project(PNG C)

cmake_minimum_required(VERSION 2.4.3)

# Copyright (C) 2007 Glenn Randers-Pehrson

# This code is released under the libpng license.

# For conditions of distribution and use, see the disclaimer

# and license in png.h

set(PNGLIB_MAJOR 1)

set(PNGLIB_MINOR 2)

set(PNGLIB_RELEASE 40)

set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})

set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})

set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)

# needed packages

find_package(ZLIB REQUIRED)

include_directories(${ZLIB_INCLUDE_DIR})

if(NOT WIN32)

 find_library(M_LIBRARY

     NAMES m

     PATHS /usr/lib /usr/local/lib

 )

 if(NOT M_LIBRARY)

   message(STATUS

     "math library 'libm' not found - floating point support disabled")

 endif()

else()

 # not needed on windows

 set(M_LIBRARY "")

endif()

# COMMAND LINE OPTIONS

if(DEFINED PNG_SHARED)

  option(PNG_SHARED "Build shared lib" ${PNG_SHARED})

else()

  option(PNG_SHARED "Build shared lib" ON)

endif()

if(DEFINED PNG_STATIC)

  option(PNG_STATIC "Build static lib" ${PNG_STATIC})

else()

  option(PNG_STATIC "Build static lib" ON)

endif()

if(MINGW)

  option(PNG_TESTS  "Build pngtest" NO)

else(MINGW)

  option(PNG_TESTS  "Build pngtest" YES)

endif(MINGW)

option(PNG_NO_CONSOLE_IO "FIXME" YES)

option(PNG_NO_STDIO      "FIXME" YES)

option(PNG_DEBUG         "Build with debug output" NO)

option(PNGARG            "FIXME" YES)

#TODO:

# PNG_CONSOLE_IO_SUPPORTED

# maybe needs improving, but currently I don't know when we can enable what :)

set(png_asm_tmp "OFF")

if(NOT WIN32)

 find_program(uname_executable NAMES uname PATHS /bin /usr/bin /usr/local/bin)

 if(uname_executable)

   EXEC_PROGRAM(${uname_executable} ARGS --machine OUTPUT_VARIABLE uname_output)

   if("uname_output" MATCHES "^.*i[1-9]86.*$")

      set(png_asm_tmp "ON")

   else("uname_output" MATCHES "^.*i[1-9]86.*$")

      set(png_asm_tmp "OFF")

   endif("uname_output" MATCHES "^.*i[1-9]86.*$")

 endif(uname_executable)

else()

 # this env var is normally only set on win64

 SET(TEXT "ProgramFiles(x86)")

 if("$ENV{${TEXT}}" STREQUAL "")

  set(png_asm_tmp "ON")

 endif("$ENV{${TEXT}}" STREQUAL "")

endif()

# SET LIBNAME

set(PNG_LIB_NAME png${PNGLIB_MAJOR}${PNGLIB_MINOR})

# to distinguish between debug and release lib

set(CMAKE_DEBUG_POSTFIX "d")

# OUR SOURCES

set(libpng_sources

 png.h

 pngconf.h

 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

)

set(pngtest_sources

       pngtest.c

)

# SOME NEEDED DEFINITIONS

if(MSVC)

  add_definitions(-DPNG_NO_MODULEDEF -D_CRT_SECURE_NO_DEPRECATE)

endif(MSVC)

if(PNG_SHARED OR  NOT MSVC)

	#if building msvc static this has NOT do be defined

	add_definitions(-DZLIB_DLL)

endif()

add_definitions(-DLIBPNG_NO_MMX)

add_definitions(-DPNG_NO_MMX_CODE)

if(PNG_CONSOLE_IO_SUPPORTED)

 add_definitions(-DPNG_CONSOLE_IO_SUPPORTED)

endif()

if(PNG_NO_CONSOLE_IO)

 add_definitions(-DPNG_NO_CONSOLE_IO)

endif()

if(PNG_NO_STDIO)

 add_definitions(-DPNG_NO_STDIO)

endif()

if(PNG_DEBUG)

 add_definitions(-DPNG_DEBUG)

endif()

if(NOT M_LIBRARY AND NOT WIN32)

 add_definitions(-DPNG_NO_FLOATING_POINT_SUPPORTED)

endif()

# NOW BUILD OUR TARGET

include_directories(${PNG_SOURCE_DIR} ${ZLIB_INCLUDE_DIR})

if(PNG_SHARED)

 add_library(${PNG_LIB_NAME} SHARED ${libpng_sources})

 if(MSVC)

   # msvc does not append 'lib' - do it here to have consistent name

   set_target_properties(${PNG_LIB_NAME} PROPERTIES PREFIX "lib")

 endif()

 target_link_libraries(${PNG_LIB_NAME} ${ZLIB_LIBRARY} ${M_LIBRARY})

endif()

if(PNG_STATIC)

# does not work without changing name

 set(PNG_LIB_NAME_STATIC ${PNG_LIB_NAME}_static)

 add_library(${PNG_LIB_NAME_STATIC} STATIC ${libpng_sources})

 if(MSVC)

   # msvc does not append 'lib' - do it here to have consistent name

   set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES PREFIX "lib")

 endif()

endif()

if(PNG_SHARED AND WIN32)

 set_target_properties(${PNG_LIB_NAME} PROPERTIES DEFINE_SYMBOL PNG_BUILD_DLL)

endif()

if(PNG_TESTS AND PNG_SHARED)

# does not work with msvc due to png_lib_ver issue

 add_executable(pngtest ${pngtest_sources})

 target_link_libraries(pngtest ${PNG_LIB_NAME})

#  add_test(pngtest ${PNG_SOURCE_DIR}/pngtest.png)

endif()

# CREATE PKGCONFIG FILES

# we use the same files like ./configure, so we have to set its vars

set(prefix      ${CMAKE_INSTALL_PREFIX})

set(exec_prefix ${CMAKE_INSTALL_PREFIX})

set(libdir      ${CMAKE_INSTALL_PREFIX}/lib)

set(includedir  ${CMAKE_INSTALL_PREFIX}/include)

configure_file(${PNG_SOURCE_DIR}/scripts/libpng.pc.in

  ${PNG_BINARY_DIR}/libpng.pc)

configure_file(${PNG_SOURCE_DIR}/scripts/libpng-config.in

  ${PNG_BINARY_DIR}/libpng-config)

configure_file(${PNG_SOURCE_DIR}/scripts/libpng.pc.in

  ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc)

configure_file(${PNG_SOURCE_DIR}/scripts/libpng-config.in

  ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config)

# SET UP LINKS

if(PNG_SHARED)

  set_target_properties(${PNG_LIB_NAME} PROPERTIES

#    VERSION 0.${PNGLIB_RELEASE}.1.2.40

     VERSION 0.${PNGLIB_RELEASE}.0

     SOVERSION 0

     CLEAN_DIRECT_OUTPUT 1)

endif()

if(PNG_STATIC)

  if(NOT WIN32)

    # that's uncool on win32 - it overwrites our static import lib...

    set_target_properties(${PNG_LIB_NAME_STATIC} PROPERTIES

       OUTPUT_NAME ${PNG_LIB_NAME}

       CLEAN_DIRECT_OUTPUT 1)

  endif()

endif()

# INSTALL

if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )

    if(PNG_SHARED)

        install(TARGETS ${PNG_LIB_NAME}

            RUNTIME DESTINATION bin

            LIBRARY DESTINATION lib

            ARCHIVE DESTINATION lib)

    endif()

    if(PNG_STATIC)

        install(TARGETS ${PNG_LIB_NAME_STATIC}

            LIBRARY DESTINATION lib

            ARCHIVE DESTINATION lib)

    endif()

endif()

if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )

install(FILES png.h pngconf.h         DESTINATION include)

install(FILES png.h pngconf.h         DESTINATION include/${PNGLIB_NAME})

endif()

if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )

    install(FILES libpng.3 libpngpf.3             DESTINATION man/man3)

    install(FILES png.5                           DESTINATION man/man5)

    install(FILES ${PNG_BINARY_DIR}/libpng.pc     DESTINATION lib/pkgconfig)

    install(FILES ${PNG_BINARY_DIR}/libpng-config      DESTINATION bin)

    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}.pc  DESTINATION lib/pkgconfig)

    install(FILES ${PNG_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)

endif()

# what's with libpng.txt and all the extra files?

# UNINSTALL

# do we need this?

# DIST

# do we need this?

# to create msvc import lib for mingw compiled shared lib

# pexports libpng.dll > libpng.def

# lib /def:libpng.def /machine:x86