[webkit-gtk] Is accelerated compositing (AC) successfully supported in webkitgtk2.4.9/webkit2 with X11 as backend?

[Huang Xinsheng]

Thanks a lot, Carlos.

The libGL.so.1 is already successfully linked to WebKitWebProcess in my build.

In webkitgtk2.4.9 ./Source/WebKit2/UIProcess/API/gtk/PageClientImpl.cpp, the following function enterAcceleratedCompositingMode  is NOT implemented.
#if USE(ACCELERATED_COMPOSITING)
void PageClientImpl::enterAcceleratedCompositingMode(const LayerTreeContext&)
{
    notImplemented();
}

So, it seems AC is still NOT fully implemented in webkitgtk2.4.9.
When I load page with “export WEBKIT_FORCE_COMPOSITING_MODE=1” or not, it both runs into this function. So, it seems AC is already on.
But, the page still shows as expected. It is strange because this function enterAcceleratedCompositingMode is NOT implemented.

Anyway, I will stop research on it, and turn to use webkitgtk2.10.7, thank you.

Best Regards
Eric


-----Original Message-----
From: webkit-gtk-bounces at lists.webkit.org [mailto:webkit-gtk-bounces at lists.webkit.org] On Behalf Of Carlos Alberto Lopez Perez
Sent: 2016年3月9日 20:51
To: webkit-gtk at lists.webkit.org
Subject: Re: [webkit-gtk] Is accelerated compositing (AC) successfully supported in webkitgtk2.4.9/webkit2 with X11 as backend?

On 09/03/16 08:47, Huang Xinsheng wrote:
> Thanks, Michael. You do help a lot.
> For MiniBrowser using webkit2, how can we forcibly using GPU in AC (if GPU is available) when running the AC case? 
> Is there any necessary code change when building webkitgtk or MiniBrowser?
> AC case: 
> https://webkit.org/blog-files/3d-transforms/poster-circle.html
>  
> Best Regards
> Eric

If you have built WebKitGTK+ with either -DENABLE_GLES2=ON (if your GPU supports OpenGL ES 2.0) or with -DENABLE_OPENGL=ON (if it supports the full OpenGL API) then it should be enabled.

To double-check, you can also check if the WebKitWebProcess binary is linked against your GL libraries. Example:

$ ldd /usr/lib/x86_64-linux-gnu/webkit2gtk-4.0/WebKitWebProcess | grep GL
	libGL.so.1 => /usr/lib/x86_64-linux-gnu/libGL.so.1 (0x00007f3208c10000)
	libEGL.so.1 => /usr/lib/x86_64-linux-gnu/libEGL.so.1 (0x00007f3208907000)


If you want to make AC to be always on and avoid entering/exiting from AC mode depending on the contents of the website you can set this environment variable before executing the browser (only works with webkitgtk+ 2.10 or newer):

export WEBKIT_FORCE_COMPOSITING_MODE=1

Note: this will not make AC work if for some reason it is not working.
It will just prevent the browser from exiting AC mode if AC is working.