[Interest] iOS retina @3x

[Robert Iakobashvili]

On Wed, Aug 19, 2015 at 11:08 AM, maitai <maitai at virtual-winds.org> wrote:
> Hello,
>
> I am in the process of upgrading our icons to accommodate retina
> display, especially on iOS.
>
> For this purpose, I have created artwork at different sizes, for
> instance
>
> arrow_left.png (32x32)
> arrow_left at 2x.png (64x64)
> arrow_left at 3x.png (96x96)
>
> I changed the color of each image in order to see which one is actualy
> loaded, and I do have
> QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
>
> then I just use QIcon myIcon("arrow_left.png");
>
> When I run this on iPhone 6 emulator, I can see that the @2x is loaded
> as expected, very nice. But when I do the same on iPhone 6+ emulator,
> the @2x is loaded too, where I was expecting the @3x version to be
> used... The system reports 3 for devicePixelRatio as expected, but still
> qt is choosing the 2x version.
>
> So the question is: @3x is also supported for QIcon in qt 5.5.0/iOS or
> it should work and I am doing something wrong?
>
> Thanks
> Philippe Lelong

Dear Phillippe,
Welcome to the club.

Doing that with the patch from Morten Sorvig applied for 5.4:
https://codereview.qt-project.org/106717

is working for me at a real device (6+) as well as at emulator
for a QWidget-based app.

I'm not trying 5.5 till 5.5.1

Hope this helps.

Regards,
Robert