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Add device_float_get_direction

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With some upcoming changes we need this function for device float coordinates
as well.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Peter Hutterer 2016-12-15 09:26:42 +10:00
parent db9cfc9c5c
commit 187c38f660
1 changed files with 26 additions and 11 deletions
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37
src/libinput-private.h
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@ -701,28 +701,28 @@ enum directions {
}; };
static inline uint32_t static inline uint32_t
normalized_get_direction(struct normalized_coords norm) xy_get_direction(double x, double y)
{ {
uint32_t dir = UNDEFINED_DIRECTION; uint32_t dir = UNDEFINED_DIRECTION;
int d1, d2; int d1, d2;
double r; double r;
if (fabs(norm.x) < 2.0 && fabs(norm.y) < 2.0) { if (fabs(x) < 2.0 && fabs(y) < 2.0) {
if (norm.x > 0.0 && norm.y > 0.0) if (x > 0.0 && y > 0.0)
dir = S | SE | E; dir = S | SE | E;
else if (norm.x > 0.0 && norm.y < 0.0) else if (x > 0.0 && y < 0.0)
dir = N | NE | E; dir = N | NE | E;
else if (norm.x < 0.0 && norm.y > 0.0) else if (x < 0.0 && y > 0.0)
dir = S | SW | W; dir = S | SW | W;
else if (norm.x < 0.0 && norm.y < 0.0) else if (x < 0.0 && y < 0.0)
dir = N | NW | W; dir = N | NW | W;
else if (norm.x > 0.0) else if (x > 0.0)
dir = NE | E | SE; dir = NE | E | SE;
else if (norm.x < 0.0) else if (x < 0.0)
dir = NW | W | SW; dir = NW | W | SW;
else if (norm.y > 0.0) else if (y > 0.0)
dir = SE | S | SW; dir = SE | S | SW;
else if (norm.y < 0.0) else if (y < 0.0)
dir = NE | N | NW; dir = NE | N | NW;
} else { } else {
/* Calculate r within the interval [0 to 8) /* Calculate r within the interval [0 to 8)
@ -731,7 +731,7 @@ normalized_get_direction(struct normalized_coords norm)
* d_f = r / 2π ([0 .. 1)) * d_f = r / 2π ([0 .. 1))
* d_8 = 8 * d_f * d_8 = 8 * d_f
*/ */
r = atan2(norm.y, norm.x); r = atan2(y, x);
r = fmod(r + 2.5*M_PI, 2*M_PI); r = fmod(r + 2.5*M_PI, 2*M_PI);
r *= 4*M_1_PI; r *= 4*M_1_PI;
@ -745,4 +745,19 @@ normalized_get_direction(struct normalized_coords norm)
return dir; return dir;
} }
static inline uint32_t
normalized_get_direction(struct normalized_coords norm)
{
return xy_get_direction(norm.x, norm.y);
}
/**
* Get the direction for the given set of coordinates.
* assumption: coordinates are normalized to one axis resolution.
*/
static inline uint32_t
device_float_get_direction(struct device_float_coords coords)
{
return xy_get_direction(coords.x, coords.y);
}
#endif /* LIBINPUT_PRIVATE_H */ #endif /* LIBINPUT_PRIVATE_H */