Update bundled libpng to version 1.6.50 dated 2025-07-01

1 files changed, 18 insertions, 14 deletions

diff --git a/png/libpng.3 b/png/libpng.3
index 5a3c89cb9..8980a252b 100644
--- a/png/libpng.3
+++ b/png/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "September 12, 2024"
+.TH LIBPNG 3 "July 1, 2025"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.44
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.50
 
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -223,7 +223,7 @@ libpng \- Portable Network Graphics (PNG) Reference Library 1.6.44
 
 \fBint png_image_begin_read_from_file (png_imagep \fP\fIimage\fP\fB, const char \fI*file_name\fP\fB);\fP
 
-\fBint png_image_begin_read_from_stdio (png_imagep \fP\fIimage\fP\fB, FILE* \fIfile\fP\fB);\fP
+\fBint png_image_begin_read_from_stdio (png_imagep \fP\fIimage\fP\fB, FILE *\fIfile\fP\fB);\fP
 
 \fBint, png_image_begin_read_from_memory (png_imagep \fP\fIimage\fP\fB, png_const_voidp \fP\fImemory\fP\fB, size_t \fIsize\fP\fB);\fP
 
@@ -519,7 +519,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng
 
- Copyright (c) 2018-2024 Cosmin Truta
+ Copyright (c) 2018-2025 Cosmin Truta
  Copyright (c) 1998-2018 Glenn Randers-Pehrson
 
  This document is released under the libpng license.
@@ -528,9 +528,9 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng version 1.6.36, December 2018, through 1.6.44 - September 2024
+ libpng version 1.6.36, December 2018, through 1.6.50 - July 2025
  Updated and distributed by Cosmin Truta
- Copyright (c) 2018-2024 Cosmin Truta
+ Copyright (c) 2018-2025 Cosmin Truta
 
  libpng versions 0.97, January 1998, through 1.6.35 - July 2018
  Updated and distributed by Glenn Randers-Pehrson
@@ -584,18 +584,22 @@ Libpng was written as a companion to the PNG specification, as a way
 of reducing the amount of time and effort it takes to support the PNG
 file format in application programs.
 
-The PNG specification (second edition), November 2003, is available as
+The PNG specification (Third Edition), June 2025, is available as
+a W3C Recommendation at
+<https://www.w3.org/TR/2025/REC-png-3-20250624/>.
+
+The PNG specification (Second Edition), November 2003, is available as
 a W3C Recommendation and as an ISO Standard (ISO/IEC 15948:2004 (E)) at
 <https://www.w3.org/TR/2003/REC-PNG-20031110/>.
 The W3C and ISO documents have identical technical content.
 
 The PNG-1.2 specification is available at
-<https://png-mng.sourceforge.io/pub/png/spec/1.2/>.
-It is technically equivalent
-to the PNG specification (second edition) but has some additional material.
+<https://www.libpng.org/pub/png/spec/1.2/>.
+It is technically equivalent to the PNG specification (Second Edition)
+but has some additional material.
 
 The PNG-1.0 specification is available as RFC 2083 at
-<https://png-mng.sourceforge.io/pub/png/spec/1.0/> and as a
+<https://www.libpng.org/pub/png/spec/1.0/> and as a
 W3C Recommendation at <https://www.w3.org/TR/REC-png-961001>.
 
 Some additional chunks are described in the special-purpose public chunks
@@ -4608,7 +4612,7 @@ READ APIs
      is filled in from the PNG header in the file.
 
    int png_image_begin_read_from_stdio (png_imagep image,
-     FILE* file)
+     FILE *file)
 
       The PNG header is read from the stdio FILE object.
 
@@ -4683,7 +4687,7 @@ be written:
       int convert_to_8_bit, const void *buffer,
       png_int_32 row_stride, const void *colormap)
 
-      Write the image to the given (FILE*).
+      Write the image to the given FILE object.
 
 With all write APIs if image is in one of the linear formats with
 (png_uint_16) data then setting convert_to_8_bit will cause the output to be
@@ -5692,7 +5696,7 @@ a pre-existing bug where the per-chunk 'keep' setting is ignored, and makes
 it possible to skip IDAT chunks in the sequential reader.
 
 The machine-generated configure files are no longer included in branches
-libpng16 and later of the GIT repository.  They continue to be included
+libpng17 and later of the GIT repository.  They continue to be included
 in the tarball releases, however.
 
 Libpng-1.6.0 through 1.6.2 used the CMF bytes at the beginning of the IDAT