Make use of glutin wayland/x11 features

This should allow users that are not using Wayland/X11
to reduce the resulted binary size and compilation times.

7 files changed, 98 insertions, 68 deletions

diff --git a/.builds/freebsd.yml b/.builds/freebsd.yml
index d95b0fb0..10f0333a 100644
--- a/.builds/freebsd.yml
+++ b/.builds/freebsd.yml
@@ -12,10 +12,16 @@ sources:
 tasks:
   - rustup: |
       curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain stable --profile minimal
-  - 1-43-1: |
       $HOME/.cargo/bin/rustup toolchain install --profile minimal 1.43.1
+  - 1-43-1: |
       cd alacritty
       $HOME/.cargo/bin/cargo +1.43.1 test
+  - 1-43-1-wayland: |
+      cd alacritty/alacritty
+      $HOME/.cargo/bin/cargo +1.43.1 test --no-default-features --features=wayland
+  - 1-43-1-x11: |
+      cd alacritty/alacritty
+      $HOME/.cargo/bin/cargo +1.43.1 test --no-default-features --features=x11
   - stable: |
       cd alacritty
       $HOME/.cargo/bin/cargo +stable test
diff --git a/Cargo.lock b/Cargo.lock
index a77f0ff2..e09b35f0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -847,9 +847,9 @@ checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 
 [[package]]
 name = "glutin"
-version = "0.25.0"
+version = "0.25.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed94c05751b6948879d2b15d49930e16ecc0144e51fcb8cd873686d6c4b5ebed"
+checksum = "d8bae26a39a728b003e9fad473ea89527de0de050143b4df866f18bb154bc86e"
 dependencies = [
  "android_glue",
  "cgl",
diff --git a/alacritty/Cargo.toml b/alacritty/Cargo.toml
index 1bacd0cf..a8ae5196 100644
--- a/alacritty/Cargo.toml
+++ b/alacritty/Cargo.toml
@@ -21,7 +21,7 @@ fnv = "1"
 serde = { version = "1", features = ["derive"] }
 serde_yaml = "0.8"
 serde_json = "1"
-glutin = { version = "0.25.0", features = ["serde"] }
+glutin = { version = "0.25.1", default-features = false, features = ["serde"] }
 notify = "4"
 parking_lot = "0.11.0"
 crossfont = { version = "0.1.0", features = ["force_system_fontconfig"] }
@@ -47,8 +47,8 @@ objc = "0.2.2"
 dirs = "2.0.2"
 
 [target.'cfg(not(any(target_os="windows", target_os="macos")))'.dependencies]
-x11-dl = "2"
-wayland-client = { version = "0.28.0", features = ["dlopen"] }
+x11-dl = { version = "2", optional = true }
+wayland-client = { version = "0.28.0", features = ["dlopen"], optional = true }
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3.7", features = ["impl-default", "wincon"]}
@@ -58,8 +58,8 @@ embed-resource = "1.3"
 
 [features]
 default = ["wayland", "x11", "winpty"]
-x11 = ["copypasta/x11"]
-wayland = ["copypasta/wayland"]
+x11 = ["copypasta/x11", "glutin/x11", "x11-dl"]
+wayland = ["copypasta/wayland", "glutin/wayland", "wayland-client"]
 winpty = ["alacritty_terminal/winpty"]
 # Enabling this feature makes shaders automatically reload when changed
 live-shader-reload = []
diff --git a/alacritty/src/display.rs b/alacritty/src/display.rs
index a30d7ad2..a4cf5cc5 100644
--- a/alacritty/src/display.rs
+++ b/alacritty/src/display.rs
@@ -4,7 +4,7 @@
 use std::cmp::min;
 use std::f64;
 use std::fmt::{self, Formatter};
-#[cfg(not(any(target_os = "macos", windows)))]
+#[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
 use std::sync::atomic::Ordering;
 use std::time::Instant;
 
@@ -17,7 +17,7 @@ use glutin::window::CursorIcon;
 use log::{debug, info};
 use parking_lot::MutexGuard;
 use unicode_width::UnicodeWidthChar;
-#[cfg(not(any(target_os = "macos", windows)))]
+#[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
 use wayland_client::{Display as WaylandDisplay, EventQueue};
 
 #[cfg(target_os = "macos")]
@@ -154,14 +154,15 @@ pub struct Display {
     /// Currently highlighted URL.
     pub highlighted_url: Option<Url>,
 
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     pub wayland_event_queue: Option<EventQueue>,
 
+    #[cfg(not(any(target_os = "macos", windows)))]
+    pub is_x11: bool,
+
     renderer: QuadRenderer,
     glyph_cache: GlyphCache,
     meter: Meter,
-    #[cfg(not(any(target_os = "macos", windows)))]
-    is_x11: bool,
 }
 
 impl Display {
@@ -184,11 +185,11 @@ impl Display {
         debug!("Estimated window size: {:?}", estimated_size);
         debug!("Estimated cell size: {} x {}", cell_width, cell_height);
 
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         let mut wayland_event_queue = None;
 
         // Initialize Wayland event queue, to handle Wayland callbacks.
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         if let Some(display) = event_loop.wayland_display() {
             let display = unsafe { WaylandDisplay::from_external_display(display as _) };
             wayland_event_queue = Some(display.create_event_queue());
@@ -199,7 +200,7 @@ impl Display {
             event_loop,
             &config,
             estimated_size,
-            #[cfg(not(any(target_os = "macos", windows)))]
+            #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
             wayland_event_queue.as_ref(),
         )?;
 
@@ -253,8 +254,10 @@ impl Display {
         #[cfg(target_os = "macos")]
         set_font_smoothing(config.ui_config.font.use_thin_strokes());
 
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
         let is_x11 = event_loop.is_x11();
+        #[cfg(not(any(feature = "x11", target_os = "macos", windows)))]
+        let is_x11 = false;
 
         // On Wayland we can safely ignore this call, since the window isn't visible until you
         // actually draw something into it and commit those changes.
@@ -296,7 +299,7 @@ impl Display {
             highlighted_url: None,
             #[cfg(not(any(target_os = "macos", windows)))]
             is_x11,
-            #[cfg(not(any(target_os = "macos", windows)))]
+            #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
             wayland_event_queue,
         })
     }
@@ -582,12 +585,12 @@ impl Display {
 
         // Frame event should be requested before swaping buffers, since it requires surface
         // `commit`, which is done by swap buffers under the hood.
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         self.request_frame(&self.window);
 
         self.window.swap_buffers();
 
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         if self.is_x11 {
             // On X11 `swap_buffers` does not block for vsync. However the next OpenGl command
             // will block to synchronize (this is `glClear` in Alacritty), which causes a
@@ -662,7 +665,7 @@ impl Display {
 
     /// Requst a new frame for a window on Wayland.
     #[inline]
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     fn request_frame(&self, window: &Window) {
         let surface = match window.wayland_surface() {
             Some(surface) => surface,
diff --git a/alacritty/src/event.rs b/alacritty/src/event.rs
index a4437f6f..d16ffde6 100644
--- a/alacritty/src/event.rs
+++ b/alacritty/src/event.rs
@@ -19,7 +19,7 @@ use glutin::dpi::PhysicalSize;
 use glutin::event::{ElementState, Event as GlutinEvent, ModifiersState, MouseButton, WindowEvent};
 use glutin::event_loop::{ControlFlow, EventLoop, EventLoopProxy, EventLoopWindowTarget};
 use glutin::platform::desktop::EventLoopExtDesktop;
-#[cfg(not(any(target_os = "macos", windows)))]
+#[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
 use glutin::platform::unix::EventLoopWindowTargetExtUnix;
 use log::info;
 use serde_json as json;
@@ -749,7 +749,7 @@ impl<N: Notify + OnResize> Processor<N> {
 
     /// Return `true` if `event_queue` is empty, `false` otherwise.
     #[inline]
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     fn event_queue_empty(&mut self) -> bool {
         let wayland_event_queue = match self.display.wayland_event_queue.as_mut() {
             Some(wayland_event_queue) => wayland_event_queue,
@@ -767,7 +767,7 @@ impl<N: Notify + OnResize> Processor<N> {
 
     /// Return `true` if `event_queue` is empty, `false` otherwise.
     #[inline]
-    #[cfg(any(target_os = "macos", windows))]
+    #[cfg(any(target_os = "macos", windows, not(feature = "wayland")))]
     fn event_queue_empty(&mut self) -> bool {
         self.event_queue.is_empty()
     }
@@ -863,7 +863,7 @@ impl<N: Notify + OnResize> Processor<N> {
 
             // Skip rendering on Wayland until we get frame event from compositor.
             #[cfg(not(any(target_os = "macos", windows)))]
-            if event_loop.is_wayland() && !self.display.window.should_draw.load(Ordering::Relaxed) {
+            if !self.display.is_x11 && !self.display.window.should_draw.load(Ordering::Relaxed) {
                 return;
             }
 
@@ -1114,7 +1114,7 @@ impl<N: Notify + OnResize> Processor<N> {
             processor.ctx.window.set_title(&config.ui_config.window.title);
         }
 
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         if processor.ctx.event_loop.is_wayland() {
             processor.ctx.window.set_wayland_theme(&config.colors);
         }
diff --git a/alacritty/src/main.rs b/alacritty/src/main.rs
index 19ae917b..66806056 100644
--- a/alacritty/src/main.rs
+++ b/alacritty/src/main.rs
@@ -48,7 +48,7 @@ mod scheduler;
 mod url;
 mod window;
 
-#[cfg(not(any(target_os = "macos", windows)))]
+#[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
 mod wayland_theme;
 
 mod gl {
@@ -160,10 +160,7 @@ fn run(
     // The PTY forks a process to run the shell on the slave side of the
     // pseudoterminal. A file descriptor for the master side is retained for
     // reading/writing to the shell.
-    #[cfg(not(any(target_os = "macos", windows)))]
     let pty = tty::new(&config, &display.size_info, display.window.x11_window_id());
-    #[cfg(any(target_os = "macos", windows))]
-    let pty = tty::new(&config, &display.size_info, None);
 
     // Create the pseudoterminal I/O loop.
     //
diff --git a/alacritty/src/window.rs b/alacritty/src/window.rs
index 1d3b0774..e69046de 100644
--- a/alacritty/src/window.rs
+++ b/alacritty/src/window.rs
@@ -1,23 +1,27 @@
 #[rustfmt::skip]
 #[cfg(not(any(target_os = "macos", windows)))]
 use {
-    std::ffi::c_void,
-    std::os::raw::c_ulong,
     std::sync::atomic::AtomicBool,
     std::sync::Arc,
 
     glutin::platform::unix::{EventLoopWindowTargetExtUnix, WindowBuilderExtUnix, WindowExtUnix},
     image::ImageFormat,
-    log::error,
+};
+
+#[rustfmt::skip]
+#[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
+use {
     wayland_client::protocol::wl_surface::WlSurface,
     wayland_client::{Attached, EventQueue, Proxy},
-    x11_dl::xlib::{Display as XDisplay, PropModeReplace, XErrorEvent, Xlib},
 
     alacritty_terminal::config::Colors,
 
     crate::wayland_theme::AlacrittyWaylandTheme,
 };
 
+#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
+use x11_dl::xlib::{Display as XDisplay, PropModeReplace, XErrorEvent, Xlib};
+
 use std::fmt::{self, Display, Formatter};
 
 use glutin::dpi::{PhysicalPosition, PhysicalSize};
@@ -134,7 +138,7 @@ pub struct Window {
     pub should_draw: Arc<AtomicBool>,
 
     /// Attached Wayland surface to request new frame events.
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     pub wayland_surface: Option<Attached<WlSurface>>,
 
     /// Cached DPR for quickly scaling pixel sizes.
@@ -153,20 +157,23 @@ impl Window {
         event_loop: &EventLoop<E>,
         config: &Config,
         size: Option<PhysicalSize<u32>>,
-        #[cfg(not(any(target_os = "macos", windows)))] wayland_event_queue: Option<&EventQueue>,
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
+        wayland_event_queue: Option<&EventQueue>,
     ) -> Result<Window> {
         let window_config = &config.ui_config.window;
         let window_builder = Window::get_platform_window(&window_config.title, &window_config);
 
-        // Disable vsync on Wayland.
-        #[cfg(not(any(target_os = "macos", windows)))]
-        let vsync = !event_loop.is_wayland();
-        #[cfg(any(target_os = "macos", windows))]
-        let vsync = true;
+        // Check if we're running Wayland to disable vsync.
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
+        let is_wayland = event_loop.is_wayland();
+        #[cfg(any(target_os = "macos", windows, not(feature = "wayland")))]
+        let is_wayland = false;
 
         let windowed_context =
-            create_gl_window(window_builder.clone(), &event_loop, false, vsync, size)
-                .or_else(|_| create_gl_window(window_builder, &event_loop, true, vsync, size))?;
+            create_gl_window(window_builder.clone(), &event_loop, false, !is_wayland, size)
+                .or_else(|_| {
+                    create_gl_window(window_builder, &event_loop, true, !is_wayland, size)
+                })?;
 
         // Text cursor.
         let current_mouse_cursor = CursorIcon::Text;
@@ -175,16 +182,19 @@ impl Window {
         // Set OpenGL symbol loader. This call MUST be after window.make_current on windows.
         gl::load_with(|symbol| windowed_context.get_proc_address(symbol) as *const _);
 
-        #[cfg(not(any(target_os = "macos", windows)))]
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
         let mut wayland_surface = None;
 
-        #[cfg(not(any(target_os = "macos", windows)))]
-        if event_loop.is_x11() {
+        #[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
+        if !is_wayland {
             // On X11, embed the window inside another if the parent ID has been set.
             if let Some(parent_window_id) = window_config.embed {
                 x_embed_window(windowed_context.window(), parent_window_id);
             }
-        } else {
+        }
+
+        #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
+        if is_wayland {
             // Apply client side decorations theme.
             let theme = AlacrittyWaylandTheme::new(&config.colors);
             windowed_context.window().set_wayland_theme(theme);
@@ -203,7 +213,7 @@ impl Window {
             windowed_context,
             #[cfg(not(any(target_os = "macos", windows)))]
             should_draw: Arc::new(AtomicBool::new(true)),
-            #[cfg(not(any(target_os = "macos", windows)))]
+            #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
             wayland_surface,
             dpr,
         })
@@ -254,22 +264,26 @@ impl Window {
 
         let class = &window_config.class;
 
-        let mut builder = WindowBuilder::new()
+        let builder = WindowBuilder::new()
             .with_title(title)
             .with_visible(false)
             .with_transparent(true)
             .with_decorations(window_config.decorations != Decorations::None)
             .with_maximized(window_config.maximized())
             .with_fullscreen(window_config.fullscreen())
-            .with_window_icon(icon.ok())
-            // X11.
-            .with_class(class.instance.clone(), class.general.clone())
-            // Wayland.
-            .with_app_id(class.instance.clone());
+            .with_window_icon(icon.ok());
 
-        if let Some(ref val) = window_config.gtk_theme_variant {
-            builder = builder.with_gtk_theme_variant(val.clone())
-        }
+        #[cfg(feature = "wayland")]
+        let builder = builder.with_app_id(class.instance.clone());
+
+        #[cfg(feature = "x11")]
+        let builder = builder.with_class(class.instance.clone(), class.general.clone());
+
+        #[cfg(feature = "x11")]
+        let builder = match &window_config.gtk_theme_variant {
+            Some(val) => builder.with_gtk_theme_variant(val.clone()),
+            None => builder,
+        };
 
         builder
     }
@@ -312,7 +326,7 @@ impl Window {
         }
     }
 
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
     pub fn set_urgent(&self, is_urgent: bool) {
         self.window().set_urgent(is_urgent);
     }
@@ -326,18 +340,23 @@ impl Window {
         self.window().request_user_attention(RequestUserAttentionType::Critical);
     }
 
-    #[cfg(windows)]
+    #[cfg(any(windows, not(feature = "x11")))]
     pub fn set_urgent(&self, _is_urgent: bool) {}
 
     pub fn set_outer_position(&self, pos: PhysicalPosition<i32>) {
         self.window().set_outer_position(pos);
     }
 
-    #[cfg(not(any(target_os = "macos", windows)))]
+    #[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
     pub fn x11_window_id(&self) -> Option<usize> {
         self.window().xlib_window().map(|xlib_window| xlib_window as usize)
     }
 
+    #[cfg(any(target_os = "macos", windows, not(feature = "x11")))]
+    pub fn x11_window_id(&self) -> Option<usize> {
+        None
+    }
+
     pub fn window_id(&self) -> WindowId {
         self.window().id()
     }
@@ -374,17 +393,22 @@ impl Window {
         self.window().set_simple_fullscreen(simple_fullscreen);
     }
 
-    #[cfg(not(any(target_os = "macos", target_os = "windows")))]
-    pub fn wayland_display(&self) -> Option<*mut c_void> {
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
+    pub fn wayland_display(&self) -> Option<*mut std::ffi::c_void> {
         self.window().wayland_display()
     }
 
-    #[cfg(not(any(target_os = "macos", target_os = "windows")))]
+    #[cfg(any(not(feature = "wayland"), any(target_os = "macos", windows)))]
+    pub fn wayland_display(&self) -> Option<*mut std::ffi::c_void> {
+        None
+    }
+
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     pub fn wayland_surface(&self) -> Option<&Attached<WlSurface>> {
         self.wayland_surface.as_ref()
     }
 
-    #[cfg(not(any(target_os = "macos", target_os = "windows")))]
+    #[cfg(all(feature = "wayland", not(any(target_os = "macos", windows))))]
     pub fn set_wayland_theme(&mut self, colors: &Colors) {
         self.window().set_wayland_theme(AlacrittyWaylandTheme::new(colors));
     }
@@ -415,8 +439,8 @@ impl Window {
     }
 }
 
-#[cfg(not(any(target_os = "macos", windows)))]
-fn x_embed_window(window: &GlutinWindow, parent_id: c_ulong) {
+#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
+fn x_embed_window(window: &GlutinWindow, parent_id: std::os::raw::c_ulong) {
     let (xlib_display, xlib_window) = match (window.xlib_display(), window.xlib_window()) {
         (Some(display), Some(window)) => (display, window),
         _ => return,
@@ -449,8 +473,8 @@ fn x_embed_window(window: &GlutinWindow, parent_id: c_ulong) {
     }
 }
 
-#[cfg(not(any(target_os = "macos", windows)))]
+#[cfg(all(feature = "x11", not(any(target_os = "macos", windows))))]
 unsafe extern "C" fn xembed_error_handler(_: *mut XDisplay, _: *mut XErrorEvent) -> i32 {
-    error!("Could not embed into specified window.");
+    log::error!("Could not embed into specified window.");
     std::process::exit(1);
 }