[cairo] GSoC/Add HDR image surface type to cairo/pixman update

[xie guofu]

Hi, Cairo,

The work so far is available at git://
people.freedesktop.org/home/guofu/pixman.git. It includes that
half-precision floats in C from OpenEXR project and routines that can
convert from arbitrary formats into scRGB and back in pixman-access.c.

Then I will add compositing routines in pixman-combine-float.c like
pixman-combine32.c and add some supporting code in
PIXMAN_COMPOSITE_RECT_GENERAL in pixman-compose.c. It  only adds some code
and I think I can finish it next week.
-- 
BEST WISHES!
YOURS SINCERELY,

Guofu Xie
CG Group, State Key Laboratory of Computer Science, Institute of Software,
Chinese Academy of Sciences(ISCAS)
Tel: (+86)15810330487
Email: guofu85 at gmail.com
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