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https://github.com/heygen-com/hyperframes.git
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Miguel Ángel
700187b855
* fix(core): color grading builds a new WebGL context when a lost one is never restored A context the browser evicts and does not restore left every graded clip hidden for good. After a grace period the runtime now creates a new shared context and moves each clip onto it. * refactor(core): split the lost-context rebuild into smaller steps and test its retry
Hyperframe Runtime Engine
This folder owns the runtime that powers preview and producer parity.
Current Direction
- Runtime source of truth is converging on
hyperframe.ts. - Build produces:
dist/hyperframe.runtime.iife.js(browser bootstrap)dist/hyperframe.runtime.mjs(tooling/tests)dist/hyperframe.manifest.json(version + sha256 + artifact map)
- FE owns iframe runtime injection.
- BE persists raw generated HTML without injecting runtime scripts.
- Producer validates pinned runtime checksum from manifest before render.
Runtime Contract (Stable Surface)
Globals:
window.__playerwindow.__playerReadywindow.__renderReadywindow.__timelineswindow.__clipManifest
postMessage:
- parent -> runtime control:
source: "hf-parent"type: "control"- actions:
play,pause,seek,set-muted,set-playback-rate,enable-pick-mode,disable-pick-mode
- runtime -> parent events:
source: "hf-preview"type: "state"carries the wholeframe, the exactcurrentTimein seconds andended, true once the clock has reached the film's end; a parent ends the film onendedrather than comparing times, and a pause on the last frame stays a pausetype: "timeline"carriesassetsReady(whether the composition's media, images and fonts have settled) and the runtime then poststype: "assets-ready"once, so a parent that cannot read the iframe can gate playbacktype: "ready"— emitted once wheninstallRuntimeControlBridgeregisters the control-message listener. The parent uses it to replay current playback state (set-muted,set-volume,set-playback-rate) so any control message sent before the listener was installed isn't lost. Emitted again on every iframe reload because the new runtime instance starts with no state.
Determinism baseline:
renderSeekis the producer-canonical seek path.- 30fps quantization and readiness gates are correctness requirements.
- Preview automation uses
?hf-capture=1,hyperframes snapshot, or runtime readiness (window.__renderReadyand the seek contract), never a wait on all ofdocument.images. Interactive preview leaves images in hidden future clips unloaded until they are needed.
Runtime-loaded compositions finalize IDs already used by native SVG references before scene
scripts run. IDs used only by JavaScript keep their authored values. If an initial script
introduces an ID's first native url() or href reference, that ID can be renamed after
initial scripts finish. A string captured before that first native use is not guaranteed
stable; read the target element's current id after runtime readiness for deferred writes.
Attribute selectors with a declared namespace prefix (@namespace xl url(...) plus
[xl|href="#id"]) follow renamed references through the live CSSOM before scene scripts run,
in runtime and compiled output alike. Compiled CSS text leaves them as authored, so these
selectors need JavaScript; with scripts disabled they match only unrenamed values.
Build
bun run --filter @hyperframes/core build:hyperframes-runtime
Security Expectations
- Runtime bootstrap URL must be version-pinned and host-allowlisted.
- Iframe bridge payloads must be schema-validated.
- Unsafe URL schemes (
javascript:and unapproveddata:) are rejected. - Fail closed if runtime bootstrap/handshake is not healthy.
Product Editing Model
- Primary mode: prompt + element picking.
- Secondary mode: manual precision controls.
- Avoid timeline-first manual workflows as default product path.