[PATCH:xmag] Use lrint() from math library if available

[Alan Coopersmith]

On 12/20/11 22:30, James Cloos wrote:
>>>>>> "AC" == Alan Coopersmith<alan.coopersmith at oracle.com>  writes:
>
> AC>  Moves -lm from being hardcoded in Makefile.am to being added via
> AC>  AC_SEARCH_LIBS in configure.ac setting it in $(LIBS)
>
> AC>  Using lrint() [returns long int] instead of rint() [returns double]
> AC>  clears a bunch of gcc warnings of the form:
> AC>  "cast from function call of type ‘double’ to non-matching type ‘short int’"
>
> AC>  Signed-off-by: Alan Coopersmith<alan.coopersmith at oracle.com>
>
> Should the call to floor(3) when lrint(3) is unavailable include a cast?

There's already casts at the call sites, though not always at the exact
same place:

         sw->scale.table.x[(int) x] = (Position) myrint(sw->scale.scale_x * x);
         sw->scale.table.width[(int) x] = (Dimension)
             myrint(sw->scale.scale_x *(x + 1)) - myrint(sw->scale.scale_x * x);

         sw->scale.table.y[(int) y] = (Position) myrint(sw->scale.scale_y * y);
         sw->scale.table.height[(int) y] = (Dimension)
             myrint(sw->scale.scale_y *(y + 1)) - myrint(sw->scale.scale_y * y);

     sw->scale.width = (Dimension)
         max(myrint(sw->scale.scale_x * sw->scale.image->width), 1);
     sw->scale.height = (Dimension)
         max(myrint(sw->scale.scale_y * sw->scale.image->height), 1);

where Dimension & Position are typedefs from <X11/Intrinsic.h>:

typedef unsigned short  Dimension;  /* Size in pixels                   */
typedef short           Position;   /* Offset from 0 coordinate         */

(so they're now casting long int to short int, instead of double to short int).

-- 
	-Alan Coopersmith-        alan.coopersmith at oracle.com
	 Oracle Solaris Platform Engineering: X Window System