[Lazarus] Graphics changes (r15472)

[Marc Weustink]

Kostas Michalopoulos wrote:
>>> Yeah, this pretty much destroyed the material thumbnails in my 3D design
>>> app. Any workaround or this will come back soon? :-)
>>
>> Revert to r15471
>>
>> Marc
> 
> That, or make a patch :-P.
> 
> I've attached my fix. Seems that TCustomBitmap.SetSize was doing nothing 
> except filling some values in a TDIBSection which weren't used. I kept 
> them there (because i didn't tracked where they're actually used), but 
> also wrote code that updates the width/height info in FImage.Description 
> and allocates data for the pixels. I use RawimageNeeded too to obtain a 
> valid description (i just put the new width and height there).
> 
> This makes both the autocompletion and changing TBitmap size code to work.

autocompletion ??

anyway, I need to think about this. Setting the width/height might be an 
issue of TRasterImage too. Allocation of data is not needed (yet)

About the DIBsection, that code will be removed and gets replaced by the 
rawimage.

Marc