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evdev: add helper function to normalize delta coordinates

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No functional changes.

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 2015-03-09 15:51:12 +10:00
parent abdd86a4c4
commit 9f8edc5fd8
1 changed files with 10 additions and 4 deletions
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14
src/evdev.c
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@ -224,6 +224,13 @@ evdev_device_transform_y(struct evdev_device *device,
return scale_axis(device->abs.absinfo_y, y, height);
}
static inline void
normalize_delta(struct evdev_device *device, double *dx, double *dy)
{
*dx = *dx * (double)device->dpi / DEFAULT_MOUSE_DPI;
*dy = *dy * (double)device->dpi / DEFAULT_MOUSE_DPI;
}
static void
evdev_flush_pending_event(struct evdev_device *device, uint64_t time)
{
@ -243,10 +250,9 @@ evdev_flush_pending_event(struct evdev_device *device, uint64_t time)
case EVDEV_NONE:
return;
case EVDEV_RELATIVE_MOTION:
dx_unaccel = device->rel.dx / ((double) device->dpi /
DEFAULT_MOUSE_DPI);
dy_unaccel = device->rel.dy / ((double) device->dpi /
DEFAULT_MOUSE_DPI);
dx_unaccel = device->rel.dx;
dy_unaccel = device->rel.dy;
normalize_delta(device, &dx_unaccel, &dy_unaccel);
device->rel.dx = 0;
device->rel.dy = 0;