feat: accelerated paint

[1zun4]

CEF supports hardware-accelerated off-screen rendering by enabling shared_texture_enabled via WindowInfo and passing --off-screen-rendering-enabled --shared-texture-enabled as arguments.

• https://bitbucket.org/chromiumembedded/cef/pull-requests/734
• https://github.com/chromiumembedded/cef/blob/2c411892e273c564dfb6650dcee8fea458849178/include/cef_render_handler.h#L151-L173.

Unfortunately, Java CEF lacks bindings for OnAcceleratedPaint, meaning we cannot make use of this feature. This pull request enables this feature when turning shared_texture_enabled to true.

The changes were tested on a forked JCEF version (on Update to CEF 135.0.20+ge7de5c3+chromium-135.0.7049.85) by converting the D3D11 shared texture handle using ImportMemoryWin32HandleEXT using OpenGL's EXT_external_objects_win32 which is supported by LWJGL3.

2025-07-10_22-31-09.mp4

Fixes #506

Please "Squash And Merge" (!!!).

[sqlerrorthing]

Please "Squash And Merge" (!!!).

why this specifically? whats wrong with other merge methods

[1zun4]

Please "Squash And Merge" (!!!).

why this specifically? whats wrong with other merge methods

It bloats up the commit history, and my changes are so small that they wouldn't benefit from a traditional merge.

[magreenblatt]

Please submit PRs at https://bitbucket.org/chromiumembedded/java-cef/pull-requests/

[1zun4]

I did that: https://bitbucket.org/chromiumembedded/java-cef/pull-requests/129

[1zun4]

@magreenblatt Could you please reopen my pull request? This will also update the diff, as additional commits have been made to my fork: https://github.com/CCBlueX/java-cef/commits/upstream/feat/accelerated-paint.

--- Comment from BitBucket regarding CCBlueX@2f54801:

With the last commit, I have extended the support to all struct-types of AcceleratedPaintInfo for each platform on CEF.

With these changes, I managed to implement Accelerated Paint support on Linux for my application:

Windows remains supported.

I beg for this to be reviewed and merged in the near future. This will finally allow fast-rendering on CEF Java Apps. Thank you.

[magreenblatt]

Unfortunately I can't reopen this PR because "the upstream branch was force-pushed or recreated". Please create a new PR (you can link this PR for the description/images).

[1zun4]

I see. I will create a new one.