meson: Check for HarfBuzz and FontConfig for PangoFT2

It is possible that we can have the following situations, at least on
Windows:
-FreeType present, FontConfig missing
-Cairo-FT present, with no FontConfig support.

As gen-script-for-lang requires FontConfig, and PangoFT2 depends on
HarfBuzz, FontConfig and Freetype, we need to check for them before we
build PangoFT2, and so that we could include PangoFT2 support in
PangoCairo.

The tests and pango-view have an optional dependency on PangoFT2, so we
need to also check whether we built PangoFT2 before we try to build
things related to PangoFT2.

For the tools, since gen-script-for-lang.c depends on FontConfig, check
for it as well before we build it.

https://bugzilla.gnome.org/show_bug.cgi?id=783274

6 files changed, 27 insertions, 14 deletions

diff --git a/docs/meson.build b/docs/meson.build
index 40154bac..c784149e 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -59,7 +59,7 @@ html_images = [
 
 docdeps = [ libpango_dep ]
 
-if freetype_dep.found()
+if build_pangoft2
   docdeps += libpangoft2_dep
 endif
 
diff --git a/meson.build b/meson.build
index f2045315..5133d5c1 100644
--- a/meson.build
+++ b/meson.build
@@ -235,7 +235,10 @@ 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() and fontconfig_dep.found()
+
+# 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
@@ -267,6 +270,7 @@ if cairo_dep.found()
   # - 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', ],
@@ -278,8 +282,15 @@ if cairo_dep.found()
   foreach b: cairo_font_backends
     dep = dependency(b[0], version: b[1], required: false)
     if dep.found()
-      pango_conf.set(b[2], 1)
-      pango_font_backends += b[3]
+      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
 
@@ -336,7 +347,7 @@ pkgconf.set('PKGCONFIG_CAIRO_REQUIRES', pangocairo_requires)
 pkgconf_files = [
   [ 'pango.pc' ],
   [ 'pangowin32.pc', host_system == 'windows' ],
-  [ 'pangoft2.pc', freetype_dep.found() ],
+  [ 'pangoft2.pc', build_pangoft2 ],
   [ 'pangoxft.pc', xft_dep.found() ],
   [ 'pangocairo.pc', cairo_dep.found() ],
 ]
diff --git a/pango-view/meson.build b/pango-view/meson.build
index b7aa634b..c607f719 100644
--- a/pango-view/meson.build
+++ b/pango-view/meson.build
@@ -9,12 +9,12 @@ pango_view_deps = [
   libpango_dep,
 ]
 
-if freetype_dep.found()
+if build_pangoft2
   pango_view_sources += 'viewer-pangoft2.c'
   pango_view_deps += libpangoft2_dep
 endif
 
-if xft_dep.found()
+if xft_dep.found() and build_pangoft2
   pango_view_sources += [
     'viewer-pangoxft.c',
     'viewer-x.c',
diff --git a/pango/meson.build b/pango/meson.build
index 93f0740a..3312d72d 100644
--- a/pango/meson.build
+++ b/pango/meson.build
@@ -154,7 +154,7 @@ libpango_dep = declare_dependency(
 )
 
 # FreeType
-if freetype_dep.found()
+if build_pangoft2
   pangoft2_headers = [
     'pango-ot.h',
     'pangofc-font.h',
diff --git a/tests/meson.build b/tests/meson.build
index a4df3bc0..bceb9093 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -24,7 +24,7 @@ tests = [
   [ 'cxx-test', [ 'cxx-test.cpp' ] ],
 ]
 
-if freetype_dep.found()
+if build_pangoft2
   test_cflags += '-DHAVE_FREETYPE'
   tests += [
     [ 'test-ot-tags', [ 'test-ot-tags.c' ], [ libpangoft2_dep ] ],
diff --git a/tools/meson.build b/tools/meson.build
index 37a3be76..37e52434 100644
--- a/tools/meson.build
+++ b/tools/meson.build
@@ -1,5 +1,7 @@
-executable('gen-script-for-lang', 'gen-script-for-lang.c',
-           dependencies: pango_deps + [ libpango_dep ],
-           c_args: common_cflags + pango_debug_cflags + [ '-DPANGO_DISABLE_DEPRECATED' ],
-           include_directories: root_inc,
-           install: false)
+if fontconfig_dep.found()
+  executable('gen-script-for-lang', 'gen-script-for-lang.c',
+             dependencies: pango_deps + [ libpango_dep ],
+             c_args: common_cflags + pango_debug_cflags + [ '-DPANGO_DISABLE_DEPRECATED' ],
+             include_directories: root_inc,
+             install: false)
+endif