Blank/Broken Images with chrome.tabs.captureVisibleTab() ?

[John Beales]

Hello,

I'm running into a situation where captureVisibleTab() gives me an
empty image. Here's what I think is happening:

- I have several tabs and/or windows open.
- My extension switches to the tab that I want to capture, (I've tried
both simply switching to it in its existing window and moving it to a
new window where it's by itself).
- Even though the tab is completely loaded and has been rendered by
the browser it takes a moment before it's re-rendered on the screen.
During this time a white screen is displayed and an image of that
white screen is captured.
- The tab re-renders its contents, but too late.

I notice the white-screen phenomenon even when I'm browsing the web
sometimes, especially if I have a lot of tabs open or my computer's
been asleep for a while. It can take a very long time to render the
tabs that I have open when I switch to them.

So, is there a way of knowing if a tab has been re-rendered? I've
checked tab.status but it's not consistent.

At the moment I'm setting a timeout, but I would prefer to know when
the tab is visible so I don't have to guess how long it will take
under all different conditions.

Thanks!

John

[Boris Smus]

Due to a breaking change in M11:

http://code.google.com/chrome/extensions/whats_new.html#11

You now need host permissions to use the captureVisibleTab. More info on this thread:

http://groups.google.com/a/chromium.org/group/chromium-extensions/browse_thread/thread/105a502aa201f5d0/db529c7255e4f6bc

- Boris

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[Boris Smus]

Sounds like a bug with good repro steps! Could you file it on crbug.com?

Thanks,

- Boris

On Mon, Jun 13, 2011 at 9:43 AM, John Beales <johnb...@gmail.com> wrote:

I've got the permissions, and am able to capture the image if I wait, (around 1/2 second seems to be long enough at the moment), but if I do it very quickly, (instantly), after switching to the tab nothing is captured.

John

[Boris Smus]

Thanks John.

On Mon, Jun 13, 2011 at 9:58 AM, John Beales <johnb...@gmail.com> wrote:

The bug is submitted at: http://crbug.com/85926

On Monday, June 13, 2011 at 12:50 PM, Boris Smus wrote:

Thanks! Could you also post the crbug.com/NNN URL to the chromium group?

- Boris

On Mon, Jun 13, 2011 at 9:49 AM, John Beales <johnb...@gmail.com> wrote:

Will do. Thanks.