Fix blood canvas timing + add new span for canvas blocks

Makefile

@@ -2,7 +2,7 @@
 # EXAMPLE=animated_text
 # EXAMPLE=animated_sprites
 # EXAMPLE=alpha_sprite
-# EXAMPLE=blood_canvas
+EXAMPLE=blood_canvas
 # EXAMPLE=bloom
 # EXAMPLE=custom_config
 # EXAMPLE=cooldowns
@@ -26,7 +26,7 @@
 # EXAMPLE=physics
 # EXAMPLE=post_processing
 # EXAMPLE=render-target
-EXAMPLE=screenshot_history
+# EXAMPLE=screenshot_history
 # EXAMPLE=sprite
 # EXAMPLE=shapes
 # EXAMPLE=sound

comfy-wgpu/src/blood_canvas.rs

@@ -9,6 +9,8 @@ pub fn blood_canvas_update_and_draw(f: fn(IVec2, &CanvasBlock)) {
     let canvas = &mut *canvas;
 
     for (_, block) in canvas.blocks.iter_mut() {
+        let _span = span!("canvas_block");
+
         if block.modified {
             // info!("updating block at {}", key);
             block.modified = false;

comfy/src/update_stages.rs

@@ -359,7 +359,7 @@ fn render_text(c: &mut EngineContext) {
 }
 
 fn update_blood_canvas(_c: &mut EngineContext) {
-    let _span = span!("blood_canvas");
+    span_with_timing!("blood_canvas");
 
     // TODO: this really doesn't belong here
     blood_canvas_update_and_draw(|key, block| {