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

1 files changed, 15 insertions, 4 deletions

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() ],
 ]