# HG changeset patch
# User Mike Miller <mtmiller@ieee.org>
# Date 1379717023 14400
# Node ID b76b14e386b3f4e76200c54184ae192cfe4f8383
# Parent  36877a45bd1be102922d399c4554f3db3616a1ff
Replace ambiguous call to pow with bit shift

* __magick_read__.cc (encode_uint_image<T>): Replace ambiguous call to pow
with bit shift for computing integer powers of two.

diff -r 36877a45bd1b -r b76b14e386b3 libinterp/dldfcn/__magick_read__.cc
--- a/libinterp/dldfcn/__magick_read__.cc	Fri Sep 20 23:37:51 2013 +0200
+++ b/libinterp/dldfcn/__magick_read__.cc	Fri Sep 20 18:43:43 2013 -0400
@@ -27,8 +27,6 @@
 #include <config.h>
 #endif
 
-#include <cmath>
-
 #include "file-stat.h"
 #include "oct-env.h"
 #include "oct-time.h"
@@ -1035,7 +1033,7 @@
   // From GM documentation:
   //  Color arguments are must be scaled to fit the Quantum size according to
   //  the range of MaxRGB
-  const double divisor = (pow (2, bitdepth) - 1) / MaxRGB;
+  const double divisor = static_cast<double>((1 << bitdepth) - 1) / MaxRGB;
 
   const P *img_fvec = img.fortran_vec ();
   const P *a_fvec   = alpha.fortran_vec ();