[Interest] ImageProvider Threading

[md at rpzdesign.com]

Gunnar:

Thanks for the 5.6 doc link.

Could not find anything that talks about parallel loading.  But if you 
say it will provide parallel loading, what does the QML Image { } object 
display while the image is loading?

I may want to return with a standard "Loading image..." image for those 
images that are not found "slowly" in the background.

So what must be done is a way to cause Image { } to get refreshed later 
after they return a temporary image just for speed purposes.

Thanks,

md

On 9/18/2015 12:29 AM, Gunnar Roth wrote:
> Hi Mark,
> I think it is serial. In Qt 5.6 there will be a new
> QQuickAsyncImageProvider
> <http://doc-snapshots.qt.io/qt5-5.6/qquickasyncimageprovider.html> class, with
> it you can do parallel image loading/rendering.
> Regards,
> Gunnar Roth
> *Gesendet:* Freitag, 18. September 2015 um 02:29 Uhr
> *Von:* "mark diener" <rpzrpzrpz at gmail.com>
> *An:* "interest at qt-project.org" <interest at qt-project.org>
> *Betreff:* [Interest] ImageProvider Threading
> Hello List:
> When dealing with multi-threading, the docs say that QQuickImageProvider
> will load
> images in a separate low priority thread.
> As it reads in the docs:
>
> http://doc.qt.io/qt-5/qquickimageprovider.html#details
>
> "When this is enabled, the image request to the provider is run in a low
> priority thread, allowing image loading to be executed in the
> background, and reducing the performance impact on the user interface."
> Does anybody know if the requests are queued in a single low priority
> thread or the requests are made in parallel low priority threads?
> For queued, this means if we take a long time to return from
> requestPixMap( ) that all the other images will block waiting for each
> queued requestPixmap( ) call to complete.
> Who knows, parallel or serial requestPixmap( ) calls?
> Thanks,
> md
>
>
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