From 75b6943e10c85bb6925cda3a24e9b4dd10b31447 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Thu, 15 Oct 2026 14:25:05 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E5=AD=97=E4=BD=93=E5=A4=84=E7=90=86):=20?=
 =?UTF-8?q?=E9=99=8D=E4=BD=8E=E5=AD=97=E4=BD=93=E8=A3=81=E5=89=AA=E5=86=85?=
 =?UTF-8?q?=E5=AD=98=E5=BC=80=E9=94=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 internal/base/font/subset.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/internal/base/font/subset.go b/internal/base/font/subset.go
index 5f5ee91..9763ce8 100644
--- a/internal/base/font/subset.go
+++ b/internal/base/font/subset.go
@@ -227,9 +227,18 @@ func SubsetSourceSFNT(data []byte, usage *Usage) []byte {
 	for _, dependency := range dependencies {
 		glyphs[dependency] = true
 	}
-	var glyf, loca []byte
+	glyfSize := 0
+	for id, retained := range glyphs {
+		if retained {
+			data, _ := trueTypeGlyphData(sfnt.Tables, id)
+			glyfSize += len(data) + len(data)%2
+		}
+	}
+	locaFormat := binary.BigEndian.Uint16(sfnt.Tables["head"][50:])
+	glyf := make([]byte, 0, glyfSize)
+	loca := make([]byte, 0, (int(sfnt.NumGlyphs())+1)*(2+2*int(locaFormat)))
 	for id := 0; id <= int(sfnt.NumGlyphs()); id++ {
-		if binary.BigEndian.Uint16(sfnt.Tables["head"][50:]) == 0 {
+		if locaFormat == 0 {
 			loca = binary.BigEndian.AppendUint16(loca, uint16(len(glyf)/2))
 		} else {
 			loca = binary.BigEndian.AppendUint32(loca, uint32(len(glyf)))