[cairo] [patch] XCopyArea fast path

[graydon hoare]

hi,

this patch adds a fast path to the xlib backend to call XCopyArea when 
it detects a "surface showing" operation with no mask and a SRC 
compositing operator. this is handy when doing double buffered drawing 
with cairo, as I can have cairo composite the final "image".

to accomodate this change, two macros for reasoning about cairo fixed 
point values were moved from cairo_gstate.c to cairoint.h, and the xlib 
clipping function was augmented to set the drawable's clip as well as 
the previously-set picture clip.

ok to commit?

-graydon
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