Backport pixman replacement

[uli42]

commit 047bf3349bb697c73c95729a8bbf15f72605901f
Author: Soren Sandmann Pedersen ssp@dhcp83-218.boston.redhat.com
Date: Wed May 23 16:56:05 2007 -0400

Delete trapezoid rendering code; replace with pixman calls

[sunweaver]

While on it...

commit 9cbcb5bd6a5360a128d15b77a02d8d3351f74366
Author: Søren Sandmann Pedersen <ssp@redhat.com>
Date:   Wed May 30 05:19:08 2012 -0400

    Use new pixman_glyph_cache_t API that will be in pixman 0.28.0
    
    This new API allows glyphs to be cached in a data structure in pixman,
    and entire glyph strings to be composited in one go.
    
    Also bump pixman dependency to 0.27.2.
    
    Results from the cairo peformance test suite running against Xvfb with
    a screen size of 1680x1050@32bpp:
    
    Speedups
    ========
     xlib          firefox-talos-gfx  12416.63 -> 3603.93   3.45x speedup
    ██▌
     xlib          xfce4-terminal-a1   1727.57 -> 1048.85:  1.65x speedup
    ▋
     xlib                  evolution   1370.49 -> 869.34:   1.58x speedup
    ▋
     xlib         gnome-terminal-vim   1832.83 -> 1251.94:  1.46x speedup
    ▌
     xlib                    poppler   1519.70 -> 1204.05:  1.26x speedup
    ▎
     xlib       firefox-planet-gnome   6982.55 -> 5598.16:  1.25x speedup
    ▎
     xlib                  ocitysmap   1142.77 -> 1071.53:  1.07x speedup
    ▏
    
    No slowdowns were reported.
    
    Results of x11perf -aa10text:
    
    Before:
    
          8000000 reps @   0.0007 msec (1450000.0/sec)
          8000000 reps @   0.0007 msec (1460000.0/sec)
          8000000 reps @   0.0007 msec (1460000.0/sec)
          8000000 reps @   0.0007 msec (1470000.0/sec)
          8000000 reps @   0.0007 msec (1480000.0/sec)
         40000000 trep @   0.0007 msec (1460000.0/sec)
    
    After:
    
         32000000 reps @   0.0002 msec (4910000.0/sec)
         32000000 reps @   0.0002 msec (4830000.0/sec)
         32000000 reps @   0.0002 msec (4890000.0/sec)
         32000000 reps @   0.0002 msec (4830000.0/sec)
         32000000 reps @   0.0002 msec (4900000.0/sec)
        160000000 trep @   0.0002 msec (4870000.0/sec)
    
    Version 2: Destroy the glyph cache at server regen time
    
    Acked-by: Aaron Plattner <aplattner@nvidia.com>
    Reviewed-by: Keith Packard <keithp@keithp.com>
    Signed-off-by: Soren Sandmann <ssp@redhat.com>

[Hybrid512]

Would be nice to have same tests with Google Chrome or Chromium

[uli42]

Before doing the above we first need to backport this:

commit 9d87ef4e0dff40ea39f1b209c67b90079fc79065
Author: Soren Sandmann Pedersen <ssp@dhcp83-218.boston.redhat.com>
Date:   Wed May 23 15:50:25 2007 -0400

    - Make image_from_pict() non-static
    - Delete fbedge.c and fbedgeimp.h
    - Use pixman_rasterize_edges() in fbtrap.c