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Re: [pygame] blitting feature request



This sounds pretty cool.  Although I'm not really sure
what it would be good for?




 --- Ken Seehof <kseehof@neuralintegrator.com> wrote:
> Unless I missed something, there is no support for
> blitting with boolean 
> operators,
> as is supported by nearly all GUI systems.  The only
> mode currently 
> supported is
> "paint" mode.
> 
> What would be really cool would be the blitting
> model used by the Amiga.  The
> Amiga supports all 256 possible boolean operators on
> 3 inputs by using an 8 bit
> truth table.  The inputs are (source, mask, dest),
> the ouput is dest.
> 
> What's cool about this model is that if you define
> the following constants to
> represent the three inputs...
> 
> A = 10101010
> B = 11001100
> C = 11110000
> 
> ... you can get the desired boolean operator code by
> applying the operators to
> A, B and C.  This makes your code very easy to read.
> 
> XOR = A^C
> PAINT = (A&B)|(C&~B)
> 
> e.g.:
> 
>     target.blit_bool(source, None, XOR, rect)
> 
> These operator codes would, of course, have to be
> mapped to the appropriate
> codes specific to the target hardware platform, and
> operators that reduce to 2
> input operators would be optimized accordingly.
> 
> - Ken
> 
> 


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