Hi Vlad, you mean the QQuickAsyncImageProvider? That one sounds really promising. Will definitely try that out. Many thanks for the suggestion!
Bernhard Am Donnerstag, 10. August 2017 schrieb Vlad Stelmahovsky : > threaded image provider might help > > On Thu, Aug 10, 2017 at 12:36 PM, Bernhard B <schluc...@gmail.com > <javascript:_e(%7B%7D,'cvml','schluc...@gmail.com');>> wrote: > >> Hi, >> >> yesterday, I also tried to replace the Base64ImageProvider approach with >> a subclassed QQuickPaintedItem which paints the image in it's paint method. >> I imagined that this approach might be faster es no bade64 decoding needs >> to be done. But unfortunately it looks like as it's performing even worse >> that way. >> >> Bernhard >> >> Am Mittwoch, 9. August 2017 schrieb Bernhard B : >> >>> Hi, >>> >>> I would need some help from you guys on how to improve the ListView's >>> performance. The problem is, that scrolling through my ListView sometimes >>> feels a little bit sluggish. >>> >>> If I only display some text in the ListView's delegate I can scroll >>> smoothly through my list. But as soon as there is a picture in the >>> ListView's delegate I notice that I can't scroll smoothly through my list >>> anymore. That's especially noticable if I try to scroll fast through my >>> list. Every time I hit a picture while scrolling through the list I can see >>> that there is a noticable delay until the picture is fully loaded. My >>> assumption is, that those pictures are the reason why he scrolling feels so >>> sluggish. >>> >>> My application currently works like this: >>> >>> * load 20 pictures via REST (pictures are base64 encoded) >>> * populate list model >>> * the Image component in the delegate uses a Base64ImageProvider (self >>> written) to access the model's base64 encoded content and displays the image >>> * if the user scrolls past a threshold another batch of base64 encoded >>> pictures is fetched from the server >>> >>> I also found this document: http://doc.qt.io/qt- >>> 5/qtquick-performance.html#rendering and tried to apply as much as >>> possible. In detail I applied the following changes: >>> >>> * removed complex bindings from delegate >>> * set sourceSize property for Image >>> * increased cacheBuffer a bit >>> * profiled with QML profiler and improved a few things >>> >>> But still, the ListView feels a bit sluggish. The strange thing is, that >>> it's most noticable on Android whereas on Windows and iOs it is better. >>> >>> Does anyone have an idea on how to improve that? >>> >>> >>> Any help is really appreciated. >>> Thanks a lot! >>> >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> <javascript:_e(%7B%7D,'cvml','Interest@qt-project.org');> >> http://lists.qt-project.org/mailman/listinfo/interest >> >> > > > -- > Best regards, > Vlad >
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