Proposal: Revive Async Drawing API

Josh Aas josh at
Mon Nov 30 22:38:23 UTC 2015

LGTM, will work with David to get a patch pushed to the npapi-sdk repo.

On Tue, Nov 17, 2015 at 6:32 PM, Robert O'Callahan <robert at> wrote:
> On Wed, Nov 18, 2015 at 10:30 AM, David Anderson <danderson at>
> wrote:
>> In 2012, an API for hardware-accelerated, windowless drawing was proposed
>> and accepted [1]. Flash used this API in beta but it never went to release,
>> and the API was thus retracted in early 2014.
>> This code was never removed from Flash, and builds from Adobe with it
>> re-enabled still work as intended. This is a huge performance boon to
>> windowless plugins, and it removes one of the remaining use cases for
>> windowed plugins. We would like to move forward with the API again.
>> I have made two changes to the original documentation:
>>  (1) NPN_SetCurrentAsyncSurface() must be called from the main thread,
>> rather than any thread. This simplifies its implementation in browsers, and
>> matches the behavior already implemented in Flash.
>>  (2) A new NPNVariable, NPNVpreferredDXGIAdapter. This allows Flash to
>> negotiate the correct GPU with Firefox, a problem not originally anticipated
>> since dual GPUs were not popular when this API was first made.
>> Proposed SDK changes [2] and sample plugin with both drawing models [3]
>> are available.
> That sounds very good!
> Rob
> --
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Josh Aas
Senior Technology Strategist
Mozilla Corporation

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