Author: pfg
Date: Fri Feb 8 16:35:48 2013
New Revision: 1444115
URL: http://svn.apache.org/r1444115
Log:
A miscellaneous use of boost.
Sinc(x) is a simple function used in communications. boost
happens to use it for quaternion math. The implementation is
simple, however it looks fun to re-use the boost function
even if just to say we are using quaternion math somewhere ;).
The performance difference is not likely to be huge but JIC,
set up a specific Boost math policy to limit type promotion
with it's corresponding impact.
Modified:
openoffice/trunk/main/vcl/inc/vcl/bitmap.hxx
Modified: openoffice/trunk/main/vcl/inc/vcl/bitmap.hxx
URL:
http://svn.apache.org/viewvc/openoffice/trunk/main/vcl/inc/vcl/bitmap.hxx?rev=1444115&r1=1444114&r2=1444115&view=diff
==============================================================================
--- openoffice/trunk/main/vcl/inc/vcl/bitmap.hxx (original)
+++ openoffice/trunk/main/vcl/inc/vcl/bitmap.hxx Fri Feb 8 16:35:48 2013
@@ -30,6 +30,17 @@
#include <tools/rc.hxx>
#include <vcl/region.hxx>
+#ifdef WNT
+#define _STLP_HAS_NATIVE_FLOAT_ABS
+#endif
+
+#include <boost/math/special_functions/sinc.hpp>
+
+using namespace boost::math::policies;
+typedef policy<
+ promote_double<false>
+> SincPolicy;
+
// -----------
// - Defines -
// -----------
@@ -261,8 +272,7 @@ public:
}
x *= M_PI;
-
- return sin(x) / x;
+ return boost::math::sinc_pi(x, SincPolicy());
}
};
