Release libpng version 1.6.50

Also make editorial changes regarding the previous PNG specifications.

ANNOUNCE

@@ -1,13 +1,5 @@
-libpng 1.6.50.git
-=================
-
-This is a development version, not intended to be a public release.
-It will be replaced by a public release, or by another development
-version, at a later time.
-
-
-libpng 1.6.49 - June 12, 2025
-=============================
+libpng 1.6.50 - July 1, 2025
+============================
 
 This is a public release of libpng, intended for use in production code.
 
@@ -17,13 +9,13 @@ Files available for download
 
 Source files with LF line endings (for Unix/Linux):
 
- * libpng-1.6.49.tar.xz (LZMA-compressed, recommended)
- * libpng-1.6.49.tar.gz (deflate-compressed)
+ * libpng-1.6.50.tar.xz (LZMA-compressed, recommended)
+ * libpng-1.6.50.tar.gz (deflate-compressed)
 
 Source files with CRLF line endings (for Windows):
 
- * lpng1649.7z (LZMA-compressed, recommended)
- * lpng1649.zip (deflate-compressed)
+ * lpng1650.7z (LZMA-compressed, recommended)
+ * lpng1650.zip (deflate-compressed)
 
 Other information:
 
@@ -33,13 +25,18 @@ Other information:
  * TRADEMARK.md
 
 
-Changes from version 1.6.48 to version 1.6.49
+Changes from version 1.6.49 to version 1.6.50
 ---------------------------------------------
 
- * Added SIMD-optimized code for the RISC-V Vector Extension (RVV).
-   (Contributed by Manfred Schlaegl, Dragos Tiselice and Filip Wasil)
- * Added various fixes and improvements to the build scripts and to
-   the sample code.
+ * Improved the detection of the RVV Extension on the RISC-V platform.
+   (Contributed by Filip Wasil)
+ * Replaced inline ASM with C intrinsics in the RVV code.
+   (Contributed by Filip Wasil)
+ * Fixed a decoder defect in which unknown chunks trailing IDAT, set
+   to go through the unknown chunk handler, incorrectly triggered
+   out-of-place IEND errors.
+   (Contributed by John Bowler)
+ * Fixed the CMake file for cross-platform builds that require `libm`.
 
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.

CHANGES

@@ -6267,7 +6267,16 @@ Version 1.6.49 [June 12, 2025]
   Added various fixes and improvements to the build scripts and to
     the sample code.
 
-Version 1.6.50 [TODO]
+Version 1.6.50 [July 1, 2025]
+  Improved the detection of the RVV Extension on the RISC-V platform.
+    (Contributed by Filip Wasil)
+  Replaced inline ASM with C intrinsics in the RVV code.
+    (Contributed by Filip Wasil)
+  Fixed a decoder defect in which unknown chunks trailing IDAT, set
+    to go through the unknown chunk handler, incorrectly triggered
+    out-of-place IEND errors.
+    (Contributed by John Bowler)
+  Fixed the CMake file for cross-platform builds that require `libm`.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net.
 Subscription is required; visit

CMakeLists.txt

@@ -19,8 +19,8 @@ cmake_minimum_required(VERSION 3.14...4.0)
 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 6)
 set(PNGLIB_REVISION 50)
-#set(PNGLIB_SUBREVISION 0)
-set(PNGLIB_SUBREVISION "git")
+set(PNGLIB_SUBREVISION 0)
+#set(PNGLIB_SUBREVISION "git")
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_REVISION})
 set(PNGLIB_ABI_VERSION ${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_SHARED_VERSION ${PNGLIB_ABI_VERSION}.${PNGLIB_REVISION}.${PNGLIB_SUBREVISION})

Makefile.in

@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.18 from Makefile.am.
+# Makefile.in generated by automake 1.18.1 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994-2025 Free Software Foundation, Inc.

README

@@ -1,5 +1,5 @@
-README for libpng version 1.6.50.git
-====================================
+README for libpng version 1.6.50
+================================
 
 See the note about version numbers near the top of `png.h`.
 See `INSTALL` for instructions on how to install libpng.

aclocal.m4

@@ -1,4 +1,4 @@
-# generated automatically by aclocal 1.18 -*- Autoconf -*-
+# generated automatically by aclocal 1.18.1 -*- Autoconf -*-
 
 # Copyright (C) 1996-2025 Free Software Foundation, Inc.
 
@@ -35,7 +35,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
 [am__api_version='1.18'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.18], [],
+m4_if([$1], [1.18.1], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -51,7 +51,7 @@ m4_define([_AM_AUTOCONF_VERSION], [])
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.18])dnl
+[AM_AUTOMAKE_VERSION([1.18.1])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])

compile

@@ -1,7 +1,7 @@
 #! /bin/sh
 # Wrapper for compilers which do not understand '-c -o'.
 
-scriptversion=2025-02-03.05; # UTC
+scriptversion=2025-06-18.21; # UTC
 
 # Copyright (C) 1999-2025 Free Software Foundation, Inc.
 # Written by Tom Tromey <tromey@cygnus.com>.
@@ -358,7 +358,7 @@ exit $ret
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

config.h.in

@@ -108,12 +108,6 @@
 /* Enable POWERPC VSX optimizations */
 #undef PNG_POWERPC_VSX_OPT
 
-/* Turn on RISC-V Vector optimizations at run-time */
-#undef PNG_RISCV_RVV_API_SUPPORTED
-
-/* Check for RISC-V Vector support at run-time */
-#undef PNG_RISCV_RVV_CHECK_SUPPORTED
-
 /* Enable RISCV RVV optimizations */
 #undef PNG_RISCV_RVV_OPT
 

configure

@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.72 for libpng 1.6.50.git.
+# Generated by GNU Autoconf 2.72 for libpng 1.6.50.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -614,8 +614,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.6.50.git'
-PACKAGE_STRING='libpng 1.6.50.git'
+PACKAGE_VERSION='1.6.50'
+PACKAGE_STRING='libpng 1.6.50'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''
 
@@ -1424,7 +1424,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-'configure' configures libpng 1.6.50.git to adapt to many kinds of systems.
+'configure' configures libpng 1.6.50 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1495,7 +1495,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.6.50.git:";;
+     short | recursive ) echo "Configuration of libpng 1.6.50:";;
    esac
   cat <<\_ACEOF
 
@@ -1597,8 +1597,8 @@ Optional Features:
                           api, yes/on: no/off: disable the optimizations;
                           check: use internal checking code api: disable by
                           default, enable by a call to png_set_option yes/on:
-                          turn on unconditionally. If not specified:
-                          determined by the compiler.
+                          turn on. If not specified: determined by the
+                          compiler.
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -1698,7 +1698,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-libpng configure 1.6.50.git
+libpng configure 1.6.50
 generated by GNU Autoconf 2.72
 
 Copyright (C) 2023 Free Software Foundation, Inc.
@@ -1961,7 +1961,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by libpng $as_me 1.6.50.git, which was
+It was created by libpng $as_me 1.6.50, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   $ $0$ac_configure_args_raw
@@ -3446,7 +3446,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='libpng'
- VERSION='1.6.50.git'
+ VERSION='1.6.50'
 
 
 printf "%s\n" "#define PACKAGE \"$PACKAGE\"" >>confdefs.h
@@ -3665,7 +3665,7 @@ fi
 
 
 
-PNGLIB_VERSION=1.6.50.git
+PNGLIB_VERSION=1.6.50
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=50
@@ -15716,28 +15716,14 @@ printf "%s\n" "#define PNG_RISCV_RVV_OPT 0" >>confdefs.h
 
          # Prevent inclusion of the platform-specific files below:
          enable_riscv_rvv=no ;;
-      check)
-
-printf "%s\n" "#define PNG_RISCV_RVV_CHECK_SUPPORTED /**/" >>confdefs.h
-
-         { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: --enable-riscv-rvv Please check contrib/riscv-rvv/README file
-            for the list of supported OSes." >&5
-printf "%s\n" "$as_me: WARNING: --enable-riscv-rvv Please check contrib/riscv-rvv/README file
-            for the list of supported OSes." >&2;};;
-      api)
-
-printf "%s\n" "#define PNG_RISCV_RVV_API_SUPPORTED /**/" >>confdefs.h
-;;
       yes|on)
 
 printf "%s\n" "#define PNG_RISCV_RVV_OPT 2" >>confdefs.h
 
-         { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: --enable-riscv-rvv: please specify 'check' or 'api', if
-            you want the optimizations unconditionally pass e.g. '-march=rv64gv1p0'
-            to the compiler." >&5
-printf "%s\n" "$as_me: WARNING: --enable-riscv-rvv: please specify 'check' or 'api', if
-            you want the optimizations unconditionally pass e.g. '-march=rv64gv1p0'
-            to the compiler." >&2;};;
+         { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: --enable-riscv-rvv:
+            if you want the optimizations pass e.g. '-march=rv64gv1p0' to the compiler." >&5
+printf "%s\n" "$as_me: WARNING: --enable-riscv-rvv:
+            if you want the optimizations pass e.g. '-march=rv64gv1p0' to the compiler." >&2;};;
       *)
          as_fn_error $? "--enable-riscv-rvv=${enable_riscv_rvv}: invalid value" "$LINENO" 5
    esac
@@ -15754,8 +15740,6 @@ then
    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether to use RISC-V RVV intrinsics" >&5
 printf %s "checking whether to use RISC-V RVV intrinsics... " >&6; }
 
-   save_CFLAGS=$CFLAGS
-   CFLAGS="$CFLAGS -march=rv64gv1p0"
    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -15787,7 +15771,6 @@ printf "%s\n" "#define PNG_RISCV_RVV_OPT 1" >>confdefs.h
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: WARNING: Compiler does not support riscv rvv." >&5
 printf "%s\n" "$as_me: WARNING: Compiler does not support riscv rvv." >&2;}
    fi
-   CFLAGS=$save_CFLAGS
 fi
 
 # Add RISC-V-specific files to all builds where $host_cpu is riscv ('riscv64')
@@ -16427,7 +16410,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.6.50.git, which was
+This file was extended by libpng $as_me 1.6.50, which was
 generated by GNU Autoconf 2.72.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -16495,7 +16478,7 @@ ac_cs_config_escaped=`printf "%s\n" "$ac_cs_config" | sed "s/^ //; s/'/'\\\\\\\\
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config='$ac_cs_config_escaped'
 ac_cs_version="\\
-libpng config.status 1.6.50.git
+libpng config.status 1.6.50
 configured by $0, generated by GNU Autoconf 2.72,
   with options \\"\$ac_cs_config\\"
 

configure.ac

@@ -25,7 +25,7 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.50.git],[png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng],[1.6.50],[png-mng-implement@lists.sourceforge.net])
 AC_CONFIG_MACRO_DIR([scripts/autoconf])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
@@ -46,7 +46,7 @@ dnl automake, so the following is not necessary (and is not defined anyway):
 dnl AM_PREREQ([1.11.2])
 dnl stop configure from automagically running automake
 
-PNGLIB_VERSION=1.6.50.git
+PNGLIB_VERSION=1.6.50
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=6
 PNGLIB_RELEASE=50

depcomp

@@ -1,7 +1,7 @@
 #! /bin/sh
 # depcomp - compile a program generating dependencies as side-effects
 
-scriptversion=2024-12-03.03; # UTC
+scriptversion=2025-06-18.21; # UTC
 
 # Copyright (C) 1999-2025 Free Software Foundation, Inc.
 
@@ -786,7 +786,7 @@ exit 0
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

install-sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 # install - install a program, script, or datafile
 
-scriptversion=2024-12-03.03; # UTC
+scriptversion=2025-06-18.21; # UTC
 
 # This originates from X11R5 (mit/util/scripts/install.sh), which was
 # later released in X11R6 (xc/config/util/install.sh) with the
@@ -535,7 +535,7 @@ done
 # Local variables:
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

libpng-manual.txt

@@ -9,7 +9,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng version 1.6.36, December 2018, through 1.6.49 - June 2025
+ libpng version 1.6.36, December 2018, through 1.6.50 - July 2025
  Updated and distributed by Cosmin Truta
  Copyright (c) 2018-2025 Cosmin Truta
 
@@ -65,18 +65,22 @@ 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

libpng.3

@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "June 12, 2025"
+.TH LIBPNG 3 "July 1, 2025"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.49
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.50
 
 .SH SYNOPSIS
 \fB#include <png.h>\fP
@@ -528,7 +528,7 @@ libpng-manual.txt - A description on how to use and modify libpng
 
  Based on:
 
- libpng version 1.6.36, December 2018, through 1.6.49 - June 2025
+ libpng version 1.6.36, December 2018, through 1.6.50 - July 2025
  Updated and distributed by Cosmin Truta
  Copyright (c) 2018-2025 Cosmin Truta
 
@@ -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

libpngpf.3

@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "June 12, 2025"
+.TH LIBPNGPF 3 "July 1, 2025"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.6.49
+libpng \- Portable Network Graphics (PNG) Reference Library 1.6.50
 
 .SH SYNOPSIS
 \fB#include "pngpriv.h"\fP

missing

@@ -1,7 +1,7 @@
 #! /bin/sh
 # Common wrapper for a few potentially missing GNU and other programs.
 
-scriptversion=2024-12-03.03; # UTC
+scriptversion=2025-06-18.21; # UTC
 
 # shellcheck disable=SC2006,SC2268 # we must support pre-POSIX shells
 
@@ -230,7 +230,7 @@ exit $st
 # Local variables:
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

png.5

@@ -1,4 +1,4 @@
-.TH PNG 5 "June 12, 2025"
+.TH PNG 5 "July 1, 2025"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 
@@ -20,20 +20,25 @@ matching on heterogeneous platforms.
 .SH "SEE ALSO"
 .BR "libpng"(3), " zlib"(3), " deflate"(5), " " and " zlib"(5)
 .LP
-PNG Specification (Third Edition) Proposed Recommendation, May 2025:
+PNG Specification (Third Edition), June 2025:
 .IP
 .br
-https://www.w3.org/TR/2025/PR-png-3-20250515/
+https://www.w3.org/TR/2025/REC-png-3-20250624/
 .LP
 PNG Specification (Second Edition), November 2003:
 .IP
 .br
 https://www.w3.org/TR/2003/REC-PNG-20031110/
 .LP
-PNG 1.2 Specification, July 1999:
+PNG 1.2 Specification, August 1999:
 .IP
 .br
-https://png-mng.sourceforge.io/pub/png/spec/1.2/
+https://www.libpng.org/pub/png/spec/1.2/
+.LP
+PNG 1.1 Specification, December 1998:
+.IP
+.br
+https://www.libpng.org/pub/png/spec/1.1/
 .LP
 PNG 1.0 Specification, October 1996:
 .IP
@@ -50,15 +55,24 @@ https://www.w3.org/TR/REC-png-961001
 .SH AUTHORS
 This man page: Glenn Randers-Pehrson, Cosmin Truta
 .LP
+Portable Network Graphics (PNG) Specification (Third Edition).
+W3C Recommendation 24 June 2025:
+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) (November 10, 2003): David Duce and others.
+ISO/IEC 15948:2003 (E), W3C Recommendation 10 November 2003:
+David Duce et al.
 .LP
-Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
-Glenn Randers-Pehrson and others.
+Portable Network Graphics (PNG) Specification Version 1.2 (11 August 1999):
+Glenn Randers-Pehrson et al.
 .LP
-Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
-Thomas Boutell and others.
+Portable Network Graphics (PNG) Specification Version 1.1 (31 December 1998):
+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.
 
 .\" end of man page

png.c

@@ -13,7 +13,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_50_git Your_png_h_is_not_version_1_6_50_git;
+typedef png_libpng_version_1_6_50 Your_png_h_is_not_version_1_6_50;
 
 /* Sanity check the chunks definitions - PNG_KNOWN_CHUNKS from pngpriv.h and the
  * corresponding macro definitions.  This causes a compile time failure if
@@ -815,7 +815,7 @@ png_get_copyright(png_const_structrp png_ptr)
    return PNG_STRING_COPYRIGHT
 #else
    return PNG_STRING_NEWLINE \
-      "libpng version 1.6.50.git" PNG_STRING_NEWLINE \
+      "libpng version 1.6.50" PNG_STRING_NEWLINE \
       "Copyright (c) 2018-2025 Cosmin Truta" PNG_STRING_NEWLINE \
       "Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson" \
       PNG_STRING_NEWLINE \

png.h

@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.6.50.git
+ * libpng version 1.6.50
  *
  * Copyright (c) 2018-2025 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
@@ -14,7 +14,7 @@
  *   libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
  *   libpng versions 0.97, January 1998, through 1.6.35, July 2018:
  *     Glenn Randers-Pehrson
- *   libpng versions 1.6.36, December 2018, through 1.6.49, June 2025:
+ *   libpng versions 1.6.36, December 2018, through 1.6.50, July 2025:
  *     Cosmin Truta
  *   See also "Contributing Authors", below.
  */
@@ -238,7 +238,7 @@
  *    ...
  *    1.5.30                  15    10530  15.so.15.30[.0]
  *    ...
- *    1.6.49                  16    10649  16.so.16.49[.0]
+ *    1.6.50                  16    10650  16.so.16.50[.0]
  *
  *    Henceforth the source version will match the shared-library major and
  *    minor numbers; the shared-library major version number will be used for
@@ -274,7 +274,7 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.6.50.git"
+#define PNG_LIBPNG_VER_STRING "1.6.50"
 #define PNG_HEADER_VERSION_STRING " libpng version " PNG_LIBPNG_VER_STRING "\n"
 
 /* The versions of shared library builds should stay in sync, going forward */
@@ -290,7 +290,7 @@
 /* This should be zero for a public release, or non-zero for a
  * development version.
  */
-#define PNG_LIBPNG_VER_BUILD 1
+#define PNG_LIBPNG_VER_BUILD 0
 
 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA               1
@@ -307,7 +307,7 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
 
 /* Careful here.  At one time, Guy wanted to use 082, but that
  * would be octal.  We must not include leading zeros.
@@ -316,7 +316,7 @@
  * From version 1.0.1 it is:
  * XXYYZZ, where XX=major, YY=minor, ZZ=release
  */
-#define PNG_LIBPNG_VER 10650 /* 1.6.50.git */
+#define PNG_LIBPNG_VER 10650 /* 1.6.50 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -426,7 +426,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_6_50_git;
+typedef char* png_libpng_version_1_6_50;
 
 /* Basic control structions.  Read libpng-manual.txt or libpng.3 for more info.
  *

pngconf.h

@@ -1,6 +1,6 @@
 /* pngconf.h - machine-configurable file for libpng
  *
- * libpng version 1.6.50.git
+ * libpng version 1.6.50
  *
  * Copyright (c) 2018-2025 Cosmin Truta
  * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson

pngtest.c

@@ -50,7 +50,7 @@
 #define STDERR stdout
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_6_50_git Your_png_h_is_not_version_1_6_50_git;
+typedef png_libpng_version_1_6_50 Your_png_h_is_not_version_1_6_50;
 
 /* Ensure that all version numbers in png.h are consistent with one another. */
 #if (PNG_LIBPNG_VER != PNG_LIBPNG_VER_MAJOR * 10000 + \

scripts/libpng-config-head.in

@@ -11,7 +11,7 @@
 
 # Modeled after libxml-config.
 
-version=1.6.50.git
+version=1.6.50
 prefix=""
 libdir=""
 libs=""

scripts/libpng.pc.in

@@ -5,6 +5,6 @@ includedir=@includedir@/libpng16
 
 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.6.50.git
+Version: 1.6.50
 Libs: -L${libdir} -lpng16
 Cflags: -I${includedir}

scripts/pnglibconf.h.prebuilt

@@ -1,6 +1,6 @@
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.6.50.git */
+/* libpng version 1.6.50 */
 
 /* Copyright (c) 2018-2025 Cosmin Truta */
 /* Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson */

test-driver

@@ -1,7 +1,7 @@
 #! /bin/sh
 # test-driver - basic testsuite driver script.
 
-scriptversion=2024-12-03.03; # UTC
+scriptversion=2025-06-18.21; # UTC
 
 # Copyright (C) 2011-2025 Free Software Foundation, Inc.
 #
@@ -154,7 +154,7 @@ echo ":copy-in-global-log: $gcopy" >> $trs_file
 # sh-indentation: 2
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
-# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End: