Possible QFontDatabase missing feature

[geometer]

@raven-worx Unfortunately, it does not depend. If I load both, it uses Light not depending on 'bold' attribute is set, or on the loading order. Qt 5.10, MacOS 10.13.3.

On the other hand, even I do as you describe, this is not a complete solution. CSS file defines own family name and style and there is no guarantee that it would be the same as defined in the font file. In the sample file, there is the definition that changes the family name; I'm afraid they could change the styles as well.

@font-face {
    font-family: 'QuicksandLight';
    src: url('../fonts/Quicksand_Light.otf') format('truetype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'QuicksandLight';
    src: url('../fonts/Quicksand_Bold_Oblique.otf') format('truetype');
    font-weight: bold;
    font-style: normal;
}

[geometer]

Heh, it seems like the sample file is the sample of CSS-changed attributes too. "Bold Oblique" means "bold AND italic", but the CSS defines "just bold". And this is why my code does not work. This is not a Qt bug, QFont("QuickSand", .., true, true) loads bold oblique version.

However, there is no way for me to know which font style was loaded, is it?

[raven-worx]

@geometer said in Possible QFontDatabase missing feature:

However, there is no way for me to know which font style was loaded, is it?

not that i am aware of.
As you can see the different font faces can be loaded combined in a single file or in separate files.

What are you trying to achieve exactly?
You want to display the contents of the epub using Qt widgets, right?
Are you parsing all the information from the HTML files?

(nvm i think i figured it out myself)

[sierdzio]

A wild and most probably wrong thought: can you select proper font using font foundry perhaps?

QFont myFont("Quicksand [Light]");

Maybe that info can be extracted from the otf file.

[geometer]

@sierdzio said in Possible QFontDatabase missing feature:

QFont myFont("Quicksand [Light]");

Sorry, not sure I understand. I can access both loaded fonts, one as QFont("Quicksand", size, false, false), the second one as QFont("Quicksand", size, true, true). The problem is that I need to access exactly "the font loaded according the CSS specification". How do I know that the font loaded for

@font-face {
    font-family: 'QuicksandLight';
    src: url('../fonts/Quicksand_Bold_Oblique.otf') format('truetype');
    font-weight: bold;
    font-style: normal;
}

from the file "Quicksand_Bold_Oblique.otf" is bold and italic? I can know that its family name on Qt level is "Quicksand", via

QFontDatabase::applicationFontFamilies(fontId)

call, that's fine. But how do I take its style?

[sierdzio]

Ah, ok, I understood this the other way around :-) So the font is being loaded by some CSS parser and thus you don't have direct access to that info? You've mentioned you are loading it yourself... so I'm a bit confused. If you are loading yourself and you have all the info mentioned in the CSS snippet, then it should be possible to extract all the details, even if it means parsing the CSS manually. Sure, it would have been better if Qt extended font ID functionality, you can open a feature request for that or contribute yourself if you feel like it.

[geometer]

Thank you. Yes, we parse CSS manually.

Where do I open a feature request?

[sierdzio]

In Qt bug tracker: https://bugreports.qt.io/secure/Dashboard.jspa

[geometer]

Thanks, done: https://bugreports.qt.io/browse/QTBUG-66382

[raven-worx]

@geometer
anyway, since waiting to your feature request to be implemented will most probably take some time, you are welcome to make the change yourself and contribute it to Qt source ;)