an optimized code that was not used

```js
const id = engine.pixel ?? engine.canvas_ctx.createImageData(1,1);
const color = engine.canvas_ctx.fillStyle.replace(/^#/, '');
const data = id.data;
data[0] = parseInt(color.substring(0, 2), 16);
data[1] = parseInt(color.substring(2, 4), 16);
data[2] = parseInt(color.substring(4, 6), 16);
data[3] = parseInt(color.substring(6, 8), 16);
engine.canvas_ctx.putImageData(id, x, y);
engine.pixel = id;
```

Search the JavaScript codebase for engine.pixel, engine.canvas_ctx, and the shown image-data snippet to find its intended entry point. Read the surrounding drawing flow and determine whether this optimized path is expected to be used; done means its intended behavior is established and the unused-code issue is resolved in that flow.

Written by the indexing model from the issue text.