Enabling GPU Paint

[aero]

How do enable Chromium/CEF to compose the UI using the GPU AKA using OnAcceleratedPaint rather than OnPaint?

Things I've tried:
CefSettings: windowless_rendering_enabled
CefWindowInfo: windowless_rendering_enabled, shared_texture_enabled, external_begin_frame_enabled

I've also tried the following command line switches:
off-screen-rendering-enabled
shared-texture-enabled
enable-gpu

Every time I go to run, render_handler_cpptoc.cc is calling render_handler_on_paint calling OnPaint... how do I get it to call render_handler_on_accelerated_paint OnAcceleratedPaint?
Did I miss a setting or do I need to extend some an additional interface in CefRenderHandler or others? My code seemed to be fine with older versions of CEF.

I hope the solution isn't use PR "Reimplement shared texture support for viz OSR"

[amaitland]

Not currently implemented.

You'll need to build a custom version from source and apply https://bitbucket.org/chromiumembedded/ ... quests/285

[aero]

I was afraid of that. Are there any binaries of this branch? Chromium seems difficult to build. Any ETA for merge other than 'when its done'?
Also was there a point in which this feature was working in the main branch?

[amaitland]

No official binaries, maybe someone who's comment on the PR can help.

No idea if/when it'll be merged. Not up to me.

I don't remember the last version to include support, you'll have to review the links and comments to find which was the last version to include. There is no support for older branches so it's not something I'd recommend.

[aero]

A bit confused here..
I see the following stack trace in cefclient with --off-screen-rendering-enabled:

OsrRenderer::Render (also OsrRenderer::OnPaint)
OsrRenderHandlerWinGL::OnPaint
OsrWindowWin::OnPaint
ClientHandlerOsr::OnPaint
render_handler_cpptoc.c : render_handler_on_paint

OsrRenderHandlerWinGL::OnPaint has a parameter const void* buffer. This OnPaint calls OsrRenderer renderer_ .OnPaint() and .Render()

In OsrRenderer::OnPaint OsrRenderer::Render() I see OGL calls.

Is this not GPU painting? How is it different from OnAccerlatedPaint?
Is buffer not the texture buffer? Can't I use this for my own Present?
Who is calling Present once this UI painting is done?

[amaitland]

OnPaint the buffer contains a bitmap.