Re: [AD] getpixel conflict with alpha blended sprites

[Robert Jr Ohannessian <rohannessian@xxxxxxxxxx>]

Could we just consider getpixel() to be unreliable outside the BITMAP? 
For backward compatiblity, we need to keep the old behavior, but that 
should be depricated. That is, no (new) code should expect get_pixel() 
to return something meaningful if it's used outside the bitmap's area.

btw, don't clip rectangles apply only to pixel writes, not reads?


Evert Glebbeek wrote:
> On Mon, Nov 17, 2003 at 12:19:20PM +0100, Sven Sandberg 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... :(
>
> Evert
>
>
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--
- Robert Jr Ohannessian
http://bob.allegronetwork.com/