W3C home > Mailing lists > Public > whatwg@whatwg.org > December 2013

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

From: Robert O'Callahan <robert@ocallahan.org>
Date: Wed, 18 Dec 2013 23:29:17 +1300
Message-ID: <CAOp6jLZ1cG2WQYHeT5oaoZJ0tncaNNgWa2k_9QLnrR84QBBGSQ@mail.gmail.com>
To: David Flanagan <dflanagan@mozilla.com>
Cc: "whatwg@whatwg.org" <whatwg@whatwg.org>, Rik Cabanier <cabanier@gmail.com>
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.

Jtehsauts  tshaei dS,o n" Wohfy  Mdaon  yhoaus  eanuttehrotraiitny  eovni
le atrhtohu gthot sf oirng iyvoeu rs ihnesa.r"t sS?o  Whhei csha iids  teoa
stiheer :p atroa lsyazye,d  'mYaonu,r  "sGients  uapr,e  tfaokreg iyvoeunr,
'm aotr  atnod  sgaoy ,h o'mGee.t"  uTph eann dt hwea lmka'n?  gBoutt  uIp
waanndt  wyeonut  thoo mken.o w
Received on Wednesday, 18 December 2013 10:29:43 UTC

This archive was generated by hypermail 2.4.0 : Wednesday, 22 January 2020 17:00:15 UTC