feat(canvas): typography API — canvas_text_ex and canvas_measure_text

[niklabh]

Extends the canvas text path with explicit font family, weight (100..=900), style (normal/italic/oblique), and horizontal alignment. Adds synchronous text measurement (width, ascent, descent) backed by GPUI's WindowTextSystem, injected into HostState for the duration of each on_frame call. Ships a typography-demo example showcasing weight and style variants plus a measurement-driven underline.

Existing canvas_text and DrawCommand::Text paths are unchanged.

[coderabbitai]

Warning

Rate limit exceeded

@niklabh has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 29 minutes and 46 seconds before requesting another review.

To keep reviews running without waiting, you can enable usage-based add-on for your organization. This allows additional reviews beyond the hourly cap. Account admins can enable it under billing.

⌛ How to resolve this issue?

After the wait time has elapsed, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9cd02949-1f3a-4d8d-8732-3560f5f68c3f

📥 Commits

Reviewing files that changed from the base of the PR and between 95218a5 and e6fc45b.

⛔ Files ignored due to path filters (5)

• oxide-landing/audio_player.wasm is excluded by !**/*.wasm
• oxide-landing/events_demo.wasm is excluded by !**/*.wasm
• oxide-landing/hello_oxide.wasm is excluded by !**/*.wasm
• oxide-landing/index.wasm is excluded by !**/*.wasm
• oxide-landing/timer_demo.wasm is excluded by !**/*.wasm

📒 Files selected for processing (6)

• Cargo.toml
• examples/typography-demo/Cargo.toml
• examples/typography-demo/src/lib.rs
• oxide-browser/src/capabilities.rs
• oxide-browser/src/ui.rs
• oxide-sdk/src/lib.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/typography-api

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Review rate limit: 0/1 reviews remaining, refill in 29 minutes and 46 seconds.}

_{Comment @coderabbitai help to get the list of available commands and usage tips.}