diff --git a/c/Cargo.toml b/c/Cargo.toml
index ad5125f8..2d0ba52e 100644
--- a/c/Cargo.toml
+++ b/c/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2018"
 capi = []
 
 [lib]
-crate-type = ["staticlib"]
+crate-type = ["staticlib", "cdylib"]
 name = "pathfinder"
 
 [dependencies]
@@ -16,8 +16,13 @@ font-kit = "0.6"
 foreign-types = "0.3"
 gl = "0.14"
 libc = "0.2"
+simple_logger = "4.3"
 usvg = "0.9"
 
+[dependencies.log]
+version = "0.4"
+features = ["max_level_info"]
+
 [dependencies.pathfinder_canvas]
 features = ["pf-text"]
 path = "../canvas"
diff --git a/c/src/lib.rs b/c/src/lib.rs
index 75aa15da..94461f46 100644
--- a/c/src/lib.rs
+++ b/c/src/lib.rs
@@ -27,6 +27,7 @@ use pathfinder_gpu::Device;
 use pathfinder_resources::ResourceLoader;
 use pathfinder_resources::fs::FilesystemResourceLoader;
 use pathfinder_resources::embedded::EmbeddedResourceLoader;
+use pathfinder_renderer::concurrent::executor::SequentialExecutor;
 use pathfinder_renderer::concurrent::rayon::RayonExecutor;
 use pathfinder_renderer::concurrent::scene_proxy::SceneProxy;
 use pathfinder_renderer::gpu::options::{DestFramebuffer, RendererLevel};
@@ -51,6 +52,11 @@ use metal::{self, CoreAnimationDrawableRef, DeviceRef as NativeMetalDeviceRef};
 #[cfg(all(target_os = "macos", not(feature = "pf-gl")))]
 use pathfinder_metal::MetalDevice;
 
+#[no_mangle]
+pub extern "system" fn init_logging() {
+    simple_logger::init_with_env().unwrap();
+}
+
 // Constants
 
 // `canvas`
@@ -272,6 +278,13 @@ pub unsafe extern "C" fn PFCanvasCreateScene(canvas: PFCanvasRef) -> PFSceneRef
     Box::into_raw(Box::new(Box::from_raw(canvas).into_canvas().into_scene()))
 }
 
+// Extensions
+
+#[no_mangle]
+pub unsafe extern "C" fn PFCanvasClear(canvas: PFCanvasRef) {
+    (*canvas).clear()
+}
+
 // Drawing rectangles
 
 #[no_mangle]
@@ -284,6 +297,11 @@ pub unsafe extern "C" fn PFCanvasStrokeRect(canvas: PFCanvasRef, rect: *const PF
     (*canvas).stroke_rect((*rect).to_rust())
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn PFCanvasClearRect(canvas: PFCanvasRef, rect: *const PFRectF) {
+    (*canvas).clear_rect((*rect).to_rust())
+}
+
 // Drawing text
 
 #[no_mangle]
@@ -378,9 +396,13 @@ pub unsafe extern "C" fn PFCanvasSetLineDashOffset(canvas: PFCanvasRef, new_offs
 pub unsafe extern "C" fn PFCanvasSetFontByPostScriptName(canvas: PFCanvasRef,
                                                          postscript_name: *const c_char,
                                                          postscript_name_len: usize) -> i32 {
-    match (*canvas).set_font(to_rust_string(&postscript_name, postscript_name_len)) {
+    let name = to_rust_string(&postscript_name, postscript_name_len);
+    match (*canvas).set_font(name) {
         Ok(_) => 0,
-        Err(_) => 1
+        Err(e) => {
+            log::error!("Failed to set font to {:?}: {:?}", name, e);
+            1
+        }
     }
 }
 
@@ -787,6 +809,15 @@ pub unsafe extern "C" fn PFSceneDestroy(scene: PFSceneRef) {
     drop(Box::from_raw(scene))
 }
 
+#[no_mangle]
+pub unsafe extern "C" fn PFSceneProxyCreateFromSceneAndSequentialExecutor(scene: PFSceneRef,
+                                                                     level: PFRendererLevel)
+                                                                     -> PFSceneProxyRef {
+    Box::into_raw(Box::new(SceneProxy::from_scene(*Box::from_raw(scene),
+                                                  to_rust_renderer_level(level),
+                                                  SequentialExecutor)))
+}
+
 #[no_mangle]
 pub unsafe extern "C" fn PFSceneProxyCreateFromSceneAndRayonExecutor(scene: PFSceneRef,
                                                                      level: PFRendererLevel)
diff --git a/examples/canvas_text/src/main.rs b/examples/canvas_text/src/main.rs
index 39dd1e91..98292f72 100644
--- a/examples/canvas_text/src/main.rs
+++ b/examples/canvas_text/src/main.rs
@@ -25,6 +25,7 @@ use sdl2::keyboard::Keycode;
 use sdl2::video::GLProfile;
 use std::iter;
 use std::sync::Arc;
+use std::time::{Duration, Instant};
 
 fn main() {
     // Set up SDL2.
@@ -34,7 +35,10 @@ fn main() {
     // Make sure we have at least a GL 3.0 context. Pathfinder requires this.
     let gl_attributes = video.gl_attr();
     gl_attributes.set_context_profile(GLProfile::Core);
-    gl_attributes.set_context_version(3, 3);
+    gl_attributes.set_context_version(4, 1);
+    gl_attributes.set_context_flags()
+        .forward_compatible()
+        .set();
 
     // Open a window.
     let window_size = vec2i(640, 480);
@@ -66,17 +70,33 @@ fn main() {
 
     // Wait for a keypress.
     let mut event_pump = sdl_context.event_pump().unwrap();
+    let mut n = 0;
+    let start = Instant::now();
+    let mut last_update = Instant::now();
+    let mut fps_buf = String::new();
     loop {
-        match event_pump.wait_event() {
-            Event::Quit {..} | Event::KeyDown { keycode: Some(Keycode::Escape), .. } => return,
-            Event::Window { win_event: WindowEvent::Exposed, .. } => {
+        match event_pump.poll_event() {
+            Some(Event::Quit {..} | Event::KeyDown { keycode: Some(Keycode::Escape), .. }) => return,
+            Some(Event::Window { win_event: WindowEvent::Exposed, .. }) | None => {
                 // Make a canvas.
                 let mut canvas = Canvas::new(window_size.to_f32()).get_context_2d(font_context.clone());
 
                 // Draw the text.
                 canvas.set_font("Overpass-Regular");
                 canvas.set_font_size(32.0);
+                let now = Instant::now();
+                let elapsed = now.duration_since(last_update);
+                if elapsed >= Duration::from_millis(500) {
+                    last_update = now;
+                    let fps = (n as f64) * ((Duration::from_secs(1).as_micros() as f64) / (elapsed.as_micros() as f64));
+                    fps_buf.clear();
+                    fps_buf.push_str("FPS: ");
+                    use std::fmt::Write;
+                    write!(fps_buf, "{fps:.2}").unwrap();
+                    n = 0;
+                }
                 canvas.fill_text("Hello Pathfinder!", vec2f(32.0, 48.0));
+                canvas.fill_text(&fps_buf, vec2f(32.0, 96.0));
                 canvas.set_text_align(TextAlign::Right);
                 canvas.stroke_text("Goodbye Pathfinder!", vec2f(608.0, 464.0));
 
@@ -86,6 +106,8 @@ fn main() {
                                                        RayonExecutor);
                 scene.build_and_render(&mut renderer, BuildOptions::default());
                 window.gl_swap_window();
+
+                n += 1;
             },
             _ => {}
         }