[whatwg] Proposal: downsample while decoding image blobs in createImageBitmap()

[Robert O'Callahan]

Yes. Especially on these devices, JPEG decoding is undue latency.

Also, Rik's suggestion makes an ImageBitmap just a thin wrapper around a
Blob, with decoding performed every time we do a drawImage call. That's bad
for performance in many cases. David's proposal lets the author be a little
bit more explicit and the UA doesn't have to guess what to do.

Rob
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