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I'm using OpenLayers 6.13 in an iOS app. The app also runs on macOS (Mac Catalyst). The OpenLayers component runs in a WKWebView (essentially a Safari-esque web browser view, embedded in the app).

When running on the Mac if I increase the size of the window, the vector layers disappear and the javascript console reports the error:

Canvas area exceeds the maximum limit (width * height > 16777216).

If I decrease the window size again, the layers re-appear on the map.

(The WMTS layers never disappear, even when the window is larger.)

What's very odd about this, is that I can get the same layers to run in a very similar actual web site in actual Safari in the same map in a much larger browser window. The problem only seems to exist in my WKWebView.

How can this error be avoided in larger windows with OpenLayers?

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    If the problem to due to a very high resolution device you could set the pixelRatio option in the map constructor. Otherwise try v6.15 or later there were some efforts made to reduce canvas use github.com/openlayers/openlayers/releases/tag/v6.15.0
    – Mike
    Commented Sep 10, 2022 at 9:27
  • Thanks @Mike , v6.15.1 did not help, but changing the map's 'pixelRatio' to 1.0 did resolve it. I think that this is going to be the solution for me for now. If you write it up as an answer, I'll be happy to mark it correct (otherwise, I will do so later).
    – Son of a Beach
    Commented Sep 11, 2022 at 5:44

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