[Interest] Mac with Retina Display - Look is "Pixilated" with Qt-5.4.2

Robert Iakobashvili coroberti at gmail.com
Sun Jul 26 12:04:52 CEST 2015


On Fri, Jul 24, 2015 at 4:48 PM, Robert Iakobashvili
<coroberti at gmail.com> wrote:
> On Fri, Jul 24, 2015 at 2:36 PM, Till Oliver Knoll
> <till.oliver.knoll at gmail.com> wrote:
>>> Am 22.07.2015 um 08:43 schrieb Robert Iakobashvili <coroberti at gmail.com>:
>>> On Wed, Jul 22, 2015 at 9:16 AM, Hamish Moffatt
>>> <hamish at risingsoftware.com> wrote:
>>>> On 22/07/15 15:52, Robert Iakobashvili wrote:
>>>>> Gentlemen,
>>>>> A user pointed to the issue on
>>>>> Mac Book Pro 15 inch mid 2015. AMD Radeon R9 graphic card,
>>>>> 15.4-inch, 2880 x 1800 screen, Mac OS 10.10.4.
>>>>> and mentioned that the look is "pixelated as the application
>>>>> does not support Retina".
>>>>> Unfortunately, I do not have such expensive HW to
>>>>> reproduce the issue.
>>>>> A patch to support 2x and 3x images
>>>>> from Morten Sorvig has been applied
>>>>> and images 2x and 3x are inside:
>>>>> https://codereview.qt-project.org/106717
>>>>> https://codereview.qt-project.org/106705
>>>>> Is there something else to be done with Qt-5.4.2
>>>>> like defining some HIGH-DPI, etc?
>>>> You need to add two keys to your Info.plist:
>>>> a boolean key NSHighResolutionCapable with value TRUE;
>>>> a string key NSPrincipalClass with value NSApplication.
>>>> Hamish
>>> Dear Hamish,
>>> I'll try it.
>> Besides, you don't necessarily need Retina capable hardware: the "Quartz Debug Extensions" ((?) check optional developer downloads, either in Xcode or, more likely, on Apple's developer homepage) allow you to run your desktop in "Retina mode" to test your application.
>> Cheers,
>>   Oliver
> Dear Oliver,
> Quarts is very very useful.

It's a QWidget-based application.

After adding to Info.plist


on a good side all texts and fonts are looking great in the created by
Quartz Debug
HDPI Display with double resolution.

However, on a bad site I do not see any improvements in how images are looking.

All images are located in resource file with appropriate @2x for
double resolution
images and they are used for QIcon constructor by passing their rsc locations.

qApp->devicePixelRatio() was checked to be 2.0

The look of images is not changes/improves even if the names of
the 2x images are passed explicitly. They are loaded, but still not looking
differently from 1x.

Am I missing something about Quartz settings or capabilities?


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