** Changed in: qtdeclarative-opensource-src (Ubuntu)
Assignee: (unassigned) => Timo Jyrinki (timo-jyrinki)
** Changed in: qtdeclarative-opensource-src (Ubuntu)
Status: New => In Progress
** Also affects: thumbnailer (Ubuntu)
Importance: Undecided
Status: New
** Changed in: thumbnailer (Ubuntu)
Assignee: (unassigned) => Albert Astals Cid (aacid)
** Branch linked: lp:~aacid/thumbnailer/asyncprovider
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https://bugs.launchpad.net/bugs/1439263
Title:
Backport QQuickAsyncImageProvider from upstream-dev
Status in qtdeclarative-opensource-src package in Ubuntu:
In Progress
Status in thumbnailer package in Ubuntu:
New
Bug description:
In Qt <= 5.5 there is exactly one thread that handles loading of
images that come from custom image providers, this means that if a
given image provider is very slow it will block the rest of image
providers.
Qt 5.6 introduces QQuickAsyncImageProvider that is a job based API
that allows the custom image providers to run threads on their side,
this way they won't block other requests.
By backporting QQuickAsyncImageProvider we can solve
https://bugs.launchpad.net/thumbnailer/+bug/1425043 by making the
thumbnailer have a "slow" thread for thumbnails that it needs to do
and a "fast" one for thumbnails that are already done as shown by the
proof of concept implementation at
https://code.launchpad.net/~aacid/thumbnailer/asyncprovider/+merge/253188
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