Review Request 108434: [High-dpi issues] Fix icon in KPageDialog that shows up in every KCM being hardcoded to 22px

[Kai Uwe Broulik]

> On Jan. 16, 2013, 10:01 a.m., Thomas Lübking wrote:
> > instead of maintoolbar (which could be 128px on even a netbook) maybe relate it to the font height? (what seems to be the idea behind 22px)
> 
> Kai Uwe Broulik wrote:
>     Main toolbar icon size is only settable from 16 to 48 pixels and defaults to 22. And if you increase the size of toolbar icons, it will make the look somewhat unified, if this icon grows as well. Don't know how I can properly relate it to the font height, especially since I cannot just use an arbitrary number but one of these: 16, 22, 32, 48, ..
> 
> Thomas Lübking wrote:
>     > Main toolbar icon size is only settable from 16 to 48 pixels and defaults to 22.
>     Arbtrary GUI config limitation:
>     kwriteconfig --file kdeglobals --group MainToolbarIcons --key Size 128
>     
>     > And if you increase the size of toolbar icons, it will make the look somewhat unified
>     As mentioned, i don't know about the idea behind this, just pointing that a fixed size usually near the font height was initially picked.
>     If you raise dpi, thus font pixels ... you get what i mean.
>     
>     > Don't know how I can properly relate it to the font height
>     QFontMetrics(QWidget::font()).height()
>     
>     QPixmap QIcon::pixmap ( int w, int h, Mode mode = Normal, State state = Off ) const
>     This is an overloaded function.
>     Returns a pixmap of size QSize(w, h). The pixmap might be smaller than requested, but never larger.
>     
>     You /can/ use arbitrary sizes but may want to match them to the closest size (simple for the 2^n sizes, but there's still stupid 22px - as it's apparently not a hot path, just move up until qAbs(height-n) gets bigger again)
> 
> Kai Uwe Broulik wrote:
>     > Arbtrary GUI config limitation:
>     But not my problem if a user bypasses this :P
>     
>     > QFontMetrics(QWidget::font()).height()
>     Thanks! Ah, this is how to use this. Already knew that there was this QFontMetrics thing but didn't know how to use. Will make my work on other parts easier as well.
>     
>     > You /can/ use arbitrary sizes but may want to match them to the closest size
>     Yes, I know, but wanted to point out that I didn't want this to avoid blurry icons ;)
>     
>     I don't understand this 22 thing anyway, why not just 24? Who knows..
> 
> Thomas Lübking wrote:
>     > But not my problem if a user bypasses this :P
>     This will fail as soon as the GUI is modified to reflect the requirements of HiRes screens, isn't?
>     
>     > Yes, I know, but wanted to point out that I didn't want this to avoid blurry icons ;)
>     I'm at hand not sure, but believe that QIcon will get you a correct (unscaled) pixmap of the next lower size (so 21,21 will get you 16,16) - yesno?
>     
>     > I don't understand this 22 thing anyway, why not just 24? Who knows..
>     because 24 is 2^4+2^3?
>     22 is 2^4+2^2+2^1 - equally good :-P
>     
>     Historical reasons, i think.
> 
> Kai Uwe Broulik wrote:
>     Tried it with QFontMetrics but doesn't look nice and is less predictable than MainToolBar icon size.
> 
> Thomas Lübking wrote:
>     What do you mean "doesn't look nice"?
>     On a common setup this should result in a 22px icon - the same you use now (for the configured toolbar size)
> 
> Christoph Feck wrote:
>     Regarding 22 vs. 24, the geometric mean of 16 and 32 is 22.63, which got rounded down to 22 to get even sized icons. For the newer (larger) icon sizes, a simple "multiple of 16" rule was used instead, because nobody knew the old rule :)
> 
> Kai Uwe Broulik wrote:
>     @Thomas: But on my machine (125dpi) it also results in a 22px icon which looks weird and was the initial reason for this patch.
>     
>     @Christoph: Thanks for the history lesson :-) So let's ditch 48px icons in favor of 45px ;)
> 
> Thomas Lübking wrote:
>     Depends on the implementation.
>     22/72*125 = 38.1944 - what is indeed closer to 32 than 48px - but not 22px
>     even if one assumed the 22px were chosen for 96 dpi you'd be at 28.6458px (thus closer to 32 than 22)
>     
>     The "problem" of my original suggestion is that the targetsize was unlikely ever QFontMetrics(QWidget::font()).height() - because even on a 96dpi display a relatively huge 12pt font would be only 16px high... so the idea was "font height + "some padding" - or maybe just "*1.618"

Btw it doesn't matter which size is closer, docs say:
"Returns a pixmap with the requested size […]. The pixmap might be smaller than requested, but never larger."


- Kai Uwe


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On Jan. 16, 2013, 1:34 a.m., Kai Uwe Broulik wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> http://git.reviewboard.kde.org/r/108434/
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> 
> (Updated Jan. 16, 2013, 1:34 a.m.)
> 
> 
> Review request for kdelibs.
> 
> 
> Description
> -------
> 
> It took me hours (really, it's like. System Settings adds a KCModuleProxy which calls KCModuleLoader to load a KCModule which is in some different directory which uses KPageDialog (where I looked at first …) which uses KPageWidget which is a private class inside which then uses KPageView bla.. :D)
> 
> Finally got it and made it use the MainToolbar size which also defaults to 22px, so you won't notice any difference, but users of MacBook Pro Retina and similar devices will appreciate. Also makes it unified a bit because it is always the toolbar icon size.
> 
> 
> Diffs
> -----
> 
>   kdeui/paged/kpageview.cpp 8863934 
> 
> Diff: http://git.reviewboard.kde.org/r/108434/diff/
> 
> 
> Testing
> -------
> 
> Yup, see screenshots.
> 
> Only minor problem is that it doesn't react to when the icon size changes (like buttons and other elements do).
> 
> 
> File Attachments
> ----------------
> 
> KPageDialog icon adapted
>   http://git.reviewboard.kde.org/media/uploaded/files/2013/01/16/iconding.png
> 
> 
> Thanks,
> 
> Kai Uwe Broulik
> 
>

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