[Qt-interest] QPainter segmentation fault on Linux

[Srdjan Todorovic]

Hi,

2009/2/20 Davide <davide83 at gmail.com>:
> On Fri, Feb 20, 2009 at 3:58 PM, Samuel Rødal <sroedal at trolltech.com> wrote:
>> I tried to reproduce it here with the following code:
>>
>> But it doesn't crash for me. Does this example crash for you?
>
> I didn't tried your example, but I've got an important update.

Could you please try Samuel's example? That way we can try to keep
this debugging session a bit more scientific.

> The program works in this way:
>
> I declared an array as private in my class:
>      uchar localdata[960000];
>
> and I add this code:
>      memcpy(localdata, Image.data, Image.width*Image.height*2);

Why multiply by 2?

>      qImage = new QImage(localdata, Image.width, Image.height,
> QImage::Format_RGB32);
>
> and than as always:
>     QPainter p;
>     p.begin(qImage);
>     p.setPen((Qt::GlobalColor)(Qt::cyan));
>     p.drawRect(2, 2, 20, 20);
>     p.end();
>
> In this way the program run magically without any error. I can see my
> image with a rectangle.
> The problem is that I shouldn't get an error even without this trick

Glad it finally works, but we should find out what went wrong...

> Furthermore it works in windows.

Haha. Made me laugh. ;)

Srdjan