[Bf-blender-cvs] [215734bc522] master: Fix T88386: Continuous Grab occasionally jumping on Arm64 MacOS

[Germano Cavalcante]

Commit: 215734bc522a8db532a626f460b85b66b0aa0a4c
Author: Germano Cavalcante
Date:   Wed Aug 11 23:28:34 2021 -0300
Branches: master
https://developer.blender.org/rB215734bc522a8db532a626f460b85b66b0aa0a4c

Fix T88386: Continuous Grab occasionally jumping on Arm64 MacOS

During the processing of a continuous drag event, other mouse move
events may be in the queue waiting to be processed.

But when a mouse wrapping happens, these waiting mouse move events
become out of date as they report a mouse position prior to wrapping.

The current code ignores these events by comparing their `timestamp` to
the time recorded in the last mouse wrapping.

The bug happens because the computed value in
`mach_absolute_time() * 1e-9` for some reason is incompatible with the
value of `[event timestamp]`.

Since macOS 10.6, we have a new way to get the amount of time the
system has been awake. `[[NSProcessInfo processInfo] systemUptime]`.

Using this updated method fixed the problem.

Differential Revision: https://developer.blender.org/D12202

===================================================================

M	intern/ghost/intern/GHOST_SystemCocoa.mm

===================================================================

diff --git a/intern/ghost/intern/GHOST_SystemCocoa.mm b/intern/ghost/intern/GHOST_SystemCocoa.mm
index 2b4c3237c73..933e0c70cc8 100644
--- a/intern/ghost/intern/GHOST_SystemCocoa.mm
+++ b/intern/ghost/intern/GHOST_SystemCocoa.mm
@@ -1629,7 +1629,7 @@ GHOST_TSuccess GHOST_SystemCocoa::handleMouseEvent(void *eventPtr)
                                        y_accum + (y_mouse - warped_y_mouse));
 
             /* This is the current time that matches NSEvent timestamp. */
-            m_last_warp_timestamp = mach_absolute_time() * 1e-9;
+            m_last_warp_timestamp = [[NSProcessInfo processInfo] systemUptime];
           }
 
           // Generate event