xref: /third_party/libpng/huawei_libpng_CMakeList.patch (revision 5bec5421)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8652564b6..639554ad8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,1040 +1,26 @@
-# CMakeLists.txt
-
-# Copyright (c) 2018-2022 Cosmin Truta
-# Copyright (c) 2007,2009-2018 Glenn Randers-Pehrson
-# Written by Christian Ehrlicher, 2007
-# Revised by Roger Lowman, 2009-2010
-# Revised by Clifford Yapp, 2011-2012,2017
-# Revised by Roger Leigh, 2016
-# Revised by Andreas Franek, 2016
-# Revised by Sam Serrels, 2017
-# Revised by Vadim Barkov, 2017
-# Revised by Vicky Pfau, 2018
-# Revised by Cameron Cawley, 2018,2021
-# Revised by Kyle Bentley, 2018
-# Revised by David Callu, 2020
-# Revised by Steve Robinson, 2020
-# Revised by Simon Hausmann, 2020
-# Revised by Alex Gaynor, 2020
-# Revised by Owen Rudge, 2020
-# Revised by Gleb Mazovetskiy, 2021
-# Revised by Christopher Sean Morrison, 2022
-
-# This code is released under the libpng license.
-# For conditions of distribution and use, see the disclaimer
-# and license in png.h
-
-cmake_minimum_required(VERSION 3.1)
-cmake_policy(VERSION 3.1)
-
-project(libpng C ASM)
-enable_testing()
-
-set(PNGLIB_MAJOR 1)
-set(PNGLIB_MINOR 6)
-set(PNGLIB_REVISION 38)
-set(PNGLIB_SUBREVISION 0)
-#set(PNGLIB_SUBREVISION "git")
-set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
-set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_REVISION})
-set(PNGLIB_SHARED_SOVERSION ${PNGLIB_MAJOR}${PNGLIB_MINOR})
-set(PNGLIB_SHARED_VERSION ${PNGLIB_SHARED_SOVERSION}.${PNGLIB_REVISION}.${PNGLIB_SUBREVISION})
-
-include(GNUInstallDirs)
-
-# Allow users to specify location of zlib.
-# Useful if zlib is being built alongside this as a sub-project.
-option(PNG_BUILD_ZLIB "Custom zlib Location, else find_package is used" OFF)
-
-if(NOT PNG_BUILD_ZLIB)
-  find_package(ZLIB REQUIRED)
-  include_directories(${ZLIB_INCLUDE_DIRS})
-endif()
-
-if(UNIX AND NOT APPLE AND NOT BEOS AND NOT HAIKU AND NOT EMSCRIPTEN)
-  find_library(M_LIBRARY m)
-  if(NOT M_LIBRARY)
-    set(M_LIBRARY "")
-  endif()
-else()
-  # libm is not needed and/or not available.
-  set(M_LIBRARY "")
-endif()
-
-# Public CMake configuration variables.
-option(PNG_SHARED "Build shared lib" ON)
-option(PNG_STATIC "Build static lib" ON)
-option(PNG_EXECUTABLES "Build libpng executables" ON)
-option(PNG_TESTS "Build libpng tests" ON)
-
-# Many more configuration options could be added here.
-option(PNG_FRAMEWORK "Build OS X framework" OFF)
-option(PNG_DEBUG "Build with debug output" OFF)
-option(PNG_HARDWARE_OPTIMIZATIONS "Enable hardware optimizations" ON)
-
-set(PNG_PREFIX "" CACHE STRING "Prefix to add to the API function names")
-set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")
-
-# CMake currently sets CMAKE_SYSTEM_PROCESSOR to one of x86_64 or arm64 on macOS,
-# based upon the OS architecture, not the target architecture. As such, we need
-# to check CMAKE_OSX_ARCHITECTURES to identify which hardware-specific flags to
-# enable. Note that this will fail if you attempt to build a universal binary in
-# a single CMake invocation.
-if (APPLE AND CMAKE_OSX_ARCHITECTURES)
-  set(TARGET_ARCH ${CMAKE_OSX_ARCHITECTURES})
-else()
-  set(TARGET_ARCH ${CMAKE_SYSTEM_PROCESSOR})
-endif()
-
-if(PNG_HARDWARE_OPTIMIZATIONS)
-
-# Set definitions and sources for ARM.
-if(TARGET_ARCH MATCHES "^arm" OR
-   TARGET_ARCH MATCHES "^aarch64")
-  if(TARGET_ARCH MATCHES "^arm64" OR
-     TARGET_ARCH MATCHES "^aarch64")
-    set(PNG_ARM_NEON_POSSIBLE_VALUES on off)
-    set(PNG_ARM_NEON "on"
-        CACHE STRING "Enable ARM NEON optimizations: on|off; on is default")
-  else()
-    set(PNG_ARM_NEON_POSSIBLE_VALUES check on off)
-    set(PNG_ARM_NEON "check"
-        CACHE STRING "Enable ARM NEON optimizations: check|on|off; check is default")
-  endif()
-  set_property(CACHE PNG_ARM_NEON
-               PROPERTY STRINGS ${PNG_ARM_NEON_POSSIBLE_VALUES})
-  list(FIND PNG_ARM_NEON_POSSIBLE_VALUES ${PNG_ARM_NEON} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR "PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_ARM_NEON} STREQUAL "off")
-    set(libpng_arm_sources
-        arm/arm_init.c
-        arm/filter_neon.S
-        arm/filter_neon_intrinsics.c
-        arm/palette_neon_intrinsics.c)
-    if(${PNG_ARM_NEON} STREQUAL "on")
-      add_definitions(-DPNG_ARM_NEON_OPT=2)
-    elseif(${PNG_ARM_NEON} STREQUAL "check")
-      add_definitions(-DPNG_ARM_NEON_CHECK_SUPPORTED)
-    endif()
-  else()
-    add_definitions(-DPNG_ARM_NEON_OPT=0)
-  endif()
-endif()
-
-# Set definitions and sources for PowerPC.
-if(TARGET_ARCH MATCHES "^powerpc*" OR
-   TARGET_ARCH MATCHES "^ppc64*")
-  set(PNG_POWERPC_VSX_POSSIBLE_VALUES on off)
-  set(PNG_POWERPC_VSX "on"
-      CACHE STRING "Enable POWERPC VSX optimizations: on|off; on is default")
-  set_property(CACHE PNG_POWERPC_VSX
-               PROPERTY STRINGS ${PNG_POWERPC_VSX_POSSIBLE_VALUES})
-  list(FIND PNG_POWERPC_VSX_POSSIBLE_VALUES ${PNG_POWERPC_VSX} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR "PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_POWERPC_VSX} STREQUAL "off")
-    set(libpng_powerpc_sources
-        powerpc/powerpc_init.c
-        powerpc/filter_vsx_intrinsics.c)
-    if(${PNG_POWERPC_VSX} STREQUAL "on")
-      add_definitions(-DPNG_POWERPC_VSX_OPT=2)
-    endif()
-  else()
-    add_definitions(-DPNG_POWERPC_VSX_OPT=0)
-  endif()
-endif()
-
-# Set definitions and sources for Intel.
-if(TARGET_ARCH MATCHES "^i?86" OR
-   TARGET_ARCH MATCHES "^x86_64*")
-  set(PNG_INTEL_SSE_POSSIBLE_VALUES on off)
-  set(PNG_INTEL_SSE "on"
-      CACHE STRING "Enable INTEL_SSE optimizations: on|off; on is default")
-  set_property(CACHE PNG_INTEL_SSE
-               PROPERTY STRINGS ${PNG_INTEL_SSE_POSSIBLE_VALUES})
-  list(FIND PNG_INTEL_SSE_POSSIBLE_VALUES ${PNG_INTEL_SSE} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR "PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_INTEL_SSE} STREQUAL "off")
-    set(libpng_intel_sources
-        intel/intel_init.c
-        intel/filter_sse2_intrinsics.c)
-    if(${PNG_INTEL_SSE} STREQUAL "on")
-      add_definitions(-DPNG_INTEL_SSE_OPT=1)
-    endif()
-  else()
-    add_definitions(-DPNG_INTEL_SSE_OPT=0)
-  endif()
-endif()
-
-# Set definitions and sources for MIPS.
-if(TARGET_ARCH MATCHES "mipsel*" OR
-   TARGET_ARCH MATCHES "mips64el*")
-  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
-  set(PNG_MIPS_MSA "on"
-      CACHE STRING "Enable MIPS_MSA optimizations: on|off; on is default")
-  set_property(CACHE PNG_MIPS_MSA
-               PROPERTY STRINGS ${PNG_MIPS_MSA_POSSIBLE_VALUES})
-  list(FIND PNG_MIPS_MSA_POSSIBLE_VALUES ${PNG_MIPS_MSA} index)
-  if(index EQUAL -1)
-    message(FATAL_ERROR "PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
-  elseif(NOT ${PNG_MIPS_MSA} STREQUAL "off")
-    set(libpng_mips_sources
-        mips/mips_init.c
-        mips/filter_msa_intrinsics.c)
-    if(${PNG_MIPS_MSA} STREQUAL "on")
-      add_definitions(-DPNG_MIPS_MSA_OPT=2)
-    endif()
-  else()
-    add_definitions(-DPNG_MIPS_MSA_OPT=0)
-  endif()
-endif()
-
-else(PNG_HARDWARE_OPTIMIZATIONS)
-
-# Set definitions and sources for ARM.
-if(TARGET_ARCH MATCHES "^arm" OR
-   TARGET_ARCH MATCHES "^aarch64")
-  add_definitions(-DPNG_ARM_NEON_OPT=0)
-endif()
-
-# Set definitions and sources for PowerPC.
-if(TARGET_ARCH MATCHES "^powerpc*" OR
-   TARGET_ARCH MATCHES "^ppc64*")
-  add_definitions(-DPNG_POWERPC_VSX_OPT=0)
-endif()
-
-# Set definitions and sources for Intel.
-if(TARGET_ARCH MATCHES "^i?86" OR
-   TARGET_ARCH MATCHES "^x86_64*")
-  add_definitions(-DPNG_INTEL_SSE_OPT=0)
-endif()
-
-# Set definitions and sources for MIPS.
-if(TARGET_ARCH MATCHES "mipsel*" OR
-   TARGET_ARCH MATCHES "mips64el*")
-  add_definitions(-DPNG_MIPS_MSA_OPT=0)
-endif()
-
-endif(PNG_HARDWARE_OPTIMIZATIONS)
-
-# Set PNG_LIB_NAME.
-set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})
-
-# Distinguish between debug and release builds.
-set(CMAKE_DEBUG_POSTFIX "d")
-
-include(CheckCSourceCompiles)
-option(ld-version-script "Enable linker version script" ON)
-if(ld-version-script AND NOT ANDROID AND NOT APPLE)
-  # Check if LD supports linker scripts.
-  file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "
-VERS_1 {
-        global: sym;
-        local: *;
-};
-
-VERS_2 {
-        global: sym2;
-                main;
-} VERS_1;
-")
-  set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
-  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS} "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/conftest.map'")
-  check_c_source_compiles("void sym(void) {}
-void sym2(void) {}
-int main(void) {return 0;}
-" HAVE_LD_VERSION_SCRIPT)
-  if(NOT HAVE_LD_VERSION_SCRIPT)
-    set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE} "-Wl,-M -Wl,${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
-  check_c_source_compiles("void sym(void) {}
-void sym2(void) {}
-int main(void) {return 0;}
-" HAVE_SOLARIS_LD_VERSION_SCRIPT)
-  endif()
-  set(CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS_SAVE})
-  file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
-endif()
-
-# Find symbol prefix.  Likely obsolete and unnecessary with recent
-# toolchains (it's not done in many other projects).
-function(symbol_prefix)
-  set(SYMBOL_PREFIX)
-
-  execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E" "-"
-                  INPUT_FILE /dev/null
-                  OUTPUT_VARIABLE OUT
-                  RESULT_VARIABLE STATUS)
-
-  if(CPP_FAIL)
-    message(WARNING "Failed to run the C preprocessor")
-  endif()
-
-  string(REPLACE "\n" ";" OUT "${OUT}")
-  foreach(line ${OUT})
-    string(REGEX MATCH "^PREFIX=" found_match "${line}")
-    if(found_match)
-      string(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
-      string(REGEX MATCH "__USER_LABEL_PREFIX__" found_match "${prefix}")
-      if(found_match)
-        string(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
-      endif()
-      set(SYMBOL_PREFIX "${prefix}")
-    endif()
-  endforeach()
-
-  message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
-  set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
-endfunction()
-
-if(UNIX)
-  symbol_prefix()
-endif()
-
-find_program(AWK NAMES gawk awk)
-
-include_directories(${CMAKE_CURRENT_BINARY_DIR})
-
-if(NOT AWK OR ANDROID OR IOS)
-  # No awk available to generate sources; use pre-built pnglibconf.h
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
-                 ${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
-  add_custom_target(genfiles) # Dummy
-else()
-  # Copy the awk scripts, converting their line endings to Unix (LF)
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/checksym.awk
-                 ${CMAKE_CURRENT_BINARY_DIR}/scripts/checksym.awk
-                 @ONLY
-                 NEWLINE_STYLE LF)
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/options.awk
-                 ${CMAKE_CURRENT_BINARY_DIR}/scripts/options.awk
-                 @ONLY
-                 NEWLINE_STYLE LF)
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/dfn.awk
-                 ${CMAKE_CURRENT_BINARY_DIR}/scripts/dfn.awk
-                 @ONLY
-                 NEWLINE_STYLE LF)
-
-  # Generate .chk from .out with awk:
-  # generate_chk(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  include(CMakeParseArguments)
-  function(generate_chk)
-    set(options)
-    set(oneValueArgs INPUT OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if(NOT _GC_INPUT)
-      message(FATAL_ERROR "generate_chk: Missing INPUT argument")
-    endif()
-    if(NOT _GC_OUTPUT)
-      message(FATAL_ERROR "generate_chk: Missing OUTPUT argument")
-    endif()
-
-    add_custom_command(OUTPUT "${_GC_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DINPUT=${_GC_INPUT}"
-                               "-DOUTPUT=${_GC_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake"
-                       DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Generate .out from .c with awk
-  # generate_out(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_out)
-    set(options)
-    set(oneValueArgs INPUT OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if(NOT _GO_INPUT)
-      message(FATAL_ERROR "generate_out: Missing INPUT argument")
-    endif()
-    if(NOT _GO_OUTPUT)
-      message(FATAL_ERROR "generate_out: Missing OUTPUT argument")
-    endif()
-
-    add_custom_command(OUTPUT "${_GO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DINPUT=${_GO_INPUT}"
-                               "-DOUTPUT=${_GO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake"
-                       DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Generate specific source file with awk
-  # generate_source(OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_source)
-    set(options)
-    set(oneValueArgs OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GSO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    if(NOT _GSO_OUTPUT)
-      message(FATAL_ERROR "generate_source: Missing OUTPUT argument")
-    endif()
-
-    add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               "-DOUTPUT=${_GSO_OUTPUT}"
-                               -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
-                       DEPENDS ${_GSO_DEPENDS}
-                       WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-  endfunction()
-
-  # Copy file
-  # generate_copy(INPUT inputfile OUTPUT outputfile [DEPENDS dep1 [dep2...]])
-  function(generate_copy)
-    set(options)
-    set(oneValueArgs INPUT OUTPUT)
-    set(multiValueArgs DEPENDS)
-    cmake_parse_arguments(_GCO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-    add_custom_command(OUTPUT "${_GCO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               -E remove "${_GCO_OUTPUT}"
-                       COMMAND "${CMAKE_COMMAND}"
-                               -E copy "${_GCO_INPUT}" "${_GCO_OUTPUT}"
-                       DEPENDS "${source}" ${_GCO_DEPENDS})
-  endfunction()
-
-  # Generate scripts/pnglibconf.h
-  generate_source(OUTPUT "scripts/pnglibconf.c"
-                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
-                          "${CMAKE_CURRENT_BINARY_DIR}/scripts/options.awk"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
-  add_custom_target(scripts_pnglibconf_c DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c")
-
-  # Generate pnglibconf.c
-  generate_source(OUTPUT "pnglibconf.c"
-                  DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.dfa"
-                          "${CMAKE_CURRENT_BINARY_DIR}/scripts/options.awk"
-                          "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h")
-  add_custom_target(pnglibconf_c DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c")
-
-  if(PNG_PREFIX)
-    set(PNGLIBCONF_H_EXTRA_DEPENDS
-        "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
-        "${CMAKE_CURRENT_SOURCE_DIR}/scripts/macro.lst")
-    set(PNGPREFIX_H_EXTRA_DEPENDS
-        "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out")
-  endif()
-
-  generate_out(INPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out"
-               DEPENDS pnglibconf_c)
-  add_custom_target(pnglibconf_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out")
-
-  # Generate pnglibconf.h
-  generate_source(OUTPUT "pnglibconf.h"
-                  DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out" pnglibconf_out
-                          ${PNGLIBCONF_H_EXTRA_DEPENDS})
-  add_custom_target(pnglibconf_h DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/intprefix.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out"
-               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
-  add_custom_target(scripts_intprefix_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/prefix.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out" pnglibconf_out)
-  add_custom_target(scripts_prefix_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out")
-
-  # Generate pngprefix.h
-  generate_source(OUTPUT "pngprefix.h"
-                  DEPENDS ${PNGPREFIX_H_EXTRA_DEPENDS})
-  add_custom_target(pngprefix_h DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/sym.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
-               DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
-  add_custom_target(scripts_sym_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt")
-  add_custom_target(scripts_symbols_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out")
-
-  generate_out(INPUT "${CMAKE_CURRENT_SOURCE_DIR}/scripts/vers.c"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
-               DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/png.h"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/pngconf.h"
-                       "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
-  add_custom_target(scripts_vers_out DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out")
-
-  generate_chk(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out"
-               OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk"
-               DEPENDS scripts_symbols_out
-                       "${CMAKE_CURRENT_BINARY_DIR}/scripts/checksym.awk"
-                       "${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.def")
-
-  add_custom_target(scripts_symbols_chk
-                    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk")
-
-  generate_copy(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
-                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym"
-                DEPENDS scripts_sym_out)
-  generate_copy(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
-                OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers"
-                DEPENDS scripts_vers_out)
-
-  add_custom_target(genvers
-                    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
-  add_custom_target(gensym
-                    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
-
-  add_custom_target("genprebuilt"
-                    COMMAND "${CMAKE_COMMAND}"
-                            "-DOUTPUT=scripts/pnglibconf.h.prebuilt"
-                            -P "${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake"
-                    WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-
-  # A single target handles generation of all generated files.
-  add_custom_target(genfiles
-                    DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym" gensym
-                            "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers" genvers
-                            "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.c" pnglibconf_c
-                            "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h
-                            "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out" pnglibconf_out
-                            "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h" pngprefix_h
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out" scripts_intprefix_out
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c" scripts_pnglibconf_c
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out" scripts_prefix_out
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out" scripts_sym_out
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk" scripts_symbols_chk
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out" scripts_symbols_out
-                            "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out" scripts_vers_out)
-endif(NOT AWK OR ANDROID OR IOS)
-
-# List the source code files.
-set(libpng_public_hdrs
-    png.h
-    pngconf.h
-    "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
-)
-set(libpng_private_hdrs
-    pngpriv.h
-    pngdebug.h
-    pnginfo.h
-    pngstruct.h
-)
-if(AWK AND NOT ANDROID AND NOT IOS)
-  list(APPEND libpng_private_hdrs "${CMAKE_CURRENT_BINARY_DIR}/pngprefix.h")
-endif()
-set(libpng_sources
-    ${libpng_public_hdrs}
-    ${libpng_private_hdrs}
-    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
-    ${libpng_arm_sources}
-    ${libpng_intel_sources}
-    ${libpng_mips_sources}
-    ${libpng_powerpc_sources}
-)
-set(pngtest_sources
-    pngtest.c
-)
-set(pngvalid_sources
-    contrib/libtests/pngvalid.c
-)
-set(pngstest_sources
-    contrib/libtests/pngstest.c
-)
-set(pngunknown_sources
-    contrib/libtests/pngunknown.c
-)
-set(pngimage_sources
-    contrib/libtests/pngimage.c
-)
-set(pngfix_sources
-    contrib/tools/pngfix.c
-)
-set(png_fix_itxt_sources
-    contrib/tools/png-fix-itxt.c
-)
-
-if(MSVC)
-  add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
-endif()
-
-if(PNG_DEBUG)
-  add_definitions(-DPNG_DEBUG)
-endif()
-
-# Now build our target.
-include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${ZLIB_INCLUDE_DIRS})
-
-unset(PNG_LIB_TARGETS)
-
-if(PNG_SHARED)
-  add_library(png SHARED ${libpng_sources})
-  set(PNG_LIB_TARGETS png)
-  set_target_properties(png PROPERTIES OUTPUT_NAME ${PNG_LIB_NAME})
-  add_dependencies(png genfiles)
-  if(MSVC)
-    # MVC does not append 'lib'. Do it here, to have consistent name.
-    set_target_properties(png PROPERTIES PREFIX "lib")
-    set_target_properties(png PROPERTIES IMPORT_PREFIX "lib")
-  endif()
-  target_link_libraries(png ${ZLIB_LIBRARIES} ${M_LIBRARY})
-
-  if(UNIX AND AWK)
-    if(HAVE_LD_VERSION_SCRIPT)
-      set_target_properties(png PROPERTIES
-                            LINK_FLAGS "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
-    elseif(HAVE_SOLARIS_LD_VERSION_SCRIPT)
-      set_target_properties(png PROPERTIES
-                            LINK_FLAGS "-Wl,-M -Wl,'${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
-    endif()
-  endif()
-endif()
-
-if(PNG_STATIC)
-  # does not work without changing name
-  set(PNG_LIB_NAME_STATIC png_static)
-  add_library(png_static STATIC ${libpng_sources})
-  add_dependencies(png_static genfiles)
-  # MSVC doesn't use a different file extension for shared vs. static
-  # libs. We are able to change OUTPUT_NAME to remove the _static
-  # for all other platforms.
-  if(NOT MSVC)
-    set_target_properties(png_static PROPERTIES
-                          OUTPUT_NAME "${PNG_LIB_NAME}"
-                          CLEAN_DIRECT_OUTPUT 1)
-  else()
-    set_target_properties(png_static PROPERTIES
-                          OUTPUT_NAME "${PNG_LIB_NAME}_static"
-                          CLEAN_DIRECT_OUTPUT 1)
-  endif()
-  list(APPEND PNG_LIB_TARGETS png_static)
-  if(MSVC)
-    # MSVC does not append 'lib'. Do it here, to have consistent name.
-    set_target_properties(png_static PROPERTIES PREFIX "lib")
-  endif()
-  target_link_libraries(png_static ${ZLIB_LIBRARIES} ${M_LIBRARY})
-endif()
-
-if(PNG_FRAMEWORK)
-  set(PNG_LIB_NAME_FRAMEWORK png_framework)
-  add_library(png_framework SHARED ${libpng_sources})
-  add_dependencies(png_framework genfiles)
-  list(APPEND PNG_LIB_TARGETS png_framework)
-  set_target_properties(png_framework PROPERTIES
-                        FRAMEWORK TRUE
-                        FRAMEWORK_VERSION ${PNGLIB_VERSION}
-                        MACOSX_FRAMEWORK_SHORT_VERSION_STRING ${PNGLIB_MAJOR}.${PNGLIB_MINOR}
-                        MACOSX_FRAMEWORK_BUNDLE_VERSION ${PNGLIB_VERSION}
-                        MACOSX_FRAMEWORK_IDENTIFIER org.libpng.libpng
-                        XCODE_ATTRIBUTE_INSTALL_PATH "@rpath"
-                        PUBLIC_HEADER "${libpng_public_hdrs}"
-                        OUTPUT_NAME png)
-  target_link_libraries(png_framework ${ZLIB_LIBRARIES} ${M_LIBRARY})
-endif()
-
-if(NOT PNG_LIB_TARGETS)
-  message(SEND_ERROR "No library variant selected to build. "
-                     "Please enable at least one of the following options: "
-                     "PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
-endif()
-
-if(PNG_SHARED AND WIN32)
-  set_target_properties(png PROPERTIES
-                        DEFINE_SYMBOL PNG_BUILD_DLL)
-endif()
-
-function(png_add_test)
-  set(options)
-  set(oneValueArgs NAME COMMAND)
-  set(multiValueArgs OPTIONS FILES)
-  cmake_parse_arguments(_PAT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
-
-  if(NOT _PAT_NAME)
-    message(FATAL_ERROR "png_add_test: Missing NAME argument")
-  endif()
-  if(NOT _PAT_COMMAND)
-    message(FATAL_ERROR "png_add_test: Missing COMMAND argument")
-  endif()
-
-  set(TEST_OPTIONS "${_PAT_OPTIONS}")
-  set(TEST_FILES "${_PAT_FILES}")
-
-  configure_file("${CMAKE_CURRENT_SOURCE_DIR}/scripts/test.cmake.in"
-                 "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake"
-                 @ONLY)
-  add_test(NAME "${_PAT_NAME}"
-           COMMAND "${CMAKE_COMMAND}"
-                   "-DLIBPNG=$<TARGET_FILE:png>"
-                   "-DTEST_COMMAND=$<TARGET_FILE:${_PAT_COMMAND}>"
-                   -P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
-endfunction()
-
-if(PNG_TESTS AND PNG_SHARED)
-  # Find test PNG files by globbing, but sort lists to ensure
-  # consistency between different filesystems.
-  file(GLOB PNGSUITE_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/*.png")
-  list(SORT PNGSUITE_PNGS)
-  file(GLOB TEST_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/*.png")
-  list(SORT TEST_PNGS)
-
-  set(PNGTEST_PNG "${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png")
-
-  add_executable(pngtest ${pngtest_sources})
-  target_link_libraries(pngtest png)
-
-  png_add_test(NAME pngtest
-               COMMAND pngtest
-               FILES "${PNGTEST_PNG}")
-
-  add_executable(pngvalid ${pngvalid_sources})
-  target_link_libraries(pngvalid png)
-
-  png_add_test(NAME pngvalid-gamma-16-to-8
-               COMMAND pngvalid
-               OPTIONS --gamma-16-to-8)
-  png_add_test(NAME pngvalid-gamma-alpha-mode
-               COMMAND pngvalid
-               OPTIONS --gamma-alpha-mode)
-  png_add_test(NAME pngvalid-gamma-background
-               COMMAND pngvalid
-               OPTIONS --gamma-background)
-  png_add_test(NAME pngvalid-gamma-expand16-alpha-mode
-               COMMAND pngvalid
-               OPTIONS --gamma-alpha-mode --expand16)
-  png_add_test(NAME pngvalid-gamma-expand16-background
-               COMMAND pngvalid
-               OPTIONS --gamma-background --expand16)
-  png_add_test(NAME pngvalid-gamma-expand16-transform
-               COMMAND pngvalid
-               OPTIONS --gamma-transform --expand16)
-  png_add_test(NAME pngvalid-gamma-sbit
-               COMMAND pngvalid
-               OPTIONS --gamma-sbit)
-  png_add_test(NAME pngvalid-gamma-threshold
-               COMMAND pngvalid
-               OPTIONS --gamma-threshold)
-  png_add_test(NAME pngvalid-gamma-transform
-               COMMAND pngvalid
-               OPTIONS --gamma-transform)
-  png_add_test(NAME pngvalid-progressive-interlace-standard
-               COMMAND pngvalid
-               OPTIONS --standard --progressive-read --interlace)
-  png_add_test(NAME pngvalid-progressive-size
-               COMMAND pngvalid
-               OPTIONS --size --progressive-read)
-  png_add_test(NAME pngvalid-progressive-standard
-               COMMAND pngvalid
-               OPTIONS --standard --progressive-read)
-  png_add_test(NAME pngvalid-standard
-               COMMAND pngvalid
-               OPTIONS --standard)
-  png_add_test(NAME pngvalid-transform
-               COMMAND pngvalid
-               OPTIONS --transform)
-
-  add_executable(pngstest ${pngstest_sources})
-  target_link_libraries(pngstest png)
-
-  foreach(gamma_type 1.8 linear none sRGB)
-    foreach(alpha_type none alpha)
-      set(PNGSTEST_FILES)
-      foreach(test_png ${TEST_PNGS})
-        string(REGEX MATCH ".*-linear[-.].*" TEST_PNG_LINEAR "${test_png}")
-        string(REGEX MATCH ".*-sRGB[-.].*" TEST_PNG_SRGB "${test_png}")
-        string(REGEX MATCH ".*-1.8[-.].*" TEST_PNG_G18 "${test_png}")
-        string(REGEX MATCH ".*-alpha-.*" TEST_PNG_ALPHA "${test_png}")
-
-        set(TEST_PNG_VALID TRUE)
-
-        if(TEST_PNG_ALPHA)
-          if(NOT "${alpha_type}" STREQUAL "alpha")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        else()
-          if("${alpha_type}" STREQUAL "alpha")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        endif()
-
-        if(TEST_PNG_LINEAR)
-          if(NOT "${gamma_type}" STREQUAL "linear")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        elseif(TEST_PNG_SRGB)
-          if(NOT "${gamma_type}" STREQUAL "sRGB")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        elseif(TEST_PNG_G18)
-          if(NOT "${gamma_type}" STREQUAL "1.8")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        else()
-          if(NOT "${gamma_type}" STREQUAL "none")
-            set(TEST_PNG_VALID FALSE)
-          endif()
-        endif()
-
-        if(TEST_PNG_VALID)
-          list(APPEND PNGSTEST_FILES "${test_png}")
-        endif()
-      endforeach()
-      # Should already be sorted, but sort anyway to be certain.
-      list(SORT PNGSTEST_FILES)
-      png_add_test(NAME pngstest-${gamma_type}-${alpha_type}
-                   COMMAND pngstest
-                   OPTIONS --tmpfile "${gamma_type}-${alpha_type}-" --log
-                   FILES ${PNGSTEST_FILES})
-    endforeach()
-  endforeach()
-
-  add_executable(pngunknown ${pngunknown_sources})
-  target_link_libraries(pngunknown png)
-
-  png_add_test(NAME pngunknown-discard
-               COMMAND pngunknown
-               OPTIONS --strict default=discard
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-IDAT
-               COMMAND pngunknown
-               OPTIONS --strict default=discard IDAT=save
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-if-safe
-               COMMAND pngunknown
-               OPTIONS --strict default=if-safe
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-sAPI
-               COMMAND pngunknown
-               OPTIONS --strict bKGD=save cHRM=save gAMA=save all=discard iCCP=save sBIT=save sRGB=save
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-save
-               COMMAND pngunknown
-               OPTIONS --strict default=save
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-sTER
-               COMMAND pngunknown
-               OPTIONS --strict sTER=if-safe
-               FILES "${PNGTEST_PNG}")
-  png_add_test(NAME pngunknown-vpAg
-               COMMAND pngunknown
-               OPTIONS --strict vpAg=if-safe
-               FILES "${PNGTEST_PNG}")
-
-  add_executable(pngimage ${pngimage_sources})
-  target_link_libraries(pngimage png)
-
-  png_add_test(NAME pngimage-quick
-               COMMAND pngimage
-               OPTIONS --list-combos --log
-               FILES ${PNGSUITE_PNGS})
-  png_add_test(NAME pngimage-full
-               COMMAND pngimage
-               OPTIONS --exhaustive --list-combos --log
-               FILES ${PNGSUITE_PNGS})
-endif()
-
-if(PNG_SHARED AND PNG_EXECUTABLES)
-  add_executable(pngfix ${pngfix_sources})
-  target_link_libraries(pngfix png)
-  set(PNG_BIN_TARGETS pngfix)
-
-  add_executable(png-fix-itxt ${png_fix_itxt_sources})
-  target_link_libraries(png-fix-itxt ${ZLIB_LIBRARIES} ${M_LIBRARY})
-  list(APPEND PNG_BIN_TARGETS png-fix-itxt)
-endif()
-
-# Creates a symlink from src to dest (if possible), or, alternatively,
-# copies src to dest if different.
-include(CMakeParseArguments)
-function(create_symlink DEST_FILE)
-  cmake_parse_arguments(S "" "FILE;TARGET" "" ${ARGN})
-
-  if(NOT S_TARGET AND NOT S_FILE)
-    message(FATAL_ERROR "create_symlink: Missing TARGET or FILE argument")
-  endif()
-
-  if(S_TARGET AND S_FILE)
-    message(FATAL_ERROR "create_symlink: "
-                        "Both source file ${S_FILE} and build target ${S_TARGET} arguments are present; "
-                        "can only have one")
-  endif()
-
-  if(S_FILE)
-    # If we don't need to symlink something that's coming from a build target,
-    # we can go ahead and symlink/copy at configure time.
-    if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
-      execute_process(COMMAND "${CMAKE_COMMAND}"
-                              -E copy_if_different
-                              ${S_FILE} ${DEST_FILE}
-                      WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-    else()
-      execute_process(COMMAND "${CMAKE_COMMAND}"
-                              -E create_symlink
-                              ${S_FILE} ${DEST_FILE}
-                      WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
-    endif()
-  endif()
-
-  if(S_TARGET)
-    # We need to use generator expressions, which can be a bit tricky.
-    # For simplicity, make the symlink a POST_BUILD step, and use the TARGET
-    # signature of add_custom_command.
-    if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
-      add_custom_command(TARGET ${S_TARGET}
-                         POST_BUILD
-                         COMMAND "${CMAKE_COMMAND}"
-                                 -E copy_if_different
-                                 $<TARGET_LINKER_FILE_NAME:${S_TARGET}>
-                                 $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
-    else()
-      add_custom_command(TARGET ${S_TARGET}
-                         POST_BUILD
-                         COMMAND "${CMAKE_COMMAND}"
-                                 -E create_symlink
-                                 $<TARGET_LINKER_FILE_NAME:${S_TARGET}>
-                                 $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
-    endif()
-  endif()
-endfunction()
-
-# Create source generation scripts.
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genchk.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genchk.cmake
-               @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/genout.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/genout.cmake
-               @ONLY)
-configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
-               ${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake
-               @ONLY)
-
-# libpng is a library so default to 'lib'
-if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
-  set(CMAKE_INSTALL_LIBDIR lib)
-endif()
-
-# Create pkgconfig files.
-# We use the same files like ./configure, so we have to set its vars.
-# Only do this on Windows for Cygwin - the files don't make much sense
-# outside of a UNIX look-alike.
-if(NOT WIN32 OR CYGWIN OR MINGW)
-  set(prefix      ${CMAKE_INSTALL_PREFIX})
-  set(exec_prefix ${CMAKE_INSTALL_PREFIX})
-  set(libdir      ${CMAKE_INSTALL_FULL_LIBDIR})
-  set(includedir  ${CMAKE_INSTALL_FULL_INCLUDEDIR})
-  set(LIBS        "-lz -lm")
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
-                 ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
-                 @ONLY)
-  create_symlink(libpng.pc FILE ${PNGLIB_NAME}.pc)
-  configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
-                 ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
-                 @ONLY)
-  create_symlink(libpng-config FILE ${PNGLIB_NAME}-config)
-endif()
-
-# Set up links.
-if(PNG_SHARED)
-  set_target_properties(png PROPERTIES
-    VERSION ${PNGLIB_SHARED_VERSION}
-    SOVERSION ${PNGLIB_SHARED_SOVERSION}
-    CLEAN_DIRECT_OUTPUT 1)
-endif()
-
-# Install.
-if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL)
-  install(TARGETS ${PNG_LIB_TARGETS}
-          EXPORT libpng
-          RUNTIME DESTINATION bin
-          LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
-          ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
-          FRAMEWORK DESTINATION ${CMAKE_INSTALL_LIBDIR})
-
-  if(PNG_SHARED)
-    # Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
-    if(CYGWIN OR MINGW)
-      create_symlink(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX}
-              DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif()
-
-    if(NOT WIN32)
-      create_symlink(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_SHARED_LIBRARY_SUFFIX}
-              DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif()
-  endif()
-
-  if(PNG_STATIC)
-    if(NOT WIN32 OR CYGWIN OR MINGW)
-      create_symlink(libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
-      install(FILES $<TARGET_LINKER_FILE_DIR:png_static>/libpng${CMAKE_STATIC_LIBRARY_SUFFIX}
-              DESTINATION ${CMAKE_INSTALL_LIBDIR})
-    endif()
-  endif()
-endif()
-
-if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL)
-  install(FILES ${libpng_public_hdrs}
-          DESTINATION include)
-  install(FILES ${libpng_public_hdrs}
-          DESTINATION include/${PNGLIB_NAME})
-endif()
-if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL)
-  if(NOT WIN32 OR CYGWIN OR MINGW)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
-            DESTINATION bin)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
-            DESTINATION bin)
-  endif()
-endif()
-
-if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL)
-  install(TARGETS ${PNG_BIN_TARGETS}
-          RUNTIME DESTINATION bin)
-endif()
-
-if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL)
-  # Install the man pages.
-  install(FILES libpng.3 libpngpf.3
-          DESTINATION ${CMAKE_INSTALL_MANDIR}/man3)
-  install(FILES png.5
-          DESTINATION ${CMAKE_INSTALL_MANDIR}/man5)
-  # Install the pkg-config files.
-  if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
-            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config
-            DESTINATION ${CMAKE_INSTALL_BINDIR})
-    install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc
-            DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
-    install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
-            DESTINATION ${CMAKE_INSTALL_BINDIR})
-  endif()
-endif()
-
-# Create an export file that CMake users can include() to import our targets.
-if(NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL)
-  install(EXPORT libpng
-          DESTINATION lib/libpng
-          FILE lib${PNG_LIB_NAME}.cmake)
-endif()
-
-# TODO: Create MSVC import lib for MinGW-compiled shared lib.
-# pexports libpng.dll > libpng.def
-# lib /def:libpng.def /machine:x86
+cmake_minimum_required(VERSION 3.16.5)
+
+set(LibpngInc "${PROJECT_SOURCE_DIR}/third_party/libpng")
+set(LibpngSrc "${PROJECT_SOURCE_DIR}/third_party/libpng")
+
+include_directories(${LibpngInc})
+message(${LibpngSrc})
+add_library(libpng STATIC
+    ${LibpngSrc}/png.c
+    ${LibpngSrc}/pngerror.c
+    ${LibpngSrc}/pngget.c
+    ${LibpngSrc}/pngmem.c
+    ${LibpngSrc}/pngpread.c
+    ${LibpngSrc}/pngread.c
+    ${LibpngSrc}/pngrio.c
+    ${LibpngSrc}/pngrtran.c
+    ${LibpngSrc}/pngrutil.c
+    ${LibpngSrc}/pngset.c
+    ${LibpngSrc}/pngtrans.c
+    ${LibpngSrc}/pngwio.c
+    ${LibpngSrc}/pngwrite.c
+    ${LibpngSrc}/pngwtran.c
+    ${LibpngSrc}/pngwutil.c
+    )
+target_link_libraries(libpng PUBLIC zlib)
+target_include_directories(libpng PUBLIC ${LibpngInc})