[PATCH v8 7/7] winex11.drv: Don't react to small slow mouse movements.

[Derek Lesho]

From: Jordan Galby <gravemind2a+wine at gmail.com>

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=42631
From: Jordan Galby <gravemind2a+wine at gmail.com>
Signed-off-by: Derek Lesho <dereklesho52 at Gmail.com>
---
 dlls/winex11.drv/mouse.c  | 63 +++++++++++++++++++++++++++++----------
 dlls/winex11.drv/x11drv.h |  1 +
 2 files changed, 48 insertions(+), 16 deletions(-)

diff --git a/dlls/winex11.drv/mouse.c b/dlls/winex11.drv/mouse.c
index f328eb369c..77054618de 100644
--- a/dlls/winex11.drv/mouse.c
+++ b/dlls/winex11.drv/mouse.c
@@ -257,6 +257,8 @@ static void update_relative_valuators(XIAnyClassInfo **valuators, int n_valuator
 
     thread_data->x_rel_valuator.number = -1;
     thread_data->y_rel_valuator.number = -1;
+    thread_data->x_rel_valuator.accum = 0;
+    thread_data->y_rel_valuator.accum = 0;
 
     for (i = 0; i < n_valuators; i++)
     {
@@ -1733,6 +1735,7 @@ static BOOL X11DRV_RawMotion( XGenericEventCookie *xev )
     double dx = 0, dy = 0, raw_dx = 0, raw_dy = 0, val, raw_val;
     struct x11drv_thread_data *thread_data = x11drv_thread_data();
     struct x11drv_valuator_data *x_rel, *y_rel;
+    static double raw_accum_x = 0, raw_accum_y = 0;
 
     if (thread_data->x_rel_valuator.number < 0 || thread_data->y_rel_valuator.number < 0) return FALSE;
     if (!event->valuators.mask_len) return FALSE;
@@ -1746,15 +1749,11 @@ static BOOL X11DRV_RawMotion( XGenericEventCookie *xev )
     input.u.mi.dwFlags     = MOUSEEVENTF_MOVE;
     input.u.mi.time        = EVENT_x11_time_to_win32_time( event->time );
     input.u.mi.dwExtraInfo = 0;
-    input.u.mi.dx = 0;
-    input.u.mi.dy = 0;
 
     raw_input.header.dwType = RIM_TYPEMOUSE;
     raw_input.data.mouse.u.usButtonFlags = 0;
     raw_input.data.mouse.u.usButtonData = 0;
     raw_input.data.mouse.ulExtraInformation = 0;
-    raw_input.data.mouse.lLastX = 0;
-    raw_input.data.mouse.lLastY = 0;
 
     virtual_rect = get_virtual_screen_rect();
 
@@ -1765,38 +1764,70 @@ static BOOL X11DRV_RawMotion( XGenericEventCookie *xev )
         raw_val = *raw_values++;
         if (i == x_rel->number)
         {
-            input.u.mi.dx = dx = val;
+            dx = val;
             if (x_rel->min < x_rel->max)
-                input.u.mi.dx = val * (virtual_rect.right - virtual_rect.left)
+                dx = val * (virtual_rect.right - virtual_rect.left)
                                     / (x_rel->max - x_rel->min);
 
-            raw_input.data.mouse.lLastX = raw_dx = raw_val;
+            raw_dx = raw_val;
         }
         if (i == y_rel->number)
         {
-            input.u.mi.dy = dy = val;
+            dy = val;
             if (y_rel->min < y_rel->max)
-                input.u.mi.dy = val * (virtual_rect.bottom - virtual_rect.top)
+                dy = val * (virtual_rect.bottom - virtual_rect.top)
                                     / (y_rel->max - y_rel->min);
 
-            raw_input.data.mouse.lLastY = raw_dy = raw_val;
+            raw_dy = raw_val;
         }
     }
 
     if (broken_rawevents && is_old_motion_event( xev->serial ))
     {
-        TRACE( "pos %d,%d old serial %lu, ignoring\n", input.u.mi.dx, input.u.mi.dy, xev->serial );
+        TRACE( "pos %d,%d old serial %lu, ignoring\n", (LONG) dx, (LONG) dy, xev->serial );
         return FALSE;
     }
 
-    if (thread_data->xi2_state == xi_extra)
+    /* Accumulate the *double* motions so sub-pixel motions
+     * wont be lost when sent/cast to *LONG* target fields.
+     */
+
+    x_rel->accum += dx;
+    y_rel->accum += dy;
+    if (fabs(x_rel->accum) < 1.0 && fabs(y_rel->accum) < 1.0)
     {
-        TRACE( "pos %d,%d (event %f,%f)\n", input.u.mi.dx, input.u.mi.dy, dx, dy );
-        __wine_send_input( 0, &input );
+        TRACE( "accumulating raw motion (event %f,%f, accum %f,%f)\n", dx, dy, x_rel->accum, y_rel->accum );
     }
+    else
+    {
+        input.u.mi.dx = x_rel->accum;
+        input.u.mi.dy = y_rel->accum;
+        x_rel->accum -= input.u.mi.dx;
+        y_rel->accum -= input.u.mi.dy;
 
-    TRACE("raw event %f,%f\n",  raw_dx, raw_dy);
-    __wine_send_raw_input( &raw_input );
+        if (thread_data->xi2_state == xi_extra)
+        {
+            TRACE( "pos %d,%d (event %f,%f)\n", input.u.mi.dx, input.u.mi.dy, dx, dy );
+            __wine_send_input( 0, &input );
+        }
+    }
+
+    raw_accum_x += raw_dx;
+    raw_accum_y += raw_dy;
+    if (fabs(raw_accum_x) < 1.0 && fabs(raw_accum_y) < 1.0)
+    {
+        TRACE( "accumulating raw motion (event %f,%f, accum %f,%f)\n", raw_dx, raw_dy, raw_accum_x, raw_accum_y );
+    }
+    else
+    {
+        raw_input.data.mouse.lLastX = raw_accum_x;
+        raw_input.data.mouse.lLastY = raw_accum_y;
+        raw_accum_x -= raw_input.data.mouse.lLastX;
+        raw_accum_y -= raw_input.data.mouse.lLastY;
+
+        TRACE("raw event %d,%d(event %f,%f)\n", raw_input.data.mouse.lLastX, raw_input.data.mouse.lLastY, raw_dx, raw_dy);
+        __wine_send_raw_input( &raw_input );
+    }
 
     return TRUE;
 }
diff --git a/dlls/winex11.drv/x11drv.h b/dlls/winex11.drv/x11drv.h
index a6d64f4383..7dfc06bcd2 100644
--- a/dlls/winex11.drv/x11drv.h
+++ b/dlls/winex11.drv/x11drv.h
@@ -320,6 +320,7 @@ struct x11drv_valuator_data
     double min;
     double max;
     int number;
+    double accum;
 };
 
 struct x11drv_thread_data
-- 
2.22.0