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Fix some webp images improperly marked as animated (#29713)

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* Fix some webp images improperly marked as animated

* Add unit test for an unanimated webp file in extended file format

* Apply linting to webp test
This commit is contained in:
Peter Smit
2025-04-11 15:32:41 +02:00
committed by GitHub
parent d594441b53
commit ca56c2e091
3 changed files with 9 additions and 2 deletions
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4
src/utils/Image.ts
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@@ -31,13 +31,13 @@ export async function blobIsAnimated(mimeType: string | undefined, blob: Blob):
case "image/webp": {
// Only extended file format WEBP images support animation, so grab the expected data range and verify header.
// Based on https://developers.google.com/speed/webp/docs/riff_container#extended_file_format
const arr = await blob.slice(0, 17).arrayBuffer();
const arr = await blob.slice(0, 21).arrayBuffer();
if (
arrayBufferReadStr(arr, 0, 4) === "RIFF" &&
arrayBufferReadStr(arr, 8, 4) === "WEBP" &&
arrayBufferReadStr(arr, 12, 4) === "VP8X"
) {
const [flags] = arrayBufferRead(arr, 16, 1);
const [flags] = arrayBufferRead(arr, 20, 1);
// Flags: R R I L E X _A_ R (reversed)
const animationFlagMask = 1 << 1;
return (flags & animationFlagMask) != 0;