[Webkit-unassigned] [Bug 159928] [GStreamer] Support a direct GPU-to-GPU copy of video textures to WebGL

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159928

--- Comment #2 from Olivier Blin <olivier.blin at softathome.com> ---
(In reply to comment #1)
> Created attachment 284029 [details]
> Patch

Posting for comments.

This patch implements copyVideoTextureToPlatformTexture() for the GStreamer media player backend, to do GPU-to-GPU copy.

This copies the VideoTextureCopierCV code from Apple backends, removing Apple specifics.

If this approach is ok, the patch should be reworked to properly extract VideoTextureCopier, by inlining the few remaining VideoTextureCopierCV specifics in MediaPlayerPrivateAVFoundationObjC.

Though, Miguel already has concerns about this, since it does not support the video rotation flags.
Miguel suggests to reuse cairo_gl_surface_create_for_texture() instead, like in nativeImageForCurrentTime(), and let cairo do the texture copy and rotating if needed.

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