Re: [AD] getpixel conflict with alpha blended sprites

[Sven Sandberg <svens@xxxxxxxxxx>]

Evert Glebbeek wrote:
> > So, if I wanted to read an entire pixel, including the alpha channel, 
> > how would I do that?
>
> We could add a seperate get_pixel_alpha() function?
> IMHO though, the fix would be to expose the cipping rectangle detection, ie,
> add a function that returns TRUE or FALSE depending on wether a point falls
> within the clipping rectangle and have the value of get_pixel() be undefined
> whenever that happens.
> This is probably undoable because it breaks the API though... :(

I think that would break the API less than the first suggestion. What is 
geta() for if getpixel() doesn't return alpha? I thought reading alpha 
was a typical way of using getpixel(). And it is already trivial to 
check if you are reading outside the bitmap, by comparing with 
BITMAP->cl, BITMAP->cr, BITMAP->ct, BITMAP->cb.

Sven