Re: [pygame] ARGB vs. RGBA

[Tim Ansell <mithro@xxxxxxxxxx>]

Hello,

You can use my SDL_Surface.py hack to get a ctypes pointer to the pixel
data. http://www.thousandparsec.net/repos/libmng-py/mng/pygame/

I needed this to make libmng-py as fast as possible.

Hope this helps!

Tim Ansell

On Sat, 2006-12-16 at 14:49 +0100, Jakub Piotr CÅapa wrote:
> Pete Shinners wrote:
> > On Fri, 2006-12-15 at 12:07 +0100, Jakub Piotr CÅapa wrote:
> >> I was trying to make some data exported from cairo as a ARGB (literally 
> >> in this byte order on my big-endian machine, A beign in the lowest 
> >> address) buffer into a PyGame surface but run in to some problems.
> >>
> >> The code which creates the bitmasks required by the SDL conversion 
> >> routine does some really strange things.
> >> For RGBA it takes the notation as a literal byte order in memory, low 
> >> address first and simply swaps the 4 bytes on BE vs. LE.
> > 
> > I'm not sure the problem. Passing the mask arguments when creating
> > surfaces should allow any byte orderedering.
> > 
> > size = 100, 100
> > rgba_mask = 0xff000000, 0xff0000, 0xff00, 0xff
> > rgba_surf = pygame.Surface(size, 0, 32, rgba_masks)
> > 
> > argb_mask = 0xff0000, 0xff00, 0xff, 0xff000000
> > argb_surf = pygame.Surface(size, 0, 32, argb_masks)
> 
> I was thinking about pygame.image.frombuffer which requires a string 
> (and not an arbitrary bitmask tuple). I don't think pygame.Surface 
> allows for creating surfaces out of arbitrary python buffers.
>