[Lazarus] Without root rights on Ubuntu, how?

[Osvaldo Filho]

Le Jeudi 18 Février 2010 12:46:51, Felipe Monteiro de Carvalho a écrit :
> Hello,
> 
> How can one use an alpha channel in TRasterImage/TBitmap?
> 
> I am trying to figure out how to use it, but I can't think of any way
> except using TLazIntfImage...
> 
> And even then it would be rather problematic because the image drawing
> routines wouldn't have Alpha support.
> 
> thanks,
TImage and TRasterImage are components that ease image manipulation. The good 
news is that it can support many image format (bmp, jpeg, png and many more). 
The bad news is that it can't support features that are not supported by all 
the images format it support. As alpha channel are supported by a very few of 
them it can't be supported by a generic TBitmap.

To do what you want you can use TPortableNetworkGraphic (for PNG format) in 
place of TBitmap. It's nearly the same interface (common parent component) 
with PNG format abilities in more (such as alpha channel).

Regards.
-- 
Geoffray "fatalerrors" Levasseur
http://jeff.levasseur.tuxfamily.org/
Sic luceat lux et pax