Hello list I'm having problems recording the desktop content using the Weston compositor's built-in recording function. When I start a recording and do something that changes a lot of screen content (like zooming in on the desktop, for example), I get around 0.5 FPS. Using sysprof, I can see that ~98% of CPU is used in the function unpack_XRGB8888(). krh has told me this is caused by glReadPixels going through a slowpath. I have a Radeon HD 5770 GPU and I'm using mesa git (I've tried the mesa version in the Ubuntu 12.10 repos, and the xorg-edgers PPA, same result).
Does anyone know what the issue could be, or how to debug the problem further? Doing some debugging, it seems the call to ctx->Driver.ReadPixels() in _mesa_ReadnPixelsARB leads to _mesa_readpixels() being called in readpix.c. I'm attaching some output of gdb that will hopefully be useful. I'm also attaching the debug terminal output of running Weston with the DRM backend. Let me know if I can provide other useful information.
weston-mesa.log
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gdb-mesa.log
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