[libpng17] Imported from libpng-1.7.0beta88.tar

functions.

.appveyor.yml

@@ -1,81 +0,0 @@
-version: 1.6.x-{build}
-
-branches:
-  except:
-    - /libpng[0-1][0-8]/
-    - /v[0-1][.][0-8][.][0-9]+/
-
-image:
-  - Visual Studio 2022
-
-shallow_clone: true
-
-environment:
-  matrix:
-    - TOOLCHAIN: vstudio
-      AUTOMATION: cmake
-      ARCH: x86
-    - TOOLCHAIN: vstudio
-      AUTOMATION: cmake
-      ARCH: x64
-    - TOOLCHAIN: vstudio
-      AUTOMATION: cmake
-      ARCH: arm64
-    - TOOLCHAIN: llvm
-      AUTOMATION: cmake
-      ARCH: x64
-    - TOOLCHAIN: msys2
-      AUTOMATION: cmake
-      ARCH: i686
-    - TOOLCHAIN: msys2
-      AUTOMATION: cmake
-      ARCH: x86_64
-    - TOOLCHAIN: msys2
-      AUTOMATION: configure
-      ARCH: i686
-    - TOOLCHAIN: msys2
-      AUTOMATION: configure
-      ARCH: x86_64
-    - TOOLCHAIN: msys2
-      AUTOMATION: makefiles
-      ARCH: i686
-    - TOOLCHAIN: msys2
-      AUTOMATION: makefiles
-      ARCH: x86_64
-
-install:
-  - 'if "%TOOLCHAIN%"=="vstudio" C:\tools\vcpkg\vcpkg.exe install zlib:%ARCH%-windows'
-  - 'if "%TOOLCHAIN%"=="vstudio" C:\tools\vcpkg\vcpkg.exe integrate install'
-  - 'if "%TOOLCHAIN%"=="llvm" C:\tools\vcpkg\vcpkg.exe install zlib:%ARCH%-windows'
-  - 'if "%TOOLCHAIN%"=="llvm" C:\tools\vcpkg\vcpkg.exe integrate install'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%AUTOMATION%"=="cmake" C:\msys64\usr\bin\pacman.exe -S --noconfirm mingw-w64-%ARCH%-cmake mingw-w64-%ARCH%-ninja'
-
-before_build:
-  - 'if "%TOOLCHAIN%"=="vstudio" set CI_CMAKE_GENERATOR=Visual Studio 17 2022'
-  - 'if "%TOOLCHAIN%"=="vstudio" set CI_CMAKE_TOOLCHAIN_FILE=C:\tools\vcpkg\scripts\buildsystems\vcpkg.cmake'
-  - 'if "%TOOLCHAIN%"=="vstudio" if "%ARCH%"=="x86" set CI_CMAKE_GENERATOR_PLATFORM=Win32'
-  - 'if "%TOOLCHAIN%"=="vstudio" if "%ARCH%"=="x64" set CI_CMAKE_GENERATOR_PLATFORM=x64'
-  - 'if "%TOOLCHAIN%"=="vstudio" if "%ARCH%"=="arm64" set CI_CMAKE_GENERATOR_PLATFORM=ARM64'
-  - 'if "%TOOLCHAIN%"=="vstudio" if "%ARCH%"=="arm64" set CI_CMAKE_VARS=-DPNG_TESTS=0'
-  - 'if "%TOOLCHAIN%"=="llvm" set CI_CMAKE_GENERATOR=Ninja'
-  - 'if "%TOOLCHAIN%"=="llvm" set CI_CMAKE_TOOLCHAIN_FILE=C:\tools\vcpkg\scripts\buildsystems\vcpkg.cmake'
-  - 'if "%TOOLCHAIN%"=="llvm" set CI_CC=clang'
-  - 'if "%TOOLCHAIN%"=="msys2" set CI_CMAKE_GENERATOR=Ninja'
-  - 'if "%TOOLCHAIN%"=="msys2" set CI_CC=gcc'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%ARCH%"=="i686" set MSYSTEM=MINGW32'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%ARCH%"=="x86_64" set MSYSTEM=MINGW64'
-  - 'set CI_CMAKE_BUILD_FLAGS=-j2'
-  - 'set CI_CTEST_FLAGS=-j2'
-  - 'set CI_MAKE_FLAGS=-j2'
-  - 'set CI_MAKEFILES=scripts/makefile.gcc scripts/makefile.msys scripts/makefile.std'
-
-build_script:
-  - 'if "%TOOLCHAIN%"=="vstudio" C:\msys64\usr\bin\bash.exe -l "%APPVEYOR_BUILD_FOLDER%\ci\ci_verify_cmake.sh"'
-  - 'if "%TOOLCHAIN%"=="llvm" C:\msys64\usr\bin\bash.exe -l "%APPVEYOR_BUILD_FOLDER%\ci\ci_verify_cmake.sh"'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%AUTOMATION%"=="cmake" C:\msys64\usr\bin\bash.exe -l "%APPVEYOR_BUILD_FOLDER%\ci\ci_verify_cmake.sh"'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%AUTOMATION%"=="configure" C:\msys64\usr\bin\bash.exe -l "%APPVEYOR_BUILD_FOLDER%\ci\ci_verify_configure.sh"'
-  - 'if "%TOOLCHAIN%"=="msys2" if "%AUTOMATION%"=="makefiles" C:\msys64\usr\bin\bash.exe -l "%APPVEYOR_BUILD_FOLDER%\ci\ci_verify_makefiles.sh"'
-
-cache:
-  - 'C:\tools\vcpkg\installed'
-  - 'C:\msys64\var\cache\pacman'

.cmake-format.yaml

@@ -1,94 +0,0 @@
-# https://pypi.org/project/cmakelang
-# https://github.com/cheshirekow/cmake_format
-
-# ----------------------
-# Options for formatting
-# ----------------------
-
-# How wide to allow formatted cmake files
-# TODO: Reflow the CMake files to allow setting the maximum line width to 100.
-line_width: 255
-
-# How many spaces to tab for indent
-tab_size: 2
-
-# If true, lines are indented using tab characters (utf-8 0x09) instead of
-# <tab_size> space characters (utf-8 0x20). In cases where the layout would
-# require a fractional tab character, the behavior of the fractional
-# indentation is governed by <fractional_tab_policy>
-use_tabchars: false
-
-# If <use_tabchars> is True, then the value of this variable indicates how
-# fractional indentions are handled during whitespace replacement. If set to
-# 'use-space', fractional indentation is left as spaces (utf-8 0x20). If set
-# to `round-up` fractional indentation is replaced with a single tab character
-# (utf-8 0x09) effectively shifting the column to the next tabstop
-fractional_tab_policy: "use-space"
-
-# Enable comment markup parsing and reflow
-enable_markup: false
-
-# -------------------
-# Options for linting
-# -------------------
-
-# Lint codes to disable
-disabled_codes: [
-  # TODO:
-  # Reconcile the CMake variable names with the patterns below, then
-  # re-enable the "invalid variable name XXX" messages.
-  "C0103",
-
-  # TODO:
-  # Add brief COMMENT arguments to the `add_custom_target` commands.
-  "C0113",
-]
-
-# Regular expression pattern describing valid function names
-function_pattern: "[0-9a-z_]+"
-
-# Regular expression pattern describing valid macro names
-macro_pattern: "[0-9A-Z_]+"
-
-# Regular expression pattern describing valid names for variables with global
-# (cache) scope
-global_var_pattern: "[A-Z][0-9A-Z_]+"
-
-# Regular expression pattern describing valid names for variables with global
-# scope (but internal semantic)
-internal_var_pattern: "_[A-Z][0-9A-Z_]+"
-
-# Regular expression pattern describing valid names for variables with local
-# scope
-local_var_pattern: "[a-z][a-z0-9_]+"
-
-# Regular expression pattern describing valid names for privatedirectory
-# variables
-private_var_pattern: "_[0-9a-z_]+"
-
-# Regular expression pattern describing valid names for public directory
-# variables
-public_var_pattern: "[A-Z][0-9A-Z_]+"
-
-# Regular expression pattern describing valid names for function/macro
-# arguments and loop variables.
-argument_var_pattern: "[a-z][a-z0-9_]+"
-
-# Regular expression pattern describing valid names for keywords used in
-# functions or macros
-keyword_pattern: "[A-Z][0-9A-Z_]+"
-
-# In the heuristic for C0201, how many conditionals to match within a loop in
-# before considering the loop a parser
-max_conditionals_custom_parser: 2
-
-# Require at least this many newlines between statements;
-# require no more than this many newlines between statements;
-# etc.
-min_statement_spacing: 1
-max_statement_spacing: 2
-max_returns: 6
-max_branches: 12
-max_arguments: 5
-max_localvars: 15
-max_statements: 50

.editorconfig

@@ -1,55 +0,0 @@
-# https://editorconfig.org
-
-root = true
-
-[*]
-charset = utf-8
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-[*.txt]
-indent_size = unset
-indent_style = space
-
-[*.[chS]]
-indent_size = 3
-indent_style = space
-max_doc_length = 80
-max_line_length = 80
-
-[*.dfa]
-indent_size = 3
-indent_style = space
-max_doc_length = 80
-max_line_length = 80
-
-[*.awk]
-indent_size = 3
-indent_style = space
-max_doc_length = 80
-max_line_length = 100
-
-[*.cmake]
-indent_size = 2
-indent_style = space
-max_doc_length = 80
-max_line_length = 100
-
-[*.sh]
-indent_size = 4
-indent_style = space
-max_doc_length = 100
-max_line_length = 100
-
-[{Makefile.in,aclocal.m4,ltmain.sh}]
-indent_size = unset
-indent_style = unset
-insert_final_newline = unset
-max_doc_length = unset
-max_line_length = unset
-trim_trailing_whitespace = unset
-
-[COMMIT_EDITMSG]
-indent_style = space
-max_doc_length = unset
-max_line_length = 72

.editorconfig-checker.json

@@ -1,9 +0,0 @@
-{
-  "Disable": {
-    "IndentSize": true
-  },
-  "Exclude": [
-    ".git/",
-    "out/"
-  ]
-}

.github/workflows/lint.yml

@@ -1,31 +0,0 @@
-name: Linting libpng
-
-on:
-  push:
-    branches:
-      - libpng16
-      - libpng18
-  pull_request:
-    branches:
-      - libpng16
-      - libpng18
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    steps:
-      - name: Set up the cache
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/pip.txt') }}
-          restore-keys: ${{ runner.os }}-pip-
-      - name: Install yamllint
-        run: pip install yamllint
-      - name: Install editorconfig-checker
-        uses: editorconfig-checker/action-editorconfig-checker@main
-      - name: Check out the code
-        uses: actions/checkout@v4
-      - name: Run the linting script
-        run: bash ./ci/ci_lint.sh

.gitignore

@@ -1,159 +0,0 @@
-# Prerequisites
-*.d
-
-# Precompiled headers
-*.gch
-*.pch
-
-# Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Linker output files
-*.exp
-*.ilk
-*.map
-
-# Compiled dynamic libraries
-*.dll
-*.dylib
-*.so
-*.so.*
-
-# Compiled static libraries
-*.a
-*.la
-*.lai
-*.lib
-
-# Compiled executables
-*.app/
-*.exe
-a.out
-
-# Debug files
-*.dSYM/
-*.idb
-*.pdb
-*.su
-
-# Tag files
-TAGS
-.TAGS
-!TAGS/
-tags
-.tags
-!tags/
-gtags.files
-GTAGS
-GRTAGS
-GPATH
-GSYMS
-cscope.files
-cscope.out
-cscope.*.out
-
-# Text editing and text processing artifacts
-\#*\#
-.\#*
-[._]*.sw[a-p]
-[._]sw[a-p]
-*.bak
-*.orig
-*.rej
-*.tmp
-*~
-
-# IDE files and directories
-## Eclipse
-.cproject/
-.project/
-.settings/
-## Embarcadero RAD Studio
-*.cbproj.*
-__recovery/
-## JetBrains
-.idea/
-## NetBeans
-nbbuild/
-nbdist/
-nbproject/
-## Visual Studio
-.vs/
-### Visual Studio user files
-*.rsuser
-*.sln.docstates
-*.suo
-*.user
-*.userprefs
-### Visual Studio cache files (for older versions)
-*.aps
-*.ncb
-*.opensdf
-*.sdf
-*.VC.db
-*.VC.opendb
-ipch/
-## Visual Studio Code
-.vscode/*
-!.vscode/extensions.json
-!.vscode/launch.json
-!.vscode/settings.json
-!.vscode/tasks.json
-## (Various)
-*.*cache
-*.cache*
-[._]*_history
-.history/
-[Bb]ackup*/
-
-# Build, test and CI output directories
-*[Dd]ebug/
-[Dd]ebug*/
-*[Rr]elease/
-[Rr]elease*/
-[._]build*/
-/[Bb]uild*/
-/[Oo]ut/
-
-# Libpng configuration and auxiliary build artifacts
-*.out
-*out.png
-[._]deps/
-[._]libs/
-.dirstamp
-/Makefile
-/autom4te.cache/
-/config*~
-/config.h
-/config.log
-/config.status
-/install*~
-/libpng*-config
-/libpng*.pc
-/libpng.vers
-/libtool
-/stamp-h1
-CMake*.json
-!CMakePresets.json
-CMakeLists.txt.*
-pnglibconf.[ch]
-pnglibconf.dfn
-pnglibconf.pre
-pngprefix.h
-
-# Libpng test programs, scripts and artifacts
-/test-suite.log
-/tests/*.log
-/tests/*.trs
-/png-fix-itxt
-/pngcp
-/pngfix
-/pngimage
-/pngstest
-/pngtest
-/pngunknown
-/pngvalid
-/timepng

.travis.yml

@@ -0,0 +1,99 @@
+language: c
+sudo: false
+cache:
+    directories:
+        - $HOME/.cache/pip
+        - $HOME/deps
+matrix:
+    include:
+        - os: linux
+          compiler: gcc
+          env: BUILD_TYPE=normal
+        - os: linux
+          compiler: clang
+          env: BUILD_TYPE=normal
+        - os: linux
+          compiler: gcc
+          env: BUILD_TYPE=coverage
+        - os: linux
+          compiler: clang
+          env: BUILD_TYPE=ubsan
+        - os: linux
+          compiler: clang
+          env: BUILD_TYPE=asan
+        - os: linux
+          compiler: clang
+          env: BUILD_TYPE=lsan
+        - os: linux
+          compiler: clang
+          env: BUILD_TYPE=msan
+        - os: osx
+          compiler: gcc
+          env: BUILD_TYPE=normal
+        - os: osx
+          compiler: clang
+          env: BUILD_TYPE=normal
+
+install:
+    - pip install --user 'requests[security]'
+    - pip install --user cpp-coveralls
+    - |
+        mkdir -p deps
+        pushd deps
+        export PREFIXDIR=`pwd`
+        if [ ! -f "libtool-2.4.6.tar.xz" ]; then
+             wget http://ftpmirror.gnu.org/libtool/libtool-2.4.6.tar.xz
+        fi
+        if [ ! -f "automake-1.15.tar.xz" ]; then
+             wget http://ftp.gnu.org/gnu/automake/automake-1.15.tar.xz
+        fi
+        if [ ! -d "libtool-2.4.6" ]; then
+             tar xf libtool-2.4.6.tar.xz
+             pushd libtool-2.4.6/
+             ./configure --prefix=$PREFIXDIR
+             make && make install
+             popd
+             cp $PREFIXDIR/bin/libtool $PREFIXDIR/bin/glibtool
+             cp $PREFIXDIR/bin/libtoolize $PREFIXDIR/bin/glibtoolize
+        fi
+        if [ ! -d "automake-1.15" ]; then
+             tar xf automake-1.15.tar.xz
+             pushd automake-1.15/
+             ./configure --prefix=$PREFIXDIR
+             make && make install
+             popd
+        fi
+        export PATH="$PREFIXDIR/bin:$PATH"
+        popd
+before_script:
+    - |
+        if [ "$BUILD_TYPE" = "coverage" ]; then
+             export CFLAGS="-fprofile-arcs -ftest-coverage"
+             export LDFLAGS="-fprofile-arcs -ftest-coverage"
+        fi
+    - |
+         if [ "$BUILD_TYPE" = "asan" ]; then
+             export CFLAGS=-fsanitize=address
+             export LDFLAGS=-fsanitize=address
+         fi
+    - |
+         if [ "$BUILD_TYPE" = "lsan" ]; then
+             export CFLAGS=-fsanitize=leak
+             export LDFLAGS=-fsanitize=leak
+         fi
+    - |
+         if [ "$BUILD_TYPE" = "msan" ]; then
+             export CFLAGS=-fsanitize=memory
+             export LDFLAGS=-fsanitize=memory
+         fi
+    - |
+         if [ "$BUILD_TYPE" = "ubsan" ]; then
+             export CFLAGS="-fsanitize=undefined -fno-sanitize-recover"
+             export LDFLAGS="-fsanitize=undefined"
+         fi
+script:
+    - ./autogen.sh && ./configure && make && make check
+    - |
+          if [ "$BUILD_TYPE" = "coverage" ]; then
+              cpp-coveralls --gcov-options '\-lp'
+          fi

.yamllint.yml

@@ -1,7 +0,0 @@
-extends: default
-rules:
-  document-start: disable
-  document-end: disable
-  line-length: disable
-  truthy:
-    check-keys: false

AUTHORS

@@ -1,66 +0,0 @@
-PNG REFERENCE LIBRARY AUTHORS
-=============================
-
-This is the list of PNG Reference Library ("libpng") Contributing
-Authors, for copyright and licensing purposes.
-
- * Adam Richter
- * Andreas Dilger
- * Chris Blume
- * Cosmin Truta
- * Dave Martindale
- * Eric S. Raymond
- * Gilles Vollant
- * Glenn Randers-Pehrson
- * Greg Roelofs
- * Guy Eric Schalnat
- * James Yu
- * John Bowler
- * Kevin Bracey
- * Lucas Chollet
- * Magnus Holmgren
- * Mandar Sahastrabuddhe
- * Manfred Schlaegl
- * Mans Rullgard
- * Matt Sarett
- * Mike Klein
- * Pascal Massimino
- * Paul Schmidt
- * Philippe Antoine
- * Qiang Zhou
- * Sam Bushell
- * Samuel Williams
- * Simon-Pierre Cadieux
- * Tim Wegner
- * Tom Lane
- * Tom Tanner
- * Vadim Barkov
- * Willem van Schaik
- * Zhijie Liang
- * Apple Inc.
-    - Zixu Wang (王子旭)
- * Arm Holdings
-    - Richard Townsend
- * Google LLC
-    - Dan Field
-    - Dragoș Tiselice
-    - Leon Scroggins III
-    - Matt Sarett
-    - Mike Klein
-    - Sami Boukortt
-    - Wan-Teh Chang
- * Loongson Technology Corporation Ltd.
-    - GuXiWei (顾希伟)
-    - JinBo (金波)
-    - ZhangLixia (张利霞)
- * Samsung Group
-    - Filip Wasil
-
-The build projects, the build scripts, the test scripts, and other
-files in the "projects", "scripts" and "tests" directories, have
-other copyright owners, but are released under the libpng license.
-
-Some files in the "ci" and "contrib" directories, as well as some
-of the tools-generated files that are distributed with libpng, have
-other copyright owners, and are released under other open source
-licenses.

INSTALL

@@ -1,3 +1,4 @@
+
     Installing libpng
 
 Contents
@@ -15,11 +16,10 @@ Contents
       XI. Prepending a prefix to exported symbols
      XII. Configuring for compiler xxx:
     XIII. Removing unwanted object code
-     XIV. Enabling or disabling hardware optimizations
-      XV. Changes to the build and configuration of libpng in libpng-1.5.x
-     XVI. Setjmp/longjmp issues
-    XVII. Common linking failures
-   XVIII. Other sources of information about libpng
+     XIV. Changes to the build and configuration of libpng in libpng-1.5.x
+      XV. Setjmp/longjmp issues
+     XVI. Common linking failures
+    XVII. Other sources of information about libpng
 
 I. Simple installation
 
@@ -78,8 +78,8 @@ Or you can use one of the "projects" in the "projects" directory.
 
 Before installing libpng, you must first install zlib, if it
 is not already on your system.  zlib can usually be found
-wherever you got libpng; otherwise go to https://zlib.net/.  You can
-place zlib in the same directory as libpng or in another directory.
+wherever you got libpng; otherwise go to http://zlib.net.  You can place
+zlib in the same directory as libpng or in another directory.
 
 If your system already has a preinstalled zlib you will still need
 to have access to the zlib.h and zconf.h include files that
@@ -127,18 +127,16 @@ Your directory structure should look like this:
           README
           *.h, *.c  => libpng source files
           CMakeLists.txt    =>  "cmake" script
-          ci
-             ci_*.sh
           configuration files:
              configure.ac, configure, Makefile.am, Makefile.in,
              autogen.sh, config.guess, ltmain.sh, missing, libpng.pc.in,
              libpng-config.in, aclocal.m4, config.h.in, config.sub,
-             depcomp, install-sh, mkinstalldirs, test-pngtest.sh, etc.
+             depcomp, install-sh, mkinstalldirs, test-pngtest.sh
           contrib
              arm-neon, conftest, examples, gregbook, libtests, pngminim,
-             pngminus, pngsuite, tools, visupng, riscv-rvv
+             pngminus, pngsuite, tools, visupng
           projects
-             owatcom, visualc71, vstudio
+             cbuilder5, owatcom, visualc71, vstudio, xcode
           scripts
              makefile.*
              *.def (module definition files)
@@ -146,7 +144,7 @@ Your directory structure should look like this:
           pngtest.png
           etc.
       zlib
-          README, *.h, *.c, contrib, etc.
+          README, *.h, *.c contrib, etc.
 
 If the line endings in the files look funny, you may wish to get the other
 distribution of libpng.  It is available in both tar.gz (UNIX style line
@@ -154,27 +152,28 @@ endings) and zip (DOS style line endings) formats.
 
 VI. Building with project files
 
-If you are building libpng with Microsoft Visual Studio, you can enter
-the directory projects\visualc71 or projects\vstudio and follow the
-instructions in README.txt.
+If you are building libpng with MSVC, you can enter the
+libpng projects\visualc71 or vstudio directory and follow the instructions
+in README.txt.
 
-Otherwise, enter the zlib directory and follow the instructions in
-zlib/README, then come back here and run "configure" or choose the
-appropriate makefile in the scripts directory.
+Otherwise enter the zlib directory and follow the instructions in zlib/README,
+then come back here and run "configure" or choose the appropriate
+makefile.sys in the scripts directory.
 
 VII. Building with makefiles
 
 Copy the file (or files) that you need from the
 scripts directory into this directory, for example
 
+MSDOS example:
+
+    copy scripts\makefile.msc makefile
+    copy scripts\pnglibconf.h.prebuilt pnglibconf.h
+
 UNIX example:
 
-    cp scripts/makefile.std Makefile
-    make
-
-Windows example:
-
-    nmake -f scripts\makefile.vcwin32
+    cp scripts/makefile.std makefile
+    cp scripts/pnglibconf.h.prebuilt pnglibconf.h
 
 Read the makefile to see if you need to change any source or
 target directories to match your preferences.
@@ -191,33 +190,36 @@ test.  For more confidence, you can run another test by typing
 Also, you can run "pngtest -m contrib/pngsuite/*.png" and compare
 your output with the result shown in contrib/pngsuite/README.
 
-Most of the makefiles used to allow you to run "make install" to put
-the library in its final resting place, but that feature is no longer
-supported.  The only tested and supported manners to install libpng are
-the conventional build and install procedures driven by the configure
-script or by the CMake file.
+Most of the makefiles will allow you to run "make install" to
+put the library in its final resting place (if you want to
+do that, run "make install" in the zlib directory first if necessary).
+Some also allow you to run "make test-installed" after you have
+run "make install".
 
-VIII. Configuring for DOS and other 16-bit platforms
+VIII. Configuring libpng for 16-bit platforms
 
-Officially, the support for 16-bit platforms has been removed.
+You will want to look into zconf.h to tell zlib (and thus libpng) that
+it cannot allocate more than 64K at a time.  Even if you can, the memory
+won't be accessible.  So limit zlib and libpng to 64K by defining MAXSEG_64K.
+
+IX. Configuring for DOS
 
 For DOS users who only have access to the lower 640K, you will
 have to limit zlib's memory usage via a png_set_compression_mem_level()
 call.  See zlib.h or zconf.h in the zlib library for more information.
 
-You may be or may not be in luck if you target the "large" memory model,
-but all the smaller models ("small", "compact" and "medium") are known
-to be unworkable.  For DOS users who have access beyond the lower 640K,
-a "flat" 32-bit DOS model (such as DJGPP) is strongly recommended.
+X. Configuring for Medium Model
 
-For DOS users who only have access to the lower 640K, you will have to
-limit zlib's memory usage via a png_set_compression_mem_level() call.
-You will also have to look into zconf.h to tell zlib (and thus libpng)
-that it cannot allocate more than 64K at a time.  Even if you can, the
-memory won't be accessible.  Therefore, you should limit zlib and libpng
-to 64K by defining MAXSEG_64K.
+Libpng's support for medium model has been tested on most of the popular
+compilers.  Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
+defined, and FAR gets defined to far in pngconf.h, and you should be
+all set.  Everything in the library (except for zlib's structure) is
+expecting far data.  You must use the typedefs with the p or pp on
+the end for pointers (or at least look at them and be careful).  Make
+note that the rows of data are defined as png_bytepp, which is
+an "unsigned char far * far *".
 
-IX. Prepending a prefix to exported symbols
+XI. Prepending a prefix to exported symbols
 
 Starting with libpng-1.6.0, you can configure libpng (when using the
 "configure" script) to prefix all exported symbols by means of the
@@ -228,7 +230,7 @@ identifier).  This creates a set of macros in pnglibconf.h, so this is
 transparent to applications; their function calls get transformed by
 the macros to use the modified names.
 
-X. Configuring for compiler xxx:
+XII. Configuring for compiler xxx:
 
 All includes for libpng are in pngconf.h.  If you need to add, change
 or delete an include, this is the place to do it.
@@ -238,9 +240,10 @@ The files in libpng proper only include pngpriv.h and png.h, which
 in turn includes pngconf.h and, as of libpng-1.5.0, pnglibconf.h.
 As of libpng-1.5.0, pngpriv.h also includes three other private header
 files, pngstruct.h, pnginfo.h, and pngdebug.h, which contain material
-that previously appeared in the public headers.
+that previously appeared in the public headers. As of libpng-1.7.0,
+pngchunk.h is also included, and is used privately by pngrutil.c.
 
-XI. Removing unwanted object code
+XIII. Removing unwanted object code
 
 There are a bunch of #define's in pngconf.h that control what parts of
 libpng are compiled.  All the defines end in _SUPPORTED.  If you are
@@ -279,61 +282,7 @@ library to fail if they call functions not available in your library.
 The size of the library itself should not be an issue, because only
 those sections that are actually used will be loaded into memory.
 
-XII. Enabling or disabling hardware optimizations
-
-Certain hardware capabilities, such as the Intel SSE instructions,
-are normally detected at run time. Enable them with configure options
-such as one of
-
-   --enable-arm-neon=yes
-   --enable-mips-msa=yes
-   --enable-intel-sse=yes
-   --enable-powerpc-vsx=yes
-   --enable-riscv-rvv=yes
-
-or enable them all at once with
-
-   --enable-hardware-optimizations=yes
-
-or, if you are not using "configure", you can use one
-or more of
-
-   CPPFLAGS += "-DPNG_ARM_NEON"
-   CPPFLAGS += "-DPNG_MIPS_MSA"
-   CPPFLAGS += "-DPNG_INTEL_SSE"
-   CPPFLAGS += "-DPNG_POWERPC_VSX"
-   CPPFLAGS += "-DPNG_RISCV_RVV"
-
-See for example scripts/makefile.linux-opt
-
-If you wish to avoid using them,
-you can disable them via the configure option
-
-   --disable-hardware-optimizations
-
-to disable them all, or
-
-   --enable-intel-sse=no
-
-to disable a particular one,
-or via compiler-command options such as
-
-   CPPFLAGS += "-DPNG_ARM_NEON_OPT=0, -DPNG_MIPS_MSA_OPT=0,
-   -DPNG_INTEL_SSE_OPT=0, -DPNG_POWERPC_VSX_OPT=0,
-   -DPNG_RISCV_RVV_OPT=0"
-
-If you are using cmake, hardware optimizations are "on"
-by default. To disable them, use
-
-    cmake . -DPNG_ARM_NEON=no -DPNG_INTEL_SSE=no \
-            -DPNG_MIPS_MSA=no -DPNG_POWERPC_VSX=no \
-            -DPNG_RISCV_RVV=no
-
-or disable them all at once with
-
-    cmake . -DPNG_HARDWARE_OPTIMIZATIONS=no
-
-XIII. Changes to the build and configuration of libpng in libpng-1.5.x
+XIV. Changes to the build and configuration of libpng in libpng-1.5.x
 
 Details of internal changes to the library code can be found in the CHANGES
 file and in the GIT repository logs.  These will be of no concern to the vast
@@ -424,7 +373,7 @@ $PREFIX/include directory).  Do not edit pnglibconf.h after you have built
 libpng, because than the settings would not accurately reflect the settings
 that were used to build libpng.
 
-XIV. Setjmp/longjmp issues
+XV. Setjmp/longjmp issues
 
 Libpng uses setjmp()/longjmp() for error handling.  Unfortunately setjmp()
 is known to be not thread-safe on some platforms and we don't know of
@@ -442,7 +391,7 @@ This requires setjmp/longjmp, so you must either build the library
 with PNG_SETJMP_SUPPORTED defined, or with PNG_SIMPLIFIED_READ_SUPPORTED
 and PNG_SIMPLIFIED_WRITE_SUPPORTED undefined.
 
-XV. Common linking failures
+XVI. Common linking failures
 
 If your application fails to find libpng or zlib entries while linking:
 
@@ -454,13 +403,12 @@ If your application fails to find libpng or zlib entries while linking:
   If you are using the vstudio project, observe the WARNING in
   project/vstudio/README.txt.
 
-XVI. Other sources of information about libpng:
+XVII. Other sources of information about libpng:
 
 Further information can be found in the README and libpng-manual.txt
 files, in the individual makefiles, in png.h, and the manual pages
 libpng.3 and png.5.
 
-Copyright (c) 2022 Cosmin Truta
 Copyright (c) 1998-2002,2006-2016 Glenn Randers-Pehrson
 This document is released under the libpng license.
 For conditions of distribution and use, see the disclaimer

LICENSE

@@ -1,46 +1,17 @@
-COPYRIGHT NOTICE, DISCLAIMER, and LICENSE
-=========================================
 
-PNG Reference Library License version 2
----------------------------------------
+This copy of the libpng notices is provided for your convenience.  In case of
+any discrepancy between this copy and the notices in the file png.h that is
+included in the libpng distribution, the latter shall prevail.
 
- * Copyright (c) 1995-2025 The PNG Reference Library Authors.
- * Copyright (c) 2018-2025 Cosmin Truta.
- * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.
- * Copyright (c) 1996-1997 Andreas Dilger.
- * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
+COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 
-The software is supplied "as is", without warranty of any kind,
-express or implied, including, without limitation, the warranties
-of merchantability, fitness for a particular purpose, title, and
-non-infringement.  In no event shall the Copyright owners, or
-anyone distributing the software, be liable for any damages or
-other liability, whether in contract, tort or otherwise, arising
-from, out of, or in connection with the software, or the use or
-other dealings in the software, even if advised of the possibility
-of such damage.
+If you modify libpng you may insert additional notices immediately following
+this sentence.
 
-Permission is hereby granted to use, copy, modify, and distribute
-this software, or portions hereof, for any purpose, without fee,
-subject to the following restrictions:
+This code is released under the libpng license.
 
- 1. The origin of this software must not be misrepresented; you
-    must not claim that you wrote the original software.  If you
-    use this software in a product, an acknowledgment in the product
-    documentation would be appreciated, but is not required.
-
- 2. Altered source versions must be plainly marked as such, and must
-    not be misrepresented as being the original software.
-
- 3. This Copyright notice may not be removed or altered from any
-    source or altered source distribution.
-
-
-PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)
------------------------------------------------------------------------
-
-libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are
-Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are
+libpng versions 1.0.7, July 1, 2000 through 1.7.0beta88, August 6, 2017 are
+Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are
 derived from libpng-1.0.6, and are distributed according to the same
 disclaimer and license as libpng-1.0.6 with the following individuals
 added to the list of Contributing Authors:
@@ -51,28 +22,25 @@ added to the list of Contributing Authors:
    Cosmin Truta
    Gilles Vollant
    James Yu
-    Mandar Sahastrabuddhe
-    Google Inc.
-    Vadim Barkov
 
 and with the following additions to the disclaimer:
 
-    There is no warranty against interference with your enjoyment of
-    the library or against infringement.  There is no warranty that our
+   There is no warranty against interference with your enjoyment of the
+   library or against infringement.  There is no warranty that our
    efforts or the library will fulfill any of your particular purposes
    or needs.  This library is provided with all faults, and the entire
-    risk of satisfactory quality, performance, accuracy, and effort is
-    with the user.
+   risk of satisfactory quality, performance, accuracy, and effort is with
+   the user.
 
 Some files in the "contrib" directory and some configure-generated
-files that are distributed with libpng have other copyright owners, and
+files that are distributed with libpng have other copyright owners and
 are released under other open source licenses.
 
 libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
 libpng-0.96, and are distributed according to the same disclaimer and
-license as libpng-0.96, with the following individuals added to the
-list of Contributing Authors:
+license as libpng-0.96, with the following individuals added to the list
+of Contributing Authors:
 
    Tom Lane
    Glenn Randers-Pehrson
@@ -91,7 +59,7 @@ Contributing Authors:
    Greg Roelofs
    Tom Tanner
 
-Some files in the "scripts" directory have other copyright owners,
+Some files in the "scripts" directory have other copyright owners
 but are released under this license.
 
 libpng versions 0.5, May 1995, through 0.88, January 1996, are
@@ -106,14 +74,13 @@ is defined as the following set of individuals:
    Paul Schmidt
    Tim Wegner
 
-The PNG Reference Library is supplied "AS IS".  The Contributing
-Authors and Group 42, Inc. disclaim all warranties, expressed or
-implied, including, without limitation, the warranties of
-merchantability and of fitness for any purpose.  The Contributing
-Authors and Group 42, Inc. assume no liability for direct, indirect,
-incidental, special, exemplary, or consequential damages, which may
-result from the use of the PNG Reference Library, even if advised of
-the possibility of such damage.
+The PNG Reference Library is supplied "AS IS".  The Contributing Authors
+and Group 42, Inc. disclaim all warranties, expressed or implied,
+including, without limitation, the warranties of merchantability and of
+fitness for any purpose.  The Contributing Authors and Group 42, Inc.
+assume no liability for direct, indirect, incidental, special, exemplary,
+or consequential damages, which may result from the use of the PNG
+Reference Library, even if advised of the possibility of such damage.
 
 Permission is hereby granted to use, copy, modify, and distribute this
 source code, or portions hereof, for any purpose, without fee, subject
@@ -127,8 +94,37 @@ to the following restrictions:
   3. This Copyright notice may not be removed or altered from any
      source or altered source distribution.
 
-The Contributing Authors and Group 42, Inc. specifically permit,
-without fee, and encourage the use of this source code as a component
-to supporting the PNG file format in commercial products.  If you use
-this source code in a product, acknowledgment is not required but would
-be appreciated.
+The Contributing Authors and Group 42, Inc. specifically permit, without
+fee, and encourage the use of this source code as a component to
+supporting the PNG file format in commercial products.  If you use this
+source code in a product, acknowledgment is not required but would be
+appreciated.
+
+END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
+
+TRADEMARK:
+
+The name "libpng" has not been registered by the Copyright owner
+as a trademark in any jurisdiction.  However, because libpng has
+been distributed and maintained world-wide, continually since 1995,
+the Copyright owner claims "common-law trademark protection" in any
+jurisdiction where common-law trademark is recognized.
+
+OSI CERTIFICATION:
+
+Libpng is OSI Certified Open Source Software.  OSI Certified Open Source is
+a certification mark of the Open Source Initiative. OSI has not addressed
+the additional disclaimers inserted at version 1.0.7.
+
+EXPORT CONTROL:
+
+The Copyright owner believes that the Export Control Classification
+Number (ECCN) for libpng is EAR99, which means not subject to export
+controls or International Traffic in Arms Regulations (ITAR) because
+it is open source, publicly available software, that does not contain
+any encryption software.  See the EAR, paragraphs 734.3(b)(3) and
+734.7(b).
+
+Glenn Randers-Pehrson
+glennrp at users.sourceforge.net
+August 6, 2017

Makefile.am

@@ -1,7 +1,7 @@
 # Makefile.am, the source file for Makefile.in (and hence Makefile), is
 #
-# Copyright (c) 2018-2025 Cosmin Truta
 # Copyright (c) 2004-2016 Glenn Randers-Pehrson
+# Last changed in libpng 1.7.0 [(PENDING RELEASE)]
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
@@ -9,24 +9,16 @@
 
 PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@
 
-ACLOCAL_AMFLAGS = -I scripts/autoconf
+ACLOCAL_AMFLAGS = -I scripts
 
 # test programs - run on make check, make distcheck
-if ENABLE_TESTS
 check_PROGRAMS= pngtest pngunknown pngstest pngvalid pngimage pngcp 
 if HAVE_CLOCK_GETTIME
 check_PROGRAMS += timepng
 endif
-else
-check_PROGRAMS=
-endif
 
 # Utilities - installed
-if ENABLE_TOOLS
 bin_PROGRAMS= pngfix png-fix-itxt
-else
-bin_PROGRAMS=
-endif
 
 # This ensures that pnglibconf.h gets built at the start of 'make all' or
 # 'make check', but it does not add dependencies to the individual programs,
@@ -38,7 +30,6 @@ endif
 # always wrong and always very confusing.
 BUILT_SOURCES = pnglibconf.h
 
-if ENABLE_TESTS
 pngtest_SOURCES = pngtest.c
 pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
@@ -54,33 +45,29 @@ pngunknown_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 pngimage_SOURCES = contrib/libtests/pngimage.c
 pngimage_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
+pngfix_SOURCES = contrib/tools/pngfix.c
+pngfix_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
+
+png_fix_itxt_SOURCES = contrib/tools/png-fix-itxt.c
+
 timepng_SOURCES = contrib/libtests/timepng.c
 timepng_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 
 pngcp_SOURCES = contrib/tools/pngcp.c
 pngcp_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-endif
-
-if ENABLE_TOOLS
-pngfix_SOURCES = contrib/tools/pngfix.c
-pngfix_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
-
-png_fix_itxt_SOURCES = contrib/tools/png-fix-itxt.c
-endif
 
 # Generally these are single line shell scripts to run a test with a particular
 # set of parameters:
-if ENABLE_TESTS
 TESTS =\
-   tests/pngtest-all\
+   tests/pngtest\
    tests/pngvalid-gamma-16-to-8 tests/pngvalid-gamma-alpha-mode\
    tests/pngvalid-gamma-background tests/pngvalid-gamma-expand16-alpha-mode\
    tests/pngvalid-gamma-expand16-background\
    tests/pngvalid-gamma-expand16-transform tests/pngvalid-gamma-sbit\
    tests/pngvalid-gamma-threshold tests/pngvalid-gamma-transform\
-   tests/pngvalid-progressive-size\
+   tests/pngvalid-progressive-size tests/pngvalid-size\
    tests/pngvalid-progressive-interlace-standard\
-   tests/pngvalid-transform\
+   tests/pngvalid-transform tests/pngvalid-interlace-transform\
    tests/pngvalid-progressive-standard tests/pngvalid-standard\
    tests/pngstest-1.8 tests/pngstest-1.8-alpha tests/pngstest-linear\
    tests/pngstest-linear-alpha tests/pngstest-none tests/pngstest-none-alpha\
@@ -88,7 +75,6 @@ TESTS =\
    tests/pngunknown-discard tests/pngunknown-if-safe tests/pngunknown-sAPI\
    tests/pngunknown-sTER tests/pngunknown-save tests/pngunknown-vpAg\
    tests/pngimage-quick tests/pngimage-full
-endif
 
 # man pages
 dist_man_MANS= libpng.3 libpngpf.3 png.5
@@ -104,50 +90,15 @@ lib_LTLIBRARIES=libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
 	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
 	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
-	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngusr.dfa
+	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h pngchunk.h \
+	pngusr.dfa
 
-if PNG_ARM_NEON
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/arm_init.c\
-	arm/filter_neon_intrinsics.c \
-	arm/palette_neon_intrinsics.c
-endif
-
-if PNG_MIPS_MSA
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += mips/mips_init.c\
-	mips/filter_msa_intrinsics.c
-endif
-
-if PNG_MIPS_MMI
-if !PNG_MIPS_MSA
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += mips/mips_init.c
-endif
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += mips/filter_mmi_inline_assembly.c
-endif
-
-if PNG_INTEL_SSE
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += intel/intel_init.c\
-	intel/filter_sse2_intrinsics.c
-endif
-
-if PNG_POWERPC_VSX
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += powerpc/powerpc_init.c\
-        powerpc/filter_vsx_intrinsics.c
-endif
-
-if PNG_RISCV_RVV
-noinst_LTLIBRARIES= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@rvv.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@rvv_la_SOURCES = riscv/riscv_init.c\
-        riscv/filter_rvv_intrinsics.c
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@rvv_la_CFLAGS = -march=rv64gv
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LIBADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@rvv.la
-endif
-
-if PNG_LOONGARCH_LSX
-noinst_LTLIBRARIES= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@lsx.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@lsx_la_SOURCES = loongarch/loongarch_lsx_init.c\
-	loongarch/filter_lsx_intrinsics.c
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@lsx_la_CFLAGS = -mlsx
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LIBADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@lsx.la
+# Include libpng extensions, if appropriate.  This uses a Makefile.am fragment,
+# pre-set things that might be changed by addition:
+AM_CPPFLAGS =
+DFA_EXTENSION = 
+if LIBPNG_EXTENSIONS
+include $(top_srcdir)/contrib/extensions.am
 endif
 
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
@@ -170,14 +121,6 @@ else
   libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
 endif
 
-if PNG_RISCV_RVV
-  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES += libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@rvv.la
-endif
-
-if PNG_LOONGARCH_LSX
-  libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES += libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@lsx.la
-endif
-
 #distribute headers in /usr/include/libpng/*
 pkgincludedir= $(includedir)/$(PNGLIB_BASENAME)
 pkginclude_HEADERS= png.h pngconf.h
@@ -192,31 +135,31 @@ pkgconfig_DATA = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc
 # from those directories being included.  This only works if the configure is
 # not done in the source directory!
 EXTRA_DIST= \
-	ANNOUNCE AUTHORS CHANGES INSTALL LICENSE README TODO TRADEMARK \
+	ANNOUNCE CHANGES INSTALL LICENSE README TODO \
 	pngtest.png pngbar.png pngnow.png pngbar.jpg autogen.sh \
-	${srcdir}/ci ${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
+	${srcdir}/contrib ${srcdir}/projects ${srcdir}/scripts \
 	$(TESTS) $(XFAIL_TESTS) tests/pngstest \
 	CMakeLists.txt example.c libpng-manual.txt
 
-SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk
+SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk scripts/pnglibconf.c
 
 CLEANFILES= *.tf? pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \
 	check.new pnglibconf.h pngprefix.h symbols.new pngtest-log.txt \
-	pnglibconf.out pnglibconf.c pnglibconf.pre pnglibconf.dfn \
+	pnglibconf.out pnglibconf.c pnglibconf.dfn pnglibconf.pre \
 	$(SCRIPT_CLEANFILES)
 
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing
 
 # PNG_COPTS give extra options for the C compiler to be used on all compilation
-# steps (unless target_CFLAGS is specified; that will take precedence over
+# steps (unless targe_CFLAGS is specified; that will take precedence over
 # AM_CFLAGS)
 PNG_COPTS = @PNG_COPTS@
 AM_CFLAGS = ${PNG_COPTS}
 
-# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
-# other operating systems (NeXT?) the C preprocessor selected by configure
+# DFNCPP is normally just "CPP -E" - the C preprocessor - but on Solaris and
+# maybe other operating systems (NeXT?) the C preprocessor selected by configure
 # checks input tokens for validity - effectively it performs part of the ANSI-C
 # parsing - and therefore fails with the .df files.  configure.ac has special
 # checks for this and sets DFNCPP appropriately.
@@ -235,6 +178,8 @@ scripts/prefix.out: png.h pngconf.h pnglibconf.out
 scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt
 scripts/intprefix.out: pnglibconf.h
 
+pnglibconf.out: config.h
+
 libpng.sym: scripts/sym.out
 	rm -f $@
 	cp $? $@
@@ -246,7 +191,7 @@ if DO_PNG_PREFIX
 # Rename functions in scripts/prefix.out with a PNG_PREFIX prefix.
 # Rename macros in scripts/macro.lst from PNG_PREFIXpng_ to PNG_ (the actual
 # implementation of the macro).
-pnglibconf.h: pnglibconf.out scripts/prefix.out scripts/macro.lst
+pnglibconf.h: pnglibconf.out scripts/prefix.out scripts/macro.lst config.h
 	rm -f $@
 	$(AWK) 's==0 && NR>1{print prev}\
 	   s==0{prev=$$0}\
@@ -312,17 +257,17 @@ endif
 	rm -f $@ $*.tf[12]
 	test -d scripts || mkdir scripts || test -d scripts
 	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES)\
-	    $(CPPFLAGS) $(SYMBOL_CFLAGS) $< > $*.tf1
+	    $(AM_CPPFLAGS) $(CPPFLAGS) $(SYMBOL_CFLAGS) $< > $*.tf1
 	$(AWK) -f "${srcdir}/scripts/dfn.awk" out="$*.tf2" $*.tf1 1>&2
 	rm -f $*.tf1
 	mv $*.tf2 $@
 
 # The .c file for pnglibconf.h is machine generated
-pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA)
+pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_EXTENSION) $(DFA_XTRA)
 	rm -f $@ $*.tf[45]
 	$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf4 version=search\
 	    ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
-	    ${srcdir}/pngusr.dfa $(DFA_XTRA) 1>&2
+	    $(DFA_EXTENSION) ${srcdir}/pngusr.dfa $(DFA_XTRA) 1>&2
 	$(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf5 $*.tf4 1>&2
 	rm $*.tf4
 	mv $*.tf5 $@
@@ -340,8 +285,9 @@ scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.ou
 # be empty - no non-standard defines
 scripts/pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm -f $@ pnglibconf.tf[67]
-	test -z "$(CPPFLAGS)"
-	echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\
+	test -z "$(CPPFLAGS)" -a -z "$(AM_CPPFLAGS)"
+	(echo "com libpng @PNGLIB_VERSION@ STANDARD API DEFINITION";\
+	 echo "com") |\
 	$(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf6\
 	    logunsupported=1 version=search ${srcdir}/pngconf.h -\
 	    ${srcdir}/scripts/pnglibconf.dfa 1>&2
@@ -350,7 +296,7 @@ scripts/pnglibconf.c: scripts/pnglibconf.dfa scripts/options.awk pngconf.h
 	rm pnglibconf.tf6
 	mv pnglibconf.tf7 $@
 
-$(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \
+$(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h pngchunk.h \
 	pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h pngprefix.h
 
 test: check-am

README

@@ -1,88 +1,56 @@
-README for libpng version 1.6.51.git
-====================================
+README for libpng version 1.7.0beta88 - August 6, 2017 (shared library 17.0)
+See the note about version numbers near the top of png.h
 
-See the note about version numbers near the top of `png.h`.
-See `INSTALL` for instructions on how to install libpng.
+See INSTALL for instructions on how to install libpng.
 
-Libpng comes in several distribution formats.  Get `libpng-*.tar.gz`
-or `libpng-*.tar.xz` if you want UNIX-style line endings in the text
-files, or `lpng*.7z` or `lpng*.zip` if you want DOS-style line endings.
+Libpng comes in several distribution formats.  Get libpng-*.tar.gz or
+libpng-*.tar.xz or if you want UNIX-style line endings in the text files,
+or lpng*.7z or lpng*.zip if you want DOS-style line endings.
 
-For a detailed description on using libpng, read `libpng-manual.txt`.
-For examples of libpng in a program, see `example.c` and `pngtest.c`.
-For usage information and restrictions (what little they are) on libpng,
-see `png.h`.  For a description on using zlib (the compression library
-used by libpng) and zlib's restrictions, see `zlib.h`.
+Version 0.89 was the first official release of libpng.  Don't let the
+fact that it's the first release fool you.  The libpng library has been in
+extensive use and testing since mid-1995.  By late 1997 it had
+finally gotten to the stage where there hadn't been significant
+changes to the API in some time, and people have a bad feeling about
+libraries with versions < 1.0.  Version 1.0.0 was released in
+March 1998.
 
-You should use zlib 1.0.4 or later to run this, but it _may_ work with
-versions as old as zlib 0.95.  Even so, there are bugs in older zlib
-versions which can cause the output of invalid compression streams for
-some images.
-
-You should also note that zlib is a compression library that is useful
-for more things than just PNG files.  You can use zlib as a drop-in
-replacement for `fread()` and `fwrite()`, if you are so inclined.
-
-zlib should be available at the same place that libpng is, or at
-https://zlib.net .
-
-You may also want a copy of the PNG specification.  It is available
-as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
-these at http://www.libpng.org/pub/png/pngdocs.html .
-
-This code is currently being archived at https://libpng.sourceforge.io
-in the download area, and at http://libpng.download/src .
-
-This release, based in a large way on Glenn's, Guy's and Andreas'
-earlier work, was created and will be supported by myself and the PNG
-development group.
-
-Send comments, corrections and commendations to `png-mng-implement`
-at `lists.sourceforge.net`.  (Subscription is required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
-to subscribe.)
-
-Send general questions about the PNG specification to `png-mng-misc`
-at `lists.sourceforge.net`.  (Subscription is required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-misc
-to subscribe.)
-
-Historical notes
-----------------
-
-The libpng library has been in extensive use and testing since mid-1995.
-Version 0.89, published a year later, was the first official release.
-By late 1997, it had finally gotten to the stage where there hadn't
-been significant changes to the API in some time, and people have a bad
-feeling about libraries with versions below 1.0.  Version 1.0.0 was
-released in March 1998.
-
-Note that some of the changes to the `png_info` structure render this
+****
+Note that some of the changes to the png_info structure render this
 version of the library binary incompatible with libpng-0.89 or
 earlier versions if you are using a shared library.  The type of the
-`filler` parameter for `png_set_filler()` has changed from `png_byte`
-to `png_uint_32`, which will affect shared-library applications that
-use this function.
+"filler" parameter for png_set_filler() has changed from png_byte to
+png_uint_32, which will affect shared-library applications that use
+this function.
 
-To avoid problems with changes to the internals of the `info_struct`,
+To avoid problems with changes to the internals of the png info_struct,
 new APIs have been made available in 0.95 to avoid direct application
-access to `info_ptr`.  These functions are the `png_set_<chunk>` and
-`png_get_<chunk>` functions.  These functions should be used when
-accessing/storing the `info_struct` data, rather than manipulating it
+access to info_ptr.  These functions are the png_set_<chunk> and
+png_get_<chunk> functions.  These functions should be used when
+accessing/storing the info_struct data, rather than manipulating it
 directly, to avoid such problems in the future.
 
 It is important to note that the APIs did not make current programs
 that access the info struct directly incompatible with the new
 library, through libpng-1.2.x.  In libpng-1.4.x, which was meant to
-be a transitional release, members of the `png_struct` and the
-`info_struct` can still be accessed, but the compiler will issue a
+be a transitional release, members of the png_struct and the
+info_struct can still be accessed, but the compiler will issue a
 warning about deprecated usage.  Since libpng-1.5.0, direct access
 to these structs is not allowed, and the definitions of the structs
-reside in private `pngstruct.h` and `pnginfo.h` header files that are
-not accessible to applications.  It is strongly suggested that new
-programs use the new APIs (as shown in `example.c` and `pngtest.c`),
-and older programs be converted to the new format, to facilitate
-upgrades in the future.
+reside in private pngstruct.h and pnginfo.h header files that are not
+accessible to applications.  It is strongly suggested that new
+programs use the new APIs (as shown in example.c and pngtest.c), and
+older programs be converted to the new format, to facilitate upgrades
+in the future.
+****
+
+Additions since 0.90 include the ability to compile libpng as a
+Windows DLL, and new APIs for accessing data in the info struct.
+Experimental functions include the ability to set weighting and cost
+factors for row filter selection, direct reads of integers from buffers
+on big-endian processors that support misaligned data access, faster
+methods of doing alpha composition, and more accurate 16->8 bit color
+conversion.
 
 The additions since 0.89 include the ability to read from a PNG stream
 which has had some (or all) of the signature bytes read by the calling
@@ -92,31 +60,99 @@ the library action on the detection of chunk CRC errors.  It is possible
 to set different actions based on whether the CRC error occurred in a
 critical or an ancillary chunk.
 
-The additions since 0.90 include the ability to compile libpng as a
-Windows DLL, and new APIs for accessing data in the `info_struct`.
-Experimental functions included the ability to set weighting and cost
-factors for row filter selection, direct reads of integers from buffers
-on big-endian processors that support misaligned data access, faster
-methods of doing alpha composition, and more accurate 16-to-8 bit color
-conversion.  Some of these experimental functions, such as the weighted
-filter heuristics, have since been removed.
+The changes made to the library, and bugs fixed are based on discussions
+on the PNG-implement mailing list and not on material submitted
+privately to Guy, Andreas, or Glenn.  They will forward any good
+suggestions to the list.
 
-Files included in this distribution
------------------------------------
+For a detailed description on using libpng, read libpng-manual.txt.  For
+examples of libpng in a program, see example.c and pngtest.c.  For usage
+information and restrictions (what little they are) on libpng, see
+png.h.  For a description on using zlib (the compression library used by
+libpng) and zlib's restrictions, see zlib.h
+
+I have included a general makefile, as well as several machine and
+compiler specific ones, but you may have to modify one for your own needs.
+
+You should use zlib 1.0.4 or later to run this, but it MAY work with
+versions as old as zlib 0.95.  Even so, there are bugs in older zlib
+versions which can cause the output of invalid compression streams for
+some images.  You will definitely need zlib 1.0.4 or later if you are
+taking advantage of the MS-DOS "far" structure allocation for the small
+and medium memory models.  You should also note that zlib is a
+compression library that is useful for more things than just PNG files.
+You can use zlib as a drop-in replacement for fread() and fwrite() if
+you are so inclined.
+
+zlib should be available at the same place that libpng is, or at zlib.net.
+
+You may also want a copy of the PNG specification.  It is available
+as an RFC, a W3C Recommendation, and an ISO/IEC Standard.  You can find
+these at http://www.libpng.org/pub/png/pngdocs.html .
+
+This code is currently being archived at libpng.sourceforge.io in the
+[DOWNLOAD] area, and at ftp://ftp-osl.osuosl.org/pub/libpng/src .  If you
+can't find it in any of those places, e-mail me, and I'll help you find it.
+
+I am not a lawyer, but I believe that the Export Control Classification
+Number (ECCN) for libpng is EAR99, which means not subject to export
+controls or International Traffic in Arms Regulations (ITAR) because it
+is open source, publicly available software, that does not contain any
+encryption software.  See the EAR, paragraphs 734.3(b)(3) and 734.7(b).
+
+If you have any code changes, requests, problems, etc., please e-mail
+them to me.  Also, I'd appreciate any make files or project files,
+and any modifications you needed to make to get libpng to compile,
+along with a #define variable to tell what compiler/system you are on.
+If you needed to add transformations to libpng, or wish libpng would
+provide the image in a different way, drop me a note (and code, if
+possible), so I can consider supporting the transformation.
+Finally, if you get any warning messages when compiling libpng
+(note: not zlib), and they are easy to fix, I'd appreciate the
+fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
+
+This release was created and will be supported by myself (of course
+based in a large way on Guy's and Andreas' earlier work), and the PNG
+development group.
+
+Send comments/corrections/commendations to png-mng-implement at
+lists.sourceforge.net (subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-implement
+to subscribe) or to glennrp at users.sourceforge.net
+
+You can't reach Guy, the original libpng author, at the addresses
+given in previous versions of this document.  He and Andreas will
+read mail addressed to the png-implement list, however.
+
+Please do not send general questions about PNG.  Send them to
+png-mng-misc at lists.sf.net (subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
+subscribe).  If you have a question about something
+in the PNG specification that is related to using libpng, send it
+to me.  Send me any questions that start with "I was using libpng,
+and ...".  If in doubt, send questions to me.  I'll bounce them
+to others, if necessary.
+
+Please do not send suggestions on how to change PNG.  We have
+been discussing PNG for twenty years now, and it is official and
+finished.  If you have suggestions for libpng, however, I'll
+gladly listen.  Even if your suggestion is not used immediately,
+it may be used later.
+
+Files in this distribution:
 
       ANNOUNCE      =>  Announcement of this version, with recent changes
-    AUTHORS       =>  List of contributing authors
       CHANGES       =>  Description of changes between libpng versions
-    INSTALL       =>  Instructions to install libpng
+      KNOWNBUG      =>  List of known bugs and deficiencies
       LICENSE       =>  License to use and redistribute libpng
       README        =>  This file
       TODO          =>  Things not implemented in the current library
-    TRADEMARK     =>  Trademark information
+      Y2KINFO       =>  Statement of Y2K compliance
       example.c     =>  Example code for using libpng functions
-    libpng.3      =>  Manual page for libpng (includes libpng-manual.txt)
+      libpng.3      =>  manual page for libpng (includes libpng-manual.txt)
       libpng-manual.txt  =>  Description of libpng and its functions
-    libpngpf.3    =>  Manual page for libpng's private functions (deprecated)
-    png.5         =>  Manual page for the PNG format
+      libpngpf.3    =>  manual page for libpng's private functions
+      png.5         =>  manual page for the PNG format
       png.c         =>  Basic interface functions common to library
       png.h         =>  Library function and interface declarations (public)
       pngpriv.h     =>  Library function and interface declarations (private)
@@ -124,6 +160,7 @@ Files included in this distribution
       pngstruct.h   =>  png_struct declaration (private)
       pnginfo.h     =>  png_info struct declaration (private)
       pngdebug.h    =>  debugging macros (private)
+      pngchunk.h    =>  PNG chunk descriptions (private, new in libpng17)
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
@@ -142,43 +179,38 @@ Files included in this distribution
       pngwrite.c    =>  High-level write functions
       pngwtran.c    =>  Write data transformations
       pngwutil.c    =>  Write utility functions
-    arm/          =>  Optimized code for ARM Neon
-    intel/        =>  Optimized code for INTEL SSE2
-    loongarch/    =>  Optimized code for LoongArch LSX
-    mips/         =>  Optimized code for MIPS MSA and MIPS MMI
-    powerpc/      =>  Optimized code for PowerPC VSX
-    riscv/        =>  Optimized code for the RISC-V platform
-    ci/           =>  Scripts for continuous integration
-    contrib/      =>  External contributions
-        arm-neon/     =>  Optimized code for the ARM-NEON platform
-        mips-msa/     =>  Optimized code for the MIPS-MSA platform
-        powerpc-vsx/  =>  Optimized code for the POWERPC-VSX platform
-        examples/     =>  Examples of libpng usage
-        gregbook/     =>  Source code for PNG reading and writing, from
-                          "PNG: The Definitive Guide" by Greg Roelofs,
+      arm           =>  Contains optimized code for the ARM platform
+      contrib       =>  Contributions
+       examples         =>  Example programs
+       gregbook         =>  source code for PNG reading and writing, from
+                            Greg Roelofs' "PNG: The Definitive Guide",
                             O'Reilly, 1999
-        libtests/     =>  Test programs
-        pngexif/      =>  Program to inspect the EXIF information in PNG files
-        pngminim/     =>  Minimal decoder, encoder, and progressive decoder
-                          programs demonstrating the use of pngusr.dfa
-        pngminus/     =>  Simple pnm2png and png2pnm programs
-        pngsuite/     =>  Test images
-        riscv-rvv/    =>  Optimized code for the RISC-V Vector platform
-        testpngs/     =>  Test images
-        tools/        =>  Various tools
-        visupng/      =>  VisualPng, a Windows viewer for PNG images
-    projects/     =>  Project files and workspaces for various IDEs
-        owatcom/      =>  OpenWatcom project
-        visualc71/    =>  Microsoft Visual C++ 7.1 workspace
-        vstudio/      =>  Microsoft Visual Studio workspace
-    scripts/      =>  Scripts and makefiles for building libpng
-                      (see scripts/README.txt for the complete list)
-    tests/        =>  Test scripts
+       libtests         =>  Test programs
+       pngminim         =>  Minimal decoder, encoder, and progressive decoder
+                            programs demonstrating use of pngusr.dfa
+       pngminus         =>  Simple pnm2png and png2pnm programs
+       pngsuite         =>  Test images
+       tools            =>  Various tools
+       visupng          =>  Contains a MSVC workspace for VisualPng
+      projects      =>  Contains project files and workspaces for
+                        building a DLL
+       owatcom          =>  Contains a WATCOM project for building libpng
+       visualc71        =>  Contains a Microsoft Visual C++ (MSVC)
+                            workspace for building libpng and zlib
+       vstudio          =>  Contains a Microsoft Visual C++ (MSVC)
+                            workspace for building libpng and zlib
+      scripts       =>  Directory containing scripts for building libpng:
+                            (see scripts/README.txt for the list of scripts)
 
-Good luck, and happy coding!
+Good luck, and happy coding.
 
- * Cosmin Truta (current maintainer, since 2018)
- * Glenn Randers-Pehrson (former maintainer, 1998-2018)
- * Andreas Eric Dilger (former maintainer, 1996-1997)
- * Guy Eric Schalnat (original author and former maintainer, 1995-1996)
-   (formerly of Group 42, Inc.)
+-Glenn Randers-Pehrson (current maintainer, since 1998)
+ Internet: glennrp at users.sourceforge.net
+
+-Andreas Eric Dilger (former maintainer, 1996-1997)
+ Internet: adilger at enel.ucalgary.ca
+ Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/
+
+-Guy Eric Schalnat (original author and former maintainer, 1995-1996)
+ (formerly of Group 42, Inc)
+ Internet: gschal at infinet.com

TODO

@@ -1,22 +1,31 @@
-TODO list for libpng
---------------------
+/*
+TODO - list of things to do for libpng:
 
- * Fix all defects (duh!)
- * cHRM transformation.
- * Palette creation.
- * "grayscale->palette" transformation and "palette->grayscale" detection.
- * Improved dithering.
- * Multi-lingual error and warning message support.
- * Complete sRGB transformation.  (Currently it simply uses gamma=0.45455.)
- * Man pages for function calls.
- * Better documentation.
- * Better filter selection
-   (e.g., counting huffman bits/precompression; filter inertia; filter costs).
- * Histogram creation.
- * Text conversion between different code pages (e.g., Latin-1 to Mac).
- * Avoid building gamma tables whenever possible.
- * Greater precision in changing to linear gamma for compositing against
-   background, and in doing rgb-to-gray transformations.
- * Investigate pre-incremented loop counters and other loop constructions.
- * Interpolated method of handling interlacing.
- * More validations for libpng transformations.
+Final bug fixes.
+Better C++ wrapper/full C++ implementation?
+Fix problem with C++ and EXTERN "C".
+cHRM transformation.
+Remove setjmp/longjmp usage in favor of returning error codes. As a start on
+  this, minimize the use of png_error(), replacing them with
+  png_warning(); return(0); or similar.
+Palette creation.
+Add "grayscale->palette" transformation and "palette->grayscale" detection.
+Improved dithering.
+Multi-lingual error and warning message support.
+Complete sRGB transformation (presently it simply uses gamma=0.45455).
+Man pages for function calls.
+Better documentation.
+Better filter selection
+   (counting huffman bits/precompression?  filter inertia?  filter costs?).
+Histogram creation.
+Text conversion between different code pages (Latin-1 -> Mac and DOS).
+Avoid building gamma tables whenever possible.
+Use greater precision when changing to linear gamma for compositing against
+  background and doing rgb-to-gray transformation.
+Investigate pre-incremented loop counters and other loop constructions.
+Add interpolated method of handling interlacing.
+Extend pngvalid.c to validate more of the libpng transformations.
+Refactor preprocessor conditionals to compile entire statements
+Quiet compiler warnings (mostly -Wconversion warnings).
+
+*/

TRADEMARK

@@ -1,8 +0,0 @@
-TRADEMARK
-=========
-
-The name "libpng" has not been registered by the Copyright owners
-as a trademark in any jurisdiction.  However, because libpng has
-been distributed and maintained world-wide, continually since 1995,
-the Copyright owners claim "common-law trademark protection" in any
-jurisdiction where common-law trademark is recognized.

arm/filter_neon.S

@@ -1,60 +0,0 @@
-/* filter_neon.S - placeholder file
- *
- * Copyright (c) 2024 Cosmin Truta
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-/* IMPORTANT NOTE:
- *
- * Historically, the hand-coded assembler implementation of Neon optimizations
- * in this module had not been in sync with the intrinsics-based implementation
- * in filter_neon_intrinsics.c and palette_neon_intrinsics.c, at least since
- * the introduction of riffled palette optimizations. Moreover, the assembler
- * code used to work on 32-bit ARM only, and it caused problems, even if empty,
- * on 64-bit ARM.
- *
- * All references to this module from our internal build scripts and projects
- * have been removed.
- *
- * For the external projects that might still expect this module to be present,
- * we leave this stub in place, for the remaining lifetime of libpng-1.6.x.
- * Everything should continue to function normally, as long as there are no
- * deliberate attempts to use the old hand-made assembler code. A build error
- * will be raised otherwise.
- */
-
-/* This is required to get the symbol renames, which are #defines, and the
- * definitions (or not) of PNG_ARM_NEON_OPT and PNG_ARM_NEON_IMPLEMENTATION.
- */
-#define PNG_VERSION_INFO_ONLY
-#include "../pngpriv.h"
-
-#ifdef PNG_READ_SUPPORTED
-#if PNG_ARM_NEON_IMPLEMENTATION == 2 /* hand-coded assembler */
-#if PNG_ARM_NEON_OPT > 0
-
-#if defined(__clang__)
-#define GNUC_VERSION 0 /* not gcc, although it might pretend to be */
-#elif defined(__GNUC__)
-#define GNUC_MAJOR (__GNUC__ + 0)
-#define GNUC_MINOR (__GNUC_MINOR__ + 0)
-#define GNUC_PATCHLEVEL (__GNUC_PATCHLEVEL__ + 0)
-#define GNUC_VERSION (GNUC_MAJOR * 10000 + GNUC_MINOR * 100 + GNUC_PATCHLEVEL)
-#else
-#define GNUC_VERSION 0 /* not gcc */
-#endif
-
-#if (GNUC_VERSION > 0) && (GNUC_VERSION < 40300)
-#error "PNG_ARM_NEON is not supported with gcc versions earlier than 4.3.0"
-#elif GNUC_VERSION == 40504
-#error "PNG_ARM_NEON is not supported with gcc version 4.5.4"
-#else
-#error "Please use 'arm/*_neon_intrinsics.c' for PNG_ARM_NEON support"
-#endif
-
-#endif /* PNG_ARM_NEON_OPT > 0 */
-#endif /* PNG_ARM_NEON_IMPLEMENTATION == 2 */
-#endif /* READ */

arm/palette_neon_intrinsics.c

@@ -1,150 +0,0 @@
-/* palette_neon_intrinsics.c - NEON optimised palette expansion functions
- *
- * Copyright (c) 2018-2019 Cosmin Truta
- * Copyright (c) 2017-2018 Arm Holdings. All rights reserved.
- * Written by Richard Townsend <Richard.Townsend@arm.com>, February 2017.
- *
- * This code is released under the libpng license.
- * For conditions of distribution and use, see the disclaimer
- * and license in png.h
- */
-
-#include "../pngpriv.h"
-
-#if PNG_ARM_NEON_IMPLEMENTATION == 1
-
-#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_ARM64)
-#  include <arm64_neon.h>
-#else
-#  include <arm_neon.h>
-#endif
-
-/* Build an RGBA8 palette from the separate RGB and alpha palettes. */
-void
-png_riffle_palette_neon(png_structrp png_ptr)
-{
-   png_const_colorp palette = png_ptr->palette;
-   png_bytep riffled_palette = png_ptr->riffled_palette;
-   png_const_bytep trans_alpha = png_ptr->trans_alpha;
-   int num_trans = png_ptr->num_trans;
-   int i;
-
-   /* Initially black, opaque. */
-   uint8x16x4_t w = {{
-      vdupq_n_u8(0x00),
-      vdupq_n_u8(0x00),
-      vdupq_n_u8(0x00),
-      vdupq_n_u8(0xff),
-   }};
-
-   png_debug(1, "in png_riffle_palette_neon");
-
-   /* First, riffle the RGB colours into an RGBA8 palette.
-    * The alpha component is set to opaque for now.
-    */
-   for (i = 0; i < 256; i += 16)
-   {
-      uint8x16x3_t v = vld3q_u8((png_const_bytep)(palette + i));
-      w.val[0] = v.val[0];
-      w.val[1] = v.val[1];
-      w.val[2] = v.val[2];
-      vst4q_u8(riffled_palette + (i << 2), w);
-   }
-
-   /* Fix up the missing transparency values. */
-   for (i = 0; i < num_trans; i++)
-      riffled_palette[(i << 2) + 3] = trans_alpha[i];
-}
-
-/* Expands a palettized row into RGBA8. */
-int
-png_do_expand_palette_rgba8_neon(png_structrp png_ptr, png_row_infop row_info,
-    png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
-{
-   png_uint_32 row_width = row_info->width;
-   const png_uint_32 *riffled_palette =
-      png_aligncastconst(png_const_uint_32p, png_ptr->riffled_palette);
-   const png_uint_32 pixels_per_chunk = 4;
-   png_uint_32 i;
-
-   png_debug(1, "in png_do_expand_palette_rgba8_neon");
-
-   PNG_UNUSED(row)
-   if (row_width < pixels_per_chunk)
-      return 0;
-
-   /* This function originally gets the last byte of the output row.
-    * The NEON part writes forward from a given position, so we have
-    * to seek this back by 4 pixels x 4 bytes.
-    */
-   *ddp = *ddp - ((pixels_per_chunk * sizeof(png_uint_32)) - 1);
-
-   for (i = 0; i < row_width; i += pixels_per_chunk)
-   {
-      uint32x4_t cur;
-      png_bytep sp = *ssp - i, dp = *ddp - (i << 2);
-      cur = vld1q_dup_u32 (riffled_palette + *(sp - 3));
-      cur = vld1q_lane_u32(riffled_palette + *(sp - 2), cur, 1);
-      cur = vld1q_lane_u32(riffled_palette + *(sp - 1), cur, 2);
-      cur = vld1q_lane_u32(riffled_palette + *(sp - 0), cur, 3);
-      vst1q_u32((void *)dp, cur);
-   }
-   if (i != row_width)
-   {
-      /* Remove the amount that wasn't processed. */
-      i -= pixels_per_chunk;
-   }
-
-   /* Decrement output pointers. */
-   *ssp = *ssp - i;
-   *ddp = *ddp - (i << 2);
-   return i;
-}
-
-/* Expands a palettized row into RGB8. */
-int
-png_do_expand_palette_rgb8_neon(png_structrp png_ptr, png_row_infop row_info,
-    png_const_bytep row, png_bytepp ssp, png_bytepp ddp)
-{
-   png_uint_32 row_width = row_info->width;
-   png_const_bytep palette = (png_const_bytep)png_ptr->palette;
-   const png_uint_32 pixels_per_chunk = 8;
-   png_uint_32 i;
-
-   png_debug(1, "in png_do_expand_palette_rgb8_neon");
-
-   PNG_UNUSED(row)
-   if (row_width <= pixels_per_chunk)
-      return 0;
-
-   /* Seeking this back by 8 pixels x 3 bytes. */
-   *ddp = *ddp - ((pixels_per_chunk * sizeof(png_color)) - 1);
-
-   for (i = 0; i < row_width; i += pixels_per_chunk)
-   {
-      uint8x8x3_t cur;
-      png_bytep sp = *ssp - i, dp = *ddp - ((i << 1) + i);
-      cur = vld3_dup_u8(palette + sizeof(png_color) * (*(sp - 7)));
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 6)), cur, 1);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 5)), cur, 2);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 4)), cur, 3);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 3)), cur, 4);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 2)), cur, 5);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 1)), cur, 6);
-      cur = vld3_lane_u8(palette + sizeof(png_color) * (*(sp - 0)), cur, 7);
-      vst3_u8((void *)dp, cur);
-   }
-
-   if (i != row_width)
-   {
-      /* Remove the amount that wasn't processed. */
-      i -= pixels_per_chunk;
-   }
-
-   /* Decrement output pointers. */
-   *ssp = *ssp - i;
-   *ddp = *ddp - ((i << 1) + i);
-   return i;
-}
-
-#endif /* PNG_ARM_NEON_IMPLEMENTATION */

autogen.sh

@@ -77,14 +77,13 @@ libpng_autotools_files="Makefile.in aclocal.m4 config.guess config.h.in
    config.sub configure depcomp install-sh ltmain.sh missing\
    test-driver"
 #
-# Files generated by versions of autoconf >2.68 or automake >1.13 (i.e. later
+# Files generated by versions of configue >2.68 or automake >1.13 (i.e. later
 # versions than those required by configure.ac):
 libpng_autotools_extra="compile config.h.in~"
 #
 # These are separate because 'maintainer-clean' does not remove them.
-libpng_libtool_files="scripts/autoconf/libtool.m4 scripts/autoconf/ltoptions.m4\
-   scripts/autoconf/ltsugar.m4 scripts/autoconf/ltversion.m4\
-   scripts/autoconf/lt~obsolete.m4"
+libpng_libtool_files="scripts/libtool.m4 scripts/ltoptions.m4\
+   scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4"
 
 libpng_autotools_dirs="autom4te.cache" # not required
 #
@@ -195,7 +194,7 @@ case "$mode" in
       if test -d .git
       then
          exec >&2
-         echo "ERROR: running autoreconf on an initialized system"
+         echo "ERROR: running autoreconf on an initialized sytem"
          echo "  This is not necessary; it is only necessary to remake the"
          echo "  autotools generated files if Makefile.am or configure.ac"
          echo "  change and make does the right thing with:"

ci/.shellcheckrc

@@ -1,11 +0,0 @@
-# Disable the "expressions don't expand in single quotes, use double quotes"
-# advice. We need the regular expressions to remain uninterpolated.
-disable=SC2016
-
-# Disable the "variable appears unused" warning caused by the use of getopts
-# with an obligatory (but unused) variable name in the main function.
-disable=SC2034
-
-# Disable all the "quote to prevent globbing or word splitting" advice.
-# We need word splitting for well-known variables like MAKEFLAGS and CFLAGS.
-disable=SC2086,SC2206

ci/LICENSE_MIT.txt

@@ -1,19 +0,0 @@
-MIT License
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

ci/README.md

@@ -1,25 +0,0 @@
-Scripts for the Continuous Integration of the PNG Reference Library
-===================================================================
-
-Copyright Notice
-----------------
-
-Copyright (c) 2019-2025 Cosmin Truta.
-
-Use, modification and distribution are subject to the MIT License.
-Please see the accompanying file `LICENSE_MIT.txt` or visit
-https://opensource.org/license/mit
-
-File List
----------
-
-    LICENSE_MIT.txt         ==>  The License file
-    README.md               ==>  This file
-    ci_lint.sh              ==>  Lint the source code
-    ci_shellify.sh          ==>  Convert select definitions to shell syntax
-    ci_verify_cmake.sh      ==>  Verify the build driven by CMakeLists.txt
-    ci_verify_configure.sh  ==>  Verify the build driven by configure
-    ci_verify_makefiles.sh  ==>  Verify the build driven by scripts/makefile.*
-    ci_verify_version.sh    ==>  Verify the consistency of version definitions
-    lib/ci.lib.sh           ==>  Shell utilities for the main ci_*.sh scripts
-    targets/*/ci_env.*.sh   ==>  Shell environments for cross-platform testing

ci/ci_lint.sh

@@ -1,142 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/lib/ci.lib.sh"
-cd "$CI_TOPLEVEL_DIR"
-
-# Initialize the global constants CI_{...}{CHECK,CHECKER,LINT}.
-CI_SHELLCHECK="${CI_SHELLCHECK:-shellcheck}"
-CI_EDITORCONFIG_CHECKER="${CI_EDITORCONFIG_CHECKER:-editorconfig-checker}"
-CI_YAMLLINT="${CI_YAMLLINT:-yamllint}"
-
-# Initialize the global lint status.
-CI_LINT_STATUS=0
-
-function ci_init_lint {
-    ci_info "## START OF LINTING ##"
-    local my_program
-    # Complete the initialization of CI_SHELLCHECK.
-    # Set it to the empty string if the shellcheck program is unavailable.
-    my_program="$(command -v "$CI_SHELLCHECK")" || {
-        ci_warn "program not found: '$CI_SHELLCHECK'"
-    }
-    CI_SHELLCHECK="$my_program"
-    # Complete the initialization of CI_EDITORCONFIG_CHECKER.
-    # Set it to the empty string if the editorconfig-checker program is unavailable.
-    my_program="$(command -v "$CI_EDITORCONFIG_CHECKER")" || {
-        ci_warn "program not found: '$CI_EDITORCONFIG_CHECKER'"
-    }
-    CI_EDITORCONFIG_CHECKER="$my_program"
-    # Complete the initialization of CI_YAMLLINT.
-    # Set it to the empty string if the yamllint program is unavailable.
-    my_program="$(command -v "$CI_YAMLLINT")" || {
-        ci_warn "program not found: '$CI_YAMLLINT'"
-    }
-    CI_YAMLLINT="$my_program"
-}
-
-function ci_finish_lint {
-    ci_info "## END OF LINTING ##"
-    if [[ $CI_LINT_STATUS -eq 0 ]]
-    then
-        ci_info "## SUCCESS ##"
-    else
-        ci_info "linting failed"
-    fi
-    return "$CI_LINT_STATUS"
-}
-
-function ci_lint_ci_scripts {
-    [[ -x $CI_SHELLCHECK ]] || {
-        ci_warn "## NOT LINTING: CI scripts ##"
-        return 0
-    }
-    ci_info "## LINTING: CI scripts ##"
-    ci_spawn "$CI_SHELLCHECK" --version
-    find ./ci -name "ci_*.sh" -not -name "ci_env.*.sh" | {
-        local my_file
-        while IFS="" read -r my_file
-        do
-            ci_spawn "$CI_SHELLCHECK" -x "$my_file" || {
-                # Linting failed.
-                return 1
-            }
-        done
-    }
-}
-
-function ci_lint_text_files {
-    [[ -x $CI_EDITORCONFIG_CHECKER ]] || {
-        ci_warn "## NOT LINTING: text files ##"
-        return 0
-    }
-    ci_info "## LINTING: text files ##"
-    ci_spawn "$CI_EDITORCONFIG_CHECKER" --version
-    ci_spawn "$CI_EDITORCONFIG_CHECKER" --config .editorconfig-checker.json || {
-        # Linting failed.
-        return 1
-    }
-}
-
-function ci_lint_yaml_files {
-    [[ -x $CI_YAMLLINT ]] || {
-        ci_warn "## NOT LINTING: YAML files ##"
-        return 0
-    }
-    ci_info "## LINTING: YAML files ##"
-    ci_spawn "$CI_YAMLLINT" --version
-    # Considering that the YAML format is an extension of the JSON format,
-    # we can lint both the YAML files and the plain JSON files here.
-    find . \( -iname "*.yml" -o -iname "*.yaml" -o -iname "*.json" \) -not -path "./out/*" | {
-        local my_file
-        while IFS="" read -r my_file
-        do
-            ci_spawn "$CI_YAMLLINT" --strict "$my_file" || {
-                # Linting failed.
-                return 1
-            }
-        done
-    }
-}
-
-function ci_lint {
-    ci_init_lint
-    ci_lint_ci_scripts || CI_LINT_STATUS=1
-    ci_lint_text_files || CI_LINT_STATUS=1
-    ci_lint_yaml_files || CI_LINT_STATUS=1
-    # TODO: ci_lint_png_files, etc.
-    ci_finish_lint
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>]"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] || {
-        echo >&2 "error: unexpected argument: '$1'"
-        usage 2
-    }
-    # And... go!
-    ci_lint
-}
-
-main "$@"

ci/ci_verify_cmake.sh

@@ -1,209 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/lib/ci.lib.sh"
-cd "$CI_TOPLEVEL_DIR"
-
-CI_SRC_DIR="$CI_TOPLEVEL_DIR"
-CI_OUT_DIR="$CI_TOPLEVEL_DIR/out"
-CI_BUILD_DIR="$CI_OUT_DIR/ci_verify_cmake.$CI_TARGET_SYSTEM.$CI_TARGET_ARCH.build"
-CI_INSTALL_DIR="$CI_OUT_DIR/ci_verify_cmake.$CI_TARGET_SYSTEM.$CI_TARGET_ARCH.install"
-
-function ci_init_build {
-    # Ensure that the mandatory variables are initialized.
-    CI_CMAKE="${CI_CMAKE:-cmake}"
-    CI_CTEST="${CI_CTEST:-ctest}"
-    CI_CMAKE_BUILD_TYPE="${CI_CMAKE_BUILD_TYPE:-Release}"
-    if [[ $CI_CMAKE_GENERATOR == "Visual Studio"* ]]
-    then
-        # Clean up incidental mixtures of Windows and Bash-on-Windows
-        # environment variables, to avoid confusing MSBuild.
-        [[ $TEMP && ( $Temp || $temp ) ]] && unset TEMP
-        [[ $TMP && ( $Tmp || $tmp ) ]] && unset TMP
-        # Ensure that CI_CMAKE_GENERATOR_PLATFORM is initialized for this generator.
-        [[ $CI_CMAKE_GENERATOR_PLATFORM ]] || {
-            ci_err_internal "missing \$CI_CMAKE_GENERATOR_PLATFORM"
-        }
-    elif [[ -x $(command -v ninja) ]]
-    then
-        CI_CMAKE_GENERATOR="${CI_CMAKE_GENERATOR:-Ninja}"
-    fi
-}
-
-function ci_trace_build {
-    ci_info "## START OF CONFIGURATION ##"
-    ci_info "build arch: $CI_BUILD_ARCH"
-    ci_info "build system: $CI_BUILD_SYSTEM"
-    [[ "$CI_TARGET_SYSTEM.$CI_TARGET_ARCH" != "$CI_BUILD_SYSTEM.$CI_BUILD_ARCH" ]] && {
-        ci_info "target arch: $CI_TARGET_ARCH"
-        ci_info "target system: $CI_TARGET_SYSTEM"
-    }
-    ci_info "source directory: $CI_SRC_DIR"
-    ci_info "build directory: $CI_BUILD_DIR"
-    ci_info "install directory: $CI_INSTALL_DIR"
-    ci_info "environment option: \$CI_CMAKE: '$CI_CMAKE'"
-    ci_info "environment option: \$CI_CMAKE_GENERATOR: '$CI_CMAKE_GENERATOR'"
-    ci_info "environment option: \$CI_CMAKE_GENERATOR_PLATFORM: '$CI_CMAKE_GENERATOR_PLATFORM'"
-    ci_info "environment option: \$CI_CMAKE_BUILD_TYPE: '$CI_CMAKE_BUILD_TYPE'"
-    ci_info "environment option: \$CI_CMAKE_BUILD_FLAGS: '$CI_CMAKE_BUILD_FLAGS'"
-    ci_info "environment option: \$CI_CMAKE_TOOLCHAIN_FILE: '$CI_CMAKE_TOOLCHAIN_FILE'"
-    ci_info "environment option: \$CI_CMAKE_VARS: '$CI_CMAKE_VARS'"
-    ci_info "environment option: \$CI_CTEST: '$CI_CTEST'"
-    ci_info "environment option: \$CI_CTEST_FLAGS: '$CI_CTEST_FLAGS'"
-    ci_info "environment option: \$CI_CC: '$CI_CC'"
-    ci_info "environment option: \$CI_CC_FLAGS: '$CI_CC_FLAGS'"
-    ci_info "environment option: \$CI_AR: '$CI_AR'"
-    ci_info "environment option: \$CI_RANLIB: '$CI_RANLIB'"
-    ci_info "environment option: \$CI_SANITIZERS: '$CI_SANITIZERS'"
-    ci_info "environment option: \$CI_FORCE: '$CI_FORCE'"
-    ci_info "environment option: \$CI_NO_BUILD: '$CI_NO_BUILD'"
-    ci_info "environment option: \$CI_NO_TEST: '$CI_NO_TEST'"
-    ci_info "environment option: \$CI_NO_INSTALL: '$CI_NO_INSTALL'"
-    ci_info "environment option: \$CI_NO_CLEAN: '$CI_NO_CLEAN'"
-    ci_info "executable: \$CI_CMAKE: $(command -V "$CI_CMAKE")"
-    ci_info "executable: \$CI_CTEST: $(command -V "$CI_CTEST")"
-    [[ $CI_CC ]] && {
-        ci_info "executable: \$CI_CC: $(command -V "$CI_CC")"
-    }
-    [[ $CI_AR ]] && {
-        ci_info "executable: \$CI_AR: $(command -V "$CI_AR")"
-    }
-    [[ $CI_RANLIB ]] && {
-        ci_info "executable: \$CI_RANLIB: $(command -V "$CI_RANLIB")"
-    }
-    ci_info "## END OF CONFIGURATION ##"
-}
-
-function ci_cleanup_old_build {
-    ci_info "## START OF PRE-BUILD CLEANUP ##"
-    [[ ! -e $CI_BUILD_DIR && ! -e $CI_INSTALL_DIR ]] || {
-        ci_spawn rm -fr "$CI_BUILD_DIR"
-        ci_spawn rm -fr "$CI_INSTALL_DIR"
-    }
-    ci_info "## END OF PRE-BUILD CLEANUP ##"
-}
-
-function ci_build {
-    ci_info "## START OF BUILD ##"
-    # Adjust the CI environment variables, as needed.
-    CI_CMAKE="$(command -v "$CI_CMAKE")" || ci_err "bad or missing \$CI_CMAKE"
-    ci_spawn "$CI_CMAKE" --version
-    CI_CTEST="$(command -v "$CI_CTEST")" || ci_err "bad or missing \$CI_CTEST"
-    ci_spawn "$CI_CTEST" --version
-    [[ $CI_CMAKE_GENERATOR == *"Ninja"* ]] && {
-        CI_NINJA="$(command -v ninja)" || ci_err "bad or missing ninja, no pun intended"
-        ci_spawn "$CI_NINJA" --version
-    }
-    [[ $CI_AR ]] && {
-        # Use the full path of CI_AR to work around a mysterious CMake error.
-        CI_AR="$(command -v "$CI_AR")" || ci_err "bad or missing \$CI_AR"
-    }
-    [[ $CI_RANLIB ]] && {
-        # Use the full path of CI_RANLIB to work around a mysterious CMake error.
-        CI_RANLIB="$(command -v "$CI_RANLIB")" || ci_err "bad or missing \$CI_RANLIB"
-    }
-    # Export the CMake environment variables.
-    [[ $CI_CMAKE_GENERATOR ]] && {
-        ci_spawn export CMAKE_GENERATOR="$CI_CMAKE_GENERATOR"
-    }
-    [[ $CI_CMAKE_GENERATOR_PLATFORM ]] && {
-        ci_spawn export CMAKE_GENERATOR_PLATFORM="$CI_CMAKE_GENERATOR_PLATFORM"
-    }
-    # Initialize and populate the local arrays.
-    local all_cmake_vars=()
-    local all_cmake_build_flags=()
-    local all_ctest_flags=()
-    [[ $CI_CMAKE_TOOLCHAIN_FILE ]] && {
-        all_cmake_vars+=("-DCMAKE_TOOLCHAIN_FILE=$CI_CMAKE_TOOLCHAIN_FILE")
-    }
-    [[ $CI_CC ]] && {
-        all_cmake_vars+=("-DCMAKE_C_COMPILER=$CI_CC")
-    }
-    [[ $CI_CC_FLAGS || $CI_SANITIZERS ]] && {
-        [[ $CI_SANITIZERS ]] && CI_CC_FLAGS+="${CI_CC_FLAGS:+" "}-fsanitize=$CI_SANITIZERS"
-        all_cmake_vars+=("-DCMAKE_C_FLAGS=$CI_CC_FLAGS")
-    }
-    [[ $CI_AR ]] && {
-        all_cmake_vars+=("-DCMAKE_AR=$CI_AR")
-    }
-    [[ $CI_RANLIB ]] && {
-        all_cmake_vars+=("-DCMAKE_RANLIB=$CI_RANLIB")
-    }
-    all_cmake_vars+=("-DCMAKE_BUILD_TYPE=$CI_CMAKE_BUILD_TYPE")
-    all_cmake_vars+=("-DCMAKE_VERBOSE_MAKEFILE=ON")
-    all_cmake_vars+=($CI_CMAKE_VARS)
-    all_cmake_build_flags+=($CI_CMAKE_BUILD_FLAGS)
-    all_ctest_flags+=($CI_CTEST_FLAGS)
-    # And... build!
-    ci_spawn mkdir -p "$CI_BUILD_DIR"
-    # Spawn "cmake ...".
-    ci_spawn "$CI_CMAKE" -B "$CI_BUILD_DIR" \
-                         -S . \
-                         -DCMAKE_INSTALL_PREFIX="$CI_INSTALL_DIR" \
-                         "${all_cmake_vars[@]}"
-    ci_expr $((CI_NO_BUILD)) || {
-        # Spawn "cmake --build ...".
-        ci_spawn "$CI_CMAKE" --build "$CI_BUILD_DIR" \
-                             --config "$CI_CMAKE_BUILD_TYPE" \
-                             "${all_cmake_build_flags[@]}"
-    }
-    ci_expr $((CI_NO_TEST)) || {
-        # Spawn "ctest" if testing is not disabled.
-        ci_spawn pushd "$CI_BUILD_DIR"
-        ci_spawn "$CI_CTEST" --build-config "$CI_CMAKE_BUILD_TYPE" \
-                             "${all_ctest_flags[@]}"
-        ci_spawn popd
-    }
-    ci_expr $((CI_NO_INSTALL)) || {
-        # Spawn "cmake --build ... --target install" if installation is not disabled.
-        ci_spawn "$CI_CMAKE" --build "$CI_BUILD_DIR" \
-                             --config "$CI_CMAKE_BUILD_TYPE" \
-                             --target install \
-                             "${all_cmake_build_flags[@]}"
-    }
-    ci_expr $((CI_NO_CLEAN)) || {
-        # Spawn "make --build ... --target clean" if cleaning is not disabled.
-        ci_spawn "$CI_CMAKE" --build "$CI_BUILD_DIR" \
-                             --config "$CI_CMAKE_BUILD_TYPE" \
-                             --target clean \
-                             "${all_cmake_build_flags[@]}"
-    }
-    ci_info "## END OF BUILD ##"
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>]"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    # And... go!
-    ci_init_build
-    ci_trace_build
-    [[ $# -eq 0 ]] || {
-        echo >&2 "error: unexpected argument: '$1'"
-        echo >&2 "note: this program accepts environment options only"
-        usage 2
-    }
-    ci_cleanup_old_build
-    ci_build
-}
-
-main "$@"

ci/ci_verify_configure.sh

@@ -1,182 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/lib/ci.lib.sh"
-cd "$CI_TOPLEVEL_DIR"
-
-CI_SRC_DIR="$CI_TOPLEVEL_DIR"
-CI_OUT_DIR="$CI_TOPLEVEL_DIR/out"
-CI_BUILD_DIR="$CI_OUT_DIR/ci_verify_configure.$CI_TARGET_SYSTEM.$CI_TARGET_ARCH.build"
-CI_INSTALL_DIR="$CI_OUT_DIR/ci_verify_configure.$CI_TARGET_SYSTEM.$CI_TARGET_ARCH.install"
-
-function ci_init_build {
-    # Ensure that the mandatory variables are initialized.
-    CI_MAKE="${CI_MAKE:-make}"
-    [[ "$CI_TARGET_SYSTEM.$CI_TARGET_ARCH" != "$CI_BUILD_SYSTEM.$CI_BUILD_ARCH" ]] || {
-        # For native builds, set CI_CC to "cc" by default if the cc command is available.
-        # The configure script defaults CC to "gcc", which is not always a good idea.
-        [[ -x $(command -v cc) ]] && CI_CC="${CI_CC:-cc}"
-    }
-    # Ensure that the CI_ variables that cannot be customized reliably are not initialized.
-    [[ ! $CI_CONFIGURE_VARS ]] || {
-        ci_err "unsupported: \$CI_CONFIGURE_VARS='$CI_CONFIGURE_VARS'"
-    }
-    [[ ! $CI_MAKE_VARS ]] || {
-        ci_err "unsupported: \$CI_MAKE_VARS='$CI_MAKE_VARS'"
-    }
-}
-
-function ci_trace_build {
-    ci_info "## START OF CONFIGURATION ##"
-    ci_info "build arch: $CI_BUILD_ARCH"
-    ci_info "build system: $CI_BUILD_SYSTEM"
-    [[ "$CI_TARGET_SYSTEM.$CI_TARGET_ARCH" != "$CI_BUILD_SYSTEM.$CI_BUILD_ARCH" ]] && {
-        ci_info "target arch: $CI_TARGET_ARCH"
-        ci_info "target system: $CI_TARGET_SYSTEM"
-    }
-    ci_info "source directory: $CI_SRC_DIR"
-    ci_info "build directory: $CI_BUILD_DIR"
-    ci_info "install directory: $CI_INSTALL_DIR"
-    ci_info "environment option: \$CI_CONFIGURE_FLAGS: '$CI_CONFIGURE_FLAGS'"
-    ci_info "environment option: \$CI_MAKE: '$CI_MAKE'"
-    ci_info "environment option: \$CI_MAKE_FLAGS: '$CI_MAKE_FLAGS'"
-    ci_info "environment option: \$CI_CC: '$CI_CC'"
-    ci_info "environment option: \$CI_CC_FLAGS: '$CI_CC_FLAGS'"
-    ci_info "environment option: \$CI_CPP: '$CI_CPP'"
-    ci_info "environment option: \$CI_CPP_FLAGS: '$CI_CPP_FLAGS'"
-    ci_info "environment option: \$CI_AR: '$CI_AR'"
-    ci_info "environment option: \$CI_RANLIB: '$CI_RANLIB'"
-    ci_info "environment option: \$CI_LD: '$CI_LD'"
-    ci_info "environment option: \$CI_LD_FLAGS: '$CI_LD_FLAGS'"
-    ci_info "environment option: \$CI_SANITIZERS: '$CI_SANITIZERS'"
-    ci_info "environment option: \$CI_FORCE: '$CI_FORCE'"
-    ci_info "environment option: \$CI_NO_BUILD: '$CI_NO_BUILD'"
-    ci_info "environment option: \$CI_NO_TEST: '$CI_NO_TEST'"
-    ci_info "environment option: \$CI_NO_INSTALL: '$CI_NO_INSTALL'"
-    ci_info "environment option: \$CI_NO_CLEAN: '$CI_NO_CLEAN'"
-    ci_info "executable: \$CI_MAKE: $(command -V "$CI_MAKE")"
-    [[ $CI_CC ]] && {
-        ci_info "executable: \$CI_CC: $(command -V "$CI_CC")"
-    }
-    [[ $CI_CPP ]] && {
-        ci_info "executable: \$CI_CPP: $(command -V "$CI_CPP")"
-    }
-    [[ $CI_AR ]] && {
-        ci_info "executable: \$CI_AR: $(command -V "$CI_AR")"
-    }
-    [[ $CI_RANLIB ]] && {
-        ci_info "executable: \$CI_RANLIB: $(command -V "$CI_RANLIB")"
-    }
-    [[ $CI_LD ]] && {
-        ci_info "executable: \$CI_LD: $(command -V "$CI_LD")"
-    }
-    ci_info "## END OF CONFIGURATION ##"
-}
-
-function ci_cleanup_old_build {
-    ci_info "## START OF PRE-BUILD CLEANUP ##"
-    [[ ! -e $CI_BUILD_DIR && ! -e $CI_INSTALL_DIR ]] || {
-        ci_spawn rm -fr "$CI_BUILD_DIR"
-        ci_spawn rm -fr "$CI_INSTALL_DIR"
-    }
-    [[ ! -e "$CI_SRC_DIR/config.status" ]] || {
-        ci_warn "unexpected build configuration file: '$CI_SRC_DIR/config.status'"
-        if ci_expr $((CI_FORCE))
-        then
-            # Delete the old config and (possibly) the old build.
-            ci_info "note: forcing an in-tree build cleanup"
-            if [[ -f $CI_SRC_DIR/Makefile ]]
-            then
-                ci_spawn make -C "$CI_SRC_DIR" distclean
-            else
-                ci_spawn rm -fr "$CI_SRC_DIR"/config.{log,status}
-            fi
-        else
-            # Alert the user, but do not delete their files.
-            ci_warn "the configure script might fail"
-            ci_info "hint: consider using the option \$CI_FORCE=1"
-        fi
-    }
-    ci_info "## END OF PRE-BUILD CLEANUP ##"
-}
-
-function ci_build {
-    ci_info "## START OF BUILD ##"
-    # Export the configure build environment.
-    [[ $CI_CC ]] && ci_spawn export CC="$CI_CC"
-    [[ $CI_CC_FLAGS ]] && ci_spawn export CFLAGS="$CI_CC_FLAGS"
-    [[ $CI_CPP ]] && ci_spawn export CPP="$CI_CPP"
-    [[ $CI_CPP_FLAGS ]] && ci_spawn export CPPFLAGS="$CI_CPP_FLAGS"
-    [[ $CI_AR ]] && ci_spawn export AR="$CI_AR"
-    [[ $CI_RANLIB ]] && ci_spawn export RANLIB="$CI_RANLIB"
-    [[ $CI_LD ]] && ci_spawn export LD="$CI_LD"
-    [[ $CI_LD_FLAGS ]] && ci_spawn export LDFLAGS="$CI_LD_FLAGS"
-    [[ $CI_SANITIZERS ]] && {
-        ci_spawn export CFLAGS="${CFLAGS:-"-O2"} -fsanitize=$CI_SANITIZERS"
-        ci_spawn export LDFLAGS="${LDFLAGS}${LDFLAGS:+" "}-fsanitize=$CI_SANITIZERS"
-    }
-    # Spawn "autogen.sh" if the configure script is not available.
-    [[ -x "$CI_SRC_DIR/configure" ]] || {
-        ci_spawn "$CI_SRC_DIR/autogen.sh" --maintainer
-    }
-    # And... build!
-    ci_spawn mkdir -p "$CI_BUILD_DIR"
-    ci_spawn cd "$CI_BUILD_DIR"
-    # Spawn "configure".
-    ci_spawn "$CI_SRC_DIR/configure" --prefix="$CI_INSTALL_DIR" $CI_CONFIGURE_FLAGS
-    ci_expr $((CI_NO_BUILD)) || {
-        # Spawn "make".
-        ci_spawn "$CI_MAKE" $CI_MAKE_FLAGS
-    }
-    ci_expr $((CI_NO_TEST)) || {
-        # Spawn "make test" if testing is not disabled.
-        ci_spawn "$CI_MAKE" $CI_MAKE_FLAGS test
-    }
-    ci_expr $((CI_NO_INSTALL)) || {
-        # Spawn "make install" if installation is not disabled.
-        ci_spawn "$CI_MAKE" $CI_MAKE_FLAGS install
-    }
-    ci_expr $((CI_NO_CLEAN)) || {
-        # Spawn "make clean" and "make distclean" if cleaning is not disabled.
-        ci_spawn "$CI_MAKE" $CI_MAKE_FLAGS clean
-        ci_spawn "$CI_MAKE" $CI_MAKE_FLAGS distclean
-    }
-    ci_info "## END OF BUILD ##"
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>]"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    # And... go!
-    ci_init_build
-    ci_trace_build
-    [[ $# -eq 0 ]] || {
-        echo >&2 "error: unexpected argument: '$1'"
-        echo >&2 "note: this program accepts environment options only"
-        usage 2
-    }
-    ci_cleanup_old_build
-    ci_build
-}
-
-main "$@"

ci/ci_verify_makefiles.sh

@@ -1,200 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/lib/ci.lib.sh"
-cd "$CI_TOPLEVEL_DIR"
-
-CI_SRC_DIR="$CI_TOPLEVEL_DIR"
-
-function ci_init_build {
-    # Ensure that the mandatory variables are initialized.
-    CI_MAKE="${CI_MAKE:-make}"
-    case "$CI_CC" in
-    ( *clang* )
-        CI_MAKEFILES="${CI_MAKEFILES:-"scripts/makefile.clang"}" ;;
-    ( *gcc* )
-        CI_MAKEFILES="${CI_MAKEFILES:-"scripts/makefile.gcc"}" ;;
-    ( * )
-        CI_MAKEFILES="${CI_MAKEFILES:-"scripts/makefile.std"}" ;;
-    esac
-}
-
-function ci_trace_build {
-    ci_info "## START OF CONFIGURATION ##"
-    ci_info "build arch: $CI_BUILD_ARCH"
-    ci_info "build system: $CI_BUILD_SYSTEM"
-    [[ "$CI_TARGET_SYSTEM.$CI_TARGET_ARCH" != "$CI_BUILD_SYSTEM.$CI_BUILD_ARCH" ]] && {
-        ci_info "target arch: $CI_TARGET_ARCH"
-        ci_info "target system: $CI_TARGET_SYSTEM"
-    }
-    ci_info "source directory: $CI_SRC_DIR"
-    ci_info "environment option: \$CI_MAKEFILES: '$CI_MAKEFILES'"
-    ci_info "environment option: \$CI_MAKE: '$CI_MAKE'"
-    ci_info "environment option: \$CI_MAKE_FLAGS: '$CI_MAKE_FLAGS'"
-    ci_info "environment option: \$CI_MAKE_VARS: '$CI_MAKE_VARS'"
-    ci_info "environment option: \$CI_CC: '$CI_CC'"
-    ci_info "environment option: \$CI_CC_FLAGS: '$CI_CC_FLAGS'"
-    ci_info "environment option: \$CI_CPP: '$CI_CPP'"
-    ci_info "environment option: \$CI_CPP_FLAGS: '$CI_CPP_FLAGS'"
-    ci_info "environment option: \$CI_AR: '$CI_AR'"
-    ci_info "environment option: \$CI_RANLIB: '$CI_RANLIB'"
-    ci_info "environment option: \$CI_LD: '$CI_LD'"
-    ci_info "environment option: \$CI_LD_FLAGS: '$CI_LD_FLAGS'"
-    ci_info "environment option: \$CI_LIBS: '$CI_LIBS'"
-    ci_info "environment option: \$CI_SANITIZERS: '$CI_SANITIZERS'"
-    ci_info "environment option: \$CI_FORCE: '$CI_FORCE'"
-    ci_info "environment option: \$CI_NO_BUILD: '$CI_NO_BUILD'"
-    ci_info "environment option: \$CI_NO_TEST: '$CI_NO_TEST'"
-    ci_info "environment option: \$CI_NO_CLEAN: '$CI_NO_CLEAN'"
-    ci_info "executable: \$CI_MAKE: $(command -V "$CI_MAKE")"
-    [[ $CI_CC ]] && {
-        ci_info "executable: \$CI_CC: $(command -V "$CI_CC")"
-    }
-    [[ $CI_CPP ]] && {
-        ci_info "executable: \$CI_CPP: $(command -V "$CI_CPP")"
-    }
-    [[ $CI_AR ]] && {
-        ci_info "executable: \$CI_AR: $(command -V "$CI_AR")"
-    }
-    [[ $CI_RANLIB ]] && {
-        ci_info "executable: \$CI_RANLIB: $(command -V "$CI_RANLIB")"
-    }
-    [[ $CI_LD ]] && {
-        ci_info "executable: \$CI_LD: $(command -V "$CI_LD")"
-    }
-    ci_info "## END OF CONFIGURATION ##"
-}
-
-function ci_cleanup_old_build {
-    # Any old makefile-based build will most likely leave a mess
-    # of object files behind if interrupted, e.g., via Ctrl+C.
-    # There may be other files behind, depending on what makefile
-    # had been used. We cannot easily enumerate all of those.
-    # Fortunately, for a clean makefiles-based build, it should be
-    # sufficient to remove the old object files only.
-    ci_info "## START OF PRE-BUILD CLEANUP ##"
-    local find_args=(-maxdepth 1 \( -iname "*.o" -o -iname "*.obj" \))
-    [[ ! $(find "$CI_SRC_DIR" "${find_args[@]}" | head -n1) ]] || {
-        ci_warn "unexpected build found in '$CI_SRC_DIR'"
-        if ci_expr $((CI_FORCE))
-        then
-            # Delete the old build.
-            local my_file
-            find "$CI_SRC_DIR" "${find_args[@]}" |
-                while IFS="" read -r my_file
-                do
-                    ci_spawn rm -fr "$my_file"
-                done
-            ci_info "## END OF PRE-BUILD CLEANUP ##"
-        else
-            # Alert the user, but do not delete their existing files,
-            # and do not mess up their existing build.
-            ci_info "hint: consider using the option \$CI_FORCE=1"
-            ci_err "unable to continue"
-        fi
-    }
-}
-
-function ci_build {
-    ci_info "## START OF BUILD ##"
-    # Initialize and populate the local arrays.
-    local all_make_flags=()
-    local all_make_vars=()
-    [[ $CI_MAKE_FLAGS ]] && {
-        all_make_flags+=($CI_MAKE_FLAGS)
-    }
-    [[ $CI_CC ]] && {
-        all_make_vars+=("CC=$CI_CC")
-    }
-    [[ $CI_CC_FLAGS || $CI_SANITIZERS ]] && {
-        [[ $CI_SANITIZERS ]] && CI_CC_FLAGS="${CI_CC_FLAGS:-"-O2"} -fsanitize=$CI_SANITIZERS"
-        all_make_vars+=("CFLAGS=$CI_CC_FLAGS")
-    }
-    [[ $CI_CPP ]] && {
-        all_make_vars+=("CPP=$CI_CPP")
-    }
-    [[ $CI_CPP_FLAGS ]] && {
-        all_make_vars+=("CPPFLAGS=$CI_CPP_FLAGS")
-    }
-    [[ $CI_AR ]] && {
-        all_make_vars+=("AR=$CI_AR")
-    }
-    [[ $CI_RANLIB ]] && {
-        all_make_vars+=("RANLIB=$CI_RANLIB")
-    }
-    [[ $CI_LD ]] && {
-        all_make_vars+=("LD=$CI_LD")
-    }
-    [[ $CI_LD_FLAGS || $CI_SANITIZERS ]] && {
-        [[ $CI_SANITIZERS ]] && CI_LD_FLAGS+="${CI_LD_FLAGS:+" "}-fsanitize=$CI_SANITIZERS"
-        all_make_vars+=("LDFLAGS=$CI_LD_FLAGS")
-    }
-    [[ $CI_LIBS ]] && {
-        all_make_vars+=("LIBS=$CI_LIBS")
-    }
-    all_make_vars+=($CI_MAKE_VARS)
-    # And... build!
-    local my_makefile
-    for my_makefile in $CI_MAKEFILES
-    do
-        ci_info "using makefile: $my_makefile"
-        ci_expr $((CI_NO_BUILD)) || {
-            # Spawn "make".
-            ci_spawn "$CI_MAKE" -f "$my_makefile" \
-                                "${all_make_flags[@]}" \
-                                "${all_make_vars[@]}"
-        }
-        ci_expr $((CI_NO_TEST)) || {
-            # Spawn "make test" if testing is not disabled.
-            ci_spawn "$CI_MAKE" -f "$my_makefile" \
-                                "${all_make_flags[@]}" \
-                                "${all_make_vars[@]}" \
-                                test
-        }
-        ci_expr $((CI_NO_CLEAN)) || {
-            # Spawn "make clean" if cleaning is not disabled.
-            ci_spawn "$CI_MAKE" -f "$my_makefile" \
-                                "${all_make_flags[@]}" \
-                                "${all_make_vars[@]}" \
-                                clean
-        }
-    done
-    ci_info "## END OF BUILD ##"
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>]"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    # And... go!
-    ci_init_build
-    ci_trace_build
-    [[ $# -eq 0 ]] || {
-        echo >&2 "error: unexpected argument: '$1'"
-        echo >&2 "note: this program accepts environment options only"
-        usage 2
-    }
-    ci_cleanup_old_build
-    ci_build
-}
-
-main "$@"

ci/ci_verify_version.sh

@@ -1,191 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/lib/ci.lib.sh"
-cd "$CI_TOPLEVEL_DIR"
-
-# Declare the global environments collected from various sources.
-declare CI_ENV_LIBPNG_VER        # collected from png.h
-declare CI_ENV_AUTOCONF_VER      # collected from configure.ac
-declare CI_ENV_CMAKE_VER         # collected from CMakeLists.txt
-declare CI_ENV_LIBPNGCONFIG_VER  # collected from scripts/libpng-config-head.in
-
-function ci_run_shellify {
-    local my_script my_result
-    my_script="$CI_SCRIPT_DIR/libexec/ci_shellify_${1#--}.sh"
-    shift 1
-    [[ -f $my_script ]] || {
-        ci_err_internal "missing script: '$my_script'"
-    }
-    ci_info "shellifying:" "$@"
-    "$BASH" "$my_script" "$@"
-    echo "$my_result" | "$BASH" --posix || ci_err "bad shellify output"
-    echo "$my_result"
-}
-
-function ci_init_version_verification {
-    ci_info "## START OF VERIFICATION ##"
-    CI_ENV_LIBPNG_VER="$(ci_run_shellify --c png.h)"
-    echo "$CI_ENV_LIBPNG_VER"
-    CI_ENV_AUTOCONF_VER="$(ci_run_shellify --autoconf configure.ac)"
-    echo "$CI_ENV_AUTOCONF_VER"
-    CI_ENV_CMAKE_VER="$(ci_run_shellify --cmake CMakeLists.txt)"
-    echo "$CI_ENV_CMAKE_VER"
-    CI_ENV_LIBPNGCONFIG_VER="$(ci_run_shellify --shell scripts/libpng-config-head.in)"
-    echo "$CI_ENV_LIBPNGCONFIG_VER"
-}
-
-# shellcheck disable=SC2154
-function ci_do_version_verification {
-    local my_expect
-    ci_info "## VERIFYING: version definitions in 'png.h' ##"
-    eval "$CI_ENV_LIBPNG_VER"
-    my_expect="${PNG_LIBPNG_VER_MAJOR}.${PNG_LIBPNG_VER_MINOR}.${PNG_LIBPNG_VER_RELEASE}"
-    if [[ "$PNG_LIBPNG_VER_STRING" == "$my_expect"* ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER_STRING == $my_expect*"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER_STRING != $my_expect*"
-    fi
-    my_expect=$((PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE))
-    if [[ "$PNG_LIBPNG_VER" == "$my_expect" ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER == $my_expect"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER != $my_expect"
-    fi
-    my_expect=$((PNG_LIBPNG_VER_MAJOR*10 + PNG_LIBPNG_VER_MINOR))
-    if [[ "$PNG_LIBPNG_VER_SHAREDLIB" == "$my_expect" ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER_SHAREDLIB == $my_expect"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER_SHAREDLIB != $my_expect"
-    fi
-    if [[ "$PNG_LIBPNG_VER_SONUM" == "$my_expect" ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER_SONUM == $my_expect"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER_SONUM != $my_expect"
-    fi
-    if [[ "$PNG_LIBPNG_VER_DLLNUM" == "$my_expect" ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER_DLLNUM == $my_expect"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER_DLLNUM != $my_expect"
-    fi
-    if [[ "$PNG_LIBPNG_VER_BUILD" == [01] ]]
-    then
-        ci_info "matched: \$PNG_LIBPNG_VER_BUILD == [01]"
-    else
-        ci_err "mismatched: \$PNG_LIBPNG_VER_BUILD != [01]"
-    fi
-    ci_info "## VERIFYING: build definitions in 'png.h' ##"
-    my_expect="${PNG_LIBPNG_VER_MAJOR}.${PNG_LIBPNG_VER_MINOR}.${PNG_LIBPNG_VER_RELEASE}"
-    if [[ "$PNG_LIBPNG_VER_STRING" == "$my_expect" ]]
-    then
-        if [[ $PNG_LIBPNG_VER_BUILD -eq 0 ]]
-        then
-            ci_info "matched: \$PNG_LIBPNG_VER_BUILD -eq 0"
-        else
-            ci_err "mismatched: \$PNG_LIBPNG_VER_BUILD -ne 0"
-        fi
-        if [[ $PNG_LIBPNG_BUILD_BASE_TYPE -eq $PNG_LIBPNG_BUILD_STABLE ]]
-        then
-            ci_info "matched: \$PNG_LIBPNG_BUILD_BASE_TYPE -eq \$PNG_LIBPNG_BUILD_STABLE"
-        else
-            ci_err "mismatched: \$PNG_LIBPNG_BUILD_BASE_TYPE -ne \$PNG_LIBPNG_BUILD_STABLE"
-        fi
-    elif [[ "$PNG_LIBPNG_VER_STRING" == "$my_expect".git ]]
-    then
-        if [[ $PNG_LIBPNG_VER_BUILD -ne 0 ]]
-        then
-            ci_info "matched: \$PNG_LIBPNG_VER_BUILD -ne 0"
-        else
-            ci_err "mismatched: \$PNG_LIBPNG_VER_BUILD -eq 0"
-        fi
-        if [[ $PNG_LIBPNG_BUILD_BASE_TYPE -ne $PNG_LIBPNG_BUILD_STABLE ]]
-        then
-            ci_info "matched: \$PNG_LIBPNG_BUILD_BASE_TYPE -ne \$PNG_LIBPNG_BUILD_STABLE"
-        else
-            ci_err "mismatched: \$PNG_LIBPNG_BUILD_BASE_TYPE -eq \$PNG_LIBPNG_BUILD_STABLE"
-        fi
-    else
-        ci_err "unexpected: \$PNG_LIBPNG_VER_STRING == '$PNG_LIBPNG_VER_STRING'"
-    fi
-    ci_info "## VERIFYING: type definitions in 'png.h' ##"
-    my_expect="$(echo "png_libpng_version_${PNG_LIBPNG_VER_STRING}" | tr . _)"
-    ci_spawn grep -w -e "$my_expect" png.h
-    ci_info "## VERIFYING: version definitions in 'configure.ac' ##"
-    eval "$CI_ENV_AUTOCONF_VER"
-    if [[ "$PNGLIB_VERSION" == "$PNG_LIBPNG_VER_STRING" ]]
-    then
-        ci_info "matched: \$PNGLIB_VERSION == \$PNG_LIBPNG_VER_STRING"
-    else
-        ci_err "mismatched: \$PNGLIB_VERSION != \$PNG_LIBPNG_VER_STRING"
-    fi
-    ci_info "## VERIFYING: version definitions in 'CMakeLists.txt' ##"
-    eval "$CI_ENV_CMAKE_VER"
-    if [[ "$PNGLIB_VERSION" == "$PNG_LIBPNG_VER_STRING" && "$PNGLIB_SUBREVISION" == 0 ]]
-    then
-        ci_info "matched: \$PNGLIB_VERSION == \$PNG_LIBPNG_VER_STRING"
-        ci_info "matched: \$PNGLIB_SUBREVISION == 0"
-    elif [[ "$PNGLIB_VERSION.$PNGLIB_SUBREVISION" == "$PNG_LIBPNG_VER_STRING" ]]
-    then
-        ci_info "matched: \$PNGLIB_VERSION.\$PNGLIB_SUBREVISION == \$PNG_LIBPNG_VER_STRING"
-    else
-        ci_err "mismatched: \$PNGLIB_VERSION != \$PNG_LIBPNG_VER_STRING"
-    fi
-    ci_info "## VERIFYING: version definitions in 'scripts/libpng-config-head.in' ##"
-    eval "$CI_ENV_LIBPNGCONFIG_VER"
-    if [[ "$version" == "$PNG_LIBPNG_VER_STRING" ]]
-    then
-        ci_info "matched: \$version == \$PNG_LIBPNG_VER_STRING"
-    else
-        ci_err "mismatched: \$version != \$PNG_LIBPNG_VER_STRING"
-    fi
-}
-
-function ci_finish_version_verification {
-    ci_info "## END OF VERIFICATION ##"
-    # Relying on "set -o errexit" to not reach here in case of error.
-    ci_info "## SUCCESS ##"
-}
-
-function ci_verify_version {
-    ci_init_version_verification
-    ci_do_version_verification
-    ci_finish_version_verification
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>]"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] || {
-        echo >&2 "error: unexpected argument: '$1'"
-        usage 2
-    }
-    # And... go!
-    ci_verify_version
-}
-
-main "$@"

ci/lib/ci.lib.sh

@@ -1,111 +0,0 @@
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-test -f "$BASH_SOURCE" || {
-    echo >&2 "warning: this module requires Bash version 3 or newer"
-}
-test "${#BASH_SOURCE[@]}" -gt 1 || {
-    echo >&2 "warning: this module should be sourced from a Bash script"
-}
-
-# Reset the locale to avoid surprises from locale-dependent commands.
-export LC_ALL=C
-export LANG=C
-export LANGUAGE=C
-
-# Reset CDPATH to avoid surprises from the "cd" command.
-export CDPATH=""
-
-# Initialize the global constants CI_SCRIPT_{NAME,DIR} and CI_TOPLEVEL_DIR.
-CI_SCRIPT_NAME="$(basename -- "$0")"
-CI_SCRIPT_DIR="$(cd "$(dirname -- "$0")" && pwd)"
-CI_TOPLEVEL_DIR="$(cd "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
-
-# Initialize the global constants CI_BUILD_{...} for the host build platform.
-CI_BUILD_ARCH="${CI_BUILD_ARCH:-"$(uname -m | tr 'A-Z/\.-' 'a-z____')"}"
-CI_BUILD_SYSTEM="${CI_BUILD_SYSTEM:-"$(uname -s | tr 'A-Z/\.-' 'a-z____')"}"
-
-# Initialize the global constants CI_TARGET_{...} for the target platform.
-CI_TARGET_ARCH="${CI_TARGET_ARCH:-"$CI_BUILD_ARCH"}"
-CI_TARGET_SYSTEM="${CI_TARGET_SYSTEM:-"$CI_BUILD_SYSTEM"}"
-
-function ci_info {
-    printf >&2 "%s: %s\\n" "$CI_SCRIPT_NAME" "$*"
-}
-
-function ci_warn {
-    printf >&2 "%s: warning: %s\\n" "$CI_SCRIPT_NAME" "$*"
-}
-
-function ci_err {
-    printf >&2 "%s: error: %s\\n" "$CI_SCRIPT_NAME" "$*"
-    exit 2
-}
-
-function ci_err_internal {
-    printf >&2 "%s: internal error: %s\\n" "$CI_SCRIPT_NAME" "$*"
-    printf >&2 "ABORTED\\n"
-    # Exit with the conventional SIGABRT code.
-    exit 134
-}
-
-function ci_expr {
-    if [[ ${*:-0} == [0-9] ]]
-    then
-        # This is the same as in the else-branch below, albeit much faster
-        # for our intended use cases.
-        return $((!$1))
-    else
-        # The funny-looking compound command "... && return $? || return $?"
-        # allows the execution to continue uninterrupted under "set -e".
-        expr >/dev/null "$@" && return $? || return $?
-    fi
-}
-
-function ci_spawn {
-    printf >&2 "%s: executing:" "$CI_SCRIPT_NAME"
-    printf >&2 " %q" "$@"
-    printf >&2 "\\n"
-    "$@"
-}
-
-# Ensure that the internal initialization is correct.
-[[ $CI_TOPLEVEL_DIR/ci/lib/ci.lib.sh -ef ${BASH_SOURCE[0]} ]] || {
-    ci_err_internal "bad or missing \$CI_TOPLEVEL_DIR"
-}
-[[ $CI_SCRIPT_DIR/$CI_SCRIPT_NAME -ef $0 ]] || {
-    ci_err_internal "bad or missing \$CI_SCRIPT_DIR/\$CI_SCRIPT_NAME"
-}
-[[ $CI_BUILD_ARCH && $CI_BUILD_SYSTEM ]] || {
-    ci_err_internal "missing \$CI_BUILD_ARCH or \$CI_BUILD_SYSTEM"
-}
-[[ $CI_TARGET_ARCH && $CI_TARGET_SYSTEM ]] || {
-    ci_err_internal "missing \$CI_TARGET_ARCH or \$CI_TARGET_SYSTEM"
-}
-
-# Ensure that the user initialization is correct.
-[[ ${CI_FORCE:-0} == [01] ]] || {
-    ci_err "bad boolean option: \$CI_FORCE: '$CI_FORCE'"
-}
-[[ ${CI_NO_BUILD:-0} == [01] ]] || {
-    ci_err "bad boolean option: \$CI_NO_BUILD: '$CI_NO_BUILD'"
-}
-[[ ${CI_NO_TEST:-0} == [01] ]] || {
-    ci_err "bad boolean option: \$CI_NO_TEST: '$CI_NO_TEST'"
-}
-[[ ${CI_NO_INSTALL:-0} == [01] ]] || {
-    ci_err "bad boolean option: \$CI_NO_INSTALL: '$CI_NO_INSTALL'"
-}
-[[ ${CI_NO_CLEAN:-0} == [01] ]] || {
-    ci_err "bad boolean option: \$CI_NO_CLEAN: '$CI_NO_CLEAN'"
-}
-if ci_expr $((CI_NO_BUILD))
-then
-    ci_expr $((CI_NO_TEST && CI_NO_INSTALL)) || {
-        ci_err "\$CI_NO_BUILD requires \$CI_NO_TEST and \$CI_NO_INSTALL"
-    }
-fi

ci/libexec/ci_shellify_autoconf.sh

@@ -1,48 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/../lib/ci.lib.sh"
-
-function ci_shellify_autoconf {
-    # Convert autoconf (M4) text, specifically originating
-    # from configure.ac, to shell scripting text.
-    # Select only the easy-to-parse definitions of PNGLIB_*.
-    sed -n -e '/^ *PNGLIB_[^ ]*=[$"0-9A-Za-z_]/ p' |
-        sed -e 's/^ *PNG\([0-9A-Za-z_]*\)=\([^# ]*\).*$/PNG\1=\2/' \
-            -e 's/^\([^ ]*=[^ ]*\).*$/export \1;/'
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>] configure.ac"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] && usage 2
-    [[ $# -eq 1 ]] || ci_err "too many operands"
-    # And... go!
-    test -e "$1" || ci_err "no such file: '$1'"
-    [[ $(basename -- "$1") == configure.ac ]] || {
-        ci_err "incorrect operand: '$1' (expecting: 'configure.ac')"
-    }
-    ci_shellify_autoconf <"$1"
-}
-
-main "$@"

ci/libexec/ci_shellify_c.sh

@@ -1,49 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/../lib/ci.lib.sh"
-
-function ci_shellify_c {
-    # Convert C preprocessor text, specifically originating
-    # from png.h, to shell scripting text.
-    # Select only the easy-to-parse definitions of PNG_LIBPNG_*.
-    sed -n -e '/^\# *define * PNG_LIBPNG_[^ ]* * ["0-9A-Za-z_]/ p' |
-        sed -e 's/^\# *define * PNG\([^ ]*\) * \([^ ]*\)/PNG\1=\2/' \
-            -e 's/=PNG\([0-9A-Za-z_]*\)/=\${PNG\1}/' \
-            -e 's/^\([^ ]*=[^ ]*\).*$/export \1;/'
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>] png.h"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] && usage 2
-    [[ $# -eq 1 ]] || ci_err "too many operands"
-    # And... go!
-    test -e "$1" || ci_err "no such file: '$1'"
-    [[ $(basename -- "$1") == png.h ]] || {
-        ci_err "incorrect operand: '$1' (expecting: 'png.h')"
-    }
-    ci_shellify_c <"$1"
-}
-
-main "$@"

ci/libexec/ci_shellify_cmake.sh

@@ -1,49 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/../lib/ci.lib.sh"
-
-function ci_shellify_cmake {
-    # Convert CMake lists text, specifically originating
-    # from CMakeLists.txt, to shell scripting text.
-    # Select only the easy-to-parse definitions of PNGLIB_*.
-    sed -n -e '/^ *set *(PNGLIB_[^ ]* * [$"0-9A-Za-z_].*)/ p' |
-        sed -e 's/^ *set *(PNG\([^ ]*\) * \([^() ]*\)).*$/PNG\1=\2/' \
-            -e 's/^\([^ ]*=[^ ]*\).*$/export \1;/'
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>] CMakeLists.txt"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] && usage 2
-    [[ $# -eq 1 ]] || ci_err "too many operands"
-    # And... go!
-    test -e "$1" || ci_err "no such file: '$1'"
-    filename="$(basename -- "$1")"
-    [[ $filename == [Cc][Mm]ake[Ll]ists.txt ]] || {
-        ci_err "incorrect operand: '$1' (expecting: 'CMakeLists.txt')"
-    }
-    ci_shellify_cmake <"$1"
-}
-
-main "$@"

ci/libexec/ci_shellify_shell.sh

@@ -1,46 +0,0 @@
-#!/usr/bin/env bash
-set -o errexit -o pipefail -o posix
-
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-# shellcheck source=ci/lib/ci.lib.sh
-source "$(dirname "$0")/../lib/ci.lib.sh"
-
-function ci_shellify_shell {
-    # Convert shell scripting text to shell scripting text.
-    # Select only the easy-to-parse version definitions.
-    sed -n -e '/^ *[A-Za-z_][0-9A-Za-z_]*=[0-9][^ #]* *$/ p' |
-        sed -e 's/^ *\([^ ]*=[^ ]*\) *$/export \1;/'
-}
-
-function usage {
-    echo "usage: $CI_SCRIPT_NAME [<options>] libpng-config-head.in"
-    echo "options: -?|-h|--help"
-    exit "${@:-0}"
-}
-
-function main {
-    local opt
-    while getopts ":" opt
-    do
-        # This ain't a while-loop. It only pretends to be.
-        [[ $1 == -[?h]* || $1 == --help || $1 == --help=* ]] && usage 0
-        ci_err "unknown option: '$1'"
-    done
-    shift $((OPTIND - 1))
-    [[ $# -eq 0 ]] && usage 2
-    [[ $# -eq 1 ]] || ci_err "too many operands"
-    # And... go!
-    test -e "$1" || ci_err "no such file: '$1'"
-    [[ $(basename -- "$1") == libpng-config-head.in ]] || {
-        ci_err "incorrect operand: '$1' (expecting: 'libpng-config-head.in')"
-    }
-    ci_shellify_shell <"$1"
-}
-
-main "$@"

ci/targets/android/ci_env.aarch64-linux-android.sh

@@ -1,16 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=aarch64
-export CI_TARGET_ARCHVER=aarch64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=android
-export CI_TARGET_ABIVER=android29
-
-export CI_CC="$CI_TARGET_ARCHVER-$CI_TARGET_SYSTEM-$CI_TARGET_ABIVER-clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"

ci/targets/android/ci_env.armv7a-linux-androideabi.sh

@@ -1,16 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=arm
-export CI_TARGET_ARCHVER=armv7a
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=androideabi
-export CI_TARGET_ABIVER=androideabi29
-
-export CI_CC="$CI_TARGET_ARCHVER-$CI_TARGET_SYSTEM-$CI_TARGET_ABIVER-clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"

ci/targets/android/ci_env.i686-linux-android.sh

@@ -1,16 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_ARCHVER=i686
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=android
-export CI_TARGET_ABIVER=android29
-
-export CI_CC="$CI_TARGET_ARCHVER-$CI_TARGET_SYSTEM-$CI_TARGET_ABIVER-clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"

ci/targets/android/ci_env.x86_64-linux-android.sh

@@ -1,16 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_ARCHVER=x86_64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=android
-export CI_TARGET_ABIVER=android29
-
-export CI_CC="$CI_TARGET_ARCHVER-$CI_TARGET_SYSTEM-$CI_TARGET_ABIVER-clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"

ci/targets/cygwin/ci_env.i686-pc-cygwin.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_SYSTEM=cygwin
-
-export CI_CC="$CI_TARGET_ARCH-pc-$CI_TARGET_SYSTEM-gcc"
-export CI_AR="$CI_CC-ar"
-export CI_RANLIB="$CI_CC-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=CYGWIN
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/cygwin/ci_env.x86_64-pc-cygwin.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=cygwin
-
-export CI_CC="$CI_TARGET_ARCH-pc-$CI_TARGET_SYSTEM-gcc"
-export CI_AR="$CI_CC-ar"
-export CI_RANLIB="$CI_CC-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=CYGWIN
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/darwin/ci_env.arm64-apple-darwin.sh

@@ -1,15 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=arm64
-export CI_TARGET_SYSTEM=darwin
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Darwin
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-    -DCMAKE_OSX_ARCHITECTURES=$CI_TARGET_ARCH
-"

ci/targets/darwin/ci_env.x86_64-apple-darwin.sh

@@ -1,15 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=darwin
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Darwin
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-    -DCMAKE_OSX_ARCHITECTURES=$CI_TARGET_ARCH
-"

ci/targets/freebsd/ci_env.aarch64-unknown-freebsd.sh

@@ -1,14 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=aarch64
-export CI_TARGET_SYSTEM=freebsd
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=FreeBSD
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/freebsd/ci_env.i686-unknown-freebsd.sh

@@ -1,14 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_SYSTEM=freebsd
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=FreeBSD
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/freebsd/ci_env.riscv64-unknown-freebsd.sh

@@ -1,14 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=riscv64
-export CI_TARGET_SYSTEM=freebsd
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=FreeBSD
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/freebsd/ci_env.x86_64-unknown-freebsd.sh

@@ -1,14 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=freebsd
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=FreeBSD
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.aarch64-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=aarch64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.arm-linux-gnueabi.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=arm
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnueabi
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.arm-linux-gnueabihf.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=arm
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnueabihf
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.i686-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mips-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mips
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mips64-linux-gnuabi64.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mips64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnuabi64
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mips64el-linux-gnuabi64.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mips64el
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnuabi64
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mipsel-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mipsel
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mipsisa32r6-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mipsisa32r6
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mipsisa32r6el-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mipsisa32r6el
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mipsisa64r6-linux-gnuabi64.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mipsisa64r6
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnuabi64
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.mipsisa64r6el-linux-gnuabi64.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=mipsisa64r6el
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnuabi64
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.powerpc-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=powerpc
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.powerpc64-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=powerpc64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.powerpc64le-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=powerpc64le
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.riscv64-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=riscv64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/linux/ci_env.x86_64-linux-gnu.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=linux
-export CI_TARGET_ABI=gnu
-
-export CI_GCC="${CI_GCC-gcc}"
-
-export CI_CC="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-$CI_GCC"
-export CI_AR="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ar"
-export CI_RANLIB="$CI_TARGET_ARCH-$CI_TARGET_SYSTEM-$CI_TARGET_ABI-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Linux
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/msdos/ci_env.i386-pc-msdoswatcom.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i386
-export CI_TARGET_SYSTEM=msdoswatcom
-
-export CI_CC="wcl386"
-
-# Open Watcom V2 CMake build
-# https://github.com/open-watcom/open-watcom-v2/discussions/716
-export CI_CMAKE_GENERATOR="Watcom WMake"
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=DOS
-"

ci/targets/msdos/ci_env.i586-pc-msdosdjgpp.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i586
-export CI_TARGET_SYSTEM=msdosdjgpp
-
-export CI_CC="$CI_TARGET_ARCH-pc-$CI_TARGET_SYSTEM-gcc"
-export CI_AR="$CI_CC-ar"
-export CI_RANLIB="$CI_CC-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Generic
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/msdos/ci_env.i86-pc-msdoswatcom.sh

@@ -1,19 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i86
-export CI_TARGET_SYSTEM=msdoswatcom
-
-export CI_CC="wcl"
-
-# Open Watcom V2 CMake build
-# https://github.com/open-watcom/open-watcom-v2/discussions/716
-export CI_CMAKE_GENERATOR="Watcom WMake"
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=DOS
-    -DCMAKE_SYSTEM_PROCESSOR=I86
-"

ci/targets/windows/ci_env.aarch64-windows-llvm.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=aarch64
-export CI_TARGET_SYSTEM=windows
-
-export CI_CC="clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Windows
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/windows/ci_env.i686-w64-mingw32.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_SYSTEM=mingw32
-
-# The output of `uname -s` on MSYS2 is understandable, and so is
-# CI_TARGET_SYSTEM above, in simplified form. (See also Cygwin.)
-# But aside from that, the Mingw-w64 nomenclature is rather messy.
-export CI_CC="$CI_TARGET_ARCH-w64-mingw32-gcc"
-export CI_AR="$CI_CC-ar"
-export CI_RANLIB="$CI_CC-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Windows
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/windows/ci_env.i686-windows-llvm.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=i686
-export CI_TARGET_SYSTEM=windows
-
-export CI_CC="clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Windows
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/windows/ci_env.x86_64-w64-mingw32.sh

@@ -1,21 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=mingw64
-
-# The output of `uname -s` on MSYS2 is understandable, and so is
-# CI_TARGET_SYSTEM above, in simplified form. (See also Cygwin.)
-# But aside from that, the Mingw-w64 nomenclature is rather messy.
-export CI_CC="$CI_TARGET_ARCH-w64-mingw32-gcc"
-export CI_AR="$CI_CC-ar"
-export CI_RANLIB="$CI_CC-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Windows
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

ci/targets/windows/ci_env.x86_64-windows-llvm.sh

@@ -1,18 +0,0 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
-# SPDX-License-Identifier: MIT
-
-export CI_TARGET_ARCH=x86_64
-export CI_TARGET_SYSTEM=windows
-
-export CI_CC="clang"
-export CI_AR="llvm-ar"
-export CI_RANLIB="llvm-ranlib"
-
-export CI_CMAKE_VARS="
-    -DCMAKE_SYSTEM_NAME=Windows
-    -DCMAKE_SYSTEM_PROCESSOR=$CI_TARGET_ARCH
-"

compile

@@ -1,364 +0,0 @@
-#! /bin/sh
-# Wrapper for compilers which do not understand '-c -o'.
-
-scriptversion=2025-06-18.21; # UTC
-
-# Copyright (C) 1999-2025 Free Software Foundation, Inc.
-# Written by Tom Tromey <tromey@cygnus.com>.
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-# As a special exception to the GNU General Public License, if you
-# distribute this file as part of a program that contains a
-# configuration script generated by Autoconf, you may include it under
-# the same distribution terms that you use for the rest of that program.
-
-# This file is maintained in Automake, please report
-# bugs to <bug-automake@gnu.org> or send patches to
-# <automake-patches@gnu.org>.
-
-nl='
-'
-
-# We need space, tab and new line, in precisely that order.  Quoting is
-# there to prevent tools from complaining about whitespace usage.
-IFS=" ""	$nl"
-
-file_conv=
-
-# func_file_conv build_file unneeded_conversions
-# Convert a $build file to $host form and store it in $file
-# Currently only supports Windows hosts. If the determined conversion
-# type is listed in (the comma separated) UNNEEDED_CONVERSIONS, no
-# conversion will take place.
-func_file_conv ()
-{
-  file=$1
-  case $file in
-    / | /[!/]*) # absolute file, and not a UNC file
-      if test -z "$file_conv"; then
-	# lazily determine how to convert abs files
-	case `uname -s` in
-	  MINGW*)
-	    if test -n "$MSYSTEM" && (cygpath --version) >/dev/null 2>&1; then
-	      # MSYS2 environment.
-	      file_conv=cygwin
-	    else
-	      # Original MinGW environment.
-	      file_conv=mingw
-	    fi
-	    ;;
-	  MSYS*)
-	    # Old MSYS environment, or MSYS2 with 32-bit MSYS2 shell.
-	    file_conv=cygwin
-	    ;;
-	  CYGWIN*)
-	    # Cygwin environment.
-	    file_conv=cygwin
-	    ;;
-	  *)
-	    file_conv=wine
-	    ;;
-	esac
-      fi
-      case $file_conv/,$2, in
-	*,$file_conv,*)
-	  # This is the optimization mentioned above:
-	  # If UNNEEDED_CONVERSIONS contains $file_conv, don't convert.
-	  ;;
-	mingw/*)
-	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
-	  ;;
-	cygwin/*)
-	  file=`cygpath -w "$file" || echo "$file"`
-	  ;;
-	wine/*)
-	  file=`winepath -w "$file" || echo "$file"`
-	  ;;
-      esac
-      ;;
-  esac
-}
-
-# func_cl_dashL linkdir
-# Make cl look for libraries in LINKDIR
-func_cl_dashL ()
-{
-  func_file_conv "$1"
-  if test -z "$lib_path"; then
-    lib_path=$file
-  else
-    lib_path="$lib_path;$file"
-  fi
-  linker_opts="$linker_opts -LIBPATH:$file"
-}
-
-# func_cl_dashl library
-# Do a library search-path lookup for cl
-func_cl_dashl ()
-{
-  lib=$1
-  found=no
-  save_IFS=$IFS
-  IFS=';'
-  for dir in $lib_path $LIB
-  do
-    IFS=$save_IFS
-    if $shared && test -f "$dir/$lib.dll.lib"; then
-      found=yes
-      lib=$dir/$lib.dll.lib
-      break
-    fi
-    if test -f "$dir/$lib.lib"; then
-      found=yes
-      lib=$dir/$lib.lib
-      break
-    fi
-    if test -f "$dir/lib$lib.a"; then
-      found=yes
-      lib=$dir/lib$lib.a
-      break
-    fi
-  done
-  IFS=$save_IFS
-
-  if test "$found" != yes; then
-    lib=$lib.lib
-  fi
-}
-
-# func_cl_wrapper cl arg...
-# Adjust compile command to suit cl
-func_cl_wrapper ()
-{
-  # Assume a capable shell
-  lib_path=
-  shared=:
-  linker_opts=
-  for arg
-  do
-    if test -n "$eat"; then
-      eat=
-    else
-      case $1 in
-	-o)
-	  # configure might choose to run compile as 'compile cc -o foo foo.c'.
-	  eat=1
-	  case $2 in
-	    *.o | *.lo | *.[oO][bB][jJ])
-	      func_file_conv "$2"
-	      set x "$@" -Fo"$file"
-	      shift
-	      ;;
-	    *)
-	      func_file_conv "$2"
-	      set x "$@" -Fe"$file"
-	      shift
-	      ;;
-	  esac
-	  ;;
-	-I)
-	  eat=1
-	  func_file_conv "$2" mingw
-	  set x "$@" -I"$file"
-	  shift
-	  ;;
-	-I*)
-	  func_file_conv "${1#-I}" mingw
-	  set x "$@" -I"$file"
-	  shift
-	  ;;
-	-l)
-	  eat=1
-	  func_cl_dashl "$2"
-	  set x "$@" "$lib"
-	  shift
-	  ;;
-	-l*)
-	  func_cl_dashl "${1#-l}"
-	  set x "$@" "$lib"
-	  shift
-	  ;;
-	-L)
-	  eat=1
-	  func_cl_dashL "$2"
-	  ;;
-	-L*)
-	  func_cl_dashL "${1#-L}"
-	  ;;
-	-static)
-	  shared=false
-	  ;;
-	-Wl,*)
-	  arg=${1#-Wl,}
-	  save_ifs="$IFS"; IFS=','
-	  for flag in $arg; do
-	    IFS="$save_ifs"
-	    linker_opts="$linker_opts $flag"
-	  done
-	  IFS="$save_ifs"
-	  ;;
-	-Xlinker)
-	  eat=1
-	  linker_opts="$linker_opts $2"
-	  ;;
-	-*)
-	  set x "$@" "$1"
-	  shift
-	  ;;
-	*.cc | *.CC | *.cxx | *.CXX | *.[cC]++)
-	  func_file_conv "$1"
-	  set x "$@" -Tp"$file"
-	  shift
-	  ;;
-	*.c | *.cpp | *.CPP | *.lib | *.LIB | *.Lib | *.OBJ | *.obj | *.[oO])
-	  func_file_conv "$1" mingw
-	  set x "$@" "$file"
-	  shift
-	  ;;
-	*)
-	  set x "$@" "$1"
-	  shift
-	  ;;
-      esac
-    fi
-    shift
-  done
-  if test -n "$linker_opts"; then
-    linker_opts="-link$linker_opts"
-  fi
-  exec "$@" $linker_opts
-  exit 1
-}
-
-eat=
-
-case $1 in
-  '')
-     echo "$0: No command.  Try '$0 --help' for more information." 1>&2
-     exit 1;
-     ;;
-  -h | --h*)
-    cat <<\EOF
-Usage: compile [--help] [--version] PROGRAM [ARGS]
-
-Wrapper for compilers which do not understand '-c -o'.
-Remove '-o dest.o' from ARGS, run PROGRAM with the remaining
-arguments, and rename the output as expected.
-
-If you are trying to build a whole package this is not the
-right script to run: please start by reading the file 'INSTALL'.
-
-Report bugs to <bug-automake@gnu.org>.
-GNU Automake home page: <https://www.gnu.org/software/automake/>.
-General help using GNU software: <https://www.gnu.org/gethelp/>.
-EOF
-    exit $?
-    ;;
-  -v | --v*)
-    echo "compile (GNU Automake) $scriptversion"
-    exit $?
-    ;;
-  cl | *[/\\]cl | cl.exe | *[/\\]cl.exe | \
-  clang-cl | *[/\\]clang-cl | clang-cl.exe | *[/\\]clang-cl.exe | \
-  icl | *[/\\]icl | icl.exe | *[/\\]icl.exe )
-    func_cl_wrapper "$@"      # Doesn't return...
-    ;;
-esac
-
-ofile=
-cfile=
-
-for arg
-do
-  if test -n "$eat"; then
-    eat=
-  else
-    case $1 in
-      -o)
-	# configure might choose to run compile as 'compile cc -o foo foo.c'.
-	# So we strip '-o arg' only if arg is an object.
-	eat=1
-	case $2 in
-	  *.o | *.obj)
-	    ofile=$2
-	    ;;
-	  *)
-	    set x "$@" -o "$2"
-	    shift
-	    ;;
-	esac
-	;;
-      *.c)
-	cfile=$1
-	set x "$@" "$1"
-	shift
-	;;
-      *)
-	set x "$@" "$1"
-	shift
-	;;
-    esac
-  fi
-  shift
-done
-
-if test -z "$ofile" || test -z "$cfile"; then
-  # If no '-o' option was seen then we might have been invoked from a
-  # pattern rule where we don't need one.  That is ok -- this is a
-  # normal compilation that the losing compiler can handle.  If no
-  # '.c' file was seen then we are probably linking.  That is also
-  # ok.
-  exec "$@"
-fi
-
-# Name of file we expect compiler to create.
-cofile=`echo "$cfile" | sed 's|^.*[\\/]||; s|^[a-zA-Z]:||; s/\.c$/.o/'`
-
-# Create the lock directory.
-# Note: use '[/\\:.-]' here to ensure that we don't use the same name
-# that we are using for the .o file.  Also, base the name on the expected
-# object file name, since that is what matters with a parallel build.
-lockdir=`echo "$cofile" | sed -e 's|[/\\:.-]|_|g'`.d
-while true; do
-  if mkdir "$lockdir" >/dev/null 2>&1; then
-    break
-  fi
-  sleep 1
-done
-# FIXME: race condition here if user kills between mkdir and trap.
-trap "rmdir '$lockdir'; exit 1" 1 2 15
-
-# Run the compile.
-"$@"
-ret=$?
-
-if test -f "$cofile"; then
-  test "$cofile" = "$ofile" || mv "$cofile" "$ofile"
-elif test -f "${cofile}bj"; then
-  test "${cofile}bj" = "$ofile" || mv "${cofile}bj" "$ofile"
-fi
-
-rmdir "$lockdir"
-exit $ret
-
-# Local Variables:
-# mode: shell-script
-# 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-time-zone: "UTC0"
-# time-stamp-end: "; # UTC"
-# End:

config.h.in

@@ -1,138 +0,0 @@
-/* config.h.in.  Generated from configure.ac by autoheader.  */
-
-/* Define to 1 if you have the <dlfcn.h> header file. */
-#undef HAVE_DLFCN_H
-
-/* Define to 1 if you have the 'feenableexcept' function. */
-#undef HAVE_FEENABLEEXCEPT
-
-/* Define to 1 if you have the <inttypes.h> header file. */
-#undef HAVE_INTTYPES_H
-
-/* Define to 1 if you have the 'm' library (-lm). */
-#undef HAVE_LIBM
-
-/* Define to 1 if you have the 'z' library (-lz). */
-#undef HAVE_LIBZ
-
-/* Define to 1 if you have the 'pow' function. */
-#undef HAVE_POW
-
-/* Define to 1 if you have the <stdint.h> header file. */
-#undef HAVE_STDINT_H
-
-/* Define to 1 if you have the <stdio.h> header file. */
-#undef HAVE_STDIO_H
-
-/* Define to 1 if you have the <stdlib.h> header file. */
-#undef HAVE_STDLIB_H
-
-/* Define to 1 if you have the <strings.h> header file. */
-#undef HAVE_STRINGS_H
-
-/* Define to 1 if you have the <string.h> header file. */
-#undef HAVE_STRING_H
-
-/* Define to 1 if you have the <sys/stat.h> header file. */
-#undef HAVE_SYS_STAT_H
-
-/* Define to 1 if you have the <sys/types.h> header file. */
-#undef HAVE_SYS_TYPES_H
-
-/* Define to 1 if you have the <unistd.h> header file. */
-#undef HAVE_UNISTD_H
-
-/* Define to the sub-directory where libtool stores uninstalled libraries. */
-#undef LT_OBJDIR
-
-/* Name of package */
-#undef PACKAGE
-
-/* Define to the address where bug reports for this package should be sent. */
-#undef PACKAGE_BUGREPORT
-
-/* Define to the full name of this package. */
-#undef PACKAGE_NAME
-
-/* Define to the full name and version of this package. */
-#undef PACKAGE_STRING
-
-/* Define to the one symbol short name of this package. */
-#undef PACKAGE_TARNAME
-
-/* Define to the home page for this package. */
-#undef PACKAGE_URL
-
-/* Define to the version of this package. */
-#undef PACKAGE_VERSION
-
-/* Turn on ARM Neon optimizations at run-time */
-#undef PNG_ARM_NEON_API_SUPPORTED
-
-/* Check for ARM Neon support at run-time */
-#undef PNG_ARM_NEON_CHECK_SUPPORTED
-
-/* Enable ARM Neon optimizations */
-#undef PNG_ARM_NEON_OPT
-
-/* Enable Intel SSE optimizations */
-#undef PNG_INTEL_SSE_OPT
-
-/* Enable LOONGARCH LSX optimizations */
-#undef PNG_LOONGARCH_LSX_OPT
-
-/* Turn on MIPS MMI optimizations at run-time */
-#undef PNG_MIPS_MMI_API_SUPPORTED
-
-/* Check for MIPS MMI support at run-time */
-#undef PNG_MIPS_MMI_CHECK_SUPPORTED
-
-/* Enable MIPS MMI optimizations */
-#undef PNG_MIPS_MMI_OPT
-
-/* Turn on MIPS MSA optimizations at run-time */
-#undef PNG_MIPS_MSA_API_SUPPORTED
-
-/* Check for MIPS MSA support at run-time */
-#undef PNG_MIPS_MSA_CHECK_SUPPORTED
-
-/* Enable MIPS MSA optimizations */
-#undef PNG_MIPS_MSA_OPT
-
-/* Turn on POWERPC VSX optimizations at run-time */
-#undef PNG_POWERPC_VSX_API_SUPPORTED
-
-/* Check for POWERPC VSX support at run-time */
-#undef PNG_POWERPC_VSX_CHECK_SUPPORTED
-
-/* Enable POWERPC VSX optimizations */
-#undef PNG_POWERPC_VSX_OPT
-
-/* Enable RISCV RVV optimizations */
-#undef PNG_RISCV_RVV_OPT
-
-/* Define to 1 if all of the C89 standard headers exist (not just the ones
-   required in a freestanding environment). This macro is provided for
-   backward compatibility; new code need not use it. */
-#undef STDC_HEADERS
-
-/* Define to 1 if your <sys/time.h> declares 'struct tm'. */
-#undef TM_IN_SYS_TIME
-
-/* Version number of package */
-#undef VERSION
-
-/* Define to the equivalent of the C99 'restrict' keyword, or to
-   nothing if this is not supported.  Do not define if restrict is
-   supported only directly.  */
-#undef restrict
-/* Work around a bug in older versions of Sun C++, which did not
-   #define __restrict__ or support _Restrict or __restrict__
-   even though the corresponding Sun C compiler ended up with
-   "#define restrict _Restrict" or "#define restrict __restrict__"
-   in the previous line.  This workaround can be removed once
-   we assume Oracle Developer Studio 12.5 (2016) or later.  */
-#if defined __SUNPRO_CC && !defined __RESTRICT && !defined __restrict__
-# define _Restrict
-# define __restrict__
-#endif

configure.ac

@@ -1,12 +1,13 @@
 # configure.ac
 
-# Copyright (c) 2018-2024 Cosmin Truta
 # Copyright (c) 2004-2016 Glenn Randers-Pehrson
+# Last changed in libpng 1.7.0 [(PENDING RELEASE)]
 
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
 # and license in png.h
 
+
 dnl Process this file with autoconf to produce a configure script.
 dnl
 dnl Minor upgrades (compatible ABI): increment the package version
@@ -25,8 +26,8 @@ AC_PREREQ([2.68])
 
 dnl Version number stuff here:
 
-AC_INIT([libpng],[1.6.51.git],[png-mng-implement@lists.sourceforge.net])
-AC_CONFIG_MACRO_DIR([scripts/autoconf])
+AC_INIT([libpng],[1.7.0beta88],[png-mng-implement@lists.sourceforge.net])
+AC_CONFIG_MACRO_DIR([scripts])
 
 # libpng does not follow GNU file name conventions (hence 'foreign')
 # color-tests requires automake 1.11 or later
@@ -34,7 +35,8 @@ AC_CONFIG_MACRO_DIR([scripts/autoconf])
 # dist-xz requires automake 1.11 or later
 # 1.12.2 fixes a security issue in 1.11.2 and 1.12.1
 # 1.13 is required for parallel tests
-AM_INIT_AUTOMAKE([1.13 foreign dist-xz color-tests silent-rules subdir-objects])
+# 1.14.1 is required for %reldir% support
+AM_INIT_AUTOMAKE([1.15 foreign dist-xz color-tests silent-rules subdir-objects])
 # The following line causes --disable-maintainer-mode to be the default to
 # configure. This is necessary because libpng distributions cannot rely on the
 # time stamps of the autotools generated files being correct
@@ -46,17 +48,17 @@ 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=1.6.51.git
+PNGLIB_VERSION=1.7.0beta88
 PNGLIB_MAJOR=1
-PNGLIB_MINOR=6
-PNGLIB_RELEASE=51
+PNGLIB_MINOR=7
+PNGLIB_RELEASE=0
 
 dnl End of version number stuff
 
 AC_CONFIG_SRCDIR([pngget.c])
 AC_CONFIG_HEADERS([config.h])
 
-# Check the basic programs.
+# Checks for programs.
 AC_LANG([C])
 AC_PROG_CC
 AM_PROG_AS
@@ -67,54 +69,33 @@ AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 
-dnl libtool/libtoolize; version 2.4.2 is the tested version. This or any
+dnl libtool/libtoolize; version 2.4.4 is the tested version, this or any
 dnl compatible later version may be used
 LT_INIT([win32-dll])
-LT_PREREQ([2.4.2])
+LT_PREREQ([2.4.4])
 
-dnl Declare the AWK variable.
-AC_ARG_VAR(AWK, [AWK language processor])
-
-# Some awk implementations crash when confronted with pnglibconf.dfa.
-# Run a test now, to make sure this doesn't happen.
-AC_MSG_CHECKING([if awk ($AWK) works])
+# Some awks crash when confronted with pnglibconf.dfa, do a test run now
+# to make sure this doesn't happen
+AC_MSG_CHECKING([that AWK works])
 if ${AWK} -f ${srcdir}/scripts/options.awk out="/dev/null" version=search\
    ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\
    ${srcdir}/pngusr.dfa 1>&2
 then
-   AC_MSG_RESULT([yes])
+   AC_MSG_RESULT([ok])
 else
-   AC_MSG_FAILURE([no], 1)
+   AC_MSG_FAILURE([failed], 1)
 fi
 
 # This is a remnant of the old cc -E validation, where it may have been
 # necessary to use a different preprocessor for .dfn files
-DFNCPP="$CPP"
+DFNCPP="$CPP -E"
 AC_SUBST(DFNCPP)
 
-AC_ARG_ENABLE([tests],
-   AS_HELP_STRING([--disable-tests],
-      [do not build the test programs (default is to build)]),
-      [enable_tests="$enableval"],
-      [enable_tests=yes])
-
-AM_CONDITIONAL([ENABLE_TESTS],
-   [test "$enable_tests" != "no"])
-
-AC_ARG_ENABLE([tools],
-   AS_HELP_STRING([--disable-tools],
-      [do not build the auxiliary tools (default is to build)]),
-      [enable_tools="$enableval"],
-      [enable_tools=yes])
-
-AM_CONDITIONAL([ENABLE_TOOLS],
-   [test "$enable_tools" != "no"])
-
-# -Werror cannot be passed to GCC in CFLAGS because configure will fail
-# (it checks the compiler with a program that generates a warning).
-# Add the following option to deal with this:
+# -Werror cannot be passed to GCC in CFLAGS because configure will fail (it
+# checks the compiler with a program that generates a warning), add the
+# following option to deal with this
 AC_ARG_VAR(PNG_COPTS,
-   [additional flags for the C compiler, to be used for options that would]
+   [additional flags for the C compiler, use this for options that would]
    [cause configure itself to fail])
 AC_ARG_ENABLE(werror,
    AS_HELP_STRING([[[--enable-werror[=OPT]]]],
@@ -135,52 +116,153 @@ AC_ARG_ENABLE(werror,
       CFLAGS="$sav_CFLAGS"
     fi],)
 
-# For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89.
-# In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining
-# _POSIX_SOURCE to 1. This is incompatible with the new default mode, so
-# we test for that and force the "-std=c89" compiler option:
-AC_MSG_CHECKING([if we need to force back C standard to C89])
-AC_COMPILE_IFELSE(
-   [AC_LANG_PROGRAM([
-      [#define _POSIX_SOURCE 1]
-      [#include <stdio.h>]
-   ])],
-   AC_MSG_RESULT(no),[
-      if test "x$GCC" != "xyes"; then
-         AC_MSG_ERROR(
-            [Forcing back to C89 is required but the flags are only known for GCC])
-      fi
-   AC_MSG_RESULT(yes)
-   CFLAGS="$CFLAGS -std=c89"
-])
+# Checks for header files.
+AC_HEADER_STDC
+# Headers used in pngpriv.h:
+AC_CHECK_HEADERS([assert.h stdlib.h string.h float.h fp.h math.h m68881.h])
+# Additional headers used in pngconf.h:
+AC_CHECK_HEADERS([limits.h stddef.h stdio.h setjmp.h time.h])
+# Used by pngread.c (for the simplified API):
+AC_CHECK_HEADERS([errno.h])
+# The following are not required for the standard 'make' build of libpng:
+# Additional requirements of contrib/libtests/makepng.c:
+AC_CHECK_HEADERS([ctype.h])
+# Additional requirements of contrib/libtests/pngvalid.c:
+AC_CHECK_HEADERS([fenv.h])
 
-# Checks for structures and compiler characteristics.
-AC_STRUCT_TM
+# Checks for typedefs, structures, and compiler characteristics.
+# Most of these have been removed from 1.7.0 because they checked for non-ANSI-C
+# behaviors and the result were, anyway, not used by earlier versions of libpng.
 AC_C_RESTRICT
 
-# Checks for library functions.
-AC_CHECK_FUNCS([pow], ,
-  [AC_CHECK_LIB([m], [pow], , [AC_MSG_ERROR([cannot find pow])])])
+# Checks for library functions; these need to be in order, least demanding to
+# most because the -l directives are added to the head of the list at each
+# check.
+# ANSI-C functions: all are required but they don't have to be implemented in
+# libc, it is perfectly ok to configure with an extra, wrapper, library preset
+# in LIBS.  NOTE: this list may not be complete
+AC_CHECK_FUNCS([memset memcpy strncpy],,
+               AC_MSG_FAILURE([missing ANSI-C functions]))
 
-# Some later POSIX 1003.1 functions are required for test programs, failure
-# here is soft (the corresponding test program is not built).
+# Some later POSIX 1003.1 functions are required for test programs, failure here
+# is soft (the corresponding test program is not built).
 AC_CHECK_FUNC([clock_gettime],,[AC_MSG_WARN([not building timepng])])
 AM_CONDITIONAL([HAVE_CLOCK_GETTIME], [test "$ac_cv_func_clock_gettime" = "yes"])
 
-AC_ARG_WITH(zlib-prefix,
-   AS_HELP_STRING([[[--with-zlib-prefix]]],
-      [prefix that may have been used in installed zlib]),
-      [ZPREFIX=${withval}],
-      [ZPREFIX='z_'])
-AC_CHECK_LIB([z], [zlibVersion], ,
-  [AC_CHECK_LIB([z], [${ZPREFIX}zlibVersion], ,
-     [AC_MSG_ERROR([zlib not installed])])])
+# floor and ceil are required for FLOATING_POINT, but they can be turned off on
+# the configure command line (and they are independent.)  Default is to 'on'
+AC_ARG_ENABLE([floating-point],
+   AS_HELP_STRING([[[--enabled-floating-point]]],
+      [Enable floating point APIs (default: yes)]),,
+   [enable_floating_point=yes])
+
+AC_ARG_ENABLE([fixed-point],
+   AS_HELP_STRING([[[--enable-fixed-point]]],
+      [Enable fixed point APIs (default: yes)]),,
+   [enable_fixed_point=yes])
+
+AC_ARG_ENABLE([floating-arithmetic],
+   AS_HELP_STRING([[[--enable-floating-arithmetic]]],
+      [Use floating point arithmetic internally (default: yes)]),,
+   [enable_floating_arithmetic=yes])
+
+# Check for a requirement for math library support
+if test "$enable_floating_arithmetic" = yes
+then
+   AC_SEARCH_LIBS([floor],[m],,
+                  [AC_MSG_WARN([not found])
+                   enable_floating_arithmetic=no])
+   AC_SEARCH_LIBS([frexp],[m],,
+                  [AC_MSG_WARN([not found])
+                   enable_floating_arithmetic=no])
+   AC_SEARCH_LIBS([modf],[m],,
+                  [AC_MSG_WARN([not found])
+                   enable_floating_arithmetic=no])
+   AC_SEARCH_LIBS([atof],[m],,
+                  [AC_MSG_WARN([not found])
+                   enable_floating_arithmetic=no])
+   AC_SEARCH_LIBS([pow],[m],,
+                  [AC_MSG_WARN([not found])
+                   enable_floating_arithmetic=no])
+fi
+
+# Set the relevant defines if required (only if required). This will override
+# anything on the command line.
+if test "$enable_floating_point" != yes
+then
+   AC_MSG_NOTICE([Floating point APIs disabled])
+   AC_DEFINE([PNG_NO_FLOATING_POINT],[1],
+             [No support for floating point APIs])
+fi
+if test "$enable_fixed_point" != yes
+then
+   AC_MSG_NOTICE([Fixed point APIs disabled])
+   AC_DEFINE([PNG_NO_FIXED_POINT],[1],
+             [No support for fixed point APIs])
+fi
+if test "$enable_floating_arithmetic" != yes
+then
+   AC_MSG_NOTICE([Fixed point arithmetic will be used])
+   AC_DEFINE([PNG_NO_FLOATING_ARITHMETIC],[1],
+             [No support for floating point arithmetic])
+fi
 
 # The following is for pngvalid, to ensure it catches FP errors even on
 # platforms that don't enable FP exceptions, the function appears in the math
 # library (typically), it's not an error if it is not found.
-AC_CHECK_LIB([m], [feenableexcept])
-AC_CHECK_FUNCS([feenableexcept])
+AC_SEARCH_LIBS([feenableexcept],[m],AC_DEFINE([HAVE_FEENABLEEXCEPT],[1],
+      [Define to 1 if the feenableexcept function is available]))
+# Required by pngvalid:
+AC_SEARCH_LIBS([ceil],[m])
+
+# zlib checks and arguments;
+#  package zlib: argument is the name of the library
+#  zlib-header: the name of the header file
+#  zlib-prefix: the prefix for library functions, if any
+AC_ARG_WITH([zlib],
+   AS_HELP_STRING([[[--with-zlib=<name>]]],
+                  [base name of the zlib implementation (e.g. 'z')]),,
+   [with_zlib='z'])
+
+z_prefix=
+AC_ARG_WITH([zlib-prefix],
+   AS_HELP_STRING([[[--with-zlib-prefix=<prefix>]]],
+                  [prefix for zlib API functions]),
+   [if test "$withval" = "" -o "$withval" = yes; then
+      with_zlib_prefix='z_'
+      AC_DEFINE([PNG_ZLIB_PREFIX],[z_],[Standard zlib prefix])
+   elif test "${withval}" != "no"; then
+      AC_DEFINE_UNQUOTED([PNG_ZLIB_PREFIX],[${withval}],
+         [User defined zlib prefix])
+   else
+      with_zlib_prefix=
+   fi
+   if test "$with_zlib_prefix" != ""; then
+      AC_DEFINE([Z_PREFIX],[1],[Tell zlib.h to prefix function names])
+      z_prefix="#define Z_PREFIX 1"
+   fi])
+
+AC_ARG_WITH([zlib-header],
+   AS_HELP_STRING([[[--with-zlib-header='<file>' or '"file"']]],
+      [C include argument to locate zlib header file, e.g. <zlib.h>, take
+       care to put single quotes round this on the command line]),
+   [AC_DEFINE_UNQUOTED([PNG_ZLIB_HEADER],[${withval}],[Zlib header file])],
+   with_zlib_header='<zlib.h>')
+
+# AC_CHECK_LIB isn't quite enough for this because we need the special header
+# file too.
+LIBS="-l${with_zlib} $LIBS"
+AC_MSG_CHECKING(
+   [[Library '${with_zlib}' and #include ${with_zlib_header} for symbol '${with_zlib_prefix}zlibVersion']])
+AC_LINK_IFELSE(
+   [AC_LANG_PROGRAM(
+      [[
+${z_prefix}
+#include ${with_zlib_header}
+      ]],
+      [[(void)${with_zlib_prefix}zlibVersion();]])],
+   AC_MSG_RESULT([ok]),
+   AC_MSG_FAILURE([not found]))
 
 AC_MSG_CHECKING([if using Solaris linker])
 SLD=`$LD --version 2>&1 | grep Solaris`
@@ -226,9 +308,9 @@ AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
 if test "$have_ld_version_script" = "yes"; then
     AC_MSG_CHECKING([for symbol prefix])
     SYMBOL_PREFIX=`echo "PREFIX=__USER_LABEL_PREFIX__" \
-                  | ${CPP:-${CC:-gcc} -E} - 2>&1 \
-                  | ${EGREP:-grep} "^PREFIX=" \
-                  | ${SED:-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
+                  | ${DFNCPP-${CC-gcc -E}} - 2>&1 \
+                  | ${EGREP-grep} "^PREFIX=" \
+                  | ${SED-sed} -e "s:^PREFIX=::" -e "s:__USER_LABEL_PREFIX__::"`
     AC_SUBST(SYMBOL_PREFIX)
     AC_MSG_RESULT($SYMBOL_PREFIX)
 fi
@@ -313,437 +395,16 @@ AC_ARG_ENABLE([unversioned-libpng-config],
 AM_CONDITIONAL([DO_INSTALL_LIBPNG_CONFIG],
    [test "$enable_unversioned_libpng_config" != "no"])
 
-# HOST-SPECIFIC OPTIONS
-# =====================
-#
-# DEFAULT
-# =======
-#
-AC_ARG_ENABLE([hardware-optimizations],
-   AS_HELP_STRING([[[--enable-hardware-optimizations]]],
-      [Enable hardware optimizations: =no/off, yes/on.]),
-   [case "$enableval" in
-      no|off)
-         # disable hardware optimization on all systems:
-         enable_arm_neon=no
-         AC_DEFINE([PNG_ARM_NEON_OPT], [0],
-           [Disable ARM_NEON optimizations])
-         enable_mips_msa=no
-         AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
-           [Disable MIPS_MSA optimizations])
-         enable_mips_mmi=no
-         AC_DEFINE([PNG_MIPS_MMI_OPT], [0],
-           [Disable MIPS_MMI optimizations])
-         enable_powerpc_vsx=no
-         AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
-           [Disable POWERPC VSX optimizations])
-         enable_intel_sse=no
-         AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
-           [Disable INTEL_SSE optimizations])
-         enable_loongarch_lsx=no
-         AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [0],
-           [Disable LOONGARCH_LSX optimizations])
-         enable_riscv_rvv=no
-         AC_DEFINE([PNG_RISCV_RVV_OPT], [0],
-           [Disable RISC-V Vector optimizations])
-         ;;
-      *)
-         # allow enabling hardware optimization on any system:
-         case "$host_cpu" in
-            arm*|aarch64*)
-              enable_arm_neon=yes
-              AC_DEFINE([PNG_ARM_NEON_OPT], [2],
-                [Enable ARM_NEON optimizations])
-              ;;
-            mipsel*|mips64el*)
-              enable_mips_mmi=yes
-              enable_mips_msa=yes
-              AC_DEFINE([PNG_MIPS_MMI_OPT], [1],
-                [Enable MIPS_MMI optimizations])
-              AC_DEFINE([PNG_MIPS_MSA_OPT], [2],
-                [Enable MIPS_MSA optimizations])
-              ;;
-            i?86|x86_64)
-              enable_intel_sse=yes
-              AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
-                [Enable Intel SSE optimizations])
-              ;;
-            powerpc*|ppc64*)
-              enable_powerpc_vsx=yes
-              AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
-                [Enable POWERPC VSX optimizations])
-              ;;
-            loongarch*)
-              enable_loongarch_lsx=yes
-              AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
-                [Enable LOONGARCH_LSX optimizations])
-              ;;
-            riscv64)
-              enable_riscv_rvv=yes
-              AC_DEFINE([PNG_RISCV_RVV_OPT], [2],
-                [Enable RISC-V Vector optimizations])
-              ;;
-         esac
-         ;;
-   esac])
-
-# ARM NEON
-# ========
-
-AC_ARG_ENABLE([arm-neon],
-   AS_HELP_STRING([[[--enable-arm-neon]]],
-      [Enable ARM NEON optimizations: =no/off, check, api, yes/on.]
-      [no/off: disable the optimizations;]
-      [check: use internal checking code (deprecated and poorly supported);]
-      [api: disable by default, enable by a call to png_set_option;]
-      [yes/on: turn on unconditionally.]
-      [If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __ARM_NEON__ systems:
-         AC_DEFINE([PNG_ARM_NEON_OPT], [0],
-                   [Disable ARM Neon optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_arm_neon=no ;;
-      check)
-         AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
-                   [Check for ARM Neon support at run-time]);;
-      api)
-         AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
-                   [Turn on ARM Neon optimizations at run-time]);;
-      yes|on)
-         AC_DEFINE([PNG_ARM_NEON_OPT], [2],
-                   [Enable ARM Neon optimizations])
-         AC_MSG_WARN([--enable-arm-neon: please specify 'check' or 'api';]
-            [if you want the optimizations unconditionally,]
-            [pass '-mfpu=neon' to the compiler.]);;
-      *)
-         AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}:]
-                      [invalid argument])
-   esac])
-
-# Add ARM-specific files to all builds where $host_cpu is arm ('arm*') or
-# where ARM optimizations were explicitly requested. (This allows a fallback
-# if a future host CPU does not match 'arm*'.)
-
-AM_CONDITIONAL([PNG_ARM_NEON],
-   [test "$enable_arm_neon" != 'no' &&
-    case "$host_cpu" in
-      arm*|aarch64*) : ;;
-      *)    test "$enable_arm_neon" != '' ;;
-    esac])
-
-# MIPS MSA
-# ========
-
-AC_ARG_ENABLE([mips-msa],
-   AS_HELP_STRING([[[--enable-mips-msa]]],
-      [Enable MIPS MSA optimizations: =no/off, check, api, yes/on.]
-      [no/off: disable the optimizations;]
-      [check: use internal checking code (deprecated and poorly supported);]
-      [api: disable by default, enable by a call to png_set_option;]
-      [yes/on: turn on unconditionally.]
-      [If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __mips_msa systems:
-         AC_DEFINE([PNG_MIPS_MSA_OPT], [0],
-                   [Disable MIPS MSA optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_mips_msa=no ;;
-      check)
-         AC_DEFINE([PNG_MIPS_MSA_CHECK_SUPPORTED], [],
-                   [Check for MIPS MSA support at run-time]);;
-      api)
-         AC_DEFINE([PNG_MIPS_MSA_API_SUPPORTED], [],
-                   [Turn on MIPS MSA optimizations at run-time]);;
-      yes|on)
-         AC_DEFINE([PNG_MIPS_MSA_OPT], [2],
-                   [Enable MIPS MSA optimizations])
-         AC_MSG_WARN([--enable-mips-msa: please specify 'check' or 'api';]
-            [if you want the optimizations unconditionally,]
-            [pass '-mmsa -mfp64' to the compiler.]);;
-      *)
-         AC_MSG_ERROR([--enable-mips-msa=${enable_mips_msa}:]
-                      [invalid argument])
-   esac])
-
-# Add MIPS-specific files to all builds where $host_cpu is mips ('mips*') or
-# where MIPS optimizations were explicitly requested. (This allows a fallback
-# if a future host CPU does not match 'mips*'.)
-
-AM_CONDITIONAL([PNG_MIPS_MSA],
-   [test "$enable_mips_msa" != 'no' &&
-    case "$host_cpu" in
-      mipsel*|mips64el*) : ;;
-    esac])
-
-# MIPS MMI
-# ========
-
-AC_ARG_ENABLE([mips-mmi],
-   AS_HELP_STRING([[[--enable-mips-mmi]]],
-      [Enable MIPS MMI optimizations: =no/off, check, api, yes/on.]
-      [no/off: disable the optimizations;]
-      [check: use internal checking code (deprecated and poorly supported);]
-      [api: disable by default, enable by a call to png_set_option;]
-      [yes/on: turn on unconditionally.]
-      [If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __mips_mmi systems:
-         AC_DEFINE([PNG_MIPS_MMI_OPT], [0],
-                   [Disable MIPS MMI optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_mips_mmi=no;;
-      check)
-         AC_DEFINE([PNG_MIPS_MMI_CHECK_SUPPORTED], [],
-                   [Check for MIPS MMI support at run-time]);;
-      api)
-         AC_DEFINE([PNG_MIPS_MMI_API_SUPPORTED], [],
-                   [Turn on MIPS MMI optimizations at run-time]);;
-      yes|on)
-         AC_DEFINE([PNG_MIPS_MMI_OPT], [1],
-                   [Enable MIPS MMI optimizations])
-         AC_MSG_WARN([--enable-mips-mmi: please specify 'check' or 'api';]
-            [if you want the optimizations unconditionally]
-            [pass '-mloongson-mmi -march=loongson3a' to the compiler.]);;
-      *)
-         AC_MSG_ERROR([--enable-mips-mmi=${enable_mips_mmi}:]
-                      [invalid argument])
-   esac])
-
-# Add MIPS specific files to all builds where the host_cpu is mips ('mips*') or
-# where MIPS optimizations were explicitly requested. (This allows a fallback
-# if a future host CPU does not match 'mips*'.)
-
-AM_CONDITIONAL([PNG_MIPS_MMI],
-   [test "$enable_mips_mmi" != 'no' &&
-    case "$host_cpu" in
-      mipsel*|mips64el*) : ;;
-    esac])
-
-# INTEL SSE
-# =========
-
-AC_ARG_ENABLE([intel-sse],
-   AS_HELP_STRING([[[--enable-intel-sse]]],
-      [Enable Intel SSE optimizations: =no/off, yes/on.]
-      [no/off: disable the optimizations;]
-      [yes/on: enable the optimizations.]
-      [If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling:
-         AC_DEFINE([PNG_INTEL_SSE_OPT], [0],
-                   [Disable Intel SSE optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_intel_sse=no ;;
-      yes|on)
-         AC_DEFINE([PNG_INTEL_SSE_OPT], [1],
-                   [Enable Intel SSE optimizations]);;
-      *)
-         AC_MSG_ERROR([--enable-intel-sse=${enable_intel_sse}:]
-                      [invalid argument])
-   esac])
-
-# Add Intel-specific files to all builds where $host_cpu is Intel ('x86*') or
-# where Intel optimizations were explicitly requested. (This allows a fallback
-# if a future host CPU does not match 'x86*'.)
-AM_CONDITIONAL([PNG_INTEL_SSE],
-   [test "$enable_intel_sse" != 'no' &&
-    case "$host_cpu" in
-      i?86|x86_64) : ;;
-      *)    test "$enable_intel_sse" != '' ;;
-    esac])
-
-# POWERPC VSX
-# ===========
-
-AC_ARG_ENABLE([powerpc-vsx],
-AS_HELP_STRING([[[--enable-powerpc-vsx]]],
-      [Enable POWERPC VSX optimizations: =no/off, check, 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.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __ppc64__ systems:
-         AC_DEFINE([PNG_POWERPC_VSX_OPT], [0],
-                   [Disable POWERPC VSX optimizations])
-         # Prevent inclusion of the platform-specific files below:
-         enable_powerpc_vsx=no ;;
-      check)
-         AC_DEFINE([PNG_POWERPC_VSX_CHECK_SUPPORTED], [],
-                   [Check for POWERPC VSX support at run-time])
-         AC_MSG_WARN([--enable-powerpc-vsx: please see contrib/powerpc/README]
-                     [for the list of supported systems.]);;
-      api)
-         AC_DEFINE([PNG_POWERPC_VSX_API_SUPPORTED], [],
-                   [Turn on POWERPC VSX optimizations at run-time]);;
-      yes|on)
-         AC_DEFINE([PNG_POWERPC_VSX_OPT], [2],
-                   [Enable POWERPC VSX optimizations])
-         AC_MSG_WARN([--enable-powerpc-vsx: please specify 'check' or 'api';]
-            [if you want the optimizations unconditionally,]
-            [pass '-maltivec -mvsx' or '-mcpu=power8' to the compiler.]);;
-      *)
-         AC_MSG_ERROR([--enable-powerpc-vsx=${enable_powerpc_vsx}:]
-                      [invalid argument])
-   esac])
-
-# Add PowerPC-specific files to all builds where $host_cpu is powerpc
-# ('powerpc*') or where PowerPC optimizations were explicitly requested.
-# (This allows a fallback if a future host CPU does not match 'powerpc*'.)
-
-AM_CONDITIONAL([PNG_POWERPC_VSX],
-   [test "$enable_powerpc_vsx" != 'no' &&
-    case "$host_cpu" in
-      powerpc*|ppc64*) : ;;
-    esac])
-
-# LOONGARCH LSX
-# =============
-
-AC_ARG_ENABLE([loongarch-lsx],
-   AS_HELP_STRING([[[--enable-loongarch-lsx]]],
-      [Enable LOONGARCH LSX optimizations: =no/off, yes/on:]
-      [no/off: disable the optimizations;]
-      [yes/on: turn on unconditionally.]
-      [If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __loongarch_simd systems:
-         AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [0],
-                   [Disable LOONGARCH LSX optimizations])
-         # Prevent inclusion of the assembler files below:
-         enable_loongarch_lsx=no;;
-      yes|on)
-         AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
-                   [Enable LOONGARCH LSX optimizations])
-         ;;
-      *)
-         AC_MSG_ERROR([--enable-loongarch-lsx=${enable_loongarch_lsx}:]
-                      [invalid argument])
-   esac])
-
-if test "$enable_loongarch_lsx" != "no" &&
-   case "$host_cpu" in
-      loongarch*) : ;;
-      *)    test "$enable_loongarch_lsx" != '' ;;
-   esac
-then
-   compiler_support_loongarch_lsx=no
-   AC_MSG_CHECKING(whether to use LoongArch LSX intrinsics)
-   save_CFLAGS="$CFLAGS"
-   LSX_CFLAGS="${LSX_CFLAGS:-"-mlsx"}"
-   CFLAGS="$CFLAGS $LSX_CFLAGS"
-   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <lsxintrin.h>
-int main(){
-   __m128i a, b, c;
-   a = __lsx_vadd_w(b, c);
-   return 0;
-}]])],compiler_support_loongarch_lsx=yes)
-   CFLAGS="$save_CFLAGS"
-   AC_MSG_RESULT($compiler_support_loongarch_lsx)
-   if test "$compiler_support_loongarch_lsx" = "yes"; then
-      AC_DEFINE([PNG_LOONGARCH_LSX_OPT], [1],
-                [Enable LOONGARCH LSX optimizations])
-   else
-      AC_MSG_WARN([Compiler does not support loongarch LSX.])
-   fi
-fi
-
-# Add LoongArch specific files to all builds where the host_cpu is loongarch
-# ('loongarch*') or where LoongArch optimizations were explicitly requested.
-# (This allows a fallback if a future host CPU does not match 'loongarch*'.)
-
-AM_CONDITIONAL([PNG_LOONGARCH_LSX],
-   [test "$enable_loongarch_lsx" != "no" &&
-    test "$compiler_support_loongarch_lsx" = "yes" &&
-    case "$host_cpu" in
-      loongarch*) : ;;
-      *)    test "$enable_loongarch_lsx" != '' ;;
-    esac])
-
-# RISC-V
-# ======
-#
-# RISC-V Vector support.
-
-AC_ARG_ENABLE([riscv-rvv],
-AS_HELP_STRING([[[--enable-riscv-rvv]]],
-      [Enable RISC-V Vector optimizations: =no/off, check, 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. If not specified: determined by the compiler.]),
-   [case "$enableval" in
-      no|off)
-         # disable the default enabling on __riscv systems:
-         AC_DEFINE([PNG_RISCV_RVV_OPT], [0],
-                   [Disable RISC-V Vector optimizations])
-         # Prevent inclusion of the platform-specific files below:
-         enable_riscv_rvv=no ;;
-      yes|on)
-         AC_DEFINE([PNG_RISCV_RVV_OPT], [2],
-                   [Enable RISC-V Vector optimizations])
-         AC_MSG_WARN([--enable-riscv-rvv:]
-            [if you want the optimizations pass e.g. '-march=rv64gv1p0' to the compiler.]);;
-      *)
-         AC_MSG_ERROR([--enable-riscv-rvv=${enable_riscv_rvv}: invalid value])
-   esac])
-
-if test "$enable_riscv_rvv" != "no" &&
-   case "$host_cpu" in
-      riscv64) : ;;
-      *)    test "$enable_riscv_rvv" != '' ;;
-   esac
-then
-   compiler_support_riscv_rvv=no
-   AC_MSG_CHECKING(whether to use RISC-V RVV intrinsics)
-
-   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
-#include <riscv_vector.h>
-#include <asm/hwcap.h>
-#ifndef COMPAT_HWCAP_ISA_V /* added in linux-6.5 */
-#error "COMPAT_HWCAP_ISA_V is not available"
-#endif
-int main() {
-   const float src[] = { 0.0f, 0.0f, 0.0f, 0.0f };
-   uint64_t ptr[2] = {0x0908060504020100, 0xFFFFFFFF0E0D0C0A};
-   vuint8m1_t a = __riscv_vreinterpret_v_u64m1_u8m1(__riscv_vle64_v_u64m1(ptr, 2));
-   vfloat32m1_t val = __riscv_vle32_v_f32m1((const float*)(src), 4);
-   return (int)__riscv_vfmv_f_s_f32m1_f32(val);
-}]])],compiler_support_riscv_rvv=yes)
-   AC_MSG_RESULT($compiler_support_riscv_rvv)
-   if test "$compiler_support_riscv_rvv" = "yes"; then
-      AC_DEFINE([PNG_RISCV_RVV_OPT], [1],
-                [Enable RISCV RVV optimizations])
-   else
-      AC_MSG_WARN([Compiler does not support riscv rvv.])
-   fi
-fi
-
-# Add RISC-V-specific files to all builds where $host_cpu is riscv ('riscv64')
-# or where RISC-V optimizations were explicitly requested (this allows a fallback
-# if a future host CPU does not match 'riscv64')
-
-AM_CONDITIONAL([PNG_RISCV_RVV],
-   [test "$enable_riscv_rvv" != "no" &&
-    test "$compiler_support_riscv_rvv" = "yes" &&
-    case "$host_cpu" in
-      riscv64) : ;;
-      *)    test "$compiler_support_riscv_rvv" != '' ;;
-    esac])
+# EXTENSIONS
+# Configure (and all other) support for extensions is included when autoconf is
+# run by virtue of the existence (or not) of the following file:
+sinclude([contrib/extensions.ac])
+AM_CONDITIONAL([LIBPNG_EXTENSIONS],[test -n "$libpng_automake_extensions"])
 
 AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])
 
 # Config files, substituting as above
-AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
-AC_CONFIG_FILES([libpng-config:libpng-config.in],
-   [chmod +x libpng-config])
+AC_CONFIG_FILES([Makefile libpng.pc])
+AC_CONFIG_FILES([libpng-config], [chmod +x libpng-config])
 
 AC_OUTPUT

contrib/.editorconfig

@@ -1,9 +0,0 @@
-# https://editorconfig.org
-
-root = false
-
-[*.[ch]]
-indent_size = unset
-indent_style = unset
-max_doc_length = unset
-max_line_length = unset

contrib/README.txt

@@ -1,5 +1,3 @@
-External contributions to libpng
---------------------------------
 
 This "contrib" directory contains contributions which are not necessarily under
 the libpng license, although all are open source.  They are not part of

contrib/arm-neon/android-ndk.c

@@ -2,6 +2,7 @@
  *
  * Copyright (c) 2014 Glenn Randers-Pehrson
  * Written by John Bowler, 2014.
+ * Last changed in libpng 1.6.10 [March 6, 2014]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -23,7 +24,6 @@
  * has been compiled only, not linked: no version of the library has been found,
  * only the header files exist in the NDK.
  */
-
 #include <cpu-features.h>
 
 static int

contrib/arm-neon/linux-auxv.c

@@ -2,6 +2,7 @@
  *
  * Copyright (c) 2014 Glenn Randers-Pehrson
  * Written by Mans Rullgard, 2011.
+ * Last changed in libpng 1.6.10 [March 6, 2014]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -21,7 +22,6 @@
  * This generic __linux__ implementation requires reading /proc/self/auxv and
  * looking at each element for one that records NEON capabilities.
  */
-
 #include <unistd.h> /* for POSIX 1003.1 */
 #include <errno.h>  /* for EINTR */
 

contrib/arm-neon/linux.c

@@ -1,7 +1,8 @@
 /* contrib/arm-neon/linux.c
  *
- * Copyright (c) 2014, 2017 Glenn Randers-Pehrson
- * Written by John Bowler, 2014, 2017.
+ * Copyright (c) 2014 Glenn Randers-Pehrson
+ * Written by John Bowler, 2014.
+ * Last changed in libpng 1.6.16 [December 22, 2014]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -18,7 +19,6 @@
  * This code is strict ANSI-C and is probably moderately portable; it does
  * however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
  */
-
 #include <stdio.h>
 
 static int

contrib/conftest/basic.dfa

@@ -1,133 +0,0 @@
-# basic.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2024
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Build libpng with basic read and write support.  This enables the lowest
-# level libpng read and write APIs - the "row-by-row" ones.
-#
-# Support is enabled only for those transformations that are observed to be
-# required by widely used apps or are in the v3 specification.
-#
-
-everything = off
-
-# The sequential read code is enabled here; the progressive code can be used
-# instead but there is no point enabling both.
-
-option READ on
-option SEQUENTIAL_READ on
-option EASY_ACCESS on
-option SET_USER_LIMITS on
-option INFO_IMAGE on
-option READ_16BIT on
-
-# Errors: these can be disabled but then there won't be any error messages
-# just failures and the error messages are really needed for apps:
-option WARNINGS on
-option ERROR_TEXT on
-option BENIGN_READ_ERRORS on
-
-# Required for many display programs such as web browsers:
-option PROGRESSIVE_READ on
-
-# Switch on the write code - this makes a minimalist encoder but with
-# interlace support turned on; otherwise png_read_png..png_write_png will
-# fail on an interlaced image.
-option WRITE on
-option WRITE_INTERLACING on
-option WRITE_16BIT on
-
-# Usages of the 'fixed' APIs are relatively rare but they do occur
-# one or the other for both the API and the internal math.
-
-#Fixed point:
-option FIXED_POINT on
-
-#Floating point:
-option FLOATING_POINT on
-option FLOATING_ARITHMETIC on
-
-# Basic error handling, IO and user memory support.  The latter allows the
-# application program to provide its own implementations of 'malloc' and 'free'.
-option SETJMP on
-option STDIO on
-option USER_MEM on
-
-# Gamma handling: this needs to be on for the gamma handling
-option READ_GAMMA on
-
-# The supported chunks
-chunk bKGD on
-chunk cHRM on
-chunk eXIf on
-chunk gAMA on
-chunk iCCP on
-chunk iTXt on
-chunk pHYs on
-chunk sBIT on
-chunk sRGB on
-chunk tEXt on
-chunk tIME on
-chunk tRNS on
-chunk zTXt on
-
-# These don't seem to be used anywhere:
-# chunk pCAL
-# chunk sCAL
-# chunk sPLT
-
-# The rest of this is app dependent: none of these options are required for
-# read/write of the full range of PNG files and the normal chunk handling on
-# read.
-option WRITE_CUSTOMIZE_ZTXT_COMPRESSION on
-option WRITE_CUSTOMIZE_COMPRESSION on
-
-option READ_EXPAND on
-option READ_FILLER on
-option READ_GRAY_TO_RGB on
-option READ_INVERT on
-option READ_PACK on
-option READ_RGB_TO_GRAY on
-option READ_SCALE_16_TO_8 on
-option READ_SHIFT on
-option READ_STRIP_16_TO_8 on
-option READ_STRIP_ALPHA on
-option READ_SWAP on
-
-option CONVERT_tIME on
-
-# optipng
-option IO_STATE on
-option STORE_UNKNOWN_CHUNKS on
-option HANDLE_AS_UNKNOWN on
-
-# pngcrush
-option READ_USER_TRANSFORM on
-option WRITE_FLUSH on
-
-# pnmtopng
-chunk hIST on
-
-# cairo
-option WRITE_PACKSWAP on
-option WRITE_USER_TRANSFORM on
-
-# graphicsmagick
-option READ_USER_CHUNKS on
-
-# Qt5.15 qtgui (gentoo package split) Qt6.6 qtbase
-option READ_BGR on
-option WRITE_BGR on
-option READ_SWAP_ALPHA on
-option WRITE_SWAP_ALPHA on
-chunk oFFs on
-
-# ghostscript-gpl
-option WRITE_INVERT_ALPHA on
-option WRITE_INVERT on

contrib/conftest/fixed.dfa

@@ -1,15 +0,0 @@
-# fixed.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Test the standard libpng configuration without floating point (the internal
-# fixed point implementations are used instead).
-#
-option FLOATING_ARITHMETIC off
-option FLOATING_POINT off

contrib/conftest/float-fixed.dfa

@@ -1,14 +0,0 @@
-# fixed-float.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Test the standard libpng configuration with the fixed point internal
-# implementation in place of the default floating point
-#
-option FLOATING_ARITHMETIC off

contrib/conftest/nocompile-limits.dfa

@@ -1,21 +0,0 @@
-# nolimits.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-#
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Build libpng without any limits and without run-time settable limits.  Turning
-# USER_LIMITS off reduces libpng code size by allowing compile-time elimination
-# of some checking code.
-#
-option USER_LIMITS off
-
-@# define PNG_USER_WIDTH_MAX PNG_UINT_31_MAX
-@# define PNG_USER_HEIGHT_MAX PNG_UINT_31_MAX
-@# define PNG_USER_CHUNK_CACHE_MAX 0
-@# define PNG_USER_CHUNK_MALLOC_MAX 0

contrib/conftest/nolimits.dfa

@@ -1,19 +0,0 @@
-# nolimits.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-#
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Build libpng without any limits.  With these settigs run-time limits are still
-# possible.
-#
-@# define PNG_USER_WIDTH_MAX PNG_UINT_31_MAX
-@# define PNG_USER_HEIGHT_MAX PNG_UINT_31_MAX
-@# define PNG_USER_CHUNK_CACHE_MAX 0
-@# define PNG_USER_CHUNK_MALLOC_MAX 0
-

contrib/conftest/pngcp.dfa

@@ -13,30 +13,15 @@
 #
 everything = off
 
-# This option is specific to this configuration; it adds a #define to the
-# generated pnglibconf.h which turns on the (not portable) timing option for
-# pngcp.  Note that any option is automatically preceded by PNG_; there is no
-# way round this and this is deliberate.
-option PNGCP_TIMING
-
-# Because of the everything off above the option must also be turned on.  This
-# may not be done in one step because it is safer and avoids mis-spelled options
-# in user .dfa files to error out if an unrecognized option is turned on.
-option PNGCP_TIMING on
-
 # Options to turn on png_read_png and png_write_png:
-option INFO_IMAGE on
-option SEQUENTIAL_READ on
+option WRITE_PNG on
+option READ_PNG on
 option EASY_ACCESS on
-option WRITE on
 option WRITE_16BIT on
-option WRITE_FILTER on
+option SELECT_FILTER on
 
 # pngcp needs this to preserve unknown chunks, switching all these on means that
-# pngcp can work without explicit known chunk reading support
-option UNKNOWN_CHUNKS on
-option SET_UNKNOWN_CHUNKS on
-option HANDLE_AS_UNKNOWN on
+# pngcp can work without explicit known chunk reading suppport
 option SAVE_UNKNOWN_CHUNKS on
 option WRITE_UNKNOWN_CHUNKS on
 
@@ -44,14 +29,10 @@ option WRITE_UNKNOWN_CHUNKS on
 option CHECK_FOR_INVALID_INDEX on
 option GET_PALETTE_MAX on
 
-# Pre-libpng 1.7 pngcp has to stash text chunks manually, post 1.7 without this
-# text chunks should be handled as unknown ok.
-option TEXT on
-
 # this is used to turn off limits:
 option USER_LIMITS on
 option SET_USER_LIMITS on
 
-# these are just required for specific customizations
+# these are are just required for specific customizations
 option WRITE_CUSTOMIZE_ZTXT_COMPRESSION on
 option WRITE_CUSTOMIZE_COMPRESSION on

contrib/conftest/read-full.dfa

@@ -1,13 +0,0 @@
-# read-full.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Build libpng with no write support and full read support.
-#
-option WRITE off

contrib/conftest/write-full.dfa

@@ -1,13 +0,0 @@
-# write-full.dfa
-#  Build time configuration of libpng
-#
-# Author: John Bowler
-# Copyright: (c) John Bowler, 2025
-# Usage rights:
-#  To the extent possible under law, the author has waived all copyright and
-#  related or neighboring rights to this work.  This work is published from:
-#  United States.
-#
-# Build libpng with no read support and full write support.
-#
-option READ off

contrib/examples/.clang-format

@@ -1,143 +0,0 @@
----
-Language: Cpp
-AccessModifierOffset: -3
-AlignAfterOpenBracket: Align
-AlignArrayOfStructures: None
-AlignConsecutiveAssignments:
-  Enabled: false
-AlignConsecutiveBitFields:
-  Enabled: false
-AlignConsecutiveDeclarations:
-  Enabled: false
-AlignConsecutiveMacros:
-  Enabled: false
-AlignConsecutiveShortCaseStatements:
-  Enabled: false
-AlignEscapedNewlines: DontAlign
-AlignOperands: false
-AlignTrailingComments:
-  Kind: Never
-  OverEmptyLines: 0
-AllowAllArgumentsOnNextLine: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowBreakBeforeNoexceptSpecifier: Never
-AllowShortBlocksOnASingleLine: Never
-AllowShortCaseExpressionOnASingleLine: true
-AllowShortCaseLabelsOnASingleLine: true
-AllowShortCompoundRequirementOnASingleLine: true
-AllowShortEnumsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: None
-AllowShortIfStatementsOnASingleLine: Never
-AllowShortLambdasOnASingleLine: All
-AllowShortLoopsOnASingleLine: false
-AllowShortNamespacesOnASingleLine: false
-AlwaysBreakBeforeMultilineStrings: false
-BinPackArguments: true
-BinPackParameters: BinPack
-BitFieldColonSpacing: Both
-BraceWrapping:
-  AfterCaseLabel: true
-  AfterClass: true
-  AfterControlStatement: Always
-  AfterEnum: true
-  AfterExternBlock: false
-  AfterFunction: true
-  AfterNamespace: false
-  AfterObjCDeclaration: true
-  AfterStruct: true
-  AfterUnion: true
-  BeforeCatch: true
-  BeforeElse: true
-  BeforeLambdaBody: false
-  BeforeWhile: false
-  IndentBraces: false
-  SplitEmptyFunction: true
-  SplitEmptyRecord: true
-  SplitEmptyNamespace: true
-BreakAdjacentStringLiterals: true
-BreakAfterAttributes: Leave
-BreakAfterJavaFieldAnnotations: false
-BreakAfterReturnType: TopLevel
-BreakArrays: true
-BreakBeforeBinaryOperators: None
-BreakBeforeConceptDeclarations: Always
-BreakBeforeBraces: Custom
-BreakBeforeTernaryOperators: false
-BreakStringLiterals: false
-BreakTemplateDeclarations: MultiLine
-ColumnLimit: 79
-ContinuationIndentWidth: 3
-DerivePointerAlignment: true
-EmptyLineAfterAccessModifier: Never
-EmptyLineBeforeAccessModifier: LogicalBlock
-FixNamespaceComments: true
-IncludeBlocks: Preserve
-IndentAccessModifiers: false
-IndentCaseBlocks: true
-IndentCaseLabels: true
-IndentExportBlock: true
-IndentExternBlock: AfterExternBlock
-IndentGotoLabels: false
-IndentPPDirectives: None
-IndentRequiresClause: true
-IndentWidth: 3
-IndentWrappedFunctionNames: false
-KeepEmptyLines:
-  AtEndOfFile: false
-  AtStartOfBlock: false
-  AtStartOfFile: false
-KeepFormFeed: false
-MaxEmptyLinesToKeep: 2
-NamespaceIndentation: None
-PackConstructorInitializers: Never
-PointerAlignment: Left
-QualifierAlignment: Custom
-QualifierOrder: [static, inline, constexpr, const, volatile, restrict, type]
-ReferenceAlignment: Pointer
-ReflowComments: Never
-RequiresClausePosition: OwnLine
-RequiresExpressionIndentation: OuterScope
-SortIncludes: false
-SortUsingDeclarations: LexicographicNumeric
-SpaceAfterCStyleCast: false
-SpaceAfterLogicalNot: false
-SpaceAfterTemplateKeyword: true
-SpaceAroundPointerQualifiers: Default
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeCaseColon: false
-SpaceBeforeCpp11BracedList: false
-SpaceBeforeCtorInitializerColon: true
-SpaceBeforeInheritanceColon: true
-SpaceBeforeJsonColon: false
-SpaceBeforeParens: ControlStatements
-SpaceBeforeParensOptions:
-  AfterControlStatements: true
-  AfterFunctionDefinitionName: false
-  AfterFunctionDeclarationName: false
-  AfterOverloadedOperator: false
-  AfterPlacementOperator: true
-  AfterRequiresInClause: false
-  AfterRequiresInExpression: false
-  BeforeNonEmptyParentheses: false
-SpaceBeforeRangeBasedForLoopColon: true
-SpaceBeforeSquareBrackets: false
-SpaceInEmptyBlock: false
-SpacesBeforeTrailingComments: 1
-SpacesInAngles: Never
-SpacesInContainerLiterals: true
-SpacesInLineCommentPrefix:
-  Minimum: 1
-  Maximum: -1
-SpacesInParens: Never
-SpacesInParensOptions:
-  ExceptDoubleParentheses: false
-  InCStyleCasts: false
-  InConditionalStatements: false
-  InEmptyParentheses: false
-  Other: false
-SpacesInSquareBrackets: false
-Standard: Latest
-TabWidth: 8
-UseTab: Never
-WrapNamespaceBodyWithEmptyLines: Leave
-...

contrib/examples/README.txt

@@ -1,3 +1,4 @@
+
 This directory (contrib/examples) contains examples of libpng usage.
 
 NO COPYRIGHT RIGHTS ARE CLAIMED TO ANY OF THE FILES IN THIS DIRECTORY.
@@ -20,4 +21,4 @@ ORIGINAL AUTHORS
     of the people below claim any rights with regard to the contents of this
     directory.
 
-    John Bowler <jbowler at acm.org>
+    John Bowler <jbowler@acm.org>

contrib/examples/iccfrompng.c

@@ -10,7 +10,7 @@
  * without processing the image.  Notice that some header information may occur
  * after the image data. Textual data and comments are an example; the approach
  * in this file won't work reliably for such data because it only looks for the
- * information in the section of the file that precedes the image data.
+ * information in the section of the file that preceeds the image data.
  *
  * Compile and link against libpng and zlib, plus anything else required on the
  * system you use.
@@ -26,9 +26,8 @@
 
 #include <png.h>
 
-#if !defined(PNG_iCCP_SUPPORTED) || !defined(PNG_READ_SUPPORTED)
-#error This program requires libpng supporting the iCCP chunk and the read API
-#endif
+#if defined(PNG_READ_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) && \
+    defined (PNG_iCCP_SUPPORTED)
 
 
 static int verbose = 1;
@@ -37,8 +36,7 @@ static png_byte no_profile[] = "no profile";
 static png_bytep
 extract(FILE *fp, png_uint_32 *proflen)
 {
-   png_structp png_ptr =
-      png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+   png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0);
    png_infop info_ptr = NULL;
    png_bytep result = NULL;
 
@@ -163,9 +161,6 @@ extract_one_file(const char *filename)
    else
       fprintf(stderr, "%s: could not open file\n", filename);
 
-   if (fp != NULL)
-      fclose(fp);
-
    return result;
 }
 
@@ -187,3 +182,4 @@ main(int argc, char **argv)
    /* Exit code is true if any extract succeeds */
    return extracted == 0;
 }
+#endif /* READ && STDIO && iCCP */

contrib/examples/pngpixel.c

@@ -15,8 +15,8 @@
  * images.  Normally you would call png_set_interlace_handling() to have libpng
  * deal with the interlace for you, but that obliges you to buffer half of the
  * image to assemble the interlaced rows.  In this code
- * png_set_interlace_handling() is not called and, instead, the code handles
- * the interlace passes directly looking for the required pixel.
+ * png_set_interlace_handling() is not called and, instead, the code handles the
+ * interlace passes directly looking for the required pixel.
  */
 #include <stdlib.h>
 #include <stdio.h>
@@ -27,31 +27,28 @@
  */
 #include "../../png.h"
 
-#if !defined(PNG_READ_SUPPORTED) || !defined(PNG_SEQUENTIAL_READ_SUPPORTED)
-#error This program requires libpng supporting the read and sequential read API
-#endif
-
+#if defined(PNG_READ_SUPPORTED) && defined(PNG_SEQUENTIAL_READ_SUPPORTED)
 
 /* Return component 'c' of pixel 'x' from the given row. */
 static unsigned int
 component(png_const_bytep row, png_uint_32 x, unsigned int c,
    unsigned int bit_depth, unsigned int channels)
 {
-   /* PNG images can be up to 2^31 pixels wide, which means they can be up to
-    * 2^37 bits wide (for a 64-bit pixel - the largest possible) and hence
-    * 2^34 bytes wide.  Since the row fitted into memory, the following must
+   /* PNG images can be up to 2^31 pixels wide, but this means they can be up to
+    * 2^37 bits wide (for a 64-bit pixel - the largest possible) and hence 2^34
+    * bytes wide.  Since the row fitted into memory, however, the following must
     * work:
     */
    png_uint_32 bit_offset_hi = bit_depth * ((x >> 6) * channels);
    png_uint_32 bit_offset_lo = bit_depth * ((x & 0x3f) * channels + c);
 
-   row = (png_const_bytep)(((const png_byte(*)[8])row) + bit_offset_hi);
+   row = (png_const_bytep)(((PNG_CONST png_byte (*)[8])row) + bit_offset_hi);
    row += bit_offset_lo >> 3;
    bit_offset_lo &= 0x07;
 
    /* PNG pixels are packed into bytes to put the first pixel in the highest
-    * bits of the byte, and into two bytes for 16-bit values with the high
-    * 8 bits first, so:
+    * bits of the byte and into two bytes for 16-bit values with the high 8 bits
+    * first, so:
     */
    switch (bit_depth)
    {
@@ -76,7 +73,7 @@ static void
 print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row,
    png_uint_32 x)
 {
-   unsigned int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
+   PNG_CONST unsigned int bit_depth = png_get_bit_depth(png_ptr, info_ptr);
 
    switch (png_get_color_type(png_ptr, info_ptr))
    {
@@ -90,29 +87,27 @@ print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row,
        */
       case PNG_COLOR_TYPE_PALETTE:
          {
-            int index = component(row, x, 0, bit_depth, 1);
+            PNG_CONST int index = component(row, x, 0, bit_depth, 1);
             png_colorp palette = NULL;
             int num_palette = 0;
 
             if ((png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette) &
-                 PNG_INFO_PLTE) &&
-                (num_palette > 0) &&
-                (palette != NULL))
+               PNG_INFO_PLTE) && num_palette > 0 && palette != NULL)
             {
                png_bytep trans_alpha = NULL;
                int num_trans = 0;
                if ((png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans,
-                                 NULL) & PNG_INFO_tRNS) &&
-                   (num_trans > 0) &&
-                   (trans_alpha != NULL))
+                  NULL) & PNG_INFO_tRNS) && num_trans > 0 &&
+                  trans_alpha != NULL)
                   printf("INDEXED %u = %d %d %d %d\n", index,
                      palette[index].red, palette[index].green,
                      palette[index].blue,
                      index < num_trans ? trans_alpha[index] : 255);
 
                else /* no transparency */
-                  printf("INDEXED %u = %d %d %d\n", index, palette[index].red,
-                         palette[index].green, palette[index].blue);
+                  printf("INDEXED %u = %d %d %d\n", index,
+                     palette[index].red, palette[index].green,
+                     palette[index].blue);
             }
 
             else
@@ -143,8 +138,7 @@ print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row,
    }
 }
 
-int
-main(int argc, const char **argv)
+int main(int argc, const char **argv)
 {
    /* This program uses the default, <setjmp.h> based, libpng error handling
     * mechanism, therefore any local variable that exists before the call to
@@ -169,8 +163,8 @@ main(int argc, const char **argv)
           * writes error messages to stderr.  Creating the png_struct is a
           * little tricky; just copy the following code.
           */
-         png_structp png_ptr =
-            png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+         png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
+            NULL, NULL, NULL);
 
          if (png_ptr != NULL)
          {
@@ -190,11 +184,11 @@ main(int argc, const char **argv)
                      compression_method, filter_method;
                   png_bytep row_tmp;
 
-                  /* Now associate the recently opened FILE object with the
-                   * default libpng initialization functions.  Sometimes libpng
-                   * is compiled without stdio support (it can be difficult to
-                   * do in some environments); in that case you will have to
-                   * write your own read callback to read data from the stream.
+                  /* Now associate the recently opened (FILE*) with the default
+                   * libpng initialization functions.  Sometimes libpng is
+                   * compiled without stdio support (it can be difficult to do
+                   * in some environments); in that case you will have to write
+                   * your own read callback to read data from the (FILE*).
                    */
                   png_init_io(png_ptr, f);
 
@@ -208,16 +202,16 @@ main(int argc, const char **argv)
                    * space.  In this case png_malloc is used - it will not
                    * return if memory isn't available.
                    */
-                  row =
-                     png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr));
+                  row = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
+                     info_ptr));
 
-                  /* Avoid the overhead of using a volatile auto copy row_tmp
+                  /* To avoid the overhead of using a volatile auto copy row_tmp
                    * to a local here - just use row for the png_free below.
                    */
                   row_tmp = row;
 
-                  /* All the information we need is in the header returned by
-                   * png_get_IHDR.  If this fails, we can use 'png_error' to
+                  /* All the information we need is in the header is returned by
+                   * png_get_IHDR, if this fails we can now use 'png_error' to
                    * signal the error and return control to the setjmp above.
                    */
                   if (png_get_IHDR(png_ptr, info_ptr, &width, &height,
@@ -305,27 +299,19 @@ main(int argc, const char **argv)
                             * are, of course, much better ways of doing this
                             * than using a for loop:
                             */
-                           if (y == py)
+                           if (y == py) for (px = xstart, ppx = 0;
+                              px < width; px += xstep, ++ppx) if (x == px)
                            {
-                              for (px = xstart, ppx = 0;
-                                   px < width;
-                                   px += xstep, ++ppx)
-                              {
-                                 if (x == px)
-                                 {
-                                    /* 'ppx' is the index of the pixel in the
-                                     * row buffer.
+                              /* 'ppx' is the index of the pixel in the row
+                               * buffer.
                                */
-                                    print_pixel(png_ptr, info_ptr, row_tmp,
-                                                ppx);
+                              print_pixel(png_ptr, info_ptr, row_tmp, ppx);
 
                               /* Now terminate the loops early - we have
                                * found and handled the required data.
                                */
                               goto pass_loop_end;
                            } /* x loop */
-                              }
-                           }
                         } /* y loop */
                      } /* pass loop */
 
@@ -337,6 +323,7 @@ main(int argc, const char **argv)
 
                   else
                      png_error(png_ptr, "pngpixel: png_get_IHDR failed");
+
                }
 
                else
@@ -362,8 +349,7 @@ main(int argc, const char **argv)
             }
 
             else
-               fprintf(stderr,
-                       "pngpixel: out of memory allocating png_info\n");
+               fprintf(stderr, "pngpixel: out of memory allocating png_info\n");
 
             png_destroy_read_struct(&png_ptr, NULL, NULL);
          }
@@ -382,3 +368,4 @@ main(int argc, const char **argv)
 
    return result;
 }
+#endif /* READ && SEQUENTIAL_READ */

contrib/examples/pngtopng.c

@@ -5,11 +5,13 @@
  * related or neighboring rights to this work.  This work is published from:
  * United States.
  *
+ * Last changed in libpng 1.6.29 [%RDATE%]
+ *
  * Read a PNG and write it out in a fixed format, using the 'simplified API'
  * that was introduced in libpng-1.6.0.
  *
- * This sample code is just the code from 'example.c' with some error handling
- * added.  See example.c in the top-level libpng directory for more comments.
+ * This sample code is just the code from the top of 'example.c' with some error
+ * handling added.  See example.c for more comments.
  */
 #include <stddef.h>
 #include <stdlib.h>
@@ -20,15 +22,10 @@
  * ensure the code picks up the local libpng implementation:
  */
 #include "../../png.h"
+#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) && \
+    defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
 
-#if !defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \
-    !defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
-#error This program requires libpng supporting the simplified read/write API
-#endif
-
-
-int
-main(int argc, const char **argv)
+int main(int argc, const char **argv)
 {
    int result = 1;
 
@@ -54,11 +51,11 @@ main(int argc, const char **argv)
          if (buffer != NULL)
          {
             if (png_image_finish_read(&image, NULL/*background*/, buffer,
-                                      0 /*row_stride*/, NULL /*colormap */))
+               0/*row_stride*/, NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP */))
             {
-               if (png_image_write_to_file(
-                      &image, argv[2], 0 /*convert_to_8bit*/, buffer,
-                      0 /*row_stride*/, NULL /*colormap*/))
+               if (png_image_write_to_file(&image, argv[2],
+                  0/*convert_to_8bit*/, buffer, 0/*row_stride*/,
+                  NULL/*colormap*/))
                   result = 0;
 
                else
@@ -98,3 +95,4 @@ main(int argc, const char **argv)
 
    return result;
 }
+#endif /* READ && WRITE */

contrib/examples/simpleover.c

@@ -6,9 +6,9 @@
  * United States.
  *
  * Read several PNG files, which should have an alpha channel or transparency
- * information, and composite them together to produce one or more 16-bit
- * linear RGBA intermediates.  This involves doing the 'over' compositing
- * operation to combine the alpha channels and corresponding data.
+ * information, and composite them together to produce one or more 16-bit linear
+ * RGBA intermediates.  This involves doing the correct 'over' composition to
+ * combine the alpha channels and corresponding data.
  *
  * Finally read an output (background) PNG using the 24-bit RGB format (the
  * PNG will be composited on green (#00ff00) by default if it has an alpha
@@ -28,8 +28,8 @@
  * correctly.  Apart from the libpng Simplified API the only work done in here
  * is to combine multiple input PNG images into a single sprite; this involves
  * a Porter-Duff 'over' operation and the input PNG images may, as a result,
- * be regarded as being layered one on top of the other with the first
- * (leftmost on the command line) being at the bottom and the last on the top.
+ * be regarded as being layered one on top of the other with the first (leftmost
+ * on the command line) being at the bottom and the last on the top.
  */
 #include <stddef.h>
 #include <stdlib.h>
@@ -44,13 +44,10 @@
  */
 #include "../../png.h"
 
-#if !defined(PNG_SIMPLIFIED_READ_SUPPORTED)
-#error This program requires libpng supporting the simplified read API
-#endif
+#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
 
 #define sprite_name_chars 15
-struct sprite
-{
+struct sprite {
    FILE         *file;
    png_uint_16p  buffer;
    unsigned int  width;
@@ -62,21 +59,18 @@ struct sprite
 #include <math.h>
 #include <stdio.h>
 
-int
-main(void)
-{
+int main(void) {
    double err = 0;
    unsigned int xerr = 0;
    unsigned int r = 32769;
+   {
       unsigned int x = 0;
 
-   do
-   {
+      do {
          unsigned int t = x + (x >> 16) /*+ (x >> 31)*/ + r;
          double v = x, errtest;
 
-      if (t < x)
-      {
+         if (t < x) {
             fprintf(stderr, "overflow: %u+%u -> %u\n", x, r, t);
             return 1;
          }
@@ -86,19 +80,18 @@ main(void)
          t >>= 16;
          errtest -= t;
 
-      if (errtest > err)
-      {
+         if (errtest > err) {
             err = errtest;
             xerr = x;
 
-         if (errtest >= .5)
-         {
+            if (errtest >= .5) {
                fprintf(stderr, "error: %u/65535 = %f, not %u, error %f\n",
                      x, v, t, errtest);
                return 0;
             }
          }
       } while (++x <= 65535U*65535U);
+   }
 
    printf("error %f @ %u\n", err, xerr);
 
@@ -119,8 +112,8 @@ sprite_op(const struct sprite *sprite, int x_offset, int y_offset,
    /* Check for an x or y offset that pushes any part of the image beyond the
     * right or bottom of the sprite:
     */
-   if ((y_offset < 0 || /*SAFE*/ (unsigned)y_offset < sprite->height) &&
-       (x_offset < 0 || /*SAFE*/ (unsigned)x_offset < sprite->width))
+   if ((y_offset < 0 || (unsigned)/*SAFE*/y_offset < sprite->height) &&
+       (x_offset < 0 || (unsigned)/*SAFE*/x_offset < sprite->width))
    {
       unsigned int y = 0;
 
@@ -179,15 +172,15 @@ sprite_op(const struct sprite *sprite, int x_offset, int y_offset,
                }
 
                else
-               {
-                  out_pixel[0] = in_pixel[0];
-                  out_pixel[1] = in_pixel[1];
-                  out_pixel[2] = in_pixel[2];
+                  out_pixel[0] = in_pixel[0],
+                  out_pixel[1] = in_pixel[1],
+                  out_pixel[2] = in_pixel[2],
                   out_pixel[3] = in_pixel[3];
             }
          }
-         } while (++x < image->width);
-      } while (++y < image->height);
+         while (++x < image->width);
+      }
+      while (++y < image->height);
    }
 }
 
@@ -232,7 +225,8 @@ create_sprite(struct sprite *sprite, int *argc, const char ***argv)
             if (buffer != NULL)
             {
                if (png_image_finish_read(&image, NULL/*background*/, buffer,
-                                         0 /*row_stride*/, NULL /*colormap*/))
+                  0/*row_stride*/,
+                  NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP*/))
                {
                   /* This is the place where the Porter-Duff 'Over' operator
                    * needs to be done by this code.  In fact, any image
@@ -297,8 +291,7 @@ create_sprite(struct sprite *sprite, int *argc, const char ***argv)
       save.colormap_entries = 0;
 
       if (png_image_write_to_stdio(&save, sprite->file, 1/*convert_to_8_bit*/,
-                                   sprite->buffer, 0 /*row_stride*/,
-                                   NULL /*colormap*/))
+          sprite->buffer, 0/*row_stride*/, NULL/*colormap*/))
       {
          /* Success; the buffer is no longer needed: */
          free(sprite->buffer);
@@ -312,8 +305,7 @@ create_sprite(struct sprite *sprite, int *argc, const char ***argv)
    }
 
    else
-      fprintf(stderr,
-              "simpleover: sprite %s: could not allocate tmpfile: %s\n",
+      fprintf(stderr, "simpleover: sprite %s: could not allocate tmpfile: %s\n",
          sprite->name, strerror(errno));
 
    return 0; /* fail */
@@ -342,8 +334,8 @@ add_sprite(png_imagep output, png_bytep out_buf, struct sprite *sprite,
           * will fit.
           */
          if (x < 0 || y < 0 ||
-             /*SAFE*/ (unsigned)x >= output->width ||
-             /*SAFE*/ (unsigned)y >= output->height ||
+             (unsigned)/*SAFE*/x >= output->width ||
+             (unsigned)/*SAFE*/y >= output->height ||
              sprite->width > output->width-x ||
              sprite->height > output->height-y)
          {
@@ -367,10 +359,10 @@ add_sprite(png_imagep output, png_bytep out_buf, struct sprite *sprite,
             {
                in.format = PNG_FORMAT_RGB; /* force compose */
 
-               if (png_image_finish_read(
-                      &in, NULL /*background*/,
+               if (png_image_finish_read(&in, NULL/*background*/,
                   out_buf + (y*output->width + x)*3/*RGB*/,
-                      output->width * 3 /*row_stride*/, NULL /*colormap*/))
+                  output->width*3/*row_stride*/,
+                  NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP*/))
                {
                   ++*argv, --*argc;
                   continue;
@@ -420,14 +412,12 @@ simpleover_process(png_imagep output, png_bytep out_buf, int argc,
             sprites[nsprites].width = sprites[nsprites].height = 0;
             sprites[nsprites].name[0] = 0;
 
-            n = sscanf(argv[0],
-                       "--sprite=%u,%u,%" str(sprite_name_chars) "s%c",
+            n = sscanf(argv[0], "--sprite=%u,%u,%" str(sprite_name_chars) "s%c",
                 &sprites[nsprites].width, &sprites[nsprites].height,
                 sprites[nsprites].name, &tombstone);
 
             if ((n == 2 || n == 3) &&
-                (sprites[nsprites].width > 0) &&
-                (sprites[nsprites].height > 0))
+                sprites[nsprites].width > 0 && sprites[nsprites].height > 0)
             {
                size_t buf_size, tmp;
 
@@ -476,8 +466,7 @@ simpleover_process(png_imagep output, png_bytep out_buf, int argc,
             else
             {
                fprintf(stderr, "simpleover: %s: invalid sprite (%u,%u)\n",
-                       argv[0],
-                       sprites[nsprites].width, sprites[nsprites].height);
+                  argv[0], sprites[nsprites].width, sprites[nsprites].height);
                break;
             }
          }
@@ -500,8 +489,7 @@ simpleover_process(png_imagep output, png_bytep out_buf, int argc,
          {
             if (strcmp(sprites[isprite].name, name) == 0)
             {
-               if (!add_sprite(output, out_buf, sprites + isprite,
-                               &argc, &argv))
+               if (!add_sprite(output, out_buf, sprites+isprite, &argc, &argv))
                   goto out; /* error in add_sprite */
 
                break;
@@ -510,8 +498,7 @@ simpleover_process(png_imagep output, png_bytep out_buf, int argc,
 
          if (isprite < 0) /* sprite not found */
          {
-            fprintf(stderr, "simpleover: --add='%s': sprite not found\n",
-                    name);
+            fprintf(stderr, "simpleover: --add='%s': sprite not found\n", name);
             break;
          }
       }
@@ -539,8 +526,7 @@ out:
    return result;
 }
 
-int
-main(int argc, const char **argv)
+int main(int argc, const char **argv)
 {
    int result = 1; /* default to fail */
 
@@ -572,7 +558,7 @@ main(int argc, const char **argv)
             png_color background = {0, 0xff, 0}; /* fully saturated green */
 
             if (png_image_finish_read(&image, &background, buffer,
-                                      0 /*row_stride*/, NULL /*colormap*/))
+               0/*row_stride*/, NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP */))
             {
                /* At this point png_image_finish_read has cleaned up the
                 * allocated data in png_image, and only the buffer needs to be
@@ -580,24 +566,22 @@ main(int argc, const char **argv)
                 *
                 * Perform the remaining operations:
                 */
-               if (simpleover_process(&image, buffer,
-                                      argc - argi, argv + argi))
+               if (simpleover_process(&image, buffer, argc-argi, argv+argi))
                {
                   /* Write the output: */
                   if ((output != NULL &&
-                       png_image_write_to_file(
-                          &image, output, 0 /*convert_to_8bit*/, buffer,
-                          0 /*row_stride*/, NULL /*colormap*/)) ||
+                       png_image_write_to_file(&image, output,
+                        0/*convert_to_8bit*/, buffer, 0/*row_stride*/,
+                        NULL/*colormap*/)) ||
                       (output == NULL &&
-                       png_image_write_to_stdio(
-                          &image, stdout, 0 /*convert_to_8bit*/, buffer,
-                          0 /*row_stride*/, NULL /*colormap*/)))
+                       png_image_write_to_stdio(&image, stdout,
+                        0/*convert_to_8bit*/, buffer, 0/*row_stride*/,
+                        NULL/*colormap*/)))
                      result = 0;
 
                   else
                      fprintf(stderr, "simpleover: write %s: %s\n",
-                             output == NULL ? "stdout" : output,
-                             image.message);
+                        output == NULL ? "stdout" : output, image.message);
                }
 
                /* else simpleover_process writes an error message */
@@ -633,8 +617,7 @@ main(int argc, const char **argv)
    else
    {
       /* Usage message */
-      fprintf(
-         stderr,
+      fprintf(stderr,
          "simpleover: usage: simpleover background.png [output.png]\n"
          "  Output 'background.png' as a 24-bit RGB PNG file in 'output.png'\n"
          "   or, if not given, stdout.  'background.png' will be composited\n"
@@ -645,13 +628,13 @@ main(int argc, const char **argv)
          "   --sprite=width,height,name {[--at=x,y] {sprite.png}}\n"
          "    Produce a transparent sprite of size (width,height) and with\n"
          "     name 'name'.\n"
-         "    For each sprite.png composite it is using a Porter-Duff 'Over'\n"
-         "     operation at offset (x,y) in the sprite, defaulting to (0,0).\n"
+         "    For each sprite.png composite it using a Porter-Duff 'Over'\n"
+         "     operation at offset (x,y) in the sprite (defaulting to (0,0)).\n"
          "     Input PNGs will be truncated to the area of the sprite.\n"
          "\n"
          "   --add='name' {x,y}\n"
          "    Optionally, before output, composite a sprite, 'name', which\n"
-         "     must have been previously produced using --sprite at each\n"
+         "     must have been previously produced using --sprite, at each\n"
          "     offset (x,y) in the output image.  Each sprite must fit\n"
          "     completely within the output image.\n"
          "\n"
@@ -662,3 +645,4 @@ main(int argc, const char **argv)
 
    return result;
 }
+#endif /* SIMPLIFIED_READ */

contrib/extensions.ac

@@ -0,0 +1,16 @@
+# CONTRIBUTED EXTENSIONS
+#
+# The following extensions are part of a standard libpng distribution.  They are
+# not supported parts of libpng and they are not necessarily released under the
+# same license as libpng.  Please consult the relevant directory for copyright
+# and support information before uncommenting any of the lines below.
+#
+# After you change this file you MUST re-run "autoreconf" to regenerate the
+# configure script, otherwise the change may have no effect.
+#
+# Include the ARM NEON extension:
+#sinclude([contrib/neon/neon.ac])
+#
+# If any of the extensions require automake support (this is likely) automake
+# must include the file contrib/extensions.am
+#libpng_automake_extensions="yes"

contrib/extensions.am

@@ -0,0 +1,7 @@
+# CONTRIBUTED EXTENSIONS
+#
+# Please read the file "contrib/extensions.ac" before making changes to this
+# file.
+#
+# Include the ARM NEON extension:
+#include %reldir%/neon/neon.am