meson: Make X11 support an optional feature

Closes #255

Part-of: <https://gitlab.gnome.org/GNOME/loupe/-/merge_requests/326>

Cargo.toml

@@ -11,6 +11,7 @@ codegen-units = 1
 
 [features]
 disable-glycin-sandbox = []
+x11 = ["ashpd/gtk4_x11"]
 
 [dependencies]
 anyhow = { version = "1.0.66", features = ["backtrace"] }
@@ -30,7 +31,7 @@ url = "2.3.1"
 
 [dependencies.ashpd]
 version = "0.7.0"
-features = ["gtk4"]
+features = ["gtk4_wayland"]
 
 [dependencies.gtk]
 package = "gtk4"

meson.build

@@ -14,6 +14,9 @@ dependency('gweather4', version: '>=4.0.0')
 # Required by glycin crate
 dependency('lcms2', version: '>=2.12.0')
 
+# Optional dependencies
+gtk4_x11 = dependency('gtk4-x11', required: get_option('x11'))
+
 cargo = find_program('cargo', required: true)
 glib_compile_schemas = find_program('glib-compile-schemas', required: true)
 

meson_options.txt

@@ -7,11 +7,16 @@ option(
     'development',
     'ci',
   ],
-  value: 'release'
+  value: 'release',
 )
 option(
   'disable-glycin-sandbox',
   type: 'boolean',
   description: 'Disable sandboxing of image loaders in glycin. Only intended for development purposes.',
-  value: false
+  value: false,
+)
+option(
+  'x11',
+  type: 'feature',
+  description: 'Enable X11 specific features.',
 )

src/meson.build

@@ -27,6 +27,10 @@ else
   message('Building in release mode')
 endif
 
+if gtk4_x11.found()
+  cargo_options += [ '--features', 'x11' ]
+endif
+
 if get_option('disable-glycin-sandbox')
   cargo_options += [ '--features', 'disable-glycin-sandbox' ]
 endif