From 8c6dfc33016eeb64e493d47c218da7ecd1f24f7e Mon Sep 17 00:00:00 2001
From: Milan Nikolic <gen2brain@gmail.com>
Date: Tue, 25 Aug 2026 12:26:49 +0200
Subject: [PATCH] Use pngn for PNG inside documents

---
 cbconvert_convert.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cbconvert_convert.go b/cbconvert_convert.go
index d620e75..a8fca82 100644
--- a/cbconvert_convert.go
+++ b/cbconvert_convert.go
@@ -367,6 +367,10 @@ func init() {
 	folio.RegisterPictureDecoder("jpeg", "\xff\xd8", func(b []byte) (image.Image, error) {
 		return jpegn.Decode(bytes.NewReader(b), nil)
 	})
+
+	folio.RegisterPictureDecoder("png", "\x89PNG\r\n\x1a\n", func(b []byte) (image.Image, error) {
+		return pngn.Decode(bytes.NewReader(b))
+	})
 }
 
 func (c *Converter) imageDecode(reader io.Reader) (image.Image, error) {