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feat(core): add fitTextFontSize utility for pixel-accurate text measurement (#152)

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Add @chenglou/pretext dependency and fitTextFontSize() utility that uses
canvas measureText to compute the largest font size that fits text within
a given width. Replaces character-count heuristics with actual font-aware
measurement.

- New fitTextFontSize() in @hyperframes/core/text, exposed on window.__hyperframes
- Generalized for all text elements (captions, titles, etc.), not just captions
- Unit tests (mocked pretext) + browser integration test (real Chromium canvas)
- Updated captions skill docs with usage, exit guarantee, and self-lint patterns

Co-authored-by: James <james.russo@heygen.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Vance Ingalls
2026-03-30 20:14:13 -07:00
committed by GitHub
co-authored by James Claude Opus 4.6
parent dac304ed9f
commit ef6225da1d
12 changed files with 781 additions and 32 deletions
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packages/core/src/index.ts
+4
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@@ -154,3 +154,7 @@ export type {
export type { FrameAdapter, FrameAdapterContext } from "./adapters/types";
export type { GSAPTimelineLike, CreateGSAPFrameAdapterOptions } from "./adapters/gsap";
export { createGSAPFrameAdapter } from "./adapters/gsap";
// Text measurement
export { fitTextFontSize } from "./text/index.js";
export type { FitTextOptions, FitTextResult } from "./text/index.js";