Re: [AD] Question about 256 colors modes

[Hugo Daniel Caro <hugo_caro@xxxxxxxxxx>]

Hi Pete!

Thanks for your prompt answer.

In fact, I've checked my program vs. the "test"
program and you are right, the problem is that
transparent must be index 0, but the color at index 0
is the "transparent" one.

Then I will re-formulate my question. Is there any
reason that index 0 "has" to be the transparent color?
Could you change which color index is transparent? The
problem I've found is that sometimes the graphics
programs (e.g. Photoshop) does not put the rgb=(0,0,0)
at index 0 by default, then you can find that
masked_blit does not "mask" because of this. In my
case, the (0,0,0) appeared at index 254... (!?).

Thanks in advance,

Kind regards,
Hugo Caro
Gaming Software Developer


 --- Peter Hull <peter.hull90@xxxxxxxxxx> escribió:

> Eh? Is this true? I thought that index 0 was always
> transparent, but that it could be any RGB colour. In
> fact, isn't it set to white in the 'test' program?
> 
> Pete
> 
> > 
> > From: Hugo Daniel Caro <hugo_caro@xxxxxxxxxx>
> > Date: 2005/12/14 Wed PM 02:54:09 GMT
> > To: alleg-developers@xxxxxxxxxx
> > Subject: [AD] Question about 256 colors modes
> > 
> > Hi everybody,
> > 
> > I guess this is an old topic, but I would like to
> know
> > why, in 256 colors mode, do you "have" to have the
> > "black" (rgb=0,0,0) color at the palette[0] in the
> > palette table. Is there any reason where it should
> be
> > there? I remember some very old video cards
> required
> > that...
> > 
> > This makes that, if you have other rgb pattern at
> > palette[0] rather than (rgb=0,0,0), masked_blit
> does
> > not do it's work.
> > 
> > I would suggest to add another function, something
> > like "set_masked_blit_color" to tell allegro which
> > color index is to be considered for
> transparency...
> > (which would allow to use other color than black
> as
> > "transparent").
> > 
> > Thanks for all your support, and sorry if this is
> at a
> > FAQ (I didn't found it).
> > 
> > Kind regards,
> > Hugo Caro
> > Gaming Software Developer
> > 
> > 
> > 	
> > 
> > 
> > 	
> > 		
> >
>
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