[Vm-dev] BitBlt looking for rule blitting an alpha mask + constant color

Andreas Raab andreas.raab at gmx.de
Sat Jun 20 00:34:16 UTC 2009

Igor Stasenko wrote:
> 2009/6/20 Andreas Raab <andreas.raab at gmx.de>:
>> Easy. Make a color map that is set up such that
>> cmap := Bitmap new: 256.
>> 0 to: 255 do:[:i|
>>  cmap at: i+1 put: (constColor alpha: i/255.0) pixelValue32.
>> ].
> That is possible, but the price is generating a color map each time
> the color changes :(
> Much less price than converting/using 32 bpp, but still is not perfect :)

It's utterly trivial to cache it. If you're using this for font display 
you'll only have a few colors to deal with so the cache won't be big.

> Any advice, how to force rule 41 work correctly? Or it is impossible? :)
> Btw, i don't sure that my VM (windoze) having latest & fixed rule 41.
> I remember there were problems with it.

I'm not sure what rule 41 does. The Windows VM contains whatever is in 

   - Andreas

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