Hi Alan,
this really may be a qt related issue. But it is not a qt5 issue as the
result is the same with qt4.8.
Most likely the import rgb images format available in qt does not quite
mach the ARGB format output from memcairo.
Regards,
On Thu, Jul 31, 2014 at 7:40 PM, Alan W. Irwin <ir...@beluga.phys.uvic.ca>
wrote:
> On 2014-07-31 15:47+0100 António Rodrigues Tomé wrote:
>
> Hello,
>>
>> as the qt driver for qt5 is not 100% yet I decided to play a little with
>> the memcairo driver with the aim of latter on rendering a qt widget with
>> the driver output, avoiding the need of outputting a png file and then
>> rendering a widget (this latter case works pretty well).
>>
>> My question is if the memcairo ignores the plscolbga calling?
>>
>> I'm attaching three screenshots based in the x01c example.
>>
>> test0.png was obtained by converting the memcairo driver output to qt but
>> considering it was a RGB image and not a ARGB. I'm including it only
>> because I found it fun the fact it is exactly the output of the original
>> example in spite I've called plscolbga function.
>>
>> test1.png results from importing the memcairo output considering it an
>> ARGB image, swapping the rgb obtaining exactly the same colors for the
>> lines and labels but the background stays white.
>>
>> test2.png is the result I would like to had for test1 as it is makes
>> exactly the same call to plscolbga but the output was obtained by
>> pngcairo
>> instead of memcairo.
>>
>> I also attach a zip file with the qt program I used to obtained the
>> screenshots. There is three actions in the actions menu, each of the
>> actions corresponds to one of the screenshots.
>>
>> I made the program in qt5 but it should be easy to compile and run it with
>> qt4.8 as it also shoud be very easy to read as +90% of the code is from
>> x01c.
>>
>
> Hi António:
>
> I had a quick look at drivers/cairo.c, and could not spot any obvious
> problems with colour and transparency handling for memcairo.
>
> Furthermore, since you have previously found obvious display
> differences between the various qt device drivers for your particular
> installation of Qt5, and there are other problems with Qt5 (i.e.,
> character alignment) that I confirm here, the present issue may just
> be another example of the result from a Qt5 bug which can only be
> fixed by Qt5 developers.
>
> For now, the evidence seems to be that Qt5 is pretty unreliable so I
> suggest you try the same experiments with Qt4.8 to see if all those
> issues you are encountering with Qt5 go away.
>
> Alan
> __________________________
> Alan W. Irwin
>
> Astronomical research affiliation with Department of Physics and Astronomy,
> University of Victoria (astrowww.phys.uvic.ca).
>
> Programming affiliations with the FreeEOS equation-of-state
> implementation for stellar interiors (freeeos.sf.net); the Time
> Ephemerides project (timeephem.sf.net); PLplot scientific plotting
> software package (plplot.sf.net); the libLASi project
> (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
> and the Linux Brochure Project (lbproject.sf.net).
> __________________________
>
> Linux-powered Science
> __________________________
>
--
António Rodrigues Tomé
Universidade da Beira Interior
Instituto D. Luís (lab associado)
email address:
art...@gmail.com
art...@ubi.pt
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