From ad00e95ae6ce1fd89abdd6dbc879be76dce5c323 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Sun, 13 Sep 2026 23:49:21 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E6=80=A7=E8=83=BD=E4=BC=98=E5=8C=96):=20?=
 =?UTF-8?q?=E4=BC=98=E5=8C=96PDF=E5=AD=97=E5=BD=A2=E5=A4=8D=E7=94=A8?=
 =?UTF-8?q?=EF=BC=8C=E9=99=8D=E4=BD=8E=E5=A4=9A=E9=A1=B5=E5=AF=BC=E5=87=BA?=
 =?UTF-8?q?=E8=80=97=E6=97=B6=E4=B8=8E=E5=86=85=E5=AD=98=E5=88=86=E9=85=8D?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ofdgo_renderer_output.go |  3 ++-
 ofdgo_renderer_pdf.go    | 21 +++++++++++++++++++++
 ofdgo_renderer_text.go   |  5 +++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/ofdgo_renderer_output.go b/ofdgo_renderer_output.go
index e4167fb..b7eca0c 100644
--- a/ofdgo_renderer_output.go
+++ b/ofdgo_renderer_output.go
@@ -244,13 +244,14 @@ func (r *Renderer) renderPDFPages(pages []pdfPage, writer io.Writer) error {
 	}
 	start := buf.Len()
 	p := pdf.New(buf, pages[0].Box.W, pages[0].Box.H, nil)
+	renderer := &pdfRenderer{PDF: p, glyphPaths: make(map[*canvas.Path]*canvas.Path)}
 	p.SetInfo("", "", "", "", "xiaoqidun/ofdgo")
 	for i, page := range pages {
 		if i > 0 {
 			p.NewPage(page.Box.W, page.Box.H)
 		}
 		navigation.apply(p, i)
-		if err := r.renderPageToContext(canvas.NewContext(p), page.Content, true); err != nil {
+		if err := r.renderPageToContext(canvas.NewContext(renderer), page.Content, true); err != nil {
 			buf.Truncate(start)
 			return fmt.Errorf("failed to render page %d: %w", i+1, err)
 		}
diff --git a/ofdgo_renderer_pdf.go b/ofdgo_renderer_pdf.go
index b55a4c4..d7b749f 100644
--- a/ofdgo_renderer_pdf.go
+++ b/ofdgo_renderer_pdf.go
@@ -21,6 +21,27 @@ import (
 	"github.com/tdewolff/canvas/renderers/pdf"
 )
 
+// pdfRenderer PDF渲染器
+type pdfRenderer struct {
+	*pdf.PDF
+	glyphPaths map[*canvas.Path]*canvas.Path
+}
+
+// glyphPath 复用相似变换下的PDF字形圆弧转换
+// 入参: path 缓存字形路径, matrix 字形变换
+// 返回: *canvas.Path PDF字形路径
+func (r *pdfRenderer) glyphPath(path *canvas.Path, matrix canvas.Matrix) *canvas.Path {
+	if !matrix.IsSimilarity() {
+		return path
+	}
+	if cached, ok := r.glyphPaths[path]; ok {
+		return cached
+	}
+	converted := path.ReplaceArcs()
+	r.glyphPaths[path] = converted
+	return converted
+}
+
 // pdfPage PDF页面数据
 type pdfPage struct {
 	Content *PageContent
diff --git a/ofdgo_renderer_text.go b/ofdgo_renderer_text.go
index ce29d71..ae8b01e 100644
--- a/ofdgo_renderer_text.go
+++ b/ofdgo_renderer_text.go
@@ -396,6 +396,11 @@ func (r *Renderer) renderText(ctx *canvas.Context, obj TextObject, pageH float64
 							scaleX = advanceLimit / glyphWidth
 						}
 						textWidth = glyphWidth * scaleX
+						if face.FauxBold != 0 {
+							if renderer, ok := ctx.Renderer.(*pdfRenderer); ok {
+								glyphPath = renderer.glyphPath(glyphPath, ctx.View().Scale(scaleX, 1))
+							}
+						}
 						if scaleX != 1 {
 							ctx.Push()
 							ctx.Translate(x, y)