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* [9fans] alpha channel
@ 2008-12-24 20:28 Tharaneedharan Vilwanathan
  2008-12-27 23:10 ` Russ Cox
  0 siblings, 1 reply; 3+ messages in thread
From: Tharaneedharan Vilwanathan @ 2008-12-24 20:28 UTC (permalink / raw)
  To: Fans of the OS Plan 9 from Bell Labs

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hi,
this is regarding alpha channel.

i am able to change the alpha value for an image by setting new alpha value
for every pixel.

but i was thinking we also could set the alpha value for all of the pixels
in a window/screen just but setting the value somewhere, say using ctl. is
this not possible in plan9 or inferno? i am wondering how i got that
thinking.

thanks
dharani

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^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [9fans] alpha channel
  2008-12-24 20:28 [9fans] alpha channel Tharaneedharan Vilwanathan
@ 2008-12-27 23:10 ` Russ Cox
  2008-12-28 11:56   ` Tharaneedharan Vilwanathan
  0 siblings, 1 reply; 3+ messages in thread
From: Russ Cox @ 2008-12-27 23:10 UTC (permalink / raw)
  To: Fans of the OS Plan 9 from Bell Labs

> this is regarding alpha channel.
> i am able to change the alpha value for an image by setting new alpha value
> for every pixel.
> but i was thinking we also could set the alpha value for all of the pixels
> in a window/screen just but setting the value somewhere, say using ctl. is
> this not possible in plan9 or inferno? i am wondering how i got that

the graphics operators support alpha blending
but the window system still assumes, at a deep level,
that windows are opaque rectangles.

russ


^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: [9fans] alpha channel
  2008-12-27 23:10 ` Russ Cox
@ 2008-12-28 11:56   ` Tharaneedharan Vilwanathan
  0 siblings, 0 replies; 3+ messages in thread
From: Tharaneedharan Vilwanathan @ 2008-12-28 11:56 UTC (permalink / raw)
  To: Fans of the OS Plan 9 from Bell Labs

hi russ,

thanks for the info.

thanks
dharani

On Sat, Dec 27, 2008 at 3:10 PM, Russ Cox <rsc@swtch.com> wrote:
>> this is regarding alpha channel.
>> i am able to change the alpha value for an image by setting new alpha value
>> for every pixel.
>> but i was thinking we also could set the alpha value for all of the pixels
>> in a window/screen just but setting the value somewhere, say using ctl. is
>> this not possible in plan9 or inferno? i am wondering how i got that
>
> the graphics operators support alpha blending
> but the window system still assumes, at a deep level,
> that windows are opaque rectangles.
>
> russ
>
>



^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2008-12-28 11:56 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2008-12-24 20:28 [9fans] alpha channel Tharaneedharan Vilwanathan
2008-12-27 23:10 ` Russ Cox
2008-12-28 11:56   ` Tharaneedharan Vilwanathan

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