Decide the html-in-canvas defects once for the whole timeline instead of at
the frame being drawn. The mover scan already seeks the timeline, so the
defect scan samples along it and a defect that only appears mid-timeline (a
rotated root, a flipped card) turns blur off from frame 0. Defects now block
on every Chrome version, so a render matches the preview it came from, and
GSAP's identity transform on the root no longer counts as one.
A per-frame check stays as a backstop for what scripts add later, and it
costs only that frame: a defect the scan missed (a short root shake, a
backface flip between samples) renders that frame sharp and logs once, and
blur resumes when the defect is gone. A block raised by the scan is lifted
when its cause is removed or the timeline changes; a capture failure stays
for the life of the instance.
The candidates a scan checks include faces whose backface-visibility: hidden
arrives through an animation. Each rescan adds to them and the per-frame
backstop reads the same set, so an animated-only flip card is caught by both.
Look for WebGL canvases in the whole document: a render's shader-transition
compositor appends its canvas to body, while preview puts it inside the root.
Turn page blur off on routes that cannot host it. The HDR and layered
compositors screenshot each DOM layer after hiding the others, which does
not reach blur's canvases, and a distributed (cloud or Lambda) chunk render
has no Studio preview to match and no guarantee of html-in-canvas in the
worker's Chrome. The producer sets pageMotionBlur to hdr-render,
layered-composite or distributed-render there, the distributed plan's
compile-time hint no longer forces screenshot capture, and the runtime says
which route turned it off.
Find the same movers whatever time a scan starts: the baseline is read at
t=0, so each worker of a parallel render picks the same set. An ancestor's
pan is not counted as its child's move.
Folded review fixes: R5, R10, R15, R19.
Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
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>
