Hi Thibault
I understand that it can be a memory problem, and I undertand too how to get
the size of data, but I'm trying to create a Image form nothing else (not a
copy or a modified picture from an other one) and so my problem is how to
compute the data size...
If x*y*3 is not the good solution, how can I compute the right size for a
RGB image ?
thanks
Regard.
Vincent.
2008/4/11, Thibault Genessay <[EMAIL PROTECTED]>:
>
> HI Vincent
>
> On Fri, Apr 11, 2008 at 9:04 AM, Vincent Bourdier
>
> <[EMAIL PROTECTED]> wrote:
>
> > I have a VS bug :
> >
> > Windows a déclenché un point d'arrêt dans 3DEM.exe.
> > Cela peut être dû à une défaillance du tas et indique un bogue dans
> 3DEM.exe
> > ou l'une des DLL chargées.
> > La fenêtre Sortie peut contenir des informations de diagnostic
> > supplémentaires
>
>
> This indicates that your application has corrupted the heap, most
> probably by writing out the bounds of a buffer. It is not a "VS bug",
> it is just Visual Studio (actually, the debug CRT) telling you that
> you did something wrong.
>
>
> > But If I put in comment the previous lines of my code, no bug appears...
>
> > Is there any important bug which have been resolved from the last
> realease
> > (OSG 2.2) in osg::Image ?
>
>
> The osg::Image class is robust and does not have bug AFAIK, so your
> code is certainly guilty.
>
> > Any ideas ?
>
> I'd bet on a difference between the buffer size osg::Image::setImage()
> expects and the buffer you actually give it.
> There is no guarantee that the actual size of the data for an RGB
> image is 3*width*height, because the memory layout might be different
> - there can be padding zero bytes at the end of each line if your
> dimensions are not powers of two.
> You should compute the actual line length (which is >= width) and
> multiply it by the height to get the actual buffer size needed. For
> instance, somewhere in my code I have a function that extracts a
> sub-image from an osg::Image that goes like this:
>
> osg::Image* createSubImage(const osg::Image* source, int src_s, int
> src_t, int width, int height)
> {
> assert(source);
>
> int padding = source->getPixelSizeInBits()/8;
> int rowSize = width * padding;
> Buffer<unsigned char> dest_data(rowSize * height); // This is a
> wrapper around unsigned char* that allocates the desired size and
> frees the pointer when it goes out of scope
> for (int i=0;i<height;i++)
> {
> memcpy(&dest_data[rowSize*i], source->data(src_s,
> src_t+i), rowSize);
> }
>
> osg::Image* dest = new osg::Image;
> dest->setImage(width, height, 1,
> source->getInternalTextureFormat(),
> source->getPixelFormat(),
> source->getDataType(),
> dest_data.detach(), // Steal the data pointer from the
> Buffer<> so
> that it is now owned by the new osg::Image
>
> osg::Image::USE_NEW_DELETE);
>
>
> return dest;
> }
>
> Hope this helps
>
> Regards
>
>
> Thibault
>
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