[cairo] cairo Summer-of-code participant introduction

[Bill Spitzak]

Half is from ILM as part of their OpenEXR library. I think the actual 
part that is wanted is entirely inline in the header files. Sounds 
fairly BSD-like:

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Kai-Uwe Behrmann wrote:
> A C library implementing the 16-bit HALF float with a liberal license 
> (BSD) would be very welcome. It could be shared or used in Oyranos as 
> well.
> 
> Cairo may consider to not to rely on some particular tone mapping library 
> without a framework for flexible and language independent pluging in of 
> new operators. The Oyranos CMS is designed toward providing the later.
> 
> kind regards
> Kai-Uwe Behrmann
> 
> 
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