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Steve Taylor asked

Is 4K resolution limited to video playback only? UI seems upscaled from 1080p.

I'm building a hybrid app (hosted web app running inside a native app with a WebView). I noticed that the resolution of img and canvas elements is limited to 1080p, which I discovered by rendering test pattern images in an img element and also by drawing test patterns in a canvas element. This is despite window.devicePixelRatio === 4 (which is true even when the display is 720p!).

I was worried that this was a WebView limitation, but I've also noticed that the entire Fire TV UI is a bit blurry, suggesting it's rendered as 1080p and upscaled (probably via hardware acceleration) to 2160p.

Is this really what's happening? Is true 4K resolution limited to 4K video playback only?

fire tv
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