[cairo] Regression in long random polyline rendering time

[Emmanuel Pacaud]

Hi,

Please find attached a sample program that shows a regression in current
cairo when rendering a long random polyline.

gcc `pkg-config --cflags cairo` `pkg-config --libs cairo` polyline.c -o polyline

Launch it with ./polyline n_iter

Here are the rough timing results I obtain:

n_iterations cairo-1.8.8 cairo master
10 0.007 s 0.009 s
100 0.012 s 0.015 s
1000 0.041 s 0.335 s
10000 0.302 s 27.105 s

Emmanuel.
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