Update bundled libpng to last upstream version 1.6.54

1 files changed, 33 insertions, 30 deletions

diff --git a/png/png.5 b/png/png.5
index c230915b4..8bf1b54cb 100644
--- a/png/png.5
+++ b/png/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "July 1, 2025"
+.TH PNG 5 "January 12, 2026"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 
@@ -6,73 +6,76 @@ png \- Portable Network Graphics (PNG) format
 PNG (Portable Network Graphics) is an extensible file format for the
 lossless, portable, well-compressed storage of raster images.  PNG
 provides a patent-free replacement for GIF, and can also replace many
-common uses of TIFF. Indexed-color, grayscale, and truecolor images are
-supported, plus an optional alpha channel.  Sample depths range from
-1 to 16 bits.
-.br
+common uses of TIFF. Indexed-color, grayscale, and truecolor images
+are supported, plus an optional alpha channel.  Sample depths range
+from 1 to 16 bits.
+.P
 PNG is designed to work well in online viewing applications, such
 as the World Wide Web, so it is fully streamable with a progressive
 display option.  PNG is robust, providing both full file integrity
 checking and fast, simple detection of common transmission errors.
-Also, PNG can store gamma and chromaticity data for improved color
-matching on heterogeneous platforms.
+Also, PNG can store color space data for improved color matching on
+heterogeneous platforms.
 
 .SH "SEE ALSO"
 .BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
 .LP
-PNG Specification (Third Edition), June 2025:
+Portable Network Graphics (PNG) Specification (Third Edition):
 .IP
 .br
+W3C Recommendation 24 June 2025
+.br
 https://www.w3.org/TR/2025/REC-png-3-20250624/
 .LP
-PNG Specification (Second Edition), November 2003:
+Portable Network Graphics (PNG) Specification (Second Edition):
+.IP
+.br
+ISO/IEC 15948:2004(E)
+.br
+https://www.iso.org/standard/29581.html
 .IP
 .br
+W3C Recommendation 10 November 2003
+.br
 https://www.w3.org/TR/2003/REC-PNG-20031110/
 .LP
-PNG 1.2 Specification, August 1999:
+Portable Network Graphics (PNG) Specification Version 1.2:
 .IP
 .br
+Published by the PNG Development Group on 14 July 1999
+.br
 https://www.libpng.org/pub/png/spec/1.2/
 .LP
-PNG 1.1 Specification, December 1998:
+Portable Network Graphics (PNG) Specification Version 1.1:
 .IP
 .br
+Published by the PNG Development Group on 15 February 1999
+.br
 https://www.libpng.org/pub/png/spec/1.1/
 .LP
-PNG 1.0 Specification, October 1996:
+Portable Network Graphics (PNG) Specification Version 1.0:
 .IP
 .br
-RFC 2083
+IETF RFC 2083, March 1997
 .br
 https://www.ietf.org/rfc/rfc2083.txt
 .IP
 .br
-or W3C Recommendation
+W3C Recommendation 1 October 1996
 .br
 https://www.w3.org/TR/REC-png-961001
 
 .SH AUTHORS
-This man page: Glenn Randers-Pehrson, Cosmin Truta
+This man page: Glenn Randers-Pehrson, Cosmin Truta, Chris Lilley.
 .LP
-Portable Network Graphics (PNG) Specification (Third Edition).
-W3C Recommendation 24 June 2025:
-Chris Blume et al.
+PNG Specification (Third Edition): Chris Blume et al.
 .LP
-Portable Network Graphics (PNG) Specification (Second Edition)
-Information technology - Computer graphics and image processing -
-Portable Network Graphics (PNG): Functional specification.
-ISO/IEC 15948:2003 (E), W3C Recommendation 10 November 2003:
-David Duce et al.
+PNG Specification (Second Edition): David Duce et al.
 .LP
-Portable Network Graphics (PNG) Specification Version 1.2 (11 August 1999):
-Glenn Randers-Pehrson et al.
+PNG Specification Version 1.2: Glenn Randers-Pehrson et al.
 .LP
-Portable Network Graphics (PNG) Specification Version 1.1 (31 December 1998):
-Glenn Randers-Pehrson et al.
+PNG Specification Version 1.1: Glenn Randers-Pehrson et al.
 .LP
-Portable Network Graphics (PNG) Specification Version 1.0.
-IETF RFC 2083, W3C Recommendation 1 October 1996:
-Thomas Boutell et al.
+PNG Specification Version 1.0: Thomas Boutell et al.
 
 .\" end of man page