FGFS-4.1/OpenSceneGraph
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Simplified swap bytes code to make it more efficient.

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This commit is contained in:
Robert Osfield 2006-08-24 20:15:32 +00:00
parent 1413eea52c
commit 49e7607fa0
1 changed files with 15 additions and 24 deletions
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39
include/osg/Endian
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@ -42,46 +42,37 @@ inline void swapBytes( char* in, unsigned int size )
{
std::swap(*start++,*end--);
}
}
inline void swapBytes2( char* in )
{
char* start = in;
char* end = start+1;
std::swap(*start,*end);
std::swap(in[0],in[1]);
}
inline void swapBytes4( char* in )
{
char* start = in;
char* end = start+3;
std::swap(*start++,*end--);
std::swap(*start,*end);
std::swap(in[0],in[3]);
std::swap(in[1],in[2]);
}
inline void swapBytes8( char* in )
{
char* start = in;
char* end = start+7;
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start,*end);
std::swap(in[0],in[7]);
std::swap(in[1],in[6]);
std::swap(in[2],in[5]);
std::swap(in[3],in[4]);
}
inline void swapBytes16( char* in )
{
char* start = in;
char* end = start+15;
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start++,*end--);
std::swap(*start,*end);
std::swap(in[0],in[15]);
std::swap(in[1],in[14]);
std::swap(in[2],in[13]);
std::swap(in[3],in[12]);
std::swap(in[4],in[11]);
std::swap(in[5],in[10]);
std::swap(in[6],in[9]);
std::swap(in[7],in[8]);
}
}