How to add a background to a watchface

Hello,

I am trying to adapt my forerunner 945 watchface to the forerunner 965.

Before, I was doing this to add the background :

function initialize() {
    WatchFace.initialize();

    background = new WatchUi.Bitmap({
        :rezId=>Rez.Drawables.totoro,
        :locX=>0,
        :locY=>0
    });
}

function onUpdate(dc) {
    dc.clearClip();
    
    // Background
    background.draw(dc);
    background.setLocation(0, 0);
}

It was working fine withe the 945, but now, with the 965, it displays nothing...

Can you help me figure out why ?

Thank you

0 flowstate 7 months ago in reply to HACHIKO.AUD

HACHIKO.AUD said:
I think it has something to do with the AMOLED Display,

That could be it.

In the sim, select Settings > Display Mode > Always-On.

If your watchface's display would be automatically shut down due to burn-in protection rules, the sim will tell you. I tried this with the Analog SDK sample, and I get this:

If you get this message, you'll have to change your watchface to follow the stated burn-in rule (in this case, use no more than 10% of display luminance/brightness).

Note that that burn-in rules are different for older AMOLED devices. (e.g. use no more than 10% of pixels, or no pixel can be on for more than 3 minutes)

https://developer.garmin.com/connect-iq/connect-iq-faq/how-do-i-make-a-watch-face-for-amoled-products/

[https://developer.garmin.com/connect-iq/user-experience-guidelines/watch-faces/]

[AMOLED burn in rules apply in low power mode]

So basically, in low power mode (when user isn't actively looking at the watch), your watchface will probably not be able to display the background image (or any detailed UI), but will have to display a much simpler screen. You can see kind of thing in this native and CIQ watchfaces on a real Garmin AMOLED devices (and also on older Apple Watches.)

You will probably only be able to display the image in high power mode (for a few seconds after the user turns their wrist to look at the watch).

0 HACHIKO.AUD 7 months ago in reply to flowstate

I have been able to display the image, but even though the image is 454*454, it is tiny on the screen. For that, I use the WathUI.loadResource() and dc.drawBitmap().

Is there a way to display it in its full size ?

0 flocsy🤠 7 months ago in reply to HACHIKO.AUD

why do you have clipping in your code?

0 HACHIKO.AUD 7 months ago in reply to flocsy🤠

What do you mean ?

0 flocsy🤠 7 months ago in reply to HACHIKO.AUD

Why do you have dc.clearClip(); in your code?

Though I think it doesn't matter. At first I thought you might have a smaller clip area and the image you display is squeezed into that, but that's not how clipping would work, you would see the original size but only part of it. And probably clearClip anyway would make it use the full screen.

0 flowstate 7 months ago in reply to HACHIKO.AUD

HACHIKO.AUD said:
Is there a way to display it in its full size ?

Not sure. Might have to see more of your code, including the resource XML and the image itself.

To be clear you are now using WatchUi.loadResource() and *not* WatchUi.Bitmap() to load the image, correct? (Not that it should really make a difference.)

0 HACHIKO.AUD 7 months ago in reply to flocsy🤠

I have clipping because with the forerunner 945 I was updating only this part in the onPartialUpdate().

0 HACHIKO.AUD 7 months ago in reply to flowstate

Yes, because it was working juste fine before.