get raw canvas pixel of browser

[hien]

I am hitting an issue where the "final" OnPaint() event containing the pixel data for the whole page is extremely delayed. If I wait long enough (sometime a whole second), then I will eventually get it. Ideally I would like to know exactly when the final pixel buffer is painted. I have already received the OnLoadEnd() event, so I know the page has already finished loading whatever the semantic for that is. Does CEF provide an interface to access the raw pixel data instead of relying on the OnPaint() event.

[magreenblatt]

CEF delivers OnPaint notifications when something changes. There is no concept of a "final" OnPaint, but you can trigger an OnPaint by calling CefBrowserHost::Invalidate.

[hien]

What does OnLoadEnd() guarantee? It is a bit frustrating that I have to add an arbitrary wait time after OnLoadEnd() to get the pixel buffer containing the image for the whole page. I tried calling Invalidate() after an OnLoadEnd(), but that doesn't necessarily give me a valid pixel buffer on the next OnPain() event.

Is there a way for me to know when the page has finished rendering?

[magreenblatt]

How do you define "finished rendering"? Async JS timers, etc, can mutate the DOM forever even after the "onload" event has fired.

[hien]

Given that the page does not have any javascript, I expect finished rendering means the page has loaded and rendered all resources that are defined based on the given html.