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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/runtime/entry.ts
+10
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@@ -1,13 +1,23 @@
import { initSandboxRuntimeModular } from "./init";
import { fitTextFontSize } from "../text/fitTextFontSize";
type HyperframeWindow = Window & {
__hyperframeRuntimeBootstrapped?: boolean;
__hyperframes?: {
fitTextFontSize: typeof fitTextFontSize;
};
};
// Inline composition scripts can run before DOMContentLoaded.
// Ensure timeline registry exists at script evaluation time.
(window as HyperframeWindow).__timelines = (window as HyperframeWindow).__timelines || {};
// Expose text utilities immediately so composition scripts can use them
// before DOMContentLoaded (font sizing runs during script evaluation).
(window as HyperframeWindow).__hyperframes = {
fitTextFontSize,
};
function bootstrapHyperframeRuntime(): void {
const win = window as HyperframeWindow;
if (win.__hyperframeRuntimeBootstrapped) {