[Kdenlive-devel] [Mlt-devel] Qt based text producer

[Marco Gittler]

A first version is now at git://github.com/gmarco/mlt.git  
(kdenlivetitle)

first ist makes only a simple text that moves in the window.
later it sould read the *.kdenlivetitle file direct an paint from the  
QGraphicsView.
After this, we could enable the Start-/Endview, to let the title  
scroll and zoom.

But first ist works with drawText on an QImage.

regards marco

Am 10.07.2009 um 16:01 schrieb Mathias Friman:

>
> ----Ursprungligt meddelande-----
> From: Marco Gittler g.marco at freenet.de
> Date: Fri, 10 Jul 2009 15:54:27 +0200
> To: j-b-m j-b-m at users.sourceforge.net
> Subject: Re: [Kdenlive-devel] [Mlt-devel] Qt based text producer
>
>
> Am 06.01.2009 um 19:43 schrieb j-b-m:
>
>>
>>> On Sat, Jan 3, 2009 at 12:49 PM, j-b-m <j-b-
>>> m at users.sourceforge.net> wrote:
>>>> I would like to add a Qt based text producer to MLT. The idea is to
>>>> somehow copy the code from the qimage producer, but instead of
>>>> loading an
>>>> image, we would write text on that image using the Qt classes. The
>>>> result
>>>> will be something like the pango producer, but I think that with
>>>> Qt we
>>>> should be able
>>
>> After some quick tests, it seems like this is sadly not possible.
>> Drawing text
>> over a QImage requires a QApplication to be created (because some
>> stuff needs
>> to be initialized), and creating it in an MLT module does not seem
>> possible...
>>
>> So I will stop working on that for now, unless someone with a good
>> knowledge
>> of Qt4 can find another way to solve that problem...
> i tested this shortly.
> this small sample here can write to QImage without QApplication, (uses
> QCoreApplication) and does not need QtGui
>
> #include <QCoreApplication>
> #include <QImage>
> #include <QPainter>
>
> int main(int argc, char** argv)
> {
>    QCoreApplication app(argc, argv);
>    QImage image(200, 200, QImage::Format_ARGB32);
>    QPainter painter(&image);
>    painter.drawText(100, 100, "Test");
>    image.save("test.png");
>    return 0;
> }
>
> with that and the code fro kdenlive for the titler, we sould be able
> to move the code into mlt.
> this should let us create then also scrolling titles. (zooming,
> scrolling ...)
>
> regards marco
>>
>>> Are you using pango now for the titler? I did not get that
>>> impression.
>>> I don't see how you would be integrating all that you have in the
>>> titler with producer_pango?!
>>
>> No, currently, the kdenlive titler created png images, so titles in
>> Kdenlive
>> are just images.
>>
>> regards
>> jb
>>
>>
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