#========================================================================
#
# xpdf/cmake-xpdf.txt
#
# CMake script for the Xpdf tools.
#
# Copyright 2015 Glyph & Cog, LLC
#
#========================================================================

#========================================================================
# This is a customised version of Xpdf Tools' CMake file.
# Customised for Greenstone.
#========================================================================

include_directories("${PROJECT_SOURCE_DIR}")
include_directories("${PROJECT_BINARY_DIR}")
include_directories("${PROJECT_SOURCE_DIR}/goo")
include_directories("${PROJECT_SOURCE_DIR}/fofi")
include_directories("${PROJECT_SOURCE_DIR}/splash")

if(GSDLFLAG_STATIC_BUILD)
  message(STATUS "@@@@ GSDLFLAG_STATIC_BUILD SET. Building xpdf-tools statically.")
else ()
  message(STATUS "@@@@ GSDLFLAG_STATIC_BUILD not SET. Building dynamically using xpdf-tools' (mostly) original, unmodified linker flags.")
endif ()
if (PNG_FOUND)
  include_directories("${PNG_INCLUDE_DIRS}")
  add_definitions("${PNG_DEFINITIONS}")
else ()
  message(STATUS "@@@@@@@@@@@@@@@ NO PNG_FOUND")
endif ()
# https://stackoverflow.com/questions/36126333/mingw-cmake-undefined-reference-to-zlib
if (ZLIB_FOUND)
  include_directories("${ZLIB_INCLUDE_DIRS}")
  add_definitions("${ZLIB_DEFINITIONS}")
else ()
  message(STATUS "@@@@@@@@@@@@@@@ NO ZLIB_FOUND")
endif ()
if (HAVE_LCMS)
  include_directories("${LCMS_INCLUDE_DIR}")
  set(COLOR_MANAGER_SOURCE "ColorManager.cc")
  if(GSDLFLAG_STATIC_BUILD)
    # Untested combination, warn https://cmake.org/cmake/help/v3.0/command/message.html
    message(AUTHOR_WARNING "@@@@@@@@@@@@@@@ GSDL Warning: static building with HAVE_LCMS on. If running ldd/file on generated binaries shows any binary to be partially a dynamic executable, then Export VERBOSE=1 and re-run the CMake build. Then check the verbose build output's linker flags (for static building) for that binary: they should not be -Wl,-Bstatic LIBS -Wl,-Bdynamic -lpthread but -static LIBS. Fix it by removing all references to LCMS_LIBRARY in the static linking flags of target_link_libraries statements (i.e. when GSDLFLAG_STATIC_BUILD is set) in file gs-CMakeLists.txt and replacing them with the -l equivalent for the color manager library, (l)cms. @@@@@@@@@@@@@@@")
  endif ()
else ()
  set(COLOR_MANAGER_SOURCE "")
endif ()
if (TYPE_LIBRARY)
  if(GSDLFLAG_STATIC_BUILD)
    # Untested combination, warn
    message(AUTHOR_WARNING "@@@@@@@@@@@@@@@ GSDL Warning: static building with TYPE_LIBRARY. If running ldd/file on generated binaries shows any binary to be partially a dynamic executable, then export VERBOSE=1 and re-run the CMake build. Then check the verbose build output's linker flags (for static building) for that binary: they should not be -Wl,-Bstatic LIBS -Wl,-Bdynamic -lpthread but -static LIBS. Fix it by removing all references to DTYPE_LIBRARY in the static linking flags of target_link_libraries statements (i.e. when GSDLFLAG_STATIC_BUILD is set) in file gs-CMakeLists.txt and replacing them with the -l equivalent for typelib. @@@@@@@@@@@@@@@")
  endif ()
endif ()
add_library(xpdf_objs OBJECT
  AcroForm.cc
  Annot.cc
  Array.cc
  BuiltinFont.cc
  BuiltinFontTables.cc
  Catalog.cc
  CharCodeToUnicode.cc
  CMap.cc
  ${COLOR_MANAGER_SOURCE}
  Decrypt.cc
  Dict.cc
  Error.cc
  FontEncodingTables.cc
  Form.cc
  Function.cc
  Gfx.cc
  GfxFont.cc
  GfxState.cc
  GlobalParams.cc
  JArithmeticDecoder.cc
  JBIG2Stream.cc
  JPXStream.cc
  Lexer.cc
  Link.cc
  NameToCharCode.cc
  Object.cc
  OptionalContent.cc
  Outline.cc
  OutputDev.cc
  Page.cc
  Parser.cc
  PDFDoc.cc
  PDFDocEncoding.cc
  PSTokenizer.cc
  SecurityHandler.cc
  Stream.cc
  TextString.cc
  UnicodeMap.cc
  UnicodeTypeTable.cc
  UTF8.cc
  XFAForm.cc
  XRef.cc
  Zoox.cc
)

#--- object files needed by XpdfWidget

if ((QT4_FOUND OR Qt5Widgets_FOUND)
    AND HAVE_SPLASH AND MULTITHREADED AND USE_EXCEPTIONS)

  if (HIGHLIGHTED_REGIONS)
    set(HIGHLIGHT_SRC "HighlightFile.cc")
  else ()
    set(HIGHLIGHT_SRC "")
  endif ()

  add_library(xpdf_widget_objs OBJECT
    DisplayState.cc
    PDFCore.cc
    PreScanOutputDev.cc
    PSOutputDev.cc
    SplashOutputDev.cc
    TextOutputDev.cc
    TileCache.cc
    TileCompositor.cc
    TileMap.cc
    ${HIGHLIGHT_SRC}
  )
endif ()

# We want to build static xpdf-tools binaries. See
# https://stackoverflow.com/questions/24648357/compiling-a-static-executable-with-cmake
# Want to make the min number of changes for building statically, so using the way
# below. Beware, must *append* "-static" to existing CMAKE_EXE_LINKER_FLAGS=LD_FLAGS
##SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
##SET(BUILD_SHARED_LIBS OFF)
##SET(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -static")

# The original, unmodified CMakeLists.txt was not set up sufficiently
# for static compilation of xpdf-tools. As a result, compile would first fail
# with errors about undefined refs to mutex / lpthread.
# When building xpdf-tools statically, need to add the following 2 lines as well
# as append "Threads::Threads" to the end of each "target_link_libraries(<list>)"
# See https://stackoverflow.com/questions/1620918/cmake-and-libpthread
# found googling cmake and "-lpthread" (pthread) after ERRORS to do with this, like:
#   undefined reference to `pthread_mutex_unlock'
##set(THREADS_PREFER_PTHREAD_FLAG ON)
##find_package(Threads REQUIRED)

#--- pdftops

if (HAVE_SPLASH)
  add_executable(pdftops
    $<TARGET_OBJECTS:xpdf_objs>
    PreScanOutputDev.cc
    PSOutputDev.cc
    SplashOutputDev.cc
    pdftops.cc
  )  
  if(GSDLFLAG_STATIC_BUILD)
    target_link_libraries(pdftops goo fofi splash
      -static -lfreetype ${DTYPE_LIBRARY} ${LCMS_LIBRARY} -lz -lm -lc -lpthread)
    # Threads::Threads instead of -lpthread results in a partially dynamic executable
  else ()
    target_link_libraries(pdftops goo fofi splash
                        ${FREETYPE_LIBRARY} ${FREETYPE_OTHER_LIBS}
                        ${DTYPE_LIBRARY}
                        ${LCMS_LIBRARY}
			${ZLIB_LIBRARIES})
  endif ()
else ()
  add_executable(pdftops
    $<TARGET_OBJECTS:xpdf_objs>
    PreScanOutputDev.cc
    PSOutputDev.cc
    pdftops.cc
  )
  if(GSDLFLAG_STATIC_BUILD)
    target_link_libraries(pdftops goo fofi -static ${LCMS_LIBRARY} -lm -lc -lpthread)
  else ()
    target_link_libraries(pdftops goo fofi ${LCMS_LIBRARY})
  endif ()
endif ()
install(TARGETS pdftops RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdftops.1 DESTINATION man/man1)

#--- pdftotext

add_executable(pdftotext
  $<TARGET_OBJECTS:xpdf_objs>
  TextOutputDev.cc
  pdftotext.cc
)
if(GSDLFLAG_STATIC_BUILD)
  target_link_libraries(pdftotext goo fofi -static ${LCMS_LIBRARY} -lpthread)
  # Threads::Threads instead of -lpthread results in a partially dynamic executable
else ()
  target_link_libraries(pdftotext goo fofi ${LCMS_LIBRARY})
endif ()
install(TARGETS pdftotext RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdftotext.1 DESTINATION man/man1)

#--- pdftohtml

if (HAVE_SPLASH AND PNG_FOUND)
  add_executable(pdftohtml
    $<TARGET_OBJECTS:xpdf_objs>
    HTMLGen.cc
    SplashOutputDev.cc
    TextOutputDev.cc
    pdftohtml.cc
  )
  if(GSDLFLAG_STATIC_BUILD)
    target_link_libraries(pdftohtml goo fofi splash
      -static -lfreetype ${DTYPE_LIBRARY} ${LCMS_LIBRARY} -lpng -lz -lm -lc -lpthread)
  else ()
    target_link_libraries(pdftohtml goo fofi splash
                          ${FREETYPE_LIBRARY} ${FREETYPE_OTHER_LIBS}
                          ${DTYPE_LIBRARY}
                          ${LCMS_LIBRARY} ${PNG_LIBRARIES})
  endif ()
# Doing the regular target_link_libraries() in static mode results in building with 
# "-Wl,-Bstatic -lfreetype -lpng15 -lz -Wl,-Bdynamic -lpthread" at end of link line
# and produces broken binaries for pdftohtml/pdftoppm/pdftops/pdftopng.
# Note that PNG_LIBRARIES includes zlib/lz: "-lpng -lz", and along with freetype,
# these are linked statically. However, Threads/lpthread is included as a dynamically
# linked library instead of including a .a (regardless of whether it's appended
# as -lpthread or Threads::Threads in else above), contributing to the pdfhtml binary
# produced being a partially static, partially dynamic one,
# so a dynamic executable overall.
# The order of dynamic .so files listed by ldd in the broken binary differs from
# a manually linked working version of pdftohtml, and seems to be the only difference
# between the two in ldd output. Not using "-Wl,-Bstatic" and using -static in its
# place creates a partially static dynamic executable that isn't broken, whereas
# additionally removing "-Wl,-Bdynamic -lpthread" and replacing it with -lpthread
# moreover produces a working pdftohtml that is a fully static linked executable.
# The inclusion of the math lib and c lib (lm and lc) in the final link command
# are to completely bypass the remaining .so dependencies that were present in
# the executable and produce the fully static executable.
# Not sure what colormanager (lcms) and typelibrary, or how they're written in -l
# form as they were not present when the original unmodified static linking command
# was run, so they've not been included in the replacement static linking command. 
  install(TARGETS pdftohtml RUNTIME DESTINATION bin)
  install(FILES ${PROJECT_SOURCE_DIR}/doc/pdftohtml.1 DESTINATION man/man1)
endif ()

#--- pdfinfo

add_executable(pdfinfo
  $<TARGET_OBJECTS:xpdf_objs>
  pdfinfo.cc
)
if(GSDLFLAG_STATIC_BUILD)
  target_link_libraries(pdfinfo goo fofi -static ${LCMS_LIBRARY} -lpthread)
else ()
  target_link_libraries(pdfinfo goo fofi ${LCMS_LIBRARY})
endif()
install(TARGETS pdfinfo RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdfinfo.1 DESTINATION man/man1)

#--- pdffonts

add_executable(pdffonts
  $<TARGET_OBJECTS:xpdf_objs>
  pdffonts.cc
)
if(GSDLFLAG_STATIC_BUILD)
  target_link_libraries(pdffonts goo fofi -static ${LCMS_LIBRARY} -lpthread)
else ()
  target_link_libraries(pdffonts goo fofi ${LCMS_LIBRARY})
endif ()
install(TARGETS pdffonts RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdffonts.1 DESTINATION man/man1)

#--- pdfdetach

add_executable(pdfdetach
  $<TARGET_OBJECTS:xpdf_objs>
  pdfdetach.cc
)
if(GSDLFLAG_STATIC_BUILD)
  target_link_libraries(pdfdetach goo fofi -static ${LCMS_LIBRARY} -lpthread)
else ()
  target_link_libraries(pdfdetach goo fofi ${LCMS_LIBRARY})
endif ()
install(TARGETS pdfdetach RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdfdetach.1 DESTINATION man/man1)

#--- pdftoppm

if (HAVE_SPLASH)
  add_executable(pdftoppm
    $<TARGET_OBJECTS:xpdf_objs>
    SplashOutputDev.cc
    pdftoppm.cc
  )
  if(GSDLFLAG_STATIC_BUILD)
    target_link_libraries(pdftoppm goo fofi splash
      -static -lfreetype ${DTYPE_LIBRARY} ${LCMS_LIBRARY} -lz -lm -lc -lpthread)
  else ()
    target_link_libraries(pdftoppm goo fofi splash
                        ${FREETYPE_LIBRARY} ${FREETYPE_OTHER_LIBS}
                        ${DTYPE_LIBRARY}
                        ${LCMS_LIBRARY}
			${ZLIB_LIBRARIES})
  endif ()
  install(TARGETS pdftoppm RUNTIME DESTINATION bin)
  install(FILES ${PROJECT_SOURCE_DIR}/doc/pdftoppm.1 DESTINATION man/man1)
endif ()

#--- pdftopng

if (HAVE_SPLASH AND PNG_FOUND)
  add_executable(pdftopng
    $<TARGET_OBJECTS:xpdf_objs>
    SplashOutputDev.cc
    pdftopng.cc
  )
  if(GSDLFLAG_STATIC_BUILD)
    target_link_libraries(pdftopng goo fofi splash
      -static -lfreetype ${DTYPE_LIBRARY} ${LCMS_LIBRARY} -lpng -lz -lm -lc -lpthread)
  else ()
    target_link_libraries(pdftopng goo fofi splash
                        ${FREETYPE_LIBRARY} ${FREETYPE_OTHER_LIBS}
                        ${DTYPE_LIBRARY}
                        ${LCMS_LIBRARY} ${PNG_LIBRARIES})
  endif ()
  install(TARGETS pdftopng RUNTIME DESTINATION bin)
  install(FILES ${PROJECT_SOURCE_DIR}/doc/pdftopng.1 DESTINATION man/man1)
endif ()

#--- pdfimages

add_executable(pdfimages
  $<TARGET_OBJECTS:xpdf_objs>
  ImageOutputDev.cc
  pdfimages.cc
)
if(GSDLFLAG_STATIC_BUILD)
  target_link_libraries(pdfimages goo fofi -static ${LCMS_LIBRARY} -lpthread)
else ()
  target_link_libraries(pdfimages goo fofi ${LCMS_LIBRARY})
endif ()
install(TARGETS pdfimages RUNTIME DESTINATION bin)
install(FILES ${PROJECT_SOURCE_DIR}/doc/pdfimages.1 DESTINATION man/man1)

#--- xpdfrc man page

install(FILES ${PROJECT_SOURCE_DIR}/doc/xpdfrc.5 DESTINATION man/man5)