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CMakeLists.txt
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# CMakeLists.txt - CMake lists for libpng
#
# Copyright (c) 2018-2024 Cosmin Truta.
# Copyright (c) 2007-2018 Glenn Randers-Pehrson.
# Originally written by Christian Ehrlicher, 2007.
#
# Use, modification and distribution are subject to
# the same licensing terms and conditions as libpng.
# Please see the copyright notice in png.h or visit
# http://libpng.org/pub/png/src/libpng-LICENSE.txt
#
# For copyright and licensing purposes, please see
# the accompanying file scripts/cmake/AUTHORS.md
#
# SPDX-License-Identifier: libpng-2.0
cmake_minimum_required(VERSION 3.14)
set(PNGLIB_MAJOR 1)
set(PNGLIB_MINOR 6)
set(PNGLIB_REVISION 45)
#set(PNGLIB_SUBREVISION 0)
set(PNGLIB_SUBREVISION "git")
set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_REVISION})
set(PNGLIB_ABI_VERSION ${PNGLIB_MAJOR}${PNGLIB_MINOR})
set(PNGLIB_SHARED_VERSION ${PNGLIB_ABI_VERSION}.${PNGLIB_REVISION}.${PNGLIB_SUBREVISION})
project(libpng
VERSION ${PNGLIB_VERSION}
LANGUAGES C ASM)
include(CheckCSourceCompiles)
include(GNUInstallDirs)
# Allow the users to specify an application-specific API prefix for libpng
# vendoring purposes. A standard libpng build should have no such prefix.
set(PNG_PREFIX ""
CACHE STRING "Prefix to prepend to the API function names")
# Allow the users to override the postfix appended to debug library file names.
# Previously, we used to set CMAKE_DEBUG_POSTFIX globally. That variable should
# not be cached, however, because doing so would affect all projects processed
# after libpng, in unexpected and undesirable ways.
set(PNG_DEBUG_POSTFIX "d"
CACHE STRING "Postfix to append to library file names under the Debug configuration")
# Allow the users to import their own extra configuration settings.
set(DFA_XTRA ""
CACHE FILEPATH "File containing extra configuration settings")
# Allow the users to switch on/off various library build types.
option(PNG_SHARED "Build libpng as a shared library" ON)
option(PNG_STATIC "Build libpng as a static library" ON)
if(APPLE)
option(PNG_FRAMEWORK "Build libpng as a framework bundle" ON)
endif()
# Allow the users to switch on/off the auxiliary build and test artifacts.
# These artifacts are NOT part of libpng proper, and are subject to change
# at any time.
option(PNG_TESTS "Build the libpng tests" ON)
# Same as above, but for the third-party tools.
# Although these tools are targetted at development environments only,
# the users are allowed to override the option to build by default.
if(ANDROID OR IOS)
option(PNG_TOOLS "Build the libpng tools" OFF)
else()
option(PNG_TOOLS "Build the libpng tools" ON)
endif()
# Maintain backwards compatibility with the deprecated option PNG_EXECUTABLES.
option(PNG_EXECUTABLES "[Deprecated; please use PNG_TOOLS]" ON)
if(NOT PNG_EXECUTABLES)
message(DEPRECATION "The option PNG_EXECUTABLES has been deprecated in favour of PNG_TOOLS")
if(PNG_TOOLS)
message(AUTHOR_WARNING
"Setting PNG_TOOLS to ${PNG_EXECUTABLES}, to stay compatible with PNG_EXECUTABLES")
set(PNG_TOOLS "${PNG_EXECUTABLES}")
endif()
endif()
# Allow the users to configure various compilation options.
option(PNG_DEBUG "Enable debug output" OFF)
option(PNG_HARDWARE_OPTIMIZATIONS "Enable hardware optimizations" ON)
# Initialize and show the target architecture variable PNG_TARGET_ARCHITECTURE.
#
# NOTE:
# On macOS, CMake sets CMAKE_SYSTEM_PROCESSOR to either "x86_64" or "arm64",
# 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)
string(TOLOWER "${CMAKE_OSX_ARCHITECTURES}" PNG_TARGET_ARCHITECTURE)
else()
string(TOLOWER "${CMAKE_SYSTEM_PROCESSOR}" PNG_TARGET_ARCHITECTURE)
endif()
message(STATUS "Building for target architecture: ${PNG_TARGET_ARCHITECTURE}")
# Allow the users to specify a custom location of zlib.
# With CMake 3.12 and newer, this option is no longer necessary.
option(PNG_BUILD_ZLIB "[Deprecated; please use ZLIB_ROOT]" OFF)
if(PNG_BUILD_ZLIB)
if("x${ZLIB_ROOT}" STREQUAL "x")
message(SEND_ERROR
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} is no longer supported; "
"please use ZLIB_ROOT instead")
else()
message(SEND_ERROR
"The option PNG_BUILD_ZLIB=${PNG_BUILD_ZLIB} is no longer supported; "
"using ZLIB_ROOT=\"${ZLIB_ROOT}\"")
endif()
endif()
find_package(ZLIB REQUIRED)
if(UNIX
AND NOT (APPLE OR BEOS OR HAIKU)
AND NOT EMSCRIPTEN)
find_library(M_LIBRARY m)
if(M_LIBRARY)
set(M_LIBRARY m)
else()
set(M_LIBRARY "")
endif()
else()
# libm is not available or not needed.
endif()
if(PNG_HARDWARE_OPTIMIZATIONS)
# Set definitions and sources for ARM.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(arm|aarch)")
if(PNG_TARGET_ARCHITECTURE MATCHES "^(arm64|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 "off"
CACHE STRING "Enable ARM NEON optimizations: check|on|off; off 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_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(PNG_TARGET_ARCHITECTURE MATCHES "^(powerpc|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(PNG_TARGET_ARCHITECTURE MATCHES "^(i[3-6]86|x86|amd64)")
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(PNG_TARGET_ARCHITECTURE MATCHES "^(mipsel|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 ${PNG_MIPS_MSA} index_msa)
if(index_msa EQUAL -1)
message(FATAL_ERROR "PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
endif()
set(PNG_MIPS_MMI_POSSIBLE_VALUES on off)
set(PNG_MIPS_MMI "on"
CACHE STRING "Enable MIPS_MMI optimizations: on|off; on is default")
set_property(CACHE PNG_MIPS_MMI
PROPERTY STRINGS ${PNG_MIPS_MMI_POSSIBLE_VALUES})
list(FIND PNG_MIPS_MMI_POSSIBLE_VALUES ${PNG_MIPS_MMI} index_mmi)
if(index_mmi EQUAL -1)
message(FATAL_ERROR "PNG_MIPS_MMI must be one of [${PNG_MIPS_MMI_POSSIBLE_VALUES}]")
endif()
if(PNG_MIPS_MSA STREQUAL "on" AND PNG_MIPS_MMI STREQUAL "on")
set(libpng_mips_sources
mips/mips_init.c
mips/filter_msa_intrinsics.c
mips/filter_mmi_inline_assembly.c)
add_definitions(-DPNG_MIPS_MSA_OPT=2)
add_definitions(-DPNG_MIPS_MMI_OPT=1)
elseif(PNG_MIPS_MSA STREQUAL "on")
set(libpng_mips_sources
mips/mips_init.c
mips/filter_msa_intrinsics.c)
add_definitions(-DPNG_MIPS_MSA_OPT=2)
add_definitions(-DPNG_MIPS_MMI_OPT=0)
elseif(PNG_MIPS_MMI STREQUAL "on")
set(libpng_mips_sources
mips/mips_init.c
mips/filter_mmi_inline_assembly.c)
add_definitions(-DPNG_MIPS_MSA_OPT=0)
add_definitions(-DPNG_MIPS_MMI_OPT=1)
else()
add_definitions(-DPNG_MIPS_MSA_OPT=0)
add_definitions(-DPNG_MIPS_MMI_OPT=0)
endif()
endif()
# Set definitions and sources for LoongArch.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(loongarch)")
include(CheckCCompilerFlag)
set(PNG_LOONGARCH_LSX_POSSIBLE_VALUES on off)
set(PNG_LOONGARCH_LSX "on"
CACHE STRING "Enable LOONGARCH_LSX optimizations: on|off; on is default")
set_property(CACHE PNG_LOONGARCH_LSX
PROPERTY STRINGS ${PNG_LOONGARCH_LSX_POSSIBLE_VALUES})
list(FIND PNG_LOONGARCH_LSX_POSSIBLE_VALUES ${PNG_LOONGARCH_LSX} index)
if(index EQUAL -1)
message(FATAL_ERROR "PNG_LOONGARCH_LSX must be one of [${PNG_LOONGARCH_LSX_POSSIBLE_VALUES}]")
elseif(NOT PNG_LOONGARCH_LSX STREQUAL "off")
CHECK_C_COMPILER_FLAG("-mlsx" COMPILER_SUPPORTS_LSX)
if(COMPILER_SUPPORTS_LSX)
set(libpng_loongarch_sources
loongarch/loongarch_lsx_init.c
loongarch/filter_lsx_intrinsics.c)
set_source_files_properties(${libpng_loongarch_sources}
PROPERTIES
COMPILE_FLAGS "-mlsx")
add_definitions(-DPNG_LOONGARCH_LSX_OPT=1)
else()
message(FATAL_ERROR "Compiler does not support -mlsx option")
endif()
else()
add_definitions(-DPNG_LOONGARCH_LSX_OPT=0)
endif()
endif()
else(PNG_HARDWARE_OPTIMIZATIONS)
# Set definitions and sources for ARM.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(arm|aarch)")
add_definitions(-DPNG_ARM_NEON_OPT=0)
endif()
# Set definitions and sources for PowerPC.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(powerpc|ppc64)")
add_definitions(-DPNG_POWERPC_VSX_OPT=0)
endif()
# Set definitions and sources for Intel.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(i[3-6]86|x86|amd64)")
add_definitions(-DPNG_INTEL_SSE_OPT=0)
endif()
# Set definitions and sources for MIPS.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(mipsel|mips64el)")
add_definitions(-DPNG_MIPS_MSA_OPT=0)
endif()
# Set definitions and sources for LoongArch.
if(PNG_TARGET_ARCHITECTURE MATCHES "^(loongarch)")
add_definitions(-DPNG_LOONGARCH_LSX_OPT=0)
endif()
endif(PNG_HARDWARE_OPTIMIZATIONS)
option(ld-version-script "Enable linker version script" ON)
if(ld-version-script AND NOT (ANDROID OR APPLE))
# Check if LD supports linker scripts.
file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map" "
VERS_1 { global: sym1; local: *; };
VERS_2 { global: sym2; main; } VERS_1;
")
set(_SAVED_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
if(NOT CMAKE_HOST_SOLARIS)
# Avoid using CMAKE_SHARED_LIBRARY_C_FLAGS in version script checks on
# Solaris, because of an incompatibility with the Solaris link editor.
list(APPEND CMAKE_REQUIRED_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
endif()
list(APPEND CMAKE_REQUIRED_FLAGS "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/conftest.map'")
check_c_source_compiles("
void sym1(void) {}
void sym2(void) {}
int main(void) { return 0; }
" HAVE_LD_VERSION_SCRIPT)
if(NOT HAVE_LD_VERSION_SCRIPT)
set(CMAKE_REQUIRED_FLAGS ${_SAVED_CMAKE_REQUIRED_FLAGS})
if(NOT CMAKE_HOST_SOLARIS)
# Again, avoid using CMAKE_SHARED_LIBRARY_C_FLAGS in version script
# checks on Solaris.
list(APPEND CMAKE_REQUIRED_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
endif()
list(APPEND CMAKE_REQUIRED_FLAGS "-Wl,-M -Wl,${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
check_c_source_compiles("
void sym1(void) {}
void sym2(void) {}
int main(void) { return 0; }
" HAVE_SOLARIS_LD_VERSION_SCRIPT)
endif()
set(CMAKE_REQUIRED_FLAGS ${_SAVED_CMAKE_REQUIRED_FLAGS})
file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/conftest.map")
endif()
# Find an AWK language processor.
# Start with specific AWK implementations like gawk and nawk, which are
# known to work with our scripts, then fall back to the system awk.
find_program(AWK NAMES gawk nawk awk)
if(AWK)
message(STATUS "Found AWK program: ${AWK}")
else()
message(STATUS "Could not find an AWK-compatible program")
endif()
if(NOT AWK OR (ANDROID OR IOS))
# No awk available to generate sources; use pre-built pnglibconf.h
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt
${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h)
add_custom_target(png_genfiles)
else()
# Copy the awk scripts, converting their line endings to Unix (LF)
configure_file(${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
${CMAKE_CURRENT_BINARY_DIR}/scripts/dfn.awk
@ONLY
NEWLINE_STYLE LF)
# Generate .chk from .out with awk:
# generate_chk(INPUT <file> OUTPUT <file> [DEPENDS <deps>...])
function(generate_chk)
set(options)
set(oneValueArgs INPUT OUTPUT)
set(multiValueArgs DEPENDS)
cmake_parse_arguments(_GC "${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/cmake/genchk.cmake"
DEPENDS "${_GC_INPUT}" ${_GC_DEPENDS}
WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
endfunction()
# Generate .out from .c with awk:
# generate_out(INPUT <file> OUTPUT <file> [DEPENDS <deps>...])
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/cmake/genout.cmake"
DEPENDS "${_GO_INPUT}" ${_GO_DEPENDS}
WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
endfunction()
# Generate specific source file with awk:
# generate_source(OUTPUT <file> [DEPENDS <deps>...])
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/cmake/gensrc.cmake"
DEPENDS ${_GSO_DEPENDS}
WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
endfunction()
# Copy file:
# generate_copy(INPUT <file> OUTPUT <file> [DEPENDS <deps>...])
function(generate_copy)
set(options)
set(oneValueArgs INPUT OUTPUT)
set(multiValueArgs DEPENDS)
cmake_parse_arguments(_GCO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
if(NOT _GCO_INPUT)
message(FATAL_ERROR "generate_copy: Missing INPUT argument")
endif()
if(NOT _GCO_OUTPUT)
message(FATAL_ERROR "generate_copy: Missing OUTPUT argument")
endif()
add_custom_command(OUTPUT "${_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(png_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 "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
add_custom_target(png_scripts_intprefix_out
DEPENDS "${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"
"${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.out" pnglibconf_out)
add_custom_target(png_scripts_prefix_out
DEPENDS "${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 "${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
add_custom_target(png_scripts_sym_out
DEPENDS "${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"
"${CMAKE_CURRENT_SOURCE_DIR}/scripts/pnglibconf.h.prebuilt")
add_custom_target(png_scripts_symbols_out
DEPENDS "${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"
"${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h" pnglibconf_h)
add_custom_target(png_scripts_vers_out
DEPENDS "${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 png_scripts_symbols_out
"${CMAKE_CURRENT_BINARY_DIR}/scripts/checksym.awk"
"${CMAKE_CURRENT_SOURCE_DIR}/scripts/symbols.def")
add_custom_target(png_scripts_symbols_chk
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk")
generate_copy(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out"
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym"
DEPENDS png_scripts_sym_out)
generate_copy(INPUT "${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out"
OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers"
DEPENDS png_scripts_vers_out)
add_custom_target(png_genvers
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.vers")
add_custom_target(png_gensym
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym")
add_custom_target(png_genprebuilt
COMMAND "${CMAKE_COMMAND}"
"-DOUTPUT=scripts/pnglibconf.h.prebuilt"
-P "${CMAKE_CURRENT_BINARY_DIR}/scripts/cmake/gensrc.cmake"
WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
# A single target handles generation of all generated files.
add_custom_target(png_genfiles
DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/libpng.sym" png_gensym
"${CMAKE_CURRENT_BINARY_DIR}/libpng.vers" png_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
"${CMAKE_CURRENT_BINARY_DIR}/scripts/intprefix.out" png_scripts_intprefix_out
"${CMAKE_CURRENT_BINARY_DIR}/scripts/pnglibconf.c" png_scripts_pnglibconf_c
"${CMAKE_CURRENT_BINARY_DIR}/scripts/prefix.out" png_scripts_prefix_out
"${CMAKE_CURRENT_BINARY_DIR}/scripts/sym.out" png_scripts_sym_out
"${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.chk" png_scripts_symbols_chk
"${CMAKE_CURRENT_BINARY_DIR}/scripts/symbols.out" png_scripts_symbols_out
"${CMAKE_CURRENT_BINARY_DIR}/scripts/vers.out" png_scripts_vers_out)
endif(NOT AWK OR (ANDROID OR IOS))
# List the source code files.
set(libpng_public_hdrs
png.h
pngconf.h
"${CMAKE_CURRENT_BINARY_DIR}/pnglibconf.h"
)
set(libpng_private_hdrs
pngpriv.h
pngdebug.h
pnginfo.h
pngstruct.h
)
if(AWK AND NOT (ANDROID OR 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}
${libpng_loongarch_sources}
)
set(pngtest_sources
pngtest.c
)
set(pngvalid_sources
contrib/libtests/pngvalid.c
)
set(pngstest_sources
contrib/libtests/pngstest.c
)
set(pngunknown_sources
contrib/libtests/pngunknown.c
)
set(pngimage_sources
contrib/libtests/pngimage.c
)
set(pngfix_sources
contrib/tools/pngfix.c
)
set(png_fix_itxt_sources
contrib/tools/png-fix-itxt.c
)
if(MSVC OR (WIN32 AND (CMAKE_C_COMPILER_ID MATCHES "Clang")))
add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
endif()
if(PNG_DEBUG)
add_definitions(-DPNG_DEBUG)
endif()
# Now build our targets.
# Initialize the list of libpng library targets.
set(PNG_LIBRARY_TARGETS "")
# Initialize the libpng library file names.
if(UNIX
OR (WIN32 AND NOT CMAKE_SHARED_LIBRARY_PREFIX STREQUAL "")
OR (WIN32 AND NOT CMAKE_STATIC_LIBRARY_PREFIX STREQUAL ""))
# We are on a Unix or Unix-like toolchain like the GNU toolchain on Windows.
# Library file names are expected to have an implicit prefix such as "lib".
# Let CMake prepend and append its usual prefixes and suffixes by default.
set(PNG_SHARED_OUTPUT_NAME "png${PNGLIB_ABI_VERSION}")
set(PNG_STATIC_OUTPUT_NAME "png${PNGLIB_ABI_VERSION}")
else()
# We are, most likely, on a Windows toolchain like MSVC, Clang on Windows,
# Borland/Embarcadero, etc. We need to specify the "libpng" name explicitly.
# We also need to use a custom suffix, in order to distinguish between the
# shared import library name and the static library name.
set(PNG_SHARED_OUTPUT_NAME "libpng${PNGLIB_ABI_VERSION}")
set(PNG_STATIC_OUTPUT_NAME "libpng${PNGLIB_ABI_VERSION}_static")
endif()
if(PNG_SHARED)
add_library(png_shared SHARED ${libpng_sources})
add_dependencies(png_shared png_genfiles)
list(APPEND PNG_LIBRARY_TARGETS png_shared)
set_target_properties(png_shared PROPERTIES
OUTPUT_NAME "${PNG_SHARED_OUTPUT_NAME}"
DEBUG_POSTFIX "${PNG_DEBUG_POSTFIX}"
VERSION "${PNGLIB_SHARED_VERSION}"
SOVERSION "${PNGLIB_ABI_VERSION}")
if(UNIX AND AWK)
if(HAVE_LD_VERSION_SCRIPT)
set_target_properties(png_shared PROPERTIES
LINK_FLAGS "-Wl,--version-script='${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
elseif(HAVE_SOLARIS_LD_VERSION_SCRIPT)
set_target_properties(png_shared PROPERTIES
LINK_FLAGS "-Wl,-M -Wl,'${CMAKE_CURRENT_BINARY_DIR}/libpng.vers'")
endif()
endif()
if(APPLE)
# Avoid CMake's implicit compile definition "png_shared_EXPORTS".
set_target_properties(png_shared PROPERTIES DEFINE_SYMBOL "")
elseif(WIN32)
# Use the explicit compile definition "PNG_BUILD_DLL" for Windows DLLs.
set_target_properties(png_shared PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)
endif()
target_include_directories(png_shared
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
target_include_directories(png_shared
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>)
target_include_directories(png_shared SYSTEM
INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>)
target_link_libraries(png_shared PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(PNG_STATIC)
add_library(png_static STATIC ${libpng_sources})
add_dependencies(png_static png_genfiles)
list(APPEND PNG_LIBRARY_TARGETS png_static)
set_target_properties(png_static PROPERTIES
OUTPUT_NAME "${PNG_STATIC_OUTPUT_NAME}"
DEBUG_POSTFIX "${PNG_DEBUG_POSTFIX}")
target_include_directories(png_static
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
target_include_directories(png_static
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>)
target_include_directories(png_static SYSTEM
INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>)
target_link_libraries(png_static PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(PNG_FRAMEWORK AND NOT APPLE)
message(AUTHOR_WARNING
"Setting PNG_FRAMEWORK to OFF, as it only applies to Apple systems")
set(PNG_FRAMEWORK OFF)
endif()
if(PNG_FRAMEWORK)
add_library(png_framework SHARED ${libpng_sources})
add_dependencies(png_framework png_genfiles)
list(APPEND PNG_LIBRARY_TARGETS png_framework)
set_target_properties(png_framework PROPERTIES
FRAMEWORK TRUE
FRAMEWORK_VERSION "${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"
DEBUG_POSTFIX "${PNG_DEBUG_POSTFIX}")
# Avoid CMake's implicit compile definition "-Dpng_framework_EXPORTS".
set_target_properties(png_framework PROPERTIES DEFINE_SYMBOL "")
target_include_directories(png_framework
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
target_include_directories(png_framework
PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>)
target_include_directories(png_framework SYSTEM
INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>)
target_link_libraries(png_framework PUBLIC ZLIB::ZLIB ${M_LIBRARY})
endif()
if(NOT PNG_LIBRARY_TARGETS)
message(SEND_ERROR "No library variant selected to build. "
"Please enable at least one of the following options: "
"PNG_SHARED, PNG_STATIC, PNG_FRAMEWORK")
endif()
if(PNG_TESTS AND PNG_SHARED)
enable_testing()
# Add a custom target to run a test:
# png_add_test(NAME <test> COMMAND <command> [OPTIONS <options>...] [FILES <files>...])
function(png_add_test)
set(options)
set(oneValueArgs NAME COMMAND)
set(multiValueArgs OPTIONS FILES)
cmake_parse_arguments(_PAT "${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/cmake/test.cmake.in"
"${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake"
@ONLY)
add_test(NAME "${_PAT_NAME}"
COMMAND "${CMAKE_COMMAND}"
"-DLIBPNG=$<TARGET_FILE:png_shared>"
"-DTEST_COMMAND=$<TARGET_FILE:${_PAT_COMMAND}>"
-P "${CMAKE_CURRENT_BINARY_DIR}/tests/${_PAT_NAME}.cmake")
endfunction()
# Find test PNG files by globbing, but sort lists to ensure
# consistency between different filesystems.
file(GLOB PNGSUITE_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/pngsuite/*.png")
list(SORT PNGSUITE_PNGS)
file(GLOB TEST_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/*.png")
list(SORT TEST_PNGS)
file(GLOB TEST_PNG3_PNGS "${CMAKE_CURRENT_SOURCE_DIR}/contrib/testpngs/png-3/*.png")
list(SORT TEST_PNG3_PNGS)
set(PNGTEST_PNG "${CMAKE_CURRENT_SOURCE_DIR}/pngtest.png")
add_executable(pngtest ${pngtest_sources})
target_link_libraries(pngtest PRIVATE png_shared)
png_add_test(NAME pngtest
COMMAND pngtest
FILES "${PNGTEST_PNG}")
png_add_test(NAME pngtest-png-3
COMMAND pngtest
FILES "${TEST_PNG3_PNGS}")
add_executable(pngvalid ${pngvalid_sources})
target_link_libraries(pngvalid PRIVATE png_shared)
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 PRIVATE png_shared)
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 ${pngunknown_sources})
target_link_libraries(pngunknown PRIVATE png_shared)
png_add_test(NAME pngunknown-discard
COMMAND pngunknown
OPTIONS --strict default=discard
FILES "${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 PRIVATE png_shared)
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_TOOLS)
add_executable(pngfix ${pngfix_sources})
target_link_libraries(pngfix PRIVATE png_shared)
set(PNG_BIN_TARGETS pngfix)
add_executable(png-fix-itxt ${png_fix_itxt_sources})
target_link_libraries(png-fix-itxt PRIVATE ZLIB::ZLIB ${M_LIBRARY})
list(APPEND PNG_BIN_TARGETS png-fix-itxt)
endif()
# Create a symlink that points to a target file (if symlinking is possible),
# or make a copy of the target file (if symlinking is not possible):
# create_symlink(<destfile> [FILE <file> | TARGET <target>])
function(create_symlink DEST_FILE)
cmake_parse_arguments(_SYM "" "FILE;TARGET" "" ${ARGN})
if(NOT _SYM_FILE AND NOT _SYM_TARGET)
message(FATAL_ERROR "create_symlink: Missing FILE or TARGET argument")
endif()
if(_SYM_FILE AND _SYM_TARGET)
message(FATAL_ERROR "create_symlink: "
"The arguments FILE (${_SYM_FILE}) and TARGET (${_SYM_TARGET}) "
"are mutually-exclusive")
endif()
if(_SYM_FILE)
# If we don't need to symlink something that's coming from a build target,
# we can go ahead and symlink/copy at configure time.
if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
execute_process(COMMAND "${CMAKE_COMMAND}"
-E copy_if_different
${_SYM_FILE} ${DEST_FILE}
WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")