Save performance when rotating screen e.g. on Raspberry Pi

ptrk95

@keyun21 Correct, just give it a go and see what happens ;) Just delete the lines if something strange occours.

@justjim1220 Thanks for sharing! :)

Only disadvantage here is that you may have to change the styles of other modules, for example the Snow module doesn’t work right of the bat I think.

Also note that there might be a better way to code it, since I just googled how to rotate with CSS :D

evroom

@ptrk95 said in Save performance when rotating screen e.g. on Raspberry Pi:

and want to rotate the screen you can rotate

Did you counter clockwise rotated you screen ?
And therefore did ``transform: rotate(90deg);```??

I originally rotated my screen clock wise (so the top now is on the right hand side) using /boot/config.txt and display_hdmi_rotate=3.
This works fine.

When I use your css example and take out the /boot/config.txt line, it does not work right.
I figured I need rotate(270deg), but then I do not see anything.

Besides that, the omxplayer modules need to be adjusted too (–orientation parameter), so I reverted back to my old method.

My question: can you setup your screen so that it rotates this way that you see everything upside down (to simulate a clockwise rotation in your case) ??
And then share the css code.

ptrk95

@evroom Yes, I did rotate it counter clockwise.

I found a solution that worked for my setup, rotating the screen 270:

 body {
	margin: 0;
	position: absolute;
 	transform: rotate(-90deg);
 	transform-origin: top left; 
	width: 100vh;
	height: 100vw;
	
	object-fit: cover;
	top: 100vh;
        visibility: visible;
 }

Tell me if that worked for you. Then I`ll update the post :)

Adjusting the omxplayer orientation is one of the drawbacks.

evroom

@ptrk95 said in Save performance when rotating screen e.g. on Raspberry Pi:

Tell me if that worked for you.

Almost, but not quite.
It does rotate clock wise, but it is centered.
In Excel analogy: vertical alignment: center.
I would need ‘top’.

This is my custom.css, probably the other settings interfere:

body {
  margin: 0;
  position: absolute;
  transform: rotate(-90deg);
  transform-origin: top left;
  width: 100vh;
  height: 100vw;

  object-fit: cover;
  top: 100vh;
        visibility: visible;
 }

.region.top.left {
  width: 60%;
}

.region.middle.center {
  width: 60%;
}

.region.bottom.left {
  width: 60%;
}

.MMM-HTMLBox {
  font-size: 18px;
  line-height: 22px;
}
.MMM-RTSPStream header {

  text-align: left;
}

.MMM-RTSPStream .innerWrapper {
  border-style: none;
  //border: 1px solid red;
}

I want the left side modules to occupy 60% and the right side modules 40%.
Maybe I have to interpret top, middle and bottom different now ?

evroom

Okay, found it.

In my /boot/config.txt I had the width and height set to 900 and 1600 and this has to be now 1600 and 900.
This is working:

display_hdmi_rotate=0
framebuffer_width=1600
framebuffer_height=900

Works now.

Only need to modify the omxplayer lines to have those streams rotated too.

thedk

Didnt work that easy for me.

You have to take the resolution of your display/monitor in the config.txt, not just 1600,900.
I had to enable overscan, cause the picture was to big.
If you’re using the MMM-Remote_Control the picture is rotated when you have a look at your MagicMirror.

I switched back to the fake KMS driver.

j.e.f.f

Great hack!! I’m going to add this to my CSS 101 guide if that’s OK. I think this is incredibly useful.

ptrk95

@j-e-f-f thank you! Of course you can :)

Joern

Hello,

Iam struggeling on my PI3 to rotate by 90deg to right. Monitor has 1920x1080.
But I see only black screen at any other position than -90deg!!
As I need to change to 90deg or -270deg I got only black screen (also 180deg even) …

So I changed config.txt to:

display_hdmi_rotate=0
framebuffer_width=1920
framebuffer_height=1080

& custom.css to:

body {
        margin: 0;
        position: absolute;
        transform: rotate(90deg);
        transform-origin: top left; 
        width: 100vh;
        height: 100vw;
        object-fit: cover;
        top: 100vh;
        visibility: visible;
}

What is missing?

Worse case I change physical mounting way, but not preferred :face_with_stuck-out_tongue_winking_eye:

Joern

transform: rotate(90deg);
transform-origin: top right;

works at least see have screen, but only half screen is used, so no option…