983051 - Decode on draw sometimes decode too early

Status: NEW

(Core :: Graphics: ImageLib, defect, P3)

Description

[Kan-Ru Chen [:kanru] (UTC+9)]

+++ This bug was initially created as a clone of Bug #945161 +++

Even image.mem.decodeondraw is true we sometimes still decode the full image when all data is available. It happens when the image is in cache and downloads very fast.

Comment 1

[Timothy Nikkel (:tnikkel)]

What causes the full decode?

Comment 2

[Kan-Ru Chen [:kanru] (UTC+9)]

(In reply to Timothy Nikkel (:tn) from comment #1)
> What causes the full decode?

I'm not sure. I could be wrong. There seems so many way to trigger decode but some look suspicious. For example this one:

 http://hg.mozilla.org/mozilla-central/file/46041cc216fd/image/src/RasterImage.cpp#l1663

And this one:

 http://hg.mozilla.org/mozilla-central/file/46041cc216fd/image/src/RasterImage.cpp#l1739

For bug 945161 we want to get the layout information before we fully decode the image. But sometimes I couldn't get the frame size before we start decoding.

Comment 3

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 1 year(s).
See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information