project('gtk+-4.0', 'c',
        version: '3.91.2',
        default_options: [
          'buildtype=debugoptimized',
          'warning_level=1',
          'c_std=c99',
        ],
        meson_version : '>= 0.40.0',
        license: 'LGPLv2.1+')

glib_major_req = 2
glib_minor_req = 53
glib_micro_req = 1

if glib_minor_req.is_odd()
  glib_min_required = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req - 1)
else
  glib_min_required = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req)
endif

if glib_minor_req.is_odd()
  glib_max_allowed = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req + 1)
else
  glib_max_allowed = 'GLIB_VERSION_@0@_@1@'.format(glib_major_req, glib_minor_req)
endif

glib_req          = '>= @0@.@1@.@2@'.format(glib_major_req, glib_minor_req, glib_micro_req)
pango_req         = '>= 1.37.3'
atk_req           = '>= 2.15.1'
cairo_req         = '>= 1.14.0'
gdk_pixbuf_req    = '>= 2.30.0'
introspection_req = '>= 1.39.0'
wayland_proto_req = '>= 1.7'
wayland_req       = '>= 1.9.91'
mirclient_req     = '>= 0.22.0'
mircookie_req     = '>= 0.17.0'
graphene_req      = '>= 1.5.1'
epoxy_req         = '>= 1.0'
xkbcommon_req     = '>= 0.2.0'

gnome = import('gnome')

add_project_arguments('-DG_LOG_USE_STRUCTURED=1', language: 'c')
add_project_arguments('-DGLIB_MIN_REQUIRED_VERSION=' + glib_min_required, language: 'c')
add_project_arguments('-DGLIB_MAX_ALLOWED_VERSION=' + glib_max_allowed, language: 'c')

# Making releases:
#  1. gtk_micro_version += 1;
#  2. gtk_interface_age += 1;
#  3. if any functions have been added, set gtk_interface_age to 0.
#  4. if backwards compatibility has been broken, we're in trouble
gtk_version       = meson.project_version()
gtk_major_version = gtk_version.split('.')[0].to_int()
gtk_minor_version = gtk_version.split('.')[1].to_int()
gtk_micro_version = gtk_version.split('.')[2].to_int()
gtk_interface_age = 0
add_project_arguments('-DGTK_VERSION="@0@"'.format(meson.project_version()), language: 'c')

add_project_arguments('-D_GNU_SOURCE', language: 'c')

gtk_debug_cflags = []
buildtype = get_option('buildtype')
if buildtype == 'debugoptimized' or buildtype == 'debug'
  gtk_debug_cflags += '-DG_ENABLE_DEBUG'
  if buildtype == 'debug'
    gtk_debug_cflags += '-DG_ENABLE_CONSISTENCY_CHECKS'
  else
    gtk_debug_cflags += '-DG_DISABLE_CAST_CHECKS'
  endif
else
  gtk_debug_cflags += [ '-DG_DISABLE_ASSERT', '-DG_DISABLE_CAST_CHECKS', '-DG_DISABLE_CHECKS', ]
endif

add_project_arguments(gtk_debug_cflags, language: 'c')

# Define a string for the earliest version that this release has
# backwards binary compatibility with for all interfaces a module
# might. Unless we add module-only API with lower stability
# guarantees, this should be unchanged until we break binary compat
# for GTK+.
gtk_binary_version = '4.0.0'

gtk_binary_age = 100 * gtk_minor_version + gtk_micro_version

gtk_soversion = '0.@0@.@1@'.format(gtk_binary_age - gtk_interface_age, gtk_interface_age)

gtk_api_version = '4.0'

x11_enabled      = get_option('enable-x11-backend')
wayland_enabled  = get_option('enable-wayland-backend')
broadway_enabled = get_option('enable-broadway-backend')
mir_enabled      = get_option('enable-mir-backend')
quartz_enabled   = get_option('enable-quartz-backend')
win32_enabled    = get_option('enable-win32-backend')

os_unix   = false
os_linux  = false
os_win32  = false
os_darwin = false

if host_machine.system().contains('darwin')
  os_darwin = true
elif host_machine.system().contains('mingw')
  os_win32 = true
elif host_machine.system().contains('linux')
  os_linux = true
endif

os_unix = not os_win32

gtk_prefix = get_option('prefix')
gtk_includedir = join_paths(gtk_prefix, get_option('includedir'))
gtk_libdir = join_paths(gtk_prefix, get_option('libdir'))
gtk_datadir = join_paths(gtk_prefix, get_option('datadir'))
gtk_localedir = join_paths(gtk_prefix, get_option('localedir'))
gtk_sysconfdir = join_paths(gtk_prefix, get_option('sysconfdir'))
gtk_applicationsdir = join_paths(gtk_datadir, 'applications')
gtk_schemasdir = join_paths(gtk_datadir, 'glib-2.0/schemas')

cc = meson.get_compiler('c')

cdata = configuration_data()
cdata.set_quoted('PACKAGE_VERSION', meson.project_version())
cdata.set_quoted('GTK_LOCALEDIR', gtk_localedir)
cdata.set_quoted('GTK_DATADIR', gtk_datadir)
cdata.set_quoted('GTK_LIBDIR', gtk_libdir)
cdata.set_quoted('GTK_SYSCONFDIR', gtk_sysconfdir)
cdata.set_quoted('GETTEXT_PACKAGE', 'gtk40')
cdata.set('GTK_MAJOR_VERSION', gtk_major_version)
cdata.set('GTK_MINOR_VERSION', gtk_minor_version)
cdata.set('GTK_MICRO_VERSION', gtk_micro_version)
cdata.set('GTK_BINARY_AGE', gtk_binary_age)
cdata.set('GTK_INTERFACE_AGE', gtk_interface_age)

check_headers = [
  'crt/externs.h',
  'dlfcn.h',
  'ftw.h',
  'inttypes.h',
  'linux/memfd.h',
  'locale.h',
  'memory.h',
  'stdint.h',
  'stdlib.h',
  'strings.h',
  'string.h',
  'sys/mman.h',
  'sys/param.h',
  'sys/stat.h',
  'sys/sysinfo.h',
  'sys/systeminfo.h',
  'sys/time.h',
  'sys/types.h',
  'unistd.h',
]

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

# Maths functions might be implemented in libm
libm = cc.find_library('m', required: false)

check_functions = [
  'dcgettext',
  'getpagesize',
  'getresuid',
  'lstat',
  'mmap',
  'nearbyint',
  'posix_fallocate',
  '_lock_file',
  'flockfile',
  'mkstemp',
  'mallinfo',
  'round',
  'rint',
  'log2',
  'exp2',
  'sincos',
]

foreach func : check_functions
  if cc.has_function(func, dependencies: libm)
    cdata.set('HAVE_' + func.underscorify().to_upper(), 1)
  endif
endforeach

cdata.set('HAVE_DECL_ISINF', cc.has_header_symbol('math.h', 'isinf'))
cdata.set('HAVE_DECL_ISNAN', cc.has_header_symbol('math.h', 'isnan'))

# Disable deprecation checks for all libraries we depend on on stable branches.
# This is so newer versions of those libraries don't cause more warnings with
# a stable GTK version.
# We don't ever want to turn off deprecation warnings for master however, because
# that's where we get rid of deprecated API we use.
if gtk_minor_version.is_even()
  cdata.set('GLIB_DISABLE_DEPRECATION_WARNINGS', 1)
endif

# Compiler flags
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 = [
    '-we4002', # too many actual parameters for macro
    '-we4003', # not enough actual parameters for macro
    '-w14010', # single-line comment contains line-continuation character
    '-we4013', # 'function' undefined; assuming extern returning int
    '-w14016', # no function return type; using int as default
    '-we4020', # too many actual parameters
    '-we4021', # too few actual parameters
    '-we4027', # function declared without formal parameter list
    '-we4029', # declared formal parameter list different from definition
    '-we4033', # 'function' must return a value
    '-we4035', # 'function' : no return value
    '-we4045', # array bounds overflow
    '-we4047', # different levels of indirection
    '-we4049', # terminating line number emission
    '-we4053', # an expression of type void was used as an operand
    '-we4071', # no function prototype given
    '-we4819', # the file contains a character that cannot be represented in the current code page
  ]
elif cc.get_id() == 'gcc' or cc.get_id() == 'clang'
  test_cflags = [
    '-fno-strict-aliasing',
    '-Wpointer-arith',
    '-Wmissing-declarations',
    '-Wimplicit-function-declaration',
    '-Wformat=2',
    '-Wformat-nonliteral',
    '-Wformat-security',
    '-Wstrict-prototypes',
    '-Wmissing-prototypes',
    '-Wnested-externs',
    '-Wold-style-definition',
    '-Wundef',
    '-Wunused',
    '-Wcast-align',
    '-Wmissing-noreturn',
    '-Wmissing-format-attribute',
    '-Wmissing-include-dirs',
    '-Wlogical-op',
    '-Wno-uninitialized',
    '-Wno-shadow',
    '-Wno-int-conversion',
    '-Wno-discarded-qualifiers',
    '-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',
  ]
else
  test_cflags = []
endif

common_cflags = []
foreach cflag: test_cflags
  if cc.has_argument(cflag)
    common_cflags += [ cflag ]
  endif
endforeach

# Symbol visibility
if get_option('default_library') != 'static'
  if host_machine.system() == 'windows'
    cdata.set('DLL_EXPORT', true)
    cdata.set('_GDK_EXTERN', '__declspec(dllexport) extern')
    if cc.get_id() != 'msvc'
      common_cflags += ['-fvisibility=hidden']
    endif
  else
    cdata.set('_GDK_EXTERN', '__attribute__((visibility("default"))) extern')
    common_cflags += ['-fvisibility=hidden']
  endif
endif

common_ldflags = []

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
if host_machine.system() == 'darwin'
  common_ldflags += [ '-compatibility_version 1', '-current_version 1.0', ]
endif

confinc = include_directories('.')
gdkinc = include_directories('gdk')
gskinc = include_directories('gsk')
gtkinc = include_directories('gtk')
testinc = include_directories('tests')

# Dependencies
glib_dep       = dependency('glib-2.0', version: glib_req)
giounix_dep    = dependency('gio-unix-2.0', version: glib_req, required: false)
pango_dep      = dependency('pango', version: pango_req)
pangoft_dep    = dependency('pangoft2', required: wayland_enabled or x11_enabled)
cairo_dep      = dependency('cairo', version: cairo_req)
pangocairo_dep = dependency('pangocairo', version: cairo_req)
cairogobj_dep  = dependency('cairo-gobject', version: cairo_req)
pixbuf_dep     = dependency('gdk-pixbuf-2.0', version: gdk_pixbuf_req)
epoxy_dep      = dependency('epoxy', version: epoxy_req,
                            fallback: ['libepoxy', 'libepoxy_dep'])
atk_dep        = dependency('atk', version: atk_req)
gmodule_dep    = dependency('gmodule-2.0', version: glib_req)
harfbuzz_dep   = dependency('harfbuzz', version: '>= 0.9', required: false)
xkbdep         = dependency('xkbcommon', version: xkbcommon_req)
graphene_dep   = dependency('graphene-gobject-1.0', version: graphene_req,
                            fallback: ['graphene', 'graphene_dep'])

fontconfig_dep = [] # only used in x11 backend
atkbridge_dep  = [] # only used in x11 backend

backend_immodules = []

pc_gdk_extra_libs = []

cairo_backends = []
foreach backend: [ ['cairo-xlib', cairo_req, x11_enabled],
                   ['cairo-win32', cairo_req, win32_enabled],
                   ['cairo-quartz', cairo_req, quartz_enabled],
                   ['cairo', cairo_req, broadway_enabled or wayland_enabled or mir_enabled], ]
 backend_enabled = backend.get(2)
 cairo_backend_req = backend.get(1)
 cairo_backend = backend.get(0)
 if backend_enabled
   dependency(cairo_backend, version: cairo_backend_req)
   cairo_backends += [ cairo_backend ]
 endif
endforeach

atk_pkgs = ['atk']

wayland_pkgs = []
if wayland_enabled
  wlclientdep    = dependency('wayland-client', version:  wayland_req)
  wlprotocolsdep = dependency('wayland-protocols', version: wayland_proto_req)
  wlcursordep    = dependency('wayland-cursor', version: wayland_req)
  wlegldep       = dependency('wayland-egl')

  wayland_pkgs = [
    'wayland-client', wayland_req,
    'wayland-protocols', wayland_proto_req,
    'xkbcommon', xkbcommon_req,
    'wayland-cursor', wayland_req,
    'wayland-egl',
  ]
endif

x11_pkgs = []
if x11_enabled
  xrandr_dep     = dependency('xrandr', version: '>= 1.2.99')
  xrandr15_dep   = dependency('xrandr', version: '>= 1.5', required: false)
  x11_dep        = dependency('x11')
  xrender_dep    = dependency('xrender')
  xi_dep         = dependency('xi')
  xext_dep       = dependency('xext')
  xcursor_dep    = dependency('xcursor', required: false)
  xdamage_dep    = dependency('xdamage', required: false)
  xfixes_dep     = dependency('xfixes', required: false)
  xcomposite_dep = dependency('xcomposite', required: false)
  fontconfig_dep = dependency('fontconfig')
  atkbridge_dep  = dependency('atk-bridge-2.0', version: atk_req)

  backend_immodules += ['xim']

  x11_pkgs = ['fontconfig', 'x11', 'xext', 'xi', 'xrandr']

  if xcursor_dep.found()
    x11_pkgs += ['xcursor']
  endif
  if xfixes_dep.found()
    x11_pkgs += ['xfixes']
  endif
  if xcomposite_dep.found()
    x11_pkgs += ['xcomposite']
  endif
  if xdamage_dep.found()
    x11_pkgs += ['xdamage']
  endif

  atk_pkgs += ['atk-bridge-2.0']

  cdata.set('HAVE_XDAMAGE', xdamage_dep.found())
  cdata.set('HAVE_XCURSOR', xcursor_dep.found())
  cdata.set('HAVE_XCOMPOSITE', xcomposite_dep.found())
  cdata.set('HAVE_XFIXES', xfixes_dep.found())

  if cc.has_function('XkbQueryExtension', dependencies: x11_dep,
                     prefix : '#include <X11/XKBlib.h>')
    cdata.set('HAVE_XKB', 1)
  endif

  if cc.has_function('XSyncQueryExtension', dependencies: xext_dep,
                     prefix: '''#include <X11/Xlib.h>
                                #include <X11/extensions/sync.h>''')
    cdata.set('HAVE_XSYNC', 1)
  endif

  if cc.has_function('XGetEventData', dependencies: x11_dep)
    cdata.set('HAVE_XGENERICEVENTS', 1)
  endif

  if xi_dep.found() and cc.has_header('X11/extensions/XInput2.h', dependencies: xi_dep)
    cdata.set('XINPUT_2', 1)
    # Note that we also check that the XIScrollClassInfo struct is defined,
    # because at least Ubuntu Oneiric seems to have XIAllowTouchEvents(),
    # but not the XIScrollClassInfo struct
    has_allow_touch_evens = cc.has_function('XIAllowTouchEvents', dependencies: xi_dep)
    has_scroll_class_info = cc.has_member('XIScrollClassInfo', 'number', dependencies: xi_dep,
                                          prefix: '''#include <X11/Xlib.h>
                                                     #include <X11/extensions/XInput2.h>''')
    if has_allow_touch_evens and has_scroll_class_info
      cdata.set('XINPUT_2_2', 1)
    endif
  endif

  enable_xinerama = get_option('enable-xinerama')
  if enable_xinerama != 'no'
    want_xinerama = enable_xinerama == 'yes'
    xinerama_dep = dependency('xinerama', required: want_xinerama)
    if xinerama_dep.found() and cc.has_header_symbol('X11/extensions/Xinerama.h', 'XineramaQueryExtension', dependencies: xinerama_dep)
      cdata.set('HAVE_XFREE_XINERAMA', 1)
      x11_pkgs += ['xinerama']
    endif
  else
    xinerama_dep = []
  endif

  cdata.set('HAVE_RANDR', xrandr_dep.found())
  cdata.set('HAVE_RANDR15', xrandr15_dep.found())
endif

mir_pkgs = []
if mir_enabled
  mirclient_dep = dependency('mirclient', version: mirclient_req)
  mircookie_dep = dependency('mircookie', version: mircookie_req)
  libcontent_hub_glib_dep = dependency('libcontenthub-glib')

  mir_pkgs = [
    'mirclient', mirclient_req,
    'mircookie', mircookie_req,
    'libcontent-hub-glib',
  ]
endif

if broadway_enabled
  pc_gdk_extra_libs += ['-lz']
  backend_immodules += ['broadway']
endif

if quartz_enabled
  pc_gdk_extra_libs += ['-framework Cocoa', '-framework Carbon']
  backend_immodules += ['quartz']
endif

if win32_enabled
  pc_gdk_extra_libs += ['-lgdi32', '-limm32', '-lshell32', '-lole32',
                        '-Wl,-luuid', '-lwinmm', '-ldwmapi', '-lsetupapi',
                        '-lcfgmgr32']
  backend_immodules += ['ime']
endif

# Check for bind_textdomain_codeset, including -lintl if GLib brings it in
if cc.has_function('bind_textdomain_codeset', dependencies: glib_dep)
  cdata.set('HAVE_BIND_TEXTDOMAIN_CODESET', 1)
endif

cdata.set('HAVE_GIO_UNIX', giounix_dep.found())

# Check for Vulkan support
# TODO: move to gsk subfolder maybe? Or will it be used elsewhere too?
have_vulkan = false
vulkan_lib = []
enable_vulkan = get_option('enable-vulkan')
if enable_vulkan != 'no'
  vulkan_lib = cc.find_library('vulkan', required: false)
  if vulkan_lib.found() and cc.has_function('vkCreateInstance', dependencies: vulkan_lib) and cc.has_header('vulkan/vulkan.h')
    have_vulkan = true
    pc_gdk_extra_libs += ['-lvulkan']
  elif enable_vulkan == 'yes'
    error('Vulkan support not found, but was explicitly requested.')
  endif
else
  message('Vulkan support explicitly disabled')
endif

subdir('modules/input')
subdir('gdk')
subdir('gsk')
subdir('gtk')
subdir('demos')
subdir('modules')
subdir('tests')
subdir('testsuite')
subdir('examples')

# config.h
configure_file(input: 'config.h.meson',
               output: 'config.h',
               configuration: cdata)

# pkg-config files - bit of a mess all of this
pkgconf = configuration_data()

pkgconf.set('prefix', get_option('prefix'))
pkgconf.set('exec_prefix', '${prefix}')
pkgconf.set('libdir', '${prefix}/@0@'.format(get_option('libdir')))
pkgconf.set('includedir', '${prefix}/@0@'.format(get_option('includedir')))
pkgconf.set('GTK_API_VERSION', gtk_api_version)
pkgconf.set('VERSION', meson.project_version())
pkgconf.set('GTK_BINARY_VERSION', gtk_binary_version)
pkgconf.set('host', '@0@-@1@'.format(host_machine.cpu_family(), host_machine.system())) # FIXME

# Requires
pango_pkgname = win32_enabled ? 'pangowin32' : 'pango'
pkgconf.set('GDK_PACKAGES',
            ' '.join([ pango_pkgname, pango_req,
                       'pangocairo', pango_req,
                       'gdk-pixbuf-2.0', gdk_pixbuf_req,
                       'cairo', cairo_req,
                       'cairo-gobject', cairo_req ]))
pkgconf.set('GSK_PACKAGES',
            ' '.join([ 'graphene-gobject-1.0', graphene_req ]))
pkgconf.set('GTK_PACKAGES',
            ' '.join([ 'atk', atk_req,
                       'gio-2.0', glib_req ]))

# Requires.private
gio_pkgname = os_unix ? 'gio-unix-2.0' : 'gio-2.0'
pkgconf.set('GDK_PRIVATE_PACKAGES',
            ' '.join([ gio_pkgname, glib_req,
                       'epoxy', epoxy_req ] + x11_pkgs + wayland_pkgs + mir_pkgs + cairo_backends))
pkgconf.set('GSK_PRIVATE_PACKAGES', '') # all already in GDK_PRIVATE_PACKAGES
pangoft2_pkgs = (wayland_enabled or x11_enabled) ? ['pangoft2'] : []
pkgconf.set('GTK_PRIVATE_PACKAGES', ' '.join(atk_pkgs + pangoft2_pkgs))

pkgconf.set('GDK_EXTRA_LIBS', ' '.join(pc_gdk_extra_libs))
pkgconf.set('GSK_EXTRA_LIBS', '')
pkgconf.set('GTK_EXTRA_LIBS', '')

pkgconf.set('GDK_EXTRA_CFLAGS', '')
pkgconf.set('GSK_EXTRA_CFLAGS', '')
pkgconf.set('GTK_EXTRA_CFLAGS', '')

pkg_install_dir = join_paths(get_option('libdir'), 'pkgconfig')

pkgs = [ 'gtk+-4.0.pc' ]

pkg_targets = ''
foreach backend: [ 'broadway', 'mir', 'quartz', 'wayland', 'win32', 'x11', ]
  if get_variable('@0@_enabled'.format(backend))
    pkgs += ['gtk+-@0@-4.0.pc'.format(backend)]
    pkg_targets += ' ' + backend
  endif
endforeach
pkgconf.set('GDK_BACKENDS', pkg_targets.strip())

foreach pkg: pkgs
  configure_file(input: 'gtk+-4.0.pc.in',
                 output: pkg,
                 configuration: pkgconf,
                 install_dir: pkg_install_dir)
endforeach

if host_machine.system() != 'windows'
  configure_file(input: 'gtk+-unix-print-4.0.pc.in',
                 output: 'gtk+-unix-print-4.0.pc',
                 configuration: pkgconf,
                 install_dir: pkg_install_dir)
endif

subdir('po')
subdir('po-properties')

if get_option('enable-documentation')
  subdir('docs/tools')
  subdir('docs/reference')
endif

summary = [
  '',
  '------',
  'GTK+ @0@ (@1@)'.format(gtk_version, gtk_api_version),
  '',
  '  Enabled backends: @0@'.format(pkg_targets.strip()),
  '  Documentation: @0@'.format(get_option('enable-documentation')),
  '  Vulkan support: @0@'.format(have_vulkan),
  '------',
  ''
]

message('\n'.join(summary))

# Keep this in sync with post-install.sh expected arguments
meson.add_install_script('build-aux/meson/post-install.sh',
                         gtk_api_version,
                         gtk_binary_version,
                         gtk_libdir,
                         gtk_datadir)