project('pango', 'c', 'cpp',
        version: '1.42.3',
        license: 'LGPLv2.1+',
        default_options: [
          'buildtype=debugoptimized',
          'warning_level=1',
          'c_std=c99',
        ],
        meson_version : '>= 0.43.0')

add_project_arguments([ '-D_POSIX_C_SOURCE=200809L', '-D_POSIX_THREAD_SAFE_FUNCTIONS', '-D_GNU_SOURCE', ], language: 'c')

pango_prefix = get_option('prefix')
pango_libdir = join_paths(pango_prefix, get_option('libdir'))
pango_sysconfdir = join_paths(pango_prefix, get_option('sysconfdir'))
pango_includedir = join_paths(pango_prefix, get_option('includedir'))
pango_datadir = join_paths(pango_prefix, get_option('datadir'))
pango_libexecdir = join_paths(pango_prefix, get_option('libexecdir'))

version = meson.project_version().split('.')
pango_major_version = version[0].to_int()
pango_minor_version = version[1].to_int()
pango_micro_version = version[2].to_int()

pango_interface_age = pango_minor_version.is_odd() ? 0 : pango_micro_version
pango_binary_age = pango_minor_version * 100 + pango_micro_version

pango_api_version = '@0@.0'.format(pango_major_version)
pango_api_path = 'pango-@0@/pango'.format(pango_api_version)

pango_conf = configuration_data()

pango_conf.set('PANGO_BINARY_AGE', pango_binary_age)
pango_conf.set('PANGO_INTERFACE_AGE', pango_interface_age)
pango_conf.set('PANGO_VERSION_MAJOR', pango_major_version)
pango_conf.set('PANGO_VERSION_MINOR', pango_minor_version)
pango_conf.set('PANGO_VERSION_MICRO', pango_micro_version)

# Maintain version scheme with libtool
pango_soversion = 0
pango_libversion = '@0@.@1@.@2@'.format(pango_soversion, (pango_binary_age - pango_interface_age), pango_interface_age)

cc = meson.get_compiler('c')
host_system = host_machine.system()

# Compiler and linker flags
common_cflags = []
common_cppflags = []
common_ldflags = []

# Add more compiler warnings to the default set
if cc.get_id() == 'msvc'
  # Compiler options taken from msvc_recommended_pragmas.h
  # in GLib, based on _Win32_Programming_ by Rector and Newcomer
  test_cflags = []
  add_project_arguments([ '-FImsvc_recommended_pragmas.h' ], language: 'c')
  test_c_only_flags = []
elif cc.get_id() == 'gcc' or cc.get_id() == 'clang'
  test_c_only_flags = [
    '-Wimplicit-function-declaration',
    '-Wstrict-prototypes',
    '-Wmissing-prototypes',
    '-Wnested-externs',
    '-Wold-style-definition',
    '-Wno-int-conversion',
    '-Wno-discarded-qualifiers',
  ]

  test_cflags = test_c_only_flags + [
    '-fno-strict-aliasing',
    '-Wpointer-arith',
    '-Wmissing-declarations',
    '-Wformat=2',
    '-Wformat-nonliteral',
    '-Wformat-security',
    '-Wunused',
    '-Wcast-align',
    '-Wmissing-noreturn',
    '-Wmissing-format-attribute',
    '-Wmissing-include-dirs',
    '-Wlogical-op',
    '-Wno-uninitialized',
    '-Wno-shadow',
    '-Werror=redundant-decls',
    '-Werror=implicit',
    '-Werror=nonnull',
    '-Werror=init-self',
    '-Werror=main',
    '-Werror=missing-braces',
    '-Werror=sequence-point',
    '-Werror=return-type',
    '-Werror=trigraphs',
    '-Werror=array-bounds',
    '-Werror=write-strings',
    '-Werror=address',
    '-Werror=int-to-pointer-cast',
    '-Werror=pointer-to-int-cast',
    '-Werror=empty-body',
    '-Werror=write-strings',
    '-Wundef', # FIXME: https://bugzilla.gnome.org/show_bug.cgi?id=792481
  ]

  if host_system == 'windows'
    test_cflags += [ '-mms-bitfields' ]
  endif
else
  test_cflags = []
  test_c_only_flags = []
endif

# Symbol visibility
if get_option('default_library') != 'static'
  if host_system == 'windows'
    pango_conf.set('DLL_EXPORT', true)
    pango_conf.set('_PANGO_EXTERN', '__declspec(dllexport) extern')
    if cc.get_id() != 'msvc'
      test_cflags += ['-fvisibility=hidden']
    endif
  else
    pango_conf.set('_PANGO_EXTERN', '__attribute__((visibility("default"))) extern')
    test_cflags += ['-fvisibility=hidden']
  endif
endif

# Check all compiler flags
foreach cflag: test_cflags
  if cc.has_argument(cflag)
    common_cflags += [ cflag ]
  endif
endforeach

# Isolate the C++ compiler flags
foreach cflag: common_cflags
  if not test_c_only_flags.contains(cflag)
    common_cppflags += [ cflag ]
  endif
endforeach

# Linker flags
if host_machine.system() == 'linux'
  foreach ldflag: [ '-Wl,-Bsymbolic', '-Wl,-z,relro', '-Wl,-z,now', ]
    if cc.has_argument(ldflag)
      common_ldflags += [ ldflag ]
    endif
  endforeach
endif

# Maintain compatibility with autotools on macOS
if host_machine.system() == 'darwin'
  common_ldflags += [ '-compatibility_version 1', '-current_version 1.0', ]
endif

# Functions
checked_funcs = [
  'sysconf',
  'getpagesize',
  'flockfile',
  'strtok_r',
]

foreach f: checked_funcs
  if cc.has_function(f)
    pango_conf.set('HAVE_' + f.underscorify().to_upper(), 1)
  endif
endforeach

# Headers
checked_headers = [
  'unistd.h',
  'sys/mman.h',
  'dirent.h',
]

foreach h: checked_headers
  if cc.has_header(h)
    pango_conf.set('HAVE_' + h.underscorify().to_upper(), 1)
  endif
endforeach

buildtype = get_option('buildtype')
if buildtype.startswith('debug')
  pango_debug_cflags = [ '-DPANGO_ENABLE_DEBUG', ]
elif buildtype == 'release'
  pango_debug_cflags = [ '-DG_DISABLE_CAST_CHECKS', ]
  # TODO: We may want a configuration argument to add `G_DISABLE_CHECKS`
  # and `G_DISABLE_ASSERT` from the build, for specific build environments.
  # On the other hand, those who need these symbols can inject them in their
  # build as well.
else
  pango_debug_cflags = []
endif

# Dependencies
pango_deps = []

glib_req_version = '>= 2.33.12'
fribidi_req_version = '>= 0.19.7'
libthai_req_version = '>= 0.1.9'
harfbuzz_req_version = '>= 1.4.2'
fontconfig_req_version = '>= 2.11.91'
xft_req_version = '>= 2.0.0'
cairo_req_version = '>= 1.12.10'

# libm
mathlib_dep = cc.find_library('m', required: false)
pango_deps += mathlib_dep

# gobject
gobject_dep = dependency('gobject-2.0', version: glib_req_version)
pango_deps += gobject_dep

fribidi_dep = dependency('fribidi', version: fribidi_req_version)
pango_deps += fribidi_dep

thai_dep = dependency('libthai', version: libthai_req_version, required: false)
if thai_dep.found()
  pango_conf.set('HAVE_LIBTHAI', 1)
  pango_deps += thai_dep

  if cc.has_function('th_brk_find_breaks', dependencies: thai_dep)
    pango_conf.set('HAVE_TH_BRK_FIND_BREAKS', 1)
  endif
endif

# These are for the various .pc files so that things will link
# properly, depending on whether we have the pkg-config files
# for those non-GNOME dependencies, or when we find them manually
# for MSVC builds, as their MSVC build systems do not generate
# pkg-config files for them
cairo_pc = ''
cairo_lib = ''
harfbuzz_pc=''
freetype2_pc=''
fontconfig_pc=''
harfbuzz_lib=''
freetype2_lib=''
fontconfig_lib=''

harfbuzz_dep = dependency('harfbuzz', version: harfbuzz_req_version, required: false)
if harfbuzz_dep.found()
  harfbuzz_pc = 'harfbuzz'
else
  if cc.get_id() == 'msvc' and cc.has_header('hb.h')
    # The CMake build files for HarfBuzz (which is used for MSVC builds) do not
    # generate pkg-config files, so look for harfbuzz.lib
    harfbuzz_dep = cc.find_library('harfbuzz', required: false)
    if harfbuzz_dep.found()
      harfbuzz_lib = '-lharfbuzz'
    endif
  endif
endif
if harfbuzz_dep.found()
  pango_deps += harfbuzz_dep
endif

fontconfig_dep = dependency('fontconfig', version: fontconfig_req_version, required: false)
if fontconfig_dep.found()
  fontconfig_pc = 'fontconfig'
else
  if cc.get_id() == 'msvc' and cc.has_header('fontconfig/fontconfig.h')
    # Look for the Visual Studio-style import library if FontConfig's .pc file cannot be
    # found on Visual Studio
    fontconfig_dep = cc.find_library('fontconfig', required: false)
    if fontconfig_dep.found()
      fontconfig_lib = '-lfontconfig'
    endif
  endif
endif

if fontconfig_dep.found()
  pango_deps += fontconfig_dep

  if cc.has_function('FcWeightFromOpenTypeDouble', dependencies: fontconfig_dep)
    pango_conf.set('HAVE_FCWEIGHTFROMOPENTYPEDOUBLE', 1)
  endif
endif

# The first version of freetype with a pkg-config file is 2.1.5
# We require both fontconfig and freetype if we are to have either.
freetype_dep = dependency('freetype2', required: false)

if freetype_dep.found()
  freetype2_pc = 'freetype2'
else
  if cc.get_id() == 'msvc' and cc.has_header('ft2build.h')
    foreach ft2_lib: ['freetype', 'freetypemt']
      if not freetype_dep.found()
        freetype_dep = cc.find_library(ft2_lib, required: false)
        if freetype_dep.found()
          freetype2_lib = '-l@0@'.format(ft2_lib)
        endif
      endif
    endforeach
  endif
endif

# To build pangoft2, we need HarfBuzz, FontConfig and FreeType
build_pangoft2 = harfbuzz_dep.found() and fontconfig_dep.found() and freetype_dep.found()
if build_pangoft2
  pango_conf.set('HAVE_FREETYPE', 1)
  pango_deps += freetype_dep
endif

xft_dep = dependency('xft', version: xft_req_version, required: false)
if xft_dep.found()
  pango_conf.set('HAVE_XFT', 1)
  pango_deps += dependency('xrender', required: false)
  pango_deps += xft_dep
endif

if host_system == 'darwin'
  has_core_text = cc.links('''#include <Carbon/Carbon.h>
                              int main (void) {
                                CTGetCoreTextVersion ();
                                return 0;
                              }''',
                           name: 'CoreText availability',
                           dependencies: dependency('appleframeworks', modules: 'ApplicationServices'))
  if has_core_text
    pango_conf.set('HAVE_CORE_TEXT', 1)
  endif
endif

cairo_pkgconfig_found = false
cairo_dep = dependency('cairo', version: cairo_req_version, required: false)

if cairo_dep.found()
  cairo_pkgconfig_found = true
else
  if cc.get_id() == 'msvc' and cc.has_header('cairo.h')
    cairo_dep = cc.find_library('cairo', required: false)
  endif
endif

pango_font_backends = []
pango_cairo_backends = []

if cairo_pkgconfig_found
  # Check the following Cairo font backends
  # - dependency
  # - version
  # - define
  # - backend name
  # Note that Cairo can be built with FreeType but without FontConfig

  cairo_font_backends = [
    [ 'cairo-ft', cairo_req_version, 'HAVE_CAIRO_FREETYPE', 'freetype', ],
    [ 'cairo-win32', cairo_req_version, 'HAVE_CAIRO_WIN32', 'win32', ],
    [ 'cairo-quartz', cairo_req_version, 'HAVE_CAIRO_QUARTZ', 'quartz', ],
  ]

  foreach b: cairo_font_backends
    dep = dependency(b[0], version: b[1], required: false)
    if dep.found()
      if b[0] == 'cairo-ft'
        if build_pangoft2
          pango_conf.set(b[2], 1)
          pango_font_backends += b[3]
        endif
      else
        pango_conf.set(b[2], 1)
        pango_font_backends += b[3]
      endif
    endif
  endforeach

  if pango_font_backends.length() == 0
    error('No Cairo font backends found')
  endif

  # Check the following Cairo surface backends
  # - dependency
  # - version
  # - define
  # - backend name
  cairo_surface_backends = [
    [ 'cairo-png', cairo_req_version, 'HAVE_CAIRO_PNG', 'png', ],
    [ 'cairo-ps', cairo_req_version, 'HAVE_CAIRO_PS', 'ps', ],
    [ 'cairo-pdf', cairo_req_version, 'HAVE_CAIRO_PDF', 'pdf', ],
    [ 'cairo-xlib', cairo_req_version, 'HAVE_CAIRO_XLIB', 'xlib', ],
  ]

  foreach b: cairo_surface_backends
    dep = dependency(b[0], version: b[1], required: false)
    if dep.found()
      pango_conf.set(b[2], 1)
      pango_cairo_backends += b[3]
    endif
  endforeach

  # This is to set up pangocairo.pc so that things that refer to
  # it will link correctly
  cairo_pc = 'cairo'
elif (cc.get_id() == 'msvc' and cairo_dep.found())
  # Fallback: Look for Cairo items manually
  # We need to check for headers for some
  cairo_headers = [ 'win32', 'quartz', 'ps', 'pdf', 'xlib' ]

  foreach header : cairo_headers
    if cc.has_header('cairo-@0@.h'.format(header))
      pango_conf.set('HAVE_CAIRO_@0@'.format(header.underscorify().to_upper()), 1)
      if header == 'win32' or header == 'quartz'
        pango_font_backends += header
      else
        pango_cairo_backends += header
      endif
    endif
  endforeach

  # Other cairo features that we need to check for symbols
  # Note that Cairo with FreeType support can be without FontConfig
  # support, so we must check for FontConfig support in Cairo
  if cc.links('''#include <cairo-ft.h>
                 int main() {
                   FcPattern *p = NULL;
                   cairo_ft_font_face_create_for_pattern (p);
                   return 0;
                 }''',
                 dependencies: cairo_dep,
                 name : 'Cairo is built with FreeType and FontConfig support')
    if build_pangoft2
      pango_conf.set('HAVE_CAIRO_FREETYPE', 1)
      pango_font_backends += 'freetype'
    endif
  endif

  if pango_font_backends.length() == 0
    error('No Cairo font backends found')
  endif

  # Check for Cairo's libpng output surface support
  if cc.links('''#include <cairo.h>
                 #include <stdio.h>
                 int main() {
                   cairo_surface_t *s = NULL;
                   const char *f = "abc.png";
                   cairo_surface_write_to_png (s, f);
                   return 0;
                 }''',
                 dependencies: cairo_dep,
                 name : 'Cairo is built with PNG output surface support')
    pango_conf.set('HAVE_CAIRO_PNG', 1)
    pango_cairo_backends += 'png'
  endif

  # This is to set up pangocairo.pc so that things that refer to
  # it will link correctly, when we don't have pkg-config files for cairo
  cairo_lib = '-lcairo'
endif

if cairo_dep.found()
  pango_conf.set('HAVE_CAIRO', 1)
  pango_deps += cairo_dep

  pangocairo_requires = ''

  if pango_font_backends.contains('freetype')
    pangocairo_requires += 'pangoft2 '
  endif

  if pango_font_backends.contains('win32')
    pangocairo_requires += 'pangowin32 '
  endif
endif

# Compat variables for pkgconfig
pkgconf = configuration_data()
pkgconf.set('prefix', pango_prefix)
pkgconf.set('exec_prefix', pango_prefix)
pkgconf.set('libdir', pango_libdir)
pkgconf.set('includedir', pango_includedir)
pkgconf.set('VERSION', meson.project_version())
pkgconf.set('PANGO_API_VERSION', pango_api_version)
pkgconf.set('PKGCONFIG_CAIRO_REQUIRES', pangocairo_requires)
pkgconf.set('CAIRO_PC', cairo_pc)
pkgconf.set('CAIRO_LIB', cairo_lib)
pkgconf.set('FREETYPE2_PC', freetype2_pc)
pkgconf.set('FREETYPE2_LIB', freetype2_lib)
pkgconf.set('FONTCONFIG_PC', fontconfig_pc)
pkgconf.set('FONTCONFIG_LIB', fontconfig_lib)
pkgconf.set('HARFBUZZ_PC', harfbuzz_pc)
pkgconf.set('HARFBUZZ_LIB', harfbuzz_lib)

pkgconf_files = [
  [ 'pango.pc' ],
  [ 'pangowin32.pc', host_system == 'windows' ],
  [ 'pangoft2.pc', build_pangoft2 ],
  [ 'pangoxft.pc', xft_dep.found() ],
  [ 'pangocairo.pc', cairo_dep.found() ],
]

foreach pkg: pkgconf_files
  pkg_name = pkg[0]
  pkg_enabled = pkg.get(1, true)

  if pkg_enabled
    configure_file(input: pkg_name + '.in',
                   output: pkg_name,
                   configuration: pkgconf,
                   install: true,
                   install_dir: join_paths(pango_libdir, 'pkgconfig'))
  endif
endforeach

gnome = import('gnome')

# Internal configuration header
configure_file(output: 'config.h', configuration: pango_conf)

root_inc = include_directories('.')

subdir('pango')
subdir('utils')
subdir('examples')
subdir('tests')
subdir('tools')

if get_option('enable_docs')
  subdir('docs')
endif