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rdp: Add high precision scrolling

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Co-authored-by: Steve Pronovost <spronovo@microsoft.com>
Co-authored-by: Brenton DeGeer <brdegeer@microsoft.com>
Signed-off-by: Hideyuki Nagase <hideyukn@microsoft.com>
Signed-off-by: Steve Pronovost <spronovo@microsoft.com>
Signed-off-by: Brenton DeGeer <brdegeer@microsoft.com>
This commit is contained in:
Hideyuki Nagase 2022-03-22 11:13:46 -05:00 committed by Derek Foreman
parent ce09c7835c
commit 4e907a67e5
2 changed files with 60 additions and 17 deletions
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74
libweston/backend-rdp/rdp.c
View File

@ -1025,31 +1025,71 @@ ignore:
*button = 0;
}
static void
static bool
rdp_notify_wheel_scroll(RdpPeerContext *peerContext, UINT16 flags)
{
struct weston_pointer_axis_event weston_event;
struct rdp_backend *b = peerContext->rdpBackend;
int ivalue;
double value;
struct timespec time;
int *accumWheelRotationPrecise;
int *accumWheelRotationDiscrete;
/* DEFAULT_AXIS_STEP_DISTANCE is stolen from compositor-x11.c
* The RDP specs says the lower bits of flags contains the "the number of rotation
* units the mouse wheel was rotated".
*
* https://devblogs.microsoft.com/oldnewthing/20130123-00/?p=5473 explains the 120 value
*/
value = -(flags & 0xff) / 120.0;
/*
* The RDP specs says the lower bits of flags contains the "the number of rotation
* units the mouse wheel was rotated".
*/
ivalue = ((int)flags & 0x000000ff);
if (flags & PTR_FLAGS_WHEEL_NEGATIVE)
value = -value;
ivalue = (0xff - ivalue) * -1;
weston_event.axis = WL_POINTER_AXIS_VERTICAL_SCROLL;
weston_event.value = DEFAULT_AXIS_STEP_DISTANCE * value;
weston_event.discrete = (int)value;
weston_event.has_discrete = true;
/*
* Flip the scroll direction as the RDP direction is inverse of X/Wayland
* for vertical scroll
*/
ivalue *= -1;
weston_compositor_get_time(&time);
accumWheelRotationPrecise = &peerContext->verticalAccumWheelRotationPrecise;
accumWheelRotationDiscrete = &peerContext->verticalAccumWheelRotationDiscrete;
notify_axis(peerContext->item.seat, &time, &weston_event);
/*
* Accumulate the wheel increments.
*
* Every 12 wheel increments, we will send an update to our Wayland
* clients with an updated value for the wheel for smooth scrolling.
*
* Every 120 wheel increments, we tick one discrete wheel click.
*
* https://devblogs.microsoft.com/oldnewthing/20130123-00/?p=5473 explains the 120 value
*/
*accumWheelRotationPrecise += ivalue;
*accumWheelRotationDiscrete += ivalue;
rdp_debug_verbose(b, "wheel: rawValue:%d accumPrecise:%d accumDiscrete %d\n",
ivalue, *accumWheelRotationPrecise, *accumWheelRotationDiscrete);
if (abs(*accumWheelRotationPrecise) >= 12) {
value = (double)(*accumWheelRotationPrecise / 12);
weston_event.axis = WL_POINTER_AXIS_VERTICAL_SCROLL;
weston_event.value = value;
weston_event.discrete = *accumWheelRotationDiscrete / 120;
weston_event.has_discrete = true;
rdp_debug_verbose(b, "wheel: value:%f discrete:%d\n",
weston_event.value, weston_event.discrete);
weston_compositor_get_time(&time);
notify_axis(peerContext->item.seat, &time, &weston_event);
*accumWheelRotationPrecise %= 12;
*accumWheelRotationDiscrete %= 120;
return true;
}
return false;
}
static BOOL
@ -1095,8 +1135,8 @@ xf_mouseEvent(rdpInput *input, UINT16 flags, UINT16 x, UINT16 y)
}
if (flags & PTR_FLAGS_WHEEL) {
rdp_notify_wheel_scroll(peerContext, flags);
need_frame = true;
if (rdp_notify_wheel_scroll(peerContext, flags))
need_frame = true;
}
if (need_frame)

3
libweston/backend-rdp/rdp.h
View File

@ -112,6 +112,9 @@ struct rdp_peer_context {
struct rdp_peers_item item;
bool button_state[5];
int verticalAccumWheelRotationPrecise;
int verticalAccumWheelRotationDiscrete;
};
typedef struct rdp_peer_context RdpPeerContext;