The original "slim" symbol rewriting was added without any shred of a
set of performance evaluation, and mostly copy-pasted from a very early
version of pixman. Pixman itself never used them, and most C
libraries—like GLib and GTK—have dropped similar mechanisms over the
past 15 years, as linkers have improved considerably in the meantime.
Modern linkers provide functionality to avoid intra-library PLT jump
through flags like `-Bsymbolic-functions`; we should use that, instead,
and keep the code base more maintainable and debuggable.
Having spent the last dev cycle looking at how we could specialize the
compositors for various backends, we once again look for the
commonalities in order to reduce the duplication. In part this is
motivated by the idea that spans is a good interface for both the
existent GL backend and pixman, and so they deserve a dedicated
compositor. xcb/xlib target an identical rendering system and so they
should be using the same compositor, and it should be possible to run
that same compositor locally against pixman to generate reference tests.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
P.S. This brings massive upheaval (read breakage) I've tried delaying in
order to fix as many things as possible but now this one patch does far,
far, far too much. Apologies in advance for breaking your favourite
backend, but trust me in that the end result will be much better. :)
make check fails because cairo-script-private.h cannot be compiled
standalone:
./cairo-script-private.h:45:1: error: unknown type name ‘cairo_private’
...
./cairo-script-private.h:48:40: error: unknown type name ‘cairo_output_stream_t’
The immediate use of this is to print out the slowest operation of each
type in a replayable manner. A continuing demonstration of how we may
analyse traces...
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
