Embed icon into windows executable and titlebar

This also applies to X11 when using the glutin frontend

Cargo.toml

@@ -8,6 +8,9 @@ build = "build.rs"
 [build-dependencies]
 vergen = "3"
 
+[target.'cfg(windows)'.build-dependencies]
+embed-resource = "1.1"
+
 [dependencies]
 base91 = { path = "base91" }
 bitflags = "1.0"
@@ -20,7 +23,7 @@ failure_derive = "0.1"
 foreign-types = "0.3"
 freetype = { path = "deps/freetype" }
 gl = "0.11"
-glium = { version = "0.23", default-features = false, features = ["glutin"]}
+glium = { version = "0.23", default-features = false, features = ["glutin", "icon_loading"]}
 harfbuzz = { path = "deps/harfbuzz" }
 lazy_static = "1.3"
 leb128 = "0.2"

assets/windows/manifest.manifest

@@ -0,0 +1,9 @@
+<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1"
+    manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3" >
+  <asmv3:application>
+    <asmv3:windowsSettings xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
+      <dpiAwareness>PerMonitorV2, unaware</dpiAwareness>
+    </asmv3:windowsSettings>
+  </asmv3:application>
+</assembly>

assets/windows/resource.rc

@@ -0,0 +1,5 @@
+#define IDI_ICON 0x101
+IDI_ICON ICON "terminal.ico"
+#define RT_MANIFEST 24
+#define APP_MANIFEST 1
+APP_MANIFEST RT_MANIFEST manifest.manifest

build.rs

@@ -7,4 +7,7 @@ fn main() {
 
     // Generate the 'cargo:' key output
     generate_cargo_keys(ConstantsFlags::all()).expect("Unable to generate the cargo keys!");
+
+    #[cfg(windows)]
+    embed_resource::compile("assets/windows/resource.rc");
 }

src/frontend/glium/window.rs

@@ -214,6 +214,9 @@ impl GliumTerminalWindow {
                 .with_pixel_format(24, 8);
             let window = glutin::WindowBuilder::new()
                 .with_dimensions(logical_size)
+                .with_window_icon(Some(glutin::Icon::from_bytes(include_bytes!(
+                    "../../../assets/icon/terminal.png"
+                ))?))
                 .with_title("wezterm");
 
             let mut_loop = event_loop.event_loop.borrow_mut();