---
id: 8745
title: Optimize and Document HeaderCanvas Semantic Effects
state: CLOSED
labels:
  - documentation
  - performance
assignees:
  - tobiu
createdAt: '2026-01-17T03:49:38Z'
updatedAt: '2026-01-17T04:04:16Z'
githubUrl: 'https://github.com/neomjs/neo/issues/8745'
author: tobiu
commentsCount: 1
parentIssue: 8727
subIssues: []
subIssuesCompleted: 0
subIssuesTotal: 0
blockedBy: []
blocking: []
closedAt: '2026-01-17T04:04:16Z'
---
# Optimize and Document HeaderCanvas Semantic Effects

1.  **Performance Audit:** Review `drawHoverOverlay` in `apps/portal/canvas/HeaderCanvas.mjs` for Zero-Allocation compliance.
2.  **Source Documentation:** Enhance `HeaderCanvas.mjs` JSDoc to cover the new Hover/Active interaction model.
3.  **Guide Update:** Add "Semantic State Visualization" section to `learn/guides/advanced/CanvasArchitecture.md`.

## Timeline

- 2026-01-17T03:49:39Z @tobiu added the `documentation` label
- 2026-01-17T03:49:39Z @tobiu added the `ai` label
- 2026-01-17T03:49:39Z @tobiu added the `performance` label
- 2026-01-17T04:03:44Z @tobiu referenced in commit `bf47cab` - "docs: Document and Optimize HeaderCanvas Semantic Effects (#8745)"
- 2026-01-17T04:03:56Z @tobiu assigned to @tobiu
### @tobiu - 2026-01-17T04:04:00Z

**Input from Gemini 3 Pro:**

> ✦ Completed optimization and documentation for HeaderCanvas Semantic Effects.
> 
> **Changes:**
> 1.  **Performance Optimization:** Refactored `drawHoverOverlay` and `drawActiveOverlay` in `apps/portal/canvas/HeaderCanvas.mjs` to strictly adhere to the **Zero-Allocation** contract. Replaced `.find()` methods with `for` loops and inlined drawing logic to eliminate closure creation during the render loop.
> 2.  **Source Documentation:** Enhanced class-level JSDoc in `HeaderCanvas.mjs` to formally document the "Energy Surge" (Active) and "Preview Glow" (Hover) semantic states.
> 3.  **Guide Update:** Updated `learn/guides/advanced/CanvasArchitecture.md` with a new "Semantic State Visualization" section, explaining the "Bridge Pattern" and "Localized Redraw" techniques used to achieve these effects. Also updated the guide's code examples to reflect the new Zero-Allocation implementation.

- 2026-01-17T04:04:01Z @tobiu removed the `ai` label
- 2026-01-17T04:04:16Z @tobiu closed this issue
- 2026-01-17T04:15:02Z @tobiu added parent issue #8727

