From e5e8063c4ed92491a650c5f8e3aef6d59dd35842 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Wed, 1 Jul 2026 14:43:04 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E5=AD=97=E4=BD=93=E6=B8=B2=E6=9F=93):=20?=
 =?UTF-8?q?=E5=8A=A0=E5=BC=BA=E5=AD=97=E4=BD=93=E5=85=BC=E5=AE=B9?=
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---
 ofdgo_font_ttf.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/ofdgo_font_ttf.go b/ofdgo_font_ttf.go
index bcc70b1..e282c67 100644
--- a/ofdgo_font_ttf.go
+++ b/ofdgo_font_ttf.go
@@ -97,6 +97,26 @@ func fixTrueType(data []byte, fixCmap, fixName bool) (bool, []byte, map[rune]uin
 	if numGlyphs == 0 {
 		numGlyphs = 255
 	}
+	if !missingHhea && !missingHmtx {
+		hhea := existingTables["hhea"]
+		hmtx := existingTables["hmtx"]
+		if len(hhea) < 36 {
+			missingHhea = true
+		} else {
+			numMetrics := binary.BigEndian.Uint16(hhea[34:36])
+			if numMetrics == 0 || numMetrics > numGlyphs {
+				missingHhea = true
+			} else {
+				expectHmtx := int(numMetrics)*4 + int(numGlyphs-numMetrics)*2
+				if len(hmtx) < expectHmtx {
+					missingHmtx = true
+				} else if len(hmtx) > expectHmtx {
+					existingTables["hmtx"] = hmtx[:expectHmtx]
+					malformedDirectory = true
+				}
+			}
+		}
+	}
 	if !missingPost && hasBadPostTable(existingTables["post"], numGlyphs, !isCFFSfnt) {
 		missingPost = true
 	}