feat(转换渲染): 保留PDF结构并优化渲染

internal/base/font/ttf.go

@@ -29,7 +29,6 @@ func NormalizeOS2(data []byte) []byte {
 	var size int
 	switch binary.BigEndian.Uint16(data) {
 	case 0:
-		// 旧式68字节表保持原样，不将截断的78字节表推断为旧式表
 		size = 78
 	case 1:
 		size = 86

internal/base/geom/stroke.go

@@ -17,6 +17,7 @@ package geom
 import (
 	"fmt"
 	"math"
+	"slices"
 )
 
 // UnsupportedError 表示当前几何实现无法展开的描边形态
@@ -347,7 +348,22 @@ func (line geometryPolyline) stroke(result Path, options StrokeOptions) (Path, e
 		}
 		return result, nil
 	}
-	directions := make([]Point, len(points)-1)
+	segments := len(points) - 1
+	joins := segments - 1
+	caps := 0
+	if line.closed {
+		joins++
+	} else if options.Cap == "Round" {
+		caps = 8
+	} else if options.Cap == "Square" {
+		caps = 10
+	}
+	joinSize := 4
+	if options.Join == "" || options.Join == "Miter" {
+		joinSize = 5
+	}
+	result = slices.Grow(result, min(segments*5+joins*joinSize+caps, 1<<20-len(result)))
+	directions := make([]Point, segments)
 	for i := range directions {
 		a, b := points[i], points[i+1]
 		length := math.Hypot(b.X-a.X, b.Y-a.Y)

internal/codec/pdf/export.go

@@ -31,10 +31,11 @@ type TextPage struct {
 	Replacements []pdfgo.TextReplacement
 }
 
-// WriteOptions 保存PDF最终写出所需的像素、文字和导航修正
+// WriteOptions 保存PDF最终写出所需的元数据、像素、文字和导航修正
 // Images逐页记录绘制图像，nil图像表示不替换；Links保留全部链接位置，包括矩形区域的nil项
 // PrepareRewrite在页面引用确定后填充导航动作，不得提前写出PDF
 type WriteOptions struct {
+	Information    pdfgo.Dictionary
 	Images         [][]image.Image
 	Text           []TextPage
 	Links          map[int][]*pdfgo.LinkRegion
@@ -49,7 +50,7 @@ type WriteOptions struct {
 // 返回: error 资源、压缩或写入错误
 func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOptions) error {
 	nativeWrite := settings.PrepareRewrite != nil
-	if !settings.ExactImages && !settings.ExactText && !nativeWrite && settings.Optimization.Compression.Mode == pdfgo.CompressionUnchanged {
+	if !settings.ExactImages && !settings.ExactText && !nativeWrite && len(settings.Information) == 0 && settings.Optimization.Compression.Mode == pdfgo.CompressionUnchanged {
 		if err := ctx.Err(); err != nil {
 			return err
 		}
@@ -65,6 +66,10 @@ func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOpt
 	}
 	defer reader.Close()
 	if !settings.ExactImages && !settings.ExactText && !nativeWrite {
+		if len(settings.Information) != 0 {
+			_, err := reader.RewriteTo(ctx, writer, pdfgo.RewriteOptions{Information: settings.Information, Optimization: settings.Optimization})
+			return err
+		}
 		_, err := reader.OptimizeTo(ctx, writer, settings.Optimization)
 		return err
 	}
@@ -171,7 +176,7 @@ func Write(ctx context.Context, data []byte, writer io.Writer, settings WriteOpt
 	if pages != len(settings.Images) {
 		return fmt.Errorf("PDF output page missing")
 	}
-	options := pdfgo.RewriteOptions{Images: images, ImageOptions: pdfgo.ImageWriteOptions{PreblendBinary: true}, LinkRegions: links, TextReplacements: texts, Optimization: settings.Optimization}
+	options := pdfgo.RewriteOptions{Information: settings.Information, Images: images, ImageOptions: pdfgo.ImageWriteOptions{PreblendBinary: true}, LinkRegions: links, TextReplacements: texts, Optimization: settings.Optimization}
 	if nativeWrite {
 		if err := settings.PrepareRewrite(ctx, reader, references, &options); err != nil {
 			return err