Setup infra for headless examples

.gitignore

@@ -1,4 +1,7 @@
 /target
 Cargo.lock
+
 examples/assets/downloads/*
 !examples/assets/downloads/.tracked
+examples/headless/outputs/*
+!examples/headless/outputs/.tracked

Cargo.toml

@@ -4,6 +4,7 @@ resolver = "2"
 members = [
     "integrations/vello_svg",
 
+    "examples/headless",
     "examples/with_winit",
     "examples/with_bevy",
     "examples/run_wasm",

examples/headless/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "headless"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+vello = { path = "../../" }
+clap = { workspace = true }

examples/headless/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}

src/lib.rs

@@ -196,7 +196,7 @@ impl Renderer {
                 return Err("channel was closed".into());
             }
             let mapped = buf_slice.get_mapped_range();
-            println!("{:?}", bytemuck::cast_slice::<_, u32>(&mapped));
+            // println!("{:?}", bytemuck::cast_slice::<_, u32>(&mapped));
         }
         // TODO: apply logic to determine whether we need to rerun coarse, and also
         // allocate the blend stack as needed.