project('harfbuzz', 'c', 'cpp',
  meson_version: '>= 0.53.0',
  default_options : ['cpp_std=c++11'],
  version: '2.6.6')

warning('Meson is not our main build system yet, don\'t use it for packaging HarfBuzz for *nix distros for now')

hb_version_arr = meson.project_version().split('.')
hb_version_major = hb_version_arr[0].to_int()
hb_version_minor = hb_version_arr[1].to_int()
hb_version_micro = hb_version_arr[2].to_int()

# libtool versioning
hb_version_int = hb_version_major*10000 + hb_version_minor*100 + hb_version_micro
if hb_version_minor % 2 == 1
  hb_libtool_revision = 0                # for unstable releases
else
  hb_libtool_revision = hb_version_micro # for stable releases
endif
hb_libtool_age = hb_version_int - hb_libtool_revision
hb_libtool_current = hb_libtool_age
hb_libtool_version_info = '@0@:@1@:@2@'.format(hb_libtool_current, hb_libtool_revision, hb_libtool_age)

pkgmod = import('pkgconfig')
cpp = meson.get_compiler('cpp')

if cpp.get_id() == 'msvc'
  # Ignore several spurious warnings for things HarfBuzz does very commonly.
  # If a warning is completely useless and spammy, use '/wdXXXX' to suppress it
  # If a warning is harmless but hard to fix, use '/woXXXX' so it's shown once
  # NOTE: Only add warnings here if you are sure they're spurious
  msvc_args = [
      '/wd4018', # implicit signed/unsigned conversion
      '/wd4146', # unary minus on unsigned (beware INT_MIN)
      '/wd4244', # lossy type conversion (e.g. double -> int)
      '/wd4305', # truncating type conversion (e.g. double -> float)
      cpp.get_supported_arguments(['/utf-8']), # set the input encoding to utf-8
  ]
  add_project_arguments(msvc_args, language : ['c', 'cpp'])
  # Disable SAFESEH with MSVC for libs that use external deps that are built with MinGW
  # noseh_link_args = ['/SAFESEH:NO']
endif

add_project_arguments(cpp.get_supported_arguments([
  '-fno-rtti',
  '-fno-exceptions',
  '-fno-threadsafe-statics',
  '-fvisibility-inlines-hidden', # maybe shouldn't be applied for mingw
]), language : 'cpp')

if host_machine.cpu_family() == 'arm' and cpp.alignment('struct { char c; }') != 1
  if cpp.has_argument('-mstructure-size-boundary=8')
    add_project_arguments('-mstructure-size-boundary=8', language : 'cpp')
  endif
endif

python3 = import('python').find_installation('python3')

check_headers = [
  ['unistd.h'],
  ['sys/mman.h'],
  ['stdbool.h'],
]

check_funcs = [
  ['atexit'],
  ['mprotect'],
  ['sysconf'],
  ['getpagesize'],
  ['mmap'],
  ['isatty'],
  ['roundf'],
]

freetype_dep = dependency('freetype2', required: false)

if not freetype_dep.found() and cpp.get_id() == 'msvc'
  if cpp.has_header('ft2build.h')
    freetype_dep = cpp.find_library('freetype', required: false)
  endif
endif

if not freetype_dep.found() and get_option('freetype').enabled()
  freetype_dep = dependency('freetype2', fallback: ['freetype2', 'freetype_dep'])
endif

glib_dep = dependency('glib-2.0', required: get_option('glib'),
                      fallback: ['glib', 'libglib_dep'])
gobject_dep = dependency('gobject-2.0', required: get_option('gobject'),
                         fallback: ['glib', 'libgobject_dep'])
cairo_dep = dependency('cairo', required: false)
fontconfig_dep = dependency('fontconfig', required: get_option('fontconfig'),
                            fallback: ['fontconfig', 'fontconfig_dep'])
graphite2_dep = dependency('graphite2', required: get_option('graphite'))
icu_dep = dependency('icu-uc', required: false)
m_dep = cpp.find_library('m', required: false)

if not icu_dep.found() and get_option('icu').enabled()
  icu_dep = dependency('icu-uc', required: cpp.get_id() != 'msvc')
endif

if not icu_dep.found() and cpp.get_id() == 'msvc'
  if cpp.has_header('unicode/uchar.h') and \
     cpp.has_header('unicode/unorm2.h') and \
     cpp.has_header('unicode/ustring.h') and \
     cpp.has_header('unicode/utf16.h') and \
     cpp.has_header('unicode/uversion.h') and \
     cpp.has_header('unicode/uscript.h')
    if get_option('buildtype') == 'debug'
      icu_dep = cpp.find_library('icuucd', required: get_option('icu'))
    else
      icu_dep = cpp.find_library('icuuc', required: get_option('icu'))
    endif
  else
    if get_option('icu').enabled()
      error('ICU headers and libraries must be present to build ICU support')
    endif
  endif
endif

if not cairo_dep.found() and cpp.get_id() == 'msvc'
  if cpp.has_header('cairo.h')
    cairo_dep = cpp.find_library('cairo')
  endif
endif

if not cairo_dep.found() and get_option('cairo').enabled()
  cairo_dep = dependency('cairo', fallback: ['cairo', 'libcairo_dep'])
endif

# Ensure that cairo-ft is fetched from the same library as cairo itself
if cairo_dep.found()
  if cairo_dep.type_name() == 'pkgconfig'
    cairo_ft_dep = dependency('cairo-ft', required: get_option('cairo'))
  else
    if cpp.has_header('cairo-ft.h') and \
       cpp.has_function('cairo_ft_font_face_create_for_ft_face', dependencies: cairo_dep)
      cairo_ft_dep = cairo_dep
    endif
  endif
else
  # Not-found dependency
  cairo_ft_dep = dependency('', required: false)
endif

deps = []

conf = configuration_data()
incconfig = include_directories('.')

add_project_arguments('-DHAVE_CONFIG_H', language: ['c', 'cpp'])

warn_cflags = [
  '-Wno-non-virtual-dtor',
]

cpp_args = cpp.get_supported_arguments(warn_cflags)

if m_dep.found()
  deps += [m_dep]
endif

if glib_dep.found()
  conf.set('HAVE_GLIB', 1)
  deps += [glib_dep]
endif

if gobject_dep.found()
  conf.set('HAVE_GOBJECT', 1)
  deps += [gobject_dep]
endif

if cairo_dep.found()
  conf.set('HAVE_CAIRO', 1)
  deps += [cairo_dep]
endif

if cairo_ft_dep.found()
  conf.set('HAVE_CAIRO_FT', 1)
  deps += [cairo_ft_dep]
endif

if graphite2_dep.found()
  conf.set('HAVE_GRAPHITE2', 1)
  deps += [graphite2_dep]
endif

if icu_dep.found()
  conf.set('HAVE_ICU', 1)
endif

if get_option('icu-builtin')
  conf.set('HAVE_ICU_BUILTIN', 1)
endif

if get_option('experimental-api')
  conf.set('HB_EXPERIMENTAL_API', 1)
endif

if freetype_dep.found()
  conf.set('HAVE_FREETYPE', 1)
  deps += [freetype_dep]
  check_freetype_funcs = [
    ['FT_Get_Var_Blend_Coordinates', {'deps': freetype_dep}],
    ['FT_Set_Var_Blend_Coordinates', {'deps': freetype_dep}],
    ['FT_Done_MM_Var', {'deps': freetype_dep}],
  ]

  if freetype_dep.type_name() == 'internal'
    foreach func: check_freetype_funcs
      name = func[0]
      conf.set('HAVE_@0@'.format(name.to_upper()), 1)
    endforeach
  else
    check_funcs += check_freetype_funcs
  endif
endif

if fontconfig_dep.found()
  conf.set('HAVE_FONTCONFIG', 1)
  deps += [fontconfig_dep]
endif

# GDI (uniscribe) (windows)
if host_machine.system() == 'windows' and not get_option('gdi').disabled()
  # TODO: make nicer once we have https://github.com/mesonbuild/meson/issues/3940
  if cpp.has_header('usp10.h') and cpp.has_header('windows.h')
    foreach usplib : ['usp10', 'gdi32', 'rpcrt4']
      deps += [cpp.find_library(usplib, required: true)]
    endforeach
    conf.set('HAVE_UNISCRIBE', 1)
    conf.set('HAVE_GDI', 1)
  elif get_option('gdi').enabled()
    error('gdi was enabled explicitly, but some required headers are missing.')
  endif
endif

# DirectWrite (windows)
if host_machine.system() == 'windows' and not get_option('directwrite').disabled()
  if cpp.has_header('dwrite_1.h')
    deps += [cpp.find_library('dwrite', required: true)]
    conf.set('HAVE_DIRECTWRITE', 1)
  elif get_option('directwrite').enabled()
    error('DirectWrite was enabled explicitly, but required header is missing.')
  endif
endif

# CoreText (macOS) - FIXME: untested
if host_machine.system() == 'darwin' and not get_option('coretext').disabled()
  app_services_dep = dependency('appleframeworks', modules : ['ApplicationServices'], required: false)
  if cpp.has_type('CTFontRef', prefix: '#include <ApplicationServices/ApplicationServices.h>', dependencies: app_services_dep)
    deps += [app_services_dep]
    conf.set('HAVE_CORETEXT', 1)
  # On iOS CoreText and CoreGraphics are stand-alone frameworks
  # Check for a different symbol to avoid getting cached result
  else
    coretext_dep = dependency('appleframeworks', modules : ['CoreText'], required: false)
    coregraphics_dep = dependency('appleframeworks', modules : ['CoreGraphics'], required: false)
    corefoundation_dep = dependency('appleframeworks', modules : ['CoreFoundation'], required: false)
    if cpp.has_type('CTRunRef', prefix: '#include <CoreText/CoreText.h>', dependencies: [coretext_dep, coregraphics_dep, corefoundation_dep])
      deps += [coretext_dep, coregraphics_dep, corefoundation_dep]
      conf.set('HAVE_CORETEXT', 1)
    elif get_option('coretext').enabled()
      error('CoreText was enabled explicitly, but required headers or frameworks are missing.')
    endif
  endif
endif

# threads
if host_machine.system() != 'windows'
  thread_dep = dependency('threads', required: false)

  if thread_dep.found()
    conf.set('HAVE_PTHREAD', 1)
    deps += [thread_dep]
  else
    check_headers += ['sched.h']
    check_funcs += ['sched_yield', {'link_with': 'rt'}]
  endif
endif

conf.set('HAVE_OT', 1)
conf.set('HAVE_FALLBACK', 1)
conf.set_quoted('PACKAGE_NAME', 'HarfBuzz')
conf.set_quoted('PACKAGE_VERSION', meson.project_version())

foreach check : check_headers
  name = check[0]

  if cpp.has_header(name)
    conf.set('HAVE_@0@'.format(name.to_upper().underscorify()), 1)
  endif
endforeach

foreach check : check_funcs
  name = check[0]
  opts = check.get(1, {})
  link_withs = opts.get('link_with', [])
  check_deps = opts.get('deps', [])
  extra_deps = []
  found = true

  # First try without linking

  found = cpp.has_function(name, dependencies: check_deps)

  if not found and link_withs.length() > 0
    found = true

    foreach link_with : link_withs
      dep = cpp.find_library(link_with, required: false)
      if dep.found()
        extra_deps += dep
      else
        found = false
      endif
    endforeach

    if found
      found = cpp.has_function(name, dependencies: check_deps + extra_deps)
    endif
  endif

  if found
    deps += extra_deps
    conf.set('HAVE_@0@'.format(name.to_upper()), 1)
  endif
endforeach

if cpp.links(files('meson-cc-tests/intel-atomic-primitives-test.c'), name: 'Intel atomics')
  conf.set('HAVE_INTEL_ATOMIC_PRIMITIVES', 1)
endif

if cpp.links(files('meson-cc-tests/solaris-atomic-operations.c'), name: 'Solaris atomic ops')
  conf.set('HAVE_SOLARIS_ATOMIC_OPS', 1)
endif

subdir('src')
subdir('util')

if not get_option('tests').disabled()
  subdir('test')
endif

if not get_option('gtk_doc').disabled()
  subdir('docs')
endif

configure_file(output: 'config.h', configuration: conf)