> -----Original Message----- > From: Interest [mailto:interest-bounces+mitch.curtis=qt...@qt-project.org] > On Behalf Of Shawn Rutledge > Sent: Thursday, 15 March 2018 3:27 PM > To: Shantanu Tushar <shaan...@gmail.com> > Cc: Qt Project MailingList <interest@qt-project.org> > Subject: Re: [Interest] How to render small Images decently on non retina > displays with QtQuick? > > > > On 15 Mar 2018, at 14:20, Shantanu Tushar <shaan...@gmail.com> wrote: > > > > On 6 March 2018 at 22:15, Xavier Bigand <flamaros.xav...@gmail.com> > wrote: > > Hi, > > > > If your sample picture is relevant I can suggest you to convert it as SVG > (vectoring it) or using distance field technique. > > > > I had this question for a while now - if we can use SVGs for showing > application icons (which will then look good with any dimensions / DPI), why > is it common to use images instead? There's obviously some benefit to > images as people take pains to bundle multiple versions for different DPIs, I > wanted to know what they are. Most of the stuff I can find online is always > talking about websites and "web apps" which might not all apply to desktop > applications. > > > > I see that Uwe has pointed out a performance issue which can happen > because of multiple renderings due to size changes. Is that it? Or are there > other reasons behind preferring PNG icons over SVG? > > I think it’s mainly that SVG rendering is slow because it’s done in software, > and also that qtsvg only supports SVG Tiny, so it can’t render everything that > you can design in Inkscape, for example. You have keep the SVGs simple and > avoid features that we don’t support (blurs, gradients, line > endings/arrowheads and lots more). If you want full SVG support you can > use webkit/webengine, but that’s overkill in many applications. > > Speaking of distance field: If your icons are monochrome, you might consider > making a custom icon font for your application. You can start with something > like Font Awesome, edit it to include only the icons you need, and add more > custom-designed icons as necessary. Then you can render an icon with a > Text element. But finding a suitable icon editing program is up to you in > that > case. I did it with FontForge once a couple of years ago.
Or just use Fontello: http://fontello.com/ > In the future I think it will make sense to use PDF for vector icons too (in > color, even). (Some frameworks already can do this.) Then instead of an > icon font, you could have one PDF file with all the icons for your app, one > icon > per “page”. I hope to eventually support using a PDF file with an ordinary > Image in QML, but we have to add API for selecting the page, and there are > other issues with caching and so on. I had patches to get it mostly working a > couple of years ago, it just wasn’t 100% ready for integration. > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
