diff options
Diffstat (limited to 'nx-X11/lib/src/GetImage.c')
| -rw-r--r-- | nx-X11/lib/src/GetImage.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/nx-X11/lib/src/GetImage.c b/nx-X11/lib/src/GetImage.c index 96d9ce337..c6e6e633a 100644 --- a/nx-X11/lib/src/GetImage.c +++ b/nx-X11/lib/src/GetImage.c @@ -34,15 +34,24 @@ in this Software without prior written authorization from The Open Group. #define ROUNDUP(nbytes, pad) (((((nbytes) - 1) + (pad)) / (pad)) * (pad)) -static unsigned int Ones( /* HACKMEM 169 */ - unsigned long mask) +#ifdef HAVE___BUILTIN_POPCOUNTL +# define Ones __builtin_popcountl +#else +/* + * Count the number of bits set to 1 in a 32-bit word. + * Algorithm from MIT AI Lab Memo 239: "HAKMEM", ITEM 169. + * http://dspace.mit.edu/handle/1721.1/6086 + */ +static inline unsigned int +Ones(unsigned long mask) { register unsigned long y; - y = (mask >> 1) &033333333333; + y = (mask >> 1) & 033333333333; y = mask - y - ((y >>1) & 033333333333); return ((unsigned int) (((y + (y >> 3)) & 030707070707) % 077)); } +#endif XImage *XGetImage ( register Display *dpy, |