[Interest] Fonts not rendering!
Lata Agrawal
lata.agrawal at enrouteinc.com
Thu Jun 28 05:40:24 CEST 2012
Thanks Atlant for the time and info you have provided here. I will follow
what you have recommended and hopefully be able to solve the problem.
Thanks again and best regards,
Lata
On 28 June 2012 00:33, Atlant Schmidt <aschmidt at dekaresearch.com> wrote:
> Lata:
>
> ****
>
> Desktop > grep -i 'q[sp]f' QScrollLabelLog.txt****
>
> stat64("/tmp/qtembedded-0//fonts/dejavu_sans_12_75.qsf",
> {st_mode=S_IFREG|0644, st_size=17284, ...}) = 0****
>
> stat64("/tmp/qtembedded-0//fonts/dejavu_sans_12_50.qsf",
> {st_mode=S_IFREG|0644, st_size=18600, ...}) = 0****
>
> unlink("/tmp/qtembedded-0//fonts/dejavu_sans_12_50.qsf") = 0****
>
> unlink("/tmp/qtembedded-0//fonts/dejavu_sans_12_75.qsf") = 0****
>
> ** **
>
> access("/tmp/qtembedded-0//fonts/dejavu_sans_12_50.qsf", F_OK) = -1
> ENOENT (No such file or directory)****
>
> open( "/tmp/qtembedded-0//fonts/dejavu_sans_12_50.qsf",
> O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0644) = 13****
>
> write( 13, "QPF2\0\0\0\0\2\0\0\324\0\0\0\vDejaVu Sans\0\1\0H/"..., 16596)
> = 16596****
>
> ** **
>
> access("/tmp/qtembedded-0//fonts/dejavu_sans_12_75.qsf", F_OK) = -1
> ENOENT (No such file or directory)****
>
> open( "/tmp/qtembedded-0//fonts/dejavu_sans_12_75.qsf",
> O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0644) = 14****
>
> write( 14, "QPF2\0\0\0\0\2\0\0\330\0\0\0\vDejaVu Sans\0\1\0M/"..., 16588)
> = 16588****
>
> ** **
>
> In general, this looks like the right stuff is going on. It indicates
> that Qt has opened the temporary cache file (.qsf in this case)
> for the Déjà vu sans-serif font in the 12 point size for both
> the regular (‘50’) and bold (‘75’) weights.****
>
>
> It wrote quite a bit of data to each file so probably all the
> correct header stuff and **MAYBE** the rendering of the
> first few glyphs.****
>
> ** **
>
> I’m not sure where you should go next, but maybe it’s time
> to consider whether things like text color and transparency are
> correct (so that you’d actually be able to see the text drawn on
> the buttons).****
>
> ** **
>
> It **IS** possible, by the way, to decode what’s in one of these
> .QPF/.qsf files. I have a Perl script that does this but I’m afraid my
> management wouldn’t agree to share it, but I know you could do the
> same reverse-engineering that I did. Try dumping the file with a variety
> of printout widths and you should eventually see the bitmaps of your
> rendered characters****
>
> ** **
>
> Note that the character bitmaps are stored in the .QPF/.qsf file only
> once and in the exact same order as they were first used by you, so
> if your button contained the text “Hello, world from Atlant!”, the
> glyphs in the file would be in the following order:****
>
> ** **
>
> Helo,wrdfmAtlan!****
>
> ** **
>
> In the file, the glyphs vary in width depending on the font metrics
> but they are always an even (or even multiple of 4?) in width.****
>
> ** **
>
> Atlant****
>
> ** **
>
> ** **
>
> *From:* Lata Agrawal [mailto:lata.agrawal at enrouteinc.com]
> *Sent:* Wednesday, June 27, 2012 2:09 PM
> *To:* Atlant Schmidt
> *Cc:* Konstantin Tokarev; interest at qt-project.org
>
> *Subject:* Re: [Interest] Fonts not rendering!****
>
> ** **
>
> Atlant, Thanks for replying.
>
> I checked strace according to which .qpf files are created at
> /tmp/qtembedded-0//fonts on my device. Qt app is also able to access the
> temporarily created font files.
> Can you please go through the strace (attached here) and suggest whats
> possibly gone wrong?
>
> Regards,
> Lata****
>
> On 27 June 2012 21:15, Atlant Schmidt <aschmidt at dekaresearch.com> wrote:
>
> ****
>
> Lata:****
>
> ****
>
> When your app is running, Qt should produce temporary .qpf files
> in your system’s fonts folder (for example,
> /usr/lib/fonts/helvetica_100_50.qpf).
> These represent a cache of glyphs that Qt has already rendered from
> the scalable font file. (In the case of my example, the Helvetica font
> rendered at 10.0 points, normal weight.)****
>
> ****
>
> See if these files are there; that may give you some clue as to how
> far font processing got.****
>
> ****
>
> Atlant****
>
> ****
>
> ****
>
> *From:* interest-bounces+aschmidt=dekaresearch.com at qt-project.org [mailto:
> interest-bounces+aschmidt=dekaresearch.com at qt-project.org] *On Behalf Of *Lata
> Agrawal
> *Sent:* Wednesday, June 27, 2012 11:12 AM
> *To:* Konstantin Tokarev
> *Cc:* interest at qt-project.org
> *Subject:* Re: [Interest] Fonts not rendering!****
>
> ****
>
> In configure command for QT, I have used -qt-freetype. That should build
> freetype support, right?****
>
> On 27 June 2012 20:38, Konstantin Tokarev <annulen at yandex.ru> wrote:****
>
>
> 27.06.2012, 19:06, "Lata Agrawal" <lata.agrawal at enrouteinc.com>:****
>
> > Hi,
> >
> > I am working with an Embedded Linux/MIPS device. It has qt-4.6.2 libs
> compiled using gcc-4.2.4 installed on it. LD_LIBRARY_PATH is set
> appropriately.
> >
> > I tried running a simple QT app with a button on device. The app runs
> fine but the text on button is not showing. I also executed the same app
> with strace (log attached here). In strace log, app appears to find the
> fonts in <QTDIR>/lib/fonts folder but still it is not rendering the text.
> > When I execute the same app on similar device having Qt-4.6.2 libs
> compiled using gcc-3.4.4, it shows the text properly.
> >
> > Can someone please check the strace and help me find out the reason for
> fonts not rendering?****
>
> Do you build Qt with freetype? If not, you need fonts to be rasterized to
> qpf2 format.
>
> --
> Regards,
> Konstantin****
>
>
>
>
> --
> *
> *Lata Agrawal
> 9699750643
> En Route Media Pvt. Ltd.
>
> *Winner of 'Innovative Creation of a New Medium' at the E4M & N2M Awards
> 2012*
> * *
>
> ****
>
> Click here <https://www.mailcontrol.com/sr/wQw0zmjPoHdJTZGyOCrrhg==> to
> report this email as spam.****
>
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> --
> *
> *Lata Agrawal
> 9699750643
> En Route Media Pvt. Ltd.
>
> *Winner of 'Innovative Creation of a New Medium' at the E4M & N2M Awards
> 2012*
> * *****
>
> ------------------------------
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--
*
*Lata Agrawal
9699750643
En Route Media Pvt. Ltd.
*Winner of 'Innovative Creation of a New Medium' at the E4M & N2M Awards
2012*
* *
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