[poppler] Implement overprint in qt interface?

[Thomas Freitag]

On 14.10.2012 22:58, Albert Astals Cid wrote:
> El Diumenge, 14 d'octubre de 2012, a les 19:41:26, Thomas Freitag va escriure:
>> On 14.10.2012 17:21, Albert Astals Cid wrote:
>>> El Diumenge, 14 d'octubre de 2012, a les 13:47:29, Thomas Freitag va
> escriure:
>>>> Hi folks!
>>>>
>>>> Is there anybody in the community who wants the possibility to simulate
>>>> overprint in qt library?
>>>> With the implementation of DeviceN support in splash this is quite easy
>>>> now, so I can upload a patch.
>>> Sure, why not? Let's see the patch :-)
>> Okay, here it is.
> The two new methods are missing @since markers (and also i think the
> documentation of the two methods could be a bit more explanatory)
@since: I thought that You insert it when You commit it. If I would 
insert 0.22.0 You have to change it if You will not have the time to 
commit it :-) or I need to change it and have to upload a new patch if 
You will not have the time :-(
Explanatory: Okay, but this will be hard. For those who know what 
overprint is the documentation is self-explanatory, for others I need to 
write reams. What's about to insert the link to 
http://en.wikipedia.org/wiki/Overprinting?
>
> Also why are you calling it "overprint preview"? How is it a preview?
To be honest, I haven't really thought about that. Probably I choose 
that name because it is also introduced in GlobalParams with that name. 
But also in the acrobat reader preferences it is called "Use overprint 
preview". And because not all RIPs support it (i.e. RGB printers) it is 
indeed something like a preview (for RIPs which support it).
>
> Given that overprint only works if defined(SPLASH_CMYK) you should make the
> setter return a boolean that says if the set worked or not (i.e. make it fail
> if !defined(SPLASH_CMYK))
Gotcha. I thought about that and disable / enable the option in okular 
if the format generator doesn't support it. But because I'm not familiar 
enough with okular I defered it and then forgot it...
I'll insert it in QT when I get answers to the other points.

Cheers,
Thomas
>
> Cheers,
>    Albert
>
>> In a few places it has already a similar
>> implementation than in bug 50992 (thread safe), because changing the
>> overprint option also meant that we need a different SplashOutputDev
>> instance. But You probably also want to test it in okular? Even if we
>> are here not on an okular list, I attach the okular patch here, too.
>> Also here, it has already the changes from bug 50992. But because
>> POPPLER_QT_THREADSAFE is not defined here, it doesn't make any
>> difference, so I let these changes as they are. BTW, I'm not really
>> familiar with qt programming, so most changes in okular are more or less
>> a (hopefully) best guess.
>>
>> Cheers,
>> Thomas
>>
>>> Cheers,
>>>
>>>     Albert
>>>> For everybody who doesn't know anything about overprint I attach three
>>>> screenshots which shows the implementation in okular.
>>>> (This is not fake, I made a small apprentice piece today morning :-) )
>>>>
>>>> Cheers,
>>>> Thomas
>>> _______________________________________________
>>> poppler mailing list
>>> poppler at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/poppler
>>>
>>> .
> _______________________________________________
> poppler mailing list
> poppler at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/poppler
>
> .
>