[pango/pango1-dwrite: 2/6] build: Check for DirectWrite support

[Chun-wei Fan <fanchunwei src gnome org>]

commit d64c1d62acb4a23abf3e645ded5c6f1ab39ebf0f
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jul 6 16:58:41 2022 +0800

    build: Check for DirectWrite support
    
    ...in Cairo, as well as their presence in the SDKs.  We want to use
    items in DirectWrite to help us improve support on Windows regarding
    looking up for features (description) of a font.
    
    Since upstream Cairo gained DirectWrite support very recently, check for
    it only via pkg-config, since Cairo had Meson build support quite a bit before
    that happened.

 meson.build       | 10 ++++++++++
 pango/meson.build |  1 +
 2 files changed, 11 insertions(+)
---
diff --git a/meson.build b/meson.build
index 48ca0d77c..71463bdfa 100644
--- a/meson.build
+++ b/meson.build
@@ -46,6 +46,7 @@ osx_current = pango_binary_age - pango_interface_age + 1
 pango_osxversion = [osx_current, '@0@.@1@.0'.format(osx_current, pango_interface_age)]
 
 cc = meson.get_compiler('c')
+cpp = meson.get_compiler('cpp')
 host_system = host_machine.system()
 
 # Compiler and linker flags
@@ -393,6 +394,11 @@ cairo_dep = dependency('cairo', version: cairo_req_version, required: cairo_opti
 
 if cairo_dep.found()
   cairo_found_type = cairo_dep.type_name()
+  if host_system == 'windows'
+    cairo_dwrite_dep = dependency('cairo-win32-dwrite-font', version: cairo_req_version, required: false)
+  else
+    cairo_dwrite_dep = disabler()
+  endif
 else
   if cc.get_id() == 'msvc' and cc.has_header('cairo.h')
     cairo_dep = cc.find_library('cairo', required: cairo_option)
@@ -566,6 +572,10 @@ if cairo_dep.found()
   endif
 endif
 
+if cairo_dwrite_dep.found()
+  pango_conf.set('HAVE_CAIRO_WIN32_DIRECTWRITE', 1)
+endif
+
 # libsysprof-capture support
 libsysprof_capture_dep = dependency('sysprof-capture-4',
   required: get_option('sysprof'),
diff --git a/pango/meson.build b/pango/meson.build
index 1a4b41419..d6b2d81cd 100644
--- a/pango/meson.build
+++ b/pango/meson.build
@@ -429,6 +429,7 @@ if host_system == 'windows'
   pangowin32_deps = pango_deps + [
     libpango_dep,
     cc.find_library('gdi32'),
+    cc.find_library('dwrite'),
   ]
 
   pangowin32_rc = configure_file(