what is --enable-delegated-renderer used for?

[Kevin Li]

Hi,

I'm confused with this. What is it used for?

I have checked it and found it is used to create a DelegatedCompositorOutputSurface which is inherited from CompositorOutputSurface.

In CompositorOutputSurface, it is only used in CompositorOutputSurface::SwapBuffers, which send a different msg.

But, I'm still unclear of it.

Can someone explain me why we need this in high level?

Thanks

[Antoine Labour]

Delegated renderer, AKA Übercompositor makes the renderer process skip its compositing pass, and instead sends a series of quads (high-level drawing commands) to the browser process, so that it can merge it with its own compositing pass, saving one full pass, reducing the GPU fill rate.

You'll see that the compositor in the renderer process uses a different output - DelegatingRenderer instead of GLRenderer - and, as you discovered, will send a different message (also sends it to the browser instead of the GPU process). On the browser side, the RenderWidgetHostView* will crete a different type of layer (DelegatedRendererLayer instead of TextureLayer).

Antoine

[Antoine Labour]

On Tue, Nov 5, 2013 at 9:10 PM, Rohan Del <zakoide...@gmail.com> wrote:

So is delegated renderer used in android by default?

Not currently. https://code.google.com/p/chromium/issues/detail?id=208551 has the list of issues blocking turning this on by default.

Antoine

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[Rohan Del]

I also observed that stream texture factory android class is a new approach used only for android. Why is it necessary??

[Daniel Sievers]

On Tuesday, November 5, 2013 10:38:29 PM UTC-8, StarDust wrote:

I also observed that stream texture factory android class is a new approach used only for android. Why is it necessary??

It's the support for drawing Android SurfaceTextures in the chromium gpu stack. It's used with WebMediaPlayerAndroid and cc to composite hardware-decoded video content.