I don't need the precise damaged region and unioned rect suffices.
I'm still considering possibilities for the triggering mechanism and have
not found a good one yet. It would be great if you suggest options that I
take a closer look at.

Thanks,
Ramin

On Mon, Jan 3, 2022 at 5:00 PM Khushal Sagar <khushalsa...@chromium.org>
wrote:

> Are you looking for the precise damaged region (list of rectangles) or
> would a unioned rect suffice? Damage tracking in the compositing stack
> tracks the latter.
>
> Also, how is the snapshot getting triggered? That'll help in pointing out
> the easiest way to get this information.
>
> On Thu, Dec 30, 2021 at 11:07 PM Ramin Halavati <rhalav...@chromium.org>
> wrote:
>
>> Hi!
>>
>> I am working on a proposal for an accessibility module that takes
>> snapshots of the screen and annotates them through a local image processing
>> module.
>>
> To do so, I need to have triggers that say "this region of the screen is
>> updated". I've looked into several positions for the trigger (like
>> ui::Window::SchedulePaintInRect oand
>> cc::AsyncLayerTreeFrameSink::SubmitCompositorFrame) but could not find a
>> place that gives me the content area rectangles that are updated. I would
>> appreciate any pointers on where to look.
>>
>> Thank you,
>> Ramin
>>
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