[Digikam-devel] Thumbnails

[Gilles Caulier]

2009/5/24 Gilles Caulier <caulier.gilles at gmail.com>:
> 2009/5/24 Gilles Caulier <caulier.gilles at gmail.com>:
>> 2009/5/24 Arnd Baecker <arnd.baecker at web.de>:
>>> On Sat, 23 May 2009, Andi Clemens wrote:
>>>
>>>> Hi,
>>>>
>>>> is it possible that our thumbnails are somehow not compatible with dolphin or
>>>> gwenview?
>>>
>>> Maybe this entry
>>>  https://bugs.kde.org/show_bug.cgi?id=152877
>>> is of relevance here?
>>> (Or is this one already solved in svn?)
>>
>> I think it's not fixed yet... and i think it's the Andi problem...
>>
>> I take a look to compare KDE thumb generator and digikam code...
>>
>> Gilles
>>
>
> Arnd,
>
> Look code here :
> http://lxr.kde.org/source/extragear/graphics/digikam/libs/threadimageio/thumbnailcreator.cpp#247
>
> uri is a QString. There is no latin conversion to record Uri in text
> png chunk. so no problem from digiKam code here.
>
> BUT, ztxt png text chunk only support latin code from PNG library.
>
> http://www.libpng.org/pub/png/spec/iso/index-object.html#11tEXt
>
> ONLY itxt png text chunk oly support UTF-8 char encoding, and the
> method to create itxt png chunk is disable until libpng 1.4.0...
>
> http://www.libpng.org/pub/png/spec/iso/index-object.html#11iTXt
>
> The question is : how Qt4::Qimage do to record QString in png text chuck ?

It sound like Qt record info as byte array into zTxt chunk. And it's work.

Andi, my commit #972293 must fix your problem, at least between
gwenview and digiKam. Uri is the same now.
For dolphin, no idea. I can't find right code from
kdebase::kio-thumbnail loader.

Gilles Caulier