Re: [9fans] More about /dev/draw

[Skip Tavakkolian <skip.tavakkolian@gmail.com>]

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a quick and easy way to get a local Plan 9 terminal is to use 9Pi (Plan 9
on Raspberry Pi). with Go 1.6 and later you can cross compile for plan9/arm.


On Sat, May 28, 2016 at 10:24 AM Dave MacFarlane <driusan@gmail.com> wrote:

> Either I'm going insane, the default Plan 9 /dev/draw in-memory
> implementation
> doesn't implement draw(3), or possibly both.
>
> When I do the following, it works as expected under both drawterm and a
> locally mounted instance:
> 1. Allocate a screen with an 'A' message
> 2. Allocate an image on the screen of the same size as /dev/wctl  with a
> 'b' message
> 3. Draw the image over the window with a 'd' message
> 4. Flush the buffer with 'v'
>
> When I do the following, it works under drawterm, but not with a local
> /dev/draw implementation:
> Steps 1-2 above
> 3. Allocate another image of some arbitrary fill colour with 'b' (with or
> without the repl bit)
> 4a. (Optional, doesn't seem to make a difference) set the compositing
> operator with 'O'
> 4b. Draw the new image over a portion of the window image from step 2 with
> 'd'
> 5. Go to step 3-4 from the first variation.
>
> (I don't have a 9front instance to test on.)
>
> On the other hand, replacing a portion of the image from step 2 with 'y'
> works under either. (I haven't gotten around to using 'Y' when appropriate
> yet.)
>
> Basically, I can only get any variation of this code:
> https://github.com/driusan/exp/blob/18a78a1549541d46d26cb6088a904585c386d812/shiny/driver/devdrawdriver/uploadimpl.go#L50
>
> to work under drawterm.
>
> The end result is that under a local Plan 9 instance the basic sample
> shiny test looks like this:
>
> http://driusan.github.io/plan9/basicmem.png
>
> Instead of this:
>
> http://driusan.github.io/plan9/basicdrawterm.png
>
> Does anyone have any pointers? I don't have much access to a physical Plan
> 9 machine, so I'm having trouble debugging this since it works under
> drawterm (or perhaps is buggy under drawterm in a way that makes it seem
> like it's working..)
>
> It would also potentially be helpful if someone who uses Go under 9front
> could let me know how x/exp/shiny/examples/basic looks with the shiny
> driver in that branch, but I'm not sure that it matters since it'll most
> likely be the same as one of the above..
>
> - Dave
>

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