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fix(engine): preserve video frame replacement geometry (#838)

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* fix(engine): preserve video frame replacement geometry

* test(producer): cover video overlay stretch regression

* fix(engine): always pass clip to Page.captureScreenshot

Without an explicit clip, Chrome can resolve replaced-element sizing
differently at dpr=1 when full-bleed absolute videos interact with
overlay layers — producing anisotropic frame stretching on some
compositor paths. Always passing clip with scale=dpr (including 1)
ensures geometry is locked to the measured viewport dimensions.

Credit: brian-t-allen (#837)

* test(producer): regenerate style-9-prod baseline for always-clip capture path

The always-clip change in screenshotService.ts routes Chrome through a
different compositor capture path at dpr=1, producing different video
frame compression artifacts. Regenerated inside Dockerfile.test to match
CI environment.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Miguel Ángel
2026-05-15 18:58:50 +02:00
committed by GitHub
co-authored by Claude Opus 4.6
parent 952d2658b0
commit 8e0cfc33a7
10 changed files with 1451 additions and 730 deletions
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packages/engine/src/services/screenshotService.ts
+36 -32
View File
@@ -130,19 +130,14 @@ export async function pageScreenshotCapture(page: Page, options: CaptureOptions)
const client = await getCdpSession(page);
const isPng = options.format === "png";
const dpr = options.deviceScaleFactor ?? 1;
// When supersampling, pass an explicit clip with `scale` so Chrome emits a
// screenshot at device-pixel dimensions (`width × height × dpr`). Without
// this, `Page.captureScreenshot` returns at CSS dimensions regardless of
// the viewport's deviceScaleFactor.
const clip =
dpr > 1 ? { x: 0, y: 0, width: options.width, height: options.height, scale: dpr } : undefined;
const clip = { x: 0, y: 0, width: options.width, height: options.height, scale: dpr };
const result = await client.send("Page.captureScreenshot", {
format: isPng ? "png" : "jpeg",
quality: isPng ? undefined : (options.quality ?? 80),
fromSurface: true,
captureBeyondViewport: false,
optimizeForSpeed: !isPng,
...(clip ? { clip } : {}),
clip,
});
return Buffer.from(result.data, "base64");
}
@@ -382,6 +377,15 @@ export async function injectVideoFramesBatch(
await page.evaluate(
async (items: Array<{ videoId: string; dataUri: string }>, visualProperties: string[]) => {
const pendingDecodes: Array<Promise<void>> = [];
const replacementLayoutProperties = new Set([
"width",
"height",
"top",
"left",
"right",
"bottom",
"inset",
]);
for (const item of items) {
const video = document.getElementById(item.videoId) as HTMLVideoElement | null;
if (!video) continue;
@@ -395,7 +399,6 @@ export async function injectVideoFramesBatch(
// and accurately reflects the user's intent on every frame.
const opacityParsed = parseFloat(computedStyle.opacity);
const computedOpacity = Number.isNaN(opacityParsed) ? 1 : opacityParsed;
const sourceIsStatic = !computedStyle.position || computedStyle.position === "static";
if (isNewImage) {
img = document.createElement("img");
@@ -406,10 +409,35 @@ export async function injectVideoFramesBatch(
}
if (!img) continue;
for (const property of visualProperties) {
// Opacity is handled explicitly via `computedOpacity` below — copying
// via the generic loop would race against the opacity:0 hide applied
// to the <video> at the end of this function. GSAP may animate
// opacity either on a wrapper (the <img> inherits via the stacking
// context) or directly on the <video> (we must copy it to the <img>
// since they are siblings). Reading computedStyle.opacity before
// hiding the <video> handles both cases correctly.
if (property === "opacity") continue;
// Layout is set from the video's used box below. Copying authored
// opposing constraints such as `inset: 0` / `right: 0` onto the
// replacement <img> can overconstrain replaced-image sizing and make
// some Chrome capture paths resample the frame anisotropically.
if (replacementLayoutProperties.has(property)) {
continue;
}
const value = computedStyle.getPropertyValue(property);
if (value) {
img.style.setProperty(property, value);
}
}
// Always use absolute positioning so the <img> overlays the <video>
// instead of flowing below it. With position:relative, both elements
// stack vertically — the <img> lands below the video and gets clipped
// by any overflow:hidden ancestor (e.g., border-radius wrappers).
//
// Apply this after visual style copying so the measured used box is
// the final authority for replacement frame geometry.
{
const videoRect = video.getBoundingClientRect();
const offsetLeft = Number.isFinite(video.offsetLeft) ? video.offsetLeft : 0;
@@ -429,30 +457,6 @@ export async function injectVideoFramesBatch(
img.style.objectPosition = computedStyle.objectPosition;
img.style.zIndex = computedStyle.zIndex;
for (const property of visualProperties) {
// Opacity is handled explicitly via `computedOpacity` below — copying
// via the generic loop would race against the opacity:0 hide applied
// to the <video> at the end of this function. GSAP may animate
// opacity either on a wrapper (the <img> inherits via the stacking
// context) or directly on the <video> (we must copy it to the <img>
// since they are siblings). Reading computedStyle.opacity before
// hiding the <video> handles both cases correctly.
if (property === "opacity") continue;
if (
sourceIsStatic &&
(property === "top" ||
property === "left" ||
property === "right" ||
property === "bottom" ||
property === "inset")
) {
continue;
}
const value = computedStyle.getPropertyValue(property);
if (value) {
img.style.setProperty(property, value);
}
}
img.decoding = "sync";
if (img.getAttribute("src") !== item.dataUri) {
img.src = item.dataUri;