderer_text_canvas.go

@@ -110,7 +110,7 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 		if obj.StrokeColor != nil {
 			strokeStyle.applyStrokeColor(r, obj.StrokeColor, bx, by, pageH, obj.Alpha)
 		}
-		if obj.LineWidth > 0 {
+		if obj.LineWidth > 0 || obj.LineWidthSet {
 			strokeStyle.lineWidth = obj.LineWidth
 		}
 		strokeStyle.applyLineJoin(obj.Join, obj.MiterLimit)
@@ -118,6 +118,9 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 			strokeStyle.strokePaint = colorWithAlpha(canvas.Black, obj.Alpha)
 		}
 		strokeStyle.scale(ctm)
+		if strokeStyle.lineWidth == 0 {
+			strokeStyle.lineWidth = 25.4 / r.DPI
+		}
 		transformShdPaint(strokeStyle.strokePaint, parentCTM, bx, by, pageH, boundaryInCTM)
 		strokeStyle.strokePaint, shadingClip, strokeView = resolveShdPaint(ctx, strokeStyle.strokePaint)
 		strokeClip = intersectClipPath(strokeClip, shadingClip)

ofdgo_res.go

@@ -78,24 +78,25 @@ type DrawParams struct {
 
 // DrawParam 绘制参数
 type DrawParam struct {
-	ID             string   `xml:"ID,attr"`
-	Relative       string   `xml:"Relative,attr"`
-	ResourceID     string   `xml:"ResourceID,attr"`
-	BaseLoc        string   `xml:"BaseLoc,attr"`
-	Link           string   `xml:"Link,attr"`
-	LineWidth      float64  `xml:"LineWidth,attr"`
-	Join           string   `xml:"Join,attr"`
-	Cap            string   `xml:"Cap,attr"`
-	DashOffset     *float64 `xml:"DashOffset,attr"`
-	DashPattern    string   `xml:"DashPattern,attr"`
+	ID          string       `xml:"ID,attr"`
+	Relative    string       `xml:"Relative,attr"`
+	ResourceID  string       `xml:"ResourceID,attr"`
+	BaseLoc     string       `xml:"BaseLoc,attr"`
+	Link        string       `xml:"Link,attr"`
+	LineWidth   float64      `xml:"LineWidth,attr"`
+	Join        string       `xml:"Join,attr"`
+	Cap         string       `xml:"Cap,attr"`
+	DashOffset  *float64     `xml:"DashOffset,attr"`
+	DashPattern string       `xml:"DashPattern,attr"`
+	MiterLimit  float64      `xml:"MiterLimit,attr"`
+	Font        string       `xml:"Font,attr"`
+	Size        float64      `xml:"Size,attr"`
+	Weight      int          `xml:"Weight,attr"`
+	Italic      bool         `xml:"Italic,attr"`
+	FillColor   *FillColor   `xml:"FillColor"`
+	StrokeColor *StrokeColor `xml:"StrokeColor"`
+	LineWidthSet   bool `xml:"-"`
 	dashPatternSet bool
-	MiterLimit     float64      `xml:"MiterLimit,attr"`
-	Font           string       `xml:"Font,attr"`
-	Size           float64      `xml:"Size,attr"`
-	Weight         int          `xml:"Weight,attr"`
-	Italic         bool         `xml:"Italic,attr"`
-	FillColor      *FillColor   `xml:"FillColor"`
-	StrokeColor    *StrokeColor `xml:"StrokeColor"`
 }
 
 // CompositeGraphicUnits 复合图元集合

ofdgo_sign_policy.go

@@ -260,7 +260,6 @@ func (r *Reader) applySignatureCoverage(report *SignatureVerifyReport, listPath
 		for name := range r.files {
 			include(name)
 		}
-		// 可达文件始终必需, 不允许伪装为签名载体后排除
 		if err := r.signatureCoverageReferences(o.DocRoot, required); err != nil {
 			report.CoverageOK, report.CoverageError = false, err.Error()
 		}

ofdgo_sign_ses.go

@@ -330,7 +330,6 @@ func parseSESSeal(raw asn1.RawValue) (*sesSeal, error) {
 		if info.Version != 5 {
 			return nil, fmt.Errorf("unexpected timestamp in ses seal version %d", info.Version)
 		}
-		// V5仅保留解析能力, 不将未验证的制章时间戳当作可信时间
 		timestampRaw = append([]byte(nil), items[4].FullBytes...)
 	}
 	picType, picData, err := parseSESPicture(infoItems[3])

ofdgo_text_shape.go

@@ -128,7 +128,6 @@ func layoutShapedText(obj *TextObject, value string, options TextLayout, metrics
 				if options.Shaping.Bidi {
 					shift = visualShifts[glyph.Cluster]
 				} else if options.Shaping.Direction == "rtl" {
-					// 逻辑簇后的间距位于视觉左侧，整行不计末尾字距
 					shift = extra[len(chars)] - extra[glyph.Cluster] - options.LetterSpacing
 				}
 				gx, gy := x+glyph.X*hScale+shift, y+glyph.Y

ofdgo_text_xml.go

@@ -68,5 +68,10 @@ func (obj *TextObject) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement
 		}
 	}
 	*obj = TextObject(value)
+	for _, attr := range start.Attr {
+		if attr.Name.Local == "LineWidth" {
+			obj.LineWidthSet = obj.LineWidth == 0
+		}
+	}
 	return nil
 }

ofdgo_writer.go

@@ -668,6 +668,9 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 		attrs.number("ReadDirection", float64(obj.ReadDirection))
 		attrs.number("CharDirection", float64(obj.CharDirection))
 		attrs.number("LineWidth", obj.LineWidth)
+		if obj.LineWidthSet && obj.LineWidth == 0 {
+			attrs.add("LineWidth", "0")
+		}
 		attrs.number("MiterLimit", obj.MiterLimit)
 		attrs.add("Join", obj.Join)
 		if obj.Italic {
@@ -686,6 +689,9 @@ func (x *ofdXML) object(object GraphicObject, root bool) {
 		attrs.add("Boundary", obj.Boundary)
 		attrs.add("CTM", obj.CTM)
 		attrs.number("LineWidth", obj.LineWidth)
+		if obj.LineWidthSet && obj.LineWidth == 0 {
+			attrs.add("LineWidth", "0")
+		}
 		attrs.number("MiterLimit", obj.MiterLimit)
 		attrs.add("Join", obj.Join)
 		attrs.add("Cap", obj.Cap)