(old)Puppy Linux Discussion Forum

musher0 wrote:Hello, all.

Sorry to bother you, but there seems to be very little Linux info on this
subject on the Web.

Where is video memory address of desktop #2? How do we locate it?
How long is it if I have a 1280x1024 screen? Or a 1024x768 screen?

Possible practical application:
If we could detect the beginning address of video memory for
desktop #2, we could use it as a trigger for changing its backdrop.

For ex., if we move to desk #2, we ask ROX to use PuppyPin2.

This in partial reply to someone who asked a similar question based on
xfce on Mint, but I can't find the thread anymore. But I've been toying
with the idea for Puppy for a few years.

Thanks in advance for any input.

musher0

Ibidem wrote:

musher0 wrote:Hello, all.

Sorry to bother you, but there seems to be very little Linux info on this
subject on the Web.

Where is video memory address of desktop #2? How do we locate it?
How long is it if I have a 1280x1024 screen? Or a 1024x768 screen?

Possible practical application:
If we could detect the beginning address of video memory for
desktop #2, we could use it as a trigger for changing its backdrop.

For ex., if we move to desk #2, we ask ROX to use PuppyPin2.

This in partial reply to someone who asked a similar question based on
xfce on Mint, but I can't find the thread anymore. But I've been toying
with the idea for Puppy for a few years.

Thanks in advance for any input.

musher0

Ack! Ick! NO!
I'd expect segfaults if you tried that.
Size will depend on your bit depth as well as screen size and location has a large number of other factors.
If you have compression, there's no way to tell -and at least most Intel and AMD graphics systems do (compression).
If you don't, size is (internal bit depth * w * h )/ (8 bits per pixel).

Attach an instance to a desktop; the way to do this depends on your DE.
Log the PID.
Keep track of that for sending the new background.

wmctrl -s 0;rox -p="/root/Choices/ROX-Filer/PuppyPin"

wmctrl -s 1;rox -p="/root/Choices/ROX-Filer/PuppyPin1"

wmctrl -s 2;rox -p="/root/Choices/ROX-Filer/PuppyPin2"

technosaurus wrote:Fyi, jwm has the ability to set different bg images on different desktops.

musher0 wrote:

technosaurus wrote:Fyi, jwm has the ability to set different bg images on different desktops.

And how does one do that, kind sir? Perhaps there are code or configuration examples somewhere?
musher0

technosaurus wrote:It is a standard option in my jwm tools, but I got all of the details directly from joewing.net/jwm iirc. You can also have mxn desktops now (that made it a bit tricker to figure out which was which) as for the icons, you can use different trays (multiple if you want) per desktop via jwm ala wbar without animation (scottman uses one for drives in akita and ptray is based on it) ... Btw, menus dont have to be just for apps either, you can build one to represent anything like showing all drives and having the possible actions in the submenu (if mounted show unmount, if unmounted, show mount, etc...)