* [9fans] xor draw
@ 2013-02-14 18:51 Yaroslav
2013-02-14 19:10 ` erik quanstrom
0 siblings, 1 reply; 3+ messages in thread
From: Yaroslav @ 2013-02-14 18:51 UTC (permalink / raw)
To: 9fans
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we can't do XOR drawing with draw(2) like with bitblt, can we?
--
- Yaroslav
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [9fans] xor draw
2013-02-14 18:51 [9fans] xor draw Yaroslav
@ 2013-02-14 19:10 ` erik quanstrom
2013-02-14 20:31 ` Yaroslav
0 siblings, 1 reply; 3+ messages in thread
From: erik quanstrom @ 2013-02-14 19:10 UTC (permalink / raw)
To: 9fans
On Thu Feb 14 13:52:09 EST 2013, yarikos@gmail.com wrote:
> we can't do XOR drawing with draw(2) like with bitblt, can we?
if there's a trivial α channel, it's possible. otherwise one
runs the risk of α multiplication.
- erik
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [9fans] xor draw
2013-02-14 19:10 ` erik quanstrom
@ 2013-02-14 20:31 ` Yaroslav
0 siblings, 0 replies; 3+ messages in thread
From: Yaroslav @ 2013-02-14 20:31 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
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2013/2/14 erik quanstrom <quanstro@quanstro.net>
> On Thu Feb 14 13:52:09 EST 2013, yarikos@gmail.com wrote:
>
> > we can't do XOR drawing with draw(2) like with bitblt, can we?
>
> if there's a trivial α channel, it's possible. otherwise one
> runs the risk of α multiplication.
>
>
No alpha there - I'd like to learn the trick please.
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2013-02-14 18:51 [9fans] xor draw Yaroslav
2013-02-14 19:10 ` erik quanstrom
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