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dix: use single return statement in DoGetDirection

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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>
Reviewed-by: Jamey Sharp <jamey@minilop.net>
Reviewed-by: Simon Thum <simon.thum@gmx.de>
This commit is contained in:
Peter Hutterer 2011-04-21 13:58:55 +10:00
parent 5f8edbe47e
commit 62f4bef82d
1 changed files with 49 additions and 42 deletions
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91
dix/ptrveloc.c
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@ -453,54 +453,61 @@ enum directions {
*/
static int
DoGetDirection(int dx, int dy){
float r;
int i1, i2;
int dir = 0;
/* on insignificant mickeys, flag 135 degrees */
if(abs(dx) < 2 && abs(dy) < 2){
/* first check diagonal cases */
if(dx > 0 && dy > 0)
return E | SE | S;
if(dx > 0 && dy < 0)
return N | NE | E;
if(dx < 0 && dy < 0)
return W | NW | N;
if(dx < 0 && dy > 0)
return W | SW | S;
/* first check diagonal cases */
if(dx > 0 && dy > 0)
dir = E | SE | S;
else if(dx > 0 && dy < 0)
dir = N | NE | E;
else if(dx < 0 && dy < 0)
dir = W | NW | N;
else if(dx < 0 && dy > 0)
dir = W | SW | S;
/* check axis-aligned directions */
if(dx > 0)
return NE | E | SE;
if(dx < 0)
return NW | W | SW;
if(dy > 0)
return SE | S | SW;
if(dy < 0)
return NE | N | NW;
return UNDEFINED; /* shouldn't happen */
}
/* else, compute angle and set appropriate flags */
else if(dx > 0)
dir = NE | E | SE;
else if(dx < 0)
dir = NW | W | SW;
else if(dy > 0)
dir = SE | S | SW;
else if(dy < 0)
dir = NE | N | NW;
else
dir = UNDEFINED; /* shouldn't happen */
} else { /* compute angle and set appropriate flags */
float r;
int i1, i2;
#ifdef _ISOC99_SOURCE
r = atan2f(dy, dx);
r = atan2f(dy, dx);
#else
r = atan2(dy, dx);
r = atan2(dy, dx);
#endif
/* find direction.
*
* Add 360° to avoid r become negative since C has no well-defined
* modulo for such cases. Then divide by 45° to get the octant number,
* e.g. 0 <= r <= 1 is [0-45]°
* 1 <= r <= 2 is [45-90]°
* etc.
* But we add extra 90° to match up with our N, S, etc. defines up
* there, rest stays the same.
*/
r = (r+(M_PI*2.5))/(M_PI/4);
/* this intends to flag 2 directions (45 degrees each),
* except on very well-aligned mickeys. */
i1 = (int)(r+0.1) % 8;
i2 = (int)(r+0.9) % 8;
if(i1 < 0 || i1 > 7 || i2 < 0 || i2 > 7)
return UNDEFINED; /* shouldn't happen */
return 1 << i1 | 1 << i2;
/* find direction.
*
* Add 360° to avoid r become negative since C has no well-defined
* modulo for such cases. Then divide by 45° to get the octant
* number, e.g.
* 0 <= r <= 1 is [0-45]°
* 1 <= r <= 2 is [45-90]°
* etc.
* But we add extra 90° to match up with our N, S, etc. defines up
* there, rest stays the same.
*/
r = (r+(M_PI*2.5))/(M_PI/4);
/* this intends to flag 2 directions (45 degrees),
* except on very well-aligned mickeys. */
i1 = (int)(r+0.1) % 8;
i2 = (int)(r+0.9) % 8;
if(i1 < 0 || i1 > 7 || i2 < 0 || i2 > 7)
dir = UNDEFINED; /* shouldn't happen */
else
dir = (1 << i1 | 1 << i2);
}
return dir;
}
#define DIRECTION_CACHE_RANGE 5