include/vcl/bitmap.hxx | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
New commits:
commit f31e6debfa7e330f985a0846a6ca91130d3dab20
Author: Pedro Giffuni <p...@apache.org>
Date: Fri Feb 8 15:35:48 2013 +0000
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.
(cherry picked from commit d1f61b3f3564ca5421a13b77e4c7c78bb409e9e1)
Conflicts:
vcl/inc/vcl/bitmap.hxx
Change-Id: I5f01db1688eedee25a2943ca3aa6e957b400c759
diff --git a/include/vcl/bitmap.hxx b/include/vcl/bitmap.hxx
index bacec11..4ca9cc1 100644
--- a/include/vcl/bitmap.hxx
+++ b/include/vcl/bitmap.hxx
@@ -20,6 +20,7 @@
#ifndef _SV_BITMAP_HXX
#define _SV_BITMAP_HXX
+#include <boost/math/special_functions/sinc.hpp>
#include <tools/color.hxx>
#include <tools/link.hxx>
#include <tools/solar.h>
@@ -207,7 +208,8 @@ public:
class Lanczos3Kernel : public Kernel
{
-
+ typedef boost::math::policies::policy<
+ boost::math::policies::promote_double<false> > SincPolicy;
public:
Lanczos3Kernel() : Kernel () {}
virtual double GetWidth() const { return 3.0; }
@@ -223,7 +225,7 @@ public:
return 1.0;
}
x = x * M_PI;
- return sin(x) / x;
+ return boost::math::sinc_pi(x, SincPolicy());
}
};
_______________________________________________
Libreoffice-commits mailing list
libreoffice-comm...@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/libreoffice-commits
