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Vance IngallsandClaude Sonnet 5.5 536346c5d1 feat(core): block capture motion blur on html-in-canvas defects (#5971)
html-in-canvas captures a few things wrongly, and a wrong blurred frame is
worse than a sharp one. Add a defect list the runtime checks before it wraps
a composition: a WebGL or WebGPU canvas (captured frozen), backface-hidden
faces in a 3D context (drawn mirrored), an iframe (reloaded by the wrap and
not recoverable), a transform or opacity below 1 on the root (ignored by the
capture) and a canvas that is already a capture canvas (nesting hangs the
renderer). Any hit turns blur off for the whole composition and the runtime
says which one.

The backface scan reads rules nested inside a style rule (CSS nesting),
sheets pulled in with @import and adopted style sheets. Shadow DOM stays a
documented limit.

A face whose backface-visibility: hidden arrives through an animation counts
too: the scan also takes the elements of running CSS or WAAPI animations that
key it, and elements naming a @keyframes rule that does, as candidates.

Support Chrome 157's html-in-canvas API alongside the older one: a canvas
marked content="drawable" with a drawable attribute on captured children
replaces layoutsubtree. Blur, the VFX runtime and Studio's browser check
detect both through the new @hyperframes/core/html-in-canvas subpath.

Folded review fixes: R14, R9 (the iframe defect entry).

Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-10-21 15:02:16 -07:00
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